diff --git a/lib/amd/build/adapter.min.js b/lib/amd/build/adapter.min.js
index 2d588c1efa7..ebf752a54d3 100644
--- a/lib/amd/build/adapter.min.js
+++ b/lib/amd/build/adapter.min.js
@@ -1,2 +1,2 @@
-function _typeof(e){if("function"==typeof Symbol&&"symbol"==typeof Symbol.iterator){_typeof=function(e){return typeof e}}else{_typeof=function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e}}return _typeof(e)}define ("core/adapter",[],function(){return function c(d,e,t){function r(i,o){if(!e[i]){if(!d[i]){var s="function"==typeof require&&require;if(!o&&s)return s(i,!0);if(n)return n(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=e[i]={exports:{}};d[i][0].call(p.exports,function(t){var e=d[i][1][t];return r(e?e:t)},p,p.exports,c,d,e,t)}return e[i].exports}for(var n="function"==typeof require&&require,a=0;a<t.length;a++){r(t[a])}return r}({1:[function(e,t){'use strict';var d=e("sdp");function r(e){return{inboundrtp:"inbound-rtp",outboundrtp:"outbound-rtp",candidatepair:"candidate-pair",localcandidate:"local-candidate",remotecandidate:"remote-candidate"}[e.type]||e.type}function a(e,t,r,a,n){var i=d.writeRtpDescription(e.kind,t);i+=d.writeIceParameters(e.iceGatherer.getLocalParameters());i+=d.writeDtlsParameters(e.dtlsTransport.getLocalParameters(),"offer"===r?"actpass":n||"active");i+="a=mid:"+e.mid+"\r\n";if(e.rtpSender&&e.rtpReceiver){i+="a=sendrecv\r\n"}else if(e.rtpSender){i+="a=sendonly\r\n"}else if(e.rtpReceiver){i+="a=recvonly\r\n"}else{i+="a=inactive\r\n"}if(e.rtpSender){var o=e.rtpSender._initialTrackId||e.rtpSender.track.id;e.rtpSender._initialTrackId=o;var s="msid:"+(a?a.id:"-")+" "+o+"\r\n";i+="a="+s;i+="a=ssrc:"+e.sendEncodingParameters[0].ssrc+" "+s;if(e.sendEncodingParameters[0].rtx){i+="a=ssrc:"+e.sendEncodingParameters[0].rtx.ssrc+" "+s;i+="a=ssrc-group:FID "+e.sendEncodingParameters[0].ssrc+" "+e.sendEncodingParameters[0].rtx.ssrc+"\r\n"}}i+="a=ssrc:"+e.sendEncodingParameters[0].ssrc+" cname:"+d.localCName+"\r\n";if(e.rtpSender&&e.sendEncodingParameters[0].rtx){i+="a=ssrc:"+e.sendEncodingParameters[0].rtx.ssrc+" cname:"+d.localCName+"\r\n"}return i}function n(e,t){var r=!1;e=JSON.parse(JSON.stringify(e));return e.filter(function(e){if(e&&(e.urls||e.url)){var a=e.urls||e.url;if(e.url&&!e.urls){console.warn("RTCIceServer.url is deprecated! Use urls instead.")}var n="string"==typeof a;if(n){a=[a]}a=a.filter(function(e){var a=0===e.indexOf("turn:")&&-1!==e.indexOf("transport=udp")&&-1===e.indexOf("turn:[")&&!r;if(a){r=!0;return!0}return 0===e.indexOf("stun:")&&14393<=t&&-1===e.indexOf("?transport=udp")});delete e.url;e.urls=n?a[0]:a;return!!a.length}})}function i(e,t){var r={codecs:[],headerExtensions:[],fecMechanisms:[]},a=function(e,t){e=parseInt(e,10);for(var r=0;r<t.length;r++){if(t[r].payloadType===e||t[r].preferredPayloadType===e){return t[r]}}},n=function(e,t,r,n){var i=a(e.parameters.apt,r),o=a(t.parameters.apt,n);return i&&o&&i.name.toLowerCase()===o.name.toLowerCase()};e.codecs.forEach(function(a){for(var o=0,s;o<t.codecs.length;o++){s=t.codecs[o];if(a.name.toLowerCase()===s.name.toLowerCase()&&a.clockRate===s.clockRate){if("rtx"===a.name.toLowerCase()&&a.parameters&&s.parameters.apt){if(!n(a,s,e.codecs,t.codecs)){continue}}s=JSON.parse(JSON.stringify(s));s.numChannels=Math.min(a.numChannels,s.numChannels);r.codecs.push(s);s.rtcpFeedback=s.rtcpFeedback.filter(function(e){for(var t=0;t<a.rtcpFeedback.length;t++){if(a.rtcpFeedback[t].type===e.type&&a.rtcpFeedback[t].parameter===e.parameter){return!0}}return!1});break}}});e.headerExtensions.forEach(function(e){for(var a=0,n;a<t.headerExtensions.length;a++){n=t.headerExtensions[a];if(e.uri===n.uri){r.headerExtensions.push(n);break}}});return r}function o(e,t,r){return-1!=={offer:{setLocalDescription:["stable","have-local-offer"],setRemoteDescription:["stable","have-remote-offer"]},answer:{setLocalDescription:["have-remote-offer","have-local-pranswer"],setRemoteDescription:["have-local-offer","have-remote-pranswer"]}}[t][e].indexOf(r)}function s(e,t){var r=e.getRemoteCandidates().find(function(e){return t.foundation===e.foundation&&t.ip===e.ip&&t.port===e.port&&t.priority===e.priority&&t.protocol===e.protocol&&t.type===e.type});if(!r){e.addRemoteCandidate(t)}return!r}function c(t,r){var a=new Error(r);a.name=t;a.code={NotSupportedError:9,InvalidStateError:11,InvalidAccessError:15,TypeError:void 0,OperationError:void 0}[t];return a}t.exports=function(e,t){function p(t,r){r.addTrack(t);r.dispatchEvent(new e.MediaStreamTrackEvent("addtrack",{track:t}))}function m(t,r){r.removeTrack(t);r.dispatchEvent(new e.MediaStreamTrackEvent("removetrack",{track:t}))}function l(t,r,a,n){var i=new Event("track");i.track=r;i.receiver=a;i.transceiver={receiver:a};i.streams=n;e.setTimeout(function(){t._dispatchEvent("track",i)})}var g=function(r){var a=this,o=document.createDocumentFragment();["addEventListener","removeEventListener","dispatchEvent"].forEach(function(e){a[e]=o[e].bind(o)});this.canTrickleIceCandidates=null;this.needNegotiation=!1;this.localStreams=[];this.remoteStreams=[];this._localDescription=null;this._remoteDescription=null;this.signalingState="stable";this.iceConnectionState="new";this.connectionState="new";this.iceGatheringState="new";r=JSON.parse(JSON.stringify(r||{}));this.usingBundle="max-bundle"===r.bundlePolicy;if("negotiate"===r.rtcpMuxPolicy){throw c("NotSupportedError","rtcpMuxPolicy 'negotiate' is not supported")}else if(!r.rtcpMuxPolicy){r.rtcpMuxPolicy="require"}switch(r.iceTransportPolicy){case"all":case"relay":break;default:r.iceTransportPolicy="all";break;}switch(r.bundlePolicy){case"balanced":case"max-compat":case"max-bundle":break;default:r.bundlePolicy="balanced";break;}r.iceServers=n(r.iceServers||[],t);this._iceGatherers=[];if(r.iceCandidatePoolSize){for(var s=r.iceCandidatePoolSize;0<s;s--){this._iceGatherers.push(new e.RTCIceGatherer({iceServers:r.iceServers,gatherPolicy:r.iceTransportPolicy}))}}else{r.iceCandidatePoolSize=0}this._config=r;this.transceivers=[];this._sdpSessionId=d.generateSessionId();this._sdpSessionVersion=0;this._dtlsRole=void 0;this._isClosed=!1};Object.defineProperty(g.prototype,"localDescription",{configurable:!0,get:function get(){return this._localDescription}});Object.defineProperty(g.prototype,"remoteDescription",{configurable:!0,get:function get(){return this._remoteDescription}});g.prototype.onicecandidate=null;g.prototype.onaddstream=null;g.prototype.ontrack=null;g.prototype.onremovestream=null;g.prototype.onsignalingstatechange=null;g.prototype.oniceconnectionstatechange=null;g.prototype.onconnectionstatechange=null;g.prototype.onicegatheringstatechange=null;g.prototype.onnegotiationneeded=null;g.prototype.ondatachannel=null;g.prototype._dispatchEvent=function(e,t){if(this._isClosed){return}this.dispatchEvent(t);if("function"==typeof this["on"+e]){this["on"+e](t)}};g.prototype._emitGatheringStateChange=function(){var e=new Event("icegatheringstatechange");this._dispatchEvent("icegatheringstatechange",e)};g.prototype.getConfiguration=function(){return this._config};g.prototype.getLocalStreams=function(){return this.localStreams};g.prototype.getRemoteStreams=function(){return this.remoteStreams};g.prototype._createTransceiver=function(e,t){var r=0<this.transceivers.length,a={track:null,iceGatherer:null,iceTransport:null,dtlsTransport:null,localCapabilities:null,remoteCapabilities:null,rtpSender:null,rtpReceiver:null,kind:e,mid:null,sendEncodingParameters:null,recvEncodingParameters:null,stream:null,associatedRemoteMediaStreams:[],wantReceive:!0};if(this.usingBundle&&r){a.iceTransport=this.transceivers[0].iceTransport;a.dtlsTransport=this.transceivers[0].dtlsTransport}else{var n=this._createIceAndDtlsTransports();a.iceTransport=n.iceTransport;a.dtlsTransport=n.dtlsTransport}if(!t){this.transceivers.push(a)}return a};g.prototype.addTrack=function(t,r){if(this._isClosed){throw c("InvalidStateError","Attempted to call addTrack on a closed peerconnection.")}var a=this.transceivers.find(function(e){return e.track===t});if(a){throw c("InvalidAccessError","Track already exists.")}for(var n,o=0;o<this.transceivers.length;o++){if(!this.transceivers[o].track&&this.transceivers[o].kind===t.kind){n=this.transceivers[o]}}if(!n){n=this._createTransceiver(t.kind)}this._maybeFireNegotiationNeeded();if(-1===this.localStreams.indexOf(r)){this.localStreams.push(r)}n.track=t;n.stream=r;n.rtpSender=new e.RTCRtpSender(t,n.dtlsTransport);return n.rtpSender};g.prototype.addStream=function(e){var r=this;if(15025<=t){e.getTracks().forEach(function(t){r.addTrack(t,e)})}else{var a=e.clone();e.getTracks().forEach(function(e,t){var r=a.getTracks()[t];e.addEventListener("enabled",function(e){r.enabled=e.enabled})});a.getTracks().forEach(function(e){r.addTrack(e,a)})}};g.prototype.removeTrack=function(r){if(this._isClosed){throw c("InvalidStateError","Attempted to call removeTrack on a closed peerconnection.")}if(!(r instanceof e.RTCRtpSender)){throw new TypeError("Argument 1 of RTCPeerConnection.removeTrack does not implement interface RTCRtpSender.")}var a=this.transceivers.find(function(e){return e.rtpSender===r});if(!a){throw c("InvalidAccessError","Sender was not created by this connection.")}var n=a.stream;a.rtpSender.stop();a.rtpSender=null;a.track=null;a.stream=null;var i=this.transceivers.map(function(e){return e.stream});if(-1===i.indexOf(n)&&-1<this.localStreams.indexOf(n)){this.localStreams.splice(this.localStreams.indexOf(n),1)}this._maybeFireNegotiationNeeded()};g.prototype.removeStream=function(e){var t=this;e.getTracks().forEach(function(e){var r=t.getSenders().find(function(t){return t.track===e});if(r){t.removeTrack(r)}})};g.prototype.getSenders=function(){return this.transceivers.filter(function(e){return!!e.rtpSender}).map(function(e){return e.rtpSender})};g.prototype.getReceivers=function(){return this.transceivers.filter(function(e){return!!e.rtpReceiver}).map(function(e){return e.rtpReceiver})};g.prototype._createIceGatherer=function(t,r){var a=this;if(r&&0<t){return this.transceivers[0].iceGatherer}else if(this._iceGatherers.length){return this._iceGatherers.shift()}var n=new e.RTCIceGatherer({iceServers:this._config.iceServers,gatherPolicy:this._config.iceTransportPolicy});Object.defineProperty(n,"state",{value:"new",writable:!0});this.transceivers[t].bufferedCandidateEvents=[];this.transceivers[t].bufferCandidates=function(e){var r=!e.candidate||0===Object.keys(e.candidate).length;n.state=r?"completed":"gathering";if(null!==a.transceivers[t].bufferedCandidateEvents){a.transceivers[t].bufferedCandidateEvents.push(e)}};n.addEventListener("localcandidate",this.transceivers[t].bufferCandidates);return n};g.prototype._gather=function(t,r){var a=this,n=this.transceivers[r].iceGatherer;if(n.onlocalcandidate){return}var i=this.transceivers[r].bufferedCandidateEvents;this.transceivers[r].bufferedCandidateEvents=null;n.removeEventListener("localcandidate",this.transceivers[r].bufferCandidates);n.onlocalcandidate=function(e){if(a.usingBundle&&0<r){return}var i=new Event("icecandidate");i.candidate={sdpMid:t,sdpMLineIndex:r};var o=e.candidate,s=!o||0===Object.keys(o).length;if(s){if("new"===n.state||"gathering"===n.state){n.state="completed"}}else{if("new"===n.state){n.state="gathering"}o.component=1;o.ufrag=n.getLocalParameters().usernameFragment;var c=d.writeCandidate(o);i.candidate=Object.assign(i.candidate,d.parseCandidate(c));i.candidate.candidate=c;i.candidate.toJSON=function(){return{candidate:i.candidate.candidate,sdpMid:i.candidate.sdpMid,sdpMLineIndex:i.candidate.sdpMLineIndex,usernameFragment:i.candidate.usernameFragment}}}var p=d.getMediaSections(a._localDescription.sdp);if(!s){p[i.candidate.sdpMLineIndex]+="a="+i.candidate.candidate+"\r\n"}else{p[i.candidate.sdpMLineIndex]+="a=end-of-candidates\r\n"}a._localDescription.sdp=d.getDescription(a._localDescription.sdp)+p.join("");var m=a.transceivers.every(function(e){return e.iceGatherer&&"completed"===e.iceGatherer.state});if("gathering"!==a.iceGatheringState){a.iceGatheringState="gathering";a._emitGatheringStateChange()}if(!s){a._dispatchEvent("icecandidate",i)}if(m){a._dispatchEvent("icecandidate",new Event("icecandidate"));a.iceGatheringState="complete";a._emitGatheringStateChange()}};e.setTimeout(function(){i.forEach(function(t){n.onlocalcandidate(t)})},0)};g.prototype._createIceAndDtlsTransports=function(){var t=this,r=new e.RTCIceTransport(null);r.onicestatechange=function(){t._updateIceConnectionState();t._updateConnectionState()};var a=new e.RTCDtlsTransport(r);a.ondtlsstatechange=function(){t._updateConnectionState()};a.onerror=function(){Object.defineProperty(a,"state",{value:"failed",writable:!0});t._updateConnectionState()};return{iceTransport:r,dtlsTransport:a}};g.prototype._disposeIceAndDtlsTransports=function(e){var t=this.transceivers[e].iceGatherer;if(t){delete t.onlocalcandidate;delete this.transceivers[e].iceGatherer}var r=this.transceivers[e].iceTransport;if(r){delete r.onicestatechange;delete this.transceivers[e].iceTransport}var a=this.transceivers[e].dtlsTransport;if(a){delete a.ondtlsstatechange;delete a.onerror;delete this.transceivers[e].dtlsTransport}};g.prototype._transceive=function(e,r,a){var n=i(e.localCapabilities,e.remoteCapabilities);if(r&&e.rtpSender){n.encodings=e.sendEncodingParameters;n.rtcp={cname:d.localCName,compound:e.rtcpParameters.compound};if(e.recvEncodingParameters.length){n.rtcp.ssrc=e.recvEncodingParameters[0].ssrc}e.rtpSender.send(n)}if(a&&e.rtpReceiver&&0<n.codecs.length){if("video"===e.kind&&e.recvEncodingParameters&&15019>t){e.recvEncodingParameters.forEach(function(e){delete e.rtx})}if(e.recvEncodingParameters.length){n.encodings=e.recvEncodingParameters}else{n.encodings=[{}]}n.rtcp={compound:e.rtcpParameters.compound};if(e.rtcpParameters.cname){n.rtcp.cname=e.rtcpParameters.cname}if(e.sendEncodingParameters.length){n.rtcp.ssrc=e.sendEncodingParameters[0].ssrc}e.rtpReceiver.receive(n)}};g.prototype.setLocalDescription=function(e){var t=this;if(-1===["offer","answer"].indexOf(e.type)){return Promise.reject(c("TypeError","Unsupported type \""+e.type+"\""))}if(!o("setLocalDescription",e.type,t.signalingState)||t._isClosed){return Promise.reject(c("InvalidStateError","Can not set local "+e.type+" in state "+t.signalingState))}var r,a;if("offer"===e.type){r=d.splitSections(e.sdp);a=r.shift();r.forEach(function(e,r){var a=d.parseRtpParameters(e);t.transceivers[r].localCapabilities=a});t.transceivers.forEach(function(e,r){t._gather(e.mid,r)})}else if("answer"===e.type){r=d.splitSections(t._remoteDescription.sdp);a=r.shift();var n=0<d.matchPrefix(a,"a=ice-lite").length;r.forEach(function(e,r){var o=t.transceivers[r],s=o.iceGatherer,c=o.iceTransport,p=o.dtlsTransport,m=o.localCapabilities,l=o.remoteCapabilities,g=d.isRejected(e)&&0===d.matchPrefix(e,"a=bundle-only").length;if(!g&&!o.rejected){var h=d.getIceParameters(e,a),f=d.getDtlsParameters(e,a);if(n){f.role="server"}if(!t.usingBundle||0===r){t._gather(o.mid,r);if("new"===c.state){c.start(s,h,n?"controlling":"controlled")}if("new"===p.state){p.start(f)}}var C=i(m,l);t._transceive(o,0<C.codecs.length,!1)}})}t._localDescription={type:e.type,sdp:e.sdp};if("offer"===e.type){t._updateSignalingState("have-local-offer")}else{t._updateSignalingState("stable")}return Promise.resolve()};g.prototype.setRemoteDescription=function(r){var a=this;if(-1===["offer","answer"].indexOf(r.type)){return Promise.reject(c("TypeError","Unsupported type \""+r.type+"\""))}if(!o("setRemoteDescription",r.type,a.signalingState)||a._isClosed){return Promise.reject(c("InvalidStateError","Can not set remote "+r.type+" in state "+a.signalingState))}var n={};a.remoteStreams.forEach(function(e){n[e.id]=e});var g=[],h=d.splitSections(r.sdp),f=h.shift(),C=0<d.matchPrefix(f,"a=ice-lite").length,v=0<d.matchPrefix(f,"a=group:BUNDLE ").length;a.usingBundle=v;var y=d.matchPrefix(f,"a=ice-options:")[0];if(y){a.canTrickleIceCandidates=0<=y.substr(14).split(" ").indexOf("trickle")}else{a.canTrickleIceCandidates=!1}h.forEach(function(o,c){var l=d.splitLines(o),h=d.getKind(o),y=d.isRejected(o)&&0===d.matchPrefix(o,"a=bundle-only").length,u=l[0].substr(2).split(" ")[2],T=d.getDirection(o,f),S=d.parseMsid(o),R=d.getMid(o)||d.generateIdentifier();if(y||"application"===h&&("DTLS/SCTP"===u||"UDP/DTLS/SCTP"===u)){a.transceivers[c]={mid:R,kind:h,protocol:u,rejected:!0};return}if(!y&&a.transceivers[c]&&a.transceivers[c].rejected){a.transceivers[c]=a._createTransceiver(h,!0)}var P,E,k,b,_,x,M,L,I,D=d.parseRtpParameters(o),w,j;if(!y){w=d.getIceParameters(o,f);j=d.getDtlsParameters(o,f);j.role="client"}M=d.parseRtpEncodingParameters(o);var O=d.parseRtcpParameters(o),U=0<d.matchPrefix(o,"a=end-of-candidates",f).length,A=d.matchPrefix(o,"a=candidate:").map(function(e){return d.parseCandidate(e)}).filter(function(e){return 1===e.component});if(("offer"===r.type||"answer"===r.type)&&!y&&v&&0<c&&a.transceivers[c]){a._disposeIceAndDtlsTransports(c);a.transceivers[c].iceGatherer=a.transceivers[0].iceGatherer;a.transceivers[c].iceTransport=a.transceivers[0].iceTransport;a.transceivers[c].dtlsTransport=a.transceivers[0].dtlsTransport;if(a.transceivers[c].rtpSender){a.transceivers[c].rtpSender.setTransport(a.transceivers[0].dtlsTransport)}if(a.transceivers[c].rtpReceiver){a.transceivers[c].rtpReceiver.setTransport(a.transceivers[0].dtlsTransport)}}if("offer"===r.type&&!y){P=a.transceivers[c]||a._createTransceiver(h);P.mid=R;if(!P.iceGatherer){P.iceGatherer=a._createIceGatherer(c,v)}if(A.length&&"new"===P.iceTransport.state){if(U&&(!v||0===c)){P.iceTransport.setRemoteCandidates(A)}else{A.forEach(function(e){s(P.iceTransport,e)})}}L=e.RTCRtpReceiver.getCapabilities(h);if(15019>t){L.codecs=L.codecs.filter(function(e){return"rtx"!==e.name})}x=P.sendEncodingParameters||[{ssrc:1001*(2*c+2)}];var G=!1;if("sendrecv"===T||"sendonly"===T){G=!P.rtpReceiver;_=P.rtpReceiver||new e.RTCRtpReceiver(P.dtlsTransport,h);if(G){var N;I=_.track;if(S&&"-"===S.stream){}else if(S){if(!n[S.stream]){n[S.stream]=new e.MediaStream;Object.defineProperty(n[S.stream],"id",{get:function get(){return S.stream}})}Object.defineProperty(I,"id",{get:function get(){return S.track}});N=n[S.stream]}else{if(!n.default){n.default=new e.MediaStream}N=n.default}if(N){p(I,N);P.associatedRemoteMediaStreams.push(N)}g.push([I,_,N])}}else if(P.rtpReceiver&&P.rtpReceiver.track){P.associatedRemoteMediaStreams.forEach(function(e){var t=e.getTracks().find(function(e){return e.id===P.rtpReceiver.track.id});if(t){m(t,e)}});P.associatedRemoteMediaStreams=[]}P.localCapabilities=L;P.remoteCapabilities=D;P.rtpReceiver=_;P.rtcpParameters=O;P.sendEncodingParameters=x;P.recvEncodingParameters=M;a._transceive(a.transceivers[c],!1,G)}else if("answer"===r.type&&!y){P=a.transceivers[c];E=P.iceGatherer;k=P.iceTransport;b=P.dtlsTransport;_=P.rtpReceiver;x=P.sendEncodingParameters;L=P.localCapabilities;a.transceivers[c].recvEncodingParameters=M;a.transceivers[c].remoteCapabilities=D;a.transceivers[c].rtcpParameters=O;if(A.length&&"new"===k.state){if((C||U)&&(!v||0===c)){k.setRemoteCandidates(A)}else{A.forEach(function(e){s(P.iceTransport,e)})}}if(!v||0===c){if("new"===k.state){k.start(E,w,"controlling")}if("new"===b.state){b.start(j)}}var F=i(P.localCapabilities,P.remoteCapabilities),z=F.codecs.filter(function(e){return"rtx"===e.name.toLowerCase()}).length;if(!z&&P.sendEncodingParameters[0].rtx){delete P.sendEncodingParameters[0].rtx}a._transceive(P,"sendrecv"===T||"recvonly"===T,"sendrecv"===T||"sendonly"===T);if(_&&("sendrecv"===T||"sendonly"===T)){I=_.track;if(S){if(!n[S.stream]){n[S.stream]=new e.MediaStream}p(I,n[S.stream]);g.push([I,_,n[S.stream]])}else{if(!n.default){n.default=new e.MediaStream}p(I,n.default);g.push([I,_,n.default])}}else{delete P.rtpReceiver}}});if(a._dtlsRole===void 0){a._dtlsRole="offer"===r.type?"active":"passive"}a._remoteDescription={type:r.type,sdp:r.sdp};if("offer"===r.type){a._updateSignalingState("have-remote-offer")}else{a._updateSignalingState("stable")}Object.keys(n).forEach(function(t){var r=n[t];if(r.getTracks().length){if(-1===a.remoteStreams.indexOf(r)){a.remoteStreams.push(r);var i=new Event("addstream");i.stream=r;e.setTimeout(function(){a._dispatchEvent("addstream",i)})}g.forEach(function(e){var t=e[0],n=e[1];if(r.id!==e[2].id){return}l(a,t,n,[r])})}});g.forEach(function(e){if(e[2]){return}l(a,e[0],e[1],[])});e.setTimeout(function(){if(!(a&&a.transceivers)){return}a.transceivers.forEach(function(e){if(e.iceTransport&&"new"===e.iceTransport.state&&0<e.iceTransport.getRemoteCandidates().length){console.warn("Timeout for addRemoteCandidate. Consider sending an end-of-candidates notification");e.iceTransport.addRemoteCandidate({})}})},4e3);return Promise.resolve()};g.prototype.close=function(){this.transceivers.forEach(function(e){if(e.iceTransport){e.iceTransport.stop()}if(e.dtlsTransport){e.dtlsTransport.stop()}if(e.rtpSender){e.rtpSender.stop()}if(e.rtpReceiver){e.rtpReceiver.stop()}});this._isClosed=!0;this._updateSignalingState("closed")};g.prototype._updateSignalingState=function(e){this.signalingState=e;var t=new Event("signalingstatechange");this._dispatchEvent("signalingstatechange",t)};g.prototype._maybeFireNegotiationNeeded=function(){var t=this;if("stable"!==this.signalingState||!0===this.needNegotiation){return}this.needNegotiation=!0;e.setTimeout(function(){if(t.needNegotiation){t.needNegotiation=!1;var e=new Event("negotiationneeded");t._dispatchEvent("negotiationneeded",e)}},0)};g.prototype._updateIceConnectionState=function(){var e,t={new:0,closed:0,checking:0,connected:0,completed:0,disconnected:0,failed:0};this.transceivers.forEach(function(e){t[e.iceTransport.state]++});e="new";if(0<t.failed){e="failed"}else if(0<t.checking){e="checking"}else if(0<t.disconnected){e="disconnected"}else if(0<t.new){e="new"}else if(0<t.connected){e="connected"}else if(0<t.completed){e="completed"}if(e!==this.iceConnectionState){this.iceConnectionState=e;var r=new Event("iceconnectionstatechange");this._dispatchEvent("iceconnectionstatechange",r)}};g.prototype._updateConnectionState=function(){var e,t={new:0,closed:0,connecting:0,connected:0,completed:0,disconnected:0,failed:0};this.transceivers.forEach(function(e){t[e.iceTransport.state]++;t[e.dtlsTransport.state]++});t.connected+=t.completed;e="new";if(0<t.failed){e="failed"}else if(0<t.connecting){e="connecting"}else if(0<t.disconnected){e="disconnected"}else if(0<t.new){e="new"}else if(0<t.connected){e="connected"}if(e!==this.connectionState){this.connectionState=e;var r=new Event("connectionstatechange");this._dispatchEvent("connectionstatechange",r)}};g.prototype.createOffer=function(){var r=this;if(r._isClosed){return Promise.reject(c("InvalidStateError","Can not call createOffer after close"))}var n=r.transceivers.filter(function(e){return"audio"===e.kind}).length,i=r.transceivers.filter(function(e){return"video"===e.kind}).length,o=arguments[0];if(o){if(o.mandatory||o.optional){throw new TypeError("Legacy mandatory/optional constraints not supported.")}if(o.offerToReceiveAudio!==void 0){if(!0===o.offerToReceiveAudio){n=1}else if(!1===o.offerToReceiveAudio){n=0}else{n=o.offerToReceiveAudio}}if(o.offerToReceiveVideo!==void 0){if(!0===o.offerToReceiveVideo){i=1}else if(!1===o.offerToReceiveVideo){i=0}else{i=o.offerToReceiveVideo}}}r.transceivers.forEach(function(e){if("audio"===e.kind){n--;if(0>n){e.wantReceive=!1}}else if("video"===e.kind){i--;if(0>i){e.wantReceive=!1}}});while(0<n||0<i){if(0<n){r._createTransceiver("audio");n--}if(0<i){r._createTransceiver("video");i--}}var s=d.writeSessionBoilerplate(r._sdpSessionId,r._sdpSessionVersion++);r.transceivers.forEach(function(a,n){var i=a.track,o=a.kind,s=a.mid||d.generateIdentifier();a.mid=s;if(!a.iceGatherer){a.iceGatherer=r._createIceGatherer(n,r.usingBundle)}var c=e.RTCRtpSender.getCapabilities(o);if(15019>t){c.codecs=c.codecs.filter(function(e){return"rtx"!==e.name})}c.codecs.forEach(function(e){if("H264"===e.name&&e.parameters["level-asymmetry-allowed"]===void 0){e.parameters["level-asymmetry-allowed"]="1"}if(a.remoteCapabilities&&a.remoteCapabilities.codecs){a.remoteCapabilities.codecs.forEach(function(t){if(e.name.toLowerCase()===t.name.toLowerCase()&&e.clockRate===t.clockRate){e.preferredPayloadType=t.payloadType}})}});c.headerExtensions.forEach(function(e){var t=a.remoteCapabilities&&a.remoteCapabilities.headerExtensions||[];t.forEach(function(t){if(e.uri===t.uri){e.id=t.id}})});var p=a.sendEncodingParameters||[{ssrc:1001*(2*n+1)}];if(i){if(15019<=t&&"video"===o&&!p[0].rtx){p[0].rtx={ssrc:p[0].ssrc+1}}}if(a.wantReceive){a.rtpReceiver=new e.RTCRtpReceiver(a.dtlsTransport,o)}a.localCapabilities=c;a.sendEncodingParameters=p});if("max-compat"!==r._config.bundlePolicy){s+="a=group:BUNDLE "+r.transceivers.map(function(e){return e.mid}).join(" ")+"\r\n"}s+="a=ice-options:trickle\r\n";r.transceivers.forEach(function(e,t){s+=a(e,e.localCapabilities,"offer",e.stream,r._dtlsRole);s+="a=rtcp-rsize\r\n";if(e.iceGatherer&&"new"!==r.iceGatheringState&&(0===t||!r.usingBundle)){e.iceGatherer.getLocalCandidates().forEach(function(e){e.component=1;s+="a="+d.writeCandidate(e)+"\r\n"});if("completed"===e.iceGatherer.state){s+="a=end-of-candidates\r\n"}}});var p=new e.RTCSessionDescription({type:"offer",sdp:s});return Promise.resolve(p)};g.prototype.createAnswer=function(){var r=this;if(r._isClosed){return Promise.reject(c("InvalidStateError","Can not call createAnswer after close"))}if(!("have-remote-offer"===r.signalingState||"have-local-pranswer"===r.signalingState)){return Promise.reject(c("InvalidStateError","Can not call createAnswer in signalingState "+r.signalingState))}var n=d.writeSessionBoilerplate(r._sdpSessionId,r._sdpSessionVersion++);if(r.usingBundle){n+="a=group:BUNDLE "+r.transceivers.map(function(e){return e.mid}).join(" ")+"\r\n"}n+="a=ice-options:trickle\r\n";var o=d.getMediaSections(r._remoteDescription.sdp).length;r.transceivers.forEach(function(e,s){if(s+1>o){return}if(e.rejected){if("application"===e.kind){if("DTLS/SCTP"===e.protocol){n+="m=application 0 DTLS/SCTP 5000\r\n"}else{n+="m=application 0 "+e.protocol+" webrtc-datachannel\r\n"}}else if("audio"===e.kind){n+="m=audio 0 UDP/TLS/RTP/SAVPF 0\r\na=rtpmap:0 PCMU/8000\r\n"}else if("video"===e.kind){n+="m=video 0 UDP/TLS/RTP/SAVPF 120\r\na=rtpmap:120 VP8/90000\r\n"}n+="c=IN IP4 0.0.0.0\r\na=inactive\r\na=mid:"+e.mid+"\r\n";return}if(e.stream){var c;if("audio"===e.kind){c=e.stream.getAudioTracks()[0]}else if("video"===e.kind){c=e.stream.getVideoTracks()[0]}if(c){if(15019<=t&&"video"===e.kind&&!e.sendEncodingParameters[0].rtx){e.sendEncodingParameters[0].rtx={ssrc:e.sendEncodingParameters[0].ssrc+1}}}}var d=i(e.localCapabilities,e.remoteCapabilities),p=d.codecs.filter(function(e){return"rtx"===e.name.toLowerCase()}).length;if(!p&&e.sendEncodingParameters[0].rtx){delete e.sendEncodingParameters[0].rtx}n+=a(e,d,"answer",e.stream,r._dtlsRole);if(e.rtcpParameters&&e.rtcpParameters.reducedSize){n+="a=rtcp-rsize\r\n"}});var s=new e.RTCSessionDescription({type:"answer",sdp:n});return Promise.resolve(s)};g.prototype.addIceCandidate=function(e){var t=this,r;if(e&&!(e.sdpMLineIndex!==void 0||e.sdpMid)){return Promise.reject(new TypeError("sdpMLineIndex or sdpMid required"))}return new Promise(function(a,n){if(!t._remoteDescription){return n(c("InvalidStateError","Can not add ICE candidate without a remote description"))}else if(!e||""===e.candidate){for(var o=0;o<t.transceivers.length;o++){if(t.transceivers[o].rejected){continue}t.transceivers[o].iceTransport.addRemoteCandidate({});r=d.getMediaSections(t._remoteDescription.sdp);r[o]+="a=end-of-candidates\r\n";t._remoteDescription.sdp=d.getDescription(t._remoteDescription.sdp)+r.join("");if(t.usingBundle){break}}}else{var p=e.sdpMLineIndex;if(e.sdpMid){for(var m=0;m<t.transceivers.length;m++){if(t.transceivers[m].mid===e.sdpMid){p=m;break}}}var l=t.transceivers[p];if(l){if(l.rejected){return a()}var g=0<Object.keys(e.candidate).length?d.parseCandidate(e.candidate):{};if("tcp"===g.protocol&&(0===g.port||9===g.port)){return a()}if(g.component&&1!==g.component){return a()}if(0===p||0<p&&l.iceTransport!==t.transceivers[0].iceTransport){if(!s(l.iceTransport,g)){return n(c("OperationError","Can not add ICE candidate"))}}var h=e.candidate.trim();if(0===h.indexOf("a=")){h=h.substr(2)}r=d.getMediaSections(t._remoteDescription.sdp);r[p]+="a="+(g.type?h:"end-of-candidates")+"\r\n";t._remoteDescription.sdp=d.getDescription(t._remoteDescription.sdp)+r.join("")}else{return n(c("OperationError","Can not add ICE candidate"))}}a()})};g.prototype.getStats=function(t){if(t&&t instanceof e.MediaStreamTrack){var r=null;this.transceivers.forEach(function(e){if(e.rtpSender&&e.rtpSender.track===t){r=e.rtpSender}else if(e.rtpReceiver&&e.rtpReceiver.track===t){r=e.rtpReceiver}});if(!r){throw c("InvalidAccessError","Invalid selector.")}return r.getStats()}var a=[];this.transceivers.forEach(function(e){["rtpSender","rtpReceiver","iceGatherer","iceTransport","dtlsTransport"].forEach(function(t){if(e[t]){a.push(e[t].getStats())}})});return Promise.all(a).then(function(e){var t=new Map;e.forEach(function(e){e.forEach(function(e){t.set(e.id,e)})});return t})};["RTCRtpSender","RTCRtpReceiver","RTCIceGatherer","RTCIceTransport","RTCDtlsTransport"].forEach(function(t){var a=e[t];if(a&&a.prototype&&a.prototype.getStats){var n=a.prototype.getStats;a.prototype.getStats=function(){return n.apply(this).then(function(e){var t=new Map;Object.keys(e).forEach(function(a){e[a].type=r(e[a]);t.set(a,e[a])});return t})}}});var h=["createOffer","createAnswer"];h.forEach(function(e){var t=g.prototype[e];g.prototype[e]=function(){var e=arguments;if("function"==typeof e[0]||"function"==typeof e[1]){return t.apply(this,[arguments[2]]).then(function(t){if("function"==typeof e[0]){e[0].apply(null,[t])}},function(t){if("function"==typeof e[1]){e[1].apply(null,[t])}})}return t.apply(this,arguments)}});h=["setLocalDescription","setRemoteDescription","addIceCandidate"];h.forEach(function(e){var t=g.prototype[e];g.prototype[e]=function(){var e=arguments;if("function"==typeof e[1]||"function"==typeof e[2]){return t.apply(this,arguments).then(function(){if("function"==typeof e[1]){e[1].apply(null)}},function(t){if("function"==typeof e[2]){e[2].apply(null,[t])}})}return t.apply(this,arguments)}});["getStats"].forEach(function(e){var t=g.prototype[e];g.prototype[e]=function(){var e=arguments;if("function"==typeof e[1]){return t.apply(this,arguments).then(function(){if("function"==typeof e[1]){e[1].apply(null)}})}return t.apply(this,arguments)}});return g}},{sdp:2}],2:[function(e,t){'use strict';var r={generateIdentifier:function(){return Math.random().toString(36).substr(2,10)}};r.localCName=r.generateIdentifier();r.splitLines=function(e){return e.trim().split("\n").map(function(e){return e.trim()})};r.splitSections=function(e){var t=e.split("\nm=");return t.map(function(e,t){return(0<t?"m="+e:e).trim()+"\r\n"})};r.getDescription=function(e){var t=r.splitSections(e);return t&&t[0]};r.getMediaSections=function(e){var t=r.splitSections(e);t.shift();return t};r.matchPrefix=function(e,t){return r.splitLines(e).filter(function(e){return 0===e.indexOf(t)})};r.parseCandidate=function(e){var t;if(0===e.indexOf("a=candidate:")){t=e.substring(12).split(" ")}else{t=e.substring(10).split(" ")}for(var r={foundation:t[0],component:parseInt(t[1],10),protocol:t[2].toLowerCase(),priority:parseInt(t[3],10),ip:t[4],address:t[4],port:parseInt(t[5],10),type:t[7]},a=8;a<t.length;a+=2){switch(t[a]){case"raddr":r.relatedAddress=t[a+1];break;case"rport":r.relatedPort=parseInt(t[a+1],10);break;case"tcptype":r.tcpType=t[a+1];break;case"ufrag":r.ufrag=t[a+1];r.usernameFragment=t[a+1];break;default:r[t[a]]=t[a+1];break;}}return r};r.writeCandidate=function(e){var t=[e.foundation,e.component,e.protocol.toUpperCase(),e.priority,e.address||e.ip,e.port],r=e.type;t.push("typ");t.push(r);if("host"!==r&&e.relatedAddress&&e.relatedPort){t.push("raddr");t.push(e.relatedAddress);t.push("rport");t.push(e.relatedPort)}if(e.tcpType&&"tcp"===e.protocol.toLowerCase()){t.push("tcptype");t.push(e.tcpType)}if(e.usernameFragment||e.ufrag){t.push("ufrag");t.push(e.usernameFragment||e.ufrag)}return"candidate:"+t.join(" ")};r.parseIceOptions=function(e){return e.substr(14).split(" ")};r.parseRtpMap=function(e){var t=e.substr(9).split(" "),r={payloadType:parseInt(t.shift(),10)};t=t[0].split("/");r.name=t[0];r.clockRate=parseInt(t[1],10);r.channels=3===t.length?parseInt(t[2],10):1;r.numChannels=r.channels;return r};r.writeRtpMap=function(e){var t=e.payloadType;if(e.preferredPayloadType!==void 0){t=e.preferredPayloadType}var r=e.channels||e.numChannels||1;return"a=rtpmap:"+t+" "+e.name+"/"+e.clockRate+(1!==r?"/"+r:"")+"\r\n"};r.parseExtmap=function(e){var t=e.substr(9).split(" ");return{id:parseInt(t[0],10),direction:0<t[0].indexOf("/")?t[0].split("/")[1]:"sendrecv",uri:t[1]}};r.writeExtmap=function(e){return"a=extmap:"+(e.id||e.preferredId)+(e.direction&&"sendrecv"!==e.direction?"/"+e.direction:"")+" "+e.uri+"\r\n"};r.parseFmtp=function(e){for(var t={},r,a=e.substr(e.indexOf(" ")+1).split(";"),n=0;n<a.length;n++){r=a[n].trim().split("=");t[r[0].trim()]=r[1]}return t};r.writeFmtp=function(e){var t="",r=e.payloadType;if(e.preferredPayloadType!==void 0){r=e.preferredPayloadType}if(e.parameters&&Object.keys(e.parameters).length){var a=[];Object.keys(e.parameters).forEach(function(t){if(e.parameters[t]){a.push(t+"="+e.parameters[t])}else{a.push(t)}});t+="a=fmtp:"+r+" "+a.join(";")+"\r\n"}return t};r.parseRtcpFb=function(e){var t=e.substr(e.indexOf(" ")+1).split(" ");return{type:t.shift(),parameter:t.join(" ")}};r.writeRtcpFb=function(e){var t="",r=e.payloadType;if(e.preferredPayloadType!==void 0){r=e.preferredPayloadType}if(e.rtcpFeedback&&e.rtcpFeedback.length){e.rtcpFeedback.forEach(function(e){t+="a=rtcp-fb:"+r+" "+e.type+(e.parameter&&e.parameter.length?" "+e.parameter:"")+"\r\n"})}return t};r.parseSsrcMedia=function(e){var t=e.indexOf(" "),r={ssrc:parseInt(e.substr(7,t-7),10)},a=e.indexOf(":",t);if(-1<a){r.attribute=e.substr(t+1,a-t-1);r.value=e.substr(a+1)}else{r.attribute=e.substr(t+1)}return r};r.parseSsrcGroup=function(e){var t=e.substr(13).split(" ");return{semantics:t.shift(),ssrcs:t.map(function(e){return parseInt(e,10)})}};r.getMid=function(e){var t=r.matchPrefix(e,"a=mid:")[0];if(t){return t.substr(6)}};r.parseFingerprint=function(e){var t=e.substr(14).split(" ");return{algorithm:t[0].toLowerCase(),value:t[1]}};r.getDtlsParameters=function(e,t){var a=r.matchPrefix(e+t,"a=fingerprint:");return{role:"auto",fingerprints:a.map(r.parseFingerprint)}};r.writeDtlsParameters=function(e,t){var r="a=setup:"+t+"\r\n";e.fingerprints.forEach(function(e){r+="a=fingerprint:"+e.algorithm+" "+e.value+"\r\n"});return r};r.getIceParameters=function(e,t){var a=r.splitLines(e);a=a.concat(r.splitLines(t));var n={usernameFragment:a.filter(function(e){return 0===e.indexOf("a=ice-ufrag:")})[0].substr(12),password:a.filter(function(e){return 0===e.indexOf("a=ice-pwd:")})[0].substr(10)};return n};r.writeIceParameters=function(e){return"a=ice-ufrag:"+e.usernameFragment+"\r\na=ice-pwd:"+e.password+"\r\n"};r.parseRtpParameters=function(e){for(var t={codecs:[],headerExtensions:[],fecMechanisms:[],rtcp:[]},a=r.splitLines(e),n=a[0].split(" "),o=3;o<n.length;o++){var s=n[o],c=r.matchPrefix(e,"a=rtpmap:"+s+" ")[0];if(c){var d=r.parseRtpMap(c),p=r.matchPrefix(e,"a=fmtp:"+s+" ");d.parameters=p.length?r.parseFmtp(p[0]):{};d.rtcpFeedback=r.matchPrefix(e,"a=rtcp-fb:"+s+" ").map(r.parseRtcpFb);t.codecs.push(d);switch(d.name.toUpperCase()){case"RED":case"ULPFEC":t.fecMechanisms.push(d.name.toUpperCase());break;default:break;}}}r.matchPrefix(e,"a=extmap:").forEach(function(e){t.headerExtensions.push(r.parseExtmap(e))});return t};r.writeRtpDescription=function(e,t){var a="";a+="m="+e+" ";a+=0<t.codecs.length?"9":"0";a+=" UDP/TLS/RTP/SAVPF ";a+=t.codecs.map(function(e){if(e.preferredPayloadType!==void 0){return e.preferredPayloadType}return e.payloadType}).join(" ")+"\r\n";a+="c=IN IP4 0.0.0.0\r\n";a+="a=rtcp:9 IN IP4 0.0.0.0\r\n";t.codecs.forEach(function(e){a+=r.writeRtpMap(e);a+=r.writeFmtp(e);a+=r.writeRtcpFb(e)});var n=0;t.codecs.forEach(function(e){if(e.maxptime>n){n=e.maxptime}});if(0<n){a+="a=maxptime:"+n+"\r\n"}a+="a=rtcp-mux\r\n";if(t.headerExtensions){t.headerExtensions.forEach(function(e){a+=r.writeExtmap(e)})}return a};r.parseRtpEncodingParameters=function(e){var t=[],a=r.parseRtpParameters(e),n=-1!==a.fecMechanisms.indexOf("RED"),i=-1!==a.fecMechanisms.indexOf("ULPFEC"),o=r.matchPrefix(e,"a=ssrc:").map(function(e){return r.parseSsrcMedia(e)}).filter(function(e){return"cname"===e.attribute}),s=0<o.length&&o[0].ssrc,c,d=r.matchPrefix(e,"a=ssrc-group:FID").map(function(e){var t=e.substr(17).split(" ");return t.map(function(e){return parseInt(e,10)})});if(0<d.length&&1<d[0].length&&d[0][0]===s){c=d[0][1]}a.codecs.forEach(function(e){if("RTX"===e.name.toUpperCase()&&e.parameters.apt){var r={ssrc:s,codecPayloadType:parseInt(e.parameters.apt,10)};if(s&&c){r.rtx={ssrc:c}}t.push(r);if(n){r=JSON.parse(JSON.stringify(r));r.fec={ssrc:s,mechanism:i?"red+ulpfec":"red"};t.push(r)}}});if(0===t.length&&s){t.push({ssrc:s})}var p=r.matchPrefix(e,"b=");if(p.length){if(0===p[0].indexOf("b=TIAS:")){p=parseInt(p[0].substr(7),10)}else if(0===p[0].indexOf("b=AS:")){p=.95*(1e3*parseInt(p[0].substr(5),10))-16000}else{p=void 0}t.forEach(function(e){e.maxBitrate=p})}return t};r.parseRtcpParameters=function(e){var t={},a=r.matchPrefix(e,"a=ssrc:").map(function(e){return r.parseSsrcMedia(e)}).filter(function(e){return"cname"===e.attribute})[0];if(a){t.cname=a.value;t.ssrc=a.ssrc}var n=r.matchPrefix(e,"a=rtcp-rsize");t.reducedSize=0<n.length;t.compound=0===n.length;var i=r.matchPrefix(e,"a=rtcp-mux");t.mux=0<i.length;return t};r.parseMsid=function(e){var t,a=r.matchPrefix(e,"a=msid:");if(1===a.length){t=a[0].substr(7).split(" ");return{stream:t[0],track:t[1]}}var n=r.matchPrefix(e,"a=ssrc:").map(function(e){return r.parseSsrcMedia(e)}).filter(function(e){return"msid"===e.attribute});if(0<n.length){t=n[0].value.split(" ");return{stream:t[0],track:t[1]}}};r.generateSessionId=function(){return Math.random().toString().substr(2,21)};r.writeSessionBoilerplate=function(e,t,a){var n,i=t!==void 0?t:2;if(e){n=e}else{n=r.generateSessionId()}return"v=0\r\no="+(a||"thisisadapterortc")+" "+n+" "+i+" IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\n"};r.writeMediaSection=function(e,t,a,n){var i=r.writeRtpDescription(e.kind,t);i+=r.writeIceParameters(e.iceGatherer.getLocalParameters());i+=r.writeDtlsParameters(e.dtlsTransport.getLocalParameters(),"offer"===a?"actpass":"active");i+="a=mid:"+e.mid+"\r\n";if(e.direction){i+="a="+e.direction+"\r\n"}else if(e.rtpSender&&e.rtpReceiver){i+="a=sendrecv\r\n"}else if(e.rtpSender){i+="a=sendonly\r\n"}else if(e.rtpReceiver){i+="a=recvonly\r\n"}else{i+="a=inactive\r\n"}if(e.rtpSender){var o="msid:"+n.id+" "+e.rtpSender.track.id+"\r\n";i+="a="+o;i+="a=ssrc:"+e.sendEncodingParameters[0].ssrc+" "+o;if(e.sendEncodingParameters[0].rtx){i+="a=ssrc:"+e.sendEncodingParameters[0].rtx.ssrc+" "+o;i+="a=ssrc-group:FID "+e.sendEncodingParameters[0].ssrc+" "+e.sendEncodingParameters[0].rtx.ssrc+"\r\n"}}i+="a=ssrc:"+e.sendEncodingParameters[0].ssrc+" cname:"+r.localCName+"\r\n";if(e.rtpSender&&e.sendEncodingParameters[0].rtx){i+="a=ssrc:"+e.sendEncodingParameters[0].rtx.ssrc+" cname:"+r.localCName+"\r\n"}return i};r.getDirection=function(e,t){for(var a=r.splitLines(e),n=0;n<a.length;n++){switch(a[n]){case"a=sendrecv":case"a=sendonly":case"a=recvonly":case"a=inactive":return a[n].substr(2);default:}}if(t){return r.getDirection(t)}return"sendrecv"};r.getKind=function(e){var t=r.splitLines(e),a=t[0].split(" ");return a[0].substr(2)};r.isRejected=function(e){return"0"===e.split(" ",2)[1]};r.parseMLine=function(e){var t=r.splitLines(e),a=t[0].substr(2).split(" ");return{kind:a[0],port:parseInt(a[1],10),protocol:a[2],fmt:a.slice(3).join(" ")}};r.parseOLine=function(e){var t=r.matchPrefix(e,"o=")[0],a=t.substr(2).split(" ");return{username:a[0],sessionId:a[1],sessionVersion:parseInt(a[2],10),netType:a[3],addressType:a[4],address:a[5]}};r.isValidSDP=function(e){if("string"!=typeof e||0===e.length){return!1}for(var t=r.splitLines(e),a=0;a<t.length;a++){if(2>t[a].length||"="!==t[a].charAt(1)){return!1}}return!0};if("object"===_typeof(t)){t.exports=r}},{}],3:[function(e,t){(function(r){'use strict';var a=e("./adapter_factory.js");t.exports=a({window:r.window})}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{"./adapter_factory.js":4}],4:[function(e,t){'use strict';var r=e("./utils");t.exports=function(t,a){var n=t&&t.window,i={shimChrome:!0,shimFirefox:!0,shimEdge:!0,shimSafari:!0};for(var o in a){if(hasOwnProperty.call(a,o)){i[o]=a[o]}}var s=r.log,c=r.detectBrowser(n),d=e("./chrome/chrome_shim")||null,p=e("./edge/edge_shim")||null,m=e("./firefox/firefox_shim")||null,l=e("./safari/safari_shim")||null,g=e("./common_shim")||null,h={browserDetails:c,commonShim:g,extractVersion:r.extractVersion,disableLog:r.disableLog,disableWarnings:r.disableWarnings};switch(c.browser){case"chrome":if(!d||!d.shimPeerConnection||!i.shimChrome){s("Chrome shim is not included in this adapter release.");return h}s("adapter.js shimming chrome.");h.browserShim=d;g.shimCreateObjectURL(n);d.shimGetUserMedia(n);d.shimMediaStream(n);d.shimSourceObject(n);d.shimPeerConnection(n);d.shimOnTrack(n);d.shimAddTrackRemoveTrack(n);d.shimGetSendersWithDtmf(n);d.shimSenderReceiverGetStats(n);d.fixNegotiationNeeded(n);g.shimRTCIceCandidate(n);g.shimMaxMessageSize(n);g.shimSendThrowTypeError(n);break;case"firefox":if(!m||!m.shimPeerConnection||!i.shimFirefox){s("Firefox shim is not included in this adapter release.");return h}s("adapter.js shimming firefox.");h.browserShim=m;g.shimCreateObjectURL(n);m.shimGetUserMedia(n);m.shimSourceObject(n);m.shimPeerConnection(n);m.shimOnTrack(n);m.shimRemoveStream(n);m.shimSenderGetStats(n);m.shimReceiverGetStats(n);m.shimRTCDataChannel(n);g.shimRTCIceCandidate(n);g.shimMaxMessageSize(n);g.shimSendThrowTypeError(n);break;case"edge":if(!p||!p.shimPeerConnection||!i.shimEdge){s("MS edge shim is not included in this adapter release.");return h}s("adapter.js shimming edge.");h.browserShim=p;g.shimCreateObjectURL(n);p.shimGetUserMedia(n);p.shimPeerConnection(n);p.shimReplaceTrack(n);g.shimMaxMessageSize(n);g.shimSendThrowTypeError(n);break;case"safari":if(!l||!i.shimSafari){s("Safari shim is not included in this adapter release.");return h}s("adapter.js shimming safari.");h.browserShim=l;g.shimCreateObjectURL(n);l.shimRTCIceServerUrls(n);l.shimCreateOfferLegacy(n);l.shimCallbacksAPI(n);l.shimLocalStreamsAPI(n);l.shimRemoteStreamsAPI(n);l.shimTrackEventTransceiver(n);l.shimGetUserMedia(n);g.shimRTCIceCandidate(n);g.shimMaxMessageSize(n);g.shimSendThrowTypeError(n);break;default:s("Unsupported browser!");break;}return h}},{"./chrome/chrome_shim":5,"./common_shim":7,"./edge/edge_shim":8,"./firefox/firefox_shim":11,"./safari/safari_shim":13,"./utils":14}],5:[function(e,t){'use strict';var n=e("../utils.js"),i=n.log;function r(e,t,a){if(!t||a.has(t.id)){return}a.set(t.id,t);Object.keys(t).forEach(function(n){if(n.endsWith("Id")){r(e,e.get(t[n]),a)}else if(n.endsWith("Ids")){t[n].forEach(function(t){r(e,e.get(t),a)})}})}function a(e,t,a){var n=a?"outbound-rtp":"inbound-rtp",i=new Map;if(null===t){return i}var o=[];e.forEach(function(e){if("track"===e.type&&e.trackIdentifier===t.id){o.push(e)}});o.forEach(function(t){e.forEach(function(a){if(a.type===n&&a.trackId===t.id){r(e,a,i)}})});return i}t.exports={shimGetUserMedia:e("./getusermedia"),shimMediaStream:function shimMediaStream(e){e.MediaStream=e.MediaStream||e.webkitMediaStream},shimOnTrack:function shimOnTrack(t){if("object"===_typeof(t)&&t.RTCPeerConnection&&!("ontrack"in t.RTCPeerConnection.prototype)){Object.defineProperty(t.RTCPeerConnection.prototype,"ontrack",{get:function get(){return this._ontrack},set:function set(e){if(this._ontrack){this.removeEventListener("track",this._ontrack)}this.addEventListener("track",this._ontrack=e)},enumerable:!0,configurable:!0});var r=t.RTCPeerConnection.prototype.setRemoteDescription;t.RTCPeerConnection.prototype.setRemoteDescription=function(){var a=this;if(!a._ontrackpoly){a._ontrackpoly=function(r){r.stream.addEventListener("addtrack",function(e){var n;if(t.RTCPeerConnection.prototype.getReceivers){n=a.getReceivers().find(function(t){return t.track&&t.track.id===e.track.id})}else{n={track:e.track}}var i=new Event("track");i.track=e.track;i.receiver=n;i.transceiver={receiver:n};i.streams=[r.stream];a.dispatchEvent(i)});r.stream.getTracks().forEach(function(e){var n;if(t.RTCPeerConnection.prototype.getReceivers){n=a.getReceivers().find(function(t){return t.track&&t.track.id===e.id})}else{n={track:e}}var i=new Event("track");i.track=e;i.receiver=n;i.transceiver={receiver:n};i.streams=[r.stream];a.dispatchEvent(i)})};a.addEventListener("addstream",a._ontrackpoly)}return r.apply(a,arguments)}}else{n.wrapPeerConnectionEvent(t,"track",function(t){if(!t.transceiver){Object.defineProperty(t,"transceiver",{value:{receiver:t.receiver}})}return t})}},shimGetSendersWithDtmf:function shimGetSendersWithDtmf(e){if("object"===_typeof(e)&&e.RTCPeerConnection&&!("getSenders"in e.RTCPeerConnection.prototype)&&"createDTMFSender"in e.RTCPeerConnection.prototype){var t=function(e,t){return{track:t,get dtmf(){if(this._dtmf===void 0){if("audio"===t.kind){this._dtmf=e.createDTMFSender(t)}else{this._dtmf=null}}return this._dtmf},_pc:e}};if(!e.RTCPeerConnection.prototype.getSenders){e.RTCPeerConnection.prototype.getSenders=function(){this._senders=this._senders||[];return this._senders.slice()};var r=e.RTCPeerConnection.prototype.addTrack;e.RTCPeerConnection.prototype.addTrack=function(e){var a=this,n=r.apply(a,arguments);if(!n){n=t(a,e);a._senders.push(n)}return n};var a=e.RTCPeerConnection.prototype.removeTrack;e.RTCPeerConnection.prototype.removeTrack=function(e){var t=this;a.apply(t,arguments);var r=t._senders.indexOf(e);if(-1!==r){t._senders.splice(r,1)}}}var n=e.RTCPeerConnection.prototype.addStream;e.RTCPeerConnection.prototype.addStream=function(e){var r=this;r._senders=r._senders||[];n.apply(r,[e]);e.getTracks().forEach(function(e){r._senders.push(t(r,e))})};var i=e.RTCPeerConnection.prototype.removeStream;e.RTCPeerConnection.prototype.removeStream=function(e){var t=this;t._senders=t._senders||[];i.apply(t,[e]);e.getTracks().forEach(function(e){var r=t._senders.find(function(t){return t.track===e});if(r){t._senders.splice(t._senders.indexOf(r),1)}})}}else if("object"===_typeof(e)&&e.RTCPeerConnection&&"getSenders"in e.RTCPeerConnection.prototype&&"createDTMFSender"in e.RTCPeerConnection.prototype&&e.RTCRtpSender&&!("dtmf"in e.RTCRtpSender.prototype)){var o=e.RTCPeerConnection.prototype.getSenders;e.RTCPeerConnection.prototype.getSenders=function(){var e=this,t=o.apply(e,[]);t.forEach(function(t){t._pc=e});return t};Object.defineProperty(e.RTCRtpSender.prototype,"dtmf",{get:function get(){if(this._dtmf===void 0){if("audio"===this.track.kind){this._dtmf=this._pc.createDTMFSender(this.track)}else{this._dtmf=null}}return this._dtmf}})}},shimSenderReceiverGetStats:function shimSenderReceiverGetStats(e){if(!("object"===_typeof(e)&&e.RTCPeerConnection&&e.RTCRtpSender&&e.RTCRtpReceiver)){return}if(!("getStats"in e.RTCRtpSender.prototype)){var t=e.RTCPeerConnection.prototype.getSenders;if(t){e.RTCPeerConnection.prototype.getSenders=function(){var e=this,r=t.apply(e,[]);r.forEach(function(t){t._pc=e});return r}}var r=e.RTCPeerConnection.prototype.addTrack;if(r){e.RTCPeerConnection.prototype.addTrack=function(){var e=r.apply(this,arguments);e._pc=this;return e}}e.RTCRtpSender.prototype.getStats=function(){var e=this;return this._pc.getStats().then(function(t){return a(t,e.track,!0)})}}if(!("getStats"in e.RTCRtpReceiver.prototype)){var i=e.RTCPeerConnection.prototype.getReceivers;if(i){e.RTCPeerConnection.prototype.getReceivers=function(){var e=this,t=i.apply(e,[]);t.forEach(function(t){t._pc=e});return t}}n.wrapPeerConnectionEvent(e,"track",function(t){t.receiver._pc=t.srcElement;return t});e.RTCRtpReceiver.prototype.getStats=function(){var e=this;return this._pc.getStats().then(function(t){return a(t,e.track,!1)})}}if(!("getStats"in e.RTCRtpSender.prototype&&"getStats"in e.RTCRtpReceiver.prototype)){return}var o=e.RTCPeerConnection.prototype.getStats;e.RTCPeerConnection.prototype.getStats=function(){var t=this;if(0<arguments.length&&arguments[0]instanceof e.MediaStreamTrack){var a=arguments[0],n,i,s;t.getSenders().forEach(function(e){if(e.track===a){if(n){s=!0}else{n=e}}});t.getReceivers().forEach(function(e){if(e.track===a){if(i){s=!0}else{i=e}}return e.track===a});if(s||n&&i){return Promise.reject(new DOMException("There are more than one sender or receiver for the track.","InvalidAccessError"))}else if(n){return n.getStats()}else if(i){return i.getStats()}return Promise.reject(new DOMException("There is no sender or receiver for the track.","InvalidAccessError"))}return o.apply(t,arguments)}},shimSourceObject:function shimSourceObject(e){var t=e&&e.URL;if("object"===_typeof(e)){if(e.HTMLMediaElement&&!("srcObject"in e.HTMLMediaElement.prototype)){Object.defineProperty(e.HTMLMediaElement.prototype,"srcObject",{get:function get(){return this._srcObject},set:function set(e){var r=this;this._srcObject=e;if(this.src){t.revokeObjectURL(this.src)}if(!e){this.src="";return}this.src=t.createObjectURL(e);e.addEventListener("addtrack",function(){if(r.src){t.revokeObjectURL(r.src)}r.src=t.createObjectURL(e)});e.addEventListener("removetrack",function(){if(r.src){t.revokeObjectURL(r.src)}r.src=t.createObjectURL(e)})}})}}},shimAddTrackRemoveTrackWithNative:function shimAddTrackRemoveTrackWithNative(e){e.RTCPeerConnection.prototype.getLocalStreams=function(){var e=this;this._shimmedLocalStreams=this._shimmedLocalStreams||{};return Object.keys(this._shimmedLocalStreams).map(function(t){return e._shimmedLocalStreams[t][0]})};var t=e.RTCPeerConnection.prototype.addTrack;e.RTCPeerConnection.prototype.addTrack=function(e,r){if(!r){return t.apply(this,arguments)}this._shimmedLocalStreams=this._shimmedLocalStreams||{};var a=t.apply(this,arguments);if(!this._shimmedLocalStreams[r.id]){this._shimmedLocalStreams[r.id]=[r,a]}else if(-1===this._shimmedLocalStreams[r.id].indexOf(a)){this._shimmedLocalStreams[r.id].push(a)}return a};var r=e.RTCPeerConnection.prototype.addStream;e.RTCPeerConnection.prototype.addStream=function(e){var t=this;this._shimmedLocalStreams=this._shimmedLocalStreams||{};e.getTracks().forEach(function(e){var r=t.getSenders().find(function(t){return t.track===e});if(r){throw new DOMException("Track already exists.","InvalidAccessError")}});var a=t.getSenders();r.apply(this,arguments);var n=t.getSenders().filter(function(e){return-1===a.indexOf(e)});this._shimmedLocalStreams[e.id]=[e].concat(n)};var a=e.RTCPeerConnection.prototype.removeStream;e.RTCPeerConnection.prototype.removeStream=function(e){this._shimmedLocalStreams=this._shimmedLocalStreams||{};delete this._shimmedLocalStreams[e.id];return a.apply(this,arguments)};var n=e.RTCPeerConnection.prototype.removeTrack;e.RTCPeerConnection.prototype.removeTrack=function(e){var t=this;this._shimmedLocalStreams=this._shimmedLocalStreams||{};if(e){Object.keys(this._shimmedLocalStreams).forEach(function(r){var a=t._shimmedLocalStreams[r].indexOf(e);if(-1!==a){t._shimmedLocalStreams[r].splice(a,1)}if(1===t._shimmedLocalStreams[r].length){delete t._shimmedLocalStreams[r]}})}return n.apply(this,arguments)}},shimAddTrackRemoveTrack:function shimAddTrackRemoveTrack(e){var a=n.detectBrowser(e);if(e.RTCPeerConnection.prototype.addTrack&&65<=a.version){return this.shimAddTrackRemoveTrackWithNative(e)}var i=e.RTCPeerConnection.prototype.getLocalStreams;e.RTCPeerConnection.prototype.getLocalStreams=function(){var e=this,t=i.apply(this);e._reverseStreams=e._reverseStreams||{};return t.map(function(t){return e._reverseStreams[t.id]})};var o=e.RTCPeerConnection.prototype.addStream;e.RTCPeerConnection.prototype.addStream=function(t){var r=this;r._streams=r._streams||{};r._reverseStreams=r._reverseStreams||{};t.getTracks().forEach(function(e){var t=r.getSenders().find(function(t){return t.track===e});if(t){throw new DOMException("Track already exists.","InvalidAccessError")}});if(!r._reverseStreams[t.id]){var a=new e.MediaStream(t.getTracks());r._streams[t.id]=a;r._reverseStreams[a.id]=t;t=a}o.apply(r,[t])};var s=e.RTCPeerConnection.prototype.removeStream;e.RTCPeerConnection.prototype.removeStream=function(e){var t=this;t._streams=t._streams||{};t._reverseStreams=t._reverseStreams||{};s.apply(t,[t._streams[e.id]||e]);delete t._reverseStreams[t._streams[e.id]?t._streams[e.id].id:e.id];delete t._streams[e.id]};e.RTCPeerConnection.prototype.addTrack=function(r,a){var n=this;if("closed"===n.signalingState){throw new DOMException("The RTCPeerConnection's signalingState is 'closed'.","InvalidStateError")}var t=[].slice.call(arguments,1);if(1!==t.length||!t[0].getTracks().find(function(e){return e===r})){throw new DOMException("The adapter.js addTrack polyfill only supports a single  stream which is associated with the specified track.","NotSupportedError")}var i=n.getSenders().find(function(e){return e.track===r});if(i){throw new DOMException("Track already exists.","InvalidAccessError")}n._streams=n._streams||{};n._reverseStreams=n._reverseStreams||{};var o=n._streams[a.id];if(o){o.addTrack(r);Promise.resolve().then(function(){n.dispatchEvent(new Event("negotiationneeded"))})}else{var s=new e.MediaStream([r]);n._streams[a.id]=s;n._reverseStreams[s.id]=a;n.addStream(s)}return n.getSenders().find(function(e){return e.track===r})};function t(e,t){var r=t.sdp;Object.keys(e._reverseStreams||[]).forEach(function(t){var a=e._reverseStreams[t],n=e._streams[a.id];r=r.replace(new RegExp(n.id,"g"),a.id)});return new RTCSessionDescription({type:t.type,sdp:r})}function r(e,t){var r=t.sdp;Object.keys(e._reverseStreams||[]).forEach(function(t){var a=e._reverseStreams[t],n=e._streams[a.id];r=r.replace(new RegExp(a.id,"g"),n.id)});return new RTCSessionDescription({type:t.type,sdp:r})}["createOffer","createAnswer"].forEach(function(r){var a=e.RTCPeerConnection.prototype[r];e.RTCPeerConnection.prototype[r]=function(){var e=this,r=arguments,n=arguments.length&&"function"==typeof arguments[0];if(n){return a.apply(e,[function(a){var n=t(e,a);r[0].apply(null,[n])},function(e){if(r[1]){r[1].apply(null,e)}},arguments[2]])}return a.apply(e,arguments).then(function(r){return t(e,r)})}});var c=e.RTCPeerConnection.prototype.setLocalDescription;e.RTCPeerConnection.prototype.setLocalDescription=function(){var e=this;if(!arguments.length||!arguments[0].type){return c.apply(e,arguments)}arguments[0]=r(e,arguments[0]);return c.apply(e,arguments)};var d=Object.getOwnPropertyDescriptor(e.RTCPeerConnection.prototype,"localDescription");Object.defineProperty(e.RTCPeerConnection.prototype,"localDescription",{get:function get(){var e=this,r=d.get.apply(this);if(""===r.type){return r}return t(e,r)}});e.RTCPeerConnection.prototype.removeTrack=function(e){var t=this;if("closed"===t.signalingState){throw new DOMException("The RTCPeerConnection's signalingState is 'closed'.","InvalidStateError")}if(!e._pc){throw new DOMException("Argument 1 of RTCPeerConnection.removeTrack does not implement interface RTCRtpSender.","TypeError")}var r=e._pc===t;if(!r){throw new DOMException("Sender was not created by this connection.","InvalidAccessError")}t._streams=t._streams||{};var a;Object.keys(t._streams).forEach(function(r){var n=t._streams[r].getTracks().find(function(t){return e.track===t});if(n){a=t._streams[r]}});if(a){if(1===a.getTracks().length){t.removeStream(t._reverseStreams[a.id])}else{a.removeTrack(e.track)}t.dispatchEvent(new Event("negotiationneeded"))}}},shimPeerConnection:function shimPeerConnection(e){var t=n.detectBrowser(e);if(!e.RTCPeerConnection&&e.webkitRTCPeerConnection){e.RTCPeerConnection=function(t,r){i("PeerConnection");if(t&&t.iceTransportPolicy){t.iceTransports=t.iceTransportPolicy}return new e.webkitRTCPeerConnection(t,r)};e.RTCPeerConnection.prototype=e.webkitRTCPeerConnection.prototype;if(e.webkitRTCPeerConnection.generateCertificate){Object.defineProperty(e.RTCPeerConnection,"generateCertificate",{get:function get(){return e.webkitRTCPeerConnection.generateCertificate}})}}var r=e.RTCPeerConnection.prototype.getStats;e.RTCPeerConnection.prototype.getStats=function(e,t,a){var n=this,i=arguments;if(0<arguments.length&&"function"==typeof e){return r.apply(this,arguments)}if(0===r.length&&(0===arguments.length||"function"!=typeof arguments[0])){return r.apply(this,[])}var o=function(e){var t={},r=e.result();r.forEach(function(e){var r={id:e.id,timestamp:e.timestamp,type:{localcandidate:"local-candidate",remotecandidate:"remote-candidate"}[e.type]||e.type};e.names().forEach(function(t){r[t]=e.stat(t)});t[r.id]=r});return t},s=function(e){return new Map(Object.keys(e).map(function(t){return[t,e[t]]}))};if(2<=arguments.length){var c=function(e){i[1](s(o(e)))};return r.apply(this,[c,arguments[0]])}return new Promise(function(e,t){r.apply(n,[function(t){e(s(o(t)))},t])}).then(t,a)};if(51>t.version){["setLocalDescription","setRemoteDescription","addIceCandidate"].forEach(function(t){var r=e.RTCPeerConnection.prototype[t];e.RTCPeerConnection.prototype[t]=function(){var e=arguments,t=this,a=new Promise(function(a,n){r.apply(t,[e[0],a,n])});if(2>e.length){return a}return a.then(function(){e[1].apply(null,[])},function(t){if(3<=e.length){e[2].apply(null,[t])}})}})}if(52>t.version){["createOffer","createAnswer"].forEach(function(t){var r=e.RTCPeerConnection.prototype[t];e.RTCPeerConnection.prototype[t]=function(){var e=this;if(1>arguments.length||1===arguments.length&&"object"===_typeof(arguments[0])){var t=1===arguments.length?arguments[0]:void 0;return new Promise(function(a,n){r.apply(e,[a,n,t])})}return r.apply(this,arguments)}})}["setLocalDescription","setRemoteDescription","addIceCandidate"].forEach(function(t){var r=e.RTCPeerConnection.prototype[t];e.RTCPeerConnection.prototype[t]=function(){arguments[0]=new("addIceCandidate"===t?e.RTCIceCandidate:e.RTCSessionDescription)(arguments[0]);return r.apply(this,arguments)}});var a=e.RTCPeerConnection.prototype.addIceCandidate;e.RTCPeerConnection.prototype.addIceCandidate=function(){if(!arguments[0]){if(arguments[1]){arguments[1].apply(null)}return Promise.resolve()}return a.apply(this,arguments)}},fixNegotiationNeeded:function fixNegotiationNeeded(e){n.wrapPeerConnectionEvent(e,"negotiationneeded",function(t){var e=t.target;if("stable"!==e.signalingState){return}return t})},shimGetDisplayMedia:function shimGetDisplayMedia(e,t){if("getDisplayMedia"in e.navigator){return}if("function"!=typeof t){console.error("shimGetDisplayMedia: getSourceId argument is not a function");return}navigator.getDisplayMedia=function(e){return t(e).then(function(t){e.video={mandatory:{chromeMediaSource:"desktop",chromeMediaSourceId:t,maxFrameRate:e.video.frameRate||3}};return navigator.mediaDevices.getUserMedia(e)})}}}},{"../utils.js":14,"./getusermedia":6}],6:[function(e,t){'use strict';var r=e("../utils.js"),a=r.log;t.exports=function(e){var t=r.detectBrowser(e),n=e&&e.navigator,i=function(e){if("object"!==_typeof(e)||e.mandatory||e.optional){return e}var t={};Object.keys(e).forEach(function(a){if("require"===a||"advanced"===a||"mediaSource"===a){return}var n="object"===_typeof(e[a])?e[a]:{ideal:e[a]};if(n.exact!==void 0&&"number"==typeof n.exact){n.min=n.max=n.exact}var r=function(e,t){if(e){return e+t.charAt(0).toUpperCase()+t.slice(1)}return"deviceId"===t?"sourceId":t};if(n.ideal!==void 0){t.optional=t.optional||[];var i={};if("number"==typeof n.ideal){i[r("min",a)]=n.ideal;t.optional.push(i);i={};i[r("max",a)]=n.ideal;t.optional.push(i)}else{i[r("",a)]=n.ideal;t.optional.push(i)}}if(n.exact!==void 0&&"number"!=typeof n.exact){t.mandatory=t.mandatory||{};t.mandatory[r("",a)]=n.exact}else{["min","max"].forEach(function(e){if(n[e]!==void 0){t.mandatory=t.mandatory||{};t.mandatory[r(e,a)]=n[e]}})}});if(e.advanced){t.optional=(t.optional||[]).concat(e.advanced)}return t},o=function(e,r){if(61<=t.version){return r(e)}e=JSON.parse(JSON.stringify(e));if(e&&"object"===_typeof(e.audio)){var o=function(e,t,r){if(t in e&&!(r in e)){e[r]=e[t];delete e[t]}};e=JSON.parse(JSON.stringify(e));o(e.audio,"autoGainControl","googAutoGainControl");o(e.audio,"noiseSuppression","googNoiseSuppression");e.audio=i(e.audio)}if(e&&"object"===_typeof(e.video)){var s=e.video.facingMode;s=s&&("object"===_typeof(s)?s:{ideal:s});var c=66>t.version;if(s&&("user"===s.exact||"environment"===s.exact||"user"===s.ideal||"environment"===s.ideal)&&!(n.mediaDevices.getSupportedConstraints&&n.mediaDevices.getSupportedConstraints().facingMode&&!c)){delete e.video.facingMode;var p;if("environment"===s.exact||"environment"===s.ideal){p=["back","rear"]}else if("user"===s.exact||"user"===s.ideal){p=["front"]}if(p){return n.mediaDevices.enumerateDevices().then(function(t){t=t.filter(function(e){return"videoinput"===e.kind});var n=t.find(function(e){return p.some(function(t){return-1!==e.label.toLowerCase().indexOf(t)})});if(!n&&t.length&&-1!==p.indexOf("back")){n=t[t.length-1]}if(n){e.video.deviceId=s.exact?{exact:n.deviceId}:{ideal:n.deviceId}}e.video=i(e.video);a("chrome: "+JSON.stringify(e));return r(e)})}}e.video=i(e.video)}a("chrome: "+JSON.stringify(e));return r(e)},s=function(r){if(64<=t.version){return r}return{name:{PermissionDeniedError:"NotAllowedError",PermissionDismissedError:"NotAllowedError",InvalidStateError:"NotAllowedError",DevicesNotFoundError:"NotFoundError",ConstraintNotSatisfiedError:"OverconstrainedError",TrackStartError:"NotReadableError",MediaDeviceFailedDueToShutdown:"NotAllowedError",MediaDeviceKillSwitchOn:"NotAllowedError",TabCaptureError:"AbortError",ScreenCaptureError:"AbortError",DeviceCaptureError:"AbortError"}[r.name]||r.name,message:r.message,constraint:r.constraint||r.constraintName,toString:function toString(){return this.name+(this.message&&": ")+this.message}}};n.getUserMedia=function getUserMedia_(e,t,r){o(e,function(e){n.webkitGetUserMedia(e,t,function(t){if(r){r(s(t))}})})};var c=function(e){return new Promise(function(t,r){n.getUserMedia(e,t,r)})};if(!n.mediaDevices){n.mediaDevices={getUserMedia:c,enumerateDevices:function enumerateDevices(){return new Promise(function(t){var r={audio:"audioinput",video:"videoinput"};return e.MediaStreamTrack.getSources(function(e){t(e.map(function(e){return{label:e.label,kind:r[e.kind],deviceId:e.id,groupId:""}}))})})},getSupportedConstraints:function getSupportedConstraints(){return{deviceId:!0,echoCancellation:!0,facingMode:!0,frameRate:!0,height:!0,width:!0}}}}if(!n.mediaDevices.getUserMedia){n.mediaDevices.getUserMedia=function(e){return c(e)}}else{var d=n.mediaDevices.getUserMedia.bind(n.mediaDevices);n.mediaDevices.getUserMedia=function(e){return o(e,function(e){return d(e).then(function(t){if(e.audio&&!t.getAudioTracks().length||e.video&&!t.getVideoTracks().length){t.getTracks().forEach(function(e){e.stop()});throw new DOMException("","NotFoundError")}return t},function(t){return Promise.reject(s(t))})})}}if("undefined"==typeof n.mediaDevices.addEventListener){n.mediaDevices.addEventListener=function(){a("Dummy mediaDevices.addEventListener called.")}}if("undefined"==typeof n.mediaDevices.removeEventListener){n.mediaDevices.removeEventListener=function(){a("Dummy mediaDevices.removeEventListener called.")}}}},{"../utils.js":14}],7:[function(e,t){'use strict';var r=e("sdp"),a=e("./utils");t.exports={shimRTCIceCandidate:function shimRTCIceCandidate(t){if(!t.RTCIceCandidate||t.RTCIceCandidate&&"foundation"in t.RTCIceCandidate.prototype){return}var n=t.RTCIceCandidate;t.RTCIceCandidate=function(e){if("object"===_typeof(e)&&e.candidate&&0===e.candidate.indexOf("a=")){e=JSON.parse(JSON.stringify(e));e.candidate=e.candidate.substr(2)}if(e.candidate&&e.candidate.length){var t=new n(e),a=r.parseCandidate(e.candidate),i=Object.assign(t,a);i.toJSON=function(){return{candidate:i.candidate,sdpMid:i.sdpMid,sdpMLineIndex:i.sdpMLineIndex,usernameFragment:i.usernameFragment}};return i}return new n(e)};t.RTCIceCandidate.prototype=n.prototype;a.wrapPeerConnectionEvent(t,"icecandidate",function(r){if(r.candidate){Object.defineProperty(r,"candidate",{value:new t.RTCIceCandidate(r.candidate),writable:"false"})}return r})},shimCreateObjectURL:function shimCreateObjectURL(e){var t=e&&e.URL;if(!("object"===_typeof(e)&&e.HTMLMediaElement&&"srcObject"in e.HTMLMediaElement.prototype&&t.createObjectURL&&t.revokeObjectURL)){return}var r=t.createObjectURL.bind(t),n=t.revokeObjectURL.bind(t),i=new Map,o=0;t.createObjectURL=function(e){if("getTracks"in e){var t="polyblob:"+ ++o;i.set(t,e);a.deprecated("URL.createObjectURL(stream)","elem.srcObject = stream");return t}return r(e)};t.revokeObjectURL=function(e){n(e);i.delete(e)};var s=Object.getOwnPropertyDescriptor(e.HTMLMediaElement.prototype,"src");Object.defineProperty(e.HTMLMediaElement.prototype,"src",{get:function get(){return s.get.apply(this)},set:function set(e){this.srcObject=i.get(e)||null;return s.set.apply(this,[e])}});var c=e.HTMLMediaElement.prototype.setAttribute;e.HTMLMediaElement.prototype.setAttribute=function(){if(2===arguments.length&&"src"===(""+arguments[0]).toLowerCase()){this.srcObject=i.get(arguments[1])||null}return c.apply(this,arguments)}},shimMaxMessageSize:function shimMaxMessageSize(e){if(e.RTCSctpTransport||!e.RTCPeerConnection){return}var t=a.detectBrowser(e);if(!("sctp"in e.RTCPeerConnection.prototype)){Object.defineProperty(e.RTCPeerConnection.prototype,"sctp",{get:function get(){return"undefined"==typeof this._sctp?null:this._sctp}})}var n=function(e){var t=r.splitSections(e.sdp);t.shift();return t.some(function(e){var t=r.parseMLine(e);return t&&"application"===t.kind&&-1!==t.protocol.indexOf("SCTP")})},i=function(e){var t=e.sdp.match(/mozilla...THIS_IS_SDPARTA-(\d+)/);if(null===t||2>t.length){return-1}var r=parseInt(t[1],10);return r!==r?-1:r},o=function(e){var r=65536;if("firefox"===t.browser){if(57>t.version){if(-1===e){r=16384}else{r=2147483637}}else if(60>t.version){r=57===t.version?65535:65536}else{r=2147483637}}return r},s=function(e,a){var n=65536;if("firefox"===t.browser&&57===t.version){n=65535}var i=r.matchPrefix(e.sdp,"a=max-message-size:");if(0<i.length){n=parseInt(i[0].substr(19),10)}else if("firefox"===t.browser&&-1!==a){n=2147483637}return n},c=e.RTCPeerConnection.prototype.setRemoteDescription;e.RTCPeerConnection.prototype.setRemoteDescription=function(){var e=this;e._sctp=null;if(n(arguments[0])){var t=i(arguments[0]),r=o(t),a=s(arguments[0],t),d;if(0===r&&0===a){d=Number.POSITIVE_INFINITY}else if(0===r||0===a){d=Math.max(r,a)}else{d=Math.min(r,a)}var p={};Object.defineProperty(p,"maxMessageSize",{get:function get(){return d}});e._sctp=p}return c.apply(e,arguments)}},shimSendThrowTypeError:function shimSendThrowTypeError(e){if(!(e.RTCPeerConnection&&"createDataChannel"in e.RTCPeerConnection.prototype)){return}function t(e,t){var r=e.send;e.send=function(){var a=arguments[0],n=a.length||a.size||a.byteLength;if("open"===e.readyState&&t.sctp&&n>t.sctp.maxMessageSize){throw new TypeError("Message too large (can send a maximum of "+t.sctp.maxMessageSize+" bytes)")}return r.apply(e,arguments)}}var r=e.RTCPeerConnection.prototype.createDataChannel;e.RTCPeerConnection.prototype.createDataChannel=function(){var e=this,a=r.apply(e,arguments);t(a,e);return a};a.wrapPeerConnectionEvent(e,"datachannel",function(r){t(r.channel,r.target);return r})}}},{"./utils":14,sdp:2}],8:[function(e,t){'use strict';var r=e("../utils"),a=e("./filtericeservers"),n=e("rtcpeerconnection-shim");t.exports={shimGetUserMedia:e("./getusermedia"),shimPeerConnection:function shimPeerConnection(e){var t=r.detectBrowser(e);if(e.RTCIceGatherer){if(!e.RTCIceCandidate){e.RTCIceCandidate=function(e){return e}}if(!e.RTCSessionDescription){e.RTCSessionDescription=function(e){return e}}if(15025>t.version){var i=Object.getOwnPropertyDescriptor(e.MediaStreamTrack.prototype,"enabled");Object.defineProperty(e.MediaStreamTrack.prototype,"enabled",{set:function set(e){i.set.call(this,e);var t=new Event("enabled");t.enabled=e;this.dispatchEvent(t)}})}}if(e.RTCRtpSender&&!("dtmf"in e.RTCRtpSender.prototype)){Object.defineProperty(e.RTCRtpSender.prototype,"dtmf",{get:function get(){if(this._dtmf===void 0){if("audio"===this.track.kind){this._dtmf=new e.RTCDtmfSender(this)}else if("video"===this.track.kind){this._dtmf=null}}return this._dtmf}})}if(e.RTCDtmfSender&&!e.RTCDTMFSender){e.RTCDTMFSender=e.RTCDtmfSender}var o=n(e,t.version);e.RTCPeerConnection=function(e){if(e&&e.iceServers){e.iceServers=a(e.iceServers)}return new o(e)};e.RTCPeerConnection.prototype=o.prototype},shimReplaceTrack:function shimReplaceTrack(e){if(e.RTCRtpSender&&!("replaceTrack"in e.RTCRtpSender.prototype)){e.RTCRtpSender.prototype.replaceTrack=e.RTCRtpSender.prototype.setTrack}}}},{"../utils":14,"./filtericeservers":9,"./getusermedia":10,"rtcpeerconnection-shim":1}],9:[function(e,t){'use strict';var r=e("../utils");t.exports=function(e,t){var a=!1;e=JSON.parse(JSON.stringify(e));return e.filter(function(e){if(e&&(e.urls||e.url)){var n=e.urls||e.url;if(e.url&&!e.urls){r.deprecated("RTCIceServer.url","RTCIceServer.urls")}var i="string"==typeof n;if(i){n=[n]}n=n.filter(function(e){var r=0===e.indexOf("turn:")&&-1!==e.indexOf("transport=udp")&&-1===e.indexOf("turn:[")&&!a;if(r){a=!0;return!0}return 0===e.indexOf("stun:")&&14393<=t&&-1===e.indexOf("?transport=udp")});delete e.url;e.urls=i?n[0]:n;return!!n.length}})}},{"../utils":14}],10:[function(e,t){'use strict';t.exports=function(e){var t=e&&e.navigator,r=function(t){return{name:{PermissionDeniedError:"NotAllowedError"}[t.name]||t.name,message:t.message,constraint:t.constraint,toString:function toString(){return this.name}}},a=t.mediaDevices.getUserMedia.bind(t.mediaDevices);t.mediaDevices.getUserMedia=function(e){return a(e).catch(function(t){return Promise.reject(r(t))})}}},{}],11:[function(e,t){'use strict';var r=e("../utils");t.exports={shimGetUserMedia:e("./getusermedia"),shimOnTrack:function shimOnTrack(e){if("object"===_typeof(e)&&e.RTCPeerConnection&&!("ontrack"in e.RTCPeerConnection.prototype)){Object.defineProperty(e.RTCPeerConnection.prototype,"ontrack",{get:function get(){return this._ontrack},set:function set(e){if(this._ontrack){this.removeEventListener("track",this._ontrack);this.removeEventListener("addstream",this._ontrackpoly)}this.addEventListener("track",this._ontrack=e);this.addEventListener("addstream",this._ontrackpoly=function(t){t.stream.getTracks().forEach(function(e){var r=new Event("track");r.track=e;r.receiver={track:e};r.transceiver={receiver:r.receiver};r.streams=[t.stream];this.dispatchEvent(r)}.bind(this))}.bind(this))},enumerable:!0,configurable:!0})}if("object"===_typeof(e)&&e.RTCTrackEvent&&"receiver"in e.RTCTrackEvent.prototype&&!("transceiver"in e.RTCTrackEvent.prototype)){Object.defineProperty(e.RTCTrackEvent.prototype,"transceiver",{get:function get(){return{receiver:this.receiver}}})}},shimSourceObject:function shimSourceObject(e){if("object"===_typeof(e)){if(e.HTMLMediaElement&&!("srcObject"in e.HTMLMediaElement.prototype)){Object.defineProperty(e.HTMLMediaElement.prototype,"srcObject",{get:function get(){return this.mozSrcObject},set:function set(e){this.mozSrcObject=e}})}}},shimPeerConnection:function shimPeerConnection(e){var t=r.detectBrowser(e);if("object"!==_typeof(e)||!(e.RTCPeerConnection||e.mozRTCPeerConnection)){return}if(!e.RTCPeerConnection){e.RTCPeerConnection=function(r,a){if(38>t.version){if(r&&r.iceServers){for(var n=[],o=0,s;o<r.iceServers.length;o++){s=r.iceServers[o];if(s.hasOwnProperty("urls")){for(var c=0,d;c<s.urls.length;c++){d={url:s.urls[c]};if(0===s.urls[c].indexOf("turn")){d.username=s.username;d.credential=s.credential}n.push(d)}}else{n.push(r.iceServers[o])}}r.iceServers=n}}return new e.mozRTCPeerConnection(r,a)};e.RTCPeerConnection.prototype=e.mozRTCPeerConnection.prototype;if(e.mozRTCPeerConnection.generateCertificate){Object.defineProperty(e.RTCPeerConnection,"generateCertificate",{get:function get(){return e.mozRTCPeerConnection.generateCertificate}})}e.RTCSessionDescription=e.mozRTCSessionDescription;e.RTCIceCandidate=e.mozRTCIceCandidate}["setLocalDescription","setRemoteDescription","addIceCandidate"].forEach(function(t){var r=e.RTCPeerConnection.prototype[t];e.RTCPeerConnection.prototype[t]=function(){arguments[0]=new("addIceCandidate"===t?e.RTCIceCandidate:e.RTCSessionDescription)(arguments[0]);return r.apply(this,arguments)}});var a=e.RTCPeerConnection.prototype.addIceCandidate;e.RTCPeerConnection.prototype.addIceCandidate=function(){if(!arguments[0]){if(arguments[1]){arguments[1].apply(null)}return Promise.resolve()}return a.apply(this,arguments)};var n=function(e){var t=new Map;Object.keys(e).forEach(function(r){t.set(r,e[r]);t[r]=e[r]});return t},o={inboundrtp:"inbound-rtp",outboundrtp:"outbound-rtp",candidatepair:"candidate-pair",localcandidate:"local-candidate",remotecandidate:"remote-candidate"},s=e.RTCPeerConnection.prototype.getStats;e.RTCPeerConnection.prototype.getStats=function(e,r,a){return s.apply(this,[e||null]).then(function(a){if(48>t.version){a=n(a)}if(53>t.version&&!r){try{a.forEach(function(e){e.type=o[e.type]||e.type})}catch(t){if("TypeError"!==t.name){throw t}a.forEach(function(e,t){a.set(t,Object.assign({},e,{type:o[e.type]||e.type}))})}}return a}).then(r,a)}},shimSenderGetStats:function shimSenderGetStats(e){if(!("object"===_typeof(e)&&e.RTCPeerConnection&&e.RTCRtpSender)){return}if(e.RTCRtpSender&&"getStats"in e.RTCRtpSender.prototype){return}var t=e.RTCPeerConnection.prototype.getSenders;if(t){e.RTCPeerConnection.prototype.getSenders=function(){var e=this,r=t.apply(e,[]);r.forEach(function(t){t._pc=e});return r}}var r=e.RTCPeerConnection.prototype.addTrack;if(r){e.RTCPeerConnection.prototype.addTrack=function(){var e=r.apply(this,arguments);e._pc=this;return e}}e.RTCRtpSender.prototype.getStats=function(){return this.track?this._pc.getStats(this.track):Promise.resolve(new Map)}},shimReceiverGetStats:function shimReceiverGetStats(e){if(!("object"===_typeof(e)&&e.RTCPeerConnection&&e.RTCRtpSender)){return}if(e.RTCRtpSender&&"getStats"in e.RTCRtpReceiver.prototype){return}var t=e.RTCPeerConnection.prototype.getReceivers;if(t){e.RTCPeerConnection.prototype.getReceivers=function(){var e=this,r=t.apply(e,[]);r.forEach(function(t){t._pc=e});return r}}r.wrapPeerConnectionEvent(e,"track",function(t){t.receiver._pc=t.srcElement;return t});e.RTCRtpReceiver.prototype.getStats=function(){return this._pc.getStats(this.track)}},shimRemoveStream:function shimRemoveStream(e){if(!e.RTCPeerConnection||"removeStream"in e.RTCPeerConnection.prototype){return}e.RTCPeerConnection.prototype.removeStream=function(e){var t=this;r.deprecated("removeStream","removeTrack");this.getSenders().forEach(function(r){if(r.track&&-1!==e.getTracks().indexOf(r.track)){t.removeTrack(r)}})}},shimRTCDataChannel:function shimRTCDataChannel(e){if(e.DataChannel&&!e.RTCDataChannel){e.RTCDataChannel=e.DataChannel}},shimGetDisplayMedia:function shimGetDisplayMedia(e,t){if("getDisplayMedia"in e.navigator){return}navigator.getDisplayMedia=function(e){if(!(e&&e.video)){var r=new DOMException("getDisplayMedia without video constraints is undefined");r.name="NotFoundError";r.code=8;return Promise.reject(r)}if(!0===e.video){e.video={mediaSource:t}}else{e.video.mediaSource=t}return navigator.mediaDevices.getUserMedia(e)}}}},{"../utils":14,"./getusermedia":12}],12:[function(e,t){'use strict';var r=e("../utils"),a=r.log;t.exports=function(e){var t=r.detectBrowser(e),n=e&&e.navigator,i=e&&e.MediaStreamTrack,o=function(t){return{name:{InternalError:"NotReadableError",NotSupportedError:"TypeError",PermissionDeniedError:"NotAllowedError",SecurityError:"NotAllowedError"}[t.name]||t.name,message:{"The operation is insecure.":"The request is not allowed by the user agent or the platform in the current context."}[t.message]||t.message,constraint:t.constraint,toString:function toString(){return this.name+(this.message&&": ")+this.message}}},s=function(e,r,i){var s=function(e){if("object"!==_typeof(e)||e.require){return e}var t=[];Object.keys(e).forEach(function(a){if("require"===a||"advanced"===a||"mediaSource"===a){return}var n=e[a]="object"===_typeof(e[a])?e[a]:{ideal:e[a]};if(n.min!==void 0||n.max!==void 0||n.exact!==void 0){t.push(a)}if(n.exact!==void 0){if("number"==typeof n.exact){n.min=n.max=n.exact}else{e[a]=n.exact}delete n.exact}if(n.ideal!==void 0){e.advanced=e.advanced||[];var r={};if("number"==typeof n.ideal){r[a]={min:n.ideal,max:n.ideal}}else{r[a]=n.ideal}e.advanced.push(r);delete n.ideal;if(!Object.keys(n).length){delete e[a]}}});if(t.length){e.require=t}return e};e=JSON.parse(JSON.stringify(e));if(38>t.version){a("spec: "+JSON.stringify(e));if(e.audio){e.audio=s(e.audio)}if(e.video){e.video=s(e.video)}a("ff37: "+JSON.stringify(e))}return n.mozGetUserMedia(e,r,function(t){i(o(t))})},c=function(e){return new Promise(function(t,r){s(e,t,r)})};if(!n.mediaDevices){n.mediaDevices={getUserMedia:c,addEventListener:function addEventListener(){},removeEventListener:function removeEventListener(){}}}n.mediaDevices.enumerateDevices=n.mediaDevices.enumerateDevices||function(){return new Promise(function(e){e([{kind:"audioinput",deviceId:"default",label:"",groupId:""},{kind:"videoinput",deviceId:"default",label:"",groupId:""}])})};if(41>t.version){var d=n.mediaDevices.enumerateDevices.bind(n.mediaDevices);n.mediaDevices.enumerateDevices=function(){return d().then(void 0,function(t){if("NotFoundError"===t.name){return[]}throw t})}}if(49>t.version){var p=n.mediaDevices.getUserMedia.bind(n.mediaDevices);n.mediaDevices.getUserMedia=function(e){return p(e).then(function(t){if(e.audio&&!t.getAudioTracks().length||e.video&&!t.getVideoTracks().length){t.getTracks().forEach(function(e){e.stop()});throw new DOMException("The object can not be found here.","NotFoundError")}return t},function(t){return Promise.reject(o(t))})}}if(!(55<t.version&&"autoGainControl"in n.mediaDevices.getSupportedConstraints())){var m=function(e,t,r){if(t in e&&!(r in e)){e[r]=e[t];delete e[t]}},l=n.mediaDevices.getUserMedia.bind(n.mediaDevices);n.mediaDevices.getUserMedia=function(e){if("object"===_typeof(e)&&"object"===_typeof(e.audio)){e=JSON.parse(JSON.stringify(e));m(e.audio,"autoGainControl","mozAutoGainControl");m(e.audio,"noiseSuppression","mozNoiseSuppression")}return l(e)};if(i&&i.prototype.getSettings){var g=i.prototype.getSettings;i.prototype.getSettings=function(){var e=g.apply(this,arguments);m(e,"mozAutoGainControl","autoGainControl");m(e,"mozNoiseSuppression","noiseSuppression");return e}}if(i&&i.prototype.applyConstraints){var h=i.prototype.applyConstraints;i.prototype.applyConstraints=function(e){if("audio"===this.kind&&"object"===_typeof(e)){e=JSON.parse(JSON.stringify(e));m(e,"autoGainControl","mozAutoGainControl");m(e,"noiseSuppression","mozNoiseSuppression")}return h.apply(this,[e])}}}n.getUserMedia=function(e,a,i){if(44>t.version){return s(e,a,i)}r.deprecated("navigator.getUserMedia","navigator.mediaDevices.getUserMedia");n.mediaDevices.getUserMedia(e).then(a,i)}}},{"../utils":14}],13:[function(e,t){'use strict';var r=e("../utils");t.exports={shimLocalStreamsAPI:function shimLocalStreamsAPI(e){if("object"!==_typeof(e)||!e.RTCPeerConnection){return}if(!("getLocalStreams"in e.RTCPeerConnection.prototype)){e.RTCPeerConnection.prototype.getLocalStreams=function(){if(!this._localStreams){this._localStreams=[]}return this._localStreams}}if(!("getStreamById"in e.RTCPeerConnection.prototype)){e.RTCPeerConnection.prototype.getStreamById=function(e){var t=null;if(this._localStreams){this._localStreams.forEach(function(r){if(r.id===e){t=r}})}if(this._remoteStreams){this._remoteStreams.forEach(function(r){if(r.id===e){t=r}})}return t}}if(!("addStream"in e.RTCPeerConnection.prototype)){var t=e.RTCPeerConnection.prototype.addTrack;e.RTCPeerConnection.prototype.addStream=function(e){if(!this._localStreams){this._localStreams=[]}if(-1===this._localStreams.indexOf(e)){this._localStreams.push(e)}var r=this;e.getTracks().forEach(function(a){t.call(r,a,e)})};e.RTCPeerConnection.prototype.addTrack=function(e,r){if(r){if(!this._localStreams){this._localStreams=[r]}else if(-1===this._localStreams.indexOf(r)){this._localStreams.push(r)}}return t.call(this,e,r)}}if(!("removeStream"in e.RTCPeerConnection.prototype)){e.RTCPeerConnection.prototype.removeStream=function(e){if(!this._localStreams){this._localStreams=[]}var t=this._localStreams.indexOf(e);if(-1===t){return}this._localStreams.splice(t,1);var r=this,a=e.getTracks();this.getSenders().forEach(function(e){if(-1!==a.indexOf(e.track)){r.removeTrack(e)}})}}},shimRemoteStreamsAPI:function shimRemoteStreamsAPI(e){if("object"!==_typeof(e)||!e.RTCPeerConnection){return}if(!("getRemoteStreams"in e.RTCPeerConnection.prototype)){e.RTCPeerConnection.prototype.getRemoteStreams=function(){return this._remoteStreams?this._remoteStreams:[]}}if(!("onaddstream"in e.RTCPeerConnection.prototype)){Object.defineProperty(e.RTCPeerConnection.prototype,"onaddstream",{get:function get(){return this._onaddstream},set:function set(e){if(this._onaddstream){this.removeEventListener("addstream",this._onaddstream)}this.addEventListener("addstream",this._onaddstream=e)}});var t=e.RTCPeerConnection.prototype.setRemoteDescription;e.RTCPeerConnection.prototype.setRemoteDescription=function(){var e=this;if(!this._onaddstreampoly){this.addEventListener("track",this._onaddstreampoly=function(t){t.streams.forEach(function(t){if(!e._remoteStreams){e._remoteStreams=[]}if(0<=e._remoteStreams.indexOf(t)){return}e._remoteStreams.push(t);var r=new Event("addstream");r.stream=t;e.dispatchEvent(r)})})}return t.apply(e,arguments)}}},shimCallbacksAPI:function shimCallbacksAPI(e){if("object"!==_typeof(e)||!e.RTCPeerConnection){return}var t=e.RTCPeerConnection.prototype,r=t.createOffer,a=t.createAnswer,n=t.setLocalDescription,i=t.setRemoteDescription,o=t.addIceCandidate;t.createOffer=function(e,t){var a=2<=arguments.length?arguments[2]:arguments[0],n=r.apply(this,[a]);if(!t){return n}n.then(e,t);return Promise.resolve()};t.createAnswer=function(e,t){var r=2<=arguments.length?arguments[2]:arguments[0],n=a.apply(this,[r]);if(!t){return n}n.then(e,t);return Promise.resolve()};var s=function(e,t,r){var a=n.apply(this,[e]);if(!r){return a}a.then(t,r);return Promise.resolve()};t.setLocalDescription=s;s=function(e,t,r){var a=i.apply(this,[e]);if(!r){return a}a.then(t,r);return Promise.resolve()};t.setRemoteDescription=s;s=function(e,t,r){var a=o.apply(this,[e]);if(!r){return a}a.then(t,r);return Promise.resolve()};t.addIceCandidate=s},shimGetUserMedia:function shimGetUserMedia(e){var t=e&&e.navigator;if(!t.getUserMedia){if(t.webkitGetUserMedia){t.getUserMedia=t.webkitGetUserMedia.bind(t)}else if(t.mediaDevices&&t.mediaDevices.getUserMedia){t.getUserMedia=function(e,r,a){t.mediaDevices.getUserMedia(e).then(r,a)}.bind(t)}}},shimRTCIceServerUrls:function shimRTCIceServerUrls(e){var t=e.RTCPeerConnection;e.RTCPeerConnection=function(e,a){if(e&&e.iceServers){for(var n=[],o=0,s;o<e.iceServers.length;o++){s=e.iceServers[o];if(!s.hasOwnProperty("urls")&&s.hasOwnProperty("url")){r.deprecated("RTCIceServer.url","RTCIceServer.urls");s=JSON.parse(JSON.stringify(s));s.urls=s.url;delete s.url;n.push(s)}else{n.push(e.iceServers[o])}}e.iceServers=n}return new t(e,a)};e.RTCPeerConnection.prototype=t.prototype;if("generateCertificate"in e.RTCPeerConnection){Object.defineProperty(e.RTCPeerConnection,"generateCertificate",{get:function get(){return t.generateCertificate}})}},shimTrackEventTransceiver:function shimTrackEventTransceiver(e){if("object"===_typeof(e)&&e.RTCPeerConnection&&"receiver"in e.RTCTrackEvent.prototype&&!e.RTCTransceiver){Object.defineProperty(e.RTCTrackEvent.prototype,"transceiver",{get:function get(){return{receiver:this.receiver}}})}},shimCreateOfferLegacy:function shimCreateOfferLegacy(e){var t=e.RTCPeerConnection.prototype.createOffer;e.RTCPeerConnection.prototype.createOffer=function(e){var r=this;if(e){if("undefined"!=typeof e.offerToReceiveAudio){e.offerToReceiveAudio=!!e.offerToReceiveAudio}var a=r.getTransceivers().find(function(e){return e.sender.track&&"audio"===e.sender.track.kind});if(!1===e.offerToReceiveAudio&&a){if("sendrecv"===a.direction){if(a.setDirection){a.setDirection("sendonly")}else{a.direction="sendonly"}}else if("recvonly"===a.direction){if(a.setDirection){a.setDirection("inactive")}else{a.direction="inactive"}}}else if(!0===e.offerToReceiveAudio&&!a){r.addTransceiver("audio")}if("undefined"!=typeof e.offerToReceiveVideo){e.offerToReceiveVideo=!!e.offerToReceiveVideo}var n=r.getTransceivers().find(function(e){return e.sender.track&&"video"===e.sender.track.kind});if(!1===e.offerToReceiveVideo&&n){if("sendrecv"===n.direction){n.setDirection("sendonly")}else if("recvonly"===n.direction){n.setDirection("inactive")}}else if(!0===e.offerToReceiveVideo&&!n){r.addTransceiver("video")}}return t.apply(r,arguments)}}}},{"../utils":14}],14:[function(e,t){'use strict';var a=!0,n=!0;function r(e,t,r){var a=e.match(t);return a&&a.length>=r&&parseInt(a[r],10)}t.exports={extractVersion:r,wrapPeerConnectionEvent:function(e,t,r){if(!e.RTCPeerConnection){return}var a=e.RTCPeerConnection.prototype,n=a.addEventListener;a.addEventListener=function(e,a){if(e!==t){return n.apply(this,arguments)}var i=function(t){var e=r(t);if(e){a(e)}};this._eventMap=this._eventMap||{};this._eventMap[a]=i;return n.apply(this,[e,i])};var i=a.removeEventListener;a.removeEventListener=function(e,r){if(e!==t||!this._eventMap||!this._eventMap[r]){return i.apply(this,arguments)}var a=this._eventMap[r];delete this._eventMap[r];return i.apply(this,[e,a])};Object.defineProperty(a,"on"+t,{get:function get(){return this["_on"+t]},set:function set(e){if(this["_on"+t]){this.removeEventListener(t,this["_on"+t]);delete this["_on"+t]}if(e){this.addEventListener(t,this["_on"+t]=e)}},enumerable:!0,configurable:!0})},disableLog:function disableLog(e){if("boolean"!=typeof e){return new Error("Argument type: "+_typeof(e)+". Please use a boolean.")}a=e;return e?"adapter.js logging disabled":"adapter.js logging enabled"},disableWarnings:function disableWarnings(e){if("boolean"!=typeof e){return new Error("Argument type: "+_typeof(e)+". Please use a boolean.")}n=!e;return"adapter.js deprecation warnings "+(e?"disabled":"enabled")},log:function log(){if("object"===("undefined"==typeof window?"undefined":_typeof(window))){if(a){return}if("undefined"!=typeof console&&"function"==typeof console.log){console.log.apply(console,arguments)}}},deprecated:function deprecated(e,t){if(!n){return}console.warn(e+" is deprecated, please use "+t+" instead.")},detectBrowser:function detectBrowser(e){var t=e&&e.navigator,a={};a.browser=null;a.version=null;if("undefined"==typeof e||!e.navigator){a.browser="Not a browser.";return a}if(t.mozGetUserMedia){a.browser="firefox";a.version=r(t.userAgent,/Firefox\/(\d+)\./,1)}else if(t.webkitGetUserMedia){a.browser="chrome";a.version=r(t.userAgent,/Chrom(e|ium)\/(\d+)\./,2)}else if(t.mediaDevices&&t.userAgent.match(/Edge\/(\d+).(\d+)$/)){a.browser="edge";a.version=r(t.userAgent,/Edge\/(\d+).(\d+)$/,2)}else if(e.RTCPeerConnection&&t.userAgent.match(/AppleWebKit\/(\d+)\./)){a.browser="safari";a.version=r(t.userAgent,/AppleWebKit\/(\d+)\./,1)}else{a.browser="Not a supported browser.";return a}return a}}},{}]},{},[3])(3)});
+function _typeof2(e){if("function"==typeof Symbol&&"symbol"==typeof Symbol.iterator){_typeof2=function(e){return typeof e}}else{_typeof2=function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e}}return _typeof2(e)}define ("core/adapter",[],function(){return function d(c,e,t){function r(i,o){if(!e[i]){if(!c[i]){var s="function"==typeof require&&require;if(!o&&s)return s(i,!0);if(n)return n(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=e[i]={exports:{}};c[i][0].call(p.exports,function(t){var e=c[i][1][t];return r(e?e:t)},p,p.exports,d,c,e,t)}return e[i].exports}for(var n="function"==typeof require&&require,a=0;a<t.length;a++){r(t[a])}return r}({1:[function(e,t){'use strict';var r=e("./adapter_factory.js"),a=(0,r.adapterFactory)({window:window});t.exports=a},{"./adapter_factory.js":2}],2:[function(e,t,r){'use strict';Object.defineProperty(r,"__esModule",{value:!0});r.adapterFactory=function(){var e=0<arguments.length&&arguments[0]!==void 0?arguments[0]:{},t=e.window,r=1<arguments.length&&arguments[1]!==void 0?arguments[1]:{shimChrome:!0,shimFirefox:!0,shimEdge:!0,shimSafari:!0},a=i.log,n=i.detectBrowser(t),o={browserDetails:n,commonShim:g,extractVersion:i.extractVersion,disableLog:i.disableLog,disableWarnings:i.disableWarnings};switch(n.browser){case"chrome":if(!s||!s.shimPeerConnection||!r.shimChrome){a("Chrome shim is not included in this adapter release.");return o}a("adapter.js shimming chrome.");o.browserShim=s;s.shimGetUserMedia(t);s.shimMediaStream(t);s.shimPeerConnection(t);s.shimOnTrack(t);s.shimAddTrackRemoveTrack(t);s.shimGetSendersWithDtmf(t);s.shimGetStats(t);s.shimSenderReceiverGetStats(t);s.fixNegotiationNeeded(t);g.shimRTCIceCandidate(t);g.shimConnectionState(t);g.shimMaxMessageSize(t);g.shimSendThrowTypeError(t);g.removeAllowExtmapMixed(t);break;case"firefox":if(!l||!l.shimPeerConnection||!r.shimFirefox){a("Firefox shim is not included in this adapter release.");return o}a("adapter.js shimming firefox.");o.browserShim=l;l.shimGetUserMedia(t);l.shimPeerConnection(t);l.shimOnTrack(t);l.shimRemoveStream(t);l.shimSenderGetStats(t);l.shimReceiverGetStats(t);l.shimRTCDataChannel(t);l.shimAddTransceiver(t);l.shimCreateOffer(t);l.shimCreateAnswer(t);g.shimRTCIceCandidate(t);g.shimConnectionState(t);g.shimMaxMessageSize(t);g.shimSendThrowTypeError(t);break;case"edge":if(!c||!c.shimPeerConnection||!r.shimEdge){a("MS edge shim is not included in this adapter release.");return o}a("adapter.js shimming edge.");o.browserShim=c;c.shimGetUserMedia(t);c.shimGetDisplayMedia(t);c.shimPeerConnection(t);c.shimReplaceTrack(t);g.shimMaxMessageSize(t);g.shimSendThrowTypeError(t);break;case"safari":if(!f||!r.shimSafari){a("Safari shim is not included in this adapter release.");return o}a("adapter.js shimming safari.");o.browserShim=f;f.shimRTCIceServerUrls(t);f.shimCreateOfferLegacy(t);f.shimCallbacksAPI(t);f.shimLocalStreamsAPI(t);f.shimRemoteStreamsAPI(t);f.shimTrackEventTransceiver(t);f.shimGetUserMedia(t);g.shimRTCIceCandidate(t);g.shimMaxMessageSize(t);g.shimSendThrowTypeError(t);g.removeAllowExtmapMixed(t);break;default:a("Unsupported browser!");break;}return o};var n=e("./utils"),i=a(n),o=e("./chrome/chrome_shim"),s=a(o),d=e("./edge/edge_shim"),c=a(d),p=e("./firefox/firefox_shim"),l=a(p),m=e("./safari/safari_shim"),f=a(m),h=e("./common_shim"),g=a(h);function a(e){if(e&&e.__esModule){return e}else{var t={};if(null!=e){for(var r in e){if(Object.prototype.hasOwnProperty.call(e,r))t[r]=e[r]}}t.default=e;return t}}},{"./chrome/chrome_shim":3,"./common_shim":6,"./edge/edge_shim":7,"./firefox/firefox_shim":11,"./safari/safari_shim":14,"./utils":15}],3:[function(e,t,r){'use strict';Object.defineProperty(r,"__esModule",{value:!0});r.shimGetDisplayMedia=r.shimGetUserMedia=void 0;var d="function"==typeof Symbol&&"symbol"===_typeof2(Symbol.iterator)?function(e){return _typeof2(e)}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":_typeof2(e)},c=e("./getusermedia");Object.defineProperty(r,"shimGetUserMedia",{enumerable:!0,get:function(){return c.shimGetUserMedia}});var p=e("./getdisplaymedia");Object.defineProperty(r,"shimGetDisplayMedia",{enumerable:!0,get:function(){return p.shimGetDisplayMedia}});r.shimMediaStream=function(e){e.MediaStream=e.MediaStream||e.webkitMediaStream};r.shimOnTrack=n;r.shimGetSendersWithDtmf=i;r.shimGetStats=function(e){if(!e.RTCPeerConnection){return}var t=e.RTCPeerConnection.prototype.getStats;e.RTCPeerConnection.prototype.getStats=function(){var e=this,r=Array.prototype.slice.call(arguments),a=r[0],n=r[1],i=r[2];if(0<arguments.length&&"function"==typeof a){return t.apply(this,arguments)}if(0===t.length&&(0===arguments.length||"function"!=typeof a)){return t.apply(this,[])}var o=function(e){var t={},r=e.result();r.forEach(function(e){var r={id:e.id,timestamp:e.timestamp,type:{localcandidate:"local-candidate",remotecandidate:"remote-candidate"}[e.type]||e.type};e.names().forEach(function(t){r[t]=e.stat(t)});t[r.id]=r});return t},s=function(e){return new Map(Object.keys(e).map(function(t){return[t,e[t]]}))};if(2<=arguments.length){var d=function(e){n(s(o(e)))};return t.apply(this,[d,a])}return new Promise(function(r,a){t.apply(e,[function(e){r(s(o(e)))},a])}).then(n,i)}};r.shimSenderReceiverGetStats=o;r.shimAddTrackRemoveTrackWithNative=s;r.shimAddTrackRemoveTrack=function(e){if(!e.RTCPeerConnection){return}var n=m.detectBrowser(e);if(e.RTCPeerConnection.prototype.addTrack&&65<=n.version){return s(e)}var i=e.RTCPeerConnection.prototype.getLocalStreams;e.RTCPeerConnection.prototype.getLocalStreams=function(){var e=this,t=i.apply(this);this._reverseStreams=this._reverseStreams||{};return t.map(function(t){return e._reverseStreams[t.id]})};var o=e.RTCPeerConnection.prototype.addStream;e.RTCPeerConnection.prototype.addStream=function(t){var r=this;this._streams=this._streams||{};this._reverseStreams=this._reverseStreams||{};t.getTracks().forEach(function(e){var t=r.getSenders().find(function(t){return t.track===e});if(t){throw new DOMException("Track already exists.","InvalidAccessError")}});if(!this._reverseStreams[t.id]){var a=new e.MediaStream(t.getTracks());this._streams[t.id]=a;this._reverseStreams[a.id]=t;t=a}o.apply(this,[t])};var d=e.RTCPeerConnection.prototype.removeStream;e.RTCPeerConnection.prototype.removeStream=function(e){this._streams=this._streams||{};this._reverseStreams=this._reverseStreams||{};d.apply(this,[this._streams[e.id]||e]);delete this._reverseStreams[this._streams[e.id]?this._streams[e.id].id:e.id];delete this._streams[e.id]};e.RTCPeerConnection.prototype.addTrack=function(r,a){var n=this;if("closed"===this.signalingState){throw new DOMException("The RTCPeerConnection's signalingState is 'closed'.","InvalidStateError")}var i=[].slice.call(arguments,1);if(1!==i.length||!i[0].getTracks().find(function(e){return e===r})){throw new DOMException("The adapter.js addTrack polyfill only supports a single  stream which is associated with the specified track.","NotSupportedError")}var o=this.getSenders().find(function(e){return e.track===r});if(o){throw new DOMException("Track already exists.","InvalidAccessError")}this._streams=this._streams||{};this._reverseStreams=this._reverseStreams||{};var s=this._streams[a.id];if(s){s.addTrack(r);Promise.resolve().then(function(){n.dispatchEvent(new Event("negotiationneeded"))})}else{var d=new e.MediaStream([r]);this._streams[a.id]=d;this._reverseStreams[d.id]=a;this.addStream(d)}return this.getSenders().find(function(e){return e.track===r})};function t(e,t){var r=t.sdp;Object.keys(e._reverseStreams||[]).forEach(function(t){var a=e._reverseStreams[t],n=e._streams[a.id];r=r.replace(new RegExp(n.id,"g"),a.id)});return new RTCSessionDescription({type:t.type,sdp:r})}function r(e,t){var r=t.sdp;Object.keys(e._reverseStreams||[]).forEach(function(t){var a=e._reverseStreams[t],n=e._streams[a.id];r=r.replace(new RegExp(a.id,"g"),n.id)});return new RTCSessionDescription({type:t.type,sdp:r})}["createOffer","createAnswer"].forEach(function(r){var n=e.RTCPeerConnection.prototype[r],i=a({},r,function(){var e=this,r=arguments,a=arguments.length&&"function"==typeof arguments[0];if(a){return n.apply(this,[function(a){var n=t(e,a);r[0].apply(null,[n])},function(e){if(r[1]){r[1].apply(null,e)}},arguments[2]])}return n.apply(this,arguments).then(function(r){return t(e,r)})});e.RTCPeerConnection.prototype[r]=i[r]});var c=e.RTCPeerConnection.prototype.setLocalDescription;e.RTCPeerConnection.prototype.setLocalDescription=function(){if(!arguments.length||!arguments[0].type){return c.apply(this,arguments)}arguments[0]=r(this,arguments[0]);return c.apply(this,arguments)};var p=Object.getOwnPropertyDescriptor(e.RTCPeerConnection.prototype,"localDescription");Object.defineProperty(e.RTCPeerConnection.prototype,"localDescription",{get:function(){var e=p.get.apply(this);if(""===e.type){return e}return t(this,e)}});e.RTCPeerConnection.prototype.removeTrack=function(e){var t=this;if("closed"===this.signalingState){throw new DOMException("The RTCPeerConnection's signalingState is 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t={};Object.keys(e).forEach(function(n){if("require"===n||"advanced"===n||"mediaSource"===n){return}var i="object"===a(e[n])?e[n]:{ideal:e[n]};if(i.exact!==void 0&&"number"==typeof i.exact){i.min=i.max=i.exact}var r=function(e,t){if(e){return e+t.charAt(0).toUpperCase()+t.slice(1)}return"deviceId"===t?"sourceId":t};if(i.ideal!==void 0){t.optional=t.optional||[];var o={};if("number"==typeof i.ideal){o[r("min",n)]=i.ideal;t.optional.push(o);o={};o[r("max",n)]=i.ideal;t.optional.push(o)}else{o[r("",n)]=i.ideal;t.optional.push(o)}}if(i.exact!==void 0&&"number"!=typeof i.exact){t.mandatory=t.mandatory||{};t.mandatory[r("",n)]=i.exact}else{["min","max"].forEach(function(e){if(i[e]!==void 0){t.mandatory=t.mandatory||{};t.mandatory[r(e,n)]=i[e]}})}});if(e.advanced){t.optional=(t.optional||[]).concat(e.advanced)}return t},s=function(e,i){if(61<=r.version){return i(e)}e=JSON.parse(JSON.stringify(e));if(e&&"object"===a(e.audio)){var s=function(e,t,r){if(t in e&&!(r in e)){e[r]=e[t];delete 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e.label.toLowerCase().includes(t)})});if(!r&&t.length&&p.includes("back")){r=t[t.length-1]}if(r){e.video.deviceId=d.exact?{exact:r.deviceId}:{ideal:r.deviceId}}e.video=n(e.video);o("chrome: "+JSON.stringify(e));return i(e)})}}e.video=n(e.video)}o("chrome: "+JSON.stringify(e));return i(e)},d=function(t){if(64<=r.version){return t}return{name:{PermissionDeniedError:"NotAllowedError",PermissionDismissedError:"NotAllowedError",InvalidStateError:"NotAllowedError",DevicesNotFoundError:"NotFoundError",ConstraintNotSatisfiedError:"OverconstrainedError",TrackStartError:"NotReadableError",MediaDeviceFailedDueToShutdown:"NotAllowedError",MediaDeviceKillSwitchOn:"NotAllowedError",TabCaptureError:"AbortError",ScreenCaptureError:"AbortError",DeviceCaptureError:"AbortError"}[t.name]||t.name,message:t.message,constraint:t.constraint||t.constraintName,toString:function(){return this.name+(this.message&&": 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Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":_typeof2(e)};r.shimRTCIceCandidate=a;r.shimMaxMessageSize=n;r.shimSendThrowTypeError=i;r.shimConnectionState=o;r.removeAllowExtmapMixed=function(e){if(!e.RTCPeerConnection){return}var t=l.detectBrowser(e);if("chrome"===t.browser&&71<=t.version){return}var r=e.RTCPeerConnection.prototype.setRemoteDescription;e.RTCPeerConnection.prototype.setRemoteDescription=function(e){if(e&&e.sdp&&-1!==e.sdp.indexOf("\na=extmap-allow-mixed")){e.sdp=e.sdp.split("\n").filter(function(e){return"a=extmap-allow-mixed"!==e.trim()}).join("\n")}return r.apply(this,arguments)}};var d=e("sdp"),c=function(e){return e&&e.__esModule?e:{default:e}}(d),p=e("./utils"),l=function(e){if(e&&e.__esModule){return e}else{var t={};if(null!=e){for(var r in e){if(Object.prototype.hasOwnProperty.call(e,r))t[r]=e[r]}}t.default=e;return t}}(p);function a(t){if(!t.RTCIceCandidate||t.RTCIceCandidate&&"foundation"in t.RTCIceCandidate.prototype){return}var r=t.RTCIceCandidate;t.RTCIceCandidate=function(e){if("object"===("undefined"==typeof e?"undefined":s(e))&&e.candidate&&0===e.candidate.indexOf("a=")){e=JSON.parse(JSON.stringify(e));e.candidate=e.candidate.substr(2)}if(e.candidate&&e.candidate.length){var t=new r(e),a=c.default.parseCandidate(e.candidate),n=Object.assign(t,a);n.toJSON=function(){return{candidate:n.candidate,sdpMid:n.sdpMid,sdpMLineIndex:n.sdpMLineIndex,usernameFragment:n.usernameFragment}};return n}return new r(e)};t.RTCIceCandidate.prototype=r.prototype;l.wrapPeerConnectionEvent(t,"icecandidate",function(r){if(r.candidate){Object.defineProperty(r,"candidate",{value:new t.RTCIceCandidate(r.candidate),writable:"false"})}return r})}function n(e){if(!e.RTCPeerConnection){return}var t=l.detectBrowser(e);if(!("sctp"in e.RTCPeerConnection.prototype)){Object.defineProperty(e.RTCPeerConnection.prototype,"sctp",{get:function(){return"undefined"==typeof this._sctp?null:this._sctp}})}var r=function(e){if(!e||!e.sdp){return!1}var t=c.default.splitSections(e.sdp);t.shift();return t.some(function(e){var t=c.default.parseMLine(e);return t&&"application"===t.kind&&-1!==t.protocol.indexOf("SCTP")})},a=function(e){var t=e.sdp.match(/mozilla...THIS_IS_SDPARTA-(\d+)/);if(null===t||2>t.length){return-1}var r=parseInt(t[1],10);return r!==r?-1:r},n=function(e){var r=65536;if("firefox"===t.browser){if(57>t.version){if(-1===e){r=16384}else{r=2147483637}}else if(60>t.version){r=57===t.version?65535:65536}else{r=2147483637}}return r},i=function(e,r){var a=65536;if("firefox"===t.browser&&57===t.version){a=65535}var n=c.default.matchPrefix(e.sdp,"a=max-message-size:");if(0<n.length){a=parseInt(n[0].substr(19),10)}else if("firefox"===t.browser&&-1!==r){a=2147483637}return a},o=e.RTCPeerConnection.prototype.setRemoteDescription;e.RTCPeerConnection.prototype.setRemoteDescription=function(){this._sctp=null;if("chrome"===t.browser&&76<=t.version){var e=this.getConfiguration(),s=e.sdpSemantics;if("plan-b"===s){Object.defineProperty(this,"sctp",{get:function(){return"undefined"==typeof this._sctp?null:this._sctp},enumerable:!0,configurable:!0})}}if(r(arguments[0])){var d=a(arguments[0]),c=n(d),p=i(arguments[0],d),l=void 0;if(0===c&&0===p){l=Number.POSITIVE_INFINITY}else if(0===c||0===p){l=Math.max(c,p)}else{l=Math.min(c,p)}var m={};Object.defineProperty(m,"maxMessageSize",{get:function(){return l}});this._sctp=m}return o.apply(this,arguments)}}function i(e){if(!(e.RTCPeerConnection&&"createDataChannel"in e.RTCPeerConnection.prototype)){return}function t(e,t){var r=e.send;e.send=function(){var a=arguments[0],n=a.length||a.size||a.byteLength;if("open"===e.readyState&&t.sctp&&n>t.sctp.maxMessageSize){throw new TypeError("Message too large (can send a maximum of "+t.sctp.maxMessageSize+" bytes)")}return r.apply(e,arguments)}}var r=e.RTCPeerConnection.prototype.createDataChannel;e.RTCPeerConnection.prototype.createDataChannel=function(){var e=r.apply(this,arguments);t(e,this);return e};l.wrapPeerConnectionEvent(e,"datachannel",function(r){t(r.channel,r.target);return r})}function o(e){if(!e.RTCPeerConnection||"connectionState"in e.RTCPeerConnection.prototype){return}var t=e.RTCPeerConnection.prototype;Object.defineProperty(t,"connectionState",{get:function(){return{completed:"connected",checking:"connecting"}[this.iceConnectionState]||this.iceConnectionState},enumerable:!0,configurable:!0});Object.defineProperty(t,"onconnectionstatechange",{get:function(){return this._onconnectionstatechange||null},set:function(e){if(this._onconnectionstatechange){this.removeEventListener("connectionstatechange",this._onconnectionstatechange);delete 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this["_on"+t]}if(e){this.addEventListener(t,this["_on"+t]=e)}},enumerable:!0,configurable:!0})};r.disableLog=function(e){if("boolean"!=typeof e){return new Error("Argument type: "+("undefined"==typeof e?"undefined":l(e))+". Please use a boolean.")}m=e;return e?"adapter.js logging disabled":"adapter.js logging enabled"};r.disableWarnings=function(e){if("boolean"!=typeof e){return new Error("Argument type: "+("undefined"==typeof e?"undefined":l(e))+". Please use a boolean.")}f=!e;return"adapter.js deprecation warnings "+(e?"disabled":"enabled")};r.log=i;r.deprecated=o;r.detectBrowser=s;r.compactObject=c;r.walkStats=p;r.filterStats=function(e,t,r){var a=r?"outbound-rtp":"inbound-rtp",n=new Map;if(null===t){return n}var i=[];e.forEach(function(e){if("track"===e.type&&e.trackIdentifier===t.id){i.push(e)}});i.forEach(function(t){e.forEach(function(r){if(r.type===a&&r.trackId===t.id){p(e,r,n)}})});return n};function a(e,t,r){if(t in e){Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0})}else{e[t]=r}return e}var m=!0,f=!0;function n(e,t,r){var a=e.match(t);return a&&a.length>=r&&parseInt(a[r],10)}function i(){if("object"===("undefined"==typeof window?"undefined":l(window))){if(m){return}if("undefined"!=typeof console&&"function"==typeof console.log){console.log.apply(console,arguments)}}}function o(e,t){if(!f){return}console.warn(e+" is deprecated, please use "+t+" instead.")}function s(e){var t=e.navigator,r={browser:null,version:null};if("undefined"==typeof e||!e.navigator){r.browser="Not a browser.";return r}if(t.mozGetUserMedia){r.browser="firefox";r.version=n(t.userAgent,/Firefox\/(\d+)\./,1)}else if(t.webkitGetUserMedia||!1===e.isSecureContext&&e.webkitRTCPeerConnection&&!e.RTCIceGatherer){r.browser="chrome";r.version=n(t.userAgent,/Chrom(e|ium)\/(\d+)\./,2)}else if(t.mediaDevices&&t.userAgent.match(/Edge\/(\d+).(\d+)$/)){r.browser="edge";r.version=n(t.userAgent,/Edge\/(\d+).(\d+)$/,2)}else if(e.RTCPeerConnection&&t.userAgent.match(/AppleWebKit\/(\d+)\./)){r.browser="safari";r.version=n(t.userAgent,/AppleWebKit\/(\d+)\./,1);r.supportsUnifiedPlan=e.RTCRtpTransceiver&&"currentDirection"in e.RTCRtpTransceiver.prototype}else{r.browser="Not a supported browser.";return r}return r}function d(e){return"[object Object]"===Object.prototype.toString.call(e)}function c(e){if(!d(e)){return e}return Object.keys(e).reduce(function(t,r){var n=d(e[r]),i=n?c(e[r]):e[r],o=n&&!Object.keys(i).length;if(i===void 0||o){return t}return Object.assign(t,a({},r,i))},{})}function p(e,t,r){if(!t||r.has(t.id)){return}r.set(t.id,t);Object.keys(t).forEach(function(a){if(a.endsWith("Id")){p(e,e.get(t[a]),r)}else if(a.endsWith("Ids")){t[a].forEach(function(t){p(e,e.get(t),r)})}})}},{}],16:[function(e,t){'use strict';var c=e("sdp");function r(e){return{inboundrtp:"inbound-rtp",outboundrtp:"outbound-rtp",candidatepair:"candidate-pair",localcandidate:"local-candidate",remotecandidate:"remote-candidate"}[e.type]||e.type}function a(e,t,r,a,n){var i=c.writeRtpDescription(e.kind,t);i+=c.writeIceParameters(e.iceGatherer.getLocalParameters());i+=c.writeDtlsParameters(e.dtlsTransport.getLocalParameters(),"offer"===r?"actpass":n||"active");i+="a=mid:"+e.mid+"\r\n";if(e.rtpSender&&e.rtpReceiver){i+="a=sendrecv\r\n"}else if(e.rtpSender){i+="a=sendonly\r\n"}else if(e.rtpReceiver){i+="a=recvonly\r\n"}else{i+="a=inactive\r\n"}if(e.rtpSender){var o=e.rtpSender._initialTrackId||e.rtpSender.track.id;e.rtpSender._initialTrackId=o;var s="msid:"+(a?a.id:"-")+" "+o+"\r\n";i+="a="+s;i+="a=ssrc:"+e.sendEncodingParameters[0].ssrc+" "+s;if(e.sendEncodingParameters[0].rtx){i+="a=ssrc:"+e.sendEncodingParameters[0].rtx.ssrc+" "+s;i+="a=ssrc-group:FID "+e.sendEncodingParameters[0].ssrc+" "+e.sendEncodingParameters[0].rtx.ssrc+"\r\n"}}i+="a=ssrc:"+e.sendEncodingParameters[0].ssrc+" cname:"+c.localCName+"\r\n";if(e.rtpSender&&e.sendEncodingParameters[0].rtx){i+="a=ssrc:"+e.sendEncodingParameters[0].rtx.ssrc+" cname:"+c.localCName+"\r\n"}return i}function n(e,t){var r=!1;e=JSON.parse(JSON.stringify(e));return e.filter(function(e){if(e&&(e.urls||e.url)){var a=e.urls||e.url;if(e.url&&!e.urls){console.warn("RTCIceServer.url is deprecated! Use urls instead.")}var n="string"==typeof a;if(n){a=[a]}a=a.filter(function(e){var a=0===e.indexOf("turn:")&&-1!==e.indexOf("transport=udp")&&-1===e.indexOf("turn:[")&&!r;if(a){r=!0;return!0}return 0===e.indexOf("stun:")&&14393<=t&&-1===e.indexOf("?transport=udp")});delete e.url;e.urls=n?a[0]:a;return!!a.length}})}function i(e,t){var r={codecs:[],headerExtensions:[],fecMechanisms:[]},a=function(e,t){e=parseInt(e,10);for(var r=0;r<t.length;r++){if(t[r].payloadType===e||t[r].preferredPayloadType===e){return t[r]}}},n=function(e,t,r,n){var i=a(e.parameters.apt,r),o=a(t.parameters.apt,n);return i&&o&&i.name.toLowerCase()===o.name.toLowerCase()};e.codecs.forEach(function(a){for(var o=0,s;o<t.codecs.length;o++){s=t.codecs[o];if(a.name.toLowerCase()===s.name.toLowerCase()&&a.clockRate===s.clockRate){if("rtx"===a.name.toLowerCase()&&a.parameters&&s.parameters.apt){if(!n(a,s,e.codecs,t.codecs)){continue}}s=JSON.parse(JSON.stringify(s));s.numChannels=Math.min(a.numChannels,s.numChannels);r.codecs.push(s);s.rtcpFeedback=s.rtcpFeedback.filter(function(e){for(var t=0;t<a.rtcpFeedback.length;t++){if(a.rtcpFeedback[t].type===e.type&&a.rtcpFeedback[t].parameter===e.parameter){return!0}}return!1});break}}});e.headerExtensions.forEach(function(e){for(var a=0,n;a<t.headerExtensions.length;a++){n=t.headerExtensions[a];if(e.uri===n.uri){r.headerExtensions.push(n);break}}});return r}function o(e,t,r){return-1!=={offer:{setLocalDescription:["stable","have-local-offer"],setRemoteDescription:["stable","have-remote-offer"]},answer:{setLocalDescription:["have-remote-offer","have-local-pranswer"],setRemoteDescription:["have-local-offer","have-remote-pranswer"]}}[t][e].indexOf(r)}function s(e,t){var r=e.getRemoteCandidates().find(function(e){return t.foundation===e.foundation&&t.ip===e.ip&&t.port===e.port&&t.priority===e.priority&&t.protocol===e.protocol&&t.type===e.type});if(!r){e.addRemoteCandidate(t)}return!r}function d(t,r){var a=new Error(r);a.name=t;a.code={NotSupportedError:9,InvalidStateError:11,InvalidAccessError:15,TypeError:void 0,OperationError:void 0}[t];return a}t.exports=function(e,t){function p(t,r){r.addTrack(t);r.dispatchEvent(new e.MediaStreamTrackEvent("addtrack",{track:t}))}function l(t,r){r.removeTrack(t);r.dispatchEvent(new e.MediaStreamTrackEvent("removetrack",{track:t}))}function m(t,r,a,n){var i=new Event("track");i.track=r;i.receiver=a;i.transceiver={receiver:a};i.streams=n;e.setTimeout(function(){t._dispatchEvent("track",i)})}var f=function(r){var a=this,o=document.createDocumentFragment();["addEventListener","removeEventListener","dispatchEvent"].forEach(function(e){a[e]=o[e].bind(o)});this.canTrickleIceCandidates=null;this.needNegotiation=!1;this.localStreams=[];this.remoteStreams=[];this._localDescription=null;this._remoteDescription=null;this.signalingState="stable";this.iceConnectionState="new";this.connectionState="new";this.iceGatheringState="new";r=JSON.parse(JSON.stringify(r||{}));this.usingBundle="max-bundle"===r.bundlePolicy;if("negotiate"===r.rtcpMuxPolicy){throw d("NotSupportedError","rtcpMuxPolicy 'negotiate' is not supported")}else if(!r.rtcpMuxPolicy){r.rtcpMuxPolicy="require"}switch(r.iceTransportPolicy){case"all":case"relay":break;default:r.iceTransportPolicy="all";break;}switch(r.bundlePolicy){case"balanced":case"max-compat":case"max-bundle":break;default:r.bundlePolicy="balanced";break;}r.iceServers=n(r.iceServers||[],t);this._iceGatherers=[];if(r.iceCandidatePoolSize){for(var s=r.iceCandidatePoolSize;0<s;s--){this._iceGatherers.push(new e.RTCIceGatherer({iceServers:r.iceServers,gatherPolicy:r.iceTransportPolicy}))}}else{r.iceCandidatePoolSize=0}this._config=r;this.transceivers=[];this._sdpSessionId=c.generateSessionId();this._sdpSessionVersion=0;this._dtlsRole=void 0;this._isClosed=!1};Object.defineProperty(f.prototype,"localDescription",{configurable:!0,get:function get(){return this._localDescription}});Object.defineProperty(f.prototype,"remoteDescription",{configurable:!0,get:function get(){return this._remoteDescription}});f.prototype.onicecandidate=null;f.prototype.onaddstream=null;f.prototype.ontrack=null;f.prototype.onremovestream=null;f.prototype.onsignalingstatechange=null;f.prototype.oniceconnectionstatechange=null;f.prototype.onconnectionstatechange=null;f.prototype.onicegatheringstatechange=null;f.prototype.onnegotiationneeded=null;f.prototype.ondatachannel=null;f.prototype._dispatchEvent=function(e,t){if(this._isClosed){return}this.dispatchEvent(t);if("function"==typeof this["on"+e]){this["on"+e](t)}};f.prototype._emitGatheringStateChange=function(){var e=new Event("icegatheringstatechange");this._dispatchEvent("icegatheringstatechange",e)};f.prototype.getConfiguration=function(){return this._config};f.prototype.getLocalStreams=function(){return this.localStreams};f.prototype.getRemoteStreams=function(){return this.remoteStreams};f.prototype._createTransceiver=function(e,t){var r=0<this.transceivers.length,a={track:null,iceGatherer:null,iceTransport:null,dtlsTransport:null,localCapabilities:null,remoteCapabilities:null,rtpSender:null,rtpReceiver:null,kind:e,mid:null,sendEncodingParameters:null,recvEncodingParameters:null,stream:null,associatedRemoteMediaStreams:[],wantReceive:!0};if(this.usingBundle&&r){a.iceTransport=this.transceivers[0].iceTransport;a.dtlsTransport=this.transceivers[0].dtlsTransport}else{var n=this._createIceAndDtlsTransports();a.iceTransport=n.iceTransport;a.dtlsTransport=n.dtlsTransport}if(!t){this.transceivers.push(a)}return a};f.prototype.addTrack=function(t,r){if(this._isClosed){throw d("InvalidStateError","Attempted to call addTrack on a closed peerconnection.")}var a=this.transceivers.find(function(e){return e.track===t});if(a){throw d("InvalidAccessError","Track already exists.")}for(var n,o=0;o<this.transceivers.length;o++){if(!this.transceivers[o].track&&this.transceivers[o].kind===t.kind){n=this.transceivers[o]}}if(!n){n=this._createTransceiver(t.kind)}this._maybeFireNegotiationNeeded();if(-1===this.localStreams.indexOf(r)){this.localStreams.push(r)}n.track=t;n.stream=r;n.rtpSender=new e.RTCRtpSender(t,n.dtlsTransport);return n.rtpSender};f.prototype.addStream=function(e){var r=this;if(15025<=t){e.getTracks().forEach(function(t){r.addTrack(t,e)})}else{var a=e.clone();e.getTracks().forEach(function(e,t){var r=a.getTracks()[t];e.addEventListener("enabled",function(e){r.enabled=e.enabled})});a.getTracks().forEach(function(e){r.addTrack(e,a)})}};f.prototype.removeTrack=function(r){if(this._isClosed){throw d("InvalidStateError","Attempted to call removeTrack on a closed peerconnection.")}if(!(r instanceof e.RTCRtpSender)){throw new TypeError("Argument 1 of RTCPeerConnection.removeTrack does not implement interface RTCRtpSender.")}var a=this.transceivers.find(function(e){return e.rtpSender===r});if(!a){throw d("InvalidAccessError","Sender was not created by this connection.")}var n=a.stream;a.rtpSender.stop();a.rtpSender=null;a.track=null;a.stream=null;var i=this.transceivers.map(function(e){return e.stream});if(-1===i.indexOf(n)&&-1<this.localStreams.indexOf(n)){this.localStreams.splice(this.localStreams.indexOf(n),1)}this._maybeFireNegotiationNeeded()};f.prototype.removeStream=function(e){var t=this;e.getTracks().forEach(function(e){var r=t.getSenders().find(function(t){return t.track===e});if(r){t.removeTrack(r)}})};f.prototype.getSenders=function(){return this.transceivers.filter(function(e){return!!e.rtpSender}).map(function(e){return e.rtpSender})};f.prototype.getReceivers=function(){return this.transceivers.filter(function(e){return!!e.rtpReceiver}).map(function(e){return e.rtpReceiver})};f.prototype._createIceGatherer=function(t,r){var a=this;if(r&&0<t){return this.transceivers[0].iceGatherer}else if(this._iceGatherers.length){return this._iceGatherers.shift()}var n=new e.RTCIceGatherer({iceServers:this._config.iceServers,gatherPolicy:this._config.iceTransportPolicy});Object.defineProperty(n,"state",{value:"new",writable:!0});this.transceivers[t].bufferedCandidateEvents=[];this.transceivers[t].bufferCandidates=function(e){var r=!e.candidate||0===Object.keys(e.candidate).length;n.state=r?"completed":"gathering";if(null!==a.transceivers[t].bufferedCandidateEvents){a.transceivers[t].bufferedCandidateEvents.push(e)}};n.addEventListener("localcandidate",this.transceivers[t].bufferCandidates);return n};f.prototype._gather=function(t,r){var a=this,n=this.transceivers[r].iceGatherer;if(n.onlocalcandidate){return}var i=this.transceivers[r].bufferedCandidateEvents;this.transceivers[r].bufferedCandidateEvents=null;n.removeEventListener("localcandidate",this.transceivers[r].bufferCandidates);n.onlocalcandidate=function(e){if(a.usingBundle&&0<r){return}var i=new Event("icecandidate");i.candidate={sdpMid:t,sdpMLineIndex:r};var o=e.candidate,s=!o||0===Object.keys(o).length;if(s){if("new"===n.state||"gathering"===n.state){n.state="completed"}}else{if("new"===n.state){n.state="gathering"}o.component=1;o.ufrag=n.getLocalParameters().usernameFragment;var d=c.writeCandidate(o);i.candidate=Object.assign(i.candidate,c.parseCandidate(d));i.candidate.candidate=d;i.candidate.toJSON=function(){return{candidate:i.candidate.candidate,sdpMid:i.candidate.sdpMid,sdpMLineIndex:i.candidate.sdpMLineIndex,usernameFragment:i.candidate.usernameFragment}}}var p=c.getMediaSections(a._localDescription.sdp);if(!s){p[i.candidate.sdpMLineIndex]+="a="+i.candidate.candidate+"\r\n"}else{p[i.candidate.sdpMLineIndex]+="a=end-of-candidates\r\n"}a._localDescription.sdp=c.getDescription(a._localDescription.sdp)+p.join("");var l=a.transceivers.every(function(e){return e.iceGatherer&&"completed"===e.iceGatherer.state});if("gathering"!==a.iceGatheringState){a.iceGatheringState="gathering";a._emitGatheringStateChange()}if(!s){a._dispatchEvent("icecandidate",i)}if(l){a._dispatchEvent("icecandidate",new Event("icecandidate"));a.iceGatheringState="complete";a._emitGatheringStateChange()}};e.setTimeout(function(){i.forEach(function(t){n.onlocalcandidate(t)})},0)};f.prototype._createIceAndDtlsTransports=function(){var t=this,r=new e.RTCIceTransport(null);r.onicestatechange=function(){t._updateIceConnectionState();t._updateConnectionState()};var a=new e.RTCDtlsTransport(r);a.ondtlsstatechange=function(){t._updateConnectionState()};a.onerror=function(){Object.defineProperty(a,"state",{value:"failed",writable:!0});t._updateConnectionState()};return{iceTransport:r,dtlsTransport:a}};f.prototype._disposeIceAndDtlsTransports=function(e){var t=this.transceivers[e].iceGatherer;if(t){delete t.onlocalcandidate;delete this.transceivers[e].iceGatherer}var r=this.transceivers[e].iceTransport;if(r){delete r.onicestatechange;delete this.transceivers[e].iceTransport}var a=this.transceivers[e].dtlsTransport;if(a){delete a.ondtlsstatechange;delete a.onerror;delete this.transceivers[e].dtlsTransport}};f.prototype._transceive=function(e,r,a){var n=i(e.localCapabilities,e.remoteCapabilities);if(r&&e.rtpSender){n.encodings=e.sendEncodingParameters;n.rtcp={cname:c.localCName,compound:e.rtcpParameters.compound};if(e.recvEncodingParameters.length){n.rtcp.ssrc=e.recvEncodingParameters[0].ssrc}e.rtpSender.send(n)}if(a&&e.rtpReceiver&&0<n.codecs.length){if("video"===e.kind&&e.recvEncodingParameters&&15019>t){e.recvEncodingParameters.forEach(function(e){delete e.rtx})}if(e.recvEncodingParameters.length){n.encodings=e.recvEncodingParameters}else{n.encodings=[{}]}n.rtcp={compound:e.rtcpParameters.compound};if(e.rtcpParameters.cname){n.rtcp.cname=e.rtcpParameters.cname}if(e.sendEncodingParameters.length){n.rtcp.ssrc=e.sendEncodingParameters[0].ssrc}e.rtpReceiver.receive(n)}};f.prototype.setLocalDescription=function(e){var t=this;if(-1===["offer","answer"].indexOf(e.type)){return Promise.reject(d("TypeError","Unsupported type \""+e.type+"\""))}if(!o("setLocalDescription",e.type,t.signalingState)||t._isClosed){return Promise.reject(d("InvalidStateError","Can not set local "+e.type+" in state "+t.signalingState))}var r,a;if("offer"===e.type){r=c.splitSections(e.sdp);a=r.shift();r.forEach(function(e,r){var a=c.parseRtpParameters(e);t.transceivers[r].localCapabilities=a});t.transceivers.forEach(function(e,r){t._gather(e.mid,r)})}else if("answer"===e.type){r=c.splitSections(t._remoteDescription.sdp);a=r.shift();var n=0<c.matchPrefix(a,"a=ice-lite").length;r.forEach(function(e,r){var o=t.transceivers[r],s=o.iceGatherer,d=o.iceTransport,p=o.dtlsTransport,l=o.localCapabilities,m=o.remoteCapabilities,f=c.isRejected(e)&&0===c.matchPrefix(e,"a=bundle-only").length;if(!f&&!o.rejected){var h=c.getIceParameters(e,a),g=c.getDtlsParameters(e,a);if(n){g.role="server"}if(!t.usingBundle||0===r){t._gather(o.mid,r);if("new"===d.state){d.start(s,h,n?"controlling":"controlled")}if("new"===p.state){p.start(g)}}var u=i(l,m);t._transceive(o,0<u.codecs.length,!1)}})}t._localDescription={type:e.type,sdp:e.sdp};if("offer"===e.type){t._updateSignalingState("have-local-offer")}else{t._updateSignalingState("stable")}return Promise.resolve()};f.prototype.setRemoteDescription=function(r){var a=this;if(-1===["offer","answer"].indexOf(r.type)){return Promise.reject(d("TypeError","Unsupported type \""+r.type+"\""))}if(!o("setRemoteDescription",r.type,a.signalingState)||a._isClosed){return Promise.reject(d("InvalidStateError","Can not set remote "+r.type+" in state "+a.signalingState))}var n={};a.remoteStreams.forEach(function(e){n[e.id]=e});var f=[],h=c.splitSections(r.sdp),g=h.shift(),u=0<c.matchPrefix(g,"a=ice-lite").length,y=0<c.matchPrefix(g,"a=group:BUNDLE ").length;a.usingBundle=y;var v=c.matchPrefix(g,"a=ice-options:")[0];if(v){a.canTrickleIceCandidates=0<=v.substr(14).split(" ").indexOf("trickle")}else{a.canTrickleIceCandidates=!1}h.forEach(function(o,d){var m=c.splitLines(o),h=c.getKind(o),v=c.isRejected(o)&&0===c.matchPrefix(o,"a=bundle-only").length,C=m[0].substr(2).split(" ")[2],T=c.getDirection(o,g),S=c.parseMsid(o),R=c.getMid(o)||c.generateIdentifier();if(v||"application"===h&&("DTLS/SCTP"===C||"UDP/DTLS/SCTP"===C)){a.transceivers[d]={mid:R,kind:h,protocol:C,rejected:!0};return}if(!v&&a.transceivers[d]&&a.transceivers[d].rejected){a.transceivers[d]=a._createTransceiver(h,!0)}var P,_,E,k,b,x,M,D,I,w=c.parseRtpParameters(o),L,G;if(!v){L=c.getIceParameters(o,g);G=c.getDtlsParameters(o,g);G.role="client"}M=c.parseRtpEncodingParameters(o);var j=c.parseRtcpParameters(o),O=0<c.matchPrefix(o,"a=end-of-candidates",g).length,A=c.matchPrefix(o,"a=candidate:").map(function(e){return c.parseCandidate(e)}).filter(function(e){return 1===e.component});if(("offer"===r.type||"answer"===r.type)&&!v&&y&&0<d&&a.transceivers[d]){a._disposeIceAndDtlsTransports(d);a.transceivers[d].iceGatherer=a.transceivers[0].iceGatherer;a.transceivers[d].iceTransport=a.transceivers[0].iceTransport;a.transceivers[d].dtlsTransport=a.transceivers[0].dtlsTransport;if(a.transceivers[d].rtpSender){a.transceivers[d].rtpSender.setTransport(a.transceivers[0].dtlsTransport)}if(a.transceivers[d].rtpReceiver){a.transceivers[d].rtpReceiver.setTransport(a.transceivers[0].dtlsTransport)}}if("offer"===r.type&&!v){P=a.transceivers[d]||a._createTransceiver(h);P.mid=R;if(!P.iceGatherer){P.iceGatherer=a._createIceGatherer(d,y)}if(A.length&&"new"===P.iceTransport.state){if(O&&(!y||0===d)){P.iceTransport.setRemoteCandidates(A)}else{A.forEach(function(e){s(P.iceTransport,e)})}}D=e.RTCRtpReceiver.getCapabilities(h);if(15019>t){D.codecs=D.codecs.filter(function(e){return"rtx"!==e.name})}x=P.sendEncodingParameters||[{ssrc:1001*(2*d+2)}];var U=!1;if("sendrecv"===T||"sendonly"===T){U=!P.rtpReceiver;b=P.rtpReceiver||new e.RTCRtpReceiver(P.dtlsTransport,h);if(U){var F;I=b.track;if(S&&"-"===S.stream){}else if(S){if(!n[S.stream]){n[S.stream]=new e.MediaStream;Object.defineProperty(n[S.stream],"id",{get:function get(){return S.stream}})}Object.defineProperty(I,"id",{get:function get(){return S.track}});F=n[S.stream]}else{if(!n.default){n.default=new e.MediaStream}F=n.default}if(F){p(I,F);P.associatedRemoteMediaStreams.push(F)}f.push([I,b,F])}}else if(P.rtpReceiver&&P.rtpReceiver.track){P.associatedRemoteMediaStreams.forEach(function(e){var t=e.getTracks().find(function(e){return e.id===P.rtpReceiver.track.id});if(t){l(t,e)}});P.associatedRemoteMediaStreams=[]}P.localCapabilities=D;P.remoteCapabilities=w;P.rtpReceiver=b;P.rtcpParameters=j;P.sendEncodingParameters=x;P.recvEncodingParameters=M;a._transceive(a.transceivers[d],!1,U)}else if("answer"===r.type&&!v){P=a.transceivers[d];_=P.iceGatherer;E=P.iceTransport;k=P.dtlsTransport;b=P.rtpReceiver;x=P.sendEncodingParameters;D=P.localCapabilities;a.transceivers[d].recvEncodingParameters=M;a.transceivers[d].remoteCapabilities=w;a.transceivers[d].rtcpParameters=j;if(A.length&&"new"===E.state){if((u||O)&&(!y||0===d)){E.setRemoteCandidates(A)}else{A.forEach(function(e){s(P.iceTransport,e)})}}if(!y||0===d){if("new"===E.state){E.start(_,L,"controlling")}if("new"===k.state){k.start(G)}}var N=i(P.localCapabilities,P.remoteCapabilities),z=N.codecs.filter(function(e){return"rtx"===e.name.toLowerCase()}).length;if(!z&&P.sendEncodingParameters[0].rtx){delete P.sendEncodingParameters[0].rtx}a._transceive(P,"sendrecv"===T||"recvonly"===T,"sendrecv"===T||"sendonly"===T);if(b&&("sendrecv"===T||"sendonly"===T)){I=b.track;if(S){if(!n[S.stream]){n[S.stream]=new e.MediaStream}p(I,n[S.stream]);f.push([I,b,n[S.stream]])}else{if(!n.default){n.default=new e.MediaStream}p(I,n.default);f.push([I,b,n.default])}}else{delete P.rtpReceiver}}});if(a._dtlsRole===void 0){a._dtlsRole="offer"===r.type?"active":"passive"}a._remoteDescription={type:r.type,sdp:r.sdp};if("offer"===r.type){a._updateSignalingState("have-remote-offer")}else{a._updateSignalingState("stable")}Object.keys(n).forEach(function(t){var r=n[t];if(r.getTracks().length){if(-1===a.remoteStreams.indexOf(r)){a.remoteStreams.push(r);var i=new Event("addstream");i.stream=r;e.setTimeout(function(){a._dispatchEvent("addstream",i)})}f.forEach(function(e){var t=e[0],n=e[1];if(r.id!==e[2].id){return}m(a,t,n,[r])})}});f.forEach(function(e){if(e[2]){return}m(a,e[0],e[1],[])});e.setTimeout(function(){if(!(a&&a.transceivers)){return}a.transceivers.forEach(function(e){if(e.iceTransport&&"new"===e.iceTransport.state&&0<e.iceTransport.getRemoteCandidates().length){console.warn("Timeout for addRemoteCandidate. Consider sending an end-of-candidates notification");e.iceTransport.addRemoteCandidate({})}})},4e3);return Promise.resolve()};f.prototype.close=function(){this.transceivers.forEach(function(e){if(e.iceTransport){e.iceTransport.stop()}if(e.dtlsTransport){e.dtlsTransport.stop()}if(e.rtpSender){e.rtpSender.stop()}if(e.rtpReceiver){e.rtpReceiver.stop()}});this._isClosed=!0;this._updateSignalingState("closed")};f.prototype._updateSignalingState=function(e){this.signalingState=e;var t=new Event("signalingstatechange");this._dispatchEvent("signalingstatechange",t)};f.prototype._maybeFireNegotiationNeeded=function(){var t=this;if("stable"!==this.signalingState||!0===this.needNegotiation){return}this.needNegotiation=!0;e.setTimeout(function(){if(t.needNegotiation){t.needNegotiation=!1;var e=new Event("negotiationneeded");t._dispatchEvent("negotiationneeded",e)}},0)};f.prototype._updateIceConnectionState=function(){var e,t={new:0,closed:0,checking:0,connected:0,completed:0,disconnected:0,failed:0};this.transceivers.forEach(function(e){if(e.iceTransport&&!e.rejected){t[e.iceTransport.state]++}});e="new";if(0<t.failed){e="failed"}else if(0<t.checking){e="checking"}else if(0<t.disconnected){e="disconnected"}else if(0<t.new){e="new"}else if(0<t.connected){e="connected"}else if(0<t.completed){e="completed"}if(e!==this.iceConnectionState){this.iceConnectionState=e;var r=new Event("iceconnectionstatechange");this._dispatchEvent("iceconnectionstatechange",r)}};f.prototype._updateConnectionState=function(){var e,t={new:0,closed:0,connecting:0,connected:0,completed:0,disconnected:0,failed:0};this.transceivers.forEach(function(e){if(e.iceTransport&&e.dtlsTransport&&!e.rejected){t[e.iceTransport.state]++;t[e.dtlsTransport.state]++}});t.connected+=t.completed;e="new";if(0<t.failed){e="failed"}else if(0<t.connecting){e="connecting"}else if(0<t.disconnected){e="disconnected"}else if(0<t.new){e="new"}else if(0<t.connected){e="connected"}if(e!==this.connectionState){this.connectionState=e;var r=new Event("connectionstatechange");this._dispatchEvent("connectionstatechange",r)}};f.prototype.createOffer=function(){var r=this;if(r._isClosed){return Promise.reject(d("InvalidStateError","Can not call createOffer after close"))}var n=r.transceivers.filter(function(e){return"audio"===e.kind}).length,i=r.transceivers.filter(function(e){return"video"===e.kind}).length,o=arguments[0];if(o){if(o.mandatory||o.optional){throw new TypeError("Legacy mandatory/optional constraints not supported.")}if(o.offerToReceiveAudio!==void 0){if(!0===o.offerToReceiveAudio){n=1}else if(!1===o.offerToReceiveAudio){n=0}else{n=o.offerToReceiveAudio}}if(o.offerToReceiveVideo!==void 0){if(!0===o.offerToReceiveVideo){i=1}else if(!1===o.offerToReceiveVideo){i=0}else{i=o.offerToReceiveVideo}}}r.transceivers.forEach(function(e){if("audio"===e.kind){n--;if(0>n){e.wantReceive=!1}}else if("video"===e.kind){i--;if(0>i){e.wantReceive=!1}}});while(0<n||0<i){if(0<n){r._createTransceiver("audio");n--}if(0<i){r._createTransceiver("video");i--}}var s=c.writeSessionBoilerplate(r._sdpSessionId,r._sdpSessionVersion++);r.transceivers.forEach(function(a,n){var i=a.track,o=a.kind,s=a.mid||c.generateIdentifier();a.mid=s;if(!a.iceGatherer){a.iceGatherer=r._createIceGatherer(n,r.usingBundle)}var d=e.RTCRtpSender.getCapabilities(o);if(15019>t){d.codecs=d.codecs.filter(function(e){return"rtx"!==e.name})}d.codecs.forEach(function(e){if("H264"===e.name&&e.parameters["level-asymmetry-allowed"]===void 0){e.parameters["level-asymmetry-allowed"]="1"}if(a.remoteCapabilities&&a.remoteCapabilities.codecs){a.remoteCapabilities.codecs.forEach(function(t){if(e.name.toLowerCase()===t.name.toLowerCase()&&e.clockRate===t.clockRate){e.preferredPayloadType=t.payloadType}})}});d.headerExtensions.forEach(function(e){var t=a.remoteCapabilities&&a.remoteCapabilities.headerExtensions||[];t.forEach(function(t){if(e.uri===t.uri){e.id=t.id}})});var p=a.sendEncodingParameters||[{ssrc:1001*(2*n+1)}];if(i){if(15019<=t&&"video"===o&&!p[0].rtx){p[0].rtx={ssrc:p[0].ssrc+1}}}if(a.wantReceive){a.rtpReceiver=new e.RTCRtpReceiver(a.dtlsTransport,o)}a.localCapabilities=d;a.sendEncodingParameters=p});if("max-compat"!==r._config.bundlePolicy){s+="a=group:BUNDLE "+r.transceivers.map(function(e){return e.mid}).join(" ")+"\r\n"}s+="a=ice-options:trickle\r\n";r.transceivers.forEach(function(e,t){s+=a(e,e.localCapabilities,"offer",e.stream,r._dtlsRole);s+="a=rtcp-rsize\r\n";if(e.iceGatherer&&"new"!==r.iceGatheringState&&(0===t||!r.usingBundle)){e.iceGatherer.getLocalCandidates().forEach(function(e){e.component=1;s+="a="+c.writeCandidate(e)+"\r\n"});if("completed"===e.iceGatherer.state){s+="a=end-of-candidates\r\n"}}});var p=new e.RTCSessionDescription({type:"offer",sdp:s});return Promise.resolve(p)};f.prototype.createAnswer=function(){var r=this;if(r._isClosed){return Promise.reject(d("InvalidStateError","Can not call createAnswer after close"))}if(!("have-remote-offer"===r.signalingState||"have-local-pranswer"===r.signalingState)){return Promise.reject(d("InvalidStateError","Can not call createAnswer in signalingState "+r.signalingState))}var n=c.writeSessionBoilerplate(r._sdpSessionId,r._sdpSessionVersion++);if(r.usingBundle){n+="a=group:BUNDLE "+r.transceivers.map(function(e){return e.mid}).join(" ")+"\r\n"}n+="a=ice-options:trickle\r\n";var o=c.getMediaSections(r._remoteDescription.sdp).length;r.transceivers.forEach(function(e,s){if(s+1>o){return}if(e.rejected){if("application"===e.kind){if("DTLS/SCTP"===e.protocol){n+="m=application 0 DTLS/SCTP 5000\r\n"}else{n+="m=application 0 "+e.protocol+" webrtc-datachannel\r\n"}}else if("audio"===e.kind){n+="m=audio 0 UDP/TLS/RTP/SAVPF 0\r\na=rtpmap:0 PCMU/8000\r\n"}else if("video"===e.kind){n+="m=video 0 UDP/TLS/RTP/SAVPF 120\r\na=rtpmap:120 VP8/90000\r\n"}n+="c=IN IP4 0.0.0.0\r\na=inactive\r\na=mid:"+e.mid+"\r\n";return}if(e.stream){var d;if("audio"===e.kind){d=e.stream.getAudioTracks()[0]}else if("video"===e.kind){d=e.stream.getVideoTracks()[0]}if(d){if(15019<=t&&"video"===e.kind&&!e.sendEncodingParameters[0].rtx){e.sendEncodingParameters[0].rtx={ssrc:e.sendEncodingParameters[0].ssrc+1}}}}var c=i(e.localCapabilities,e.remoteCapabilities),p=c.codecs.filter(function(e){return"rtx"===e.name.toLowerCase()}).length;if(!p&&e.sendEncodingParameters[0].rtx){delete e.sendEncodingParameters[0].rtx}n+=a(e,c,"answer",e.stream,r._dtlsRole);if(e.rtcpParameters&&e.rtcpParameters.reducedSize){n+="a=rtcp-rsize\r\n"}});var s=new e.RTCSessionDescription({type:"answer",sdp:n});return Promise.resolve(s)};f.prototype.addIceCandidate=function(e){var t=this,r;if(e&&!(e.sdpMLineIndex!==void 0||e.sdpMid)){return Promise.reject(new TypeError("sdpMLineIndex or sdpMid required"))}return new Promise(function(a,n){if(!t._remoteDescription){return n(d("InvalidStateError","Can not add ICE candidate without a remote description"))}else if(!e||""===e.candidate){for(var o=0;o<t.transceivers.length;o++){if(t.transceivers[o].rejected){continue}t.transceivers[o].iceTransport.addRemoteCandidate({});r=c.getMediaSections(t._remoteDescription.sdp);r[o]+="a=end-of-candidates\r\n";t._remoteDescription.sdp=c.getDescription(t._remoteDescription.sdp)+r.join("");if(t.usingBundle){break}}}else{var p=e.sdpMLineIndex;if(e.sdpMid){for(var l=0;l<t.transceivers.length;l++){if(t.transceivers[l].mid===e.sdpMid){p=l;break}}}var m=t.transceivers[p];if(m){if(m.rejected){return a()}var f=0<Object.keys(e.candidate).length?c.parseCandidate(e.candidate):{};if("tcp"===f.protocol&&(0===f.port||9===f.port)){return a()}if(f.component&&1!==f.component){return a()}if(0===p||0<p&&m.iceTransport!==t.transceivers[0].iceTransport){if(!s(m.iceTransport,f)){return n(d("OperationError","Can not add ICE candidate"))}}var h=e.candidate.trim();if(0===h.indexOf("a=")){h=h.substr(2)}r=c.getMediaSections(t._remoteDescription.sdp);r[p]+="a="+(f.type?h:"end-of-candidates")+"\r\n";t._remoteDescription.sdp=c.getDescription(t._remoteDescription.sdp)+r.join("")}else{return n(d("OperationError","Can not add ICE candidate"))}}a()})};f.prototype.getStats=function(t){if(t&&t instanceof e.MediaStreamTrack){var r=null;this.transceivers.forEach(function(e){if(e.rtpSender&&e.rtpSender.track===t){r=e.rtpSender}else if(e.rtpReceiver&&e.rtpReceiver.track===t){r=e.rtpReceiver}});if(!r){throw d("InvalidAccessError","Invalid selector.")}return r.getStats()}var a=[];this.transceivers.forEach(function(e){["rtpSender","rtpReceiver","iceGatherer","iceTransport","dtlsTransport"].forEach(function(t){if(e[t]){a.push(e[t].getStats())}})});return Promise.all(a).then(function(e){var t=new Map;e.forEach(function(e){e.forEach(function(e){t.set(e.id,e)})});return t})};["RTCRtpSender","RTCRtpReceiver","RTCIceGatherer","RTCIceTransport","RTCDtlsTransport"].forEach(function(t){var a=e[t];if(a&&a.prototype&&a.prototype.getStats){var n=a.prototype.getStats;a.prototype.getStats=function(){return n.apply(this).then(function(e){var t=new Map;Object.keys(e).forEach(function(a){e[a].type=r(e[a]);t.set(a,e[a])});return t})}}});var h=["createOffer","createAnswer"];h.forEach(function(e){var t=f.prototype[e];f.prototype[e]=function(){var e=arguments;if("function"==typeof e[0]||"function"==typeof e[1]){return t.apply(this,[arguments[2]]).then(function(t){if("function"==typeof e[0]){e[0].apply(null,[t])}},function(t){if("function"==typeof e[1]){e[1].apply(null,[t])}})}return t.apply(this,arguments)}});h=["setLocalDescription","setRemoteDescription","addIceCandidate"];h.forEach(function(e){var t=f.prototype[e];f.prototype[e]=function(){var e=arguments;if("function"==typeof e[1]||"function"==typeof e[2]){return t.apply(this,arguments).then(function(){if("function"==typeof e[1]){e[1].apply(null)}},function(t){if("function"==typeof e[2]){e[2].apply(null,[t])}})}return t.apply(this,arguments)}});["getStats"].forEach(function(e){var t=f.prototype[e];f.prototype[e]=function(){var e=arguments;if("function"==typeof e[1]){return t.apply(this,arguments).then(function(){if("function"==typeof e[1]){e[1].apply(null)}})}return t.apply(this,arguments)}});return f}},{sdp:17}],17:[function(e,t){'use strict';var r={generateIdentifier:function(){return Math.random().toString(36).substr(2,10)}};r.localCName=r.generateIdentifier();r.splitLines=function(e){return e.trim().split("\n").map(function(e){return e.trim()})};r.splitSections=function(e){var t=e.split("\nm=");return t.map(function(e,t){return(0<t?"m="+e:e).trim()+"\r\n"})};r.getDescription=function(e){var t=r.splitSections(e);return t&&t[0]};r.getMediaSections=function(e){var t=r.splitSections(e);t.shift();return t};r.matchPrefix=function(e,t){return r.splitLines(e).filter(function(e){return 0===e.indexOf(t)})};r.parseCandidate=function(e){var t;if(0===e.indexOf("a=candidate:")){t=e.substring(12).split(" ")}else{t=e.substring(10).split(" ")}for(var r={foundation:t[0],component:parseInt(t[1],10),protocol:t[2].toLowerCase(),priority:parseInt(t[3],10),ip:t[4],address:t[4],port:parseInt(t[5],10),type:t[7]},a=8;a<t.length;a+=2){switch(t[a]){case"raddr":r.relatedAddress=t[a+1];break;case"rport":r.relatedPort=parseInt(t[a+1],10);break;case"tcptype":r.tcpType=t[a+1];break;case"ufrag":r.ufrag=t[a+1];r.usernameFragment=t[a+1];break;default:r[t[a]]=t[a+1];break;}}return r};r.writeCandidate=function(e){var t=[e.foundation,e.component,e.protocol.toUpperCase(),e.priority,e.address||e.ip,e.port],r=e.type;t.push("typ");t.push(r);if("host"!==r&&e.relatedAddress&&e.relatedPort){t.push("raddr");t.push(e.relatedAddress);t.push("rport");t.push(e.relatedPort)}if(e.tcpType&&"tcp"===e.protocol.toLowerCase()){t.push("tcptype");t.push(e.tcpType)}if(e.usernameFragment||e.ufrag){t.push("ufrag");t.push(e.usernameFragment||e.ufrag)}return"candidate:"+t.join(" ")};r.parseIceOptions=function(e){return e.substr(14).split(" ")};r.parseRtpMap=function(e){var t=e.substr(9).split(" "),r={payloadType:parseInt(t.shift(),10)};t=t[0].split("/");r.name=t[0];r.clockRate=parseInt(t[1],10);r.channels=3===t.length?parseInt(t[2],10):1;r.numChannels=r.channels;return r};r.writeRtpMap=function(e){var t=e.payloadType;if(e.preferredPayloadType!==void 0){t=e.preferredPayloadType}var r=e.channels||e.numChannels||1;return"a=rtpmap:"+t+" "+e.name+"/"+e.clockRate+(1!==r?"/"+r:"")+"\r\n"};r.parseExtmap=function(e){var t=e.substr(9).split(" ");return{id:parseInt(t[0],10),direction:0<t[0].indexOf("/")?t[0].split("/")[1]:"sendrecv",uri:t[1]}};r.writeExtmap=function(e){return"a=extmap:"+(e.id||e.preferredId)+(e.direction&&"sendrecv"!==e.direction?"/"+e.direction:"")+" "+e.uri+"\r\n"};r.parseFmtp=function(e){for(var t={},r,a=e.substr(e.indexOf(" ")+1).split(";"),n=0;n<a.length;n++){r=a[n].trim().split("=");t[r[0].trim()]=r[1]}return t};r.writeFmtp=function(e){var t="",r=e.payloadType;if(e.preferredPayloadType!==void 0){r=e.preferredPayloadType}if(e.parameters&&Object.keys(e.parameters).length){var a=[];Object.keys(e.parameters).forEach(function(t){if(e.parameters[t]){a.push(t+"="+e.parameters[t])}else{a.push(t)}});t+="a=fmtp:"+r+" "+a.join(";")+"\r\n"}return t};r.parseRtcpFb=function(e){var t=e.substr(e.indexOf(" ")+1).split(" ");return{type:t.shift(),parameter:t.join(" ")}};r.writeRtcpFb=function(e){var t="",r=e.payloadType;if(e.preferredPayloadType!==void 0){r=e.preferredPayloadType}if(e.rtcpFeedback&&e.rtcpFeedback.length){e.rtcpFeedback.forEach(function(e){t+="a=rtcp-fb:"+r+" "+e.type+(e.parameter&&e.parameter.length?" "+e.parameter:"")+"\r\n"})}return t};r.parseSsrcMedia=function(e){var t=e.indexOf(" "),r={ssrc:parseInt(e.substr(7,t-7),10)},a=e.indexOf(":",t);if(-1<a){r.attribute=e.substr(t+1,a-t-1);r.value=e.substr(a+1)}else{r.attribute=e.substr(t+1)}return r};r.parseSsrcGroup=function(e){var t=e.substr(13).split(" ");return{semantics:t.shift(),ssrcs:t.map(function(e){return parseInt(e,10)})}};r.getMid=function(e){var t=r.matchPrefix(e,"a=mid:")[0];if(t){return t.substr(6)}};r.parseFingerprint=function(e){var t=e.substr(14).split(" ");return{algorithm:t[0].toLowerCase(),value:t[1]}};r.getDtlsParameters=function(e,t){var a=r.matchPrefix(e+t,"a=fingerprint:");return{role:"auto",fingerprints:a.map(r.parseFingerprint)}};r.writeDtlsParameters=function(e,t){var r="a=setup:"+t+"\r\n";e.fingerprints.forEach(function(e){r+="a=fingerprint:"+e.algorithm+" "+e.value+"\r\n"});return r};r.getIceParameters=function(e,t){var a=r.splitLines(e);a=a.concat(r.splitLines(t));var n={usernameFragment:a.filter(function(e){return 0===e.indexOf("a=ice-ufrag:")})[0].substr(12),password:a.filter(function(e){return 0===e.indexOf("a=ice-pwd:")})[0].substr(10)};return n};r.writeIceParameters=function(e){return"a=ice-ufrag:"+e.usernameFragment+"\r\na=ice-pwd:"+e.password+"\r\n"};r.parseRtpParameters=function(e){for(var t={codecs:[],headerExtensions:[],fecMechanisms:[],rtcp:[]},a=r.splitLines(e),n=a[0].split(" "),o=3;o<n.length;o++){var s=n[o],d=r.matchPrefix(e,"a=rtpmap:"+s+" ")[0];if(d){var c=r.parseRtpMap(d),p=r.matchPrefix(e,"a=fmtp:"+s+" ");c.parameters=p.length?r.parseFmtp(p[0]):{};c.rtcpFeedback=r.matchPrefix(e,"a=rtcp-fb:"+s+" ").map(r.parseRtcpFb);t.codecs.push(c);switch(c.name.toUpperCase()){case"RED":case"ULPFEC":t.fecMechanisms.push(c.name.toUpperCase());break;default:break;}}}r.matchPrefix(e,"a=extmap:").forEach(function(e){t.headerExtensions.push(r.parseExtmap(e))});return t};r.writeRtpDescription=function(e,t){var a="";a+="m="+e+" ";a+=0<t.codecs.length?"9":"0";a+=" UDP/TLS/RTP/SAVPF ";a+=t.codecs.map(function(e){if(e.preferredPayloadType!==void 0){return e.preferredPayloadType}return e.payloadType}).join(" ")+"\r\n";a+="c=IN IP4 0.0.0.0\r\n";a+="a=rtcp:9 IN IP4 0.0.0.0\r\n";t.codecs.forEach(function(e){a+=r.writeRtpMap(e);a+=r.writeFmtp(e);a+=r.writeRtcpFb(e)});var n=0;t.codecs.forEach(function(e){if(e.maxptime>n){n=e.maxptime}});if(0<n){a+="a=maxptime:"+n+"\r\n"}a+="a=rtcp-mux\r\n";if(t.headerExtensions){t.headerExtensions.forEach(function(e){a+=r.writeExtmap(e)})}return a};r.parseRtpEncodingParameters=function(e){var t=[],a=r.parseRtpParameters(e),n=-1!==a.fecMechanisms.indexOf("RED"),i=-1!==a.fecMechanisms.indexOf("ULPFEC"),o=r.matchPrefix(e,"a=ssrc:").map(function(e){return r.parseSsrcMedia(e)}).filter(function(e){return"cname"===e.attribute}),s=0<o.length&&o[0].ssrc,d,c=r.matchPrefix(e,"a=ssrc-group:FID").map(function(e){var t=e.substr(17).split(" ");return t.map(function(e){return parseInt(e,10)})});if(0<c.length&&1<c[0].length&&c[0][0]===s){d=c[0][1]}a.codecs.forEach(function(e){if("RTX"===e.name.toUpperCase()&&e.parameters.apt){var r={ssrc:s,codecPayloadType:parseInt(e.parameters.apt,10)};if(s&&d){r.rtx={ssrc:d}}t.push(r);if(n){r=JSON.parse(JSON.stringify(r));r.fec={ssrc:s,mechanism:i?"red+ulpfec":"red"};t.push(r)}}});if(0===t.length&&s){t.push({ssrc:s})}var p=r.matchPrefix(e,"b=");if(p.length){if(0===p[0].indexOf("b=TIAS:")){p=parseInt(p[0].substr(7),10)}else if(0===p[0].indexOf("b=AS:")){p=.95*(1e3*parseInt(p[0].substr(5),10))-16000}else{p=void 0}t.forEach(function(e){e.maxBitrate=p})}return t};r.parseRtcpParameters=function(e){var t={},a=r.matchPrefix(e,"a=ssrc:").map(function(e){return r.parseSsrcMedia(e)}).filter(function(e){return"cname"===e.attribute})[0];if(a){t.cname=a.value;t.ssrc=a.ssrc}var n=r.matchPrefix(e,"a=rtcp-rsize");t.reducedSize=0<n.length;t.compound=0===n.length;var i=r.matchPrefix(e,"a=rtcp-mux");t.mux=0<i.length;return t};r.parseMsid=function(e){var t,a=r.matchPrefix(e,"a=msid:");if(1===a.length){t=a[0].substr(7).split(" ");return{stream:t[0],track:t[1]}}var n=r.matchPrefix(e,"a=ssrc:").map(function(e){return r.parseSsrcMedia(e)}).filter(function(e){return"msid"===e.attribute});if(0<n.length){t=n[0].value.split(" ");return{stream:t[0],track:t[1]}}};r.parseSctpDescription=function(e){var t=r.parseMLine(e),a=r.matchPrefix(e,"a=max-message-size:"),n;if(0<a.length){n=parseInt(a[0].substr(19),10)}if(isNaN(n)){n=65536}var i=r.matchPrefix(e,"a=sctp-port:");if(0<i.length){return{port:parseInt(i[0].substr(12),10),protocol:t.fmt,maxMessageSize:n}}var o=r.matchPrefix(e,"a=sctpmap:");if(0<o.length){var s=r.matchPrefix(e,"a=sctpmap:")[0].substr(10).split(" ");return{port:parseInt(s[0],10),protocol:s[1],maxMessageSize:n}}};r.writeSctpDescription=function(e,t){var r=[];if("DTLS/SCTP"!==e.protocol){r=["m="+e.kind+" 9 "+e.protocol+" "+t.protocol+"\r\n","c=IN IP4 0.0.0.0\r\n","a=sctp-port:"+t.port+"\r\n"]}else{r=["m="+e.kind+" 9 "+e.protocol+" "+t.port+"\r\n","c=IN IP4 0.0.0.0\r\n","a=sctpmap:"+t.port+" "+t.protocol+" 65535\r\n"]}if(t.maxMessageSize!==void 0){r.push("a=max-message-size:"+t.maxMessageSize+"\r\n")}return r.join("")};r.generateSessionId=function(){return Math.random().toString().substr(2,21)};r.writeSessionBoilerplate=function(e,t,a){var n,i=t!==void 0?t:2;if(e){n=e}else{n=r.generateSessionId()}return"v=0\r\no="+(a||"thisisadapterortc")+" "+n+" "+i+" IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\n"};r.writeMediaSection=function(e,t,a,n){var i=r.writeRtpDescription(e.kind,t);i+=r.writeIceParameters(e.iceGatherer.getLocalParameters());i+=r.writeDtlsParameters(e.dtlsTransport.getLocalParameters(),"offer"===a?"actpass":"active");i+="a=mid:"+e.mid+"\r\n";if(e.direction){i+="a="+e.direction+"\r\n"}else if(e.rtpSender&&e.rtpReceiver){i+="a=sendrecv\r\n"}else if(e.rtpSender){i+="a=sendonly\r\n"}else if(e.rtpReceiver){i+="a=recvonly\r\n"}else{i+="a=inactive\r\n"}if(e.rtpSender){var o="msid:"+n.id+" "+e.rtpSender.track.id+"\r\n";i+="a="+o;i+="a=ssrc:"+e.sendEncodingParameters[0].ssrc+" "+o;if(e.sendEncodingParameters[0].rtx){i+="a=ssrc:"+e.sendEncodingParameters[0].rtx.ssrc+" "+o;i+="a=ssrc-group:FID "+e.sendEncodingParameters[0].ssrc+" "+e.sendEncodingParameters[0].rtx.ssrc+"\r\n"}}i+="a=ssrc:"+e.sendEncodingParameters[0].ssrc+" cname:"+r.localCName+"\r\n";if(e.rtpSender&&e.sendEncodingParameters[0].rtx){i+="a=ssrc:"+e.sendEncodingParameters[0].rtx.ssrc+" cname:"+r.localCName+"\r\n"}return i};r.getDirection=function(e,t){for(var a=r.splitLines(e),n=0;n<a.length;n++){switch(a[n]){case"a=sendrecv":case"a=sendonly":case"a=recvonly":case"a=inactive":return a[n].substr(2);default:}}if(t){return r.getDirection(t)}return"sendrecv"};r.getKind=function(e){var t=r.splitLines(e),a=t[0].split(" ");return a[0].substr(2)};r.isRejected=function(e){return"0"===e.split(" ",2)[1]};r.parseMLine=function(e){var t=r.splitLines(e),a=t[0].substr(2).split(" ");return{kind:a[0],port:parseInt(a[1],10),protocol:a[2],fmt:a.slice(3).join(" ")}};r.parseOLine=function(e){var t=r.matchPrefix(e,"o=")[0],a=t.substr(2).split(" ");return{username:a[0],sessionId:a[1],sessionVersion:parseInt(a[2],10),netType:a[3],addressType:a[4],address:a[5]}};r.isValidSDP=function(e){if("string"!=typeof e||0===e.length){return!1}for(var t=r.splitLines(e),a=0;a<t.length;a++){if(2>t[a].length||"="!==t[a].charAt(1)){return!1}}return!0};if("object"===_typeof2(t)){t.exports=r}},{}]},{},[1])(1)});
 //# sourceMappingURL=adapter.min.js.map
diff --git a/lib/amd/build/adapter.min.js.map b/lib/amd/build/adapter.min.js.map
index 7ae1a5bb041..306847b96d1 100644
--- a/lib/amd/build/adapter.min.js.map
+++ b/lib/amd/build/adapter.min.js.map
@@ -1 +1 @@
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* Description of import/upgrade into Moodle:\n *\n * 1. Visit https://github.com/webrtc/adapter/releases.\n * 2. Check if the version has been updated from what is listed in lib/thirdpartylibs.xml in the Moodle wwwroot.\n * 3. If it has -\n *    1. Download the source code.\n *    2. Copy the content of the file release/adapter.js from the archive (ignore the first line).\n *    3. Replace the content below \"return (function e(t,n,r) ..\" in this file with the content you copied.\n *    4. Ensure to update lib/thirdpartylibs.xml with any changes.\n */\n\n// ESLint directives.\n/* eslint-disable */\n\n// JSHint directives.\n/* jshint ignore:start */\n\ndefine([], function() {\nreturn (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n        'use strict';\n\n        var SDPUtils = require('sdp');\n\n        function fixStatsType(stat) {\n            return {\n                inboundrtp: 'inbound-rtp',\n                outboundrtp: 'outbound-rtp',\n                candidatepair: 'candidate-pair',\n                localcandidate: 'local-candidate',\n                remotecandidate: 'remote-candidate'\n            }[stat.type] || stat.type;\n        }\n\n        function writeMediaSection(transceiver, caps, type, stream, dtlsRole) {\n            var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n            // Map ICE parameters (ufrag, pwd) to SDP.\n            sdp += SDPUtils.writeIceParameters(\n                transceiver.iceGatherer.getLocalParameters());\n\n            // Map DTLS parameters to SDP.\n            sdp += SDPUtils.writeDtlsParameters(\n                transceiver.dtlsTransport.getLocalParameters(),\n                type === 'offer' ? 'actpass' : dtlsRole || 'active');\n\n            sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n            if (transceiver.rtpSender && transceiver.rtpReceiver) {\n                sdp += 'a=sendrecv\\r\\n';\n            } else if (transceiver.rtpSender) {\n                sdp += 'a=sendonly\\r\\n';\n            } else if (transceiver.rtpReceiver) {\n                sdp += 'a=recvonly\\r\\n';\n            } else {\n                sdp += 'a=inactive\\r\\n';\n            }\n\n            if (transceiver.rtpSender) {\n                var trackId = transceiver.rtpSender._initialTrackId ||\n                    transceiver.rtpSender.track.id;\n                transceiver.rtpSender._initialTrackId = trackId;\n                // spec.\n                var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +\n                    trackId + '\\r\\n';\n                sdp += 'a=' + msid;\n                // for Chrome. Legacy should no longer be required.\n                sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n                    ' ' + msid;\n\n                // RTX\n                if (transceiver.sendEncodingParameters[0].rtx) {\n                    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n                        ' ' + msid;\n                    sdp += 'a=ssrc-group:FID ' +\n                        transceiver.sendEncodingParameters[0].ssrc + ' ' +\n                        transceiver.sendEncodingParameters[0].rtx.ssrc +\n                        '\\r\\n';\n                }\n            }\n            // FIXME: this should be written by writeRtpDescription.\n            sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n                ' cname:' + SDPUtils.localCName + '\\r\\n';\n            if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n                sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n                    ' cname:' + SDPUtils.localCName + '\\r\\n';\n            }\n            return sdp;\n        }\n\n        // Edge does not like\n        // 1) stun: filtered after 14393 unless ?transport=udp is present\n        // 2) turn: that does not have all of turn:host:port?transport=udp\n        // 3) turn: with ipv6 addresses\n        // 4) turn: occurring muliple times\n        function filterIceServers(iceServers, edgeVersion) {\n            var hasTurn = false;\n            iceServers = JSON.parse(JSON.stringify(iceServers));\n            return iceServers.filter(function(server) {\n                if (server && (server.urls || server.url)) {\n                    var urls = server.urls || server.url;\n                    if (server.url && !server.urls) {\n                        console.warn('RTCIceServer.url is deprecated! Use urls instead.');\n                    }\n                    var isString = typeof urls === 'string';\n                    if (isString) {\n                        urls = [urls];\n                    }\n                    urls = urls.filter(function(url) {\n                        var validTurn = url.indexOf('turn:') === 0 &&\n                            url.indexOf('transport=udp') !== -1 &&\n                            url.indexOf('turn:[') === -1 &&\n                            !hasTurn;\n\n                        if (validTurn) {\n                            hasTurn = true;\n                            return true;\n                        }\n                        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&\n                            url.indexOf('?transport=udp') === -1;\n                    });\n\n                    delete server.url;\n                    server.urls = isString ? urls[0] : urls;\n                    return !!urls.length;\n                }\n            });\n        }\n\n        // Determines the intersection of local and remote capabilities.\n        function getCommonCapabilities(localCapabilities, remoteCapabilities) {\n            var commonCapabilities = {\n                codecs: [],\n                headerExtensions: [],\n                fecMechanisms: []\n            };\n\n            var findCodecByPayloadType = function(pt, codecs) {\n                pt = parseInt(pt, 10);\n                for (var i = 0; i < codecs.length; i++) {\n                    if (codecs[i].payloadType === pt ||\n                        codecs[i].preferredPayloadType === pt) {\n                        return codecs[i];\n                    }\n                }\n            };\n\n            var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {\n                var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);\n                var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);\n                return lCodec && rCodec &&\n                    lCodec.name.toLowerCase() === rCodec.name.toLowerCase();\n            };\n\n            localCapabilities.codecs.forEach(function(lCodec) {\n                for (var i = 0; i < remoteCapabilities.codecs.length; i++) {\n                    var rCodec = remoteCapabilities.codecs[i];\n                    if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&\n                        lCodec.clockRate === rCodec.clockRate) {\n                        if (lCodec.name.toLowerCase() === 'rtx' &&\n                            lCodec.parameters && rCodec.parameters.apt) {\n                            // for RTX we need to find the local rtx that has a apt\n                            // which points to the same local codec as the remote one.\n                            if (!rtxCapabilityMatches(lCodec, rCodec,\n                                    localCapabilities.codecs, remoteCapabilities.codecs)) {\n                                continue;\n                            }\n                        }\n                        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy\n                        // number of channels is the highest common number of channels\n                        rCodec.numChannels = Math.min(lCodec.numChannels,\n                            rCodec.numChannels);\n                        // push rCodec so we reply with offerer payload type\n                        commonCapabilities.codecs.push(rCodec);\n\n                        // determine common feedback mechanisms\n                        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {\n                            for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {\n                                if (lCodec.rtcpFeedback[j].type === fb.type &&\n                                    lCodec.rtcpFeedback[j].parameter === fb.parameter) {\n                                    return true;\n                                }\n                            }\n                            return false;\n                        });\n                        // FIXME: also need to determine .parameters\n                        //  see https://github.com/openpeer/ortc/issues/569\n                        break;\n                    }\n                }\n            });\n\n            localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {\n                for (var i = 0; i < remoteCapabilities.headerExtensions.length;\n                     i++) {\n                    var rHeaderExtension = remoteCapabilities.headerExtensions[i];\n                    if (lHeaderExtension.uri === rHeaderExtension.uri) {\n                        commonCapabilities.headerExtensions.push(rHeaderExtension);\n                        break;\n                    }\n                }\n            });\n\n            // FIXME: fecMechanisms\n            return commonCapabilities;\n        }\n\n        // is action=setLocalDescription with type allowed in signalingState\n        function isActionAllowedInSignalingState(action, type, signalingState) {\n            return {\n                offer: {\n                    setLocalDescription: ['stable', 'have-local-offer'],\n                    setRemoteDescription: ['stable', 'have-remote-offer']\n                },\n                answer: {\n                    setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],\n                    setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']\n                }\n            }[type][action].indexOf(signalingState) !== -1;\n        }\n\n        function maybeAddCandidate(iceTransport, candidate) {\n            // Edge's internal representation adds some fields therefore\n            // not all fieldѕ are taken into account.\n            var alreadyAdded = iceTransport.getRemoteCandidates()\n                .find(function(remoteCandidate) {\n                    return candidate.foundation === remoteCandidate.foundation &&\n                        candidate.ip === remoteCandidate.ip &&\n                        candidate.port === remoteCandidate.port &&\n                        candidate.priority === remoteCandidate.priority &&\n                        candidate.protocol === remoteCandidate.protocol &&\n                        candidate.type === remoteCandidate.type;\n                });\n            if (!alreadyAdded) {\n                iceTransport.addRemoteCandidate(candidate);\n            }\n            return !alreadyAdded;\n        }\n\n\n        function makeError(name, description) {\n            var e = new Error(description);\n            e.name = name;\n            // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names\n            e.code = {\n                NotSupportedError: 9,\n                InvalidStateError: 11,\n                InvalidAccessError: 15,\n                TypeError: undefined,\n                OperationError: undefined\n            }[name];\n            return e;\n        }\n\n        module.exports = function(window, edgeVersion) {\n            // https://w3c.github.io/mediacapture-main/#mediastream\n            // Helper function to add the track to the stream and\n            // dispatch the event ourselves.\n            function addTrackToStreamAndFireEvent(track, stream) {\n                stream.addTrack(track);\n                stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack',\n                    {track: track}));\n            }\n\n            function removeTrackFromStreamAndFireEvent(track, stream) {\n                stream.removeTrack(track);\n                stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack',\n                    {track: track}));\n            }\n\n            function fireAddTrack(pc, track, receiver, streams) {\n                var trackEvent = new Event('track');\n                trackEvent.track = track;\n                trackEvent.receiver = receiver;\n                trackEvent.transceiver = {receiver: receiver};\n                trackEvent.streams = streams;\n                window.setTimeout(function() {\n                    pc._dispatchEvent('track', trackEvent);\n                });\n            }\n\n            var RTCPeerConnection = function(config) {\n                var pc = this;\n\n                var _eventTarget = document.createDocumentFragment();\n                ['addEventListener', 'removeEventListener', 'dispatchEvent']\n                    .forEach(function(method) {\n                        pc[method] = _eventTarget[method].bind(_eventTarget);\n                    });\n\n                this.canTrickleIceCandidates = null;\n\n                this.needNegotiation = false;\n\n                this.localStreams = [];\n                this.remoteStreams = [];\n\n                this._localDescription = null;\n                this._remoteDescription = null;\n\n                this.signalingState = 'stable';\n                this.iceConnectionState = 'new';\n                this.connectionState = 'new';\n                this.iceGatheringState = 'new';\n\n                config = JSON.parse(JSON.stringify(config || {}));\n\n                this.usingBundle = config.bundlePolicy === 'max-bundle';\n                if (config.rtcpMuxPolicy === 'negotiate') {\n                    throw(makeError('NotSupportedError',\n                        'rtcpMuxPolicy \\'negotiate\\' is not supported'));\n                } else if (!config.rtcpMuxPolicy) {\n                    config.rtcpMuxPolicy = 'require';\n                }\n\n                switch (config.iceTransportPolicy) {\n                    case 'all':\n                    case 'relay':\n                        break;\n                    default:\n                        config.iceTransportPolicy = 'all';\n                        break;\n                }\n\n                switch (config.bundlePolicy) {\n                    case 'balanced':\n                    case 'max-compat':\n                    case 'max-bundle':\n                        break;\n                    default:\n                        config.bundlePolicy = 'balanced';\n                        break;\n                }\n\n                config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);\n\n                this._iceGatherers = [];\n                if (config.iceCandidatePoolSize) {\n                    for (var i = config.iceCandidatePoolSize; i > 0; i--) {\n                        this._iceGatherers.push(new window.RTCIceGatherer({\n                            iceServers: config.iceServers,\n                            gatherPolicy: config.iceTransportPolicy\n                        }));\n                    }\n                } else {\n                    config.iceCandidatePoolSize = 0;\n                }\n\n                this._config = config;\n\n                // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...\n                // everything that is needed to describe a SDP m-line.\n                this.transceivers = [];\n\n                this._sdpSessionId = SDPUtils.generateSessionId();\n                this._sdpSessionVersion = 0;\n\n                this._dtlsRole = undefined; // role for a=setup to use in answers.\n\n                this._isClosed = false;\n            };\n\n            Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {\n                configurable: true,\n                get: function() {\n                    return this._localDescription;\n                }\n            });\n            Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {\n                configurable: true,\n                get: function() {\n                    return this._remoteDescription;\n                }\n            });\n\n            // set up event handlers on prototype\n            RTCPeerConnection.prototype.onicecandidate = null;\n            RTCPeerConnection.prototype.onaddstream = null;\n            RTCPeerConnection.prototype.ontrack = null;\n            RTCPeerConnection.prototype.onremovestream = null;\n            RTCPeerConnection.prototype.onsignalingstatechange = null;\n            RTCPeerConnection.prototype.oniceconnectionstatechange = null;\n            RTCPeerConnection.prototype.onconnectionstatechange = null;\n            RTCPeerConnection.prototype.onicegatheringstatechange = null;\n            RTCPeerConnection.prototype.onnegotiationneeded = null;\n            RTCPeerConnection.prototype.ondatachannel = null;\n\n            RTCPeerConnection.prototype._dispatchEvent = function(name, event) {\n                if (this._isClosed) {\n                    return;\n                }\n                this.dispatchEvent(event);\n                if (typeof this['on' + name] === 'function') {\n                    this['on' + name](event);\n                }\n            };\n\n            RTCPeerConnection.prototype._emitGatheringStateChange = function() {\n                var event = new Event('icegatheringstatechange');\n                this._dispatchEvent('icegatheringstatechange', event);\n            };\n\n            RTCPeerConnection.prototype.getConfiguration = function() {\n                return this._config;\n            };\n\n            RTCPeerConnection.prototype.getLocalStreams = function() {\n                return this.localStreams;\n            };\n\n            RTCPeerConnection.prototype.getRemoteStreams = function() {\n                return this.remoteStreams;\n            };\n\n            // internal helper to create a transceiver object.\n            // (which is not yet the same as the WebRTC 1.0 transceiver)\n            RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {\n                var hasBundleTransport = this.transceivers.length > 0;\n                var transceiver = {\n                    track: null,\n                    iceGatherer: null,\n                    iceTransport: null,\n                    dtlsTransport: null,\n                    localCapabilities: null,\n                    remoteCapabilities: null,\n                    rtpSender: null,\n                    rtpReceiver: null,\n                    kind: kind,\n                    mid: null,\n                    sendEncodingParameters: null,\n                    recvEncodingParameters: null,\n                    stream: null,\n                    associatedRemoteMediaStreams: [],\n                    wantReceive: true\n                };\n                if (this.usingBundle && hasBundleTransport) {\n                    transceiver.iceTransport = this.transceivers[0].iceTransport;\n                    transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;\n                } else {\n                    var transports = this._createIceAndDtlsTransports();\n                    transceiver.iceTransport = transports.iceTransport;\n                    transceiver.dtlsTransport = transports.dtlsTransport;\n                }\n                if (!doNotAdd) {\n                    this.transceivers.push(transceiver);\n                }\n                return transceiver;\n            };\n\n            RTCPeerConnection.prototype.addTrack = function(track, stream) {\n                if (this._isClosed) {\n                    throw makeError('InvalidStateError',\n                        'Attempted to call addTrack on a closed peerconnection.');\n                }\n\n                var alreadyExists = this.transceivers.find(function(s) {\n                    return s.track === track;\n                });\n\n                if (alreadyExists) {\n                    throw makeError('InvalidAccessError', 'Track already exists.');\n                }\n\n                var transceiver;\n                for (var i = 0; i < this.transceivers.length; i++) {\n                    if (!this.transceivers[i].track &&\n                        this.transceivers[i].kind === track.kind) {\n                        transceiver = this.transceivers[i];\n                    }\n                }\n                if (!transceiver) {\n                    transceiver = this._createTransceiver(track.kind);\n                }\n\n                this._maybeFireNegotiationNeeded();\n\n                if (this.localStreams.indexOf(stream) === -1) {\n                    this.localStreams.push(stream);\n                }\n\n                transceiver.track = track;\n                transceiver.stream = stream;\n                transceiver.rtpSender = new window.RTCRtpSender(track,\n                    transceiver.dtlsTransport);\n                return transceiver.rtpSender;\n            };\n\n            RTCPeerConnection.prototype.addStream = function(stream) {\n                var pc = this;\n                if (edgeVersion >= 15025) {\n                    stream.getTracks().forEach(function(track) {\n                        pc.addTrack(track, stream);\n                    });\n                } else {\n                    // Clone is necessary for local demos mostly, attaching directly\n                    // to two different senders does not work (build 10547).\n                    // Fixed in 15025 (or earlier)\n                    var clonedStream = stream.clone();\n                    stream.getTracks().forEach(function(track, idx) {\n                        var clonedTrack = clonedStream.getTracks()[idx];\n                        track.addEventListener('enabled', function(event) {\n                            clonedTrack.enabled = event.enabled;\n                        });\n                    });\n                    clonedStream.getTracks().forEach(function(track) {\n                        pc.addTrack(track, clonedStream);\n                    });\n                }\n            };\n\n            RTCPeerConnection.prototype.removeTrack = function(sender) {\n                if (this._isClosed) {\n                    throw makeError('InvalidStateError',\n                        'Attempted to call removeTrack on a closed peerconnection.');\n                }\n\n                if (!(sender instanceof window.RTCRtpSender)) {\n                    throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' +\n                        'does not implement interface RTCRtpSender.');\n                }\n\n                var transceiver = this.transceivers.find(function(t) {\n                    return t.rtpSender === sender;\n                });\n\n                if (!transceiver) {\n                    throw makeError('InvalidAccessError',\n                        'Sender was not created by this connection.');\n                }\n                var stream = transceiver.stream;\n\n                transceiver.rtpSender.stop();\n                transceiver.rtpSender = null;\n                transceiver.track = null;\n                transceiver.stream = null;\n\n                // remove the stream from the set of local streams\n                var localStreams = this.transceivers.map(function(t) {\n                    return t.stream;\n                });\n                if (localStreams.indexOf(stream) === -1 &&\n                    this.localStreams.indexOf(stream) > -1) {\n                    this.localStreams.splice(this.localStreams.indexOf(stream), 1);\n                }\n\n                this._maybeFireNegotiationNeeded();\n            };\n\n            RTCPeerConnection.prototype.removeStream = function(stream) {\n                var pc = this;\n                stream.getTracks().forEach(function(track) {\n                    var sender = pc.getSenders().find(function(s) {\n                        return s.track === track;\n                    });\n                    if (sender) {\n                        pc.removeTrack(sender);\n                    }\n                });\n            };\n\n            RTCPeerConnection.prototype.getSenders = function() {\n                return this.transceivers.filter(function(transceiver) {\n                    return !!transceiver.rtpSender;\n                })\n                    .map(function(transceiver) {\n                        return transceiver.rtpSender;\n                    });\n            };\n\n            RTCPeerConnection.prototype.getReceivers = function() {\n                return this.transceivers.filter(function(transceiver) {\n                    return !!transceiver.rtpReceiver;\n                })\n                    .map(function(transceiver) {\n                        return transceiver.rtpReceiver;\n                    });\n            };\n\n\n            RTCPeerConnection.prototype._createIceGatherer = function(sdpMLineIndex,\n                                                                      usingBundle) {\n                var pc = this;\n                if (usingBundle && sdpMLineIndex > 0) {\n                    return this.transceivers[0].iceGatherer;\n                } else if (this._iceGatherers.length) {\n                    return this._iceGatherers.shift();\n                }\n                var iceGatherer = new window.RTCIceGatherer({\n                    iceServers: this._config.iceServers,\n                    gatherPolicy: this._config.iceTransportPolicy\n                });\n                Object.defineProperty(iceGatherer, 'state',\n                    {value: 'new', writable: true}\n                );\n\n                this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];\n                this.transceivers[sdpMLineIndex].bufferCandidates = function(event) {\n                    var end = !event.candidate || Object.keys(event.candidate).length === 0;\n                    // polyfill since RTCIceGatherer.state is not implemented in\n                    // Edge 10547 yet.\n                    iceGatherer.state = end ? 'completed' : 'gathering';\n                    if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {\n                        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);\n                    }\n                };\n                iceGatherer.addEventListener('localcandidate',\n                    this.transceivers[sdpMLineIndex].bufferCandidates);\n                return iceGatherer;\n            };\n\n            // start gathering from an RTCIceGatherer.\n            RTCPeerConnection.prototype._gather = function(mid, sdpMLineIndex) {\n                var pc = this;\n                var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n                if (iceGatherer.onlocalcandidate) {\n                    return;\n                }\n                var bufferedCandidateEvents =\n                    this.transceivers[sdpMLineIndex].bufferedCandidateEvents;\n                this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;\n                iceGatherer.removeEventListener('localcandidate',\n                    this.transceivers[sdpMLineIndex].bufferCandidates);\n                iceGatherer.onlocalcandidate = function(evt) {\n                    if (pc.usingBundle && sdpMLineIndex > 0) {\n                        // if we know that we use bundle we can drop candidates with\n                        // ѕdpMLineIndex > 0. If we don't do this then our state gets\n                        // confused since we dispose the extra ice gatherer.\n                        return;\n                    }\n                    var event = new Event('icecandidate');\n                    event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};\n\n                    var cand = evt.candidate;\n                    // Edge emits an empty object for RTCIceCandidateComplete‥\n                    var end = !cand || Object.keys(cand).length === 0;\n                    if (end) {\n                        // polyfill since RTCIceGatherer.state is not implemented in\n                        // Edge 10547 yet.\n                        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {\n                            iceGatherer.state = 'completed';\n                        }\n                    } else {\n                        if (iceGatherer.state === 'new') {\n                            iceGatherer.state = 'gathering';\n                        }\n                        // RTCIceCandidate doesn't have a component, needs to be added\n                        cand.component = 1;\n                        // also the usernameFragment. TODO: update SDP to take both variants.\n                        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;\n\n                        var serializedCandidate = SDPUtils.writeCandidate(cand);\n                        event.candidate = Object.assign(event.candidate,\n                            SDPUtils.parseCandidate(serializedCandidate));\n\n                        event.candidate.candidate = serializedCandidate;\n                        event.candidate.toJSON = function() {\n                            return {\n                                candidate: event.candidate.candidate,\n                                sdpMid: event.candidate.sdpMid,\n                                sdpMLineIndex: event.candidate.sdpMLineIndex,\n                                usernameFragment: event.candidate.usernameFragment\n                            };\n                        };\n                    }\n\n                    // update local description.\n                    var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);\n                    if (!end) {\n                        sections[event.candidate.sdpMLineIndex] +=\n                            'a=' + event.candidate.candidate + '\\r\\n';\n                    } else {\n                        sections[event.candidate.sdpMLineIndex] +=\n                            'a=end-of-candidates\\r\\n';\n                    }\n                    pc._localDescription.sdp =\n                        SDPUtils.getDescription(pc._localDescription.sdp) +\n                        sections.join('');\n                    var complete = pc.transceivers.every(function(transceiver) {\n                        return transceiver.iceGatherer &&\n                            transceiver.iceGatherer.state === 'completed';\n                    });\n\n                    if (pc.iceGatheringState !== 'gathering') {\n                        pc.iceGatheringState = 'gathering';\n                        pc._emitGatheringStateChange();\n                    }\n\n                    // Emit candidate. Also emit null candidate when all gatherers are\n                    // complete.\n                    if (!end) {\n                        pc._dispatchEvent('icecandidate', event);\n                    }\n                    if (complete) {\n                        pc._dispatchEvent('icecandidate', new Event('icecandidate'));\n                        pc.iceGatheringState = 'complete';\n                        pc._emitGatheringStateChange();\n                    }\n                };\n\n                // emit already gathered candidates.\n                window.setTimeout(function() {\n                    bufferedCandidateEvents.forEach(function(e) {\n                        iceGatherer.onlocalcandidate(e);\n                    });\n                }, 0);\n            };\n\n            // Create ICE transport and DTLS transport.\n            RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {\n                var pc = this;\n                var iceTransport = new window.RTCIceTransport(null);\n                iceTransport.onicestatechange = function() {\n                    pc._updateIceConnectionState();\n                    pc._updateConnectionState();\n                };\n\n                var dtlsTransport = new window.RTCDtlsTransport(iceTransport);\n                dtlsTransport.ondtlsstatechange = function() {\n                    pc._updateConnectionState();\n                };\n                dtlsTransport.onerror = function() {\n                    // onerror does not set state to failed by itself.\n                    Object.defineProperty(dtlsTransport, 'state',\n                        {value: 'failed', writable: true});\n                    pc._updateConnectionState();\n                };\n\n                return {\n                    iceTransport: iceTransport,\n                    dtlsTransport: dtlsTransport\n                };\n            };\n\n            // Destroy ICE gatherer, ICE transport and DTLS transport.\n            // Without triggering the callbacks.\n            RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(\n                sdpMLineIndex) {\n                var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n                if (iceGatherer) {\n                    delete iceGatherer.onlocalcandidate;\n                    delete this.transceivers[sdpMLineIndex].iceGatherer;\n                }\n                var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;\n                if (iceTransport) {\n                    delete iceTransport.onicestatechange;\n                    delete this.transceivers[sdpMLineIndex].iceTransport;\n                }\n                var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;\n                if (dtlsTransport) {\n                    delete dtlsTransport.ondtlsstatechange;\n                    delete dtlsTransport.onerror;\n                    delete this.transceivers[sdpMLineIndex].dtlsTransport;\n                }\n            };\n\n            // Start the RTP Sender and Receiver for a transceiver.\n            RTCPeerConnection.prototype._transceive = function(transceiver,\n                                                               send, recv) {\n                var params = getCommonCapabilities(transceiver.localCapabilities,\n                    transceiver.remoteCapabilities);\n                if (send && transceiver.rtpSender) {\n                    params.encodings = transceiver.sendEncodingParameters;\n                    params.rtcp = {\n                        cname: SDPUtils.localCName,\n                        compound: transceiver.rtcpParameters.compound\n                    };\n                    if (transceiver.recvEncodingParameters.length) {\n                        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;\n                    }\n                    transceiver.rtpSender.send(params);\n                }\n                if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {\n                    // remove RTX field in Edge 14942\n                    if (transceiver.kind === 'video'\n                        && transceiver.recvEncodingParameters\n                        && edgeVersion < 15019) {\n                        transceiver.recvEncodingParameters.forEach(function(p) {\n                            delete p.rtx;\n                        });\n                    }\n                    if (transceiver.recvEncodingParameters.length) {\n                        params.encodings = transceiver.recvEncodingParameters;\n                    } else {\n                        params.encodings = [{}];\n                    }\n                    params.rtcp = {\n                        compound: transceiver.rtcpParameters.compound\n                    };\n                    if (transceiver.rtcpParameters.cname) {\n                        params.rtcp.cname = transceiver.rtcpParameters.cname;\n                    }\n                    if (transceiver.sendEncodingParameters.length) {\n                        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;\n                    }\n                    transceiver.rtpReceiver.receive(params);\n                }\n            };\n\n            RTCPeerConnection.prototype.setLocalDescription = function(description) {\n                var pc = this;\n\n                // Note: pranswer is not supported.\n                if (['offer', 'answer'].indexOf(description.type) === -1) {\n                    return Promise.reject(makeError('TypeError',\n                        'Unsupported type \"' + description.type + '\"'));\n                }\n\n                if (!isActionAllowedInSignalingState('setLocalDescription',\n                        description.type, pc.signalingState) || pc._isClosed) {\n                    return Promise.reject(makeError('InvalidStateError',\n                        'Can not set local ' + description.type +\n                        ' in state ' + pc.signalingState));\n                }\n\n                var sections;\n                var sessionpart;\n                if (description.type === 'offer') {\n                    // VERY limited support for SDP munging. Limited to:\n                    // * changing the order of codecs\n                    sections = SDPUtils.splitSections(description.sdp);\n                    sessionpart = sections.shift();\n                    sections.forEach(function(mediaSection, sdpMLineIndex) {\n                        var caps = SDPUtils.parseRtpParameters(mediaSection);\n                        pc.transceivers[sdpMLineIndex].localCapabilities = caps;\n                    });\n\n                    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n                        pc._gather(transceiver.mid, sdpMLineIndex);\n                    });\n                } else if (description.type === 'answer') {\n                    sections = SDPUtils.splitSections(pc._remoteDescription.sdp);\n                    sessionpart = sections.shift();\n                    var isIceLite = SDPUtils.matchPrefix(sessionpart,\n                        'a=ice-lite').length > 0;\n                    sections.forEach(function(mediaSection, sdpMLineIndex) {\n                        var transceiver = pc.transceivers[sdpMLineIndex];\n                        var iceGatherer = transceiver.iceGatherer;\n                        var iceTransport = transceiver.iceTransport;\n                        var dtlsTransport = transceiver.dtlsTransport;\n                        var localCapabilities = transceiver.localCapabilities;\n                        var remoteCapabilities = transceiver.remoteCapabilities;\n\n                        // treat bundle-only as not-rejected.\n                        var rejected = SDPUtils.isRejected(mediaSection) &&\n                            SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n\n                        if (!rejected && !transceiver.rejected) {\n                            var remoteIceParameters = SDPUtils.getIceParameters(\n                                mediaSection, sessionpart);\n                            var remoteDtlsParameters = SDPUtils.getDtlsParameters(\n                                mediaSection, sessionpart);\n                            if (isIceLite) {\n                                remoteDtlsParameters.role = 'server';\n                            }\n\n                            if (!pc.usingBundle || sdpMLineIndex === 0) {\n                                pc._gather(transceiver.mid, sdpMLineIndex);\n                                if (iceTransport.state === 'new') {\n                                    iceTransport.start(iceGatherer, remoteIceParameters,\n                                        isIceLite ? 'controlling' : 'controlled');\n                                }\n                                if (dtlsTransport.state === 'new') {\n                                    dtlsTransport.start(remoteDtlsParameters);\n                                }\n                            }\n\n                            // Calculate intersection of capabilities.\n                            var params = getCommonCapabilities(localCapabilities,\n                                remoteCapabilities);\n\n                            // Start the RTCRtpSender. The RTCRtpReceiver for this\n                            // transceiver has already been started in setRemoteDescription.\n                            pc._transceive(transceiver,\n                                params.codecs.length > 0,\n                                false);\n                        }\n                    });\n                }\n\n                pc._localDescription = {\n                    type: description.type,\n                    sdp: description.sdp\n                };\n                if (description.type === 'offer') {\n                    pc._updateSignalingState('have-local-offer');\n                } else {\n                    pc._updateSignalingState('stable');\n                }\n\n                return Promise.resolve();\n            };\n\n            RTCPeerConnection.prototype.setRemoteDescription = function(description) {\n                var pc = this;\n\n                // Note: pranswer is not supported.\n                if (['offer', 'answer'].indexOf(description.type) === -1) {\n                    return Promise.reject(makeError('TypeError',\n                        'Unsupported type \"' + description.type + '\"'));\n                }\n\n                if (!isActionAllowedInSignalingState('setRemoteDescription',\n                        description.type, pc.signalingState) || pc._isClosed) {\n                    return Promise.reject(makeError('InvalidStateError',\n                        'Can not set remote ' + description.type +\n                        ' in state ' + pc.signalingState));\n                }\n\n                var streams = {};\n                pc.remoteStreams.forEach(function(stream) {\n                    streams[stream.id] = stream;\n                });\n                var receiverList = [];\n                var sections = SDPUtils.splitSections(description.sdp);\n                var sessionpart = sections.shift();\n                var isIceLite = SDPUtils.matchPrefix(sessionpart,\n                    'a=ice-lite').length > 0;\n                var usingBundle = SDPUtils.matchPrefix(sessionpart,\n                    'a=group:BUNDLE ').length > 0;\n                pc.usingBundle = usingBundle;\n                var iceOptions = SDPUtils.matchPrefix(sessionpart,\n                    'a=ice-options:')[0];\n                if (iceOptions) {\n                    pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ')\n                        .indexOf('trickle') >= 0;\n                } else {\n                    pc.canTrickleIceCandidates = false;\n                }\n\n                sections.forEach(function(mediaSection, sdpMLineIndex) {\n                    var lines = SDPUtils.splitLines(mediaSection);\n                    var kind = SDPUtils.getKind(mediaSection);\n                    // treat bundle-only as not-rejected.\n                    var rejected = SDPUtils.isRejected(mediaSection) &&\n                        SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n                    var protocol = lines[0].substr(2).split(' ')[2];\n\n                    var direction = SDPUtils.getDirection(mediaSection, sessionpart);\n                    var remoteMsid = SDPUtils.parseMsid(mediaSection);\n\n                    var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();\n\n                    // Reject datachannels which are not implemented yet.\n                    if (rejected || (kind === 'application' && (protocol === 'DTLS/SCTP' ||\n                            protocol === 'UDP/DTLS/SCTP'))) {\n                        // TODO: this is dangerous in the case where a non-rejected m-line\n                        //     becomes rejected.\n                        pc.transceivers[sdpMLineIndex] = {\n                            mid: mid,\n                            kind: kind,\n                            protocol: protocol,\n                            rejected: true\n                        };\n                        return;\n                    }\n\n                    if (!rejected && pc.transceivers[sdpMLineIndex] &&\n                        pc.transceivers[sdpMLineIndex].rejected) {\n                        // recycle a rejected transceiver.\n                        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);\n                    }\n\n                    var transceiver;\n                    var iceGatherer;\n                    var iceTransport;\n                    var dtlsTransport;\n                    var rtpReceiver;\n                    var sendEncodingParameters;\n                    var recvEncodingParameters;\n                    var localCapabilities;\n\n                    var track;\n                    // FIXME: ensure the mediaSection has rtcp-mux set.\n                    var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);\n                    var remoteIceParameters;\n                    var remoteDtlsParameters;\n                    if (!rejected) {\n                        remoteIceParameters = SDPUtils.getIceParameters(mediaSection,\n                            sessionpart);\n                        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,\n                            sessionpart);\n                        remoteDtlsParameters.role = 'client';\n                    }\n                    recvEncodingParameters =\n                        SDPUtils.parseRtpEncodingParameters(mediaSection);\n\n                    var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);\n\n                    var isComplete = SDPUtils.matchPrefix(mediaSection,\n                        'a=end-of-candidates', sessionpart).length > 0;\n                    var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')\n                        .map(function(cand) {\n                            return SDPUtils.parseCandidate(cand);\n                        })\n                        .filter(function(cand) {\n                            return cand.component === 1;\n                        });\n\n                    // Check if we can use BUNDLE and dispose transports.\n                    if ((description.type === 'offer' || description.type === 'answer') &&\n                        !rejected && usingBundle && sdpMLineIndex > 0 &&\n                        pc.transceivers[sdpMLineIndex]) {\n                        pc._disposeIceAndDtlsTransports(sdpMLineIndex);\n                        pc.transceivers[sdpMLineIndex].iceGatherer =\n                            pc.transceivers[0].iceGatherer;\n                        pc.transceivers[sdpMLineIndex].iceTransport =\n                            pc.transceivers[0].iceTransport;\n                        pc.transceivers[sdpMLineIndex].dtlsTransport =\n                            pc.transceivers[0].dtlsTransport;\n                        if (pc.transceivers[sdpMLineIndex].rtpSender) {\n                            pc.transceivers[sdpMLineIndex].rtpSender.setTransport(\n                                pc.transceivers[0].dtlsTransport);\n                        }\n                        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {\n                            pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(\n                                pc.transceivers[0].dtlsTransport);\n                        }\n                    }\n                    if (description.type === 'offer' && !rejected) {\n                        transceiver = pc.transceivers[sdpMLineIndex] ||\n                            pc._createTransceiver(kind);\n                        transceiver.mid = mid;\n\n                        if (!transceiver.iceGatherer) {\n                            transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n                                usingBundle);\n                        }\n\n                        if (cands.length && transceiver.iceTransport.state === 'new') {\n                            if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {\n                                transceiver.iceTransport.setRemoteCandidates(cands);\n                            } else {\n                                cands.forEach(function(candidate) {\n                                    maybeAddCandidate(transceiver.iceTransport, candidate);\n                                });\n                            }\n                        }\n\n                        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);\n\n                        // filter RTX until additional stuff needed for RTX is implemented\n                        // in adapter.js\n                        if (edgeVersion < 15019) {\n                            localCapabilities.codecs = localCapabilities.codecs.filter(\n                                function(codec) {\n                                    return codec.name !== 'rtx';\n                                });\n                        }\n\n                        sendEncodingParameters = transceiver.sendEncodingParameters || [{\n                            ssrc: (2 * sdpMLineIndex + 2) * 1001\n                        }];\n\n                        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n                        var isNewTrack = false;\n                        if (direction === 'sendrecv' || direction === 'sendonly') {\n                            isNewTrack = !transceiver.rtpReceiver;\n                            rtpReceiver = transceiver.rtpReceiver ||\n                                new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);\n\n                            if (isNewTrack) {\n                                var stream;\n                                track = rtpReceiver.track;\n                                // FIXME: does not work with Plan B.\n                                if (remoteMsid && remoteMsid.stream === '-') {\n                                    // no-op. a stream id of '-' means: no associated stream.\n                                } else if (remoteMsid) {\n                                    if (!streams[remoteMsid.stream]) {\n                                        streams[remoteMsid.stream] = new window.MediaStream();\n                                        Object.defineProperty(streams[remoteMsid.stream], 'id', {\n                                            get: function() {\n                                                return remoteMsid.stream;\n                                            }\n                                        });\n                                    }\n                                    Object.defineProperty(track, 'id', {\n                                        get: function() {\n                                            return remoteMsid.track;\n                                        }\n                                    });\n                                    stream = streams[remoteMsid.stream];\n                                } else {\n                                    if (!streams.default) {\n                                        streams.default = new window.MediaStream();\n                                    }\n                                    stream = streams.default;\n                                }\n                                if (stream) {\n                                    addTrackToStreamAndFireEvent(track, stream);\n                                    transceiver.associatedRemoteMediaStreams.push(stream);\n                                }\n                                receiverList.push([track, rtpReceiver, stream]);\n                            }\n                        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {\n                            transceiver.associatedRemoteMediaStreams.forEach(function(s) {\n                                var nativeTrack = s.getTracks().find(function(t) {\n                                    return t.id === transceiver.rtpReceiver.track.id;\n                                });\n                                if (nativeTrack) {\n                                    removeTrackFromStreamAndFireEvent(nativeTrack, s);\n                                }\n                            });\n                            transceiver.associatedRemoteMediaStreams = [];\n                        }\n\n                        transceiver.localCapabilities = localCapabilities;\n                        transceiver.remoteCapabilities = remoteCapabilities;\n                        transceiver.rtpReceiver = rtpReceiver;\n                        transceiver.rtcpParameters = rtcpParameters;\n                        transceiver.sendEncodingParameters = sendEncodingParameters;\n                        transceiver.recvEncodingParameters = recvEncodingParameters;\n\n                        // Start the RTCRtpReceiver now. The RTPSender is started in\n                        // setLocalDescription.\n                        pc._transceive(pc.transceivers[sdpMLineIndex],\n                            false,\n                            isNewTrack);\n                    } else if (description.type === 'answer' && !rejected) {\n                        transceiver = pc.transceivers[sdpMLineIndex];\n                        iceGatherer = transceiver.iceGatherer;\n                        iceTransport = transceiver.iceTransport;\n                        dtlsTransport = transceiver.dtlsTransport;\n                        rtpReceiver = transceiver.rtpReceiver;\n                        sendEncodingParameters = transceiver.sendEncodingParameters;\n                        localCapabilities = transceiver.localCapabilities;\n\n                        pc.transceivers[sdpMLineIndex].recvEncodingParameters =\n                            recvEncodingParameters;\n                        pc.transceivers[sdpMLineIndex].remoteCapabilities =\n                            remoteCapabilities;\n                        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;\n\n                        if (cands.length && iceTransport.state === 'new') {\n                            if ((isIceLite || isComplete) &&\n                                (!usingBundle || sdpMLineIndex === 0)) {\n                                iceTransport.setRemoteCandidates(cands);\n                            } else {\n                                cands.forEach(function(candidate) {\n                                    maybeAddCandidate(transceiver.iceTransport, candidate);\n                                });\n                            }\n                        }\n\n                        if (!usingBundle || sdpMLineIndex === 0) {\n                            if (iceTransport.state === 'new') {\n                                iceTransport.start(iceGatherer, remoteIceParameters,\n                                    'controlling');\n                            }\n                            if (dtlsTransport.state === 'new') {\n                                dtlsTransport.start(remoteDtlsParameters);\n                            }\n                        }\n\n                        // If the offer contained RTX but the answer did not,\n                        // remove RTX from sendEncodingParameters.\n                        var commonCapabilities = getCommonCapabilities(\n                            transceiver.localCapabilities,\n                            transceiver.remoteCapabilities);\n\n                        var hasRtx = commonCapabilities.codecs.filter(function(c) {\n                            return c.name.toLowerCase() === 'rtx';\n                        }).length;\n                        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n                            delete transceiver.sendEncodingParameters[0].rtx;\n                        }\n\n                        pc._transceive(transceiver,\n                            direction === 'sendrecv' || direction === 'recvonly',\n                            direction === 'sendrecv' || direction === 'sendonly');\n\n                        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n                        if (rtpReceiver &&\n                            (direction === 'sendrecv' || direction === 'sendonly')) {\n                            track = rtpReceiver.track;\n                            if (remoteMsid) {\n                                if (!streams[remoteMsid.stream]) {\n                                    streams[remoteMsid.stream] = new window.MediaStream();\n                                }\n                                addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);\n                                receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);\n                            } else {\n                                if (!streams.default) {\n                                    streams.default = new window.MediaStream();\n                                }\n                                addTrackToStreamAndFireEvent(track, streams.default);\n                                receiverList.push([track, rtpReceiver, streams.default]);\n                            }\n                        } else {\n                            // FIXME: actually the receiver should be created later.\n                            delete transceiver.rtpReceiver;\n                        }\n                    }\n                });\n\n                if (pc._dtlsRole === undefined) {\n                    pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';\n                }\n\n                pc._remoteDescription = {\n                    type: description.type,\n                    sdp: description.sdp\n                };\n                if (description.type === 'offer') {\n                    pc._updateSignalingState('have-remote-offer');\n                } else {\n                    pc._updateSignalingState('stable');\n                }\n                Object.keys(streams).forEach(function(sid) {\n                    var stream = streams[sid];\n                    if (stream.getTracks().length) {\n                        if (pc.remoteStreams.indexOf(stream) === -1) {\n                            pc.remoteStreams.push(stream);\n                            var event = new Event('addstream');\n                            event.stream = stream;\n                            window.setTimeout(function() {\n                                pc._dispatchEvent('addstream', event);\n                            });\n                        }\n\n                        receiverList.forEach(function(item) {\n                            var track = item[0];\n                            var receiver = item[1];\n                            if (stream.id !== item[2].id) {\n                                return;\n                            }\n                            fireAddTrack(pc, track, receiver, [stream]);\n                        });\n                    }\n                });\n                receiverList.forEach(function(item) {\n                    if (item[2]) {\n                        return;\n                    }\n                    fireAddTrack(pc, item[0], item[1], []);\n                });\n\n                // check whether addIceCandidate({}) was called within four seconds after\n                // setRemoteDescription.\n                window.setTimeout(function() {\n                    if (!(pc && pc.transceivers)) {\n                        return;\n                    }\n                    pc.transceivers.forEach(function(transceiver) {\n                        if (transceiver.iceTransport &&\n                            transceiver.iceTransport.state === 'new' &&\n                            transceiver.iceTransport.getRemoteCandidates().length > 0) {\n                            console.warn('Timeout for addRemoteCandidate. Consider sending ' +\n                                'an end-of-candidates notification');\n                            transceiver.iceTransport.addRemoteCandidate({});\n                        }\n                    });\n                }, 4000);\n\n                return Promise.resolve();\n            };\n\n            RTCPeerConnection.prototype.close = function() {\n                this.transceivers.forEach(function(transceiver) {\n                    /* not yet\n                    if (transceiver.iceGatherer) {\n                        transceiver.iceGatherer.close();\n                    }\n                    */\n                    if (transceiver.iceTransport) {\n                        transceiver.iceTransport.stop();\n                    }\n                    if (transceiver.dtlsTransport) {\n                        transceiver.dtlsTransport.stop();\n                    }\n                    if (transceiver.rtpSender) {\n                        transceiver.rtpSender.stop();\n                    }\n                    if (transceiver.rtpReceiver) {\n                        transceiver.rtpReceiver.stop();\n                    }\n                });\n                // FIXME: clean up tracks, local streams, remote streams, etc\n                this._isClosed = true;\n                this._updateSignalingState('closed');\n            };\n\n            // Update the signaling state.\n            RTCPeerConnection.prototype._updateSignalingState = function(newState) {\n                this.signalingState = newState;\n                var event = new Event('signalingstatechange');\n                this._dispatchEvent('signalingstatechange', event);\n            };\n\n            // Determine whether to fire the negotiationneeded event.\n            RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {\n                var pc = this;\n                if (this.signalingState !== 'stable' || this.needNegotiation === true) {\n                    return;\n                }\n                this.needNegotiation = true;\n                window.setTimeout(function() {\n                    if (pc.needNegotiation) {\n                        pc.needNegotiation = false;\n                        var event = new Event('negotiationneeded');\n                        pc._dispatchEvent('negotiationneeded', event);\n                    }\n                }, 0);\n            };\n\n            // Update the ice connection state.\n            RTCPeerConnection.prototype._updateIceConnectionState = function() {\n                var newState;\n                var states = {\n                    'new': 0,\n                    closed: 0,\n                    checking: 0,\n                    connected: 0,\n                    completed: 0,\n                    disconnected: 0,\n                    failed: 0\n                };\n                this.transceivers.forEach(function(transceiver) {\n                    states[transceiver.iceTransport.state]++;\n                });\n\n                newState = 'new';\n                if (states.failed > 0) {\n                    newState = 'failed';\n                } else if (states.checking > 0) {\n                    newState = 'checking';\n                } else if (states.disconnected > 0) {\n                    newState = 'disconnected';\n                } else if (states.new > 0) {\n                    newState = 'new';\n                } else if (states.connected > 0) {\n                    newState = 'connected';\n                } else if (states.completed > 0) {\n                    newState = 'completed';\n                }\n\n                if (newState !== this.iceConnectionState) {\n                    this.iceConnectionState = newState;\n                    var event = new Event('iceconnectionstatechange');\n                    this._dispatchEvent('iceconnectionstatechange', event);\n                }\n            };\n\n            // Update the connection state.\n            RTCPeerConnection.prototype._updateConnectionState = function() {\n                var newState;\n                var states = {\n                    'new': 0,\n                    closed: 0,\n                    connecting: 0,\n                    connected: 0,\n                    completed: 0,\n                    disconnected: 0,\n                    failed: 0\n                };\n                this.transceivers.forEach(function(transceiver) {\n                    states[transceiver.iceTransport.state]++;\n                    states[transceiver.dtlsTransport.state]++;\n                });\n                // ICETransport.completed and connected are the same for this purpose.\n                states.connected += states.completed;\n\n                newState = 'new';\n                if (states.failed > 0) {\n                    newState = 'failed';\n                } else if (states.connecting > 0) {\n                    newState = 'connecting';\n                } else if (states.disconnected > 0) {\n                    newState = 'disconnected';\n                } else if (states.new > 0) {\n                    newState = 'new';\n                } else if (states.connected > 0) {\n                    newState = 'connected';\n                }\n\n                if (newState !== this.connectionState) {\n                    this.connectionState = newState;\n                    var event = new Event('connectionstatechange');\n                    this._dispatchEvent('connectionstatechange', event);\n                }\n            };\n\n            RTCPeerConnection.prototype.createOffer = function() {\n                var pc = this;\n\n                if (pc._isClosed) {\n                    return Promise.reject(makeError('InvalidStateError',\n                        'Can not call createOffer after close'));\n                }\n\n                var numAudioTracks = pc.transceivers.filter(function(t) {\n                    return t.kind === 'audio';\n                }).length;\n                var numVideoTracks = pc.transceivers.filter(function(t) {\n                    return t.kind === 'video';\n                }).length;\n\n                // Determine number of audio and video tracks we need to send/recv.\n                var offerOptions = arguments[0];\n                if (offerOptions) {\n                    // Reject Chrome legacy constraints.\n                    if (offerOptions.mandatory || offerOptions.optional) {\n                        throw new TypeError(\n                            'Legacy mandatory/optional constraints not supported.');\n                    }\n                    if (offerOptions.offerToReceiveAudio !== undefined) {\n                        if (offerOptions.offerToReceiveAudio === true) {\n                            numAudioTracks = 1;\n                        } else if (offerOptions.offerToReceiveAudio === false) {\n                            numAudioTracks = 0;\n                        } else {\n                            numAudioTracks = offerOptions.offerToReceiveAudio;\n                        }\n                    }\n                    if (offerOptions.offerToReceiveVideo !== undefined) {\n                        if (offerOptions.offerToReceiveVideo === true) {\n                            numVideoTracks = 1;\n                        } else if (offerOptions.offerToReceiveVideo === false) {\n                            numVideoTracks = 0;\n                        } else {\n                            numVideoTracks = offerOptions.offerToReceiveVideo;\n                        }\n                    }\n                }\n\n                pc.transceivers.forEach(function(transceiver) {\n                    if (transceiver.kind === 'audio') {\n                        numAudioTracks--;\n                        if (numAudioTracks < 0) {\n                            transceiver.wantReceive = false;\n                        }\n                    } else if (transceiver.kind === 'video') {\n                        numVideoTracks--;\n                        if (numVideoTracks < 0) {\n                            transceiver.wantReceive = false;\n                        }\n                    }\n                });\n\n                // Create M-lines for recvonly streams.\n                while (numAudioTracks > 0 || numVideoTracks > 0) {\n                    if (numAudioTracks > 0) {\n                        pc._createTransceiver('audio');\n                        numAudioTracks--;\n                    }\n                    if (numVideoTracks > 0) {\n                        pc._createTransceiver('video');\n                        numVideoTracks--;\n                    }\n                }\n\n                var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n                    pc._sdpSessionVersion++);\n                pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n                    // For each track, create an ice gatherer, ice transport,\n                    // dtls transport, potentially rtpsender and rtpreceiver.\n                    var track = transceiver.track;\n                    var kind = transceiver.kind;\n                    var mid = transceiver.mid || SDPUtils.generateIdentifier();\n                    transceiver.mid = mid;\n\n                    if (!transceiver.iceGatherer) {\n                        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n                            pc.usingBundle);\n                    }\n\n                    var localCapabilities = window.RTCRtpSender.getCapabilities(kind);\n                    // filter RTX until additional stuff needed for RTX is implemented\n                    // in adapter.js\n                    if (edgeVersion < 15019) {\n                        localCapabilities.codecs = localCapabilities.codecs.filter(\n                            function(codec) {\n                                return codec.name !== 'rtx';\n                            });\n                    }\n                    localCapabilities.codecs.forEach(function(codec) {\n                        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552\n                        // by adding level-asymmetry-allowed=1\n                        if (codec.name === 'H264' &&\n                            codec.parameters['level-asymmetry-allowed'] === undefined) {\n                            codec.parameters['level-asymmetry-allowed'] = '1';\n                        }\n\n                        // for subsequent offers, we might have to re-use the payload\n                        // type of the last offer.\n                        if (transceiver.remoteCapabilities &&\n                            transceiver.remoteCapabilities.codecs) {\n                            transceiver.remoteCapabilities.codecs.forEach(function(remoteCodec) {\n                                if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() &&\n                                    codec.clockRate === remoteCodec.clockRate) {\n                                    codec.preferredPayloadType = remoteCodec.payloadType;\n                                }\n                            });\n                        }\n                    });\n                    localCapabilities.headerExtensions.forEach(function(hdrExt) {\n                        var remoteExtensions = transceiver.remoteCapabilities &&\n                            transceiver.remoteCapabilities.headerExtensions || [];\n                        remoteExtensions.forEach(function(rHdrExt) {\n                            if (hdrExt.uri === rHdrExt.uri) {\n                                hdrExt.id = rHdrExt.id;\n                            }\n                        });\n                    });\n\n                    // generate an ssrc now, to be used later in rtpSender.send\n                    var sendEncodingParameters = transceiver.sendEncodingParameters || [{\n                        ssrc: (2 * sdpMLineIndex + 1) * 1001\n                    }];\n                    if (track) {\n                        // add RTX\n                        if (edgeVersion >= 15019 && kind === 'video' &&\n                            !sendEncodingParameters[0].rtx) {\n                            sendEncodingParameters[0].rtx = {\n                                ssrc: sendEncodingParameters[0].ssrc + 1\n                            };\n                        }\n                    }\n\n                    if (transceiver.wantReceive) {\n                        transceiver.rtpReceiver = new window.RTCRtpReceiver(\n                            transceiver.dtlsTransport, kind);\n                    }\n\n                    transceiver.localCapabilities = localCapabilities;\n                    transceiver.sendEncodingParameters = sendEncodingParameters;\n                });\n\n                // always offer BUNDLE and dispose on return if not supported.\n                if (pc._config.bundlePolicy !== 'max-compat') {\n                    sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n                        return t.mid;\n                    }).join(' ') + '\\r\\n';\n                }\n                sdp += 'a=ice-options:trickle\\r\\n';\n\n                pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n                    sdp += writeMediaSection(transceiver, transceiver.localCapabilities,\n                        'offer', transceiver.stream, pc._dtlsRole);\n                    sdp += 'a=rtcp-rsize\\r\\n';\n\n                    if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' &&\n                        (sdpMLineIndex === 0 || !pc.usingBundle)) {\n                        transceiver.iceGatherer.getLocalCandidates().forEach(function(cand) {\n                            cand.component = 1;\n                            sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\\r\\n';\n                        });\n\n                        if (transceiver.iceGatherer.state === 'completed') {\n                            sdp += 'a=end-of-candidates\\r\\n';\n                        }\n                    }\n                });\n\n                var desc = new window.RTCSessionDescription({\n                    type: 'offer',\n                    sdp: sdp\n                });\n                return Promise.resolve(desc);\n            };\n\n            RTCPeerConnection.prototype.createAnswer = function() {\n                var pc = this;\n\n                if (pc._isClosed) {\n                    return Promise.reject(makeError('InvalidStateError',\n                        'Can not call createAnswer after close'));\n                }\n\n                if (!(pc.signalingState === 'have-remote-offer' ||\n                        pc.signalingState === 'have-local-pranswer')) {\n                    return Promise.reject(makeError('InvalidStateError',\n                        'Can not call createAnswer in signalingState ' + pc.signalingState));\n                }\n\n                var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n                    pc._sdpSessionVersion++);\n                if (pc.usingBundle) {\n                    sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n                        return t.mid;\n                    }).join(' ') + '\\r\\n';\n                }\n                sdp += 'a=ice-options:trickle\\r\\n';\n\n                var mediaSectionsInOffer = SDPUtils.getMediaSections(\n                    pc._remoteDescription.sdp).length;\n                pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n                    if (sdpMLineIndex + 1 > mediaSectionsInOffer) {\n                        return;\n                    }\n                    if (transceiver.rejected) {\n                        if (transceiver.kind === 'application') {\n                            if (transceiver.protocol === 'DTLS/SCTP') { // legacy fmt\n                                sdp += 'm=application 0 DTLS/SCTP 5000\\r\\n';\n                            } else {\n                                sdp += 'm=application 0 ' + transceiver.protocol +\n                                    ' webrtc-datachannel\\r\\n';\n                            }\n                        } else if (transceiver.kind === 'audio') {\n                            sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\\r\\n' +\n                                'a=rtpmap:0 PCMU/8000\\r\\n';\n                        } else if (transceiver.kind === 'video') {\n                            sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\\r\\n' +\n                                'a=rtpmap:120 VP8/90000\\r\\n';\n                        }\n                        sdp += 'c=IN IP4 0.0.0.0\\r\\n' +\n                            'a=inactive\\r\\n' +\n                            'a=mid:' + transceiver.mid + '\\r\\n';\n                        return;\n                    }\n\n                    // FIXME: look at direction.\n                    if (transceiver.stream) {\n                        var localTrack;\n                        if (transceiver.kind === 'audio') {\n                            localTrack = transceiver.stream.getAudioTracks()[0];\n                        } else if (transceiver.kind === 'video') {\n                            localTrack = transceiver.stream.getVideoTracks()[0];\n                        }\n                        if (localTrack) {\n                            // add RTX\n                            if (edgeVersion >= 15019 && transceiver.kind === 'video' &&\n                                !transceiver.sendEncodingParameters[0].rtx) {\n                                transceiver.sendEncodingParameters[0].rtx = {\n                                    ssrc: transceiver.sendEncodingParameters[0].ssrc + 1\n                                };\n                            }\n                        }\n                    }\n\n                    // Calculate intersection of capabilities.\n                    var commonCapabilities = getCommonCapabilities(\n                        transceiver.localCapabilities,\n                        transceiver.remoteCapabilities);\n\n                    var hasRtx = commonCapabilities.codecs.filter(function(c) {\n                        return c.name.toLowerCase() === 'rtx';\n                    }).length;\n                    if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n                        delete transceiver.sendEncodingParameters[0].rtx;\n                    }\n\n                    sdp += writeMediaSection(transceiver, commonCapabilities,\n                        'answer', transceiver.stream, pc._dtlsRole);\n                    if (transceiver.rtcpParameters &&\n                        transceiver.rtcpParameters.reducedSize) {\n                        sdp += 'a=rtcp-rsize\\r\\n';\n                    }\n                });\n\n                var desc = new window.RTCSessionDescription({\n                    type: 'answer',\n                    sdp: sdp\n                });\n                return Promise.resolve(desc);\n            };\n\n            RTCPeerConnection.prototype.addIceCandidate = function(candidate) {\n                var pc = this;\n                var sections;\n                if (candidate && !(candidate.sdpMLineIndex !== undefined ||\n                        candidate.sdpMid)) {\n                    return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));\n                }\n\n                // TODO: needs to go into ops queue.\n                return new Promise(function(resolve, reject) {\n                    if (!pc._remoteDescription) {\n                        return reject(makeError('InvalidStateError',\n                            'Can not add ICE candidate without a remote description'));\n                    } else if (!candidate || candidate.candidate === '') {\n                        for (var j = 0; j < pc.transceivers.length; j++) {\n                            if (pc.transceivers[j].rejected) {\n                                continue;\n                            }\n                            pc.transceivers[j].iceTransport.addRemoteCandidate({});\n                            sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n                            sections[j] += 'a=end-of-candidates\\r\\n';\n                            pc._remoteDescription.sdp =\n                                SDPUtils.getDescription(pc._remoteDescription.sdp) +\n                                sections.join('');\n                            if (pc.usingBundle) {\n                                break;\n                            }\n                        }\n                    } else {\n                        var sdpMLineIndex = candidate.sdpMLineIndex;\n                        if (candidate.sdpMid) {\n                            for (var i = 0; i < pc.transceivers.length; i++) {\n                                if (pc.transceivers[i].mid === candidate.sdpMid) {\n                                    sdpMLineIndex = i;\n                                    break;\n                                }\n                            }\n                        }\n                        var transceiver = pc.transceivers[sdpMLineIndex];\n                        if (transceiver) {\n                            if (transceiver.rejected) {\n                                return resolve();\n                            }\n                            var cand = Object.keys(candidate.candidate).length > 0 ?\n                                SDPUtils.parseCandidate(candidate.candidate) : {};\n                            // Ignore Chrome's invalid candidates since Edge does not like them.\n                            if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {\n                                return resolve();\n                            }\n                            // Ignore RTCP candidates, we assume RTCP-MUX.\n                            if (cand.component && cand.component !== 1) {\n                                return resolve();\n                            }\n                            // when using bundle, avoid adding candidates to the wrong\n                            // ice transport. And avoid adding candidates added in the SDP.\n                            if (sdpMLineIndex === 0 || (sdpMLineIndex > 0 &&\n                                    transceiver.iceTransport !== pc.transceivers[0].iceTransport)) {\n                                if (!maybeAddCandidate(transceiver.iceTransport, cand)) {\n                                    return reject(makeError('OperationError',\n                                        'Can not add ICE candidate'));\n                                }\n                            }\n\n                            // update the remoteDescription.\n                            var candidateString = candidate.candidate.trim();\n                            if (candidateString.indexOf('a=') === 0) {\n                                candidateString = candidateString.substr(2);\n                            }\n                            sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n                            sections[sdpMLineIndex] += 'a=' +\n                                (cand.type ? candidateString : 'end-of-candidates')\n                                + '\\r\\n';\n                            pc._remoteDescription.sdp =\n                                SDPUtils.getDescription(pc._remoteDescription.sdp) +\n                                sections.join('');\n                        } else {\n                            return reject(makeError('OperationError',\n                                'Can not add ICE candidate'));\n                        }\n                    }\n                    resolve();\n                });\n            };\n\n            RTCPeerConnection.prototype.getStats = function(selector) {\n                if (selector && selector instanceof window.MediaStreamTrack) {\n                    var senderOrReceiver = null;\n                    this.transceivers.forEach(function(transceiver) {\n                        if (transceiver.rtpSender &&\n                            transceiver.rtpSender.track === selector) {\n                            senderOrReceiver = transceiver.rtpSender;\n                        } else if (transceiver.rtpReceiver &&\n                            transceiver.rtpReceiver.track === selector) {\n                            senderOrReceiver = transceiver.rtpReceiver;\n                        }\n                    });\n                    if (!senderOrReceiver) {\n                        throw makeError('InvalidAccessError', 'Invalid selector.');\n                    }\n                    return senderOrReceiver.getStats();\n                }\n\n                var promises = [];\n                this.transceivers.forEach(function(transceiver) {\n                    ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',\n                        'dtlsTransport'].forEach(function(method) {\n                        if (transceiver[method]) {\n                            promises.push(transceiver[method].getStats());\n                        }\n                    });\n                });\n                return Promise.all(promises).then(function(allStats) {\n                    var results = new Map();\n                    allStats.forEach(function(stats) {\n                        stats.forEach(function(stat) {\n                            results.set(stat.id, stat);\n                        });\n                    });\n                    return results;\n                });\n            };\n\n            // fix low-level stat names and return Map instead of object.\n            var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer',\n                'RTCIceTransport', 'RTCDtlsTransport'];\n            ortcObjects.forEach(function(ortcObjectName) {\n                var obj = window[ortcObjectName];\n                if (obj && obj.prototype && obj.prototype.getStats) {\n                    var nativeGetstats = obj.prototype.getStats;\n                    obj.prototype.getStats = function() {\n                        return nativeGetstats.apply(this)\n                            .then(function(nativeStats) {\n                                var mapStats = new Map();\n                                Object.keys(nativeStats).forEach(function(id) {\n                                    nativeStats[id].type = fixStatsType(nativeStats[id]);\n                                    mapStats.set(id, nativeStats[id]);\n                                });\n                                return mapStats;\n                            });\n                    };\n                }\n            });\n\n            // legacy callback shims. Should be moved to adapter.js some days.\n            var methods = ['createOffer', 'createAnswer'];\n            methods.forEach(function(method) {\n                var nativeMethod = RTCPeerConnection.prototype[method];\n                RTCPeerConnection.prototype[method] = function() {\n                    var args = arguments;\n                    if (typeof args[0] === 'function' ||\n                        typeof args[1] === 'function') { // legacy\n                        return nativeMethod.apply(this, [arguments[2]])\n                            .then(function(description) {\n                                if (typeof args[0] === 'function') {\n                                    args[0].apply(null, [description]);\n                                }\n                            }, function(error) {\n                                if (typeof args[1] === 'function') {\n                                    args[1].apply(null, [error]);\n                                }\n                            });\n                    }\n                    return nativeMethod.apply(this, arguments);\n                };\n            });\n\n            methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];\n            methods.forEach(function(method) {\n                var nativeMethod = RTCPeerConnection.prototype[method];\n                RTCPeerConnection.prototype[method] = function() {\n                    var args = arguments;\n                    if (typeof args[1] === 'function' ||\n                        typeof args[2] === 'function') { // legacy\n                        return nativeMethod.apply(this, arguments)\n                            .then(function() {\n                                if (typeof args[1] === 'function') {\n                                    args[1].apply(null);\n                                }\n                            }, function(error) {\n                                if (typeof args[2] === 'function') {\n                                    args[2].apply(null, [error]);\n                                }\n                            });\n                    }\n                    return nativeMethod.apply(this, arguments);\n                };\n            });\n\n            // getStats is special. It doesn't have a spec legacy method yet we support\n            // getStats(something, cb) without error callbacks.\n            ['getStats'].forEach(function(method) {\n                var nativeMethod = RTCPeerConnection.prototype[method];\n                RTCPeerConnection.prototype[method] = function() {\n                    var args = arguments;\n                    if (typeof args[1] === 'function') {\n                        return nativeMethod.apply(this, arguments)\n                            .then(function() {\n                                if (typeof args[1] === 'function') {\n                                    args[1].apply(null);\n                                }\n                            });\n                    }\n                    return nativeMethod.apply(this, arguments);\n                };\n            });\n\n            return RTCPeerConnection;\n        };\n\n    },{\"sdp\":2}],2:[function(require,module,exports){\n        /* eslint-env node */\n        'use strict';\n\n        // SDP helpers.\n        var SDPUtils = {};\n\n        // Generate an alphanumeric identifier for cname or mids.\n        // TODO: use UUIDs instead? https://gist.github.com/jed/982883\n        SDPUtils.generateIdentifier = function() {\n            return Math.random().toString(36).substr(2, 10);\n        };\n\n        // The RTCP CNAME used by all peerconnections from the same JS.\n        SDPUtils.localCName = SDPUtils.generateIdentifier();\n\n        // Splits SDP into lines, dealing with both CRLF and LF.\n        SDPUtils.splitLines = function(blob) {\n            return blob.trim().split('\\n').map(function(line) {\n                return line.trim();\n            });\n        };\n        // Splits SDP into sessionpart and mediasections. Ensures CRLF.\n        SDPUtils.splitSections = function(blob) {\n            var parts = blob.split('\\nm=');\n            return parts.map(function(part, index) {\n                return (index > 0 ? 'm=' + part : part).trim() + '\\r\\n';\n            });\n        };\n\n        // returns the session description.\n        SDPUtils.getDescription = function(blob) {\n            var sections = SDPUtils.splitSections(blob);\n            return sections && sections[0];\n        };\n\n        // returns the individual media sections.\n        SDPUtils.getMediaSections = function(blob) {\n            var sections = SDPUtils.splitSections(blob);\n            sections.shift();\n            return sections;\n        };\n\n        // Returns lines that start with a certain prefix.\n        SDPUtils.matchPrefix = function(blob, prefix) {\n            return SDPUtils.splitLines(blob).filter(function(line) {\n                return line.indexOf(prefix) === 0;\n            });\n        };\n\n        // Parses an ICE candidate line. Sample input:\n        // candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8\n        // rport 55996\"\n        SDPUtils.parseCandidate = function(line) {\n            var parts;\n            // Parse both variants.\n            if (line.indexOf('a=candidate:') === 0) {\n                parts = line.substring(12).split(' ');\n            } else {\n                parts = line.substring(10).split(' ');\n            }\n\n            var candidate = {\n                foundation: parts[0],\n                component: parseInt(parts[1], 10),\n                protocol: parts[2].toLowerCase(),\n                priority: parseInt(parts[3], 10),\n                ip: parts[4],\n                address: parts[4], // address is an alias for ip.\n                port: parseInt(parts[5], 10),\n                // skip parts[6] == 'typ'\n                type: parts[7]\n            };\n\n            for (var i = 8; i < parts.length; i += 2) {\n                switch (parts[i]) {\n                    case 'raddr':\n                        candidate.relatedAddress = parts[i + 1];\n                        break;\n                    case 'rport':\n                        candidate.relatedPort = parseInt(parts[i + 1], 10);\n                        break;\n                    case 'tcptype':\n                        candidate.tcpType = parts[i + 1];\n                        break;\n                    case 'ufrag':\n                        candidate.ufrag = parts[i + 1]; // for backward compability.\n                        candidate.usernameFragment = parts[i + 1];\n                        break;\n                    default: // extension handling, in particular ufrag\n                        candidate[parts[i]] = parts[i + 1];\n                        break;\n                }\n            }\n            return candidate;\n        };\n\n        // Translates a candidate object into SDP candidate attribute.\n        SDPUtils.writeCandidate = function(candidate) {\n            var sdp = [];\n            sdp.push(candidate.foundation);\n            sdp.push(candidate.component);\n            sdp.push(candidate.protocol.toUpperCase());\n            sdp.push(candidate.priority);\n            sdp.push(candidate.address || candidate.ip);\n            sdp.push(candidate.port);\n\n            var type = candidate.type;\n            sdp.push('typ');\n            sdp.push(type);\n            if (type !== 'host' && candidate.relatedAddress &&\n                candidate.relatedPort) {\n                sdp.push('raddr');\n                sdp.push(candidate.relatedAddress);\n                sdp.push('rport');\n                sdp.push(candidate.relatedPort);\n            }\n            if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {\n                sdp.push('tcptype');\n                sdp.push(candidate.tcpType);\n            }\n            if (candidate.usernameFragment || candidate.ufrag) {\n                sdp.push('ufrag');\n                sdp.push(candidate.usernameFragment || candidate.ufrag);\n            }\n            return 'candidate:' + sdp.join(' ');\n        };\n\n        // Parses an ice-options line, returns an array of option tags.\n        // a=ice-options:foo bar\n        SDPUtils.parseIceOptions = function(line) {\n            return line.substr(14).split(' ');\n        };\n\n        // Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:\n        // a=rtpmap:111 opus/48000/2\n        SDPUtils.parseRtpMap = function(line) {\n            var parts = line.substr(9).split(' ');\n            var parsed = {\n                payloadType: parseInt(parts.shift(), 10) // was: id\n            };\n\n            parts = parts[0].split('/');\n\n            parsed.name = parts[0];\n            parsed.clockRate = parseInt(parts[1], 10); // was: clockrate\n            parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;\n            // legacy alias, got renamed back to channels in ORTC.\n            parsed.numChannels = parsed.channels;\n            return parsed;\n        };\n\n        // Generate an a=rtpmap line from RTCRtpCodecCapability or\n        // RTCRtpCodecParameters.\n        SDPUtils.writeRtpMap = function(codec) {\n            var pt = codec.payloadType;\n            if (codec.preferredPayloadType !== undefined) {\n                pt = codec.preferredPayloadType;\n            }\n            var channels = codec.channels || codec.numChannels || 1;\n            return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +\n                (channels !== 1 ? '/' + channels : '') + '\\r\\n';\n        };\n\n        // Parses an a=extmap line (headerextension from RFC 5285). Sample input:\n        // a=extmap:2 urn:ietf:params:rtp-hdrext:toffset\n        // a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset\n        SDPUtils.parseExtmap = function(line) {\n            var parts = line.substr(9).split(' ');\n            return {\n                id: parseInt(parts[0], 10),\n                direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',\n                uri: parts[1]\n            };\n        };\n\n        // Generates a=extmap line from RTCRtpHeaderExtensionParameters or\n        // RTCRtpHeaderExtension.\n        SDPUtils.writeExtmap = function(headerExtension) {\n            return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +\n                (headerExtension.direction && headerExtension.direction !== 'sendrecv'\n                    ? '/' + headerExtension.direction\n                    : '') +\n                ' ' + headerExtension.uri + '\\r\\n';\n        };\n\n        // Parses an ftmp line, returns dictionary. Sample input:\n        // a=fmtp:96 vbr=on;cng=on\n        // Also deals with vbr=on; cng=on\n        SDPUtils.parseFmtp = function(line) {\n            var parsed = {};\n            var kv;\n            var parts = line.substr(line.indexOf(' ') + 1).split(';');\n            for (var j = 0; j < parts.length; j++) {\n                kv = parts[j].trim().split('=');\n                parsed[kv[0].trim()] = kv[1];\n            }\n            return parsed;\n        };\n\n        // Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.\n        SDPUtils.writeFmtp = function(codec) {\n            var line = '';\n            var pt = codec.payloadType;\n            if (codec.preferredPayloadType !== undefined) {\n                pt = codec.preferredPayloadType;\n            }\n            if (codec.parameters && Object.keys(codec.parameters).length) {\n                var params = [];\n                Object.keys(codec.parameters).forEach(function(param) {\n                    if (codec.parameters[param]) {\n                        params.push(param + '=' + codec.parameters[param]);\n                    } else {\n                        params.push(param);\n                    }\n                });\n                line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\\r\\n';\n            }\n            return line;\n        };\n\n        // Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:\n        // a=rtcp-fb:98 nack rpsi\n        SDPUtils.parseRtcpFb = function(line) {\n            var parts = line.substr(line.indexOf(' ') + 1).split(' ');\n            return {\n                type: parts.shift(),\n                parameter: parts.join(' ')\n            };\n        };\n        // Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.\n        SDPUtils.writeRtcpFb = function(codec) {\n            var lines = '';\n            var pt = codec.payloadType;\n            if (codec.preferredPayloadType !== undefined) {\n                pt = codec.preferredPayloadType;\n            }\n            if (codec.rtcpFeedback && codec.rtcpFeedback.length) {\n                // FIXME: special handling for trr-int?\n                codec.rtcpFeedback.forEach(function(fb) {\n                    lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +\n                        (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +\n                        '\\r\\n';\n                });\n            }\n            return lines;\n        };\n\n        // Parses an RFC 5576 ssrc media attribute. Sample input:\n        // a=ssrc:3735928559 cname:something\n        SDPUtils.parseSsrcMedia = function(line) {\n            var sp = line.indexOf(' ');\n            var parts = {\n                ssrc: parseInt(line.substr(7, sp - 7), 10)\n            };\n            var colon = line.indexOf(':', sp);\n            if (colon > -1) {\n                parts.attribute = line.substr(sp + 1, colon - sp - 1);\n                parts.value = line.substr(colon + 1);\n            } else {\n                parts.attribute = line.substr(sp + 1);\n            }\n            return parts;\n        };\n\n        SDPUtils.parseSsrcGroup = function(line) {\n            var parts = line.substr(13).split(' ');\n            return {\n                semantics: parts.shift(),\n                ssrcs: parts.map(function(ssrc) {\n                    return parseInt(ssrc, 10);\n                })\n            };\n        };\n\n        // Extracts the MID (RFC 5888) from a media section.\n        // returns the MID or undefined if no mid line was found.\n        SDPUtils.getMid = function(mediaSection) {\n            var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];\n            if (mid) {\n                return mid.substr(6);\n            }\n        };\n\n        SDPUtils.parseFingerprint = function(line) {\n            var parts = line.substr(14).split(' ');\n            return {\n                algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.\n                value: parts[1]\n            };\n        };\n\n        // Extracts DTLS parameters from SDP media section or sessionpart.\n        // FIXME: for consistency with other functions this should only\n        //   get the fingerprint line as input. See also getIceParameters.\n        SDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {\n            var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,\n                'a=fingerprint:');\n            // Note: a=setup line is ignored since we use the 'auto' role.\n            // Note2: 'algorithm' is not case sensitive except in Edge.\n            return {\n                role: 'auto',\n                fingerprints: lines.map(SDPUtils.parseFingerprint)\n            };\n        };\n\n        // Serializes DTLS parameters to SDP.\n        SDPUtils.writeDtlsParameters = function(params, setupType) {\n            var sdp = 'a=setup:' + setupType + '\\r\\n';\n            params.fingerprints.forEach(function(fp) {\n                sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\\r\\n';\n            });\n            return sdp;\n        };\n        // Parses ICE information from SDP media section or sessionpart.\n        // FIXME: for consistency with other functions this should only\n        //   get the ice-ufrag and ice-pwd lines as input.\n        SDPUtils.getIceParameters = function(mediaSection, sessionpart) {\n            var lines = SDPUtils.splitLines(mediaSection);\n            // Search in session part, too.\n            lines = lines.concat(SDPUtils.splitLines(sessionpart));\n            var iceParameters = {\n                usernameFragment: lines.filter(function(line) {\n                    return line.indexOf('a=ice-ufrag:') === 0;\n                })[0].substr(12),\n                password: lines.filter(function(line) {\n                    return line.indexOf('a=ice-pwd:') === 0;\n                })[0].substr(10)\n            };\n            return iceParameters;\n        };\n\n        // Serializes ICE parameters to SDP.\n        SDPUtils.writeIceParameters = function(params) {\n            return 'a=ice-ufrag:' + params.usernameFragment + '\\r\\n' +\n                'a=ice-pwd:' + params.password + '\\r\\n';\n        };\n\n        // Parses the SDP media section and returns RTCRtpParameters.\n        SDPUtils.parseRtpParameters = function(mediaSection) {\n            var description = {\n                codecs: [],\n                headerExtensions: [],\n                fecMechanisms: [],\n                rtcp: []\n            };\n            var lines = SDPUtils.splitLines(mediaSection);\n            var mline = lines[0].split(' ');\n            for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]\n                var pt = mline[i];\n                var rtpmapline = SDPUtils.matchPrefix(\n                    mediaSection, 'a=rtpmap:' + pt + ' ')[0];\n                if (rtpmapline) {\n                    var codec = SDPUtils.parseRtpMap(rtpmapline);\n                    var fmtps = SDPUtils.matchPrefix(\n                        mediaSection, 'a=fmtp:' + pt + ' ');\n                    // Only the first a=fmtp:<pt> is considered.\n                    codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};\n                    codec.rtcpFeedback = SDPUtils.matchPrefix(\n                        mediaSection, 'a=rtcp-fb:' + pt + ' ')\n                        .map(SDPUtils.parseRtcpFb);\n                    description.codecs.push(codec);\n                    // parse FEC mechanisms from rtpmap lines.\n                    switch (codec.name.toUpperCase()) {\n                        case 'RED':\n                        case 'ULPFEC':\n                            description.fecMechanisms.push(codec.name.toUpperCase());\n                            break;\n                        default: // only RED and ULPFEC are recognized as FEC mechanisms.\n                            break;\n                    }\n                }\n            }\n            SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {\n                description.headerExtensions.push(SDPUtils.parseExtmap(line));\n            });\n            // FIXME: parse rtcp.\n            return description;\n        };\n\n        // Generates parts of the SDP media section describing the capabilities /\n        // parameters.\n        SDPUtils.writeRtpDescription = function(kind, caps) {\n            var sdp = '';\n\n            // Build the mline.\n            sdp += 'm=' + kind + ' ';\n            sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.\n            sdp += ' UDP/TLS/RTP/SAVPF ';\n            sdp += caps.codecs.map(function(codec) {\n                if (codec.preferredPayloadType !== undefined) {\n                    return codec.preferredPayloadType;\n                }\n                return codec.payloadType;\n            }).join(' ') + '\\r\\n';\n\n            sdp += 'c=IN IP4 0.0.0.0\\r\\n';\n            sdp += 'a=rtcp:9 IN IP4 0.0.0.0\\r\\n';\n\n            // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.\n            caps.codecs.forEach(function(codec) {\n                sdp += SDPUtils.writeRtpMap(codec);\n                sdp += SDPUtils.writeFmtp(codec);\n                sdp += SDPUtils.writeRtcpFb(codec);\n            });\n            var maxptime = 0;\n            caps.codecs.forEach(function(codec) {\n                if (codec.maxptime > maxptime) {\n                    maxptime = codec.maxptime;\n                }\n            });\n            if (maxptime > 0) {\n                sdp += 'a=maxptime:' + maxptime + '\\r\\n';\n            }\n            sdp += 'a=rtcp-mux\\r\\n';\n\n            if (caps.headerExtensions) {\n                caps.headerExtensions.forEach(function(extension) {\n                    sdp += SDPUtils.writeExtmap(extension);\n                });\n            }\n            // FIXME: write fecMechanisms.\n            return sdp;\n        };\n\n        // Parses the SDP media section and returns an array of\n        // RTCRtpEncodingParameters.\n        SDPUtils.parseRtpEncodingParameters = function(mediaSection) {\n            var encodingParameters = [];\n            var description = SDPUtils.parseRtpParameters(mediaSection);\n            var hasRed = description.fecMechanisms.indexOf('RED') !== -1;\n            var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;\n\n            // filter a=ssrc:... cname:, ignore PlanB-msid\n            var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n                .map(function(line) {\n                    return SDPUtils.parseSsrcMedia(line);\n                })\n                .filter(function(parts) {\n                    return parts.attribute === 'cname';\n                });\n            var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;\n            var secondarySsrc;\n\n            var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')\n                .map(function(line) {\n                    var parts = line.substr(17).split(' ');\n                    return parts.map(function(part) {\n                        return parseInt(part, 10);\n                    });\n                });\n            if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {\n                secondarySsrc = flows[0][1];\n            }\n\n            description.codecs.forEach(function(codec) {\n                if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {\n                    var encParam = {\n                        ssrc: primarySsrc,\n                        codecPayloadType: parseInt(codec.parameters.apt, 10)\n                    };\n                    if (primarySsrc && secondarySsrc) {\n                        encParam.rtx = {ssrc: secondarySsrc};\n                    }\n                    encodingParameters.push(encParam);\n                    if (hasRed) {\n                        encParam = JSON.parse(JSON.stringify(encParam));\n                        encParam.fec = {\n                            ssrc: primarySsrc,\n                            mechanism: hasUlpfec ? 'red+ulpfec' : 'red'\n                        };\n                        encodingParameters.push(encParam);\n                    }\n                }\n            });\n            if (encodingParameters.length === 0 && primarySsrc) {\n                encodingParameters.push({\n                    ssrc: primarySsrc\n                });\n            }\n\n            // we support both b=AS and b=TIAS but interpret AS as TIAS.\n            var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');\n            if (bandwidth.length) {\n                if (bandwidth[0].indexOf('b=TIAS:') === 0) {\n                    bandwidth = parseInt(bandwidth[0].substr(7), 10);\n                } else if (bandwidth[0].indexOf('b=AS:') === 0) {\n                    // use formula from JSEP to convert b=AS to TIAS value.\n                    bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95\n                        - (50 * 40 * 8);\n                } else {\n                    bandwidth = undefined;\n                }\n                encodingParameters.forEach(function(params) {\n                    params.maxBitrate = bandwidth;\n                });\n            }\n            return encodingParameters;\n        };\n\n        // parses http://draft.ortc.org/#rtcrtcpparameters*\n        SDPUtils.parseRtcpParameters = function(mediaSection) {\n            var rtcpParameters = {};\n\n            // Gets the first SSRC. Note tha with RTX there might be multiple\n            // SSRCs.\n            var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n                .map(function(line) {\n                    return SDPUtils.parseSsrcMedia(line);\n                })\n                .filter(function(obj) {\n                    return obj.attribute === 'cname';\n                })[0];\n            if (remoteSsrc) {\n                rtcpParameters.cname = remoteSsrc.value;\n                rtcpParameters.ssrc = remoteSsrc.ssrc;\n            }\n\n            // Edge uses the compound attribute instead of reducedSize\n            // compound is !reducedSize\n            var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');\n            rtcpParameters.reducedSize = rsize.length > 0;\n            rtcpParameters.compound = rsize.length === 0;\n\n            // parses the rtcp-mux attrіbute.\n            // Note that Edge does not support unmuxed RTCP.\n            var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');\n            rtcpParameters.mux = mux.length > 0;\n\n            return rtcpParameters;\n        };\n\n        // parses either a=msid: or a=ssrc:... msid lines and returns\n        // the id of the MediaStream and MediaStreamTrack.\n        SDPUtils.parseMsid = function(mediaSection) {\n            var parts;\n            var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');\n            if (spec.length === 1) {\n                parts = spec[0].substr(7).split(' ');\n                return {stream: parts[0], track: parts[1]};\n            }\n            var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n                .map(function(line) {\n                    return SDPUtils.parseSsrcMedia(line);\n                })\n                .filter(function(msidParts) {\n                    return msidParts.attribute === 'msid';\n                });\n            if (planB.length > 0) {\n                parts = planB[0].value.split(' ');\n                return {stream: parts[0], track: parts[1]};\n            }\n        };\n\n        // Generate a session ID for SDP.\n        // https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1\n        // recommends using a cryptographically random +ve 64-bit value\n        // but right now this should be acceptable and within the right range\n        SDPUtils.generateSessionId = function() {\n            return Math.random().toString().substr(2, 21);\n        };\n\n        // Write boilder plate for start of SDP\n        // sessId argument is optional - if not supplied it will\n        // be generated randomly\n        // sessVersion is optional and defaults to 2\n        // sessUser is optional and defaults to 'thisisadapterortc'\n        SDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {\n            var sessionId;\n            var version = sessVer !== undefined ? sessVer : 2;\n            if (sessId) {\n                sessionId = sessId;\n            } else {\n                sessionId = SDPUtils.generateSessionId();\n            }\n            var user = sessUser || 'thisisadapterortc';\n            // FIXME: sess-id should be an NTP timestamp.\n            return 'v=0\\r\\n' +\n                'o=' + user + ' ' + sessionId + ' ' + version +\n                ' IN IP4 127.0.0.1\\r\\n' +\n                's=-\\r\\n' +\n                't=0 0\\r\\n';\n        };\n\n        SDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {\n            var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n            // Map ICE parameters (ufrag, pwd) to SDP.\n            sdp += SDPUtils.writeIceParameters(\n                transceiver.iceGatherer.getLocalParameters());\n\n            // Map DTLS parameters to SDP.\n            sdp += SDPUtils.writeDtlsParameters(\n                transceiver.dtlsTransport.getLocalParameters(),\n                type === 'offer' ? 'actpass' : 'active');\n\n            sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n            if (transceiver.direction) {\n                sdp += 'a=' + transceiver.direction + '\\r\\n';\n            } else if (transceiver.rtpSender && transceiver.rtpReceiver) {\n                sdp += 'a=sendrecv\\r\\n';\n            } else if (transceiver.rtpSender) {\n                sdp += 'a=sendonly\\r\\n';\n            } else if (transceiver.rtpReceiver) {\n                sdp += 'a=recvonly\\r\\n';\n            } else {\n                sdp += 'a=inactive\\r\\n';\n            }\n\n            if (transceiver.rtpSender) {\n                // spec.\n                var msid = 'msid:' + stream.id + ' ' +\n                    transceiver.rtpSender.track.id + '\\r\\n';\n                sdp += 'a=' + msid;\n\n                // for Chrome.\n                sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n                    ' ' + msid;\n                if (transceiver.sendEncodingParameters[0].rtx) {\n                    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n                        ' ' + msid;\n                    sdp += 'a=ssrc-group:FID ' +\n                        transceiver.sendEncodingParameters[0].ssrc + ' ' +\n                        transceiver.sendEncodingParameters[0].rtx.ssrc +\n                        '\\r\\n';\n                }\n            }\n            // FIXME: this should be written by writeRtpDescription.\n            sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n                ' cname:' + SDPUtils.localCName + '\\r\\n';\n            if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n                sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n                    ' cname:' + SDPUtils.localCName + '\\r\\n';\n            }\n            return sdp;\n        };\n\n        // Gets the direction from the mediaSection or the sessionpart.\n        SDPUtils.getDirection = function(mediaSection, sessionpart) {\n            // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.\n            var lines = SDPUtils.splitLines(mediaSection);\n            for (var i = 0; i < lines.length; i++) {\n                switch (lines[i]) {\n                    case 'a=sendrecv':\n                    case 'a=sendonly':\n                    case 'a=recvonly':\n                    case 'a=inactive':\n                        return lines[i].substr(2);\n                    default:\n                    // FIXME: What should happen here?\n                }\n            }\n            if (sessionpart) {\n                return SDPUtils.getDirection(sessionpart);\n            }\n            return 'sendrecv';\n        };\n\n        SDPUtils.getKind = function(mediaSection) {\n            var lines = SDPUtils.splitLines(mediaSection);\n            var mline = lines[0].split(' ');\n            return mline[0].substr(2);\n        };\n\n        SDPUtils.isRejected = function(mediaSection) {\n            return mediaSection.split(' ', 2)[1] === '0';\n        };\n\n        SDPUtils.parseMLine = function(mediaSection) {\n            var lines = SDPUtils.splitLines(mediaSection);\n            var parts = lines[0].substr(2).split(' ');\n            return {\n                kind: parts[0],\n                port: parseInt(parts[1], 10),\n                protocol: parts[2],\n                fmt: parts.slice(3).join(' ')\n            };\n        };\n\n        SDPUtils.parseOLine = function(mediaSection) {\n            var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];\n            var parts = line.substr(2).split(' ');\n            return {\n                username: parts[0],\n                sessionId: parts[1],\n                sessionVersion: parseInt(parts[2], 10),\n                netType: parts[3],\n                addressType: parts[4],\n                address: parts[5]\n            };\n        };\n\n        // a very naive interpretation of a valid SDP.\n        SDPUtils.isValidSDP = function(blob) {\n            if (typeof blob !== 'string' || blob.length === 0) {\n                return false;\n            }\n            var lines = SDPUtils.splitLines(blob);\n            for (var i = 0; i < lines.length; i++) {\n                if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {\n                    return false;\n                }\n                // TODO: check the modifier a bit more.\n            }\n            return true;\n        };\n\n        // Expose public methods.\n        if (typeof module === 'object') {\n            module.exports = SDPUtils;\n        }\n\n    },{}],3:[function(require,module,exports){\n        (function (global){\n            /*\n             *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n             *\n             *  Use of this source code is governed by a BSD-style license\n             *  that can be found in the LICENSE file in the root of the source\n             *  tree.\n             */\n            /* eslint-env node */\n\n            'use strict';\n\n            var adapterFactory = require('./adapter_factory.js');\n            module.exports = adapterFactory({window: global.window});\n\n        }).call(this,typeof global !== \"undefined\" ? global : typeof self !== \"undefined\" ? self : typeof window !== \"undefined\" ? window : {})\n    },{\"./adapter_factory.js\":4}],4:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n\n        'use strict';\n\n        var utils = require('./utils');\n        // Shimming starts here.\n        module.exports = function(dependencies, opts) {\n            var window = dependencies && dependencies.window;\n\n            var options = {\n                shimChrome: true,\n                shimFirefox: true,\n                shimEdge: true,\n                shimSafari: true,\n            };\n\n            for (var key in opts) {\n                if (hasOwnProperty.call(opts, key)) {\n                    options[key] = opts[key];\n                }\n            }\n\n            // Utils.\n            var logging = utils.log;\n            var browserDetails = utils.detectBrowser(window);\n\n            // Uncomment the line below if you want logging to occur, including logging\n            // for the switch statement below. Can also be turned on in the browser via\n            // adapter.disableLog(false), but then logging from the switch statement below\n            // will not appear.\n            // require('./utils').disableLog(false);\n\n            // Browser shims.\n            var chromeShim = require('./chrome/chrome_shim') || null;\n            var edgeShim = require('./edge/edge_shim') || null;\n            var firefoxShim = require('./firefox/firefox_shim') || null;\n            var safariShim = require('./safari/safari_shim') || null;\n            var commonShim = require('./common_shim') || null;\n\n            // Export to the adapter global object visible in the browser.\n            var adapter = {\n                browserDetails: browserDetails,\n                commonShim: commonShim,\n                extractVersion: utils.extractVersion,\n                disableLog: utils.disableLog,\n                disableWarnings: utils.disableWarnings\n            };\n\n            // Shim browser if found.\n            switch (browserDetails.browser) {\n                case 'chrome':\n                    if (!chromeShim || !chromeShim.shimPeerConnection ||\n                        !options.shimChrome) {\n                        logging('Chrome shim is not included in this adapter release.');\n                        return adapter;\n                    }\n                    logging('adapter.js shimming chrome.');\n                    // Export to the adapter global object visible in the browser.\n                    adapter.browserShim = chromeShim;\n                    commonShim.shimCreateObjectURL(window);\n\n                    chromeShim.shimGetUserMedia(window);\n                    chromeShim.shimMediaStream(window);\n                    chromeShim.shimSourceObject(window);\n                    chromeShim.shimPeerConnection(window);\n                    chromeShim.shimOnTrack(window);\n                    chromeShim.shimAddTrackRemoveTrack(window);\n                    chromeShim.shimGetSendersWithDtmf(window);\n                    chromeShim.shimSenderReceiverGetStats(window);\n                    chromeShim.fixNegotiationNeeded(window);\n\n                    commonShim.shimRTCIceCandidate(window);\n                    commonShim.shimMaxMessageSize(window);\n                    commonShim.shimSendThrowTypeError(window);\n                    break;\n                case 'firefox':\n                    if (!firefoxShim || !firefoxShim.shimPeerConnection ||\n                        !options.shimFirefox) {\n                        logging('Firefox shim is not included in this adapter release.');\n                        return adapter;\n                    }\n                    logging('adapter.js shimming firefox.');\n                    // Export to the adapter global object visible in the browser.\n                    adapter.browserShim = firefoxShim;\n                    commonShim.shimCreateObjectURL(window);\n\n                    firefoxShim.shimGetUserMedia(window);\n                    firefoxShim.shimSourceObject(window);\n                    firefoxShim.shimPeerConnection(window);\n                    firefoxShim.shimOnTrack(window);\n                    firefoxShim.shimRemoveStream(window);\n                    firefoxShim.shimSenderGetStats(window);\n                    firefoxShim.shimReceiverGetStats(window);\n                    firefoxShim.shimRTCDataChannel(window);\n\n                    commonShim.shimRTCIceCandidate(window);\n                    commonShim.shimMaxMessageSize(window);\n                    commonShim.shimSendThrowTypeError(window);\n                    break;\n                case 'edge':\n                    if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {\n                        logging('MS edge shim is not included in this adapter release.');\n                        return adapter;\n                    }\n                    logging('adapter.js shimming edge.');\n                    // Export to the adapter global object visible in the browser.\n                    adapter.browserShim = edgeShim;\n                    commonShim.shimCreateObjectURL(window);\n\n                    edgeShim.shimGetUserMedia(window);\n                    edgeShim.shimPeerConnection(window);\n                    edgeShim.shimReplaceTrack(window);\n\n                    // the edge shim implements the full RTCIceCandidate object.\n\n                    commonShim.shimMaxMessageSize(window);\n                    commonShim.shimSendThrowTypeError(window);\n                    break;\n                case 'safari':\n                    if (!safariShim || !options.shimSafari) {\n                        logging('Safari shim is not included in this adapter release.');\n                        return adapter;\n                    }\n                    logging('adapter.js shimming safari.');\n                    // Export to the adapter global object visible in the browser.\n                    adapter.browserShim = safariShim;\n                    commonShim.shimCreateObjectURL(window);\n\n                    safariShim.shimRTCIceServerUrls(window);\n                    safariShim.shimCreateOfferLegacy(window);\n                    safariShim.shimCallbacksAPI(window);\n                    safariShim.shimLocalStreamsAPI(window);\n                    safariShim.shimRemoteStreamsAPI(window);\n                    safariShim.shimTrackEventTransceiver(window);\n                    safariShim.shimGetUserMedia(window);\n\n                    commonShim.shimRTCIceCandidate(window);\n                    commonShim.shimMaxMessageSize(window);\n                    commonShim.shimSendThrowTypeError(window);\n                    break;\n                default:\n                    logging('Unsupported browser!');\n                    break;\n            }\n\n            return adapter;\n        };\n\n    },{\"./chrome/chrome_shim\":5,\"./common_shim\":7,\"./edge/edge_shim\":8,\"./firefox/firefox_shim\":11,\"./safari/safari_shim\":13,\"./utils\":14}],5:[function(require,module,exports){\n\n        /*\n         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n        'use strict';\n        var utils = require('../utils.js');\n        var logging = utils.log;\n\n        /* iterates the stats graph recursively. */\n        function walkStats(stats, base, resultSet) {\n            if (!base || resultSet.has(base.id)) {\n                return;\n            }\n            resultSet.set(base.id, base);\n            Object.keys(base).forEach(function(name) {\n                if (name.endsWith('Id')) {\n                    walkStats(stats, stats.get(base[name]), resultSet);\n                } else if (name.endsWith('Ids')) {\n                    base[name].forEach(function(id) {\n                        walkStats(stats, stats.get(id), resultSet);\n                    });\n                }\n            });\n        }\n\n        /* filter getStats for a sender/receiver track. */\n        function filterStats(result, track, outbound) {\n            var streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';\n            var filteredResult = new Map();\n            if (track === null) {\n                return filteredResult;\n            }\n            var trackStats = [];\n            result.forEach(function(value) {\n                if (value.type === 'track' &&\n                    value.trackIdentifier === track.id) {\n                    trackStats.push(value);\n                }\n            });\n            trackStats.forEach(function(trackStat) {\n                result.forEach(function(stats) {\n                    if (stats.type === streamStatsType && stats.trackId === trackStat.id) {\n                        walkStats(result, stats, filteredResult);\n                    }\n                });\n            });\n            return filteredResult;\n        }\n\n        module.exports = {\n            shimGetUserMedia: require('./getusermedia'),\n            shimMediaStream: function(window) {\n                window.MediaStream = window.MediaStream || window.webkitMediaStream;\n            },\n\n            shimOnTrack: function(window) {\n                if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in\n                        window.RTCPeerConnection.prototype)) {\n                    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {\n                        get: function() {\n                            return this._ontrack;\n                        },\n                        set: function(f) {\n                            if (this._ontrack) {\n                                this.removeEventListener('track', this._ontrack);\n                            }\n                            this.addEventListener('track', this._ontrack = f);\n                        },\n                        enumerable: true,\n                        configurable: true\n                    });\n                    var origSetRemoteDescription =\n                        window.RTCPeerConnection.prototype.setRemoteDescription;\n                    window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n                        var pc = this;\n                        if (!pc._ontrackpoly) {\n                            pc._ontrackpoly = function(e) {\n                                // onaddstream does not fire when a track is added to an existing\n                                // stream. But stream.onaddtrack is implemented so we use that.\n                                e.stream.addEventListener('addtrack', function(te) {\n                                    var receiver;\n                                    if (window.RTCPeerConnection.prototype.getReceivers) {\n                                        receiver = pc.getReceivers().find(function(r) {\n                                            return r.track && r.track.id === te.track.id;\n                                        });\n                                    } else {\n                                        receiver = {track: te.track};\n                                    }\n\n                                    var event = new Event('track');\n                                    event.track = te.track;\n                                    event.receiver = receiver;\n                                    event.transceiver = {receiver: receiver};\n                                    event.streams = [e.stream];\n                                    pc.dispatchEvent(event);\n                                });\n                                e.stream.getTracks().forEach(function(track) {\n                                    var receiver;\n                                    if (window.RTCPeerConnection.prototype.getReceivers) {\n                                        receiver = pc.getReceivers().find(function(r) {\n                                            return r.track && r.track.id === track.id;\n                                        });\n                                    } else {\n                                        receiver = {track: track};\n                                    }\n                                    var event = new Event('track');\n                                    event.track = track;\n                                    event.receiver = receiver;\n                                    event.transceiver = {receiver: receiver};\n                                    event.streams = [e.stream];\n                                    pc.dispatchEvent(event);\n                                });\n                            };\n                            pc.addEventListener('addstream', pc._ontrackpoly);\n                        }\n                        return origSetRemoteDescription.apply(pc, arguments);\n                    };\n                } else {\n                    // even if RTCRtpTransceiver is in window, it is only used and\n                    // emitted in unified-plan. Unfortunately this means we need\n                    // to unconditionally wrap the event.\n                    utils.wrapPeerConnectionEvent(window, 'track', function(e) {\n                        if (!e.transceiver) {\n                            Object.defineProperty(e, 'transceiver',\n                                {value: {receiver: e.receiver}});\n                        }\n                        return e;\n                    });\n                }\n            },\n\n            shimGetSendersWithDtmf: function(window) {\n                // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.\n                if (typeof window === 'object' && window.RTCPeerConnection &&\n                    !('getSenders' in window.RTCPeerConnection.prototype) &&\n                    'createDTMFSender' in window.RTCPeerConnection.prototype) {\n                    var shimSenderWithDtmf = function(pc, track) {\n                        return {\n                            track: track,\n                            get dtmf() {\n                                if (this._dtmf === undefined) {\n                                    if (track.kind === 'audio') {\n                                        this._dtmf = pc.createDTMFSender(track);\n                                    } else {\n                                        this._dtmf = null;\n                                    }\n                                }\n                                return this._dtmf;\n                            },\n                            _pc: pc\n                        };\n                    };\n\n                    // augment addTrack when getSenders is not available.\n                    if (!window.RTCPeerConnection.prototype.getSenders) {\n                        window.RTCPeerConnection.prototype.getSenders = function() {\n                            this._senders = this._senders || [];\n                            return this._senders.slice(); // return a copy of the internal state.\n                        };\n                        var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n                        window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n                            var pc = this;\n                            var sender = origAddTrack.apply(pc, arguments);\n                            if (!sender) {\n                                sender = shimSenderWithDtmf(pc, track);\n                                pc._senders.push(sender);\n                            }\n                            return sender;\n                        };\n\n                        var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n                        window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n                            var pc = this;\n                            origRemoveTrack.apply(pc, arguments);\n                            var idx = pc._senders.indexOf(sender);\n                            if (idx !== -1) {\n                                pc._senders.splice(idx, 1);\n                            }\n                        };\n                    }\n                    var origAddStream = window.RTCPeerConnection.prototype.addStream;\n                    window.RTCPeerConnection.prototype.addStream = function(stream) {\n                        var pc = this;\n                        pc._senders = pc._senders || [];\n                        origAddStream.apply(pc, [stream]);\n                        stream.getTracks().forEach(function(track) {\n                            pc._senders.push(shimSenderWithDtmf(pc, track));\n                        });\n                    };\n\n                    var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n                    window.RTCPeerConnection.prototype.removeStream = function(stream) {\n                        var pc = this;\n                        pc._senders = pc._senders || [];\n                        origRemoveStream.apply(pc, [stream]);\n\n                        stream.getTracks().forEach(function(track) {\n                            var sender = pc._senders.find(function(s) {\n                                return s.track === track;\n                            });\n                            if (sender) {\n                                pc._senders.splice(pc._senders.indexOf(sender), 1); // remove sender\n                            }\n                        });\n                    };\n                } else if (typeof window === 'object' && window.RTCPeerConnection &&\n                    'getSenders' in window.RTCPeerConnection.prototype &&\n                    'createDTMFSender' in window.RTCPeerConnection.prototype &&\n                    window.RTCRtpSender &&\n                    !('dtmf' in window.RTCRtpSender.prototype)) {\n                    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n                    window.RTCPeerConnection.prototype.getSenders = function() {\n                        var pc = this;\n                        var senders = origGetSenders.apply(pc, []);\n                        senders.forEach(function(sender) {\n                            sender._pc = pc;\n                        });\n                        return senders;\n                    };\n\n                    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n                        get: function() {\n                            if (this._dtmf === undefined) {\n                                if (this.track.kind === 'audio') {\n                                    this._dtmf = this._pc.createDTMFSender(this.track);\n                                } else {\n                                    this._dtmf = null;\n                                }\n                            }\n                            return this._dtmf;\n                        }\n                    });\n                }\n            },\n\n            shimSenderReceiverGetStats: function(window) {\n                if (!(typeof window === 'object' && window.RTCPeerConnection &&\n                        window.RTCRtpSender && window.RTCRtpReceiver)) {\n                    return;\n                }\n\n                // shim sender stats.\n                if (!('getStats' in window.RTCRtpSender.prototype)) {\n                    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n                    if (origGetSenders) {\n                        window.RTCPeerConnection.prototype.getSenders = function() {\n                            var pc = this;\n                            var senders = origGetSenders.apply(pc, []);\n                            senders.forEach(function(sender) {\n                                sender._pc = pc;\n                            });\n                            return senders;\n                        };\n                    }\n\n                    var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n                    if (origAddTrack) {\n                        window.RTCPeerConnection.prototype.addTrack = function() {\n                            var sender = origAddTrack.apply(this, arguments);\n                            sender._pc = this;\n                            return sender;\n                        };\n                    }\n                    window.RTCRtpSender.prototype.getStats = function() {\n                        var sender = this;\n                        return this._pc.getStats().then(function(result) {\n                            /* Note: this will include stats of all senders that\n                             *   send a track with the same id as sender.track as\n                             *   it is not possible to identify the RTCRtpSender.\n                             */\n                            return filterStats(result, sender.track, true);\n                        });\n                    };\n                }\n\n                // shim receiver stats.\n                if (!('getStats' in window.RTCRtpReceiver.prototype)) {\n                    var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n                    if (origGetReceivers) {\n                        window.RTCPeerConnection.prototype.getReceivers = function() {\n                            var pc = this;\n                            var receivers = origGetReceivers.apply(pc, []);\n                            receivers.forEach(function(receiver) {\n                                receiver._pc = pc;\n                            });\n                            return receivers;\n                        };\n                    }\n                    utils.wrapPeerConnectionEvent(window, 'track', function(e) {\n                        e.receiver._pc = e.srcElement;\n                        return e;\n                    });\n                    window.RTCRtpReceiver.prototype.getStats = function() {\n                        var receiver = this;\n                        return this._pc.getStats().then(function(result) {\n                            return filterStats(result, receiver.track, false);\n                        });\n                    };\n                }\n\n                if (!('getStats' in window.RTCRtpSender.prototype &&\n                        'getStats' in window.RTCRtpReceiver.prototype)) {\n                    return;\n                }\n\n                // shim RTCPeerConnection.getStats(track).\n                var origGetStats = window.RTCPeerConnection.prototype.getStats;\n                window.RTCPeerConnection.prototype.getStats = function() {\n                    var pc = this;\n                    if (arguments.length > 0 &&\n                        arguments[0] instanceof window.MediaStreamTrack) {\n                        var track = arguments[0];\n                        var sender;\n                        var receiver;\n                        var err;\n                        pc.getSenders().forEach(function(s) {\n                            if (s.track === track) {\n                                if (sender) {\n                                    err = true;\n                                } else {\n                                    sender = s;\n                                }\n                            }\n                        });\n                        pc.getReceivers().forEach(function(r) {\n                            if (r.track === track) {\n                                if (receiver) {\n                                    err = true;\n                                } else {\n                                    receiver = r;\n                                }\n                            }\n                            return r.track === track;\n                        });\n                        if (err || (sender && receiver)) {\n                            return Promise.reject(new DOMException(\n                                'There are more than one sender or receiver for the track.',\n                                'InvalidAccessError'));\n                        } else if (sender) {\n                            return sender.getStats();\n                        } else if (receiver) {\n                            return receiver.getStats();\n                        }\n                        return Promise.reject(new DOMException(\n                            'There is no sender or receiver for the track.',\n                            'InvalidAccessError'));\n                    }\n                    return origGetStats.apply(pc, arguments);\n                };\n            },\n\n            shimSourceObject: function(window) {\n                var URL = window && window.URL;\n\n                if (typeof window === 'object') {\n                    if (window.HTMLMediaElement &&\n                        !('srcObject' in window.HTMLMediaElement.prototype)) {\n                        // Shim the srcObject property, once, when HTMLMediaElement is found.\n                        Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {\n                            get: function() {\n                                return this._srcObject;\n                            },\n                            set: function(stream) {\n                                var self = this;\n                                // Use _srcObject as a private property for this shim\n                                this._srcObject = stream;\n                                if (this.src) {\n                                    URL.revokeObjectURL(this.src);\n                                }\n\n                                if (!stream) {\n                                    this.src = '';\n                                    return undefined;\n                                }\n                                this.src = URL.createObjectURL(stream);\n                                // We need to recreate the blob url when a track is added or\n                                // removed. Doing it manually since we want to avoid a recursion.\n                                stream.addEventListener('addtrack', function() {\n                                    if (self.src) {\n                                        URL.revokeObjectURL(self.src);\n                                    }\n                                    self.src = URL.createObjectURL(stream);\n                                });\n                                stream.addEventListener('removetrack', function() {\n                                    if (self.src) {\n                                        URL.revokeObjectURL(self.src);\n                                    }\n                                    self.src = URL.createObjectURL(stream);\n                                });\n                            }\n                        });\n                    }\n                }\n            },\n\n            shimAddTrackRemoveTrackWithNative: function(window) {\n                // shim addTrack/removeTrack with native variants in order to make\n                // the interactions with legacy getLocalStreams behave as in other browsers.\n                // Keeps a mapping stream.id => [stream, rtpsenders...]\n                window.RTCPeerConnection.prototype.getLocalStreams = function() {\n                    var pc = this;\n                    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n                    return Object.keys(this._shimmedLocalStreams).map(function(streamId) {\n                        return pc._shimmedLocalStreams[streamId][0];\n                    });\n                };\n\n                var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n                window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n                    if (!stream) {\n                        return origAddTrack.apply(this, arguments);\n                    }\n                    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n                    var sender = origAddTrack.apply(this, arguments);\n                    if (!this._shimmedLocalStreams[stream.id]) {\n                        this._shimmedLocalStreams[stream.id] = [stream, sender];\n                    } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {\n                        this._shimmedLocalStreams[stream.id].push(sender);\n                    }\n                    return sender;\n                };\n\n                var origAddStream = window.RTCPeerConnection.prototype.addStream;\n                window.RTCPeerConnection.prototype.addStream = function(stream) {\n                    var pc = this;\n                    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n                    stream.getTracks().forEach(function(track) {\n                        var alreadyExists = pc.getSenders().find(function(s) {\n                            return s.track === track;\n                        });\n                        if (alreadyExists) {\n                            throw new DOMException('Track already exists.',\n                                'InvalidAccessError');\n                        }\n                    });\n                    var existingSenders = pc.getSenders();\n                    origAddStream.apply(this, arguments);\n                    var newSenders = pc.getSenders().filter(function(newSender) {\n                        return existingSenders.indexOf(newSender) === -1;\n                    });\n                    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);\n                };\n\n                var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n                window.RTCPeerConnection.prototype.removeStream = function(stream) {\n                    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n                    delete this._shimmedLocalStreams[stream.id];\n                    return origRemoveStream.apply(this, arguments);\n                };\n\n                var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n                window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n                    var pc = this;\n                    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n                    if (sender) {\n                        Object.keys(this._shimmedLocalStreams).forEach(function(streamId) {\n                            var idx = pc._shimmedLocalStreams[streamId].indexOf(sender);\n                            if (idx !== -1) {\n                                pc._shimmedLocalStreams[streamId].splice(idx, 1);\n                            }\n                            if (pc._shimmedLocalStreams[streamId].length === 1) {\n                                delete pc._shimmedLocalStreams[streamId];\n                            }\n                        });\n                    }\n                    return origRemoveTrack.apply(this, arguments);\n                };\n            },\n\n            shimAddTrackRemoveTrack: function(window) {\n                var browserDetails = utils.detectBrowser(window);\n                // shim addTrack and removeTrack.\n                if (window.RTCPeerConnection.prototype.addTrack &&\n                    browserDetails.version >= 65) {\n                    return this.shimAddTrackRemoveTrackWithNative(window);\n                }\n\n                // also shim pc.getLocalStreams when addTrack is shimmed\n                // to return the original streams.\n                var origGetLocalStreams = window.RTCPeerConnection.prototype\n                    .getLocalStreams;\n                window.RTCPeerConnection.prototype.getLocalStreams = function() {\n                    var pc = this;\n                    var nativeStreams = origGetLocalStreams.apply(this);\n                    pc._reverseStreams = pc._reverseStreams || {};\n                    return nativeStreams.map(function(stream) {\n                        return pc._reverseStreams[stream.id];\n                    });\n                };\n\n                var origAddStream = window.RTCPeerConnection.prototype.addStream;\n                window.RTCPeerConnection.prototype.addStream = function(stream) {\n                    var pc = this;\n                    pc._streams = pc._streams || {};\n                    pc._reverseStreams = pc._reverseStreams || {};\n\n                    stream.getTracks().forEach(function(track) {\n                        var alreadyExists = pc.getSenders().find(function(s) {\n                            return s.track === track;\n                        });\n                        if (alreadyExists) {\n                            throw new DOMException('Track already exists.',\n                                'InvalidAccessError');\n                        }\n                    });\n                    // Add identity mapping for consistency with addTrack.\n                    // Unless this is being used with a stream from addTrack.\n                    if (!pc._reverseStreams[stream.id]) {\n                        var newStream = new window.MediaStream(stream.getTracks());\n                        pc._streams[stream.id] = newStream;\n                        pc._reverseStreams[newStream.id] = stream;\n                        stream = newStream;\n                    }\n                    origAddStream.apply(pc, [stream]);\n                };\n\n                var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n                window.RTCPeerConnection.prototype.removeStream = function(stream) {\n                    var pc = this;\n                    pc._streams = pc._streams || {};\n                    pc._reverseStreams = pc._reverseStreams || {};\n\n                    origRemoveStream.apply(pc, [(pc._streams[stream.id] || stream)]);\n                    delete pc._reverseStreams[(pc._streams[stream.id] ?\n                        pc._streams[stream.id].id : stream.id)];\n                    delete pc._streams[stream.id];\n                };\n\n                window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n                    var pc = this;\n                    if (pc.signalingState === 'closed') {\n                        throw new DOMException(\n                            'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n                            'InvalidStateError');\n                    }\n                    var streams = [].slice.call(arguments, 1);\n                    if (streams.length !== 1 ||\n                        !streams[0].getTracks().find(function(t) {\n                            return t === track;\n                        })) {\n                        // this is not fully correct but all we can manage without\n                        // [[associated MediaStreams]] internal slot.\n                        throw new DOMException(\n                            'The adapter.js addTrack polyfill only supports a single ' +\n                            ' stream which is associated with the specified track.',\n                            'NotSupportedError');\n                    }\n\n                    var alreadyExists = pc.getSenders().find(function(s) {\n                        return s.track === track;\n                    });\n                    if (alreadyExists) {\n                        throw new DOMException('Track already exists.',\n                            'InvalidAccessError');\n                    }\n\n                    pc._streams = pc._streams || {};\n                    pc._reverseStreams = pc._reverseStreams || {};\n                    var oldStream = pc._streams[stream.id];\n                    if (oldStream) {\n                        // this is using odd Chrome behaviour, use with caution:\n                        // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815\n                        // Note: we rely on the high-level addTrack/dtmf shim to\n                        // create the sender with a dtmf sender.\n                        oldStream.addTrack(track);\n\n                        // Trigger ONN async.\n                        Promise.resolve().then(function() {\n                            pc.dispatchEvent(new Event('negotiationneeded'));\n                        });\n                    } else {\n                        var newStream = new window.MediaStream([track]);\n                        pc._streams[stream.id] = newStream;\n                        pc._reverseStreams[newStream.id] = stream;\n                        pc.addStream(newStream);\n                    }\n                    return pc.getSenders().find(function(s) {\n                        return s.track === track;\n                    });\n                };\n\n                // replace the internal stream id with the external one and\n                // vice versa.\n                function replaceInternalStreamId(pc, description) {\n                    var sdp = description.sdp;\n                    Object.keys(pc._reverseStreams || []).forEach(function(internalId) {\n                        var externalStream = pc._reverseStreams[internalId];\n                        var internalStream = pc._streams[externalStream.id];\n                        sdp = sdp.replace(new RegExp(internalStream.id, 'g'),\n                            externalStream.id);\n                    });\n                    return new RTCSessionDescription({\n                        type: description.type,\n                        sdp: sdp\n                    });\n                }\n                function replaceExternalStreamId(pc, description) {\n                    var sdp = description.sdp;\n                    Object.keys(pc._reverseStreams || []).forEach(function(internalId) {\n                        var externalStream = pc._reverseStreams[internalId];\n                        var internalStream = pc._streams[externalStream.id];\n                        sdp = sdp.replace(new RegExp(externalStream.id, 'g'),\n                            internalStream.id);\n                    });\n                    return new RTCSessionDescription({\n                        type: description.type,\n                        sdp: sdp\n                    });\n                }\n                ['createOffer', 'createAnswer'].forEach(function(method) {\n                    var nativeMethod = window.RTCPeerConnection.prototype[method];\n                    window.RTCPeerConnection.prototype[method] = function() {\n                        var pc = this;\n                        var args = arguments;\n                        var isLegacyCall = arguments.length &&\n                            typeof arguments[0] === 'function';\n                        if (isLegacyCall) {\n                            return nativeMethod.apply(pc, [\n                                function(description) {\n                                    var desc = replaceInternalStreamId(pc, description);\n                                    args[0].apply(null, [desc]);\n                                },\n                                function(err) {\n                                    if (args[1]) {\n                                        args[1].apply(null, err);\n                                    }\n                                }, arguments[2]\n                            ]);\n                        }\n                        return nativeMethod.apply(pc, arguments)\n                            .then(function(description) {\n                                return replaceInternalStreamId(pc, description);\n                            });\n                    };\n                });\n\n                var origSetLocalDescription =\n                    window.RTCPeerConnection.prototype.setLocalDescription;\n                window.RTCPeerConnection.prototype.setLocalDescription = function() {\n                    var pc = this;\n                    if (!arguments.length || !arguments[0].type) {\n                        return origSetLocalDescription.apply(pc, arguments);\n                    }\n                    arguments[0] = replaceExternalStreamId(pc, arguments[0]);\n                    return origSetLocalDescription.apply(pc, arguments);\n                };\n\n                // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier\n\n                var origLocalDescription = Object.getOwnPropertyDescriptor(\n                    window.RTCPeerConnection.prototype, 'localDescription');\n                Object.defineProperty(window.RTCPeerConnection.prototype,\n                    'localDescription', {\n                        get: function() {\n                            var pc = this;\n                            var description = origLocalDescription.get.apply(this);\n                            if (description.type === '') {\n                                return description;\n                            }\n                            return replaceInternalStreamId(pc, description);\n                        }\n                    });\n\n                window.RTCPeerConnection.prototype.removeTrack = function(sender) {\n                    var pc = this;\n                    if (pc.signalingState === 'closed') {\n                        throw new DOMException(\n                            'The RTCPeerConnection\\'s signalingState is \\'closed\\'.',\n                            'InvalidStateError');\n                    }\n                    // We can not yet check for sender instanceof RTCRtpSender\n                    // since we shim RTPSender. So we check if sender._pc is set.\n                    if (!sender._pc) {\n                        throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' +\n                            'does not implement interface RTCRtpSender.', 'TypeError');\n                    }\n                    var isLocal = sender._pc === pc;\n                    if (!isLocal) {\n                        throw new DOMException('Sender was not created by this connection.',\n                            'InvalidAccessError');\n                    }\n\n                    // Search for the native stream the senders track belongs to.\n                    pc._streams = pc._streams || {};\n                    var stream;\n                    Object.keys(pc._streams).forEach(function(streamid) {\n                        var hasTrack = pc._streams[streamid].getTracks().find(function(track) {\n                            return sender.track === track;\n                        });\n                        if (hasTrack) {\n                            stream = pc._streams[streamid];\n                        }\n                    });\n\n                    if (stream) {\n                        if (stream.getTracks().length === 1) {\n                            // if this is the last track of the stream, remove the stream. This\n                            // takes care of any shimmed _senders.\n                            pc.removeStream(pc._reverseStreams[stream.id]);\n                        } else {\n                            // relying on the same odd chrome behaviour as above.\n                            stream.removeTrack(sender.track);\n                        }\n                        pc.dispatchEvent(new Event('negotiationneeded'));\n                    }\n                };\n            },\n\n            shimPeerConnection: function(window) {\n                var browserDetails = utils.detectBrowser(window);\n\n                // The RTCPeerConnection object.\n                if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {\n                    window.RTCPeerConnection = function(pcConfig, pcConstraints) {\n                        // Translate iceTransportPolicy to iceTransports,\n                        // see https://code.google.com/p/webrtc/issues/detail?id=4869\n                        // this was fixed in M56 along with unprefixing RTCPeerConnection.\n                        logging('PeerConnection');\n                        if (pcConfig && pcConfig.iceTransportPolicy) {\n                            pcConfig.iceTransports = pcConfig.iceTransportPolicy;\n                        }\n\n                        return new window.webkitRTCPeerConnection(pcConfig, pcConstraints);\n                    };\n                    window.RTCPeerConnection.prototype =\n                        window.webkitRTCPeerConnection.prototype;\n                    // wrap static methods. Currently just generateCertificate.\n                    if (window.webkitRTCPeerConnection.generateCertificate) {\n                        Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n                            get: function() {\n                                return window.webkitRTCPeerConnection.generateCertificate;\n                            }\n                        });\n                    }\n                }\n\n                var origGetStats = window.RTCPeerConnection.prototype.getStats;\n                window.RTCPeerConnection.prototype.getStats = function(selector,\n                                                                       successCallback, errorCallback) {\n                    var pc = this;\n                    var args = arguments;\n\n                    // If selector is a function then we are in the old style stats so just\n                    // pass back the original getStats format to avoid breaking old users.\n                    if (arguments.length > 0 && typeof selector === 'function') {\n                        return origGetStats.apply(this, arguments);\n                    }\n\n                    // When spec-style getStats is supported, return those when called with\n                    // either no arguments or the selector argument is null.\n                    if (origGetStats.length === 0 && (arguments.length === 0 ||\n                            typeof arguments[0] !== 'function')) {\n                        return origGetStats.apply(this, []);\n                    }\n\n                    var fixChromeStats_ = function(response) {\n                        var standardReport = {};\n                        var reports = response.result();\n                        reports.forEach(function(report) {\n                            var standardStats = {\n                                id: report.id,\n                                timestamp: report.timestamp,\n                                type: {\n                                    localcandidate: 'local-candidate',\n                                    remotecandidate: 'remote-candidate'\n                                }[report.type] || report.type\n                            };\n                            report.names().forEach(function(name) {\n                                standardStats[name] = report.stat(name);\n                            });\n                            standardReport[standardStats.id] = standardStats;\n                        });\n\n                        return standardReport;\n                    };\n\n                    // shim getStats with maplike support\n                    var makeMapStats = function(stats) {\n                        return new Map(Object.keys(stats).map(function(key) {\n                            return [key, stats[key]];\n                        }));\n                    };\n\n                    if (arguments.length >= 2) {\n                        var successCallbackWrapper_ = function(response) {\n                            args[1](makeMapStats(fixChromeStats_(response)));\n                        };\n\n                        return origGetStats.apply(this, [successCallbackWrapper_,\n                            arguments[0]]);\n                    }\n\n                    // promise-support\n                    return new Promise(function(resolve, reject) {\n                        origGetStats.apply(pc, [\n                            function(response) {\n                                resolve(makeMapStats(fixChromeStats_(response)));\n                            }, reject]);\n                    }).then(successCallback, errorCallback);\n                };\n\n                // add promise support -- natively available in Chrome 51\n                if (browserDetails.version < 51) {\n                    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n                        .forEach(function(method) {\n                            var nativeMethod = window.RTCPeerConnection.prototype[method];\n                            window.RTCPeerConnection.prototype[method] = function() {\n                                var args = arguments;\n                                var pc = this;\n                                var promise = new Promise(function(resolve, reject) {\n                                    nativeMethod.apply(pc, [args[0], resolve, reject]);\n                                });\n                                if (args.length < 2) {\n                                    return promise;\n                                }\n                                return promise.then(function() {\n                                        args[1].apply(null, []);\n                                    },\n                                    function(err) {\n                                        if (args.length >= 3) {\n                                            args[2].apply(null, [err]);\n                                        }\n                                    });\n                            };\n                        });\n                }\n\n                // promise support for createOffer and createAnswer. Available (without\n                // bugs) since M52: crbug/619289\n                if (browserDetails.version < 52) {\n                    ['createOffer', 'createAnswer'].forEach(function(method) {\n                        var nativeMethod = window.RTCPeerConnection.prototype[method];\n                        window.RTCPeerConnection.prototype[method] = function() {\n                            var pc = this;\n                            if (arguments.length < 1 || (arguments.length === 1 &&\n                                    typeof arguments[0] === 'object')) {\n                                var opts = arguments.length === 1 ? arguments[0] : undefined;\n                                return new Promise(function(resolve, reject) {\n                                    nativeMethod.apply(pc, [resolve, reject, opts]);\n                                });\n                            }\n                            return nativeMethod.apply(this, arguments);\n                        };\n                    });\n                }\n\n                // shim implicit creation of RTCSessionDescription/RTCIceCandidate\n                ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n                    .forEach(function(method) {\n                        var nativeMethod = window.RTCPeerConnection.prototype[method];\n                        window.RTCPeerConnection.prototype[method] = function() {\n                            arguments[0] = new ((method === 'addIceCandidate') ?\n                                window.RTCIceCandidate :\n                                window.RTCSessionDescription)(arguments[0]);\n                            return nativeMethod.apply(this, arguments);\n                        };\n                    });\n\n                // support for addIceCandidate(null or undefined)\n                var nativeAddIceCandidate =\n                    window.RTCPeerConnection.prototype.addIceCandidate;\n                window.RTCPeerConnection.prototype.addIceCandidate = function() {\n                    if (!arguments[0]) {\n                        if (arguments[1]) {\n                            arguments[1].apply(null);\n                        }\n                        return Promise.resolve();\n                    }\n                    return nativeAddIceCandidate.apply(this, arguments);\n                };\n            },\n\n            fixNegotiationNeeded: function(window) {\n                utils.wrapPeerConnectionEvent(window, 'negotiationneeded', function(e) {\n                    var pc = e.target;\n                    if (pc.signalingState !== 'stable') {\n                        return;\n                    }\n                    return e;\n                });\n            },\n\n            shimGetDisplayMedia: function(window, getSourceId) {\n                if ('getDisplayMedia' in window.navigator) {\n                    return;\n                }\n                // getSourceId is a function that returns a promise resolving with\n                // the sourceId of the screen/window/tab to be shared.\n                if (typeof getSourceId !== 'function') {\n                    console.error('shimGetDisplayMedia: getSourceId argument is not ' +\n                        'a function');\n                    return;\n                }\n                navigator.getDisplayMedia = function(constraints) {\n                    return getSourceId(constraints)\n                        .then(function(sourceId) {\n                            constraints.video = {\n                                mandatory: {\n                                    chromeMediaSource: 'desktop',\n                                    chromeMediaSourceId: sourceId,\n                                    maxFrameRate: constraints.video.frameRate || 3\n                                }\n                            };\n                            return navigator.mediaDevices.getUserMedia(constraints);\n                        });\n                };\n            }\n        };\n\n    },{\"../utils.js\":14,\"./getusermedia\":6}],6:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n        'use strict';\n        var utils = require('../utils.js');\n        var logging = utils.log;\n\n        // Expose public methods.\n        module.exports = function(window) {\n            var browserDetails = utils.detectBrowser(window);\n            var navigator = window && window.navigator;\n\n            var constraintsToChrome_ = function(c) {\n                if (typeof c !== 'object' || c.mandatory || c.optional) {\n                    return c;\n                }\n                var cc = {};\n                Object.keys(c).forEach(function(key) {\n                    if (key === 'require' || key === 'advanced' || key === 'mediaSource') {\n                        return;\n                    }\n                    var r = (typeof c[key] === 'object') ? c[key] : {ideal: c[key]};\n                    if (r.exact !== undefined && typeof r.exact === 'number') {\n                        r.min = r.max = r.exact;\n                    }\n                    var oldname_ = function(prefix, name) {\n                        if (prefix) {\n                            return prefix + name.charAt(0).toUpperCase() + name.slice(1);\n                        }\n                        return (name === 'deviceId') ? 'sourceId' : name;\n                    };\n                    if (r.ideal !== undefined) {\n                        cc.optional = cc.optional || [];\n                        var oc = {};\n                        if (typeof r.ideal === 'number') {\n                            oc[oldname_('min', key)] = r.ideal;\n                            cc.optional.push(oc);\n                            oc = {};\n                            oc[oldname_('max', key)] = r.ideal;\n                            cc.optional.push(oc);\n                        } else {\n                            oc[oldname_('', key)] = r.ideal;\n                            cc.optional.push(oc);\n                        }\n                    }\n                    if (r.exact !== undefined && typeof r.exact !== 'number') {\n                        cc.mandatory = cc.mandatory || {};\n                        cc.mandatory[oldname_('', key)] = r.exact;\n                    } else {\n                        ['min', 'max'].forEach(function(mix) {\n                            if (r[mix] !== undefined) {\n                                cc.mandatory = cc.mandatory || {};\n                                cc.mandatory[oldname_(mix, key)] = r[mix];\n                            }\n                        });\n                    }\n                });\n                if (c.advanced) {\n                    cc.optional = (cc.optional || []).concat(c.advanced);\n                }\n                return cc;\n            };\n\n            var shimConstraints_ = function(constraints, func) {\n                if (browserDetails.version >= 61) {\n                    return func(constraints);\n                }\n                constraints = JSON.parse(JSON.stringify(constraints));\n                if (constraints && typeof constraints.audio === 'object') {\n                    var remap = function(obj, a, b) {\n                        if (a in obj && !(b in obj)) {\n                            obj[b] = obj[a];\n                            delete obj[a];\n                        }\n                    };\n                    constraints = JSON.parse(JSON.stringify(constraints));\n                    remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');\n                    remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');\n                    constraints.audio = constraintsToChrome_(constraints.audio);\n                }\n                if (constraints && typeof constraints.video === 'object') {\n                    // Shim facingMode for mobile & surface pro.\n                    var face = constraints.video.facingMode;\n                    face = face && ((typeof face === 'object') ? face : {ideal: face});\n                    var getSupportedFacingModeLies = browserDetails.version < 66;\n\n                    if ((face && (face.exact === 'user' || face.exact === 'environment' ||\n                            face.ideal === 'user' || face.ideal === 'environment')) &&\n                        !(navigator.mediaDevices.getSupportedConstraints &&\n                            navigator.mediaDevices.getSupportedConstraints().facingMode &&\n                            !getSupportedFacingModeLies)) {\n                        delete constraints.video.facingMode;\n                        var matches;\n                        if (face.exact === 'environment' || face.ideal === 'environment') {\n                            matches = ['back', 'rear'];\n                        } else if (face.exact === 'user' || face.ideal === 'user') {\n                            matches = ['front'];\n                        }\n                        if (matches) {\n                            // Look for matches in label, or use last cam for back (typical).\n                            return navigator.mediaDevices.enumerateDevices()\n                                .then(function(devices) {\n                                    devices = devices.filter(function(d) {\n                                        return d.kind === 'videoinput';\n                                    });\n                                    var dev = devices.find(function(d) {\n                                        return matches.some(function(match) {\n                                            return d.label.toLowerCase().indexOf(match) !== -1;\n                                        });\n                                    });\n                                    if (!dev && devices.length && matches.indexOf('back') !== -1) {\n                                        dev = devices[devices.length - 1]; // more likely the back cam\n                                    }\n                                    if (dev) {\n                                        constraints.video.deviceId = face.exact ? {exact: dev.deviceId} :\n                                            {ideal: dev.deviceId};\n                                    }\n                                    constraints.video = constraintsToChrome_(constraints.video);\n                                    logging('chrome: ' + JSON.stringify(constraints));\n                                    return func(constraints);\n                                });\n                        }\n                    }\n                    constraints.video = constraintsToChrome_(constraints.video);\n                }\n                logging('chrome: ' + JSON.stringify(constraints));\n                return func(constraints);\n            };\n\n            var shimError_ = function(e) {\n                if (browserDetails.version >= 64) {\n                    return e;\n                }\n                return {\n                    name: {\n                        PermissionDeniedError: 'NotAllowedError',\n                        PermissionDismissedError: 'NotAllowedError',\n                        InvalidStateError: 'NotAllowedError',\n                        DevicesNotFoundError: 'NotFoundError',\n                        ConstraintNotSatisfiedError: 'OverconstrainedError',\n                        TrackStartError: 'NotReadableError',\n                        MediaDeviceFailedDueToShutdown: 'NotAllowedError',\n                        MediaDeviceKillSwitchOn: 'NotAllowedError',\n                        TabCaptureError: 'AbortError',\n                        ScreenCaptureError: 'AbortError',\n                        DeviceCaptureError: 'AbortError'\n                    }[e.name] || e.name,\n                    message: e.message,\n                    constraint: e.constraint || e.constraintName,\n                    toString: function() {\n                        return this.name + (this.message && ': ') + this.message;\n                    }\n                };\n            };\n\n            var getUserMedia_ = function(constraints, onSuccess, onError) {\n                shimConstraints_(constraints, function(c) {\n                    navigator.webkitGetUserMedia(c, onSuccess, function(e) {\n                        if (onError) {\n                            onError(shimError_(e));\n                        }\n                    });\n                });\n            };\n\n            navigator.getUserMedia = getUserMedia_;\n\n            // Returns the result of getUserMedia as a Promise.\n            var getUserMediaPromise_ = function(constraints) {\n                return new Promise(function(resolve, reject) {\n                    navigator.getUserMedia(constraints, resolve, reject);\n                });\n            };\n\n            if (!navigator.mediaDevices) {\n                navigator.mediaDevices = {\n                    getUserMedia: getUserMediaPromise_,\n                    enumerateDevices: function() {\n                        return new Promise(function(resolve) {\n                            var kinds = {audio: 'audioinput', video: 'videoinput'};\n                            return window.MediaStreamTrack.getSources(function(devices) {\n                                resolve(devices.map(function(device) {\n                                    return {label: device.label,\n                                        kind: kinds[device.kind],\n                                        deviceId: device.id,\n                                        groupId: ''};\n                                }));\n                            });\n                        });\n                    },\n                    getSupportedConstraints: function() {\n                        return {\n                            deviceId: true, echoCancellation: true, facingMode: true,\n                            frameRate: true, height: true, width: true\n                        };\n                    }\n                };\n            }\n\n            // A shim for getUserMedia method on the mediaDevices object.\n            // TODO(KaptenJansson) remove once implemented in Chrome stable.\n            if (!navigator.mediaDevices.getUserMedia) {\n                navigator.mediaDevices.getUserMedia = function(constraints) {\n                    return getUserMediaPromise_(constraints);\n                };\n            } else {\n                // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia\n                // function which returns a Promise, it does not accept spec-style\n                // constraints.\n                var origGetUserMedia = navigator.mediaDevices.getUserMedia.\n                bind(navigator.mediaDevices);\n                navigator.mediaDevices.getUserMedia = function(cs) {\n                    return shimConstraints_(cs, function(c) {\n                        return origGetUserMedia(c).then(function(stream) {\n                            if (c.audio && !stream.getAudioTracks().length ||\n                                c.video && !stream.getVideoTracks().length) {\n                                stream.getTracks().forEach(function(track) {\n                                    track.stop();\n                                });\n                                throw new DOMException('', 'NotFoundError');\n                            }\n                            return stream;\n                        }, function(e) {\n                            return Promise.reject(shimError_(e));\n                        });\n                    });\n                };\n            }\n\n            // Dummy devicechange event methods.\n            // TODO(KaptenJansson) remove once implemented in Chrome stable.\n            if (typeof navigator.mediaDevices.addEventListener === 'undefined') {\n                navigator.mediaDevices.addEventListener = function() {\n                    logging('Dummy mediaDevices.addEventListener called.');\n                };\n            }\n            if (typeof navigator.mediaDevices.removeEventListener === 'undefined') {\n                navigator.mediaDevices.removeEventListener = function() {\n                    logging('Dummy mediaDevices.removeEventListener called.');\n                };\n            }\n        };\n\n    },{\"../utils.js\":14}],7:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n        'use strict';\n\n        var SDPUtils = require('sdp');\n        var utils = require('./utils');\n\n        module.exports = {\n            shimRTCIceCandidate: function(window) {\n                // foundation is arbitrarily chosen as an indicator for full support for\n                // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface\n                if (!window.RTCIceCandidate || (window.RTCIceCandidate && 'foundation' in\n                        window.RTCIceCandidate.prototype)) {\n                    return;\n                }\n\n                var NativeRTCIceCandidate = window.RTCIceCandidate;\n                window.RTCIceCandidate = function(args) {\n                    // Remove the a= which shouldn't be part of the candidate string.\n                    if (typeof args === 'object' && args.candidate &&\n                        args.candidate.indexOf('a=') === 0) {\n                        args = JSON.parse(JSON.stringify(args));\n                        args.candidate = args.candidate.substr(2);\n                    }\n\n                    if (args.candidate && args.candidate.length) {\n                        // Augment the native candidate with the parsed fields.\n                        var nativeCandidate = new NativeRTCIceCandidate(args);\n                        var parsedCandidate = SDPUtils.parseCandidate(args.candidate);\n                        var augmentedCandidate = Object.assign(nativeCandidate,\n                            parsedCandidate);\n\n                        // Add a serializer that does not serialize the extra attributes.\n                        augmentedCandidate.toJSON = function() {\n                            return {\n                                candidate: augmentedCandidate.candidate,\n                                sdpMid: augmentedCandidate.sdpMid,\n                                sdpMLineIndex: augmentedCandidate.sdpMLineIndex,\n                                usernameFragment: augmentedCandidate.usernameFragment,\n                            };\n                        };\n                        return augmentedCandidate;\n                    }\n                    return new NativeRTCIceCandidate(args);\n                };\n                window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype;\n\n                // Hook up the augmented candidate in onicecandidate and\n                // addEventListener('icecandidate', ...)\n                utils.wrapPeerConnectionEvent(window, 'icecandidate', function(e) {\n                    if (e.candidate) {\n                        Object.defineProperty(e, 'candidate', {\n                            value: new window.RTCIceCandidate(e.candidate),\n                            writable: 'false'\n                        });\n                    }\n                    return e;\n                });\n            },\n\n            // shimCreateObjectURL must be called before shimSourceObject to avoid loop.\n\n            shimCreateObjectURL: function(window) {\n                var URL = window && window.URL;\n\n                if (!(typeof window === 'object' && window.HTMLMediaElement &&\n                        'srcObject' in window.HTMLMediaElement.prototype &&\n                        URL.createObjectURL && URL.revokeObjectURL)) {\n                    // Only shim CreateObjectURL using srcObject if srcObject exists.\n                    return undefined;\n                }\n\n                var nativeCreateObjectURL = URL.createObjectURL.bind(URL);\n                var nativeRevokeObjectURL = URL.revokeObjectURL.bind(URL);\n                var streams = new Map(), newId = 0;\n\n                URL.createObjectURL = function(stream) {\n                    if ('getTracks' in stream) {\n                        var url = 'polyblob:' + (++newId);\n                        streams.set(url, stream);\n                        utils.deprecated('URL.createObjectURL(stream)',\n                            'elem.srcObject = stream');\n                        return url;\n                    }\n                    return nativeCreateObjectURL(stream);\n                };\n                URL.revokeObjectURL = function(url) {\n                    nativeRevokeObjectURL(url);\n                    streams.delete(url);\n                };\n\n                var dsc = Object.getOwnPropertyDescriptor(window.HTMLMediaElement.prototype,\n                    'src');\n                Object.defineProperty(window.HTMLMediaElement.prototype, 'src', {\n                    get: function() {\n                        return dsc.get.apply(this);\n                    },\n                    set: function(url) {\n                        this.srcObject = streams.get(url) || null;\n                        return dsc.set.apply(this, [url]);\n                    }\n                });\n\n                var nativeSetAttribute = window.HTMLMediaElement.prototype.setAttribute;\n                window.HTMLMediaElement.prototype.setAttribute = function() {\n                    if (arguments.length === 2 &&\n                        ('' + arguments[0]).toLowerCase() === 'src') {\n                        this.srcObject = streams.get(arguments[1]) || null;\n                    }\n                    return nativeSetAttribute.apply(this, arguments);\n                };\n            },\n\n            shimMaxMessageSize: function(window) {\n                if (window.RTCSctpTransport || !window.RTCPeerConnection) {\n                    return;\n                }\n                var browserDetails = utils.detectBrowser(window);\n\n                if (!('sctp' in window.RTCPeerConnection.prototype)) {\n                    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {\n                        get: function() {\n                            return typeof this._sctp === 'undefined' ? null : this._sctp;\n                        }\n                    });\n                }\n\n                var sctpInDescription = function(description) {\n                    var sections = SDPUtils.splitSections(description.sdp);\n                    sections.shift();\n                    return sections.some(function(mediaSection) {\n                        var mLine = SDPUtils.parseMLine(mediaSection);\n                        return mLine && mLine.kind === 'application'\n                            && mLine.protocol.indexOf('SCTP') !== -1;\n                    });\n                };\n\n                var getRemoteFirefoxVersion = function(description) {\n                    // TODO: Is there a better solution for detecting Firefox?\n                    var match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\\d+)/);\n                    if (match === null || match.length < 2) {\n                        return -1;\n                    }\n                    var version = parseInt(match[1], 10);\n                    // Test for NaN (yes, this is ugly)\n                    return version !== version ? -1 : version;\n                };\n\n                var getCanSendMaxMessageSize = function(remoteIsFirefox) {\n                    // Every implementation we know can send at least 64 KiB.\n                    // Note: Although Chrome is technically able to send up to 256 KiB, the\n                    //       data does not reach the other peer reliably.\n                    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419\n                    var canSendMaxMessageSize = 65536;\n                    if (browserDetails.browser === 'firefox') {\n                        if (browserDetails.version < 57) {\n                            if (remoteIsFirefox === -1) {\n                                // FF < 57 will send in 16 KiB chunks using the deprecated PPID\n                                // fragmentation.\n                                canSendMaxMessageSize = 16384;\n                            } else {\n                                // However, other FF (and RAWRTC) can reassemble PPID-fragmented\n                                // messages. Thus, supporting ~2 GiB when sending.\n                                canSendMaxMessageSize = 2147483637;\n                            }\n                        } else if (browserDetails.version < 60) {\n                            // Currently, all FF >= 57 will reset the remote maximum message size\n                            // to the default value when a data channel is created at a later\n                            // stage. :(\n                            // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n                            canSendMaxMessageSize =\n                                browserDetails.version === 57 ? 65535 : 65536;\n                        } else {\n                            // FF >= 60 supports sending ~2 GiB\n                            canSendMaxMessageSize = 2147483637;\n                        }\n                    }\n                    return canSendMaxMessageSize;\n                };\n\n                var getMaxMessageSize = function(description, remoteIsFirefox) {\n                    // Note: 65536 bytes is the default value from the SDP spec. Also,\n                    //       every implementation we know supports receiving 65536 bytes.\n                    var maxMessageSize = 65536;\n\n                    // FF 57 has a slightly incorrect default remote max message size, so\n                    // we need to adjust it here to avoid a failure when sending.\n                    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697\n                    if (browserDetails.browser === 'firefox'\n                        && browserDetails.version === 57) {\n                        maxMessageSize = 65535;\n                    }\n\n                    var match = SDPUtils.matchPrefix(description.sdp, 'a=max-message-size:');\n                    if (match.length > 0) {\n                        maxMessageSize = parseInt(match[0].substr(19), 10);\n                    } else if (browserDetails.browser === 'firefox' &&\n                        remoteIsFirefox !== -1) {\n                        // If the maximum message size is not present in the remote SDP and\n                        // both local and remote are Firefox, the remote peer can receive\n                        // ~2 GiB.\n                        maxMessageSize = 2147483637;\n                    }\n                    return maxMessageSize;\n                };\n\n                var origSetRemoteDescription =\n                    window.RTCPeerConnection.prototype.setRemoteDescription;\n                window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n                    var pc = this;\n                    pc._sctp = null;\n\n                    if (sctpInDescription(arguments[0])) {\n                        // Check if the remote is FF.\n                        var isFirefox = getRemoteFirefoxVersion(arguments[0]);\n\n                        // Get the maximum message size the local peer is capable of sending\n                        var canSendMMS = getCanSendMaxMessageSize(isFirefox);\n\n                        // Get the maximum message size of the remote peer.\n                        var remoteMMS = getMaxMessageSize(arguments[0], isFirefox);\n\n                        // Determine final maximum message size\n                        var maxMessageSize;\n                        if (canSendMMS === 0 && remoteMMS === 0) {\n                            maxMessageSize = Number.POSITIVE_INFINITY;\n                        } else if (canSendMMS === 0 || remoteMMS === 0) {\n                            maxMessageSize = Math.max(canSendMMS, remoteMMS);\n                        } else {\n                            maxMessageSize = Math.min(canSendMMS, remoteMMS);\n                        }\n\n                        // Create a dummy RTCSctpTransport object and the 'maxMessageSize'\n                        // attribute.\n                        var sctp = {};\n                        Object.defineProperty(sctp, 'maxMessageSize', {\n                            get: function() {\n                                return maxMessageSize;\n                            }\n                        });\n                        pc._sctp = sctp;\n                    }\n\n                    return origSetRemoteDescription.apply(pc, arguments);\n                };\n            },\n\n            shimSendThrowTypeError: function(window) {\n                if (!(window.RTCPeerConnection &&\n                        'createDataChannel' in window.RTCPeerConnection.prototype)) {\n                    return;\n                }\n\n                // Note: Although Firefox >= 57 has a native implementation, the maximum\n                //       message size can be reset for all data channels at a later stage.\n                //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n\n                function wrapDcSend(dc, pc) {\n                    var origDataChannelSend = dc.send;\n                    dc.send = function() {\n                        var data = arguments[0];\n                        var length = data.length || data.size || data.byteLength;\n                        if (dc.readyState === 'open' &&\n                            pc.sctp && length > pc.sctp.maxMessageSize) {\n                            throw new TypeError('Message too large (can send a maximum of ' +\n                                pc.sctp.maxMessageSize + ' bytes)');\n                        }\n                        return origDataChannelSend.apply(dc, arguments);\n                    };\n                }\n                var origCreateDataChannel =\n                    window.RTCPeerConnection.prototype.createDataChannel;\n                window.RTCPeerConnection.prototype.createDataChannel = function() {\n                    var pc = this;\n                    var dataChannel = origCreateDataChannel.apply(pc, arguments);\n                    wrapDcSend(dataChannel, pc);\n                    return dataChannel;\n                };\n                utils.wrapPeerConnectionEvent(window, 'datachannel', function(e) {\n                    wrapDcSend(e.channel, e.target);\n                    return e;\n                });\n            }\n        };\n\n    },{\"./utils\":14,\"sdp\":2}],8:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n        'use strict';\n\n        var utils = require('../utils');\n        var filterIceServers = require('./filtericeservers');\n        var shimRTCPeerConnection = require('rtcpeerconnection-shim');\n\n        module.exports = {\n            shimGetUserMedia: require('./getusermedia'),\n            shimPeerConnection: function(window) {\n                var browserDetails = utils.detectBrowser(window);\n\n                if (window.RTCIceGatherer) {\n                    if (!window.RTCIceCandidate) {\n                        window.RTCIceCandidate = function(args) {\n                            return args;\n                        };\n                    }\n                    if (!window.RTCSessionDescription) {\n                        window.RTCSessionDescription = function(args) {\n                            return args;\n                        };\n                    }\n                    // this adds an additional event listener to MediaStrackTrack that signals\n                    // when a tracks enabled property was changed. Workaround for a bug in\n                    // addStream, see below. No longer required in 15025+\n                    if (browserDetails.version < 15025) {\n                        var origMSTEnabled = Object.getOwnPropertyDescriptor(\n                            window.MediaStreamTrack.prototype, 'enabled');\n                        Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {\n                            set: function(value) {\n                                origMSTEnabled.set.call(this, value);\n                                var ev = new Event('enabled');\n                                ev.enabled = value;\n                                this.dispatchEvent(ev);\n                            }\n                        });\n                    }\n                }\n\n                // ORTC defines the DTMF sender a bit different.\n                // https://github.com/w3c/ortc/issues/714\n                if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {\n                    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n                        get: function() {\n                            if (this._dtmf === undefined) {\n                                if (this.track.kind === 'audio') {\n                                    this._dtmf = new window.RTCDtmfSender(this);\n                                } else if (this.track.kind === 'video') {\n                                    this._dtmf = null;\n                                }\n                            }\n                            return this._dtmf;\n                        }\n                    });\n                }\n                // Edge currently only implements the RTCDtmfSender, not the\n                // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*\n                if (window.RTCDtmfSender && !window.RTCDTMFSender) {\n                    window.RTCDTMFSender = window.RTCDtmfSender;\n                }\n\n                var RTCPeerConnectionShim = shimRTCPeerConnection(window,\n                    browserDetails.version);\n                window.RTCPeerConnection = function(config) {\n                    if (config && config.iceServers) {\n                        config.iceServers = filterIceServers(config.iceServers);\n                    }\n                    return new RTCPeerConnectionShim(config);\n                };\n                window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;\n            },\n            shimReplaceTrack: function(window) {\n                // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614\n                if (window.RTCRtpSender &&\n                    !('replaceTrack' in window.RTCRtpSender.prototype)) {\n                    window.RTCRtpSender.prototype.replaceTrack =\n                        window.RTCRtpSender.prototype.setTrack;\n                }\n            }\n        };\n\n    },{\"../utils\":14,\"./filtericeservers\":9,\"./getusermedia\":10,\"rtcpeerconnection-shim\":1}],9:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n        'use strict';\n\n        var utils = require('../utils');\n        // Edge does not like\n        // 1) stun: filtered after 14393 unless ?transport=udp is present\n        // 2) turn: that does not have all of turn:host:port?transport=udp\n        // 3) turn: with ipv6 addresses\n        // 4) turn: occurring muliple times\n        module.exports = function(iceServers, edgeVersion) {\n            var hasTurn = false;\n            iceServers = JSON.parse(JSON.stringify(iceServers));\n            return iceServers.filter(function(server) {\n                if (server && (server.urls || server.url)) {\n                    var urls = server.urls || server.url;\n                    if (server.url && !server.urls) {\n                        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n                    }\n                    var isString = typeof urls === 'string';\n                    if (isString) {\n                        urls = [urls];\n                    }\n                    urls = urls.filter(function(url) {\n                        var validTurn = url.indexOf('turn:') === 0 &&\n                            url.indexOf('transport=udp') !== -1 &&\n                            url.indexOf('turn:[') === -1 &&\n                            !hasTurn;\n\n                        if (validTurn) {\n                            hasTurn = true;\n                            return true;\n                        }\n                        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&\n                            url.indexOf('?transport=udp') === -1;\n                    });\n\n                    delete server.url;\n                    server.urls = isString ? urls[0] : urls;\n                    return !!urls.length;\n                }\n            });\n        };\n\n    },{\"../utils\":14}],10:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n        'use strict';\n\n        // Expose public methods.\n        module.exports = function(window) {\n            var navigator = window && window.navigator;\n\n            var shimError_ = function(e) {\n                return {\n                    name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,\n                    message: e.message,\n                    constraint: e.constraint,\n                    toString: function() {\n                        return this.name;\n                    }\n                };\n            };\n\n            // getUserMedia error shim.\n            var origGetUserMedia = navigator.mediaDevices.getUserMedia.\n            bind(navigator.mediaDevices);\n            navigator.mediaDevices.getUserMedia = function(c) {\n                return origGetUserMedia(c).catch(function(e) {\n                    return Promise.reject(shimError_(e));\n                });\n            };\n        };\n\n    },{}],11:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n        'use strict';\n\n        var utils = require('../utils');\n\n        module.exports = {\n            shimGetUserMedia: require('./getusermedia'),\n            shimOnTrack: function(window) {\n                if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in\n                        window.RTCPeerConnection.prototype)) {\n                    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {\n                        get: function() {\n                            return this._ontrack;\n                        },\n                        set: function(f) {\n                            if (this._ontrack) {\n                                this.removeEventListener('track', this._ontrack);\n                                this.removeEventListener('addstream', this._ontrackpoly);\n                            }\n                            this.addEventListener('track', this._ontrack = f);\n                            this.addEventListener('addstream', this._ontrackpoly = function(e) {\n                                e.stream.getTracks().forEach(function(track) {\n                                    var event = new Event('track');\n                                    event.track = track;\n                                    event.receiver = {track: track};\n                                    event.transceiver = {receiver: event.receiver};\n                                    event.streams = [e.stream];\n                                    this.dispatchEvent(event);\n                                }.bind(this));\n                            }.bind(this));\n                        },\n                        enumerable: true,\n                        configurable: true\n                    });\n                }\n                if (typeof window === 'object' && window.RTCTrackEvent &&\n                    ('receiver' in window.RTCTrackEvent.prototype) &&\n                    !('transceiver' in window.RTCTrackEvent.prototype)) {\n                    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n                        get: function() {\n                            return {receiver: this.receiver};\n                        }\n                    });\n                }\n            },\n\n            shimSourceObject: function(window) {\n                // Firefox has supported mozSrcObject since FF22, unprefixed in 42.\n                if (typeof window === 'object') {\n                    if (window.HTMLMediaElement &&\n                        !('srcObject' in window.HTMLMediaElement.prototype)) {\n                        // Shim the srcObject property, once, when HTMLMediaElement is found.\n                        Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {\n                            get: function() {\n                                return this.mozSrcObject;\n                            },\n                            set: function(stream) {\n                                this.mozSrcObject = stream;\n                            }\n                        });\n                    }\n                }\n            },\n\n            shimPeerConnection: function(window) {\n                var browserDetails = utils.detectBrowser(window);\n\n                if (typeof window !== 'object' || !(window.RTCPeerConnection ||\n                        window.mozRTCPeerConnection)) {\n                    return; // probably media.peerconnection.enabled=false in about:config\n                }\n                // The RTCPeerConnection object.\n                if (!window.RTCPeerConnection) {\n                    window.RTCPeerConnection = function(pcConfig, pcConstraints) {\n                        if (browserDetails.version < 38) {\n                            // .urls is not supported in FF < 38.\n                            // create RTCIceServers with a single url.\n                            if (pcConfig && pcConfig.iceServers) {\n                                var newIceServers = [];\n                                for (var i = 0; i < pcConfig.iceServers.length; i++) {\n                                    var server = pcConfig.iceServers[i];\n                                    if (server.hasOwnProperty('urls')) {\n                                        for (var j = 0; j < server.urls.length; j++) {\n                                            var newServer = {\n                                                url: server.urls[j]\n                                            };\n                                            if (server.urls[j].indexOf('turn') === 0) {\n                                                newServer.username = server.username;\n                                                newServer.credential = server.credential;\n                                            }\n                                            newIceServers.push(newServer);\n                                        }\n                                    } else {\n                                        newIceServers.push(pcConfig.iceServers[i]);\n                                    }\n                                }\n                                pcConfig.iceServers = newIceServers;\n                            }\n                        }\n                        return new window.mozRTCPeerConnection(pcConfig, pcConstraints);\n                    };\n                    window.RTCPeerConnection.prototype =\n                        window.mozRTCPeerConnection.prototype;\n\n                    // wrap static methods. Currently just generateCertificate.\n                    if (window.mozRTCPeerConnection.generateCertificate) {\n                        Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n                            get: function() {\n                                return window.mozRTCPeerConnection.generateCertificate;\n                            }\n                        });\n                    }\n\n                    window.RTCSessionDescription = window.mozRTCSessionDescription;\n                    window.RTCIceCandidate = window.mozRTCIceCandidate;\n                }\n\n                // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.\n                ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']\n                    .forEach(function(method) {\n                        var nativeMethod = window.RTCPeerConnection.prototype[method];\n                        window.RTCPeerConnection.prototype[method] = function() {\n                            arguments[0] = new ((method === 'addIceCandidate') ?\n                                window.RTCIceCandidate :\n                                window.RTCSessionDescription)(arguments[0]);\n                            return nativeMethod.apply(this, arguments);\n                        };\n                    });\n\n                // support for addIceCandidate(null or undefined)\n                var nativeAddIceCandidate =\n                    window.RTCPeerConnection.prototype.addIceCandidate;\n                window.RTCPeerConnection.prototype.addIceCandidate = function() {\n                    if (!arguments[0]) {\n                        if (arguments[1]) {\n                            arguments[1].apply(null);\n                        }\n                        return Promise.resolve();\n                    }\n                    return nativeAddIceCandidate.apply(this, arguments);\n                };\n\n                // shim getStats with maplike support\n                var makeMapStats = function(stats) {\n                    var map = new Map();\n                    Object.keys(stats).forEach(function(key) {\n                        map.set(key, stats[key]);\n                        map[key] = stats[key];\n                    });\n                    return map;\n                };\n\n                var modernStatsTypes = {\n                    inboundrtp: 'inbound-rtp',\n                    outboundrtp: 'outbound-rtp',\n                    candidatepair: 'candidate-pair',\n                    localcandidate: 'local-candidate',\n                    remotecandidate: 'remote-candidate'\n                };\n\n                var nativeGetStats = window.RTCPeerConnection.prototype.getStats;\n                window.RTCPeerConnection.prototype.getStats = function(\n                    selector,\n                    onSucc,\n                    onErr\n                ) {\n                    return nativeGetStats.apply(this, [selector || null])\n                        .then(function(stats) {\n                            if (browserDetails.version < 48) {\n                                stats = makeMapStats(stats);\n                            }\n                            if (browserDetails.version < 53 && !onSucc) {\n                                // Shim only promise getStats with spec-hyphens in type names\n                                // Leave callback version alone; misc old uses of forEach before Map\n                                try {\n                                    stats.forEach(function(stat) {\n                                        stat.type = modernStatsTypes[stat.type] || stat.type;\n                                    });\n                                } catch (e) {\n                                    if (e.name !== 'TypeError') {\n                                        throw e;\n                                    }\n                                    // Avoid TypeError: \"type\" is read-only, in old versions. 34-43ish\n                                    stats.forEach(function(stat, i) {\n                                        stats.set(i, Object.assign({}, stat, {\n                                            type: modernStatsTypes[stat.type] || stat.type\n                                        }));\n                                    });\n                                }\n                            }\n                            return stats;\n                        })\n                        .then(onSucc, onErr);\n                };\n            },\n\n            shimSenderGetStats: function(window) {\n                if (!(typeof window === 'object' && window.RTCPeerConnection &&\n                        window.RTCRtpSender)) {\n                    return;\n                }\n                if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {\n                    return;\n                }\n                var origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n                if (origGetSenders) {\n                    window.RTCPeerConnection.prototype.getSenders = function() {\n                        var pc = this;\n                        var senders = origGetSenders.apply(pc, []);\n                        senders.forEach(function(sender) {\n                            sender._pc = pc;\n                        });\n                        return senders;\n                    };\n                }\n\n                var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n                if (origAddTrack) {\n                    window.RTCPeerConnection.prototype.addTrack = function() {\n                        var sender = origAddTrack.apply(this, arguments);\n                        sender._pc = this;\n                        return sender;\n                    };\n                }\n                window.RTCRtpSender.prototype.getStats = function() {\n                    return this.track ? this._pc.getStats(this.track) :\n                        Promise.resolve(new Map());\n                };\n            },\n\n            shimReceiverGetStats: function(window) {\n                if (!(typeof window === 'object' && window.RTCPeerConnection &&\n                        window.RTCRtpSender)) {\n                    return;\n                }\n                if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {\n                    return;\n                }\n                var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n                if (origGetReceivers) {\n                    window.RTCPeerConnection.prototype.getReceivers = function() {\n                        var pc = this;\n                        var receivers = origGetReceivers.apply(pc, []);\n                        receivers.forEach(function(receiver) {\n                            receiver._pc = pc;\n                        });\n                        return receivers;\n                    };\n                }\n                utils.wrapPeerConnectionEvent(window, 'track', function(e) {\n                    e.receiver._pc = e.srcElement;\n                    return e;\n                });\n                window.RTCRtpReceiver.prototype.getStats = function() {\n                    return this._pc.getStats(this.track);\n                };\n            },\n\n            shimRemoveStream: function(window) {\n                if (!window.RTCPeerConnection ||\n                    'removeStream' in window.RTCPeerConnection.prototype) {\n                    return;\n                }\n                window.RTCPeerConnection.prototype.removeStream = function(stream) {\n                    var pc = this;\n                    utils.deprecated('removeStream', 'removeTrack');\n                    this.getSenders().forEach(function(sender) {\n                        if (sender.track && stream.getTracks().indexOf(sender.track) !== -1) {\n                            pc.removeTrack(sender);\n                        }\n                    });\n                };\n            },\n\n            shimRTCDataChannel: function(window) {\n                // rename DataChannel to RTCDataChannel (native fix in FF60):\n                // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851\n                if (window.DataChannel && !window.RTCDataChannel) {\n                    window.RTCDataChannel = window.DataChannel;\n                }\n            },\n\n            shimGetDisplayMedia: function(window, preferredMediaSource) {\n                if ('getDisplayMedia' in window.navigator) {\n                    return;\n                }\n                navigator.getDisplayMedia = function(constraints) {\n                    if (!(constraints && constraints.video)) {\n                        var err = new DOMException('getDisplayMedia without video ' +\n                            'constraints is undefined');\n                        err.name = 'NotFoundError';\n                        // from https://heycam.github.io/webidl/#idl-DOMException-error-names\n                        err.code = 8;\n                        return Promise.reject(err);\n                    }\n                    if (constraints.video === true) {\n                        constraints.video = {mediaSource: preferredMediaSource};\n                    } else {\n                        constraints.video.mediaSource = preferredMediaSource;\n                    }\n                    return navigator.mediaDevices.getUserMedia(constraints);\n                };\n            }\n        };\n\n    },{\"../utils\":14,\"./getusermedia\":12}],12:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n        'use strict';\n\n        var utils = require('../utils');\n        var logging = utils.log;\n\n        // Expose public methods.\n        module.exports = function(window) {\n            var browserDetails = utils.detectBrowser(window);\n            var navigator = window && window.navigator;\n            var MediaStreamTrack = window && window.MediaStreamTrack;\n\n            var shimError_ = function(e) {\n                return {\n                    name: {\n                        InternalError: 'NotReadableError',\n                        NotSupportedError: 'TypeError',\n                        PermissionDeniedError: 'NotAllowedError',\n                        SecurityError: 'NotAllowedError'\n                    }[e.name] || e.name,\n                    message: {\n                        'The operation is insecure.': 'The request is not allowed by the ' +\n                        'user agent or the platform in the current context.'\n                    }[e.message] || e.message,\n                    constraint: e.constraint,\n                    toString: function() {\n                        return this.name + (this.message && ': ') + this.message;\n                    }\n                };\n            };\n\n            // getUserMedia constraints shim.\n            var getUserMedia_ = function(constraints, onSuccess, onError) {\n                var constraintsToFF37_ = function(c) {\n                    if (typeof c !== 'object' || c.require) {\n                        return c;\n                    }\n                    var require = [];\n                    Object.keys(c).forEach(function(key) {\n                        if (key === 'require' || key === 'advanced' || key === 'mediaSource') {\n                            return;\n                        }\n                        var r = c[key] = (typeof c[key] === 'object') ?\n                            c[key] : {ideal: c[key]};\n                        if (r.min !== undefined ||\n                            r.max !== undefined || r.exact !== undefined) {\n                            require.push(key);\n                        }\n                        if (r.exact !== undefined) {\n                            if (typeof r.exact === 'number') {\n                                r. min = r.max = r.exact;\n                            } else {\n                                c[key] = r.exact;\n                            }\n                            delete r.exact;\n                        }\n                        if (r.ideal !== undefined) {\n                            c.advanced = c.advanced || [];\n                            var oc = {};\n                            if (typeof r.ideal === 'number') {\n                                oc[key] = {min: r.ideal, max: r.ideal};\n                            } else {\n                                oc[key] = r.ideal;\n                            }\n                            c.advanced.push(oc);\n                            delete r.ideal;\n                            if (!Object.keys(r).length) {\n                                delete c[key];\n                            }\n                        }\n                    });\n                    if (require.length) {\n                        c.require = require;\n                    }\n                    return c;\n                };\n                constraints = JSON.parse(JSON.stringify(constraints));\n                if (browserDetails.version < 38) {\n                    logging('spec: ' + JSON.stringify(constraints));\n                    if (constraints.audio) {\n                        constraints.audio = constraintsToFF37_(constraints.audio);\n                    }\n                    if (constraints.video) {\n                        constraints.video = constraintsToFF37_(constraints.video);\n                    }\n                    logging('ff37: ' + JSON.stringify(constraints));\n                }\n                return navigator.mozGetUserMedia(constraints, onSuccess, function(e) {\n                    onError(shimError_(e));\n                });\n            };\n\n            // Returns the result of getUserMedia as a Promise.\n            var getUserMediaPromise_ = function(constraints) {\n                return new Promise(function(resolve, reject) {\n                    getUserMedia_(constraints, resolve, reject);\n                });\n            };\n\n            // Shim for mediaDevices on older versions.\n            if (!navigator.mediaDevices) {\n                navigator.mediaDevices = {getUserMedia: getUserMediaPromise_,\n                    addEventListener: function() { },\n                    removeEventListener: function() { }\n                };\n            }\n            navigator.mediaDevices.enumerateDevices =\n                navigator.mediaDevices.enumerateDevices || function() {\n                    return new Promise(function(resolve) {\n                        var infos = [\n                            {kind: 'audioinput', deviceId: 'default', label: '', groupId: ''},\n                            {kind: 'videoinput', deviceId: 'default', label: '', groupId: ''}\n                        ];\n                        resolve(infos);\n                    });\n                };\n\n            if (browserDetails.version < 41) {\n                // Work around http://bugzil.la/1169665\n                var orgEnumerateDevices =\n                    navigator.mediaDevices.enumerateDevices.bind(navigator.mediaDevices);\n                navigator.mediaDevices.enumerateDevices = function() {\n                    return orgEnumerateDevices().then(undefined, function(e) {\n                        if (e.name === 'NotFoundError') {\n                            return [];\n                        }\n                        throw e;\n                    });\n                };\n            }\n            if (browserDetails.version < 49) {\n                var origGetUserMedia = navigator.mediaDevices.getUserMedia.\n                bind(navigator.mediaDevices);\n                navigator.mediaDevices.getUserMedia = function(c) {\n                    return origGetUserMedia(c).then(function(stream) {\n                        // Work around https://bugzil.la/802326\n                        if (c.audio && !stream.getAudioTracks().length ||\n                            c.video && !stream.getVideoTracks().length) {\n                            stream.getTracks().forEach(function(track) {\n                                track.stop();\n                            });\n                            throw new DOMException('The object can not be found here.',\n                                'NotFoundError');\n                        }\n                        return stream;\n                    }, function(e) {\n                        return Promise.reject(shimError_(e));\n                    });\n                };\n            }\n            if (!(browserDetails.version > 55 &&\n                    'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {\n                var remap = function(obj, a, b) {\n                    if (a in obj && !(b in obj)) {\n                        obj[b] = obj[a];\n                        delete obj[a];\n                    }\n                };\n\n                var nativeGetUserMedia = navigator.mediaDevices.getUserMedia.\n                bind(navigator.mediaDevices);\n                navigator.mediaDevices.getUserMedia = function(c) {\n                    if (typeof c === 'object' && typeof c.audio === 'object') {\n                        c = JSON.parse(JSON.stringify(c));\n                        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');\n                        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');\n                    }\n                    return nativeGetUserMedia(c);\n                };\n\n                if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {\n                    var nativeGetSettings = MediaStreamTrack.prototype.getSettings;\n                    MediaStreamTrack.prototype.getSettings = function() {\n                        var obj = nativeGetSettings.apply(this, arguments);\n                        remap(obj, 'mozAutoGainControl', 'autoGainControl');\n                        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');\n                        return obj;\n                    };\n                }\n\n                if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {\n                    var nativeApplyConstraints = MediaStreamTrack.prototype.applyConstraints;\n                    MediaStreamTrack.prototype.applyConstraints = function(c) {\n                        if (this.kind === 'audio' && typeof c === 'object') {\n                            c = JSON.parse(JSON.stringify(c));\n                            remap(c, 'autoGainControl', 'mozAutoGainControl');\n                            remap(c, 'noiseSuppression', 'mozNoiseSuppression');\n                        }\n                        return nativeApplyConstraints.apply(this, [c]);\n                    };\n                }\n            }\n            navigator.getUserMedia = function(constraints, onSuccess, onError) {\n                if (browserDetails.version < 44) {\n                    return getUserMedia_(constraints, onSuccess, onError);\n                }\n                // Replace Firefox 44+'s deprecation warning with unprefixed version.\n                utils.deprecated('navigator.getUserMedia',\n                    'navigator.mediaDevices.getUserMedia');\n                navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);\n            };\n        };\n\n    },{\"../utils\":14}],13:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        'use strict';\n        var utils = require('../utils');\n\n        module.exports = {\n            shimLocalStreamsAPI: function(window) {\n                if (typeof window !== 'object' || !window.RTCPeerConnection) {\n                    return;\n                }\n                if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {\n                    window.RTCPeerConnection.prototype.getLocalStreams = function() {\n                        if (!this._localStreams) {\n                            this._localStreams = [];\n                        }\n                        return this._localStreams;\n                    };\n                }\n                if (!('getStreamById' in window.RTCPeerConnection.prototype)) {\n                    window.RTCPeerConnection.prototype.getStreamById = function(id) {\n                        var result = null;\n                        if (this._localStreams) {\n                            this._localStreams.forEach(function(stream) {\n                                if (stream.id === id) {\n                                    result = stream;\n                                }\n                            });\n                        }\n                        if (this._remoteStreams) {\n                            this._remoteStreams.forEach(function(stream) {\n                                if (stream.id === id) {\n                                    result = stream;\n                                }\n                            });\n                        }\n                        return result;\n                    };\n                }\n                if (!('addStream' in window.RTCPeerConnection.prototype)) {\n                    var _addTrack = window.RTCPeerConnection.prototype.addTrack;\n                    window.RTCPeerConnection.prototype.addStream = function(stream) {\n                        if (!this._localStreams) {\n                            this._localStreams = [];\n                        }\n                        if (this._localStreams.indexOf(stream) === -1) {\n                            this._localStreams.push(stream);\n                        }\n                        var pc = this;\n                        stream.getTracks().forEach(function(track) {\n                            _addTrack.call(pc, track, stream);\n                        });\n                    };\n\n                    window.RTCPeerConnection.prototype.addTrack = function(track, stream) {\n                        if (stream) {\n                            if (!this._localStreams) {\n                                this._localStreams = [stream];\n                            } else if (this._localStreams.indexOf(stream) === -1) {\n                                this._localStreams.push(stream);\n                            }\n                        }\n                        return _addTrack.call(this, track, stream);\n                    };\n                }\n                if (!('removeStream' in window.RTCPeerConnection.prototype)) {\n                    window.RTCPeerConnection.prototype.removeStream = function(stream) {\n                        if (!this._localStreams) {\n                            this._localStreams = [];\n                        }\n                        var index = this._localStreams.indexOf(stream);\n                        if (index === -1) {\n                            return;\n                        }\n                        this._localStreams.splice(index, 1);\n                        var pc = this;\n                        var tracks = stream.getTracks();\n                        this.getSenders().forEach(function(sender) {\n                            if (tracks.indexOf(sender.track) !== -1) {\n                                pc.removeTrack(sender);\n                            }\n                        });\n                    };\n                }\n            },\n            shimRemoteStreamsAPI: function(window) {\n                if (typeof window !== 'object' || !window.RTCPeerConnection) {\n                    return;\n                }\n                if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {\n                    window.RTCPeerConnection.prototype.getRemoteStreams = function() {\n                        return this._remoteStreams ? this._remoteStreams : [];\n                    };\n                }\n                if (!('onaddstream' in window.RTCPeerConnection.prototype)) {\n                    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {\n                        get: function() {\n                            return this._onaddstream;\n                        },\n                        set: function(f) {\n                            if (this._onaddstream) {\n                                this.removeEventListener('addstream', this._onaddstream);\n                            }\n                            this.addEventListener('addstream', this._onaddstream = f);\n                        }\n                    });\n                    var origSetRemoteDescription =\n                        window.RTCPeerConnection.prototype.setRemoteDescription;\n                    window.RTCPeerConnection.prototype.setRemoteDescription = function() {\n                        var pc = this;\n                        if (!this._onaddstreampoly) {\n                            this.addEventListener('track', this._onaddstreampoly = function(e) {\n                                e.streams.forEach(function(stream) {\n                                    if (!pc._remoteStreams) {\n                                        pc._remoteStreams = [];\n                                    }\n                                    if (pc._remoteStreams.indexOf(stream) >= 0) {\n                                        return;\n                                    }\n                                    pc._remoteStreams.push(stream);\n                                    var event = new Event('addstream');\n                                    event.stream = stream;\n                                    pc.dispatchEvent(event);\n                                });\n                            });\n                        }\n                        return origSetRemoteDescription.apply(pc, arguments);\n                    };\n                }\n            },\n            shimCallbacksAPI: function(window) {\n                if (typeof window !== 'object' || !window.RTCPeerConnection) {\n                    return;\n                }\n                var prototype = window.RTCPeerConnection.prototype;\n                var createOffer = prototype.createOffer;\n                var createAnswer = prototype.createAnswer;\n                var setLocalDescription = prototype.setLocalDescription;\n                var setRemoteDescription = prototype.setRemoteDescription;\n                var addIceCandidate = prototype.addIceCandidate;\n\n                prototype.createOffer = function(successCallback, failureCallback) {\n                    var options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n                    var promise = createOffer.apply(this, [options]);\n                    if (!failureCallback) {\n                        return promise;\n                    }\n                    promise.then(successCallback, failureCallback);\n                    return Promise.resolve();\n                };\n\n                prototype.createAnswer = function(successCallback, failureCallback) {\n                    var options = (arguments.length >= 2) ? arguments[2] : arguments[0];\n                    var promise = createAnswer.apply(this, [options]);\n                    if (!failureCallback) {\n                        return promise;\n                    }\n                    promise.then(successCallback, failureCallback);\n                    return Promise.resolve();\n                };\n\n                var withCallback = function(description, successCallback, failureCallback) {\n                    var promise = setLocalDescription.apply(this, [description]);\n                    if (!failureCallback) {\n                        return promise;\n                    }\n                    promise.then(successCallback, failureCallback);\n                    return Promise.resolve();\n                };\n                prototype.setLocalDescription = withCallback;\n\n                withCallback = function(description, successCallback, failureCallback) {\n                    var promise = setRemoteDescription.apply(this, [description]);\n                    if (!failureCallback) {\n                        return promise;\n                    }\n                    promise.then(successCallback, failureCallback);\n                    return Promise.resolve();\n                };\n                prototype.setRemoteDescription = withCallback;\n\n                withCallback = function(candidate, successCallback, failureCallback) {\n                    var promise = addIceCandidate.apply(this, [candidate]);\n                    if (!failureCallback) {\n                        return promise;\n                    }\n                    promise.then(successCallback, failureCallback);\n                    return Promise.resolve();\n                };\n                prototype.addIceCandidate = withCallback;\n            },\n            shimGetUserMedia: function(window) {\n                var navigator = window && window.navigator;\n\n                if (!navigator.getUserMedia) {\n                    if (navigator.webkitGetUserMedia) {\n                        navigator.getUserMedia = navigator.webkitGetUserMedia.bind(navigator);\n                    } else if (navigator.mediaDevices &&\n                        navigator.mediaDevices.getUserMedia) {\n                        navigator.getUserMedia = function(constraints, cb, errcb) {\n                            navigator.mediaDevices.getUserMedia(constraints)\n                                .then(cb, errcb);\n                        }.bind(navigator);\n                    }\n                }\n            },\n            shimRTCIceServerUrls: function(window) {\n                // migrate from non-spec RTCIceServer.url to RTCIceServer.urls\n                var OrigPeerConnection = window.RTCPeerConnection;\n                window.RTCPeerConnection = function(pcConfig, pcConstraints) {\n                    if (pcConfig && pcConfig.iceServers) {\n                        var newIceServers = [];\n                        for (var i = 0; i < pcConfig.iceServers.length; i++) {\n                            var server = pcConfig.iceServers[i];\n                            if (!server.hasOwnProperty('urls') &&\n                                server.hasOwnProperty('url')) {\n                                utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n                                server = JSON.parse(JSON.stringify(server));\n                                server.urls = server.url;\n                                delete server.url;\n                                newIceServers.push(server);\n                            } else {\n                                newIceServers.push(pcConfig.iceServers[i]);\n                            }\n                        }\n                        pcConfig.iceServers = newIceServers;\n                    }\n                    return new OrigPeerConnection(pcConfig, pcConstraints);\n                };\n                window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;\n                // wrap static methods. Currently just generateCertificate.\n                if ('generateCertificate' in window.RTCPeerConnection) {\n                    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n                        get: function() {\n                            return OrigPeerConnection.generateCertificate;\n                        }\n                    });\n                }\n            },\n            shimTrackEventTransceiver: function(window) {\n                // Add event.transceiver member over deprecated event.receiver\n                if (typeof window === 'object' && window.RTCPeerConnection &&\n                    ('receiver' in window.RTCTrackEvent.prototype) &&\n                    // can't check 'transceiver' in window.RTCTrackEvent.prototype, as it is\n                    // defined for some reason even when window.RTCTransceiver is not.\n                    !window.RTCTransceiver) {\n                    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n                        get: function() {\n                            return {receiver: this.receiver};\n                        }\n                    });\n                }\n            },\n\n            shimCreateOfferLegacy: function(window) {\n                var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n                window.RTCPeerConnection.prototype.createOffer = function(offerOptions) {\n                    var pc = this;\n                    if (offerOptions) {\n                        if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {\n                            // support bit values\n                            offerOptions.offerToReceiveAudio = !!offerOptions.offerToReceiveAudio;\n                        }\n                        var audioTransceiver = pc.getTransceivers().find(function(transceiver) {\n                            return transceiver.sender.track &&\n                                transceiver.sender.track.kind === 'audio';\n                        });\n                        if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {\n                            if (audioTransceiver.direction === 'sendrecv') {\n                                if (audioTransceiver.setDirection) {\n                                    audioTransceiver.setDirection('sendonly');\n                                } else {\n                                    audioTransceiver.direction = 'sendonly';\n                                }\n                            } else if (audioTransceiver.direction === 'recvonly') {\n                                if (audioTransceiver.setDirection) {\n                                    audioTransceiver.setDirection('inactive');\n                                } else {\n                                    audioTransceiver.direction = 'inactive';\n                                }\n                            }\n                        } else if (offerOptions.offerToReceiveAudio === true &&\n                            !audioTransceiver) {\n                            pc.addTransceiver('audio');\n                        }\n\n\n                        if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {\n                            // support bit values\n                            offerOptions.offerToReceiveVideo = !!offerOptions.offerToReceiveVideo;\n                        }\n                        var videoTransceiver = pc.getTransceivers().find(function(transceiver) {\n                            return transceiver.sender.track &&\n                                transceiver.sender.track.kind === 'video';\n                        });\n                        if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {\n                            if (videoTransceiver.direction === 'sendrecv') {\n                                videoTransceiver.setDirection('sendonly');\n                            } else if (videoTransceiver.direction === 'recvonly') {\n                                videoTransceiver.setDirection('inactive');\n                            }\n                        } else if (offerOptions.offerToReceiveVideo === true &&\n                            !videoTransceiver) {\n                            pc.addTransceiver('video');\n                        }\n                    }\n                    return origCreateOffer.apply(pc, arguments);\n                };\n            }\n        };\n\n    },{\"../utils\":14}],14:[function(require,module,exports){\n        /*\n         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n         *\n         *  Use of this source code is governed by a BSD-style license\n         *  that can be found in the LICENSE file in the root of the source\n         *  tree.\n         */\n        /* eslint-env node */\n        'use strict';\n\n        var logDisabled_ = true;\n        var deprecationWarnings_ = true;\n\n        /**\n         * Extract browser version out of the provided user agent string.\n         *\n         * @param {!string} uastring userAgent string.\n         * @param {!string} expr Regular expression used as match criteria.\n         * @param {!number} pos position in the version string to be returned.\n         * @return {!number} browser version.\n         */\n        function extractVersion(uastring, expr, pos) {\n            var match = uastring.match(expr);\n            return match && match.length >= pos && parseInt(match[pos], 10);\n        }\n\n        // Wraps the peerconnection event eventNameToWrap in a function\n        // which returns the modified event object (or false to prevent\n        // the event).\n        function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {\n            if (!window.RTCPeerConnection) {\n                return;\n            }\n            var proto = window.RTCPeerConnection.prototype;\n            var nativeAddEventListener = proto.addEventListener;\n            proto.addEventListener = function(nativeEventName, cb) {\n                if (nativeEventName !== eventNameToWrap) {\n                    return nativeAddEventListener.apply(this, arguments);\n                }\n                var wrappedCallback = function(e) {\n                    var modifiedEvent = wrapper(e);\n                    if (modifiedEvent) {\n                        cb(modifiedEvent);\n                    }\n                };\n                this._eventMap = this._eventMap || {};\n                this._eventMap[cb] = wrappedCallback;\n                return nativeAddEventListener.apply(this, [nativeEventName,\n                    wrappedCallback]);\n            };\n\n            var nativeRemoveEventListener = proto.removeEventListener;\n            proto.removeEventListener = function(nativeEventName, cb) {\n                if (nativeEventName !== eventNameToWrap || !this._eventMap\n                    || !this._eventMap[cb]) {\n                    return nativeRemoveEventListener.apply(this, arguments);\n                }\n                var unwrappedCb = this._eventMap[cb];\n                delete this._eventMap[cb];\n                return nativeRemoveEventListener.apply(this, [nativeEventName,\n                    unwrappedCb]);\n            };\n\n            Object.defineProperty(proto, 'on' + eventNameToWrap, {\n                get: function() {\n                    return this['_on' + eventNameToWrap];\n                },\n                set: function(cb) {\n                    if (this['_on' + eventNameToWrap]) {\n                        this.removeEventListener(eventNameToWrap,\n                            this['_on' + eventNameToWrap]);\n                        delete this['_on' + eventNameToWrap];\n                    }\n                    if (cb) {\n                        this.addEventListener(eventNameToWrap,\n                            this['_on' + eventNameToWrap] = cb);\n                    }\n                },\n                enumerable: true,\n                configurable: true\n            });\n        }\n\n        // Utility methods.\n        module.exports = {\n            extractVersion: extractVersion,\n            wrapPeerConnectionEvent: wrapPeerConnectionEvent,\n            disableLog: function(bool) {\n                if (typeof bool !== 'boolean') {\n                    return new Error('Argument type: ' + typeof bool +\n                        '. Please use a boolean.');\n                }\n                logDisabled_ = bool;\n                return (bool) ? 'adapter.js logging disabled' :\n                    'adapter.js logging enabled';\n            },\n\n            /**\n             * Disable or enable deprecation warnings\n             * @param {!boolean} bool set to true to disable warnings.\n             */\n            disableWarnings: function(bool) {\n                if (typeof bool !== 'boolean') {\n                    return new Error('Argument type: ' + typeof bool +\n                        '. Please use a boolean.');\n                }\n                deprecationWarnings_ = !bool;\n                return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');\n            },\n\n            log: function() {\n                if (typeof window === 'object') {\n                    if (logDisabled_) {\n                        return;\n                    }\n                    if (typeof console !== 'undefined' && typeof console.log === 'function') {\n                        console.log.apply(console, arguments);\n                    }\n                }\n            },\n\n            /**\n             * Shows a deprecation warning suggesting the modern and spec-compatible API.\n             */\n            deprecated: function(oldMethod, newMethod) {\n                if (!deprecationWarnings_) {\n                    return;\n                }\n                console.warn(oldMethod + ' is deprecated, please use ' + newMethod +\n                    ' instead.');\n            },\n\n            /**\n             * Browser detector.\n             *\n             * @return {object} result containing browser and version\n             *     properties.\n             */\n            detectBrowser: function(window) {\n                var navigator = window && window.navigator;\n\n                // Returned result object.\n                var result = {};\n                result.browser = null;\n                result.version = null;\n\n                // Fail early if it's not a browser\n                if (typeof window === 'undefined' || !window.navigator) {\n                    result.browser = 'Not a browser.';\n                    return result;\n                }\n\n                if (navigator.mozGetUserMedia) { // Firefox.\n                    result.browser = 'firefox';\n                    result.version = extractVersion(navigator.userAgent,\n                        /Firefox\\/(\\d+)\\./, 1);\n                } else if (navigator.webkitGetUserMedia) {\n                    // Chrome, Chromium, Webview, Opera.\n                    // Version matches Chrome/WebRTC version.\n                    result.browser = 'chrome';\n                    result.version = extractVersion(navigator.userAgent,\n                        /Chrom(e|ium)\\/(\\d+)\\./, 2);\n                } else if (navigator.mediaDevices &&\n                    navigator.userAgent.match(/Edge\\/(\\d+).(\\d+)$/)) { // Edge.\n                    result.browser = 'edge';\n                    result.version = extractVersion(navigator.userAgent,\n                        /Edge\\/(\\d+).(\\d+)$/, 2);\n                } else if (window.RTCPeerConnection &&\n                    navigator.userAgent.match(/AppleWebKit\\/(\\d+)\\./)) { // Safari.\n                    result.browser = 'safari';\n                    result.version = extractVersion(navigator.userAgent,\n                        /AppleWebKit\\/(\\d+)\\./, 1);\n                } else { // Default fallthrough: not supported.\n                    result.browser = 'Not a supported browser.';\n                    return result;\n                }\n\n                return result;\n            }\n        };\n\n    },{}]},{},[3])(3)\n});\n\n"],"file":"adapter.min.js"}
\ No newline at end of file
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* Description of import/upgrade into Moodle:\n *\n * 1. Visit https://github.com/webrtc/adapter/releases.\n * 2. Check if the version has been updated from what is listed in lib/thirdpartylibs.xml in the Moodle wwwroot.\n * 3. If it has -\n *    1. Download the source code.\n *    2. Copy the content of the file release/adapter.js from the archive (ignore the first line).\n *    3. Replace the content below \"return (function e(t,n,r) ..\" in this file with the content you copied.\n *    4. Ensure to update lib/thirdpartylibs.xml with any changes.\n */\n\n// ESLint directives.\n/* eslint-disable */\n\n// JSHint directives.\n/* jshint ignore:start */\n\ndefine([], function() {\nreturn (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n\n'use strict';\n\nvar _adapter_factory = require('./adapter_factory.js');\n\nvar adapter = (0, _adapter_factory.adapterFactory)({ window: window });\nmodule.exports = adapter; // this is the difference from adapter_core.\n\n},{\"./adapter_factory.js\":2}],2:[function(require,module,exports){\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\nexports.adapterFactory = adapterFactory;\n\nvar _utils = require('./utils');\n\nvar utils = _interopRequireWildcard(_utils);\n\nvar _chrome_shim = require('./chrome/chrome_shim');\n\nvar chromeShim = _interopRequireWildcard(_chrome_shim);\n\nvar _edge_shim = require('./edge/edge_shim');\n\nvar edgeShim = _interopRequireWildcard(_edge_shim);\n\nvar _firefox_shim = require('./firefox/firefox_shim');\n\nvar firefoxShim = _interopRequireWildcard(_firefox_shim);\n\nvar _safari_shim = require('./safari/safari_shim');\n\nvar safariShim = _interopRequireWildcard(_safari_shim);\n\nvar _common_shim = require('./common_shim');\n\nvar commonShim = _interopRequireWildcard(_common_shim);\n\nfunction _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }\n\n// Shimming starts here.\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\nfunction adapterFactory() {\n  var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},\n      window = _ref.window;\n\n  var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {\n    shimChrome: true,\n    shimFirefox: true,\n    shimEdge: true,\n    shimSafari: true\n  };\n\n  // Utils.\n  var logging = utils.log;\n  var browserDetails = utils.detectBrowser(window);\n\n  var adapter = {\n    browserDetails: browserDetails,\n    commonShim: commonShim,\n    extractVersion: utils.extractVersion,\n    disableLog: utils.disableLog,\n    disableWarnings: utils.disableWarnings\n  };\n\n  // Shim browser if found.\n  switch (browserDetails.browser) {\n    case 'chrome':\n      if (!chromeShim || !chromeShim.shimPeerConnection || !options.shimChrome) {\n        logging('Chrome shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming chrome.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = chromeShim;\n\n      chromeShim.shimGetUserMedia(window);\n      chromeShim.shimMediaStream(window);\n      chromeShim.shimPeerConnection(window);\n      chromeShim.shimOnTrack(window);\n      chromeShim.shimAddTrackRemoveTrack(window);\n      chromeShim.shimGetSendersWithDtmf(window);\n      chromeShim.shimGetStats(window);\n      chromeShim.shimSenderReceiverGetStats(window);\n      chromeShim.fixNegotiationNeeded(window);\n\n      commonShim.shimRTCIceCandidate(window);\n      commonShim.shimConnectionState(window);\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      commonShim.removeAllowExtmapMixed(window);\n      break;\n    case 'firefox':\n      if (!firefoxShim || !firefoxShim.shimPeerConnection || !options.shimFirefox) {\n        logging('Firefox shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming firefox.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = firefoxShim;\n\n      firefoxShim.shimGetUserMedia(window);\n      firefoxShim.shimPeerConnection(window);\n      firefoxShim.shimOnTrack(window);\n      firefoxShim.shimRemoveStream(window);\n      firefoxShim.shimSenderGetStats(window);\n      firefoxShim.shimReceiverGetStats(window);\n      firefoxShim.shimRTCDataChannel(window);\n      firefoxShim.shimAddTransceiver(window);\n      firefoxShim.shimCreateOffer(window);\n      firefoxShim.shimCreateAnswer(window);\n\n      commonShim.shimRTCIceCandidate(window);\n      commonShim.shimConnectionState(window);\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      break;\n    case 'edge':\n      if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {\n        logging('MS edge shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming edge.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = edgeShim;\n\n      edgeShim.shimGetUserMedia(window);\n      edgeShim.shimGetDisplayMedia(window);\n      edgeShim.shimPeerConnection(window);\n      edgeShim.shimReplaceTrack(window);\n\n      // the edge shim implements the full RTCIceCandidate object.\n\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      break;\n    case 'safari':\n      if (!safariShim || !options.shimSafari) {\n        logging('Safari shim is not included in this adapter release.');\n        return adapter;\n      }\n      logging('adapter.js shimming safari.');\n      // Export to the adapter global object visible in the browser.\n      adapter.browserShim = safariShim;\n\n      safariShim.shimRTCIceServerUrls(window);\n      safariShim.shimCreateOfferLegacy(window);\n      safariShim.shimCallbacksAPI(window);\n      safariShim.shimLocalStreamsAPI(window);\n      safariShim.shimRemoteStreamsAPI(window);\n      safariShim.shimTrackEventTransceiver(window);\n      safariShim.shimGetUserMedia(window);\n\n      commonShim.shimRTCIceCandidate(window);\n      commonShim.shimMaxMessageSize(window);\n      commonShim.shimSendThrowTypeError(window);\n      commonShim.removeAllowExtmapMixed(window);\n      break;\n    default:\n      logging('Unsupported browser!');\n      break;\n  }\n\n  return adapter;\n}\n\n// Browser shims.\n\n},{\"./chrome/chrome_shim\":3,\"./common_shim\":6,\"./edge/edge_shim\":7,\"./firefox/firefox_shim\":11,\"./safari/safari_shim\":14,\"./utils\":15}],3:[function(require,module,exports){\n\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\nexports.shimGetDisplayMedia = exports.shimGetUserMedia = undefined;\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nvar _getusermedia = require('./getusermedia');\n\nObject.defineProperty(exports, 'shimGetUserMedia', {\n  enumerable: true,\n  get: function get() {\n    return _getusermedia.shimGetUserMedia;\n  }\n});\n\nvar _getdisplaymedia = require('./getdisplaymedia');\n\nObject.defineProperty(exports, 'shimGetDisplayMedia', {\n  enumerable: true,\n  get: function get() {\n    return _getdisplaymedia.shimGetDisplayMedia;\n  }\n});\nexports.shimMediaStream = shimMediaStream;\nexports.shimOnTrack = shimOnTrack;\nexports.shimGetSendersWithDtmf = shimGetSendersWithDtmf;\nexports.shimGetStats = shimGetStats;\nexports.shimSenderReceiverGetStats = shimSenderReceiverGetStats;\nexports.shimAddTrackRemoveTrackWithNative = shimAddTrackRemoveTrackWithNative;\nexports.shimAddTrackRemoveTrack = shimAddTrackRemoveTrack;\nexports.shimPeerConnection = shimPeerConnection;\nexports.fixNegotiationNeeded = fixNegotiationNeeded;\n\nvar _utils = require('../utils.js');\n\nvar utils = _interopRequireWildcard(_utils);\n\nfunction _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nfunction shimMediaStream(window) {\n  window.MediaStream = window.MediaStream || window.webkitMediaStream;\n}\n\nfunction shimOnTrack(window) {\n  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && !('ontrack' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {\n      get: function get() {\n        return this._ontrack;\n      },\n      set: function set(f) {\n        if (this._ontrack) {\n          this.removeEventListener('track', this._ontrack);\n        }\n        this.addEventListener('track', this._ontrack = f);\n      },\n\n      enumerable: true,\n      configurable: true\n    });\n    var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {\n      var _this = this;\n\n      if (!this._ontrackpoly) {\n        this._ontrackpoly = function (e) {\n          // onaddstream does not fire when a track is added to an existing\n          // stream. But stream.onaddtrack is implemented so we use that.\n          e.stream.addEventListener('addtrack', function (te) {\n            var receiver = void 0;\n            if (window.RTCPeerConnection.prototype.getReceivers) {\n              receiver = _this.getReceivers().find(function (r) {\n                return r.track && r.track.id === te.track.id;\n              });\n            } else {\n              receiver = { track: te.track };\n            }\n\n            var event = new Event('track');\n            event.track = te.track;\n            event.receiver = receiver;\n            event.transceiver = { receiver: receiver };\n            event.streams = [e.stream];\n            _this.dispatchEvent(event);\n          });\n          e.stream.getTracks().forEach(function (track) {\n            var receiver = void 0;\n            if (window.RTCPeerConnection.prototype.getReceivers) {\n              receiver = _this.getReceivers().find(function (r) {\n                return r.track && r.track.id === track.id;\n              });\n            } else {\n              receiver = { track: track };\n            }\n            var event = new Event('track');\n            event.track = track;\n            event.receiver = receiver;\n            event.transceiver = { receiver: receiver };\n            event.streams = [e.stream];\n            _this.dispatchEvent(event);\n          });\n        };\n        this.addEventListener('addstream', this._ontrackpoly);\n      }\n      return origSetRemoteDescription.apply(this, arguments);\n    };\n  } else {\n    // even if RTCRtpTransceiver is in window, it is only used and\n    // emitted in unified-plan. Unfortunately this means we need\n    // to unconditionally wrap the event.\n    utils.wrapPeerConnectionEvent(window, 'track', function (e) {\n      if (!e.transceiver) {\n        Object.defineProperty(e, 'transceiver', { value: { receiver: e.receiver } });\n      }\n      return e;\n    });\n  }\n}\n\nfunction shimGetSendersWithDtmf(window) {\n  // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.\n  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && !('getSenders' in window.RTCPeerConnection.prototype) && 'createDTMFSender' in window.RTCPeerConnection.prototype) {\n    var shimSenderWithDtmf = function shimSenderWithDtmf(pc, track) {\n      return {\n        track: track,\n        get dtmf() {\n          if (this._dtmf === undefined) {\n            if (track.kind === 'audio') {\n              this._dtmf = pc.createDTMFSender(track);\n            } else {\n              this._dtmf = null;\n            }\n          }\n          return this._dtmf;\n        },\n        _pc: pc\n      };\n    };\n\n    // augment addTrack when getSenders is not available.\n    if (!window.RTCPeerConnection.prototype.getSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n        this._senders = this._senders || [];\n        return this._senders.slice(); // return a copy of the internal state.\n      };\n      var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n      window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {\n        var sender = origAddTrack.apply(this, arguments);\n        if (!sender) {\n          sender = shimSenderWithDtmf(this, track);\n          this._senders.push(sender);\n        }\n        return sender;\n      };\n\n      var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n      window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {\n        origRemoveTrack.apply(this, arguments);\n        var idx = this._senders.indexOf(sender);\n        if (idx !== -1) {\n          this._senders.splice(idx, 1);\n        }\n      };\n    }\n    var origAddStream = window.RTCPeerConnection.prototype.addStream;\n    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n      var _this2 = this;\n\n      this._senders = this._senders || [];\n      origAddStream.apply(this, [stream]);\n      stream.getTracks().forEach(function (track) {\n        _this2._senders.push(shimSenderWithDtmf(_this2, track));\n      });\n    };\n\n    var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n    window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {\n      var _this3 = this;\n\n      this._senders = this._senders || [];\n      origRemoveStream.apply(this, [stream]);\n\n      stream.getTracks().forEach(function (track) {\n        var sender = _this3._senders.find(function (s) {\n          return s.track === track;\n        });\n        if (sender) {\n          // remove sender\n          _this3._senders.splice(_this3._senders.indexOf(sender), 1);\n        }\n      });\n    };\n  } else if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && 'getSenders' in window.RTCPeerConnection.prototype && 'createDTMFSender' in window.RTCPeerConnection.prototype && window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {\n    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n      var _this4 = this;\n\n      var senders = origGetSenders.apply(this, []);\n      senders.forEach(function (sender) {\n        return sender._pc = _this4;\n      });\n      return senders;\n    };\n\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get: function get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = this._pc.createDTMFSender(this.track);\n          } else {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n}\n\nfunction shimGetStats(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  var origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    var _this5 = this;\n\n    var _arguments = Array.prototype.slice.call(arguments),\n        selector = _arguments[0],\n        onSucc = _arguments[1],\n        onErr = _arguments[2];\n\n    // If selector is a function then we are in the old style stats so just\n    // pass back the original getStats format to avoid breaking old users.\n\n\n    if (arguments.length > 0 && typeof selector === 'function') {\n      return origGetStats.apply(this, arguments);\n    }\n\n    // When spec-style getStats is supported, return those when called with\n    // either no arguments or the selector argument is null.\n    if (origGetStats.length === 0 && (arguments.length === 0 || typeof selector !== 'function')) {\n      return origGetStats.apply(this, []);\n    }\n\n    var fixChromeStats_ = function fixChromeStats_(response) {\n      var standardReport = {};\n      var reports = response.result();\n      reports.forEach(function (report) {\n        var standardStats = {\n          id: report.id,\n          timestamp: report.timestamp,\n          type: {\n            localcandidate: 'local-candidate',\n            remotecandidate: 'remote-candidate'\n          }[report.type] || report.type\n        };\n        report.names().forEach(function (name) {\n          standardStats[name] = report.stat(name);\n        });\n        standardReport[standardStats.id] = standardStats;\n      });\n\n      return standardReport;\n    };\n\n    // shim getStats with maplike support\n    var makeMapStats = function makeMapStats(stats) {\n      return new Map(Object.keys(stats).map(function (key) {\n        return [key, stats[key]];\n      }));\n    };\n\n    if (arguments.length >= 2) {\n      var successCallbackWrapper_ = function successCallbackWrapper_(response) {\n        onSucc(makeMapStats(fixChromeStats_(response)));\n      };\n\n      return origGetStats.apply(this, [successCallbackWrapper_, selector]);\n    }\n\n    // promise-support\n    return new Promise(function (resolve, reject) {\n      origGetStats.apply(_this5, [function (response) {\n        resolve(makeMapStats(fixChromeStats_(response)));\n      }, reject]);\n    }).then(onSucc, onErr);\n  };\n}\n\nfunction shimSenderReceiverGetStats(window) {\n  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && window.RTCRtpSender && window.RTCRtpReceiver)) {\n    return;\n  }\n\n  // shim sender stats.\n  if (!('getStats' in window.RTCRtpSender.prototype)) {\n    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n    if (origGetSenders) {\n      window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n        var _this6 = this;\n\n        var senders = origGetSenders.apply(this, []);\n        senders.forEach(function (sender) {\n          return sender._pc = _this6;\n        });\n        return senders;\n      };\n    }\n\n    var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n    if (origAddTrack) {\n      window.RTCPeerConnection.prototype.addTrack = function addTrack() {\n        var sender = origAddTrack.apply(this, arguments);\n        sender._pc = this;\n        return sender;\n      };\n    }\n    window.RTCRtpSender.prototype.getStats = function getStats() {\n      var sender = this;\n      return this._pc.getStats().then(function (result) {\n        return (\n          /* Note: this will include stats of all senders that\n           *   send a track with the same id as sender.track as\n           *   it is not possible to identify the RTCRtpSender.\n           */\n          utils.filterStats(result, sender.track, true)\n        );\n      });\n    };\n  }\n\n  // shim receiver stats.\n  if (!('getStats' in window.RTCRtpReceiver.prototype)) {\n    var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n    if (origGetReceivers) {\n      window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {\n        var _this7 = this;\n\n        var receivers = origGetReceivers.apply(this, []);\n        receivers.forEach(function (receiver) {\n          return receiver._pc = _this7;\n        });\n        return receivers;\n      };\n    }\n    utils.wrapPeerConnectionEvent(window, 'track', function (e) {\n      e.receiver._pc = e.srcElement;\n      return e;\n    });\n    window.RTCRtpReceiver.prototype.getStats = function getStats() {\n      var receiver = this;\n      return this._pc.getStats().then(function (result) {\n        return utils.filterStats(result, receiver.track, false);\n      });\n    };\n  }\n\n  if (!('getStats' in window.RTCRtpSender.prototype && 'getStats' in window.RTCRtpReceiver.prototype)) {\n    return;\n  }\n\n  // shim RTCPeerConnection.getStats(track).\n  var origGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    if (arguments.length > 0 && arguments[0] instanceof window.MediaStreamTrack) {\n      var track = arguments[0];\n      var sender = void 0;\n      var receiver = void 0;\n      var err = void 0;\n      this.getSenders().forEach(function (s) {\n        if (s.track === track) {\n          if (sender) {\n            err = true;\n          } else {\n            sender = s;\n          }\n        }\n      });\n      this.getReceivers().forEach(function (r) {\n        if (r.track === track) {\n          if (receiver) {\n            err = true;\n          } else {\n            receiver = r;\n          }\n        }\n        return r.track === track;\n      });\n      if (err || sender && receiver) {\n        return Promise.reject(new DOMException('There are more than one sender or receiver for the track.', 'InvalidAccessError'));\n      } else if (sender) {\n        return sender.getStats();\n      } else if (receiver) {\n        return receiver.getStats();\n      }\n      return Promise.reject(new DOMException('There is no sender or receiver for the track.', 'InvalidAccessError'));\n    }\n    return origGetStats.apply(this, arguments);\n  };\n}\n\nfunction shimAddTrackRemoveTrackWithNative(window) {\n  // shim addTrack/removeTrack with native variants in order to make\n  // the interactions with legacy getLocalStreams behave as in other browsers.\n  // Keeps a mapping stream.id => [stream, rtpsenders...]\n  window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {\n    var _this8 = this;\n\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n    return Object.keys(this._shimmedLocalStreams).map(function (streamId) {\n      return _this8._shimmedLocalStreams[streamId][0];\n    });\n  };\n\n  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {\n    if (!stream) {\n      return origAddTrack.apply(this, arguments);\n    }\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n    var sender = origAddTrack.apply(this, arguments);\n    if (!this._shimmedLocalStreams[stream.id]) {\n      this._shimmedLocalStreams[stream.id] = [stream, sender];\n    } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {\n      this._shimmedLocalStreams[stream.id].push(sender);\n    }\n    return sender;\n  };\n\n  var origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n    var _this9 = this;\n\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n\n    stream.getTracks().forEach(function (track) {\n      var alreadyExists = _this9.getSenders().find(function (s) {\n        return s.track === track;\n      });\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.', 'InvalidAccessError');\n      }\n    });\n    var existingSenders = this.getSenders();\n    origAddStream.apply(this, arguments);\n    var newSenders = this.getSenders().filter(function (newSender) {\n      return existingSenders.indexOf(newSender) === -1;\n    });\n    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);\n  };\n\n  var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n    delete this._shimmedLocalStreams[stream.id];\n    return origRemoveStream.apply(this, arguments);\n  };\n\n  var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;\n  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {\n    var _this10 = this;\n\n    this._shimmedLocalStreams = this._shimmedLocalStreams || {};\n    if (sender) {\n      Object.keys(this._shimmedLocalStreams).forEach(function (streamId) {\n        var idx = _this10._shimmedLocalStreams[streamId].indexOf(sender);\n        if (idx !== -1) {\n          _this10._shimmedLocalStreams[streamId].splice(idx, 1);\n        }\n        if (_this10._shimmedLocalStreams[streamId].length === 1) {\n          delete _this10._shimmedLocalStreams[streamId];\n        }\n      });\n    }\n    return origRemoveTrack.apply(this, arguments);\n  };\n}\n\nfunction shimAddTrackRemoveTrack(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  var browserDetails = utils.detectBrowser(window);\n  // shim addTrack and removeTrack.\n  if (window.RTCPeerConnection.prototype.addTrack && browserDetails.version >= 65) {\n    return shimAddTrackRemoveTrackWithNative(window);\n  }\n\n  // also shim pc.getLocalStreams when addTrack is shimmed\n  // to return the original streams.\n  var origGetLocalStreams = window.RTCPeerConnection.prototype.getLocalStreams;\n  window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {\n    var _this11 = this;\n\n    var nativeStreams = origGetLocalStreams.apply(this);\n    this._reverseStreams = this._reverseStreams || {};\n    return nativeStreams.map(function (stream) {\n      return _this11._reverseStreams[stream.id];\n    });\n  };\n\n  var origAddStream = window.RTCPeerConnection.prototype.addStream;\n  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n    var _this12 = this;\n\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n\n    stream.getTracks().forEach(function (track) {\n      var alreadyExists = _this12.getSenders().find(function (s) {\n        return s.track === track;\n      });\n      if (alreadyExists) {\n        throw new DOMException('Track already exists.', 'InvalidAccessError');\n      }\n    });\n    // Add identity mapping for consistency with addTrack.\n    // Unless this is being used with a stream from addTrack.\n    if (!this._reverseStreams[stream.id]) {\n      var newStream = new window.MediaStream(stream.getTracks());\n      this._streams[stream.id] = newStream;\n      this._reverseStreams[newStream.id] = stream;\n      stream = newStream;\n    }\n    origAddStream.apply(this, [stream]);\n  };\n\n  var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;\n  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n\n    origRemoveStream.apply(this, [this._streams[stream.id] || stream]);\n    delete this._reverseStreams[this._streams[stream.id] ? this._streams[stream.id].id : stream.id];\n    delete this._streams[stream.id];\n  };\n\n  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {\n    var _this13 = this;\n\n    if (this.signalingState === 'closed') {\n      throw new DOMException('The RTCPeerConnection\\'s signalingState is \\'closed\\'.', 'InvalidStateError');\n    }\n    var streams = [].slice.call(arguments, 1);\n    if (streams.length !== 1 || !streams[0].getTracks().find(function (t) {\n      return t === track;\n    })) {\n      // this is not fully correct but all we can manage without\n      // [[associated MediaStreams]] internal slot.\n      throw new DOMException('The adapter.js addTrack polyfill only supports a single ' + ' stream which is associated with the specified track.', 'NotSupportedError');\n    }\n\n    var alreadyExists = this.getSenders().find(function (s) {\n      return s.track === track;\n    });\n    if (alreadyExists) {\n      throw new DOMException('Track already exists.', 'InvalidAccessError');\n    }\n\n    this._streams = this._streams || {};\n    this._reverseStreams = this._reverseStreams || {};\n    var oldStream = this._streams[stream.id];\n    if (oldStream) {\n      // this is using odd Chrome behaviour, use with caution:\n      // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815\n      // Note: we rely on the high-level addTrack/dtmf shim to\n      // create the sender with a dtmf sender.\n      oldStream.addTrack(track);\n\n      // Trigger ONN async.\n      Promise.resolve().then(function () {\n        _this13.dispatchEvent(new Event('negotiationneeded'));\n      });\n    } else {\n      var newStream = new window.MediaStream([track]);\n      this._streams[stream.id] = newStream;\n      this._reverseStreams[newStream.id] = stream;\n      this.addStream(newStream);\n    }\n    return this.getSenders().find(function (s) {\n      return s.track === track;\n    });\n  };\n\n  // replace the internal stream id with the external one and\n  // vice versa.\n  function replaceInternalStreamId(pc, description) {\n    var sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(function (internalId) {\n      var externalStream = pc._reverseStreams[internalId];\n      var internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(internalStream.id, 'g'), externalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp: sdp\n    });\n  }\n  function replaceExternalStreamId(pc, description) {\n    var sdp = description.sdp;\n    Object.keys(pc._reverseStreams || []).forEach(function (internalId) {\n      var externalStream = pc._reverseStreams[internalId];\n      var internalStream = pc._streams[externalStream.id];\n      sdp = sdp.replace(new RegExp(externalStream.id, 'g'), internalStream.id);\n    });\n    return new RTCSessionDescription({\n      type: description.type,\n      sdp: sdp\n    });\n  }\n  ['createOffer', 'createAnswer'].forEach(function (method) {\n    var nativeMethod = window.RTCPeerConnection.prototype[method];\n    var methodObj = _defineProperty({}, method, function () {\n      var _this14 = this;\n\n      var args = arguments;\n      var isLegacyCall = arguments.length && typeof arguments[0] === 'function';\n      if (isLegacyCall) {\n        return nativeMethod.apply(this, [function (description) {\n          var desc = replaceInternalStreamId(_this14, description);\n          args[0].apply(null, [desc]);\n        }, function (err) {\n          if (args[1]) {\n            args[1].apply(null, err);\n          }\n        }, arguments[2]]);\n      }\n      return nativeMethod.apply(this, arguments).then(function (description) {\n        return replaceInternalStreamId(_this14, description);\n      });\n    });\n    window.RTCPeerConnection.prototype[method] = methodObj[method];\n  });\n\n  var origSetLocalDescription = window.RTCPeerConnection.prototype.setLocalDescription;\n  window.RTCPeerConnection.prototype.setLocalDescription = function setLocalDescription() {\n    if (!arguments.length || !arguments[0].type) {\n      return origSetLocalDescription.apply(this, arguments);\n    }\n    arguments[0] = replaceExternalStreamId(this, arguments[0]);\n    return origSetLocalDescription.apply(this, arguments);\n  };\n\n  // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier\n\n  var origLocalDescription = Object.getOwnPropertyDescriptor(window.RTCPeerConnection.prototype, 'localDescription');\n  Object.defineProperty(window.RTCPeerConnection.prototype, 'localDescription', {\n    get: function get() {\n      var description = origLocalDescription.get.apply(this);\n      if (description.type === '') {\n        return description;\n      }\n      return replaceInternalStreamId(this, description);\n    }\n  });\n\n  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {\n    var _this15 = this;\n\n    if (this.signalingState === 'closed') {\n      throw new DOMException('The RTCPeerConnection\\'s signalingState is \\'closed\\'.', 'InvalidStateError');\n    }\n    // We can not yet check for sender instanceof RTCRtpSender\n    // since we shim RTPSender. So we check if sender._pc is set.\n    if (!sender._pc) {\n      throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' + 'does not implement interface RTCRtpSender.', 'TypeError');\n    }\n    var isLocal = sender._pc === this;\n    if (!isLocal) {\n      throw new DOMException('Sender was not created by this connection.', 'InvalidAccessError');\n    }\n\n    // Search for the native stream the senders track belongs to.\n    this._streams = this._streams || {};\n    var stream = void 0;\n    Object.keys(this._streams).forEach(function (streamid) {\n      var hasTrack = _this15._streams[streamid].getTracks().find(function (track) {\n        return sender.track === track;\n      });\n      if (hasTrack) {\n        stream = _this15._streams[streamid];\n      }\n    });\n\n    if (stream) {\n      if (stream.getTracks().length === 1) {\n        // if this is the last track of the stream, remove the stream. This\n        // takes care of any shimmed _senders.\n        this.removeStream(this._reverseStreams[stream.id]);\n      } else {\n        // relying on the same odd chrome behaviour as above.\n        stream.removeTrack(sender.track);\n      }\n      this.dispatchEvent(new Event('negotiationneeded'));\n    }\n  };\n}\n\nfunction shimPeerConnection(window) {\n  var browserDetails = utils.detectBrowser(window);\n\n  if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.webkitRTCPeerConnection;\n  }\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n\n  // shim implicit creation of RTCSessionDescription/RTCIceCandidate\n  if (browserDetails.version < 53) {\n    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {\n      var nativeMethod = window.RTCPeerConnection.prototype[method];\n      var methodObj = _defineProperty({}, method, function () {\n        arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);\n        return nativeMethod.apply(this, arguments);\n      });\n      window.RTCPeerConnection.prototype[method] = methodObj[method];\n    });\n  }\n\n  // support for addIceCandidate(null or undefined)\n  var nativeAddIceCandidate = window.RTCPeerConnection.prototype.addIceCandidate;\n  window.RTCPeerConnection.prototype.addIceCandidate = function addIceCandidate() {\n    if (!arguments[0]) {\n      if (arguments[1]) {\n        arguments[1].apply(null);\n      }\n      return Promise.resolve();\n    }\n    // Firefox 68+ emits and processes {candidate: \"\", ...}, ignore\n    // in older versions. Native support planned for Chrome M77.\n    if (browserDetails.version < 78 && arguments[0] && arguments[0].candidate === '') {\n      return Promise.resolve();\n    }\n    return nativeAddIceCandidate.apply(this, arguments);\n  };\n}\n\nfunction fixNegotiationNeeded(window) {\n  utils.wrapPeerConnectionEvent(window, 'negotiationneeded', function (e) {\n    var pc = e.target;\n    if (pc.signalingState !== 'stable') {\n      return;\n    }\n    return e;\n  });\n}\n\n},{\"../utils.js\":15,\"./getdisplaymedia\":4,\"./getusermedia\":5}],4:[function(require,module,exports){\n/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\nexports.shimGetDisplayMedia = shimGetDisplayMedia;\nfunction shimGetDisplayMedia(window, getSourceId) {\n  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!window.navigator.mediaDevices) {\n    return;\n  }\n  // getSourceId is a function that returns a promise resolving with\n  // the sourceId of the screen/window/tab to be shared.\n  if (typeof getSourceId !== 'function') {\n    console.error('shimGetDisplayMedia: getSourceId argument is not ' + 'a function');\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia = function getDisplayMedia(constraints) {\n    return getSourceId(constraints).then(function (sourceId) {\n      var widthSpecified = constraints.video && constraints.video.width;\n      var heightSpecified = constraints.video && constraints.video.height;\n      var frameRateSpecified = constraints.video && constraints.video.frameRate;\n      constraints.video = {\n        mandatory: {\n          chromeMediaSource: 'desktop',\n          chromeMediaSourceId: sourceId,\n          maxFrameRate: frameRateSpecified || 3\n        }\n      };\n      if (widthSpecified) {\n        constraints.video.mandatory.maxWidth = widthSpecified;\n      }\n      if (heightSpecified) {\n        constraints.video.mandatory.maxHeight = heightSpecified;\n      }\n      return window.navigator.mediaDevices.getUserMedia(constraints);\n    });\n  };\n}\n\n},{}],5:[function(require,module,exports){\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nexports.shimGetUserMedia = shimGetUserMedia;\n\nvar _utils = require('../utils.js');\n\nvar utils = _interopRequireWildcard(_utils);\n\nfunction _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }\n\nvar logging = utils.log;\n\nfunction shimGetUserMedia(window) {\n  var navigator = window && window.navigator;\n\n  if (!navigator.mediaDevices) {\n    return;\n  }\n\n  var browserDetails = utils.detectBrowser(window);\n\n  var constraintsToChrome_ = function constraintsToChrome_(c) {\n    if ((typeof c === 'undefined' ? 'undefined' : _typeof(c)) !== 'object' || c.mandatory || c.optional) {\n      return c;\n    }\n    var cc = {};\n    Object.keys(c).forEach(function (key) {\n      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {\n        return;\n      }\n      var r = _typeof(c[key]) === 'object' ? c[key] : { ideal: c[key] };\n      if (r.exact !== undefined && typeof r.exact === 'number') {\n        r.min = r.max = r.exact;\n      }\n      var oldname_ = function oldname_(prefix, name) {\n        if (prefix) {\n          return prefix + name.charAt(0).toUpperCase() + name.slice(1);\n        }\n        return name === 'deviceId' ? 'sourceId' : name;\n      };\n      if (r.ideal !== undefined) {\n        cc.optional = cc.optional || [];\n        var oc = {};\n        if (typeof r.ideal === 'number') {\n          oc[oldname_('min', key)] = r.ideal;\n          cc.optional.push(oc);\n          oc = {};\n          oc[oldname_('max', key)] = r.ideal;\n          cc.optional.push(oc);\n        } else {\n          oc[oldname_('', key)] = r.ideal;\n          cc.optional.push(oc);\n        }\n      }\n      if (r.exact !== undefined && typeof r.exact !== 'number') {\n        cc.mandatory = cc.mandatory || {};\n        cc.mandatory[oldname_('', key)] = r.exact;\n      } else {\n        ['min', 'max'].forEach(function (mix) {\n          if (r[mix] !== undefined) {\n            cc.mandatory = cc.mandatory || {};\n            cc.mandatory[oldname_(mix, key)] = r[mix];\n          }\n        });\n      }\n    });\n    if (c.advanced) {\n      cc.optional = (cc.optional || []).concat(c.advanced);\n    }\n    return cc;\n  };\n\n  var shimConstraints_ = function shimConstraints_(constraints, func) {\n    if (browserDetails.version >= 61) {\n      return func(constraints);\n    }\n    constraints = JSON.parse(JSON.stringify(constraints));\n    if (constraints && _typeof(constraints.audio) === 'object') {\n      var remap = function remap(obj, a, b) {\n        if (a in obj && !(b in obj)) {\n          obj[b] = obj[a];\n          delete obj[a];\n        }\n      };\n      constraints = JSON.parse(JSON.stringify(constraints));\n      remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');\n      remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');\n      constraints.audio = constraintsToChrome_(constraints.audio);\n    }\n    if (constraints && _typeof(constraints.video) === 'object') {\n      // Shim facingMode for mobile & surface pro.\n      var face = constraints.video.facingMode;\n      face = face && ((typeof face === 'undefined' ? 'undefined' : _typeof(face)) === 'object' ? face : { ideal: face });\n      var getSupportedFacingModeLies = browserDetails.version < 66;\n\n      if (face && (face.exact === 'user' || face.exact === 'environment' || face.ideal === 'user' || face.ideal === 'environment') && !(navigator.mediaDevices.getSupportedConstraints && navigator.mediaDevices.getSupportedConstraints().facingMode && !getSupportedFacingModeLies)) {\n        delete constraints.video.facingMode;\n        var matches = void 0;\n        if (face.exact === 'environment' || face.ideal === 'environment') {\n          matches = ['back', 'rear'];\n        } else if (face.exact === 'user' || face.ideal === 'user') {\n          matches = ['front'];\n        }\n        if (matches) {\n          // Look for matches in label, or use last cam for back (typical).\n          return navigator.mediaDevices.enumerateDevices().then(function (devices) {\n            devices = devices.filter(function (d) {\n              return d.kind === 'videoinput';\n            });\n            var dev = devices.find(function (d) {\n              return matches.some(function (match) {\n                return d.label.toLowerCase().includes(match);\n              });\n            });\n            if (!dev && devices.length && matches.includes('back')) {\n              dev = devices[devices.length - 1]; // more likely the back cam\n            }\n            if (dev) {\n              constraints.video.deviceId = face.exact ? { exact: dev.deviceId } : { ideal: dev.deviceId };\n            }\n            constraints.video = constraintsToChrome_(constraints.video);\n            logging('chrome: ' + JSON.stringify(constraints));\n            return func(constraints);\n          });\n        }\n      }\n      constraints.video = constraintsToChrome_(constraints.video);\n    }\n    logging('chrome: ' + JSON.stringify(constraints));\n    return func(constraints);\n  };\n\n  var shimError_ = function shimError_(e) {\n    if (browserDetails.version >= 64) {\n      return e;\n    }\n    return {\n      name: {\n        PermissionDeniedError: 'NotAllowedError',\n        PermissionDismissedError: 'NotAllowedError',\n        InvalidStateError: 'NotAllowedError',\n        DevicesNotFoundError: 'NotFoundError',\n        ConstraintNotSatisfiedError: 'OverconstrainedError',\n        TrackStartError: 'NotReadableError',\n        MediaDeviceFailedDueToShutdown: 'NotAllowedError',\n        MediaDeviceKillSwitchOn: 'NotAllowedError',\n        TabCaptureError: 'AbortError',\n        ScreenCaptureError: 'AbortError',\n        DeviceCaptureError: 'AbortError'\n      }[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint || e.constraintName,\n      toString: function toString() {\n        return this.name + (this.message && ': ') + this.message;\n      }\n    };\n  };\n\n  var getUserMedia_ = function getUserMedia_(constraints, onSuccess, onError) {\n    shimConstraints_(constraints, function (c) {\n      navigator.webkitGetUserMedia(c, onSuccess, function (e) {\n        if (onError) {\n          onError(shimError_(e));\n        }\n      });\n    });\n  };\n  navigator.getUserMedia = getUserMedia_.bind(navigator);\n\n  // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia\n  // function which returns a Promise, it does not accept spec-style\n  // constraints.\n  if (navigator.mediaDevices.getUserMedia) {\n    var origGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);\n    navigator.mediaDevices.getUserMedia = function (cs) {\n      return shimConstraints_(cs, function (c) {\n        return origGetUserMedia(c).then(function (stream) {\n          if (c.audio && !stream.getAudioTracks().length || c.video && !stream.getVideoTracks().length) {\n            stream.getTracks().forEach(function (track) {\n              track.stop();\n            });\n            throw new DOMException('', 'NotFoundError');\n          }\n          return stream;\n        }, function (e) {\n          return Promise.reject(shimError_(e));\n        });\n      });\n    };\n  }\n}\n\n},{\"../utils.js\":15}],6:[function(require,module,exports){\n/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nexports.shimRTCIceCandidate = shimRTCIceCandidate;\nexports.shimMaxMessageSize = shimMaxMessageSize;\nexports.shimSendThrowTypeError = shimSendThrowTypeError;\nexports.shimConnectionState = shimConnectionState;\nexports.removeAllowExtmapMixed = removeAllowExtmapMixed;\n\nvar _sdp = require('sdp');\n\nvar _sdp2 = _interopRequireDefault(_sdp);\n\nvar _utils = require('./utils');\n\nvar utils = _interopRequireWildcard(_utils);\n\nfunction _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }\n\nfunction _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }\n\nfunction shimRTCIceCandidate(window) {\n  // foundation is arbitrarily chosen as an indicator for full support for\n  // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface\n  if (!window.RTCIceCandidate || window.RTCIceCandidate && 'foundation' in window.RTCIceCandidate.prototype) {\n    return;\n  }\n\n  var NativeRTCIceCandidate = window.RTCIceCandidate;\n  window.RTCIceCandidate = function RTCIceCandidate(args) {\n    // Remove the a= which shouldn't be part of the candidate string.\n    if ((typeof args === 'undefined' ? 'undefined' : _typeof(args)) === 'object' && args.candidate && args.candidate.indexOf('a=') === 0) {\n      args = JSON.parse(JSON.stringify(args));\n      args.candidate = args.candidate.substr(2);\n    }\n\n    if (args.candidate && args.candidate.length) {\n      // Augment the native candidate with the parsed fields.\n      var nativeCandidate = new NativeRTCIceCandidate(args);\n      var parsedCandidate = _sdp2.default.parseCandidate(args.candidate);\n      var augmentedCandidate = Object.assign(nativeCandidate, parsedCandidate);\n\n      // Add a serializer that does not serialize the extra attributes.\n      augmentedCandidate.toJSON = function toJSON() {\n        return {\n          candidate: augmentedCandidate.candidate,\n          sdpMid: augmentedCandidate.sdpMid,\n          sdpMLineIndex: augmentedCandidate.sdpMLineIndex,\n          usernameFragment: augmentedCandidate.usernameFragment\n        };\n      };\n      return augmentedCandidate;\n    }\n    return new NativeRTCIceCandidate(args);\n  };\n  window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype;\n\n  // Hook up the augmented candidate in onicecandidate and\n  // addEventListener('icecandidate', ...)\n  utils.wrapPeerConnectionEvent(window, 'icecandidate', function (e) {\n    if (e.candidate) {\n      Object.defineProperty(e, 'candidate', {\n        value: new window.RTCIceCandidate(e.candidate),\n        writable: 'false'\n      });\n    }\n    return e;\n  });\n}\n\nfunction shimMaxMessageSize(window) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  var browserDetails = utils.detectBrowser(window);\n\n  if (!('sctp' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {\n      get: function get() {\n        return typeof this._sctp === 'undefined' ? null : this._sctp;\n      }\n    });\n  }\n\n  var sctpInDescription = function sctpInDescription(description) {\n    if (!description || !description.sdp) {\n      return false;\n    }\n    var sections = _sdp2.default.splitSections(description.sdp);\n    sections.shift();\n    return sections.some(function (mediaSection) {\n      var mLine = _sdp2.default.parseMLine(mediaSection);\n      return mLine && mLine.kind === 'application' && mLine.protocol.indexOf('SCTP') !== -1;\n    });\n  };\n\n  var getRemoteFirefoxVersion = function getRemoteFirefoxVersion(description) {\n    // TODO: Is there a better solution for detecting Firefox?\n    var match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\\d+)/);\n    if (match === null || match.length < 2) {\n      return -1;\n    }\n    var version = parseInt(match[1], 10);\n    // Test for NaN (yes, this is ugly)\n    return version !== version ? -1 : version;\n  };\n\n  var getCanSendMaxMessageSize = function getCanSendMaxMessageSize(remoteIsFirefox) {\n    // Every implementation we know can send at least 64 KiB.\n    // Note: Although Chrome is technically able to send up to 256 KiB, the\n    //       data does not reach the other peer reliably.\n    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419\n    var canSendMaxMessageSize = 65536;\n    if (browserDetails.browser === 'firefox') {\n      if (browserDetails.version < 57) {\n        if (remoteIsFirefox === -1) {\n          // FF < 57 will send in 16 KiB chunks using the deprecated PPID\n          // fragmentation.\n          canSendMaxMessageSize = 16384;\n        } else {\n          // However, other FF (and RAWRTC) can reassemble PPID-fragmented\n          // messages. Thus, supporting ~2 GiB when sending.\n          canSendMaxMessageSize = 2147483637;\n        }\n      } else if (browserDetails.version < 60) {\n        // Currently, all FF >= 57 will reset the remote maximum message size\n        // to the default value when a data channel is created at a later\n        // stage. :(\n        // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n        canSendMaxMessageSize = browserDetails.version === 57 ? 65535 : 65536;\n      } else {\n        // FF >= 60 supports sending ~2 GiB\n        canSendMaxMessageSize = 2147483637;\n      }\n    }\n    return canSendMaxMessageSize;\n  };\n\n  var getMaxMessageSize = function getMaxMessageSize(description, remoteIsFirefox) {\n    // Note: 65536 bytes is the default value from the SDP spec. Also,\n    //       every implementation we know supports receiving 65536 bytes.\n    var maxMessageSize = 65536;\n\n    // FF 57 has a slightly incorrect default remote max message size, so\n    // we need to adjust it here to avoid a failure when sending.\n    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697\n    if (browserDetails.browser === 'firefox' && browserDetails.version === 57) {\n      maxMessageSize = 65535;\n    }\n\n    var match = _sdp2.default.matchPrefix(description.sdp, 'a=max-message-size:');\n    if (match.length > 0) {\n      maxMessageSize = parseInt(match[0].substr(19), 10);\n    } else if (browserDetails.browser === 'firefox' && remoteIsFirefox !== -1) {\n      // If the maximum message size is not present in the remote SDP and\n      // both local and remote are Firefox, the remote peer can receive\n      // ~2 GiB.\n      maxMessageSize = 2147483637;\n    }\n    return maxMessageSize;\n  };\n\n  var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {\n    this._sctp = null;\n    // Chrome decided to not expose .sctp in plan-b mode.\n    // As usual, adapter.js has to do an 'ugly worakaround'\n    // to cover up the mess.\n    if (browserDetails.browser === 'chrome' && browserDetails.version >= 76) {\n      var _getConfiguration = this.getConfiguration(),\n          sdpSemantics = _getConfiguration.sdpSemantics;\n\n      if (sdpSemantics === 'plan-b') {\n        Object.defineProperty(this, 'sctp', {\n          get: function get() {\n            return typeof this._sctp === 'undefined' ? null : this._sctp;\n          },\n\n          enumerable: true,\n          configurable: true\n        });\n      }\n    }\n\n    if (sctpInDescription(arguments[0])) {\n      // Check if the remote is FF.\n      var isFirefox = getRemoteFirefoxVersion(arguments[0]);\n\n      // Get the maximum message size the local peer is capable of sending\n      var canSendMMS = getCanSendMaxMessageSize(isFirefox);\n\n      // Get the maximum message size of the remote peer.\n      var remoteMMS = getMaxMessageSize(arguments[0], isFirefox);\n\n      // Determine final maximum message size\n      var maxMessageSize = void 0;\n      if (canSendMMS === 0 && remoteMMS === 0) {\n        maxMessageSize = Number.POSITIVE_INFINITY;\n      } else if (canSendMMS === 0 || remoteMMS === 0) {\n        maxMessageSize = Math.max(canSendMMS, remoteMMS);\n      } else {\n        maxMessageSize = Math.min(canSendMMS, remoteMMS);\n      }\n\n      // Create a dummy RTCSctpTransport object and the 'maxMessageSize'\n      // attribute.\n      var sctp = {};\n      Object.defineProperty(sctp, 'maxMessageSize', {\n        get: function get() {\n          return maxMessageSize;\n        }\n      });\n      this._sctp = sctp;\n    }\n\n    return origSetRemoteDescription.apply(this, arguments);\n  };\n}\n\nfunction shimSendThrowTypeError(window) {\n  if (!(window.RTCPeerConnection && 'createDataChannel' in window.RTCPeerConnection.prototype)) {\n    return;\n  }\n\n  // Note: Although Firefox >= 57 has a native implementation, the maximum\n  //       message size can be reset for all data channels at a later stage.\n  //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831\n\n  function wrapDcSend(dc, pc) {\n    var origDataChannelSend = dc.send;\n    dc.send = function send() {\n      var data = arguments[0];\n      var length = data.length || data.size || data.byteLength;\n      if (dc.readyState === 'open' && pc.sctp && length > pc.sctp.maxMessageSize) {\n        throw new TypeError('Message too large (can send a maximum of ' + pc.sctp.maxMessageSize + ' bytes)');\n      }\n      return origDataChannelSend.apply(dc, arguments);\n    };\n  }\n  var origCreateDataChannel = window.RTCPeerConnection.prototype.createDataChannel;\n  window.RTCPeerConnection.prototype.createDataChannel = function createDataChannel() {\n    var dataChannel = origCreateDataChannel.apply(this, arguments);\n    wrapDcSend(dataChannel, this);\n    return dataChannel;\n  };\n  utils.wrapPeerConnectionEvent(window, 'datachannel', function (e) {\n    wrapDcSend(e.channel, e.target);\n    return e;\n  });\n}\n\n/* shims RTCConnectionState by pretending it is the same as iceConnectionState.\n * See https://bugs.chromium.org/p/webrtc/issues/detail?id=6145#c12\n * for why this is a valid hack in Chrome. In Firefox it is slightly incorrect\n * since DTLS failures would be hidden. See\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1265827\n * for the Firefox tracking bug.\n */\nfunction shimConnectionState(window) {\n  if (!window.RTCPeerConnection || 'connectionState' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  var proto = window.RTCPeerConnection.prototype;\n  Object.defineProperty(proto, 'connectionState', {\n    get: function get() {\n      return {\n        completed: 'connected',\n        checking: 'connecting'\n      }[this.iceConnectionState] || this.iceConnectionState;\n    },\n\n    enumerable: true,\n    configurable: true\n  });\n  Object.defineProperty(proto, 'onconnectionstatechange', {\n    get: function get() {\n      return this._onconnectionstatechange || null;\n    },\n    set: function set(cb) {\n      if (this._onconnectionstatechange) {\n        this.removeEventListener('connectionstatechange', this._onconnectionstatechange);\n        delete this._onconnectionstatechange;\n      }\n      if (cb) {\n        this.addEventListener('connectionstatechange', this._onconnectionstatechange = cb);\n      }\n    },\n\n    enumerable: true,\n    configurable: true\n  });\n\n  ['setLocalDescription', 'setRemoteDescription'].forEach(function (method) {\n    var origMethod = proto[method];\n    proto[method] = function () {\n      if (!this._connectionstatechangepoly) {\n        this._connectionstatechangepoly = function (e) {\n          var pc = e.target;\n          if (pc._lastConnectionState !== pc.connectionState) {\n            pc._lastConnectionState = pc.connectionState;\n            var newEvent = new Event('connectionstatechange', e);\n            pc.dispatchEvent(newEvent);\n          }\n          return e;\n        };\n        this.addEventListener('iceconnectionstatechange', this._connectionstatechangepoly);\n      }\n      return origMethod.apply(this, arguments);\n    };\n  });\n}\n\nfunction removeAllowExtmapMixed(window) {\n  /* remove a=extmap-allow-mixed for Chrome < M71 */\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  var browserDetails = utils.detectBrowser(window);\n  if (browserDetails.browser === 'chrome' && browserDetails.version >= 71) {\n    return;\n  }\n  var nativeSRD = window.RTCPeerConnection.prototype.setRemoteDescription;\n  window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription(desc) {\n    if (desc && desc.sdp && desc.sdp.indexOf('\\na=extmap-allow-mixed') !== -1) {\n      desc.sdp = desc.sdp.split('\\n').filter(function (line) {\n        return line.trim() !== 'a=extmap-allow-mixed';\n      }).join('\\n');\n    }\n    return nativeSRD.apply(this, arguments);\n  };\n}\n\n},{\"./utils\":15,\"sdp\":17}],7:[function(require,module,exports){\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\nexports.shimGetDisplayMedia = exports.shimGetUserMedia = undefined;\n\nvar _getusermedia = require('./getusermedia');\n\nObject.defineProperty(exports, 'shimGetUserMedia', {\n  enumerable: true,\n  get: function get() {\n    return _getusermedia.shimGetUserMedia;\n  }\n});\n\nvar _getdisplaymedia = require('./getdisplaymedia');\n\nObject.defineProperty(exports, 'shimGetDisplayMedia', {\n  enumerable: true,\n  get: function get() {\n    return _getdisplaymedia.shimGetDisplayMedia;\n  }\n});\nexports.shimPeerConnection = shimPeerConnection;\nexports.shimReplaceTrack = shimReplaceTrack;\n\nvar _utils = require('../utils');\n\nvar utils = _interopRequireWildcard(_utils);\n\nvar _filtericeservers = require('./filtericeservers');\n\nvar _rtcpeerconnectionShim = require('rtcpeerconnection-shim');\n\nvar _rtcpeerconnectionShim2 = _interopRequireDefault(_rtcpeerconnectionShim);\n\nfunction _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }\n\nfunction _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }\n\nfunction shimPeerConnection(window) {\n  var browserDetails = utils.detectBrowser(window);\n\n  if (window.RTCIceGatherer) {\n    if (!window.RTCIceCandidate) {\n      window.RTCIceCandidate = function RTCIceCandidate(args) {\n        return args;\n      };\n    }\n    if (!window.RTCSessionDescription) {\n      window.RTCSessionDescription = function RTCSessionDescription(args) {\n        return args;\n      };\n    }\n    // this adds an additional event listener to MediaStrackTrack that signals\n    // when a tracks enabled property was changed. Workaround for a bug in\n    // addStream, see below. No longer required in 15025+\n    if (browserDetails.version < 15025) {\n      var origMSTEnabled = Object.getOwnPropertyDescriptor(window.MediaStreamTrack.prototype, 'enabled');\n      Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {\n        set: function set(value) {\n          origMSTEnabled.set.call(this, value);\n          var ev = new Event('enabled');\n          ev.enabled = value;\n          this.dispatchEvent(ev);\n        }\n      });\n    }\n  }\n\n  // ORTC defines the DTMF sender a bit different.\n  // https://github.com/w3c/ortc/issues/714\n  if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {\n    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {\n      get: function get() {\n        if (this._dtmf === undefined) {\n          if (this.track.kind === 'audio') {\n            this._dtmf = new window.RTCDtmfSender(this);\n          } else if (this.track.kind === 'video') {\n            this._dtmf = null;\n          }\n        }\n        return this._dtmf;\n      }\n    });\n  }\n  // Edge currently only implements the RTCDtmfSender, not the\n  // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*\n  if (window.RTCDtmfSender && !window.RTCDTMFSender) {\n    window.RTCDTMFSender = window.RTCDtmfSender;\n  }\n\n  var RTCPeerConnectionShim = (0, _rtcpeerconnectionShim2.default)(window, browserDetails.version);\n  window.RTCPeerConnection = function RTCPeerConnection(config) {\n    if (config && config.iceServers) {\n      config.iceServers = (0, _filtericeservers.filterIceServers)(config.iceServers, browserDetails.version);\n      utils.log('ICE servers after filtering:', config.iceServers);\n    }\n    return new RTCPeerConnectionShim(config);\n  };\n  window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;\n}\n\nfunction shimReplaceTrack(window) {\n  // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614\n  if (window.RTCRtpSender && !('replaceTrack' in window.RTCRtpSender.prototype)) {\n    window.RTCRtpSender.prototype.replaceTrack = window.RTCRtpSender.prototype.setTrack;\n  }\n}\n\n},{\"../utils\":15,\"./filtericeservers\":8,\"./getdisplaymedia\":9,\"./getusermedia\":10,\"rtcpeerconnection-shim\":16}],8:[function(require,module,exports){\n/*\n *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\nexports.filterIceServers = filterIceServers;\n\nvar _utils = require('../utils');\n\nvar utils = _interopRequireWildcard(_utils);\n\nfunction _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }\n\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nfunction filterIceServers(iceServers, edgeVersion) {\n  var hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(function (server) {\n    if (server && (server.urls || server.url)) {\n      var urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n      }\n      var isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(function (url) {\n        // filter STUN unconditionally.\n        if (url.indexOf('stun:') === 0) {\n          return false;\n        }\n\n        var validTurn = url.startsWith('turn') && !url.startsWith('turn:[') && url.includes('transport=udp');\n        if (validTurn && !hasTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return validTurn && !hasTurn;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n\n},{\"../utils\":15}],9:[function(require,module,exports){\n/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\nexports.shimGetDisplayMedia = shimGetDisplayMedia;\nfunction shimGetDisplayMedia(window) {\n  if (!('getDisplayMedia' in window.navigator)) {\n    return;\n  }\n  if (!window.navigator.mediaDevices) {\n    return;\n  }\n  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia = window.navigator.getDisplayMedia.bind(window.navigator);\n}\n\n},{}],10:[function(require,module,exports){\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\nexports.shimGetUserMedia = shimGetUserMedia;\nfunction shimGetUserMedia(window) {\n  var navigator = window && window.navigator;\n\n  var shimError_ = function shimError_(e) {\n    return {\n      name: { PermissionDeniedError: 'NotAllowedError' }[e.name] || e.name,\n      message: e.message,\n      constraint: e.constraint,\n      toString: function toString() {\n        return this.name;\n      }\n    };\n  };\n\n  // getUserMedia error shim.\n  var origGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);\n  navigator.mediaDevices.getUserMedia = function (c) {\n    return origGetUserMedia(c).catch(function (e) {\n      return Promise.reject(shimError_(e));\n    });\n  };\n}\n\n},{}],11:[function(require,module,exports){\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\nexports.shimGetDisplayMedia = exports.shimGetUserMedia = undefined;\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nvar _getusermedia = require('./getusermedia');\n\nObject.defineProperty(exports, 'shimGetUserMedia', {\n  enumerable: true,\n  get: function get() {\n    return _getusermedia.shimGetUserMedia;\n  }\n});\n\nvar _getdisplaymedia = require('./getdisplaymedia');\n\nObject.defineProperty(exports, 'shimGetDisplayMedia', {\n  enumerable: true,\n  get: function get() {\n    return _getdisplaymedia.shimGetDisplayMedia;\n  }\n});\nexports.shimOnTrack = shimOnTrack;\nexports.shimPeerConnection = shimPeerConnection;\nexports.shimSenderGetStats = shimSenderGetStats;\nexports.shimReceiverGetStats = shimReceiverGetStats;\nexports.shimRemoveStream = shimRemoveStream;\nexports.shimRTCDataChannel = shimRTCDataChannel;\nexports.shimAddTransceiver = shimAddTransceiver;\nexports.shimCreateOffer = shimCreateOffer;\nexports.shimCreateAnswer = shimCreateAnswer;\n\nvar _utils = require('../utils');\n\nvar utils = _interopRequireWildcard(_utils);\n\nfunction _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nfunction shimOnTrack(window) {\n  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCTrackEvent && 'receiver' in window.RTCTrackEvent.prototype && !('transceiver' in window.RTCTrackEvent.prototype)) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get: function get() {\n        return { receiver: this.receiver };\n      }\n    });\n  }\n}\n\nfunction shimPeerConnection(window) {\n  var browserDetails = utils.detectBrowser(window);\n\n  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !(window.RTCPeerConnection || window.mozRTCPeerConnection)) {\n    return; // probably media.peerconnection.enabled=false in about:config\n  }\n  if (!window.RTCPeerConnection && window.mozRTCPeerConnection) {\n    // very basic support for old versions.\n    window.RTCPeerConnection = window.mozRTCPeerConnection;\n  }\n\n  if (browserDetails.version < 53) {\n    // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.\n    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {\n      var nativeMethod = window.RTCPeerConnection.prototype[method];\n      var methodObj = _defineProperty({}, method, function () {\n        arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);\n        return nativeMethod.apply(this, arguments);\n      });\n      window.RTCPeerConnection.prototype[method] = methodObj[method];\n    });\n  }\n\n  // support for addIceCandidate(null or undefined)\n  // as well as ignoring {sdpMid, candidate: \"\"}\n  if (browserDetails.version < 68) {\n    var nativeAddIceCandidate = window.RTCPeerConnection.prototype.addIceCandidate;\n    window.RTCPeerConnection.prototype.addIceCandidate = function addIceCandidate() {\n      if (!arguments[0]) {\n        if (arguments[1]) {\n          arguments[1].apply(null);\n        }\n        return Promise.resolve();\n      }\n      // Firefox 68+ emits and processes {candidate: \"\", ...}, ignore\n      // in older versions.\n      if (arguments[0] && arguments[0].candidate === '') {\n        return Promise.resolve();\n      }\n      return nativeAddIceCandidate.apply(this, arguments);\n    };\n  }\n\n  var modernStatsTypes = {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  };\n\n  var nativeGetStats = window.RTCPeerConnection.prototype.getStats;\n  window.RTCPeerConnection.prototype.getStats = function getStats() {\n    var _arguments = Array.prototype.slice.call(arguments),\n        selector = _arguments[0],\n        onSucc = _arguments[1],\n        onErr = _arguments[2];\n\n    return nativeGetStats.apply(this, [selector || null]).then(function (stats) {\n      if (browserDetails.version < 53 && !onSucc) {\n        // Shim only promise getStats with spec-hyphens in type names\n        // Leave callback version alone; misc old uses of forEach before Map\n        try {\n          stats.forEach(function (stat) {\n            stat.type = modernStatsTypes[stat.type] || stat.type;\n          });\n        } catch (e) {\n          if (e.name !== 'TypeError') {\n            throw e;\n          }\n          // Avoid TypeError: \"type\" is read-only, in old versions. 34-43ish\n          stats.forEach(function (stat, i) {\n            stats.set(i, Object.assign({}, stat, {\n              type: modernStatsTypes[stat.type] || stat.type\n            }));\n          });\n        }\n      }\n      return stats;\n    }).then(onSucc, onErr);\n  };\n}\n\nfunction shimSenderGetStats(window) {\n  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {\n    return;\n  }\n  var origGetSenders = window.RTCPeerConnection.prototype.getSenders;\n  if (origGetSenders) {\n    window.RTCPeerConnection.prototype.getSenders = function getSenders() {\n      var _this = this;\n\n      var senders = origGetSenders.apply(this, []);\n      senders.forEach(function (sender) {\n        return sender._pc = _this;\n      });\n      return senders;\n    };\n  }\n\n  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;\n  if (origAddTrack) {\n    window.RTCPeerConnection.prototype.addTrack = function addTrack() {\n      var sender = origAddTrack.apply(this, arguments);\n      sender._pc = this;\n      return sender;\n    };\n  }\n  window.RTCRtpSender.prototype.getStats = function getStats() {\n    return this.track ? this._pc.getStats(this.track) : Promise.resolve(new Map());\n  };\n}\n\nfunction shimReceiverGetStats(window) {\n  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && window.RTCRtpSender)) {\n    return;\n  }\n  if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {\n    return;\n  }\n  var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;\n  if (origGetReceivers) {\n    window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {\n      var _this2 = this;\n\n      var receivers = origGetReceivers.apply(this, []);\n      receivers.forEach(function (receiver) {\n        return receiver._pc = _this2;\n      });\n      return receivers;\n    };\n  }\n  utils.wrapPeerConnectionEvent(window, 'track', function (e) {\n    e.receiver._pc = e.srcElement;\n    return e;\n  });\n  window.RTCRtpReceiver.prototype.getStats = function getStats() {\n    return this._pc.getStats(this.track);\n  };\n}\n\nfunction shimRemoveStream(window) {\n  if (!window.RTCPeerConnection || 'removeStream' in window.RTCPeerConnection.prototype) {\n    return;\n  }\n  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {\n    var _this3 = this;\n\n    utils.deprecated('removeStream', 'removeTrack');\n    this.getSenders().forEach(function (sender) {\n      if (sender.track && stream.getTracks().includes(sender.track)) {\n        _this3.removeTrack(sender);\n      }\n    });\n  };\n}\n\nfunction shimRTCDataChannel(window) {\n  // rename DataChannel to RTCDataChannel (native fix in FF60):\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851\n  if (window.DataChannel && !window.RTCDataChannel) {\n    window.RTCDataChannel = window.DataChannel;\n  }\n}\n\nfunction shimAddTransceiver(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  var origAddTransceiver = window.RTCPeerConnection.prototype.addTransceiver;\n  if (origAddTransceiver) {\n    window.RTCPeerConnection.prototype.addTransceiver = function addTransceiver() {\n      this.setParametersPromises = [];\n      var initParameters = arguments[1];\n      var shouldPerformCheck = initParameters && 'sendEncodings' in initParameters;\n      if (shouldPerformCheck) {\n        // If sendEncodings params are provided, validate grammar\n        initParameters.sendEncodings.forEach(function (encodingParam) {\n          if ('rid' in encodingParam) {\n            var ridRegex = /^[a-z0-9]{0,16}$/i;\n            if (!ridRegex.test(encodingParam.rid)) {\n              throw new TypeError('Invalid RID value provided.');\n            }\n          }\n          if ('scaleResolutionDownBy' in encodingParam) {\n            if (!(parseFloat(encodingParam.scaleResolutionDownBy) >= 1.0)) {\n              throw new RangeError('scale_resolution_down_by must be >= 1.0');\n            }\n          }\n          if ('maxFramerate' in encodingParam) {\n            if (!(parseFloat(encodingParam.maxFramerate) >= 0)) {\n              throw new RangeError('max_framerate must be >= 0.0');\n            }\n          }\n        });\n      }\n      var transceiver = origAddTransceiver.apply(this, arguments);\n      if (shouldPerformCheck) {\n        // Check if the init options were applied. If not we do this in an\n        // asynchronous way and save the promise reference in a global object.\n        // This is an ugly hack, but at the same time is way more robust than\n        // checking the sender parameters before and after the createOffer\n        // Also note that after the createoffer we are not 100% sure that\n        // the params were asynchronously applied so we might miss the\n        // opportunity to recreate offer.\n        var sender = transceiver.sender;\n\n        var params = sender.getParameters();\n        if (!('encodings' in params)) {\n          params.encodings = initParameters.sendEncodings;\n          this.setParametersPromises.push(sender.setParameters(params).catch(function () {}));\n        }\n      }\n      return transceiver;\n    };\n  }\n}\n\nfunction shimCreateOffer(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n  window.RTCPeerConnection.prototype.createOffer = function createOffer() {\n    var _this4 = this,\n        _arguments2 = arguments;\n\n    if (this.setParametersPromises && this.setParametersPromises.length) {\n      return Promise.all(this.setParametersPromises).then(function () {\n        return origCreateOffer.apply(_this4, _arguments2);\n      }).finally(function () {\n        _this4.setParametersPromises = [];\n      });\n    }\n    return origCreateOffer.apply(this, arguments);\n  };\n}\n\nfunction shimCreateAnswer(window) {\n  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647\n  // Firefox ignores the init sendEncodings options passed to addTransceiver\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918\n  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection)) {\n    return;\n  }\n  var origCreateAnswer = window.RTCPeerConnection.prototype.createAnswer;\n  window.RTCPeerConnection.prototype.createAnswer = function createAnswer() {\n    var _this5 = this,\n        _arguments3 = arguments;\n\n    if (this.setParametersPromises && this.setParametersPromises.length) {\n      return Promise.all(this.setParametersPromises).then(function () {\n        return origCreateAnswer.apply(_this5, _arguments3);\n      }).finally(function () {\n        _this5.setParametersPromises = [];\n      });\n    }\n    return origCreateAnswer.apply(this, arguments);\n  };\n}\n\n},{\"../utils\":15,\"./getdisplaymedia\":12,\"./getusermedia\":13}],12:[function(require,module,exports){\n/*\n *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\nexports.shimGetDisplayMedia = shimGetDisplayMedia;\nfunction shimGetDisplayMedia(window, preferredMediaSource) {\n  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {\n    return;\n  }\n  if (!window.navigator.mediaDevices) {\n    return;\n  }\n  window.navigator.mediaDevices.getDisplayMedia = function getDisplayMedia(constraints) {\n    if (!(constraints && constraints.video)) {\n      var err = new DOMException('getDisplayMedia without video ' + 'constraints is undefined');\n      err.name = 'NotFoundError';\n      // from https://heycam.github.io/webidl/#idl-DOMException-error-names\n      err.code = 8;\n      return Promise.reject(err);\n    }\n    if (constraints.video === true) {\n      constraints.video = { mediaSource: preferredMediaSource };\n    } else {\n      constraints.video.mediaSource = preferredMediaSource;\n    }\n    return window.navigator.mediaDevices.getUserMedia(constraints);\n  };\n}\n\n},{}],13:[function(require,module,exports){\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nexports.shimGetUserMedia = shimGetUserMedia;\n\nvar _utils = require('../utils');\n\nvar utils = _interopRequireWildcard(_utils);\n\nfunction _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }\n\nfunction shimGetUserMedia(window) {\n  var browserDetails = utils.detectBrowser(window);\n  var navigator = window && window.navigator;\n  var MediaStreamTrack = window && window.MediaStreamTrack;\n\n  navigator.getUserMedia = function (constraints, onSuccess, onError) {\n    // Replace Firefox 44+'s deprecation warning with unprefixed version.\n    utils.deprecated('navigator.getUserMedia', 'navigator.mediaDevices.getUserMedia');\n    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);\n  };\n\n  if (!(browserDetails.version > 55 && 'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {\n    var remap = function remap(obj, a, b) {\n      if (a in obj && !(b in obj)) {\n        obj[b] = obj[a];\n        delete obj[a];\n      }\n    };\n\n    var nativeGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);\n    navigator.mediaDevices.getUserMedia = function (c) {\n      if ((typeof c === 'undefined' ? 'undefined' : _typeof(c)) === 'object' && _typeof(c.audio) === 'object') {\n        c = JSON.parse(JSON.stringify(c));\n        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');\n        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');\n      }\n      return nativeGetUserMedia(c);\n    };\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {\n      var nativeGetSettings = MediaStreamTrack.prototype.getSettings;\n      MediaStreamTrack.prototype.getSettings = function () {\n        var obj = nativeGetSettings.apply(this, arguments);\n        remap(obj, 'mozAutoGainControl', 'autoGainControl');\n        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');\n        return obj;\n      };\n    }\n\n    if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {\n      var nativeApplyConstraints = MediaStreamTrack.prototype.applyConstraints;\n      MediaStreamTrack.prototype.applyConstraints = function (c) {\n        if (this.kind === 'audio' && (typeof c === 'undefined' ? 'undefined' : _typeof(c)) === 'object') {\n          c = JSON.parse(JSON.stringify(c));\n          remap(c, 'autoGainControl', 'mozAutoGainControl');\n          remap(c, 'noiseSuppression', 'mozNoiseSuppression');\n        }\n        return nativeApplyConstraints.apply(this, [c]);\n      };\n    }\n  }\n}\n\n},{\"../utils\":15}],14:[function(require,module,exports){\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nexports.shimLocalStreamsAPI = shimLocalStreamsAPI;\nexports.shimRemoteStreamsAPI = shimRemoteStreamsAPI;\nexports.shimCallbacksAPI = shimCallbacksAPI;\nexports.shimGetUserMedia = shimGetUserMedia;\nexports.shimConstraints = shimConstraints;\nexports.shimRTCIceServerUrls = shimRTCIceServerUrls;\nexports.shimTrackEventTransceiver = shimTrackEventTransceiver;\nexports.shimCreateOfferLegacy = shimCreateOfferLegacy;\n\nvar _utils = require('../utils');\n\nvar utils = _interopRequireWildcard(_utils);\n\nfunction _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }\n\nfunction shimLocalStreamsAPI(window) {\n  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      return this._localStreams;\n    };\n  }\n  if (!('addStream' in window.RTCPeerConnection.prototype)) {\n    var _addTrack = window.RTCPeerConnection.prototype.addTrack;\n    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {\n      var _this = this;\n\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      if (!this._localStreams.includes(stream)) {\n        this._localStreams.push(stream);\n      }\n      // Try to emulate Chrome's behaviour of adding in audio-video order.\n      // Safari orders by track id.\n      stream.getAudioTracks().forEach(function (track) {\n        return _addTrack.call(_this, track, stream);\n      });\n      stream.getVideoTracks().forEach(function (track) {\n        return _addTrack.call(_this, track, stream);\n      });\n    };\n\n    window.RTCPeerConnection.prototype.addTrack = function addTrack(track) {\n      var stream = arguments[1];\n      if (stream) {\n        if (!this._localStreams) {\n          this._localStreams = [stream];\n        } else if (!this._localStreams.includes(stream)) {\n          this._localStreams.push(stream);\n        }\n      }\n      return _addTrack.apply(this, arguments);\n    };\n  }\n  if (!('removeStream' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {\n      var _this2 = this;\n\n      if (!this._localStreams) {\n        this._localStreams = [];\n      }\n      var index = this._localStreams.indexOf(stream);\n      if (index === -1) {\n        return;\n      }\n      this._localStreams.splice(index, 1);\n      var tracks = stream.getTracks();\n      this.getSenders().forEach(function (sender) {\n        if (tracks.includes(sender.track)) {\n          _this2.removeTrack(sender);\n        }\n      });\n    };\n  }\n}\n\nfunction shimRemoteStreamsAPI(window) {\n  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {\n    window.RTCPeerConnection.prototype.getRemoteStreams = function getRemoteStreams() {\n      return this._remoteStreams ? this._remoteStreams : [];\n    };\n  }\n  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {\n    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {\n      get: function get() {\n        return this._onaddstream;\n      },\n      set: function set(f) {\n        var _this3 = this;\n\n        if (this._onaddstream) {\n          this.removeEventListener('addstream', this._onaddstream);\n          this.removeEventListener('track', this._onaddstreampoly);\n        }\n        this.addEventListener('addstream', this._onaddstream = f);\n        this.addEventListener('track', this._onaddstreampoly = function (e) {\n          e.streams.forEach(function (stream) {\n            if (!_this3._remoteStreams) {\n              _this3._remoteStreams = [];\n            }\n            if (_this3._remoteStreams.includes(stream)) {\n              return;\n            }\n            _this3._remoteStreams.push(stream);\n            var event = new Event('addstream');\n            event.stream = stream;\n            _this3.dispatchEvent(event);\n          });\n        });\n      }\n    });\n    var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;\n    window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {\n      var pc = this;\n      if (!this._onaddstreampoly) {\n        this.addEventListener('track', this._onaddstreampoly = function (e) {\n          e.streams.forEach(function (stream) {\n            if (!pc._remoteStreams) {\n              pc._remoteStreams = [];\n            }\n            if (pc._remoteStreams.indexOf(stream) >= 0) {\n              return;\n            }\n            pc._remoteStreams.push(stream);\n            var event = new Event('addstream');\n            event.stream = stream;\n            pc.dispatchEvent(event);\n          });\n        });\n      }\n      return origSetRemoteDescription.apply(pc, arguments);\n    };\n  }\n}\n\nfunction shimCallbacksAPI(window) {\n  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !window.RTCPeerConnection) {\n    return;\n  }\n  var prototype = window.RTCPeerConnection.prototype;\n  var origCreateOffer = prototype.createOffer;\n  var origCreateAnswer = prototype.createAnswer;\n  var setLocalDescription = prototype.setLocalDescription;\n  var setRemoteDescription = prototype.setRemoteDescription;\n  var addIceCandidate = prototype.addIceCandidate;\n\n  prototype.createOffer = function createOffer(successCallback, failureCallback) {\n    var options = arguments.length >= 2 ? arguments[2] : arguments[0];\n    var promise = origCreateOffer.apply(this, [options]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n\n  prototype.createAnswer = function createAnswer(successCallback, failureCallback) {\n    var options = arguments.length >= 2 ? arguments[2] : arguments[0];\n    var promise = origCreateAnswer.apply(this, [options]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n\n  var withCallback = function withCallback(description, successCallback, failureCallback) {\n    var promise = setLocalDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setLocalDescription = withCallback;\n\n  withCallback = function withCallback(description, successCallback, failureCallback) {\n    var promise = setRemoteDescription.apply(this, [description]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.setRemoteDescription = withCallback;\n\n  withCallback = function withCallback(candidate, successCallback, failureCallback) {\n    var promise = addIceCandidate.apply(this, [candidate]);\n    if (!failureCallback) {\n      return promise;\n    }\n    promise.then(successCallback, failureCallback);\n    return Promise.resolve();\n  };\n  prototype.addIceCandidate = withCallback;\n}\n\nfunction shimGetUserMedia(window) {\n  var navigator = window && window.navigator;\n\n  if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {\n    // shim not needed in Safari 12.1\n    var mediaDevices = navigator.mediaDevices;\n    var _getUserMedia = mediaDevices.getUserMedia.bind(mediaDevices);\n    navigator.mediaDevices.getUserMedia = function (constraints) {\n      return _getUserMedia(shimConstraints(constraints));\n    };\n  }\n\n  if (!navigator.getUserMedia && navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {\n    navigator.getUserMedia = function getUserMedia(constraints, cb, errcb) {\n      navigator.mediaDevices.getUserMedia(constraints).then(cb, errcb);\n    }.bind(navigator);\n  }\n}\n\nfunction shimConstraints(constraints) {\n  if (constraints && constraints.video !== undefined) {\n    return Object.assign({}, constraints, { video: utils.compactObject(constraints.video) });\n  }\n\n  return constraints;\n}\n\nfunction shimRTCIceServerUrls(window) {\n  // migrate from non-spec RTCIceServer.url to RTCIceServer.urls\n  var OrigPeerConnection = window.RTCPeerConnection;\n  window.RTCPeerConnection = function RTCPeerConnection(pcConfig, pcConstraints) {\n    if (pcConfig && pcConfig.iceServers) {\n      var newIceServers = [];\n      for (var i = 0; i < pcConfig.iceServers.length; i++) {\n        var server = pcConfig.iceServers[i];\n        if (!server.hasOwnProperty('urls') && server.hasOwnProperty('url')) {\n          utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');\n          server = JSON.parse(JSON.stringify(server));\n          server.urls = server.url;\n          delete server.url;\n          newIceServers.push(server);\n        } else {\n          newIceServers.push(pcConfig.iceServers[i]);\n        }\n      }\n      pcConfig.iceServers = newIceServers;\n    }\n    return new OrigPeerConnection(pcConfig, pcConstraints);\n  };\n  window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;\n  // wrap static methods. Currently just generateCertificate.\n  if ('generateCertificate' in window.RTCPeerConnection) {\n    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n      get: function get() {\n        return OrigPeerConnection.generateCertificate;\n      }\n    });\n  }\n}\n\nfunction shimTrackEventTransceiver(window) {\n  // Add event.transceiver member over deprecated event.receiver\n  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCTrackEvent && 'receiver' in window.RTCTrackEvent.prototype && !('transceiver' in window.RTCTrackEvent.prototype)) {\n    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {\n      get: function get() {\n        return { receiver: this.receiver };\n      }\n    });\n  }\n}\n\nfunction shimCreateOfferLegacy(window) {\n  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;\n  window.RTCPeerConnection.prototype.createOffer = function createOffer(offerOptions) {\n    if (offerOptions) {\n      if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {\n        // support bit values\n        offerOptions.offerToReceiveAudio = !!offerOptions.offerToReceiveAudio;\n      }\n      var audioTransceiver = this.getTransceivers().find(function (transceiver) {\n        return transceiver.receiver.track.kind === 'audio';\n      });\n      if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {\n        if (audioTransceiver.direction === 'sendrecv') {\n          if (audioTransceiver.setDirection) {\n            audioTransceiver.setDirection('sendonly');\n          } else {\n            audioTransceiver.direction = 'sendonly';\n          }\n        } else if (audioTransceiver.direction === 'recvonly') {\n          if (audioTransceiver.setDirection) {\n            audioTransceiver.setDirection('inactive');\n          } else {\n            audioTransceiver.direction = 'inactive';\n          }\n        }\n      } else if (offerOptions.offerToReceiveAudio === true && !audioTransceiver) {\n        this.addTransceiver('audio');\n      }\n\n      if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {\n        // support bit values\n        offerOptions.offerToReceiveVideo = !!offerOptions.offerToReceiveVideo;\n      }\n      var videoTransceiver = this.getTransceivers().find(function (transceiver) {\n        return transceiver.receiver.track.kind === 'video';\n      });\n      if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {\n        if (videoTransceiver.direction === 'sendrecv') {\n          if (videoTransceiver.setDirection) {\n            videoTransceiver.setDirection('sendonly');\n          } else {\n            videoTransceiver.direction = 'sendonly';\n          }\n        } else if (videoTransceiver.direction === 'recvonly') {\n          if (videoTransceiver.setDirection) {\n            videoTransceiver.setDirection('inactive');\n          } else {\n            videoTransceiver.direction = 'inactive';\n          }\n        }\n      } else if (offerOptions.offerToReceiveVideo === true && !videoTransceiver) {\n        this.addTransceiver('video');\n      }\n    }\n    return origCreateOffer.apply(this, arguments);\n  };\n}\n\n},{\"../utils\":15}],15:[function(require,module,exports){\n/*\n *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n/* eslint-env node */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nexports.extractVersion = extractVersion;\nexports.wrapPeerConnectionEvent = wrapPeerConnectionEvent;\nexports.disableLog = disableLog;\nexports.disableWarnings = disableWarnings;\nexports.log = log;\nexports.deprecated = deprecated;\nexports.detectBrowser = detectBrowser;\nexports.compactObject = compactObject;\nexports.walkStats = walkStats;\nexports.filterStats = filterStats;\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar logDisabled_ = true;\nvar deprecationWarnings_ = true;\n\n/**\n * Extract browser version out of the provided user agent string.\n *\n * @param {!string} uastring userAgent string.\n * @param {!string} expr Regular expression used as match criteria.\n * @param {!number} pos position in the version string to be returned.\n * @return {!number} browser version.\n */\nfunction extractVersion(uastring, expr, pos) {\n  var match = uastring.match(expr);\n  return match && match.length >= pos && parseInt(match[pos], 10);\n}\n\n// Wraps the peerconnection event eventNameToWrap in a function\n// which returns the modified event object (or false to prevent\n// the event).\nfunction wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {\n  if (!window.RTCPeerConnection) {\n    return;\n  }\n  var proto = window.RTCPeerConnection.prototype;\n  var nativeAddEventListener = proto.addEventListener;\n  proto.addEventListener = function (nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap) {\n      return nativeAddEventListener.apply(this, arguments);\n    }\n    var wrappedCallback = function wrappedCallback(e) {\n      var modifiedEvent = wrapper(e);\n      if (modifiedEvent) {\n        cb(modifiedEvent);\n      }\n    };\n    this._eventMap = this._eventMap || {};\n    this._eventMap[cb] = wrappedCallback;\n    return nativeAddEventListener.apply(this, [nativeEventName, wrappedCallback]);\n  };\n\n  var nativeRemoveEventListener = proto.removeEventListener;\n  proto.removeEventListener = function (nativeEventName, cb) {\n    if (nativeEventName !== eventNameToWrap || !this._eventMap || !this._eventMap[cb]) {\n      return nativeRemoveEventListener.apply(this, arguments);\n    }\n    var unwrappedCb = this._eventMap[cb];\n    delete this._eventMap[cb];\n    return nativeRemoveEventListener.apply(this, [nativeEventName, unwrappedCb]);\n  };\n\n  Object.defineProperty(proto, 'on' + eventNameToWrap, {\n    get: function get() {\n      return this['_on' + eventNameToWrap];\n    },\n    set: function set(cb) {\n      if (this['_on' + eventNameToWrap]) {\n        this.removeEventListener(eventNameToWrap, this['_on' + eventNameToWrap]);\n        delete this['_on' + eventNameToWrap];\n      }\n      if (cb) {\n        this.addEventListener(eventNameToWrap, this['_on' + eventNameToWrap] = cb);\n      }\n    },\n\n    enumerable: true,\n    configurable: true\n  });\n}\n\nfunction disableLog(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + (typeof bool === 'undefined' ? 'undefined' : _typeof(bool)) + '. Please use a boolean.');\n  }\n  logDisabled_ = bool;\n  return bool ? 'adapter.js logging disabled' : 'adapter.js logging enabled';\n}\n\n/**\n * Disable or enable deprecation warnings\n * @param {!boolean} bool set to true to disable warnings.\n */\nfunction disableWarnings(bool) {\n  if (typeof bool !== 'boolean') {\n    return new Error('Argument type: ' + (typeof bool === 'undefined' ? 'undefined' : _typeof(bool)) + '. Please use a boolean.');\n  }\n  deprecationWarnings_ = !bool;\n  return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');\n}\n\nfunction log() {\n  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object') {\n    if (logDisabled_) {\n      return;\n    }\n    if (typeof console !== 'undefined' && typeof console.log === 'function') {\n      console.log.apply(console, arguments);\n    }\n  }\n}\n\n/**\n * Shows a deprecation warning suggesting the modern and spec-compatible API.\n */\nfunction deprecated(oldMethod, newMethod) {\n  if (!deprecationWarnings_) {\n    return;\n  }\n  console.warn(oldMethod + ' is deprecated, please use ' + newMethod + ' instead.');\n}\n\n/**\n * Browser detector.\n *\n * @return {object} result containing browser and version\n *     properties.\n */\nfunction detectBrowser(window) {\n  var navigator = window.navigator;\n\n  // Returned result object.\n\n  var result = { browser: null, version: null };\n\n  // Fail early if it's not a browser\n  if (typeof window === 'undefined' || !window.navigator) {\n    result.browser = 'Not a browser.';\n    return result;\n  }\n\n  if (navigator.mozGetUserMedia) {\n    // Firefox.\n    result.browser = 'firefox';\n    result.version = extractVersion(navigator.userAgent, /Firefox\\/(\\d+)\\./, 1);\n  } else if (navigator.webkitGetUserMedia || window.isSecureContext === false && window.webkitRTCPeerConnection && !window.RTCIceGatherer) {\n    // Chrome, Chromium, Webview, Opera.\n    // Version matches Chrome/WebRTC version.\n    // Chrome 74 removed webkitGetUserMedia on http as well so we need the\n    // more complicated fallback to webkitRTCPeerConnection.\n    result.browser = 'chrome';\n    result.version = extractVersion(navigator.userAgent, /Chrom(e|ium)\\/(\\d+)\\./, 2);\n  } else if (navigator.mediaDevices && navigator.userAgent.match(/Edge\\/(\\d+).(\\d+)$/)) {\n    // Edge.\n    result.browser = 'edge';\n    result.version = extractVersion(navigator.userAgent, /Edge\\/(\\d+).(\\d+)$/, 2);\n  } else if (window.RTCPeerConnection && navigator.userAgent.match(/AppleWebKit\\/(\\d+)\\./)) {\n    // Safari.\n    result.browser = 'safari';\n    result.version = extractVersion(navigator.userAgent, /AppleWebKit\\/(\\d+)\\./, 1);\n    result.supportsUnifiedPlan = window.RTCRtpTransceiver && 'currentDirection' in window.RTCRtpTransceiver.prototype;\n  } else {\n    // Default fallthrough: not supported.\n    result.browser = 'Not a supported browser.';\n    return result;\n  }\n\n  return result;\n}\n\n/**\n * Checks if something is an object.\n *\n * @param {*} val The something you want to check.\n * @return true if val is an object, false otherwise.\n */\nfunction isObject(val) {\n  return Object.prototype.toString.call(val) === '[object Object]';\n}\n\n/**\n * Remove all empty objects and undefined values\n * from a nested object -- an enhanced and vanilla version\n * of Lodash's `compact`.\n */\nfunction compactObject(data) {\n  if (!isObject(data)) {\n    return data;\n  }\n\n  return Object.keys(data).reduce(function (accumulator, key) {\n    var isObj = isObject(data[key]);\n    var value = isObj ? compactObject(data[key]) : data[key];\n    var isEmptyObject = isObj && !Object.keys(value).length;\n    if (value === undefined || isEmptyObject) {\n      return accumulator;\n    }\n    return Object.assign(accumulator, _defineProperty({}, key, value));\n  }, {});\n}\n\n/* iterates the stats graph recursively. */\nfunction walkStats(stats, base, resultSet) {\n  if (!base || resultSet.has(base.id)) {\n    return;\n  }\n  resultSet.set(base.id, base);\n  Object.keys(base).forEach(function (name) {\n    if (name.endsWith('Id')) {\n      walkStats(stats, stats.get(base[name]), resultSet);\n    } else if (name.endsWith('Ids')) {\n      base[name].forEach(function (id) {\n        walkStats(stats, stats.get(id), resultSet);\n      });\n    }\n  });\n}\n\n/* filter getStats for a sender/receiver track. */\nfunction filterStats(result, track, outbound) {\n  var streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';\n  var filteredResult = new Map();\n  if (track === null) {\n    return filteredResult;\n  }\n  var trackStats = [];\n  result.forEach(function (value) {\n    if (value.type === 'track' && value.trackIdentifier === track.id) {\n      trackStats.push(value);\n    }\n  });\n  trackStats.forEach(function (trackStat) {\n    result.forEach(function (stats) {\n      if (stats.type === streamStatsType && stats.trackId === trackStat.id) {\n        walkStats(result, stats, filteredResult);\n      }\n    });\n  });\n  return filteredResult;\n}\n\n},{}],16:[function(require,module,exports){\n/*\n *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.\n *\n *  Use of this source code is governed by a BSD-style license\n *  that can be found in the LICENSE file in the root of the source\n *  tree.\n */\n /* eslint-env node */\n'use strict';\n\nvar SDPUtils = require('sdp');\n\nfunction fixStatsType(stat) {\n  return {\n    inboundrtp: 'inbound-rtp',\n    outboundrtp: 'outbound-rtp',\n    candidatepair: 'candidate-pair',\n    localcandidate: 'local-candidate',\n    remotecandidate: 'remote-candidate'\n  }[stat.type] || stat.type;\n}\n\nfunction writeMediaSection(transceiver, caps, type, stream, dtlsRole) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n      transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n      transceiver.dtlsTransport.getLocalParameters(),\n      type === 'offer' ? 'actpass' : dtlsRole || 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    var trackId = transceiver.rtpSender._initialTrackId ||\n        transceiver.rtpSender.track.id;\n    transceiver.rtpSender._initialTrackId = trackId;\n    // spec.\n    var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +\n        trackId + '\\r\\n';\n    sdp += 'a=' + msid;\n    // for Chrome. Legacy should no longer be required.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n\n    // RTX\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n}\n\n// Edge does not like\n// 1) stun: filtered after 14393 unless ?transport=udp is present\n// 2) turn: that does not have all of turn:host:port?transport=udp\n// 3) turn: with ipv6 addresses\n// 4) turn: occurring muliple times\nfunction filterIceServers(iceServers, edgeVersion) {\n  var hasTurn = false;\n  iceServers = JSON.parse(JSON.stringify(iceServers));\n  return iceServers.filter(function(server) {\n    if (server && (server.urls || server.url)) {\n      var urls = server.urls || server.url;\n      if (server.url && !server.urls) {\n        console.warn('RTCIceServer.url is deprecated! Use urls instead.');\n      }\n      var isString = typeof urls === 'string';\n      if (isString) {\n        urls = [urls];\n      }\n      urls = urls.filter(function(url) {\n        var validTurn = url.indexOf('turn:') === 0 &&\n            url.indexOf('transport=udp') !== -1 &&\n            url.indexOf('turn:[') === -1 &&\n            !hasTurn;\n\n        if (validTurn) {\n          hasTurn = true;\n          return true;\n        }\n        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&\n            url.indexOf('?transport=udp') === -1;\n      });\n\n      delete server.url;\n      server.urls = isString ? urls[0] : urls;\n      return !!urls.length;\n    }\n  });\n}\n\n// Determines the intersection of local and remote capabilities.\nfunction getCommonCapabilities(localCapabilities, remoteCapabilities) {\n  var commonCapabilities = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: []\n  };\n\n  var findCodecByPayloadType = function(pt, codecs) {\n    pt = parseInt(pt, 10);\n    for (var i = 0; i < codecs.length; i++) {\n      if (codecs[i].payloadType === pt ||\n          codecs[i].preferredPayloadType === pt) {\n        return codecs[i];\n      }\n    }\n  };\n\n  var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {\n    var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);\n    var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);\n    return lCodec && rCodec &&\n        lCodec.name.toLowerCase() === rCodec.name.toLowerCase();\n  };\n\n  localCapabilities.codecs.forEach(function(lCodec) {\n    for (var i = 0; i < remoteCapabilities.codecs.length; i++) {\n      var rCodec = remoteCapabilities.codecs[i];\n      if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&\n          lCodec.clockRate === rCodec.clockRate) {\n        if (lCodec.name.toLowerCase() === 'rtx' &&\n            lCodec.parameters && rCodec.parameters.apt) {\n          // for RTX we need to find the local rtx that has a apt\n          // which points to the same local codec as the remote one.\n          if (!rtxCapabilityMatches(lCodec, rCodec,\n              localCapabilities.codecs, remoteCapabilities.codecs)) {\n            continue;\n          }\n        }\n        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy\n        // number of channels is the highest common number of channels\n        rCodec.numChannels = Math.min(lCodec.numChannels,\n            rCodec.numChannels);\n        // push rCodec so we reply with offerer payload type\n        commonCapabilities.codecs.push(rCodec);\n\n        // determine common feedback mechanisms\n        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {\n          for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {\n            if (lCodec.rtcpFeedback[j].type === fb.type &&\n                lCodec.rtcpFeedback[j].parameter === fb.parameter) {\n              return true;\n            }\n          }\n          return false;\n        });\n        // FIXME: also need to determine .parameters\n        //  see https://github.com/openpeer/ortc/issues/569\n        break;\n      }\n    }\n  });\n\n  localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {\n    for (var i = 0; i < remoteCapabilities.headerExtensions.length;\n         i++) {\n      var rHeaderExtension = remoteCapabilities.headerExtensions[i];\n      if (lHeaderExtension.uri === rHeaderExtension.uri) {\n        commonCapabilities.headerExtensions.push(rHeaderExtension);\n        break;\n      }\n    }\n  });\n\n  // FIXME: fecMechanisms\n  return commonCapabilities;\n}\n\n// is action=setLocalDescription with type allowed in signalingState\nfunction isActionAllowedInSignalingState(action, type, signalingState) {\n  return {\n    offer: {\n      setLocalDescription: ['stable', 'have-local-offer'],\n      setRemoteDescription: ['stable', 'have-remote-offer']\n    },\n    answer: {\n      setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],\n      setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']\n    }\n  }[type][action].indexOf(signalingState) !== -1;\n}\n\nfunction maybeAddCandidate(iceTransport, candidate) {\n  // Edge's internal representation adds some fields therefore\n  // not all fieldѕ are taken into account.\n  var alreadyAdded = iceTransport.getRemoteCandidates()\n      .find(function(remoteCandidate) {\n        return candidate.foundation === remoteCandidate.foundation &&\n            candidate.ip === remoteCandidate.ip &&\n            candidate.port === remoteCandidate.port &&\n            candidate.priority === remoteCandidate.priority &&\n            candidate.protocol === remoteCandidate.protocol &&\n            candidate.type === remoteCandidate.type;\n      });\n  if (!alreadyAdded) {\n    iceTransport.addRemoteCandidate(candidate);\n  }\n  return !alreadyAdded;\n}\n\n\nfunction makeError(name, description) {\n  var e = new Error(description);\n  e.name = name;\n  // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names\n  e.code = {\n    NotSupportedError: 9,\n    InvalidStateError: 11,\n    InvalidAccessError: 15,\n    TypeError: undefined,\n    OperationError: undefined\n  }[name];\n  return e;\n}\n\nmodule.exports = function(window, edgeVersion) {\n  // https://w3c.github.io/mediacapture-main/#mediastream\n  // Helper function to add the track to the stream and\n  // dispatch the event ourselves.\n  function addTrackToStreamAndFireEvent(track, stream) {\n    stream.addTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack',\n        {track: track}));\n  }\n\n  function removeTrackFromStreamAndFireEvent(track, stream) {\n    stream.removeTrack(track);\n    stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack',\n        {track: track}));\n  }\n\n  function fireAddTrack(pc, track, receiver, streams) {\n    var trackEvent = new Event('track');\n    trackEvent.track = track;\n    trackEvent.receiver = receiver;\n    trackEvent.transceiver = {receiver: receiver};\n    trackEvent.streams = streams;\n    window.setTimeout(function() {\n      pc._dispatchEvent('track', trackEvent);\n    });\n  }\n\n  var RTCPeerConnection = function(config) {\n    var pc = this;\n\n    var _eventTarget = document.createDocumentFragment();\n    ['addEventListener', 'removeEventListener', 'dispatchEvent']\n        .forEach(function(method) {\n          pc[method] = _eventTarget[method].bind(_eventTarget);\n        });\n\n    this.canTrickleIceCandidates = null;\n\n    this.needNegotiation = false;\n\n    this.localStreams = [];\n    this.remoteStreams = [];\n\n    this._localDescription = null;\n    this._remoteDescription = null;\n\n    this.signalingState = 'stable';\n    this.iceConnectionState = 'new';\n    this.connectionState = 'new';\n    this.iceGatheringState = 'new';\n\n    config = JSON.parse(JSON.stringify(config || {}));\n\n    this.usingBundle = config.bundlePolicy === 'max-bundle';\n    if (config.rtcpMuxPolicy === 'negotiate') {\n      throw(makeError('NotSupportedError',\n          'rtcpMuxPolicy \\'negotiate\\' is not supported'));\n    } else if (!config.rtcpMuxPolicy) {\n      config.rtcpMuxPolicy = 'require';\n    }\n\n    switch (config.iceTransportPolicy) {\n      case 'all':\n      case 'relay':\n        break;\n      default:\n        config.iceTransportPolicy = 'all';\n        break;\n    }\n\n    switch (config.bundlePolicy) {\n      case 'balanced':\n      case 'max-compat':\n      case 'max-bundle':\n        break;\n      default:\n        config.bundlePolicy = 'balanced';\n        break;\n    }\n\n    config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);\n\n    this._iceGatherers = [];\n    if (config.iceCandidatePoolSize) {\n      for (var i = config.iceCandidatePoolSize; i > 0; i--) {\n        this._iceGatherers.push(new window.RTCIceGatherer({\n          iceServers: config.iceServers,\n          gatherPolicy: config.iceTransportPolicy\n        }));\n      }\n    } else {\n      config.iceCandidatePoolSize = 0;\n    }\n\n    this._config = config;\n\n    // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...\n    // everything that is needed to describe a SDP m-line.\n    this.transceivers = [];\n\n    this._sdpSessionId = SDPUtils.generateSessionId();\n    this._sdpSessionVersion = 0;\n\n    this._dtlsRole = undefined; // role for a=setup to use in answers.\n\n    this._isClosed = false;\n  };\n\n  Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {\n    configurable: true,\n    get: function() {\n      return this._localDescription;\n    }\n  });\n  Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {\n    configurable: true,\n    get: function() {\n      return this._remoteDescription;\n    }\n  });\n\n  // set up event handlers on prototype\n  RTCPeerConnection.prototype.onicecandidate = null;\n  RTCPeerConnection.prototype.onaddstream = null;\n  RTCPeerConnection.prototype.ontrack = null;\n  RTCPeerConnection.prototype.onremovestream = null;\n  RTCPeerConnection.prototype.onsignalingstatechange = null;\n  RTCPeerConnection.prototype.oniceconnectionstatechange = null;\n  RTCPeerConnection.prototype.onconnectionstatechange = null;\n  RTCPeerConnection.prototype.onicegatheringstatechange = null;\n  RTCPeerConnection.prototype.onnegotiationneeded = null;\n  RTCPeerConnection.prototype.ondatachannel = null;\n\n  RTCPeerConnection.prototype._dispatchEvent = function(name, event) {\n    if (this._isClosed) {\n      return;\n    }\n    this.dispatchEvent(event);\n    if (typeof this['on' + name] === 'function') {\n      this['on' + name](event);\n    }\n  };\n\n  RTCPeerConnection.prototype._emitGatheringStateChange = function() {\n    var event = new Event('icegatheringstatechange');\n    this._dispatchEvent('icegatheringstatechange', event);\n  };\n\n  RTCPeerConnection.prototype.getConfiguration = function() {\n    return this._config;\n  };\n\n  RTCPeerConnection.prototype.getLocalStreams = function() {\n    return this.localStreams;\n  };\n\n  RTCPeerConnection.prototype.getRemoteStreams = function() {\n    return this.remoteStreams;\n  };\n\n  // internal helper to create a transceiver object.\n  // (which is not yet the same as the WebRTC 1.0 transceiver)\n  RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {\n    var hasBundleTransport = this.transceivers.length > 0;\n    var transceiver = {\n      track: null,\n      iceGatherer: null,\n      iceTransport: null,\n      dtlsTransport: null,\n      localCapabilities: null,\n      remoteCapabilities: null,\n      rtpSender: null,\n      rtpReceiver: null,\n      kind: kind,\n      mid: null,\n      sendEncodingParameters: null,\n      recvEncodingParameters: null,\n      stream: null,\n      associatedRemoteMediaStreams: [],\n      wantReceive: true\n    };\n    if (this.usingBundle && hasBundleTransport) {\n      transceiver.iceTransport = this.transceivers[0].iceTransport;\n      transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;\n    } else {\n      var transports = this._createIceAndDtlsTransports();\n      transceiver.iceTransport = transports.iceTransport;\n      transceiver.dtlsTransport = transports.dtlsTransport;\n    }\n    if (!doNotAdd) {\n      this.transceivers.push(transceiver);\n    }\n    return transceiver;\n  };\n\n  RTCPeerConnection.prototype.addTrack = function(track, stream) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call addTrack on a closed peerconnection.');\n    }\n\n    var alreadyExists = this.transceivers.find(function(s) {\n      return s.track === track;\n    });\n\n    if (alreadyExists) {\n      throw makeError('InvalidAccessError', 'Track already exists.');\n    }\n\n    var transceiver;\n    for (var i = 0; i < this.transceivers.length; i++) {\n      if (!this.transceivers[i].track &&\n          this.transceivers[i].kind === track.kind) {\n        transceiver = this.transceivers[i];\n      }\n    }\n    if (!transceiver) {\n      transceiver = this._createTransceiver(track.kind);\n    }\n\n    this._maybeFireNegotiationNeeded();\n\n    if (this.localStreams.indexOf(stream) === -1) {\n      this.localStreams.push(stream);\n    }\n\n    transceiver.track = track;\n    transceiver.stream = stream;\n    transceiver.rtpSender = new window.RTCRtpSender(track,\n        transceiver.dtlsTransport);\n    return transceiver.rtpSender;\n  };\n\n  RTCPeerConnection.prototype.addStream = function(stream) {\n    var pc = this;\n    if (edgeVersion >= 15025) {\n      stream.getTracks().forEach(function(track) {\n        pc.addTrack(track, stream);\n      });\n    } else {\n      // Clone is necessary for local demos mostly, attaching directly\n      // to two different senders does not work (build 10547).\n      // Fixed in 15025 (or earlier)\n      var clonedStream = stream.clone();\n      stream.getTracks().forEach(function(track, idx) {\n        var clonedTrack = clonedStream.getTracks()[idx];\n        track.addEventListener('enabled', function(event) {\n          clonedTrack.enabled = event.enabled;\n        });\n      });\n      clonedStream.getTracks().forEach(function(track) {\n        pc.addTrack(track, clonedStream);\n      });\n    }\n  };\n\n  RTCPeerConnection.prototype.removeTrack = function(sender) {\n    if (this._isClosed) {\n      throw makeError('InvalidStateError',\n          'Attempted to call removeTrack on a closed peerconnection.');\n    }\n\n    if (!(sender instanceof window.RTCRtpSender)) {\n      throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' +\n          'does not implement interface RTCRtpSender.');\n    }\n\n    var transceiver = this.transceivers.find(function(t) {\n      return t.rtpSender === sender;\n    });\n\n    if (!transceiver) {\n      throw makeError('InvalidAccessError',\n          'Sender was not created by this connection.');\n    }\n    var stream = transceiver.stream;\n\n    transceiver.rtpSender.stop();\n    transceiver.rtpSender = null;\n    transceiver.track = null;\n    transceiver.stream = null;\n\n    // remove the stream from the set of local streams\n    var localStreams = this.transceivers.map(function(t) {\n      return t.stream;\n    });\n    if (localStreams.indexOf(stream) === -1 &&\n        this.localStreams.indexOf(stream) > -1) {\n      this.localStreams.splice(this.localStreams.indexOf(stream), 1);\n    }\n\n    this._maybeFireNegotiationNeeded();\n  };\n\n  RTCPeerConnection.prototype.removeStream = function(stream) {\n    var pc = this;\n    stream.getTracks().forEach(function(track) {\n      var sender = pc.getSenders().find(function(s) {\n        return s.track === track;\n      });\n      if (sender) {\n        pc.removeTrack(sender);\n      }\n    });\n  };\n\n  RTCPeerConnection.prototype.getSenders = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpSender;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpSender;\n    });\n  };\n\n  RTCPeerConnection.prototype.getReceivers = function() {\n    return this.transceivers.filter(function(transceiver) {\n      return !!transceiver.rtpReceiver;\n    })\n    .map(function(transceiver) {\n      return transceiver.rtpReceiver;\n    });\n  };\n\n\n  RTCPeerConnection.prototype._createIceGatherer = function(sdpMLineIndex,\n      usingBundle) {\n    var pc = this;\n    if (usingBundle && sdpMLineIndex > 0) {\n      return this.transceivers[0].iceGatherer;\n    } else if (this._iceGatherers.length) {\n      return this._iceGatherers.shift();\n    }\n    var iceGatherer = new window.RTCIceGatherer({\n      iceServers: this._config.iceServers,\n      gatherPolicy: this._config.iceTransportPolicy\n    });\n    Object.defineProperty(iceGatherer, 'state',\n        {value: 'new', writable: true}\n    );\n\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];\n    this.transceivers[sdpMLineIndex].bufferCandidates = function(event) {\n      var end = !event.candidate || Object.keys(event.candidate).length === 0;\n      // polyfill since RTCIceGatherer.state is not implemented in\n      // Edge 10547 yet.\n      iceGatherer.state = end ? 'completed' : 'gathering';\n      if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {\n        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);\n      }\n    };\n    iceGatherer.addEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    return iceGatherer;\n  };\n\n  // start gathering from an RTCIceGatherer.\n  RTCPeerConnection.prototype._gather = function(mid, sdpMLineIndex) {\n    var pc = this;\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer.onlocalcandidate) {\n      return;\n    }\n    var bufferedCandidateEvents =\n      this.transceivers[sdpMLineIndex].bufferedCandidateEvents;\n    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;\n    iceGatherer.removeEventListener('localcandidate',\n      this.transceivers[sdpMLineIndex].bufferCandidates);\n    iceGatherer.onlocalcandidate = function(evt) {\n      if (pc.usingBundle && sdpMLineIndex > 0) {\n        // if we know that we use bundle we can drop candidates with\n        // ѕdpMLineIndex > 0. If we don't do this then our state gets\n        // confused since we dispose the extra ice gatherer.\n        return;\n      }\n      var event = new Event('icecandidate');\n      event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};\n\n      var cand = evt.candidate;\n      // Edge emits an empty object for RTCIceCandidateComplete‥\n      var end = !cand || Object.keys(cand).length === 0;\n      if (end) {\n        // polyfill since RTCIceGatherer.state is not implemented in\n        // Edge 10547 yet.\n        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {\n          iceGatherer.state = 'completed';\n        }\n      } else {\n        if (iceGatherer.state === 'new') {\n          iceGatherer.state = 'gathering';\n        }\n        // RTCIceCandidate doesn't have a component, needs to be added\n        cand.component = 1;\n        // also the usernameFragment. TODO: update SDP to take both variants.\n        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;\n\n        var serializedCandidate = SDPUtils.writeCandidate(cand);\n        event.candidate = Object.assign(event.candidate,\n            SDPUtils.parseCandidate(serializedCandidate));\n\n        event.candidate.candidate = serializedCandidate;\n        event.candidate.toJSON = function() {\n          return {\n            candidate: event.candidate.candidate,\n            sdpMid: event.candidate.sdpMid,\n            sdpMLineIndex: event.candidate.sdpMLineIndex,\n            usernameFragment: event.candidate.usernameFragment\n          };\n        };\n      }\n\n      // update local description.\n      var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);\n      if (!end) {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=' + event.candidate.candidate + '\\r\\n';\n      } else {\n        sections[event.candidate.sdpMLineIndex] +=\n            'a=end-of-candidates\\r\\n';\n      }\n      pc._localDescription.sdp =\n          SDPUtils.getDescription(pc._localDescription.sdp) +\n          sections.join('');\n      var complete = pc.transceivers.every(function(transceiver) {\n        return transceiver.iceGatherer &&\n            transceiver.iceGatherer.state === 'completed';\n      });\n\n      if (pc.iceGatheringState !== 'gathering') {\n        pc.iceGatheringState = 'gathering';\n        pc._emitGatheringStateChange();\n      }\n\n      // Emit candidate. Also emit null candidate when all gatherers are\n      // complete.\n      if (!end) {\n        pc._dispatchEvent('icecandidate', event);\n      }\n      if (complete) {\n        pc._dispatchEvent('icecandidate', new Event('icecandidate'));\n        pc.iceGatheringState = 'complete';\n        pc._emitGatheringStateChange();\n      }\n    };\n\n    // emit already gathered candidates.\n    window.setTimeout(function() {\n      bufferedCandidateEvents.forEach(function(e) {\n        iceGatherer.onlocalcandidate(e);\n      });\n    }, 0);\n  };\n\n  // Create ICE transport and DTLS transport.\n  RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {\n    var pc = this;\n    var iceTransport = new window.RTCIceTransport(null);\n    iceTransport.onicestatechange = function() {\n      pc._updateIceConnectionState();\n      pc._updateConnectionState();\n    };\n\n    var dtlsTransport = new window.RTCDtlsTransport(iceTransport);\n    dtlsTransport.ondtlsstatechange = function() {\n      pc._updateConnectionState();\n    };\n    dtlsTransport.onerror = function() {\n      // onerror does not set state to failed by itself.\n      Object.defineProperty(dtlsTransport, 'state',\n          {value: 'failed', writable: true});\n      pc._updateConnectionState();\n    };\n\n    return {\n      iceTransport: iceTransport,\n      dtlsTransport: dtlsTransport\n    };\n  };\n\n  // Destroy ICE gatherer, ICE transport and DTLS transport.\n  // Without triggering the callbacks.\n  RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(\n      sdpMLineIndex) {\n    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;\n    if (iceGatherer) {\n      delete iceGatherer.onlocalcandidate;\n      delete this.transceivers[sdpMLineIndex].iceGatherer;\n    }\n    var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;\n    if (iceTransport) {\n      delete iceTransport.onicestatechange;\n      delete this.transceivers[sdpMLineIndex].iceTransport;\n    }\n    var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;\n    if (dtlsTransport) {\n      delete dtlsTransport.ondtlsstatechange;\n      delete dtlsTransport.onerror;\n      delete this.transceivers[sdpMLineIndex].dtlsTransport;\n    }\n  };\n\n  // Start the RTP Sender and Receiver for a transceiver.\n  RTCPeerConnection.prototype._transceive = function(transceiver,\n      send, recv) {\n    var params = getCommonCapabilities(transceiver.localCapabilities,\n        transceiver.remoteCapabilities);\n    if (send && transceiver.rtpSender) {\n      params.encodings = transceiver.sendEncodingParameters;\n      params.rtcp = {\n        cname: SDPUtils.localCName,\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.recvEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpSender.send(params);\n    }\n    if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {\n      // remove RTX field in Edge 14942\n      if (transceiver.kind === 'video'\n          && transceiver.recvEncodingParameters\n          && edgeVersion < 15019) {\n        transceiver.recvEncodingParameters.forEach(function(p) {\n          delete p.rtx;\n        });\n      }\n      if (transceiver.recvEncodingParameters.length) {\n        params.encodings = transceiver.recvEncodingParameters;\n      } else {\n        params.encodings = [{}];\n      }\n      params.rtcp = {\n        compound: transceiver.rtcpParameters.compound\n      };\n      if (transceiver.rtcpParameters.cname) {\n        params.rtcp.cname = transceiver.rtcpParameters.cname;\n      }\n      if (transceiver.sendEncodingParameters.length) {\n        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;\n      }\n      transceiver.rtpReceiver.receive(params);\n    }\n  };\n\n  RTCPeerConnection.prototype.setLocalDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setLocalDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set local ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var sections;\n    var sessionpart;\n    if (description.type === 'offer') {\n      // VERY limited support for SDP munging. Limited to:\n      // * changing the order of codecs\n      sections = SDPUtils.splitSections(description.sdp);\n      sessionpart = sections.shift();\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var caps = SDPUtils.parseRtpParameters(mediaSection);\n        pc.transceivers[sdpMLineIndex].localCapabilities = caps;\n      });\n\n      pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n        pc._gather(transceiver.mid, sdpMLineIndex);\n      });\n    } else if (description.type === 'answer') {\n      sections = SDPUtils.splitSections(pc._remoteDescription.sdp);\n      sessionpart = sections.shift();\n      var isIceLite = SDPUtils.matchPrefix(sessionpart,\n          'a=ice-lite').length > 0;\n      sections.forEach(function(mediaSection, sdpMLineIndex) {\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        var iceGatherer = transceiver.iceGatherer;\n        var iceTransport = transceiver.iceTransport;\n        var dtlsTransport = transceiver.dtlsTransport;\n        var localCapabilities = transceiver.localCapabilities;\n        var remoteCapabilities = transceiver.remoteCapabilities;\n\n        // treat bundle-only as not-rejected.\n        var rejected = SDPUtils.isRejected(mediaSection) &&\n            SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n\n        if (!rejected && !transceiver.rejected) {\n          var remoteIceParameters = SDPUtils.getIceParameters(\n              mediaSection, sessionpart);\n          var remoteDtlsParameters = SDPUtils.getDtlsParameters(\n              mediaSection, sessionpart);\n          if (isIceLite) {\n            remoteDtlsParameters.role = 'server';\n          }\n\n          if (!pc.usingBundle || sdpMLineIndex === 0) {\n            pc._gather(transceiver.mid, sdpMLineIndex);\n            if (iceTransport.state === 'new') {\n              iceTransport.start(iceGatherer, remoteIceParameters,\n                  isIceLite ? 'controlling' : 'controlled');\n            }\n            if (dtlsTransport.state === 'new') {\n              dtlsTransport.start(remoteDtlsParameters);\n            }\n          }\n\n          // Calculate intersection of capabilities.\n          var params = getCommonCapabilities(localCapabilities,\n              remoteCapabilities);\n\n          // Start the RTCRtpSender. The RTCRtpReceiver for this\n          // transceiver has already been started in setRemoteDescription.\n          pc._transceive(transceiver,\n              params.codecs.length > 0,\n              false);\n        }\n      });\n    }\n\n    pc._localDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-local-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.setRemoteDescription = function(description) {\n    var pc = this;\n\n    // Note: pranswer is not supported.\n    if (['offer', 'answer'].indexOf(description.type) === -1) {\n      return Promise.reject(makeError('TypeError',\n          'Unsupported type \"' + description.type + '\"'));\n    }\n\n    if (!isActionAllowedInSignalingState('setRemoteDescription',\n        description.type, pc.signalingState) || pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not set remote ' + description.type +\n          ' in state ' + pc.signalingState));\n    }\n\n    var streams = {};\n    pc.remoteStreams.forEach(function(stream) {\n      streams[stream.id] = stream;\n    });\n    var receiverList = [];\n    var sections = SDPUtils.splitSections(description.sdp);\n    var sessionpart = sections.shift();\n    var isIceLite = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-lite').length > 0;\n    var usingBundle = SDPUtils.matchPrefix(sessionpart,\n        'a=group:BUNDLE ').length > 0;\n    pc.usingBundle = usingBundle;\n    var iceOptions = SDPUtils.matchPrefix(sessionpart,\n        'a=ice-options:')[0];\n    if (iceOptions) {\n      pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ')\n          .indexOf('trickle') >= 0;\n    } else {\n      pc.canTrickleIceCandidates = false;\n    }\n\n    sections.forEach(function(mediaSection, sdpMLineIndex) {\n      var lines = SDPUtils.splitLines(mediaSection);\n      var kind = SDPUtils.getKind(mediaSection);\n      // treat bundle-only as not-rejected.\n      var rejected = SDPUtils.isRejected(mediaSection) &&\n          SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;\n      var protocol = lines[0].substr(2).split(' ')[2];\n\n      var direction = SDPUtils.getDirection(mediaSection, sessionpart);\n      var remoteMsid = SDPUtils.parseMsid(mediaSection);\n\n      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();\n\n      // Reject datachannels which are not implemented yet.\n      if (rejected || (kind === 'application' && (protocol === 'DTLS/SCTP' ||\n          protocol === 'UDP/DTLS/SCTP'))) {\n        // TODO: this is dangerous in the case where a non-rejected m-line\n        //     becomes rejected.\n        pc.transceivers[sdpMLineIndex] = {\n          mid: mid,\n          kind: kind,\n          protocol: protocol,\n          rejected: true\n        };\n        return;\n      }\n\n      if (!rejected && pc.transceivers[sdpMLineIndex] &&\n          pc.transceivers[sdpMLineIndex].rejected) {\n        // recycle a rejected transceiver.\n        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);\n      }\n\n      var transceiver;\n      var iceGatherer;\n      var iceTransport;\n      var dtlsTransport;\n      var rtpReceiver;\n      var sendEncodingParameters;\n      var recvEncodingParameters;\n      var localCapabilities;\n\n      var track;\n      // FIXME: ensure the mediaSection has rtcp-mux set.\n      var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);\n      var remoteIceParameters;\n      var remoteDtlsParameters;\n      if (!rejected) {\n        remoteIceParameters = SDPUtils.getIceParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,\n            sessionpart);\n        remoteDtlsParameters.role = 'client';\n      }\n      recvEncodingParameters =\n          SDPUtils.parseRtpEncodingParameters(mediaSection);\n\n      var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);\n\n      var isComplete = SDPUtils.matchPrefix(mediaSection,\n          'a=end-of-candidates', sessionpart).length > 0;\n      var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')\n          .map(function(cand) {\n            return SDPUtils.parseCandidate(cand);\n          })\n          .filter(function(cand) {\n            return cand.component === 1;\n          });\n\n      // Check if we can use BUNDLE and dispose transports.\n      if ((description.type === 'offer' || description.type === 'answer') &&\n          !rejected && usingBundle && sdpMLineIndex > 0 &&\n          pc.transceivers[sdpMLineIndex]) {\n        pc._disposeIceAndDtlsTransports(sdpMLineIndex);\n        pc.transceivers[sdpMLineIndex].iceGatherer =\n            pc.transceivers[0].iceGatherer;\n        pc.transceivers[sdpMLineIndex].iceTransport =\n            pc.transceivers[0].iceTransport;\n        pc.transceivers[sdpMLineIndex].dtlsTransport =\n            pc.transceivers[0].dtlsTransport;\n        if (pc.transceivers[sdpMLineIndex].rtpSender) {\n          pc.transceivers[sdpMLineIndex].rtpSender.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {\n          pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(\n              pc.transceivers[0].dtlsTransport);\n        }\n      }\n      if (description.type === 'offer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex] ||\n            pc._createTransceiver(kind);\n        transceiver.mid = mid;\n\n        if (!transceiver.iceGatherer) {\n          transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n              usingBundle);\n        }\n\n        if (cands.length && transceiver.iceTransport.state === 'new') {\n          if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {\n            transceiver.iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);\n\n        // filter RTX until additional stuff needed for RTX is implemented\n        // in adapter.js\n        if (edgeVersion < 15019) {\n          localCapabilities.codecs = localCapabilities.codecs.filter(\n              function(codec) {\n                return codec.name !== 'rtx';\n              });\n        }\n\n        sendEncodingParameters = transceiver.sendEncodingParameters || [{\n          ssrc: (2 * sdpMLineIndex + 2) * 1001\n        }];\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        var isNewTrack = false;\n        if (direction === 'sendrecv' || direction === 'sendonly') {\n          isNewTrack = !transceiver.rtpReceiver;\n          rtpReceiver = transceiver.rtpReceiver ||\n              new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);\n\n          if (isNewTrack) {\n            var stream;\n            track = rtpReceiver.track;\n            // FIXME: does not work with Plan B.\n            if (remoteMsid && remoteMsid.stream === '-') {\n              // no-op. a stream id of '-' means: no associated stream.\n            } else if (remoteMsid) {\n              if (!streams[remoteMsid.stream]) {\n                streams[remoteMsid.stream] = new window.MediaStream();\n                Object.defineProperty(streams[remoteMsid.stream], 'id', {\n                  get: function() {\n                    return remoteMsid.stream;\n                  }\n                });\n              }\n              Object.defineProperty(track, 'id', {\n                get: function() {\n                  return remoteMsid.track;\n                }\n              });\n              stream = streams[remoteMsid.stream];\n            } else {\n              if (!streams.default) {\n                streams.default = new window.MediaStream();\n              }\n              stream = streams.default;\n            }\n            if (stream) {\n              addTrackToStreamAndFireEvent(track, stream);\n              transceiver.associatedRemoteMediaStreams.push(stream);\n            }\n            receiverList.push([track, rtpReceiver, stream]);\n          }\n        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {\n          transceiver.associatedRemoteMediaStreams.forEach(function(s) {\n            var nativeTrack = s.getTracks().find(function(t) {\n              return t.id === transceiver.rtpReceiver.track.id;\n            });\n            if (nativeTrack) {\n              removeTrackFromStreamAndFireEvent(nativeTrack, s);\n            }\n          });\n          transceiver.associatedRemoteMediaStreams = [];\n        }\n\n        transceiver.localCapabilities = localCapabilities;\n        transceiver.remoteCapabilities = remoteCapabilities;\n        transceiver.rtpReceiver = rtpReceiver;\n        transceiver.rtcpParameters = rtcpParameters;\n        transceiver.sendEncodingParameters = sendEncodingParameters;\n        transceiver.recvEncodingParameters = recvEncodingParameters;\n\n        // Start the RTCRtpReceiver now. The RTPSender is started in\n        // setLocalDescription.\n        pc._transceive(pc.transceivers[sdpMLineIndex],\n            false,\n            isNewTrack);\n      } else if (description.type === 'answer' && !rejected) {\n        transceiver = pc.transceivers[sdpMLineIndex];\n        iceGatherer = transceiver.iceGatherer;\n        iceTransport = transceiver.iceTransport;\n        dtlsTransport = transceiver.dtlsTransport;\n        rtpReceiver = transceiver.rtpReceiver;\n        sendEncodingParameters = transceiver.sendEncodingParameters;\n        localCapabilities = transceiver.localCapabilities;\n\n        pc.transceivers[sdpMLineIndex].recvEncodingParameters =\n            recvEncodingParameters;\n        pc.transceivers[sdpMLineIndex].remoteCapabilities =\n            remoteCapabilities;\n        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;\n\n        if (cands.length && iceTransport.state === 'new') {\n          if ((isIceLite || isComplete) &&\n              (!usingBundle || sdpMLineIndex === 0)) {\n            iceTransport.setRemoteCandidates(cands);\n          } else {\n            cands.forEach(function(candidate) {\n              maybeAddCandidate(transceiver.iceTransport, candidate);\n            });\n          }\n        }\n\n        if (!usingBundle || sdpMLineIndex === 0) {\n          if (iceTransport.state === 'new') {\n            iceTransport.start(iceGatherer, remoteIceParameters,\n                'controlling');\n          }\n          if (dtlsTransport.state === 'new') {\n            dtlsTransport.start(remoteDtlsParameters);\n          }\n        }\n\n        // If the offer contained RTX but the answer did not,\n        // remove RTX from sendEncodingParameters.\n        var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n        var hasRtx = commonCapabilities.codecs.filter(function(c) {\n          return c.name.toLowerCase() === 'rtx';\n        }).length;\n        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n          delete transceiver.sendEncodingParameters[0].rtx;\n        }\n\n        pc._transceive(transceiver,\n            direction === 'sendrecv' || direction === 'recvonly',\n            direction === 'sendrecv' || direction === 'sendonly');\n\n        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams\n        if (rtpReceiver &&\n            (direction === 'sendrecv' || direction === 'sendonly')) {\n          track = rtpReceiver.track;\n          if (remoteMsid) {\n            if (!streams[remoteMsid.stream]) {\n              streams[remoteMsid.stream] = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);\n            receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);\n          } else {\n            if (!streams.default) {\n              streams.default = new window.MediaStream();\n            }\n            addTrackToStreamAndFireEvent(track, streams.default);\n            receiverList.push([track, rtpReceiver, streams.default]);\n          }\n        } else {\n          // FIXME: actually the receiver should be created later.\n          delete transceiver.rtpReceiver;\n        }\n      }\n    });\n\n    if (pc._dtlsRole === undefined) {\n      pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';\n    }\n\n    pc._remoteDescription = {\n      type: description.type,\n      sdp: description.sdp\n    };\n    if (description.type === 'offer') {\n      pc._updateSignalingState('have-remote-offer');\n    } else {\n      pc._updateSignalingState('stable');\n    }\n    Object.keys(streams).forEach(function(sid) {\n      var stream = streams[sid];\n      if (stream.getTracks().length) {\n        if (pc.remoteStreams.indexOf(stream) === -1) {\n          pc.remoteStreams.push(stream);\n          var event = new Event('addstream');\n          event.stream = stream;\n          window.setTimeout(function() {\n            pc._dispatchEvent('addstream', event);\n          });\n        }\n\n        receiverList.forEach(function(item) {\n          var track = item[0];\n          var receiver = item[1];\n          if (stream.id !== item[2].id) {\n            return;\n          }\n          fireAddTrack(pc, track, receiver, [stream]);\n        });\n      }\n    });\n    receiverList.forEach(function(item) {\n      if (item[2]) {\n        return;\n      }\n      fireAddTrack(pc, item[0], item[1], []);\n    });\n\n    // check whether addIceCandidate({}) was called within four seconds after\n    // setRemoteDescription.\n    window.setTimeout(function() {\n      if (!(pc && pc.transceivers)) {\n        return;\n      }\n      pc.transceivers.forEach(function(transceiver) {\n        if (transceiver.iceTransport &&\n            transceiver.iceTransport.state === 'new' &&\n            transceiver.iceTransport.getRemoteCandidates().length > 0) {\n          console.warn('Timeout for addRemoteCandidate. Consider sending ' +\n              'an end-of-candidates notification');\n          transceiver.iceTransport.addRemoteCandidate({});\n        }\n      });\n    }, 4000);\n\n    return Promise.resolve();\n  };\n\n  RTCPeerConnection.prototype.close = function() {\n    this.transceivers.forEach(function(transceiver) {\n      /* not yet\n      if (transceiver.iceGatherer) {\n        transceiver.iceGatherer.close();\n      }\n      */\n      if (transceiver.iceTransport) {\n        transceiver.iceTransport.stop();\n      }\n      if (transceiver.dtlsTransport) {\n        transceiver.dtlsTransport.stop();\n      }\n      if (transceiver.rtpSender) {\n        transceiver.rtpSender.stop();\n      }\n      if (transceiver.rtpReceiver) {\n        transceiver.rtpReceiver.stop();\n      }\n    });\n    // FIXME: clean up tracks, local streams, remote streams, etc\n    this._isClosed = true;\n    this._updateSignalingState('closed');\n  };\n\n  // Update the signaling state.\n  RTCPeerConnection.prototype._updateSignalingState = function(newState) {\n    this.signalingState = newState;\n    var event = new Event('signalingstatechange');\n    this._dispatchEvent('signalingstatechange', event);\n  };\n\n  // Determine whether to fire the negotiationneeded event.\n  RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {\n    var pc = this;\n    if (this.signalingState !== 'stable' || this.needNegotiation === true) {\n      return;\n    }\n    this.needNegotiation = true;\n    window.setTimeout(function() {\n      if (pc.needNegotiation) {\n        pc.needNegotiation = false;\n        var event = new Event('negotiationneeded');\n        pc._dispatchEvent('negotiationneeded', event);\n      }\n    }, 0);\n  };\n\n  // Update the ice connection state.\n  RTCPeerConnection.prototype._updateIceConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      checking: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n      }\n    });\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.checking > 0) {\n      newState = 'checking';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    } else if (states.completed > 0) {\n      newState = 'completed';\n    }\n\n    if (newState !== this.iceConnectionState) {\n      this.iceConnectionState = newState;\n      var event = new Event('iceconnectionstatechange');\n      this._dispatchEvent('iceconnectionstatechange', event);\n    }\n  };\n\n  // Update the connection state.\n  RTCPeerConnection.prototype._updateConnectionState = function() {\n    var newState;\n    var states = {\n      'new': 0,\n      closed: 0,\n      connecting: 0,\n      connected: 0,\n      completed: 0,\n      disconnected: 0,\n      failed: 0\n    };\n    this.transceivers.forEach(function(transceiver) {\n      if (transceiver.iceTransport && transceiver.dtlsTransport &&\n          !transceiver.rejected) {\n        states[transceiver.iceTransport.state]++;\n        states[transceiver.dtlsTransport.state]++;\n      }\n    });\n    // ICETransport.completed and connected are the same for this purpose.\n    states.connected += states.completed;\n\n    newState = 'new';\n    if (states.failed > 0) {\n      newState = 'failed';\n    } else if (states.connecting > 0) {\n      newState = 'connecting';\n    } else if (states.disconnected > 0) {\n      newState = 'disconnected';\n    } else if (states.new > 0) {\n      newState = 'new';\n    } else if (states.connected > 0) {\n      newState = 'connected';\n    }\n\n    if (newState !== this.connectionState) {\n      this.connectionState = newState;\n      var event = new Event('connectionstatechange');\n      this._dispatchEvent('connectionstatechange', event);\n    }\n  };\n\n  RTCPeerConnection.prototype.createOffer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createOffer after close'));\n    }\n\n    var numAudioTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'audio';\n    }).length;\n    var numVideoTracks = pc.transceivers.filter(function(t) {\n      return t.kind === 'video';\n    }).length;\n\n    // Determine number of audio and video tracks we need to send/recv.\n    var offerOptions = arguments[0];\n    if (offerOptions) {\n      // Reject Chrome legacy constraints.\n      if (offerOptions.mandatory || offerOptions.optional) {\n        throw new TypeError(\n            'Legacy mandatory/optional constraints not supported.');\n      }\n      if (offerOptions.offerToReceiveAudio !== undefined) {\n        if (offerOptions.offerToReceiveAudio === true) {\n          numAudioTracks = 1;\n        } else if (offerOptions.offerToReceiveAudio === false) {\n          numAudioTracks = 0;\n        } else {\n          numAudioTracks = offerOptions.offerToReceiveAudio;\n        }\n      }\n      if (offerOptions.offerToReceiveVideo !== undefined) {\n        if (offerOptions.offerToReceiveVideo === true) {\n          numVideoTracks = 1;\n        } else if (offerOptions.offerToReceiveVideo === false) {\n          numVideoTracks = 0;\n        } else {\n          numVideoTracks = offerOptions.offerToReceiveVideo;\n        }\n      }\n    }\n\n    pc.transceivers.forEach(function(transceiver) {\n      if (transceiver.kind === 'audio') {\n        numAudioTracks--;\n        if (numAudioTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      } else if (transceiver.kind === 'video') {\n        numVideoTracks--;\n        if (numVideoTracks < 0) {\n          transceiver.wantReceive = false;\n        }\n      }\n    });\n\n    // Create M-lines for recvonly streams.\n    while (numAudioTracks > 0 || numVideoTracks > 0) {\n      if (numAudioTracks > 0) {\n        pc._createTransceiver('audio');\n        numAudioTracks--;\n      }\n      if (numVideoTracks > 0) {\n        pc._createTransceiver('video');\n        numVideoTracks--;\n      }\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      // For each track, create an ice gatherer, ice transport,\n      // dtls transport, potentially rtpsender and rtpreceiver.\n      var track = transceiver.track;\n      var kind = transceiver.kind;\n      var mid = transceiver.mid || SDPUtils.generateIdentifier();\n      transceiver.mid = mid;\n\n      if (!transceiver.iceGatherer) {\n        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,\n            pc.usingBundle);\n      }\n\n      var localCapabilities = window.RTCRtpSender.getCapabilities(kind);\n      // filter RTX until additional stuff needed for RTX is implemented\n      // in adapter.js\n      if (edgeVersion < 15019) {\n        localCapabilities.codecs = localCapabilities.codecs.filter(\n            function(codec) {\n              return codec.name !== 'rtx';\n            });\n      }\n      localCapabilities.codecs.forEach(function(codec) {\n        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552\n        // by adding level-asymmetry-allowed=1\n        if (codec.name === 'H264' &&\n            codec.parameters['level-asymmetry-allowed'] === undefined) {\n          codec.parameters['level-asymmetry-allowed'] = '1';\n        }\n\n        // for subsequent offers, we might have to re-use the payload\n        // type of the last offer.\n        if (transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.codecs) {\n          transceiver.remoteCapabilities.codecs.forEach(function(remoteCodec) {\n            if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() &&\n                codec.clockRate === remoteCodec.clockRate) {\n              codec.preferredPayloadType = remoteCodec.payloadType;\n            }\n          });\n        }\n      });\n      localCapabilities.headerExtensions.forEach(function(hdrExt) {\n        var remoteExtensions = transceiver.remoteCapabilities &&\n            transceiver.remoteCapabilities.headerExtensions || [];\n        remoteExtensions.forEach(function(rHdrExt) {\n          if (hdrExt.uri === rHdrExt.uri) {\n            hdrExt.id = rHdrExt.id;\n          }\n        });\n      });\n\n      // generate an ssrc now, to be used later in rtpSender.send\n      var sendEncodingParameters = transceiver.sendEncodingParameters || [{\n        ssrc: (2 * sdpMLineIndex + 1) * 1001\n      }];\n      if (track) {\n        // add RTX\n        if (edgeVersion >= 15019 && kind === 'video' &&\n            !sendEncodingParameters[0].rtx) {\n          sendEncodingParameters[0].rtx = {\n            ssrc: sendEncodingParameters[0].ssrc + 1\n          };\n        }\n      }\n\n      if (transceiver.wantReceive) {\n        transceiver.rtpReceiver = new window.RTCRtpReceiver(\n            transceiver.dtlsTransport, kind);\n      }\n\n      transceiver.localCapabilities = localCapabilities;\n      transceiver.sendEncodingParameters = sendEncodingParameters;\n    });\n\n    // always offer BUNDLE and dispose on return if not supported.\n    if (pc._config.bundlePolicy !== 'max-compat') {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      sdp += writeMediaSection(transceiver, transceiver.localCapabilities,\n          'offer', transceiver.stream, pc._dtlsRole);\n      sdp += 'a=rtcp-rsize\\r\\n';\n\n      if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' &&\n          (sdpMLineIndex === 0 || !pc.usingBundle)) {\n        transceiver.iceGatherer.getLocalCandidates().forEach(function(cand) {\n          cand.component = 1;\n          sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\\r\\n';\n        });\n\n        if (transceiver.iceGatherer.state === 'completed') {\n          sdp += 'a=end-of-candidates\\r\\n';\n        }\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'offer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.createAnswer = function() {\n    var pc = this;\n\n    if (pc._isClosed) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer after close'));\n    }\n\n    if (!(pc.signalingState === 'have-remote-offer' ||\n        pc.signalingState === 'have-local-pranswer')) {\n      return Promise.reject(makeError('InvalidStateError',\n          'Can not call createAnswer in signalingState ' + pc.signalingState));\n    }\n\n    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,\n        pc._sdpSessionVersion++);\n    if (pc.usingBundle) {\n      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {\n        return t.mid;\n      }).join(' ') + '\\r\\n';\n    }\n    sdp += 'a=ice-options:trickle\\r\\n';\n\n    var mediaSectionsInOffer = SDPUtils.getMediaSections(\n        pc._remoteDescription.sdp).length;\n    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {\n      if (sdpMLineIndex + 1 > mediaSectionsInOffer) {\n        return;\n      }\n      if (transceiver.rejected) {\n        if (transceiver.kind === 'application') {\n          if (transceiver.protocol === 'DTLS/SCTP') { // legacy fmt\n            sdp += 'm=application 0 DTLS/SCTP 5000\\r\\n';\n          } else {\n            sdp += 'm=application 0 ' + transceiver.protocol +\n                ' webrtc-datachannel\\r\\n';\n          }\n        } else if (transceiver.kind === 'audio') {\n          sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\\r\\n' +\n              'a=rtpmap:0 PCMU/8000\\r\\n';\n        } else if (transceiver.kind === 'video') {\n          sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\\r\\n' +\n              'a=rtpmap:120 VP8/90000\\r\\n';\n        }\n        sdp += 'c=IN IP4 0.0.0.0\\r\\n' +\n            'a=inactive\\r\\n' +\n            'a=mid:' + transceiver.mid + '\\r\\n';\n        return;\n      }\n\n      // FIXME: look at direction.\n      if (transceiver.stream) {\n        var localTrack;\n        if (transceiver.kind === 'audio') {\n          localTrack = transceiver.stream.getAudioTracks()[0];\n        } else if (transceiver.kind === 'video') {\n          localTrack = transceiver.stream.getVideoTracks()[0];\n        }\n        if (localTrack) {\n          // add RTX\n          if (edgeVersion >= 15019 && transceiver.kind === 'video' &&\n              !transceiver.sendEncodingParameters[0].rtx) {\n            transceiver.sendEncodingParameters[0].rtx = {\n              ssrc: transceiver.sendEncodingParameters[0].ssrc + 1\n            };\n          }\n        }\n      }\n\n      // Calculate intersection of capabilities.\n      var commonCapabilities = getCommonCapabilities(\n          transceiver.localCapabilities,\n          transceiver.remoteCapabilities);\n\n      var hasRtx = commonCapabilities.codecs.filter(function(c) {\n        return c.name.toLowerCase() === 'rtx';\n      }).length;\n      if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {\n        delete transceiver.sendEncodingParameters[0].rtx;\n      }\n\n      sdp += writeMediaSection(transceiver, commonCapabilities,\n          'answer', transceiver.stream, pc._dtlsRole);\n      if (transceiver.rtcpParameters &&\n          transceiver.rtcpParameters.reducedSize) {\n        sdp += 'a=rtcp-rsize\\r\\n';\n      }\n    });\n\n    var desc = new window.RTCSessionDescription({\n      type: 'answer',\n      sdp: sdp\n    });\n    return Promise.resolve(desc);\n  };\n\n  RTCPeerConnection.prototype.addIceCandidate = function(candidate) {\n    var pc = this;\n    var sections;\n    if (candidate && !(candidate.sdpMLineIndex !== undefined ||\n        candidate.sdpMid)) {\n      return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));\n    }\n\n    // TODO: needs to go into ops queue.\n    return new Promise(function(resolve, reject) {\n      if (!pc._remoteDescription) {\n        return reject(makeError('InvalidStateError',\n            'Can not add ICE candidate without a remote description'));\n      } else if (!candidate || candidate.candidate === '') {\n        for (var j = 0; j < pc.transceivers.length; j++) {\n          if (pc.transceivers[j].rejected) {\n            continue;\n          }\n          pc.transceivers[j].iceTransport.addRemoteCandidate({});\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[j] += 'a=end-of-candidates\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n          if (pc.usingBundle) {\n            break;\n          }\n        }\n      } else {\n        var sdpMLineIndex = candidate.sdpMLineIndex;\n        if (candidate.sdpMid) {\n          for (var i = 0; i < pc.transceivers.length; i++) {\n            if (pc.transceivers[i].mid === candidate.sdpMid) {\n              sdpMLineIndex = i;\n              break;\n            }\n          }\n        }\n        var transceiver = pc.transceivers[sdpMLineIndex];\n        if (transceiver) {\n          if (transceiver.rejected) {\n            return resolve();\n          }\n          var cand = Object.keys(candidate.candidate).length > 0 ?\n              SDPUtils.parseCandidate(candidate.candidate) : {};\n          // Ignore Chrome's invalid candidates since Edge does not like them.\n          if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {\n            return resolve();\n          }\n          // Ignore RTCP candidates, we assume RTCP-MUX.\n          if (cand.component && cand.component !== 1) {\n            return resolve();\n          }\n          // when using bundle, avoid adding candidates to the wrong\n          // ice transport. And avoid adding candidates added in the SDP.\n          if (sdpMLineIndex === 0 || (sdpMLineIndex > 0 &&\n              transceiver.iceTransport !== pc.transceivers[0].iceTransport)) {\n            if (!maybeAddCandidate(transceiver.iceTransport, cand)) {\n              return reject(makeError('OperationError',\n                  'Can not add ICE candidate'));\n            }\n          }\n\n          // update the remoteDescription.\n          var candidateString = candidate.candidate.trim();\n          if (candidateString.indexOf('a=') === 0) {\n            candidateString = candidateString.substr(2);\n          }\n          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);\n          sections[sdpMLineIndex] += 'a=' +\n              (cand.type ? candidateString : 'end-of-candidates')\n              + '\\r\\n';\n          pc._remoteDescription.sdp =\n              SDPUtils.getDescription(pc._remoteDescription.sdp) +\n              sections.join('');\n        } else {\n          return reject(makeError('OperationError',\n              'Can not add ICE candidate'));\n        }\n      }\n      resolve();\n    });\n  };\n\n  RTCPeerConnection.prototype.getStats = function(selector) {\n    if (selector && selector instanceof window.MediaStreamTrack) {\n      var senderOrReceiver = null;\n      this.transceivers.forEach(function(transceiver) {\n        if (transceiver.rtpSender &&\n            transceiver.rtpSender.track === selector) {\n          senderOrReceiver = transceiver.rtpSender;\n        } else if (transceiver.rtpReceiver &&\n            transceiver.rtpReceiver.track === selector) {\n          senderOrReceiver = transceiver.rtpReceiver;\n        }\n      });\n      if (!senderOrReceiver) {\n        throw makeError('InvalidAccessError', 'Invalid selector.');\n      }\n      return senderOrReceiver.getStats();\n    }\n\n    var promises = [];\n    this.transceivers.forEach(function(transceiver) {\n      ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',\n          'dtlsTransport'].forEach(function(method) {\n            if (transceiver[method]) {\n              promises.push(transceiver[method].getStats());\n            }\n          });\n    });\n    return Promise.all(promises).then(function(allStats) {\n      var results = new Map();\n      allStats.forEach(function(stats) {\n        stats.forEach(function(stat) {\n          results.set(stat.id, stat);\n        });\n      });\n      return results;\n    });\n  };\n\n  // fix low-level stat names and return Map instead of object.\n  var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer',\n    'RTCIceTransport', 'RTCDtlsTransport'];\n  ortcObjects.forEach(function(ortcObjectName) {\n    var obj = window[ortcObjectName];\n    if (obj && obj.prototype && obj.prototype.getStats) {\n      var nativeGetstats = obj.prototype.getStats;\n      obj.prototype.getStats = function() {\n        return nativeGetstats.apply(this)\n        .then(function(nativeStats) {\n          var mapStats = new Map();\n          Object.keys(nativeStats).forEach(function(id) {\n            nativeStats[id].type = fixStatsType(nativeStats[id]);\n            mapStats.set(id, nativeStats[id]);\n          });\n          return mapStats;\n        });\n      };\n    }\n  });\n\n  // legacy callback shims. Should be moved to adapter.js some days.\n  var methods = ['createOffer', 'createAnswer'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[0] === 'function' ||\n          typeof args[1] === 'function') { // legacy\n        return nativeMethod.apply(this, [arguments[2]])\n        .then(function(description) {\n          if (typeof args[0] === 'function') {\n            args[0].apply(null, [description]);\n          }\n        }, function(error) {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];\n  methods.forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function' ||\n          typeof args[2] === 'function') { // legacy\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        }, function(error) {\n          if (typeof args[2] === 'function') {\n            args[2].apply(null, [error]);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  // getStats is special. It doesn't have a spec legacy method yet we support\n  // getStats(something, cb) without error callbacks.\n  ['getStats'].forEach(function(method) {\n    var nativeMethod = RTCPeerConnection.prototype[method];\n    RTCPeerConnection.prototype[method] = function() {\n      var args = arguments;\n      if (typeof args[1] === 'function') {\n        return nativeMethod.apply(this, arguments)\n        .then(function() {\n          if (typeof args[1] === 'function') {\n            args[1].apply(null);\n          }\n        });\n      }\n      return nativeMethod.apply(this, arguments);\n    };\n  });\n\n  return RTCPeerConnection;\n};\n\n},{\"sdp\":17}],17:[function(require,module,exports){\n/* eslint-env node */\n'use strict';\n\n// SDP helpers.\nvar SDPUtils = {};\n\n// Generate an alphanumeric identifier for cname or mids.\n// TODO: use UUIDs instead? https://gist.github.com/jed/982883\nSDPUtils.generateIdentifier = function() {\n  return Math.random().toString(36).substr(2, 10);\n};\n\n// The RTCP CNAME used by all peerconnections from the same JS.\nSDPUtils.localCName = SDPUtils.generateIdentifier();\n\n// Splits SDP into lines, dealing with both CRLF and LF.\nSDPUtils.splitLines = function(blob) {\n  return blob.trim().split('\\n').map(function(line) {\n    return line.trim();\n  });\n};\n// Splits SDP into sessionpart and mediasections. Ensures CRLF.\nSDPUtils.splitSections = function(blob) {\n  var parts = blob.split('\\nm=');\n  return parts.map(function(part, index) {\n    return (index > 0 ? 'm=' + part : part).trim() + '\\r\\n';\n  });\n};\n\n// returns the session description.\nSDPUtils.getDescription = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  return sections && sections[0];\n};\n\n// returns the individual media sections.\nSDPUtils.getMediaSections = function(blob) {\n  var sections = SDPUtils.splitSections(blob);\n  sections.shift();\n  return sections;\n};\n\n// Returns lines that start with a certain prefix.\nSDPUtils.matchPrefix = function(blob, prefix) {\n  return SDPUtils.splitLines(blob).filter(function(line) {\n    return line.indexOf(prefix) === 0;\n  });\n};\n\n// Parses an ICE candidate line. Sample input:\n// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8\n// rport 55996\"\nSDPUtils.parseCandidate = function(line) {\n  var parts;\n  // Parse both variants.\n  if (line.indexOf('a=candidate:') === 0) {\n    parts = line.substring(12).split(' ');\n  } else {\n    parts = line.substring(10).split(' ');\n  }\n\n  var candidate = {\n    foundation: parts[0],\n    component: parseInt(parts[1], 10),\n    protocol: parts[2].toLowerCase(),\n    priority: parseInt(parts[3], 10),\n    ip: parts[4],\n    address: parts[4], // address is an alias for ip.\n    port: parseInt(parts[5], 10),\n    // skip parts[6] == 'typ'\n    type: parts[7]\n  };\n\n  for (var i = 8; i < parts.length; i += 2) {\n    switch (parts[i]) {\n      case 'raddr':\n        candidate.relatedAddress = parts[i + 1];\n        break;\n      case 'rport':\n        candidate.relatedPort = parseInt(parts[i + 1], 10);\n        break;\n      case 'tcptype':\n        candidate.tcpType = parts[i + 1];\n        break;\n      case 'ufrag':\n        candidate.ufrag = parts[i + 1]; // for backward compability.\n        candidate.usernameFragment = parts[i + 1];\n        break;\n      default: // extension handling, in particular ufrag\n        candidate[parts[i]] = parts[i + 1];\n        break;\n    }\n  }\n  return candidate;\n};\n\n// Translates a candidate object into SDP candidate attribute.\nSDPUtils.writeCandidate = function(candidate) {\n  var sdp = [];\n  sdp.push(candidate.foundation);\n  sdp.push(candidate.component);\n  sdp.push(candidate.protocol.toUpperCase());\n  sdp.push(candidate.priority);\n  sdp.push(candidate.address || candidate.ip);\n  sdp.push(candidate.port);\n\n  var type = candidate.type;\n  sdp.push('typ');\n  sdp.push(type);\n  if (type !== 'host' && candidate.relatedAddress &&\n      candidate.relatedPort) {\n    sdp.push('raddr');\n    sdp.push(candidate.relatedAddress);\n    sdp.push('rport');\n    sdp.push(candidate.relatedPort);\n  }\n  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {\n    sdp.push('tcptype');\n    sdp.push(candidate.tcpType);\n  }\n  if (candidate.usernameFragment || candidate.ufrag) {\n    sdp.push('ufrag');\n    sdp.push(candidate.usernameFragment || candidate.ufrag);\n  }\n  return 'candidate:' + sdp.join(' ');\n};\n\n// Parses an ice-options line, returns an array of option tags.\n// a=ice-options:foo bar\nSDPUtils.parseIceOptions = function(line) {\n  return line.substr(14).split(' ');\n};\n\n// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:\n// a=rtpmap:111 opus/48000/2\nSDPUtils.parseRtpMap = function(line) {\n  var parts = line.substr(9).split(' ');\n  var parsed = {\n    payloadType: parseInt(parts.shift(), 10) // was: id\n  };\n\n  parts = parts[0].split('/');\n\n  parsed.name = parts[0];\n  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate\n  parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;\n  // legacy alias, got renamed back to channels in ORTC.\n  parsed.numChannels = parsed.channels;\n  return parsed;\n};\n\n// Generate an a=rtpmap line from RTCRtpCodecCapability or\n// RTCRtpCodecParameters.\nSDPUtils.writeRtpMap = function(codec) {\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  var channels = codec.channels || codec.numChannels || 1;\n  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +\n      (channels !== 1 ? '/' + channels : '') + '\\r\\n';\n};\n\n// Parses an a=extmap line (headerextension from RFC 5285). Sample input:\n// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset\n// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset\nSDPUtils.parseExtmap = function(line) {\n  var parts = line.substr(9).split(' ');\n  return {\n    id: parseInt(parts[0], 10),\n    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',\n    uri: parts[1]\n  };\n};\n\n// Generates a=extmap line from RTCRtpHeaderExtensionParameters or\n// RTCRtpHeaderExtension.\nSDPUtils.writeExtmap = function(headerExtension) {\n  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +\n      (headerExtension.direction && headerExtension.direction !== 'sendrecv'\n        ? '/' + headerExtension.direction\n        : '') +\n      ' ' + headerExtension.uri + '\\r\\n';\n};\n\n// Parses an ftmp line, returns dictionary. Sample input:\n// a=fmtp:96 vbr=on;cng=on\n// Also deals with vbr=on; cng=on\nSDPUtils.parseFmtp = function(line) {\n  var parsed = {};\n  var kv;\n  var parts = line.substr(line.indexOf(' ') + 1).split(';');\n  for (var j = 0; j < parts.length; j++) {\n    kv = parts[j].trim().split('=');\n    parsed[kv[0].trim()] = kv[1];\n  }\n  return parsed;\n};\n\n// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeFmtp = function(codec) {\n  var line = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.parameters && Object.keys(codec.parameters).length) {\n    var params = [];\n    Object.keys(codec.parameters).forEach(function(param) {\n      if (codec.parameters[param]) {\n        params.push(param + '=' + codec.parameters[param]);\n      } else {\n        params.push(param);\n      }\n    });\n    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\\r\\n';\n  }\n  return line;\n};\n\n// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:\n// a=rtcp-fb:98 nack rpsi\nSDPUtils.parseRtcpFb = function(line) {\n  var parts = line.substr(line.indexOf(' ') + 1).split(' ');\n  return {\n    type: parts.shift(),\n    parameter: parts.join(' ')\n  };\n};\n// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.\nSDPUtils.writeRtcpFb = function(codec) {\n  var lines = '';\n  var pt = codec.payloadType;\n  if (codec.preferredPayloadType !== undefined) {\n    pt = codec.preferredPayloadType;\n  }\n  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {\n    // FIXME: special handling for trr-int?\n    codec.rtcpFeedback.forEach(function(fb) {\n      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +\n      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +\n          '\\r\\n';\n    });\n  }\n  return lines;\n};\n\n// Parses an RFC 5576 ssrc media attribute. Sample input:\n// a=ssrc:3735928559 cname:something\nSDPUtils.parseSsrcMedia = function(line) {\n  var sp = line.indexOf(' ');\n  var parts = {\n    ssrc: parseInt(line.substr(7, sp - 7), 10)\n  };\n  var colon = line.indexOf(':', sp);\n  if (colon > -1) {\n    parts.attribute = line.substr(sp + 1, colon - sp - 1);\n    parts.value = line.substr(colon + 1);\n  } else {\n    parts.attribute = line.substr(sp + 1);\n  }\n  return parts;\n};\n\nSDPUtils.parseSsrcGroup = function(line) {\n  var parts = line.substr(13).split(' ');\n  return {\n    semantics: parts.shift(),\n    ssrcs: parts.map(function(ssrc) {\n      return parseInt(ssrc, 10);\n    })\n  };\n};\n\n// Extracts the MID (RFC 5888) from a media section.\n// returns the MID or undefined if no mid line was found.\nSDPUtils.getMid = function(mediaSection) {\n  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];\n  if (mid) {\n    return mid.substr(6);\n  }\n};\n\nSDPUtils.parseFingerprint = function(line) {\n  var parts = line.substr(14).split(' ');\n  return {\n    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.\n    value: parts[1]\n  };\n};\n\n// Extracts DTLS parameters from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the fingerprint line as input. See also getIceParameters.\nSDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,\n    'a=fingerprint:');\n  // Note: a=setup line is ignored since we use the 'auto' role.\n  // Note2: 'algorithm' is not case sensitive except in Edge.\n  return {\n    role: 'auto',\n    fingerprints: lines.map(SDPUtils.parseFingerprint)\n  };\n};\n\n// Serializes DTLS parameters to SDP.\nSDPUtils.writeDtlsParameters = function(params, setupType) {\n  var sdp = 'a=setup:' + setupType + '\\r\\n';\n  params.fingerprints.forEach(function(fp) {\n    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\\r\\n';\n  });\n  return sdp;\n};\n// Parses ICE information from SDP media section or sessionpart.\n// FIXME: for consistency with other functions this should only\n//   get the ice-ufrag and ice-pwd lines as input.\nSDPUtils.getIceParameters = function(mediaSection, sessionpart) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  // Search in session part, too.\n  lines = lines.concat(SDPUtils.splitLines(sessionpart));\n  var iceParameters = {\n    usernameFragment: lines.filter(function(line) {\n      return line.indexOf('a=ice-ufrag:') === 0;\n    })[0].substr(12),\n    password: lines.filter(function(line) {\n      return line.indexOf('a=ice-pwd:') === 0;\n    })[0].substr(10)\n  };\n  return iceParameters;\n};\n\n// Serializes ICE parameters to SDP.\nSDPUtils.writeIceParameters = function(params) {\n  return 'a=ice-ufrag:' + params.usernameFragment + '\\r\\n' +\n      'a=ice-pwd:' + params.password + '\\r\\n';\n};\n\n// Parses the SDP media section and returns RTCRtpParameters.\nSDPUtils.parseRtpParameters = function(mediaSection) {\n  var description = {\n    codecs: [],\n    headerExtensions: [],\n    fecMechanisms: [],\n    rtcp: []\n  };\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]\n    var pt = mline[i];\n    var rtpmapline = SDPUtils.matchPrefix(\n      mediaSection, 'a=rtpmap:' + pt + ' ')[0];\n    if (rtpmapline) {\n      var codec = SDPUtils.parseRtpMap(rtpmapline);\n      var fmtps = SDPUtils.matchPrefix(\n        mediaSection, 'a=fmtp:' + pt + ' ');\n      // Only the first a=fmtp:<pt> is considered.\n      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};\n      codec.rtcpFeedback = SDPUtils.matchPrefix(\n        mediaSection, 'a=rtcp-fb:' + pt + ' ')\n        .map(SDPUtils.parseRtcpFb);\n      description.codecs.push(codec);\n      // parse FEC mechanisms from rtpmap lines.\n      switch (codec.name.toUpperCase()) {\n        case 'RED':\n        case 'ULPFEC':\n          description.fecMechanisms.push(codec.name.toUpperCase());\n          break;\n        default: // only RED and ULPFEC are recognized as FEC mechanisms.\n          break;\n      }\n    }\n  }\n  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {\n    description.headerExtensions.push(SDPUtils.parseExtmap(line));\n  });\n  // FIXME: parse rtcp.\n  return description;\n};\n\n// Generates parts of the SDP media section describing the capabilities /\n// parameters.\nSDPUtils.writeRtpDescription = function(kind, caps) {\n  var sdp = '';\n\n  // Build the mline.\n  sdp += 'm=' + kind + ' ';\n  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.\n  sdp += ' UDP/TLS/RTP/SAVPF ';\n  sdp += caps.codecs.map(function(codec) {\n    if (codec.preferredPayloadType !== undefined) {\n      return codec.preferredPayloadType;\n    }\n    return codec.payloadType;\n  }).join(' ') + '\\r\\n';\n\n  sdp += 'c=IN IP4 0.0.0.0\\r\\n';\n  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\\r\\n';\n\n  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.\n  caps.codecs.forEach(function(codec) {\n    sdp += SDPUtils.writeRtpMap(codec);\n    sdp += SDPUtils.writeFmtp(codec);\n    sdp += SDPUtils.writeRtcpFb(codec);\n  });\n  var maxptime = 0;\n  caps.codecs.forEach(function(codec) {\n    if (codec.maxptime > maxptime) {\n      maxptime = codec.maxptime;\n    }\n  });\n  if (maxptime > 0) {\n    sdp += 'a=maxptime:' + maxptime + '\\r\\n';\n  }\n  sdp += 'a=rtcp-mux\\r\\n';\n\n  if (caps.headerExtensions) {\n    caps.headerExtensions.forEach(function(extension) {\n      sdp += SDPUtils.writeExtmap(extension);\n    });\n  }\n  // FIXME: write fecMechanisms.\n  return sdp;\n};\n\n// Parses the SDP media section and returns an array of\n// RTCRtpEncodingParameters.\nSDPUtils.parseRtpEncodingParameters = function(mediaSection) {\n  var encodingParameters = [];\n  var description = SDPUtils.parseRtpParameters(mediaSection);\n  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;\n  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;\n\n  // filter a=ssrc:... cname:, ignore PlanB-msid\n  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(parts) {\n      return parts.attribute === 'cname';\n    });\n  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;\n  var secondarySsrc;\n\n  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')\n    .map(function(line) {\n      var parts = line.substr(17).split(' ');\n      return parts.map(function(part) {\n        return parseInt(part, 10);\n      });\n    });\n  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {\n    secondarySsrc = flows[0][1];\n  }\n\n  description.codecs.forEach(function(codec) {\n    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {\n      var encParam = {\n        ssrc: primarySsrc,\n        codecPayloadType: parseInt(codec.parameters.apt, 10)\n      };\n      if (primarySsrc && secondarySsrc) {\n        encParam.rtx = {ssrc: secondarySsrc};\n      }\n      encodingParameters.push(encParam);\n      if (hasRed) {\n        encParam = JSON.parse(JSON.stringify(encParam));\n        encParam.fec = {\n          ssrc: primarySsrc,\n          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'\n        };\n        encodingParameters.push(encParam);\n      }\n    }\n  });\n  if (encodingParameters.length === 0 && primarySsrc) {\n    encodingParameters.push({\n      ssrc: primarySsrc\n    });\n  }\n\n  // we support both b=AS and b=TIAS but interpret AS as TIAS.\n  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');\n  if (bandwidth.length) {\n    if (bandwidth[0].indexOf('b=TIAS:') === 0) {\n      bandwidth = parseInt(bandwidth[0].substr(7), 10);\n    } else if (bandwidth[0].indexOf('b=AS:') === 0) {\n      // use formula from JSEP to convert b=AS to TIAS value.\n      bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95\n          - (50 * 40 * 8);\n    } else {\n      bandwidth = undefined;\n    }\n    encodingParameters.forEach(function(params) {\n      params.maxBitrate = bandwidth;\n    });\n  }\n  return encodingParameters;\n};\n\n// parses http://draft.ortc.org/#rtcrtcpparameters*\nSDPUtils.parseRtcpParameters = function(mediaSection) {\n  var rtcpParameters = {};\n\n  // Gets the first SSRC. Note tha with RTX there might be multiple\n  // SSRCs.\n  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(obj) {\n      return obj.attribute === 'cname';\n    })[0];\n  if (remoteSsrc) {\n    rtcpParameters.cname = remoteSsrc.value;\n    rtcpParameters.ssrc = remoteSsrc.ssrc;\n  }\n\n  // Edge uses the compound attribute instead of reducedSize\n  // compound is !reducedSize\n  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');\n  rtcpParameters.reducedSize = rsize.length > 0;\n  rtcpParameters.compound = rsize.length === 0;\n\n  // parses the rtcp-mux attrіbute.\n  // Note that Edge does not support unmuxed RTCP.\n  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');\n  rtcpParameters.mux = mux.length > 0;\n\n  return rtcpParameters;\n};\n\n// parses either a=msid: or a=ssrc:... msid lines and returns\n// the id of the MediaStream and MediaStreamTrack.\nSDPUtils.parseMsid = function(mediaSection) {\n  var parts;\n  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');\n  if (spec.length === 1) {\n    parts = spec[0].substr(7).split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')\n    .map(function(line) {\n      return SDPUtils.parseSsrcMedia(line);\n    })\n    .filter(function(msidParts) {\n      return msidParts.attribute === 'msid';\n    });\n  if (planB.length > 0) {\n    parts = planB[0].value.split(' ');\n    return {stream: parts[0], track: parts[1]};\n  }\n};\n\n// SCTP\n// parses draft-ietf-mmusic-sctp-sdp-26 first and falls back\n// to draft-ietf-mmusic-sctp-sdp-05\nSDPUtils.parseSctpDescription = function(mediaSection) {\n  var mline = SDPUtils.parseMLine(mediaSection);\n  var maxSizeLine = SDPUtils.matchPrefix(mediaSection, 'a=max-message-size:');\n  var maxMessageSize;\n  if (maxSizeLine.length > 0) {\n    maxMessageSize = parseInt(maxSizeLine[0].substr(19), 10);\n  }\n  if (isNaN(maxMessageSize)) {\n    maxMessageSize = 65536;\n  }\n  var sctpPort = SDPUtils.matchPrefix(mediaSection, 'a=sctp-port:');\n  if (sctpPort.length > 0) {\n    return {\n      port: parseInt(sctpPort[0].substr(12), 10),\n      protocol: mline.fmt,\n      maxMessageSize: maxMessageSize\n    };\n  }\n  var sctpMapLines = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:');\n  if (sctpMapLines.length > 0) {\n    var parts = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:')[0]\n      .substr(10)\n      .split(' ');\n    return {\n      port: parseInt(parts[0], 10),\n      protocol: parts[1],\n      maxMessageSize: maxMessageSize\n    };\n  }\n};\n\n// SCTP\n// outputs the draft-ietf-mmusic-sctp-sdp-26 version that all browsers\n// support by now receiving in this format, unless we originally parsed\n// as the draft-ietf-mmusic-sctp-sdp-05 format (indicated by the m-line\n// protocol of DTLS/SCTP -- without UDP/ or TCP/)\nSDPUtils.writeSctpDescription = function(media, sctp) {\n  var output = [];\n  if (media.protocol !== 'DTLS/SCTP') {\n    output = [\n      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.protocol + '\\r\\n',\n      'c=IN IP4 0.0.0.0\\r\\n',\n      'a=sctp-port:' + sctp.port + '\\r\\n'\n    ];\n  } else {\n    output = [\n      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.port + '\\r\\n',\n      'c=IN IP4 0.0.0.0\\r\\n',\n      'a=sctpmap:' + sctp.port + ' ' + sctp.protocol + ' 65535\\r\\n'\n    ];\n  }\n  if (sctp.maxMessageSize !== undefined) {\n    output.push('a=max-message-size:' + sctp.maxMessageSize + '\\r\\n');\n  }\n  return output.join('');\n};\n\n// Generate a session ID for SDP.\n// https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1\n// recommends using a cryptographically random +ve 64-bit value\n// but right now this should be acceptable and within the right range\nSDPUtils.generateSessionId = function() {\n  return Math.random().toString().substr(2, 21);\n};\n\n// Write boilder plate for start of SDP\n// sessId argument is optional - if not supplied it will\n// be generated randomly\n// sessVersion is optional and defaults to 2\n// sessUser is optional and defaults to 'thisisadapterortc'\nSDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {\n  var sessionId;\n  var version = sessVer !== undefined ? sessVer : 2;\n  if (sessId) {\n    sessionId = sessId;\n  } else {\n    sessionId = SDPUtils.generateSessionId();\n  }\n  var user = sessUser || 'thisisadapterortc';\n  // FIXME: sess-id should be an NTP timestamp.\n  return 'v=0\\r\\n' +\n      'o=' + user + ' ' + sessionId + ' ' + version +\n        ' IN IP4 127.0.0.1\\r\\n' +\n      's=-\\r\\n' +\n      't=0 0\\r\\n';\n};\n\nSDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {\n  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);\n\n  // Map ICE parameters (ufrag, pwd) to SDP.\n  sdp += SDPUtils.writeIceParameters(\n    transceiver.iceGatherer.getLocalParameters());\n\n  // Map DTLS parameters to SDP.\n  sdp += SDPUtils.writeDtlsParameters(\n    transceiver.dtlsTransport.getLocalParameters(),\n    type === 'offer' ? 'actpass' : 'active');\n\n  sdp += 'a=mid:' + transceiver.mid + '\\r\\n';\n\n  if (transceiver.direction) {\n    sdp += 'a=' + transceiver.direction + '\\r\\n';\n  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {\n    sdp += 'a=sendrecv\\r\\n';\n  } else if (transceiver.rtpSender) {\n    sdp += 'a=sendonly\\r\\n';\n  } else if (transceiver.rtpReceiver) {\n    sdp += 'a=recvonly\\r\\n';\n  } else {\n    sdp += 'a=inactive\\r\\n';\n  }\n\n  if (transceiver.rtpSender) {\n    // spec.\n    var msid = 'msid:' + stream.id + ' ' +\n        transceiver.rtpSender.track.id + '\\r\\n';\n    sdp += 'a=' + msid;\n\n    // for Chrome.\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n        ' ' + msid;\n    if (transceiver.sendEncodingParameters[0].rtx) {\n      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n          ' ' + msid;\n      sdp += 'a=ssrc-group:FID ' +\n          transceiver.sendEncodingParameters[0].ssrc + ' ' +\n          transceiver.sendEncodingParameters[0].rtx.ssrc +\n          '\\r\\n';\n    }\n  }\n  // FIXME: this should be written by writeRtpDescription.\n  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +\n      ' cname:' + SDPUtils.localCName + '\\r\\n';\n  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {\n    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +\n        ' cname:' + SDPUtils.localCName + '\\r\\n';\n  }\n  return sdp;\n};\n\n// Gets the direction from the mediaSection or the sessionpart.\nSDPUtils.getDirection = function(mediaSection, sessionpart) {\n  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.\n  var lines = SDPUtils.splitLines(mediaSection);\n  for (var i = 0; i < lines.length; i++) {\n    switch (lines[i]) {\n      case 'a=sendrecv':\n      case 'a=sendonly':\n      case 'a=recvonly':\n      case 'a=inactive':\n        return lines[i].substr(2);\n      default:\n        // FIXME: What should happen here?\n    }\n  }\n  if (sessionpart) {\n    return SDPUtils.getDirection(sessionpart);\n  }\n  return 'sendrecv';\n};\n\nSDPUtils.getKind = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var mline = lines[0].split(' ');\n  return mline[0].substr(2);\n};\n\nSDPUtils.isRejected = function(mediaSection) {\n  return mediaSection.split(' ', 2)[1] === '0';\n};\n\nSDPUtils.parseMLine = function(mediaSection) {\n  var lines = SDPUtils.splitLines(mediaSection);\n  var parts = lines[0].substr(2).split(' ');\n  return {\n    kind: parts[0],\n    port: parseInt(parts[1], 10),\n    protocol: parts[2],\n    fmt: parts.slice(3).join(' ')\n  };\n};\n\nSDPUtils.parseOLine = function(mediaSection) {\n  var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];\n  var parts = line.substr(2).split(' ');\n  return {\n    username: parts[0],\n    sessionId: parts[1],\n    sessionVersion: parseInt(parts[2], 10),\n    netType: parts[3],\n    addressType: parts[4],\n    address: parts[5]\n  };\n};\n\n// a very naive interpretation of a valid SDP.\nSDPUtils.isValidSDP = function(blob) {\n  if (typeof blob !== 'string' || blob.length === 0) {\n    return false;\n  }\n  var lines = SDPUtils.splitLines(blob);\n  for (var i = 0; i < lines.length; i++) {\n    if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {\n      return false;\n    }\n    // TODO: check the modifier a bit more.\n  }\n  return true;\n};\n\n// Expose public methods.\nif (typeof module === 'object') {\n  module.exports = SDPUtils;\n}\n\n},{}]},{},[1])(1)\n});"],"file":"adapter.min.js"}
\ No newline at end of file
diff --git a/lib/amd/src/adapter.js b/lib/amd/src/adapter.js
index 13a5850b12b..9b321d96afe 100644
--- a/lib/amd/src/adapter.js
+++ b/lib/amd/src/adapter.js
@@ -18,5402 +18,5499 @@
 
 define([], function() {
 return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-        'use strict';
-
-        var SDPUtils = require('sdp');
-
-        function fixStatsType(stat) {
-            return {
-                inboundrtp: 'inbound-rtp',
-                outboundrtp: 'outbound-rtp',
-                candidatepair: 'candidate-pair',
-                localcandidate: 'local-candidate',
-                remotecandidate: 'remote-candidate'
-            }[stat.type] || stat.type;
-        }
-
-        function writeMediaSection(transceiver, caps, type, stream, dtlsRole) {
-            var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);
-
-            // Map ICE parameters (ufrag, pwd) to SDP.
-            sdp += SDPUtils.writeIceParameters(
-                transceiver.iceGatherer.getLocalParameters());
-
-            // Map DTLS parameters to SDP.
-            sdp += SDPUtils.writeDtlsParameters(
-                transceiver.dtlsTransport.getLocalParameters(),
-                type === 'offer' ? 'actpass' : dtlsRole || 'active');
-
-            sdp += 'a=mid:' + transceiver.mid + '\r\n';
-
-            if (transceiver.rtpSender && transceiver.rtpReceiver) {
-                sdp += 'a=sendrecv\r\n';
-            } else if (transceiver.rtpSender) {
-                sdp += 'a=sendonly\r\n';
-            } else if (transceiver.rtpReceiver) {
-                sdp += 'a=recvonly\r\n';
-            } else {
-                sdp += 'a=inactive\r\n';
-            }
-
-            if (transceiver.rtpSender) {
-                var trackId = transceiver.rtpSender._initialTrackId ||
-                    transceiver.rtpSender.track.id;
-                transceiver.rtpSender._initialTrackId = trackId;
-                // spec.
-                var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +
-                    trackId + '\r\n';
-                sdp += 'a=' + msid;
-                // for Chrome. Legacy should no longer be required.
-                sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
-                    ' ' + msid;
-
-                // RTX
-                if (transceiver.sendEncodingParameters[0].rtx) {
-                    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
-                        ' ' + msid;
-                    sdp += 'a=ssrc-group:FID ' +
-                        transceiver.sendEncodingParameters[0].ssrc + ' ' +
-                        transceiver.sendEncodingParameters[0].rtx.ssrc +
-                        '\r\n';
-                }
-            }
-            // FIXME: this should be written by writeRtpDescription.
-            sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
-                ' cname:' + SDPUtils.localCName + '\r\n';
-            if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
-                sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
-                    ' cname:' + SDPUtils.localCName + '\r\n';
-            }
-            return sdp;
-        }
-
-        // Edge does not like
-        // 1) stun: filtered after 14393 unless ?transport=udp is present
-        // 2) turn: that does not have all of turn:host:port?transport=udp
-        // 3) turn: with ipv6 addresses
-        // 4) turn: occurring muliple times
-        function filterIceServers(iceServers, edgeVersion) {
-            var hasTurn = false;
-            iceServers = JSON.parse(JSON.stringify(iceServers));
-            return iceServers.filter(function(server) {
-                if (server && (server.urls || server.url)) {
-                    var urls = server.urls || server.url;
-                    if (server.url && !server.urls) {
-                        console.warn('RTCIceServer.url is deprecated! Use urls instead.');
-                    }
-                    var isString = typeof urls === 'string';
-                    if (isString) {
-                        urls = [urls];
-                    }
-                    urls = urls.filter(function(url) {
-                        var validTurn = url.indexOf('turn:') === 0 &&
-                            url.indexOf('transport=udp') !== -1 &&
-                            url.indexOf('turn:[') === -1 &&
-                            !hasTurn;
-
-                        if (validTurn) {
-                            hasTurn = true;
-                            return true;
-                        }
-                        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&
-                            url.indexOf('?transport=udp') === -1;
-                    });
-
-                    delete server.url;
-                    server.urls = isString ? urls[0] : urls;
-                    return !!urls.length;
-                }
-            });
-        }
-
-        // Determines the intersection of local and remote capabilities.
-        function getCommonCapabilities(localCapabilities, remoteCapabilities) {
-            var commonCapabilities = {
-                codecs: [],
-                headerExtensions: [],
-                fecMechanisms: []
-            };
-
-            var findCodecByPayloadType = function(pt, codecs) {
-                pt = parseInt(pt, 10);
-                for (var i = 0; i < codecs.length; i++) {
-                    if (codecs[i].payloadType === pt ||
-                        codecs[i].preferredPayloadType === pt) {
-                        return codecs[i];
-                    }
-                }
-            };
-
-            var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {
-                var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);
-                var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);
-                return lCodec && rCodec &&
-                    lCodec.name.toLowerCase() === rCodec.name.toLowerCase();
-            };
-
-            localCapabilities.codecs.forEach(function(lCodec) {
-                for (var i = 0; i < remoteCapabilities.codecs.length; i++) {
-                    var rCodec = remoteCapabilities.codecs[i];
-                    if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&
-                        lCodec.clockRate === rCodec.clockRate) {
-                        if (lCodec.name.toLowerCase() === 'rtx' &&
-                            lCodec.parameters && rCodec.parameters.apt) {
-                            // for RTX we need to find the local rtx that has a apt
-                            // which points to the same local codec as the remote one.
-                            if (!rtxCapabilityMatches(lCodec, rCodec,
-                                    localCapabilities.codecs, remoteCapabilities.codecs)) {
-                                continue;
-                            }
-                        }
-                        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy
-                        // number of channels is the highest common number of channels
-                        rCodec.numChannels = Math.min(lCodec.numChannels,
-                            rCodec.numChannels);
-                        // push rCodec so we reply with offerer payload type
-                        commonCapabilities.codecs.push(rCodec);
-
-                        // determine common feedback mechanisms
-                        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {
-                            for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {
-                                if (lCodec.rtcpFeedback[j].type === fb.type &&
-                                    lCodec.rtcpFeedback[j].parameter === fb.parameter) {
-                                    return true;
-                                }
-                            }
-                            return false;
-                        });
-                        // FIXME: also need to determine .parameters
-                        //  see https://github.com/openpeer/ortc/issues/569
-                        break;
-                    }
-                }
-            });
-
-            localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {
-                for (var i = 0; i < remoteCapabilities.headerExtensions.length;
-                     i++) {
-                    var rHeaderExtension = remoteCapabilities.headerExtensions[i];
-                    if (lHeaderExtension.uri === rHeaderExtension.uri) {
-                        commonCapabilities.headerExtensions.push(rHeaderExtension);
-                        break;
-                    }
-                }
-            });
-
-            // FIXME: fecMechanisms
-            return commonCapabilities;
-        }
-
-        // is action=setLocalDescription with type allowed in signalingState
-        function isActionAllowedInSignalingState(action, type, signalingState) {
-            return {
-                offer: {
-                    setLocalDescription: ['stable', 'have-local-offer'],
-                    setRemoteDescription: ['stable', 'have-remote-offer']
-                },
-                answer: {
-                    setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],
-                    setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']
-                }
-            }[type][action].indexOf(signalingState) !== -1;
-        }
-
-        function maybeAddCandidate(iceTransport, candidate) {
-            // Edge's internal representation adds some fields therefore
-            // not all fieldѕ are taken into account.
-            var alreadyAdded = iceTransport.getRemoteCandidates()
-                .find(function(remoteCandidate) {
-                    return candidate.foundation === remoteCandidate.foundation &&
-                        candidate.ip === remoteCandidate.ip &&
-                        candidate.port === remoteCandidate.port &&
-                        candidate.priority === remoteCandidate.priority &&
-                        candidate.protocol === remoteCandidate.protocol &&
-                        candidate.type === remoteCandidate.type;
-                });
-            if (!alreadyAdded) {
-                iceTransport.addRemoteCandidate(candidate);
-            }
-            return !alreadyAdded;
-        }
-
-
-        function makeError(name, description) {
-            var e = new Error(description);
-            e.name = name;
-            // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names
-            e.code = {
-                NotSupportedError: 9,
-                InvalidStateError: 11,
-                InvalidAccessError: 15,
-                TypeError: undefined,
-                OperationError: undefined
-            }[name];
-            return e;
-        }
-
-        module.exports = function(window, edgeVersion) {
-            // https://w3c.github.io/mediacapture-main/#mediastream
-            // Helper function to add the track to the stream and
-            // dispatch the event ourselves.
-            function addTrackToStreamAndFireEvent(track, stream) {
-                stream.addTrack(track);
-                stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack',
-                    {track: track}));
-            }
-
-            function removeTrackFromStreamAndFireEvent(track, stream) {
-                stream.removeTrack(track);
-                stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack',
-                    {track: track}));
-            }
-
-            function fireAddTrack(pc, track, receiver, streams) {
-                var trackEvent = new Event('track');
-                trackEvent.track = track;
-                trackEvent.receiver = receiver;
-                trackEvent.transceiver = {receiver: receiver};
-                trackEvent.streams = streams;
-                window.setTimeout(function() {
-                    pc._dispatchEvent('track', trackEvent);
-                });
-            }
-
-            var RTCPeerConnection = function(config) {
-                var pc = this;
-
-                var _eventTarget = document.createDocumentFragment();
-                ['addEventListener', 'removeEventListener', 'dispatchEvent']
-                    .forEach(function(method) {
-                        pc[method] = _eventTarget[method].bind(_eventTarget);
-                    });
-
-                this.canTrickleIceCandidates = null;
-
-                this.needNegotiation = false;
-
-                this.localStreams = [];
-                this.remoteStreams = [];
-
-                this._localDescription = null;
-                this._remoteDescription = null;
-
-                this.signalingState = 'stable';
-                this.iceConnectionState = 'new';
-                this.connectionState = 'new';
-                this.iceGatheringState = 'new';
-
-                config = JSON.parse(JSON.stringify(config || {}));
-
-                this.usingBundle = config.bundlePolicy === 'max-bundle';
-                if (config.rtcpMuxPolicy === 'negotiate') {
-                    throw(makeError('NotSupportedError',
-                        'rtcpMuxPolicy \'negotiate\' is not supported'));
-                } else if (!config.rtcpMuxPolicy) {
-                    config.rtcpMuxPolicy = 'require';
-                }
-
-                switch (config.iceTransportPolicy) {
-                    case 'all':
-                    case 'relay':
-                        break;
-                    default:
-                        config.iceTransportPolicy = 'all';
-                        break;
-                }
-
-                switch (config.bundlePolicy) {
-                    case 'balanced':
-                    case 'max-compat':
-                    case 'max-bundle':
-                        break;
-                    default:
-                        config.bundlePolicy = 'balanced';
-                        break;
-                }
-
-                config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);
-
-                this._iceGatherers = [];
-                if (config.iceCandidatePoolSize) {
-                    for (var i = config.iceCandidatePoolSize; i > 0; i--) {
-                        this._iceGatherers.push(new window.RTCIceGatherer({
-                            iceServers: config.iceServers,
-                            gatherPolicy: config.iceTransportPolicy
-                        }));
-                    }
-                } else {
-                    config.iceCandidatePoolSize = 0;
-                }
-
-                this._config = config;
-
-                // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...
-                // everything that is needed to describe a SDP m-line.
-                this.transceivers = [];
-
-                this._sdpSessionId = SDPUtils.generateSessionId();
-                this._sdpSessionVersion = 0;
-
-                this._dtlsRole = undefined; // role for a=setup to use in answers.
-
-                this._isClosed = false;
-            };
-
-            Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {
-                configurable: true,
-                get: function() {
-                    return this._localDescription;
-                }
-            });
-            Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {
-                configurable: true,
-                get: function() {
-                    return this._remoteDescription;
-                }
-            });
-
-            // set up event handlers on prototype
-            RTCPeerConnection.prototype.onicecandidate = null;
-            RTCPeerConnection.prototype.onaddstream = null;
-            RTCPeerConnection.prototype.ontrack = null;
-            RTCPeerConnection.prototype.onremovestream = null;
-            RTCPeerConnection.prototype.onsignalingstatechange = null;
-            RTCPeerConnection.prototype.oniceconnectionstatechange = null;
-            RTCPeerConnection.prototype.onconnectionstatechange = null;
-            RTCPeerConnection.prototype.onicegatheringstatechange = null;
-            RTCPeerConnection.prototype.onnegotiationneeded = null;
-            RTCPeerConnection.prototype.ondatachannel = null;
-
-            RTCPeerConnection.prototype._dispatchEvent = function(name, event) {
-                if (this._isClosed) {
-                    return;
-                }
-                this.dispatchEvent(event);
-                if (typeof this['on' + name] === 'function') {
-                    this['on' + name](event);
-                }
-            };
-
-            RTCPeerConnection.prototype._emitGatheringStateChange = function() {
-                var event = new Event('icegatheringstatechange');
-                this._dispatchEvent('icegatheringstatechange', event);
-            };
-
-            RTCPeerConnection.prototype.getConfiguration = function() {
-                return this._config;
-            };
-
-            RTCPeerConnection.prototype.getLocalStreams = function() {
-                return this.localStreams;
-            };
-
-            RTCPeerConnection.prototype.getRemoteStreams = function() {
-                return this.remoteStreams;
-            };
-
-            // internal helper to create a transceiver object.
-            // (which is not yet the same as the WebRTC 1.0 transceiver)
-            RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {
-                var hasBundleTransport = this.transceivers.length > 0;
-                var transceiver = {
-                    track: null,
-                    iceGatherer: null,
-                    iceTransport: null,
-                    dtlsTransport: null,
-                    localCapabilities: null,
-                    remoteCapabilities: null,
-                    rtpSender: null,
-                    rtpReceiver: null,
-                    kind: kind,
-                    mid: null,
-                    sendEncodingParameters: null,
-                    recvEncodingParameters: null,
-                    stream: null,
-                    associatedRemoteMediaStreams: [],
-                    wantReceive: true
-                };
-                if (this.usingBundle && hasBundleTransport) {
-                    transceiver.iceTransport = this.transceivers[0].iceTransport;
-                    transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;
-                } else {
-                    var transports = this._createIceAndDtlsTransports();
-                    transceiver.iceTransport = transports.iceTransport;
-                    transceiver.dtlsTransport = transports.dtlsTransport;
-                }
-                if (!doNotAdd) {
-                    this.transceivers.push(transceiver);
-                }
-                return transceiver;
-            };
-
-            RTCPeerConnection.prototype.addTrack = function(track, stream) {
-                if (this._isClosed) {
-                    throw makeError('InvalidStateError',
-                        'Attempted to call addTrack on a closed peerconnection.');
-                }
-
-                var alreadyExists = this.transceivers.find(function(s) {
-                    return s.track === track;
-                });
-
-                if (alreadyExists) {
-                    throw makeError('InvalidAccessError', 'Track already exists.');
-                }
-
-                var transceiver;
-                for (var i = 0; i < this.transceivers.length; i++) {
-                    if (!this.transceivers[i].track &&
-                        this.transceivers[i].kind === track.kind) {
-                        transceiver = this.transceivers[i];
-                    }
-                }
-                if (!transceiver) {
-                    transceiver = this._createTransceiver(track.kind);
-                }
-
-                this._maybeFireNegotiationNeeded();
-
-                if (this.localStreams.indexOf(stream) === -1) {
-                    this.localStreams.push(stream);
-                }
-
-                transceiver.track = track;
-                transceiver.stream = stream;
-                transceiver.rtpSender = new window.RTCRtpSender(track,
-                    transceiver.dtlsTransport);
-                return transceiver.rtpSender;
-            };
-
-            RTCPeerConnection.prototype.addStream = function(stream) {
-                var pc = this;
-                if (edgeVersion >= 15025) {
-                    stream.getTracks().forEach(function(track) {
-                        pc.addTrack(track, stream);
-                    });
-                } else {
-                    // Clone is necessary for local demos mostly, attaching directly
-                    // to two different senders does not work (build 10547).
-                    // Fixed in 15025 (or earlier)
-                    var clonedStream = stream.clone();
-                    stream.getTracks().forEach(function(track, idx) {
-                        var clonedTrack = clonedStream.getTracks()[idx];
-                        track.addEventListener('enabled', function(event) {
-                            clonedTrack.enabled = event.enabled;
-                        });
-                    });
-                    clonedStream.getTracks().forEach(function(track) {
-                        pc.addTrack(track, clonedStream);
-                    });
-                }
-            };
-
-            RTCPeerConnection.prototype.removeTrack = function(sender) {
-                if (this._isClosed) {
-                    throw makeError('InvalidStateError',
-                        'Attempted to call removeTrack on a closed peerconnection.');
-                }
-
-                if (!(sender instanceof window.RTCRtpSender)) {
-                    throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' +
-                        'does not implement interface RTCRtpSender.');
-                }
-
-                var transceiver = this.transceivers.find(function(t) {
-                    return t.rtpSender === sender;
-                });
-
-                if (!transceiver) {
-                    throw makeError('InvalidAccessError',
-                        'Sender was not created by this connection.');
-                }
-                var stream = transceiver.stream;
-
-                transceiver.rtpSender.stop();
-                transceiver.rtpSender = null;
-                transceiver.track = null;
-                transceiver.stream = null;
-
-                // remove the stream from the set of local streams
-                var localStreams = this.transceivers.map(function(t) {
-                    return t.stream;
-                });
-                if (localStreams.indexOf(stream) === -1 &&
-                    this.localStreams.indexOf(stream) > -1) {
-                    this.localStreams.splice(this.localStreams.indexOf(stream), 1);
-                }
-
-                this._maybeFireNegotiationNeeded();
-            };
-
-            RTCPeerConnection.prototype.removeStream = function(stream) {
-                var pc = this;
-                stream.getTracks().forEach(function(track) {
-                    var sender = pc.getSenders().find(function(s) {
-                        return s.track === track;
-                    });
-                    if (sender) {
-                        pc.removeTrack(sender);
-                    }
-                });
-            };
-
-            RTCPeerConnection.prototype.getSenders = function() {
-                return this.transceivers.filter(function(transceiver) {
-                    return !!transceiver.rtpSender;
-                })
-                    .map(function(transceiver) {
-                        return transceiver.rtpSender;
-                    });
-            };
-
-            RTCPeerConnection.prototype.getReceivers = function() {
-                return this.transceivers.filter(function(transceiver) {
-                    return !!transceiver.rtpReceiver;
-                })
-                    .map(function(transceiver) {
-                        return transceiver.rtpReceiver;
-                    });
-            };
-
-
-            RTCPeerConnection.prototype._createIceGatherer = function(sdpMLineIndex,
-                                                                      usingBundle) {
-                var pc = this;
-                if (usingBundle && sdpMLineIndex > 0) {
-                    return this.transceivers[0].iceGatherer;
-                } else if (this._iceGatherers.length) {
-                    return this._iceGatherers.shift();
-                }
-                var iceGatherer = new window.RTCIceGatherer({
-                    iceServers: this._config.iceServers,
-                    gatherPolicy: this._config.iceTransportPolicy
-                });
-                Object.defineProperty(iceGatherer, 'state',
-                    {value: 'new', writable: true}
-                );
-
-                this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];
-                this.transceivers[sdpMLineIndex].bufferCandidates = function(event) {
-                    var end = !event.candidate || Object.keys(event.candidate).length === 0;
-                    // polyfill since RTCIceGatherer.state is not implemented in
-                    // Edge 10547 yet.
-                    iceGatherer.state = end ? 'completed' : 'gathering';
-                    if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {
-                        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);
-                    }
-                };
-                iceGatherer.addEventListener('localcandidate',
-                    this.transceivers[sdpMLineIndex].bufferCandidates);
-                return iceGatherer;
-            };
-
-            // start gathering from an RTCIceGatherer.
-            RTCPeerConnection.prototype._gather = function(mid, sdpMLineIndex) {
-                var pc = this;
-                var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
-                if (iceGatherer.onlocalcandidate) {
-                    return;
-                }
-                var bufferedCandidateEvents =
-                    this.transceivers[sdpMLineIndex].bufferedCandidateEvents;
-                this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;
-                iceGatherer.removeEventListener('localcandidate',
-                    this.transceivers[sdpMLineIndex].bufferCandidates);
-                iceGatherer.onlocalcandidate = function(evt) {
-                    if (pc.usingBundle && sdpMLineIndex > 0) {
-                        // if we know that we use bundle we can drop candidates with
-                        // ѕdpMLineIndex > 0. If we don't do this then our state gets
-                        // confused since we dispose the extra ice gatherer.
-                        return;
-                    }
-                    var event = new Event('icecandidate');
-                    event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};
-
-                    var cand = evt.candidate;
-                    // Edge emits an empty object for RTCIceCandidateComplete‥
-                    var end = !cand || Object.keys(cand).length === 0;
-                    if (end) {
-                        // polyfill since RTCIceGatherer.state is not implemented in
-                        // Edge 10547 yet.
-                        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {
-                            iceGatherer.state = 'completed';
-                        }
-                    } else {
-                        if (iceGatherer.state === 'new') {
-                            iceGatherer.state = 'gathering';
-                        }
-                        // RTCIceCandidate doesn't have a component, needs to be added
-                        cand.component = 1;
-                        // also the usernameFragment. TODO: update SDP to take both variants.
-                        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;
-
-                        var serializedCandidate = SDPUtils.writeCandidate(cand);
-                        event.candidate = Object.assign(event.candidate,
-                            SDPUtils.parseCandidate(serializedCandidate));
-
-                        event.candidate.candidate = serializedCandidate;
-                        event.candidate.toJSON = function() {
-                            return {
-                                candidate: event.candidate.candidate,
-                                sdpMid: event.candidate.sdpMid,
-                                sdpMLineIndex: event.candidate.sdpMLineIndex,
-                                usernameFragment: event.candidate.usernameFragment
-                            };
-                        };
-                    }
-
-                    // update local description.
-                    var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);
-                    if (!end) {
-                        sections[event.candidate.sdpMLineIndex] +=
-                            'a=' + event.candidate.candidate + '\r\n';
-                    } else {
-                        sections[event.candidate.sdpMLineIndex] +=
-                            'a=end-of-candidates\r\n';
-                    }
-                    pc._localDescription.sdp =
-                        SDPUtils.getDescription(pc._localDescription.sdp) +
-                        sections.join('');
-                    var complete = pc.transceivers.every(function(transceiver) {
-                        return transceiver.iceGatherer &&
-                            transceiver.iceGatherer.state === 'completed';
-                    });
-
-                    if (pc.iceGatheringState !== 'gathering') {
-                        pc.iceGatheringState = 'gathering';
-                        pc._emitGatheringStateChange();
-                    }
-
-                    // Emit candidate. Also emit null candidate when all gatherers are
-                    // complete.
-                    if (!end) {
-                        pc._dispatchEvent('icecandidate', event);
-                    }
-                    if (complete) {
-                        pc._dispatchEvent('icecandidate', new Event('icecandidate'));
-                        pc.iceGatheringState = 'complete';
-                        pc._emitGatheringStateChange();
-                    }
-                };
-
-                // emit already gathered candidates.
-                window.setTimeout(function() {
-                    bufferedCandidateEvents.forEach(function(e) {
-                        iceGatherer.onlocalcandidate(e);
-                    });
-                }, 0);
-            };
-
-            // Create ICE transport and DTLS transport.
-            RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {
-                var pc = this;
-                var iceTransport = new window.RTCIceTransport(null);
-                iceTransport.onicestatechange = function() {
-                    pc._updateIceConnectionState();
-                    pc._updateConnectionState();
-                };
-
-                var dtlsTransport = new window.RTCDtlsTransport(iceTransport);
-                dtlsTransport.ondtlsstatechange = function() {
-                    pc._updateConnectionState();
-                };
-                dtlsTransport.onerror = function() {
-                    // onerror does not set state to failed by itself.
-                    Object.defineProperty(dtlsTransport, 'state',
-                        {value: 'failed', writable: true});
-                    pc._updateConnectionState();
-                };
-
-                return {
-                    iceTransport: iceTransport,
-                    dtlsTransport: dtlsTransport
-                };
-            };
-
-            // Destroy ICE gatherer, ICE transport and DTLS transport.
-            // Without triggering the callbacks.
-            RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(
-                sdpMLineIndex) {
-                var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
-                if (iceGatherer) {
-                    delete iceGatherer.onlocalcandidate;
-                    delete this.transceivers[sdpMLineIndex].iceGatherer;
-                }
-                var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;
-                if (iceTransport) {
-                    delete iceTransport.onicestatechange;
-                    delete this.transceivers[sdpMLineIndex].iceTransport;
-                }
-                var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;
-                if (dtlsTransport) {
-                    delete dtlsTransport.ondtlsstatechange;
-                    delete dtlsTransport.onerror;
-                    delete this.transceivers[sdpMLineIndex].dtlsTransport;
-                }
-            };
-
-            // Start the RTP Sender and Receiver for a transceiver.
-            RTCPeerConnection.prototype._transceive = function(transceiver,
-                                                               send, recv) {
-                var params = getCommonCapabilities(transceiver.localCapabilities,
-                    transceiver.remoteCapabilities);
-                if (send && transceiver.rtpSender) {
-                    params.encodings = transceiver.sendEncodingParameters;
-                    params.rtcp = {
-                        cname: SDPUtils.localCName,
-                        compound: transceiver.rtcpParameters.compound
-                    };
-                    if (transceiver.recvEncodingParameters.length) {
-                        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;
-                    }
-                    transceiver.rtpSender.send(params);
-                }
-                if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {
-                    // remove RTX field in Edge 14942
-                    if (transceiver.kind === 'video'
-                        && transceiver.recvEncodingParameters
-                        && edgeVersion < 15019) {
-                        transceiver.recvEncodingParameters.forEach(function(p) {
-                            delete p.rtx;
-                        });
-                    }
-                    if (transceiver.recvEncodingParameters.length) {
-                        params.encodings = transceiver.recvEncodingParameters;
-                    } else {
-                        params.encodings = [{}];
-                    }
-                    params.rtcp = {
-                        compound: transceiver.rtcpParameters.compound
-                    };
-                    if (transceiver.rtcpParameters.cname) {
-                        params.rtcp.cname = transceiver.rtcpParameters.cname;
-                    }
-                    if (transceiver.sendEncodingParameters.length) {
-                        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;
-                    }
-                    transceiver.rtpReceiver.receive(params);
-                }
-            };
-
-            RTCPeerConnection.prototype.setLocalDescription = function(description) {
-                var pc = this;
-
-                // Note: pranswer is not supported.
-                if (['offer', 'answer'].indexOf(description.type) === -1) {
-                    return Promise.reject(makeError('TypeError',
-                        'Unsupported type "' + description.type + '"'));
-                }
-
-                if (!isActionAllowedInSignalingState('setLocalDescription',
-                        description.type, pc.signalingState) || pc._isClosed) {
-                    return Promise.reject(makeError('InvalidStateError',
-                        'Can not set local ' + description.type +
-                        ' in state ' + pc.signalingState));
-                }
-
-                var sections;
-                var sessionpart;
-                if (description.type === 'offer') {
-                    // VERY limited support for SDP munging. Limited to:
-                    // * changing the order of codecs
-                    sections = SDPUtils.splitSections(description.sdp);
-                    sessionpart = sections.shift();
-                    sections.forEach(function(mediaSection, sdpMLineIndex) {
-                        var caps = SDPUtils.parseRtpParameters(mediaSection);
-                        pc.transceivers[sdpMLineIndex].localCapabilities = caps;
-                    });
-
-                    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
-                        pc._gather(transceiver.mid, sdpMLineIndex);
-                    });
-                } else if (description.type === 'answer') {
-                    sections = SDPUtils.splitSections(pc._remoteDescription.sdp);
-                    sessionpart = sections.shift();
-                    var isIceLite = SDPUtils.matchPrefix(sessionpart,
-                        'a=ice-lite').length > 0;
-                    sections.forEach(function(mediaSection, sdpMLineIndex) {
-                        var transceiver = pc.transceivers[sdpMLineIndex];
-                        var iceGatherer = transceiver.iceGatherer;
-                        var iceTransport = transceiver.iceTransport;
-                        var dtlsTransport = transceiver.dtlsTransport;
-                        var localCapabilities = transceiver.localCapabilities;
-                        var remoteCapabilities = transceiver.remoteCapabilities;
-
-                        // treat bundle-only as not-rejected.
-                        var rejected = SDPUtils.isRejected(mediaSection) &&
-                            SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;
-
-                        if (!rejected && !transceiver.rejected) {
-                            var remoteIceParameters = SDPUtils.getIceParameters(
-                                mediaSection, sessionpart);
-                            var remoteDtlsParameters = SDPUtils.getDtlsParameters(
-                                mediaSection, sessionpart);
-                            if (isIceLite) {
-                                remoteDtlsParameters.role = 'server';
-                            }
-
-                            if (!pc.usingBundle || sdpMLineIndex === 0) {
-                                pc._gather(transceiver.mid, sdpMLineIndex);
-                                if (iceTransport.state === 'new') {
-                                    iceTransport.start(iceGatherer, remoteIceParameters,
-                                        isIceLite ? 'controlling' : 'controlled');
-                                }
-                                if (dtlsTransport.state === 'new') {
-                                    dtlsTransport.start(remoteDtlsParameters);
-                                }
-                            }
-
-                            // Calculate intersection of capabilities.
-                            var params = getCommonCapabilities(localCapabilities,
-                                remoteCapabilities);
-
-                            // Start the RTCRtpSender. The RTCRtpReceiver for this
-                            // transceiver has already been started in setRemoteDescription.
-                            pc._transceive(transceiver,
-                                params.codecs.length > 0,
-                                false);
-                        }
-                    });
-                }
-
-                pc._localDescription = {
-                    type: description.type,
-                    sdp: description.sdp
-                };
-                if (description.type === 'offer') {
-                    pc._updateSignalingState('have-local-offer');
-                } else {
-                    pc._updateSignalingState('stable');
-                }
-
-                return Promise.resolve();
-            };
-
-            RTCPeerConnection.prototype.setRemoteDescription = function(description) {
-                var pc = this;
-
-                // Note: pranswer is not supported.
-                if (['offer', 'answer'].indexOf(description.type) === -1) {
-                    return Promise.reject(makeError('TypeError',
-                        'Unsupported type "' + description.type + '"'));
-                }
-
-                if (!isActionAllowedInSignalingState('setRemoteDescription',
-                        description.type, pc.signalingState) || pc._isClosed) {
-                    return Promise.reject(makeError('InvalidStateError',
-                        'Can not set remote ' + description.type +
-                        ' in state ' + pc.signalingState));
-                }
-
-                var streams = {};
-                pc.remoteStreams.forEach(function(stream) {
-                    streams[stream.id] = stream;
-                });
-                var receiverList = [];
-                var sections = SDPUtils.splitSections(description.sdp);
-                var sessionpart = sections.shift();
-                var isIceLite = SDPUtils.matchPrefix(sessionpart,
-                    'a=ice-lite').length > 0;
-                var usingBundle = SDPUtils.matchPrefix(sessionpart,
-                    'a=group:BUNDLE ').length > 0;
-                pc.usingBundle = usingBundle;
-                var iceOptions = SDPUtils.matchPrefix(sessionpart,
-                    'a=ice-options:')[0];
-                if (iceOptions) {
-                    pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ')
-                        .indexOf('trickle') >= 0;
-                } else {
-                    pc.canTrickleIceCandidates = false;
-                }
-
-                sections.forEach(function(mediaSection, sdpMLineIndex) {
-                    var lines = SDPUtils.splitLines(mediaSection);
-                    var kind = SDPUtils.getKind(mediaSection);
-                    // treat bundle-only as not-rejected.
-                    var rejected = SDPUtils.isRejected(mediaSection) &&
-                        SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;
-                    var protocol = lines[0].substr(2).split(' ')[2];
-
-                    var direction = SDPUtils.getDirection(mediaSection, sessionpart);
-                    var remoteMsid = SDPUtils.parseMsid(mediaSection);
-
-                    var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();
-
-                    // Reject datachannels which are not implemented yet.
-                    if (rejected || (kind === 'application' && (protocol === 'DTLS/SCTP' ||
-                            protocol === 'UDP/DTLS/SCTP'))) {
-                        // TODO: this is dangerous in the case where a non-rejected m-line
-                        //     becomes rejected.
-                        pc.transceivers[sdpMLineIndex] = {
-                            mid: mid,
-                            kind: kind,
-                            protocol: protocol,
-                            rejected: true
-                        };
-                        return;
-                    }
-
-                    if (!rejected && pc.transceivers[sdpMLineIndex] &&
-                        pc.transceivers[sdpMLineIndex].rejected) {
-                        // recycle a rejected transceiver.
-                        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);
-                    }
-
-                    var transceiver;
-                    var iceGatherer;
-                    var iceTransport;
-                    var dtlsTransport;
-                    var rtpReceiver;
-                    var sendEncodingParameters;
-                    var recvEncodingParameters;
-                    var localCapabilities;
-
-                    var track;
-                    // FIXME: ensure the mediaSection has rtcp-mux set.
-                    var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);
-                    var remoteIceParameters;
-                    var remoteDtlsParameters;
-                    if (!rejected) {
-                        remoteIceParameters = SDPUtils.getIceParameters(mediaSection,
-                            sessionpart);
-                        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,
-                            sessionpart);
-                        remoteDtlsParameters.role = 'client';
-                    }
-                    recvEncodingParameters =
-                        SDPUtils.parseRtpEncodingParameters(mediaSection);
-
-                    var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);
-
-                    var isComplete = SDPUtils.matchPrefix(mediaSection,
-                        'a=end-of-candidates', sessionpart).length > 0;
-                    var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')
-                        .map(function(cand) {
-                            return SDPUtils.parseCandidate(cand);
-                        })
-                        .filter(function(cand) {
-                            return cand.component === 1;
-                        });
-
-                    // Check if we can use BUNDLE and dispose transports.
-                    if ((description.type === 'offer' || description.type === 'answer') &&
-                        !rejected && usingBundle && sdpMLineIndex > 0 &&
-                        pc.transceivers[sdpMLineIndex]) {
-                        pc._disposeIceAndDtlsTransports(sdpMLineIndex);
-                        pc.transceivers[sdpMLineIndex].iceGatherer =
-                            pc.transceivers[0].iceGatherer;
-                        pc.transceivers[sdpMLineIndex].iceTransport =
-                            pc.transceivers[0].iceTransport;
-                        pc.transceivers[sdpMLineIndex].dtlsTransport =
-                            pc.transceivers[0].dtlsTransport;
-                        if (pc.transceivers[sdpMLineIndex].rtpSender) {
-                            pc.transceivers[sdpMLineIndex].rtpSender.setTransport(
-                                pc.transceivers[0].dtlsTransport);
-                        }
-                        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {
-                            pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(
-                                pc.transceivers[0].dtlsTransport);
-                        }
-                    }
-                    if (description.type === 'offer' && !rejected) {
-                        transceiver = pc.transceivers[sdpMLineIndex] ||
-                            pc._createTransceiver(kind);
-                        transceiver.mid = mid;
-
-                        if (!transceiver.iceGatherer) {
-                            transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,
-                                usingBundle);
-                        }
-
-                        if (cands.length && transceiver.iceTransport.state === 'new') {
-                            if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {
-                                transceiver.iceTransport.setRemoteCandidates(cands);
-                            } else {
-                                cands.forEach(function(candidate) {
-                                    maybeAddCandidate(transceiver.iceTransport, candidate);
-                                });
-                            }
-                        }
-
-                        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);
-
-                        // filter RTX until additional stuff needed for RTX is implemented
-                        // in adapter.js
-                        if (edgeVersion < 15019) {
-                            localCapabilities.codecs = localCapabilities.codecs.filter(
-                                function(codec) {
-                                    return codec.name !== 'rtx';
-                                });
-                        }
-
-                        sendEncodingParameters = transceiver.sendEncodingParameters || [{
-                            ssrc: (2 * sdpMLineIndex + 2) * 1001
-                        }];
-
-                        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams
-                        var isNewTrack = false;
-                        if (direction === 'sendrecv' || direction === 'sendonly') {
-                            isNewTrack = !transceiver.rtpReceiver;
-                            rtpReceiver = transceiver.rtpReceiver ||
-                                new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);
-
-                            if (isNewTrack) {
-                                var stream;
-                                track = rtpReceiver.track;
-                                // FIXME: does not work with Plan B.
-                                if (remoteMsid && remoteMsid.stream === '-') {
-                                    // no-op. a stream id of '-' means: no associated stream.
-                                } else if (remoteMsid) {
-                                    if (!streams[remoteMsid.stream]) {
-                                        streams[remoteMsid.stream] = new window.MediaStream();
-                                        Object.defineProperty(streams[remoteMsid.stream], 'id', {
-                                            get: function() {
-                                                return remoteMsid.stream;
-                                            }
-                                        });
-                                    }
-                                    Object.defineProperty(track, 'id', {
-                                        get: function() {
-                                            return remoteMsid.track;
-                                        }
-                                    });
-                                    stream = streams[remoteMsid.stream];
-                                } else {
-                                    if (!streams.default) {
-                                        streams.default = new window.MediaStream();
-                                    }
-                                    stream = streams.default;
-                                }
-                                if (stream) {
-                                    addTrackToStreamAndFireEvent(track, stream);
-                                    transceiver.associatedRemoteMediaStreams.push(stream);
-                                }
-                                receiverList.push([track, rtpReceiver, stream]);
-                            }
-                        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {
-                            transceiver.associatedRemoteMediaStreams.forEach(function(s) {
-                                var nativeTrack = s.getTracks().find(function(t) {
-                                    return t.id === transceiver.rtpReceiver.track.id;
-                                });
-                                if (nativeTrack) {
-                                    removeTrackFromStreamAndFireEvent(nativeTrack, s);
-                                }
-                            });
-                            transceiver.associatedRemoteMediaStreams = [];
-                        }
-
-                        transceiver.localCapabilities = localCapabilities;
-                        transceiver.remoteCapabilities = remoteCapabilities;
-                        transceiver.rtpReceiver = rtpReceiver;
-                        transceiver.rtcpParameters = rtcpParameters;
-                        transceiver.sendEncodingParameters = sendEncodingParameters;
-                        transceiver.recvEncodingParameters = recvEncodingParameters;
-
-                        // Start the RTCRtpReceiver now. The RTPSender is started in
-                        // setLocalDescription.
-                        pc._transceive(pc.transceivers[sdpMLineIndex],
-                            false,
-                            isNewTrack);
-                    } else if (description.type === 'answer' && !rejected) {
-                        transceiver = pc.transceivers[sdpMLineIndex];
-                        iceGatherer = transceiver.iceGatherer;
-                        iceTransport = transceiver.iceTransport;
-                        dtlsTransport = transceiver.dtlsTransport;
-                        rtpReceiver = transceiver.rtpReceiver;
-                        sendEncodingParameters = transceiver.sendEncodingParameters;
-                        localCapabilities = transceiver.localCapabilities;
-
-                        pc.transceivers[sdpMLineIndex].recvEncodingParameters =
-                            recvEncodingParameters;
-                        pc.transceivers[sdpMLineIndex].remoteCapabilities =
-                            remoteCapabilities;
-                        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;
-
-                        if (cands.length && iceTransport.state === 'new') {
-                            if ((isIceLite || isComplete) &&
-                                (!usingBundle || sdpMLineIndex === 0)) {
-                                iceTransport.setRemoteCandidates(cands);
-                            } else {
-                                cands.forEach(function(candidate) {
-                                    maybeAddCandidate(transceiver.iceTransport, candidate);
-                                });
-                            }
-                        }
-
-                        if (!usingBundle || sdpMLineIndex === 0) {
-                            if (iceTransport.state === 'new') {
-                                iceTransport.start(iceGatherer, remoteIceParameters,
-                                    'controlling');
-                            }
-                            if (dtlsTransport.state === 'new') {
-                                dtlsTransport.start(remoteDtlsParameters);
-                            }
-                        }
-
-                        // If the offer contained RTX but the answer did not,
-                        // remove RTX from sendEncodingParameters.
-                        var commonCapabilities = getCommonCapabilities(
-                            transceiver.localCapabilities,
-                            transceiver.remoteCapabilities);
-
-                        var hasRtx = commonCapabilities.codecs.filter(function(c) {
-                            return c.name.toLowerCase() === 'rtx';
-                        }).length;
-                        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
-                            delete transceiver.sendEncodingParameters[0].rtx;
-                        }
-
-                        pc._transceive(transceiver,
-                            direction === 'sendrecv' || direction === 'recvonly',
-                            direction === 'sendrecv' || direction === 'sendonly');
-
-                        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams
-                        if (rtpReceiver &&
-                            (direction === 'sendrecv' || direction === 'sendonly')) {
-                            track = rtpReceiver.track;
-                            if (remoteMsid) {
-                                if (!streams[remoteMsid.stream]) {
-                                    streams[remoteMsid.stream] = new window.MediaStream();
-                                }
-                                addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);
-                                receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);
-                            } else {
-                                if (!streams.default) {
-                                    streams.default = new window.MediaStream();
-                                }
-                                addTrackToStreamAndFireEvent(track, streams.default);
-                                receiverList.push([track, rtpReceiver, streams.default]);
-                            }
-                        } else {
-                            // FIXME: actually the receiver should be created later.
-                            delete transceiver.rtpReceiver;
-                        }
-                    }
-                });
-
-                if (pc._dtlsRole === undefined) {
-                    pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';
-                }
-
-                pc._remoteDescription = {
-                    type: description.type,
-                    sdp: description.sdp
-                };
-                if (description.type === 'offer') {
-                    pc._updateSignalingState('have-remote-offer');
-                } else {
-                    pc._updateSignalingState('stable');
-                }
-                Object.keys(streams).forEach(function(sid) {
-                    var stream = streams[sid];
-                    if (stream.getTracks().length) {
-                        if (pc.remoteStreams.indexOf(stream) === -1) {
-                            pc.remoteStreams.push(stream);
-                            var event = new Event('addstream');
-                            event.stream = stream;
-                            window.setTimeout(function() {
-                                pc._dispatchEvent('addstream', event);
-                            });
-                        }
-
-                        receiverList.forEach(function(item) {
-                            var track = item[0];
-                            var receiver = item[1];
-                            if (stream.id !== item[2].id) {
-                                return;
-                            }
-                            fireAddTrack(pc, track, receiver, [stream]);
-                        });
-                    }
-                });
-                receiverList.forEach(function(item) {
-                    if (item[2]) {
-                        return;
-                    }
-                    fireAddTrack(pc, item[0], item[1], []);
-                });
-
-                // check whether addIceCandidate({}) was called within four seconds after
-                // setRemoteDescription.
-                window.setTimeout(function() {
-                    if (!(pc && pc.transceivers)) {
-                        return;
-                    }
-                    pc.transceivers.forEach(function(transceiver) {
-                        if (transceiver.iceTransport &&
-                            transceiver.iceTransport.state === 'new' &&
-                            transceiver.iceTransport.getRemoteCandidates().length > 0) {
-                            console.warn('Timeout for addRemoteCandidate. Consider sending ' +
-                                'an end-of-candidates notification');
-                            transceiver.iceTransport.addRemoteCandidate({});
-                        }
-                    });
-                }, 4000);
-
-                return Promise.resolve();
-            };
-
-            RTCPeerConnection.prototype.close = function() {
-                this.transceivers.forEach(function(transceiver) {
-                    /* not yet
-                    if (transceiver.iceGatherer) {
-                        transceiver.iceGatherer.close();
-                    }
-                    */
-                    if (transceiver.iceTransport) {
-                        transceiver.iceTransport.stop();
-                    }
-                    if (transceiver.dtlsTransport) {
-                        transceiver.dtlsTransport.stop();
-                    }
-                    if (transceiver.rtpSender) {
-                        transceiver.rtpSender.stop();
-                    }
-                    if (transceiver.rtpReceiver) {
-                        transceiver.rtpReceiver.stop();
-                    }
-                });
-                // FIXME: clean up tracks, local streams, remote streams, etc
-                this._isClosed = true;
-                this._updateSignalingState('closed');
-            };
-
-            // Update the signaling state.
-            RTCPeerConnection.prototype._updateSignalingState = function(newState) {
-                this.signalingState = newState;
-                var event = new Event('signalingstatechange');
-                this._dispatchEvent('signalingstatechange', event);
-            };
-
-            // Determine whether to fire the negotiationneeded event.
-            RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {
-                var pc = this;
-                if (this.signalingState !== 'stable' || this.needNegotiation === true) {
-                    return;
-                }
-                this.needNegotiation = true;
-                window.setTimeout(function() {
-                    if (pc.needNegotiation) {
-                        pc.needNegotiation = false;
-                        var event = new Event('negotiationneeded');
-                        pc._dispatchEvent('negotiationneeded', event);
-                    }
-                }, 0);
-            };
-
-            // Update the ice connection state.
-            RTCPeerConnection.prototype._updateIceConnectionState = function() {
-                var newState;
-                var states = {
-                    'new': 0,
-                    closed: 0,
-                    checking: 0,
-                    connected: 0,
-                    completed: 0,
-                    disconnected: 0,
-                    failed: 0
-                };
-                this.transceivers.forEach(function(transceiver) {
-                    states[transceiver.iceTransport.state]++;
-                });
-
-                newState = 'new';
-                if (states.failed > 0) {
-                    newState = 'failed';
-                } else if (states.checking > 0) {
-                    newState = 'checking';
-                } else if (states.disconnected > 0) {
-                    newState = 'disconnected';
-                } else if (states.new > 0) {
-                    newState = 'new';
-                } else if (states.connected > 0) {
-                    newState = 'connected';
-                } else if (states.completed > 0) {
-                    newState = 'completed';
-                }
-
-                if (newState !== this.iceConnectionState) {
-                    this.iceConnectionState = newState;
-                    var event = new Event('iceconnectionstatechange');
-                    this._dispatchEvent('iceconnectionstatechange', event);
-                }
-            };
-
-            // Update the connection state.
-            RTCPeerConnection.prototype._updateConnectionState = function() {
-                var newState;
-                var states = {
-                    'new': 0,
-                    closed: 0,
-                    connecting: 0,
-                    connected: 0,
-                    completed: 0,
-                    disconnected: 0,
-                    failed: 0
-                };
-                this.transceivers.forEach(function(transceiver) {
-                    states[transceiver.iceTransport.state]++;
-                    states[transceiver.dtlsTransport.state]++;
-                });
-                // ICETransport.completed and connected are the same for this purpose.
-                states.connected += states.completed;
-
-                newState = 'new';
-                if (states.failed > 0) {
-                    newState = 'failed';
-                } else if (states.connecting > 0) {
-                    newState = 'connecting';
-                } else if (states.disconnected > 0) {
-                    newState = 'disconnected';
-                } else if (states.new > 0) {
-                    newState = 'new';
-                } else if (states.connected > 0) {
-                    newState = 'connected';
-                }
-
-                if (newState !== this.connectionState) {
-                    this.connectionState = newState;
-                    var event = new Event('connectionstatechange');
-                    this._dispatchEvent('connectionstatechange', event);
-                }
-            };
-
-            RTCPeerConnection.prototype.createOffer = function() {
-                var pc = this;
-
-                if (pc._isClosed) {
-                    return Promise.reject(makeError('InvalidStateError',
-                        'Can not call createOffer after close'));
-                }
-
-                var numAudioTracks = pc.transceivers.filter(function(t) {
-                    return t.kind === 'audio';
-                }).length;
-                var numVideoTracks = pc.transceivers.filter(function(t) {
-                    return t.kind === 'video';
-                }).length;
-
-                // Determine number of audio and video tracks we need to send/recv.
-                var offerOptions = arguments[0];
-                if (offerOptions) {
-                    // Reject Chrome legacy constraints.
-                    if (offerOptions.mandatory || offerOptions.optional) {
-                        throw new TypeError(
-                            'Legacy mandatory/optional constraints not supported.');
-                    }
-                    if (offerOptions.offerToReceiveAudio !== undefined) {
-                        if (offerOptions.offerToReceiveAudio === true) {
-                            numAudioTracks = 1;
-                        } else if (offerOptions.offerToReceiveAudio === false) {
-                            numAudioTracks = 0;
-                        } else {
-                            numAudioTracks = offerOptions.offerToReceiveAudio;
-                        }
-                    }
-                    if (offerOptions.offerToReceiveVideo !== undefined) {
-                        if (offerOptions.offerToReceiveVideo === true) {
-                            numVideoTracks = 1;
-                        } else if (offerOptions.offerToReceiveVideo === false) {
-                            numVideoTracks = 0;
-                        } else {
-                            numVideoTracks = offerOptions.offerToReceiveVideo;
-                        }
-                    }
-                }
-
-                pc.transceivers.forEach(function(transceiver) {
-                    if (transceiver.kind === 'audio') {
-                        numAudioTracks--;
-                        if (numAudioTracks < 0) {
-                            transceiver.wantReceive = false;
-                        }
-                    } else if (transceiver.kind === 'video') {
-                        numVideoTracks--;
-                        if (numVideoTracks < 0) {
-                            transceiver.wantReceive = false;
-                        }
-                    }
-                });
-
-                // Create M-lines for recvonly streams.
-                while (numAudioTracks > 0 || numVideoTracks > 0) {
-                    if (numAudioTracks > 0) {
-                        pc._createTransceiver('audio');
-                        numAudioTracks--;
-                    }
-                    if (numVideoTracks > 0) {
-                        pc._createTransceiver('video');
-                        numVideoTracks--;
-                    }
-                }
-
-                var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,
-                    pc._sdpSessionVersion++);
-                pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
-                    // For each track, create an ice gatherer, ice transport,
-                    // dtls transport, potentially rtpsender and rtpreceiver.
-                    var track = transceiver.track;
-                    var kind = transceiver.kind;
-                    var mid = transceiver.mid || SDPUtils.generateIdentifier();
-                    transceiver.mid = mid;
-
-                    if (!transceiver.iceGatherer) {
-                        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,
-                            pc.usingBundle);
-                    }
-
-                    var localCapabilities = window.RTCRtpSender.getCapabilities(kind);
-                    // filter RTX until additional stuff needed for RTX is implemented
-                    // in adapter.js
-                    if (edgeVersion < 15019) {
-                        localCapabilities.codecs = localCapabilities.codecs.filter(
-                            function(codec) {
-                                return codec.name !== 'rtx';
-                            });
-                    }
-                    localCapabilities.codecs.forEach(function(codec) {
-                        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552
-                        // by adding level-asymmetry-allowed=1
-                        if (codec.name === 'H264' &&
-                            codec.parameters['level-asymmetry-allowed'] === undefined) {
-                            codec.parameters['level-asymmetry-allowed'] = '1';
-                        }
-
-                        // for subsequent offers, we might have to re-use the payload
-                        // type of the last offer.
-                        if (transceiver.remoteCapabilities &&
-                            transceiver.remoteCapabilities.codecs) {
-                            transceiver.remoteCapabilities.codecs.forEach(function(remoteCodec) {
-                                if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() &&
-                                    codec.clockRate === remoteCodec.clockRate) {
-                                    codec.preferredPayloadType = remoteCodec.payloadType;
-                                }
-                            });
-                        }
-                    });
-                    localCapabilities.headerExtensions.forEach(function(hdrExt) {
-                        var remoteExtensions = transceiver.remoteCapabilities &&
-                            transceiver.remoteCapabilities.headerExtensions || [];
-                        remoteExtensions.forEach(function(rHdrExt) {
-                            if (hdrExt.uri === rHdrExt.uri) {
-                                hdrExt.id = rHdrExt.id;
-                            }
-                        });
-                    });
-
-                    // generate an ssrc now, to be used later in rtpSender.send
-                    var sendEncodingParameters = transceiver.sendEncodingParameters || [{
-                        ssrc: (2 * sdpMLineIndex + 1) * 1001
-                    }];
-                    if (track) {
-                        // add RTX
-                        if (edgeVersion >= 15019 && kind === 'video' &&
-                            !sendEncodingParameters[0].rtx) {
-                            sendEncodingParameters[0].rtx = {
-                                ssrc: sendEncodingParameters[0].ssrc + 1
-                            };
-                        }
-                    }
-
-                    if (transceiver.wantReceive) {
-                        transceiver.rtpReceiver = new window.RTCRtpReceiver(
-                            transceiver.dtlsTransport, kind);
-                    }
-
-                    transceiver.localCapabilities = localCapabilities;
-                    transceiver.sendEncodingParameters = sendEncodingParameters;
-                });
-
-                // always offer BUNDLE and dispose on return if not supported.
-                if (pc._config.bundlePolicy !== 'max-compat') {
-                    sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {
-                        return t.mid;
-                    }).join(' ') + '\r\n';
-                }
-                sdp += 'a=ice-options:trickle\r\n';
-
-                pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
-                    sdp += writeMediaSection(transceiver, transceiver.localCapabilities,
-                        'offer', transceiver.stream, pc._dtlsRole);
-                    sdp += 'a=rtcp-rsize\r\n';
-
-                    if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' &&
-                        (sdpMLineIndex === 0 || !pc.usingBundle)) {
-                        transceiver.iceGatherer.getLocalCandidates().forEach(function(cand) {
-                            cand.component = 1;
-                            sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\r\n';
-                        });
-
-                        if (transceiver.iceGatherer.state === 'completed') {
-                            sdp += 'a=end-of-candidates\r\n';
-                        }
-                    }
-                });
-
-                var desc = new window.RTCSessionDescription({
-                    type: 'offer',
-                    sdp: sdp
-                });
-                return Promise.resolve(desc);
-            };
-
-            RTCPeerConnection.prototype.createAnswer = function() {
-                var pc = this;
-
-                if (pc._isClosed) {
-                    return Promise.reject(makeError('InvalidStateError',
-                        'Can not call createAnswer after close'));
-                }
-
-                if (!(pc.signalingState === 'have-remote-offer' ||
-                        pc.signalingState === 'have-local-pranswer')) {
-                    return Promise.reject(makeError('InvalidStateError',
-                        'Can not call createAnswer in signalingState ' + pc.signalingState));
-                }
-
-                var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,
-                    pc._sdpSessionVersion++);
-                if (pc.usingBundle) {
-                    sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {
-                        return t.mid;
-                    }).join(' ') + '\r\n';
-                }
-                sdp += 'a=ice-options:trickle\r\n';
-
-                var mediaSectionsInOffer = SDPUtils.getMediaSections(
-                    pc._remoteDescription.sdp).length;
-                pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
-                    if (sdpMLineIndex + 1 > mediaSectionsInOffer) {
-                        return;
-                    }
-                    if (transceiver.rejected) {
-                        if (transceiver.kind === 'application') {
-                            if (transceiver.protocol === 'DTLS/SCTP') { // legacy fmt
-                                sdp += 'm=application 0 DTLS/SCTP 5000\r\n';
-                            } else {
-                                sdp += 'm=application 0 ' + transceiver.protocol +
-                                    ' webrtc-datachannel\r\n';
-                            }
-                        } else if (transceiver.kind === 'audio') {
-                            sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\r\n' +
-                                'a=rtpmap:0 PCMU/8000\r\n';
-                        } else if (transceiver.kind === 'video') {
-                            sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\r\n' +
-                                'a=rtpmap:120 VP8/90000\r\n';
-                        }
-                        sdp += 'c=IN IP4 0.0.0.0\r\n' +
-                            'a=inactive\r\n' +
-                            'a=mid:' + transceiver.mid + '\r\n';
-                        return;
-                    }
-
-                    // FIXME: look at direction.
-                    if (transceiver.stream) {
-                        var localTrack;
-                        if (transceiver.kind === 'audio') {
-                            localTrack = transceiver.stream.getAudioTracks()[0];
-                        } else if (transceiver.kind === 'video') {
-                            localTrack = transceiver.stream.getVideoTracks()[0];
-                        }
-                        if (localTrack) {
-                            // add RTX
-                            if (edgeVersion >= 15019 && transceiver.kind === 'video' &&
-                                !transceiver.sendEncodingParameters[0].rtx) {
-                                transceiver.sendEncodingParameters[0].rtx = {
-                                    ssrc: transceiver.sendEncodingParameters[0].ssrc + 1
-                                };
-                            }
-                        }
-                    }
-
-                    // Calculate intersection of capabilities.
-                    var commonCapabilities = getCommonCapabilities(
-                        transceiver.localCapabilities,
-                        transceiver.remoteCapabilities);
-
-                    var hasRtx = commonCapabilities.codecs.filter(function(c) {
-                        return c.name.toLowerCase() === 'rtx';
-                    }).length;
-                    if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
-                        delete transceiver.sendEncodingParameters[0].rtx;
-                    }
-
-                    sdp += writeMediaSection(transceiver, commonCapabilities,
-                        'answer', transceiver.stream, pc._dtlsRole);
-                    if (transceiver.rtcpParameters &&
-                        transceiver.rtcpParameters.reducedSize) {
-                        sdp += 'a=rtcp-rsize\r\n';
-                    }
-                });
-
-                var desc = new window.RTCSessionDescription({
-                    type: 'answer',
-                    sdp: sdp
-                });
-                return Promise.resolve(desc);
-            };
-
-            RTCPeerConnection.prototype.addIceCandidate = function(candidate) {
-                var pc = this;
-                var sections;
-                if (candidate && !(candidate.sdpMLineIndex !== undefined ||
-                        candidate.sdpMid)) {
-                    return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));
-                }
-
-                // TODO: needs to go into ops queue.
-                return new Promise(function(resolve, reject) {
-                    if (!pc._remoteDescription) {
-                        return reject(makeError('InvalidStateError',
-                            'Can not add ICE candidate without a remote description'));
-                    } else if (!candidate || candidate.candidate === '') {
-                        for (var j = 0; j < pc.transceivers.length; j++) {
-                            if (pc.transceivers[j].rejected) {
-                                continue;
-                            }
-                            pc.transceivers[j].iceTransport.addRemoteCandidate({});
-                            sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);
-                            sections[j] += 'a=end-of-candidates\r\n';
-                            pc._remoteDescription.sdp =
-                                SDPUtils.getDescription(pc._remoteDescription.sdp) +
-                                sections.join('');
-                            if (pc.usingBundle) {
-                                break;
-                            }
-                        }
-                    } else {
-                        var sdpMLineIndex = candidate.sdpMLineIndex;
-                        if (candidate.sdpMid) {
-                            for (var i = 0; i < pc.transceivers.length; i++) {
-                                if (pc.transceivers[i].mid === candidate.sdpMid) {
-                                    sdpMLineIndex = i;
-                                    break;
-                                }
-                            }
-                        }
-                        var transceiver = pc.transceivers[sdpMLineIndex];
-                        if (transceiver) {
-                            if (transceiver.rejected) {
-                                return resolve();
-                            }
-                            var cand = Object.keys(candidate.candidate).length > 0 ?
-                                SDPUtils.parseCandidate(candidate.candidate) : {};
-                            // Ignore Chrome's invalid candidates since Edge does not like them.
-                            if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {
-                                return resolve();
-                            }
-                            // Ignore RTCP candidates, we assume RTCP-MUX.
-                            if (cand.component && cand.component !== 1) {
-                                return resolve();
-                            }
-                            // when using bundle, avoid adding candidates to the wrong
-                            // ice transport. And avoid adding candidates added in the SDP.
-                            if (sdpMLineIndex === 0 || (sdpMLineIndex > 0 &&
-                                    transceiver.iceTransport !== pc.transceivers[0].iceTransport)) {
-                                if (!maybeAddCandidate(transceiver.iceTransport, cand)) {
-                                    return reject(makeError('OperationError',
-                                        'Can not add ICE candidate'));
-                                }
-                            }
-
-                            // update the remoteDescription.
-                            var candidateString = candidate.candidate.trim();
-                            if (candidateString.indexOf('a=') === 0) {
-                                candidateString = candidateString.substr(2);
-                            }
-                            sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);
-                            sections[sdpMLineIndex] += 'a=' +
-                                (cand.type ? candidateString : 'end-of-candidates')
-                                + '\r\n';
-                            pc._remoteDescription.sdp =
-                                SDPUtils.getDescription(pc._remoteDescription.sdp) +
-                                sections.join('');
-                        } else {
-                            return reject(makeError('OperationError',
-                                'Can not add ICE candidate'));
-                        }
-                    }
-                    resolve();
-                });
-            };
-
-            RTCPeerConnection.prototype.getStats = function(selector) {
-                if (selector && selector instanceof window.MediaStreamTrack) {
-                    var senderOrReceiver = null;
-                    this.transceivers.forEach(function(transceiver) {
-                        if (transceiver.rtpSender &&
-                            transceiver.rtpSender.track === selector) {
-                            senderOrReceiver = transceiver.rtpSender;
-                        } else if (transceiver.rtpReceiver &&
-                            transceiver.rtpReceiver.track === selector) {
-                            senderOrReceiver = transceiver.rtpReceiver;
-                        }
-                    });
-                    if (!senderOrReceiver) {
-                        throw makeError('InvalidAccessError', 'Invalid selector.');
-                    }
-                    return senderOrReceiver.getStats();
-                }
-
-                var promises = [];
-                this.transceivers.forEach(function(transceiver) {
-                    ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',
-                        'dtlsTransport'].forEach(function(method) {
-                        if (transceiver[method]) {
-                            promises.push(transceiver[method].getStats());
-                        }
-                    });
-                });
-                return Promise.all(promises).then(function(allStats) {
-                    var results = new Map();
-                    allStats.forEach(function(stats) {
-                        stats.forEach(function(stat) {
-                            results.set(stat.id, stat);
-                        });
-                    });
-                    return results;
-                });
-            };
-
-            // fix low-level stat names and return Map instead of object.
-            var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer',
-                'RTCIceTransport', 'RTCDtlsTransport'];
-            ortcObjects.forEach(function(ortcObjectName) {
-                var obj = window[ortcObjectName];
-                if (obj && obj.prototype && obj.prototype.getStats) {
-                    var nativeGetstats = obj.prototype.getStats;
-                    obj.prototype.getStats = function() {
-                        return nativeGetstats.apply(this)
-                            .then(function(nativeStats) {
-                                var mapStats = new Map();
-                                Object.keys(nativeStats).forEach(function(id) {
-                                    nativeStats[id].type = fixStatsType(nativeStats[id]);
-                                    mapStats.set(id, nativeStats[id]);
-                                });
-                                return mapStats;
-                            });
-                    };
-                }
-            });
-
-            // legacy callback shims. Should be moved to adapter.js some days.
-            var methods = ['createOffer', 'createAnswer'];
-            methods.forEach(function(method) {
-                var nativeMethod = RTCPeerConnection.prototype[method];
-                RTCPeerConnection.prototype[method] = function() {
-                    var args = arguments;
-                    if (typeof args[0] === 'function' ||
-                        typeof args[1] === 'function') { // legacy
-                        return nativeMethod.apply(this, [arguments[2]])
-                            .then(function(description) {
-                                if (typeof args[0] === 'function') {
-                                    args[0].apply(null, [description]);
-                                }
-                            }, function(error) {
-                                if (typeof args[1] === 'function') {
-                                    args[1].apply(null, [error]);
-                                }
-                            });
-                    }
-                    return nativeMethod.apply(this, arguments);
-                };
-            });
-
-            methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];
-            methods.forEach(function(method) {
-                var nativeMethod = RTCPeerConnection.prototype[method];
-                RTCPeerConnection.prototype[method] = function() {
-                    var args = arguments;
-                    if (typeof args[1] === 'function' ||
-                        typeof args[2] === 'function') { // legacy
-                        return nativeMethod.apply(this, arguments)
-                            .then(function() {
-                                if (typeof args[1] === 'function') {
-                                    args[1].apply(null);
-                                }
-                            }, function(error) {
-                                if (typeof args[2] === 'function') {
-                                    args[2].apply(null, [error]);
-                                }
-                            });
-                    }
-                    return nativeMethod.apply(this, arguments);
-                };
-            });
-
-            // getStats is special. It doesn't have a spec legacy method yet we support
-            // getStats(something, cb) without error callbacks.
-            ['getStats'].forEach(function(method) {
-                var nativeMethod = RTCPeerConnection.prototype[method];
-                RTCPeerConnection.prototype[method] = function() {
-                    var args = arguments;
-                    if (typeof args[1] === 'function') {
-                        return nativeMethod.apply(this, arguments)
-                            .then(function() {
-                                if (typeof args[1] === 'function') {
-                                    args[1].apply(null);
-                                }
-                            });
-                    }
-                    return nativeMethod.apply(this, arguments);
-                };
-            });
-
-            return RTCPeerConnection;
-        };
-
-    },{"sdp":2}],2:[function(require,module,exports){
-        /* eslint-env node */
-        'use strict';
-
-        // SDP helpers.
-        var SDPUtils = {};
-
-        // Generate an alphanumeric identifier for cname or mids.
-        // TODO: use UUIDs instead? https://gist.github.com/jed/982883
-        SDPUtils.generateIdentifier = function() {
-            return Math.random().toString(36).substr(2, 10);
-        };
-
-        // The RTCP CNAME used by all peerconnections from the same JS.
-        SDPUtils.localCName = SDPUtils.generateIdentifier();
-
-        // Splits SDP into lines, dealing with both CRLF and LF.
-        SDPUtils.splitLines = function(blob) {
-            return blob.trim().split('\n').map(function(line) {
-                return line.trim();
-            });
-        };
-        // Splits SDP into sessionpart and mediasections. Ensures CRLF.
-        SDPUtils.splitSections = function(blob) {
-            var parts = blob.split('\nm=');
-            return parts.map(function(part, index) {
-                return (index > 0 ? 'm=' + part : part).trim() + '\r\n';
-            });
-        };
-
-        // returns the session description.
-        SDPUtils.getDescription = function(blob) {
-            var sections = SDPUtils.splitSections(blob);
-            return sections && sections[0];
-        };
-
-        // returns the individual media sections.
-        SDPUtils.getMediaSections = function(blob) {
-            var sections = SDPUtils.splitSections(blob);
-            sections.shift();
-            return sections;
-        };
-
-        // Returns lines that start with a certain prefix.
-        SDPUtils.matchPrefix = function(blob, prefix) {
-            return SDPUtils.splitLines(blob).filter(function(line) {
-                return line.indexOf(prefix) === 0;
-            });
-        };
-
-        // Parses an ICE candidate line. Sample input:
-        // candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8
-        // rport 55996"
-        SDPUtils.parseCandidate = function(line) {
-            var parts;
-            // Parse both variants.
-            if (line.indexOf('a=candidate:') === 0) {
-                parts = line.substring(12).split(' ');
-            } else {
-                parts = line.substring(10).split(' ');
-            }
-
-            var candidate = {
-                foundation: parts[0],
-                component: parseInt(parts[1], 10),
-                protocol: parts[2].toLowerCase(),
-                priority: parseInt(parts[3], 10),
-                ip: parts[4],
-                address: parts[4], // address is an alias for ip.
-                port: parseInt(parts[5], 10),
-                // skip parts[6] == 'typ'
-                type: parts[7]
-            };
-
-            for (var i = 8; i < parts.length; i += 2) {
-                switch (parts[i]) {
-                    case 'raddr':
-                        candidate.relatedAddress = parts[i + 1];
-                        break;
-                    case 'rport':
-                        candidate.relatedPort = parseInt(parts[i + 1], 10);
-                        break;
-                    case 'tcptype':
-                        candidate.tcpType = parts[i + 1];
-                        break;
-                    case 'ufrag':
-                        candidate.ufrag = parts[i + 1]; // for backward compability.
-                        candidate.usernameFragment = parts[i + 1];
-                        break;
-                    default: // extension handling, in particular ufrag
-                        candidate[parts[i]] = parts[i + 1];
-                        break;
-                }
-            }
-            return candidate;
-        };
-
-        // Translates a candidate object into SDP candidate attribute.
-        SDPUtils.writeCandidate = function(candidate) {
-            var sdp = [];
-            sdp.push(candidate.foundation);
-            sdp.push(candidate.component);
-            sdp.push(candidate.protocol.toUpperCase());
-            sdp.push(candidate.priority);
-            sdp.push(candidate.address || candidate.ip);
-            sdp.push(candidate.port);
-
-            var type = candidate.type;
-            sdp.push('typ');
-            sdp.push(type);
-            if (type !== 'host' && candidate.relatedAddress &&
-                candidate.relatedPort) {
-                sdp.push('raddr');
-                sdp.push(candidate.relatedAddress);
-                sdp.push('rport');
-                sdp.push(candidate.relatedPort);
-            }
-            if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {
-                sdp.push('tcptype');
-                sdp.push(candidate.tcpType);
-            }
-            if (candidate.usernameFragment || candidate.ufrag) {
-                sdp.push('ufrag');
-                sdp.push(candidate.usernameFragment || candidate.ufrag);
-            }
-            return 'candidate:' + sdp.join(' ');
-        };
-
-        // Parses an ice-options line, returns an array of option tags.
-        // a=ice-options:foo bar
-        SDPUtils.parseIceOptions = function(line) {
-            return line.substr(14).split(' ');
-        };
-
-        // Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:
-        // a=rtpmap:111 opus/48000/2
-        SDPUtils.parseRtpMap = function(line) {
-            var parts = line.substr(9).split(' ');
-            var parsed = {
-                payloadType: parseInt(parts.shift(), 10) // was: id
-            };
-
-            parts = parts[0].split('/');
-
-            parsed.name = parts[0];
-            parsed.clockRate = parseInt(parts[1], 10); // was: clockrate
-            parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;
-            // legacy alias, got renamed back to channels in ORTC.
-            parsed.numChannels = parsed.channels;
-            return parsed;
-        };
-
-        // Generate an a=rtpmap line from RTCRtpCodecCapability or
-        // RTCRtpCodecParameters.
-        SDPUtils.writeRtpMap = function(codec) {
-            var pt = codec.payloadType;
-            if (codec.preferredPayloadType !== undefined) {
-                pt = codec.preferredPayloadType;
-            }
-            var channels = codec.channels || codec.numChannels || 1;
-            return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +
-                (channels !== 1 ? '/' + channels : '') + '\r\n';
-        };
-
-        // Parses an a=extmap line (headerextension from RFC 5285). Sample input:
-        // a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
-        // a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset
-        SDPUtils.parseExtmap = function(line) {
-            var parts = line.substr(9).split(' ');
-            return {
-                id: parseInt(parts[0], 10),
-                direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',
-                uri: parts[1]
-            };
-        };
-
-        // Generates a=extmap line from RTCRtpHeaderExtensionParameters or
-        // RTCRtpHeaderExtension.
-        SDPUtils.writeExtmap = function(headerExtension) {
-            return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +
-                (headerExtension.direction && headerExtension.direction !== 'sendrecv'
-                    ? '/' + headerExtension.direction
-                    : '') +
-                ' ' + headerExtension.uri + '\r\n';
-        };
-
-        // Parses an ftmp line, returns dictionary. Sample input:
-        // a=fmtp:96 vbr=on;cng=on
-        // Also deals with vbr=on; cng=on
-        SDPUtils.parseFmtp = function(line) {
-            var parsed = {};
-            var kv;
-            var parts = line.substr(line.indexOf(' ') + 1).split(';');
-            for (var j = 0; j < parts.length; j++) {
-                kv = parts[j].trim().split('=');
-                parsed[kv[0].trim()] = kv[1];
-            }
-            return parsed;
-        };
-
-        // Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.
-        SDPUtils.writeFmtp = function(codec) {
-            var line = '';
-            var pt = codec.payloadType;
-            if (codec.preferredPayloadType !== undefined) {
-                pt = codec.preferredPayloadType;
-            }
-            if (codec.parameters && Object.keys(codec.parameters).length) {
-                var params = [];
-                Object.keys(codec.parameters).forEach(function(param) {
-                    if (codec.parameters[param]) {
-                        params.push(param + '=' + codec.parameters[param]);
-                    } else {
-                        params.push(param);
-                    }
-                });
-                line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\r\n';
-            }
-            return line;
-        };
-
-        // Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:
-        // a=rtcp-fb:98 nack rpsi
-        SDPUtils.parseRtcpFb = function(line) {
-            var parts = line.substr(line.indexOf(' ') + 1).split(' ');
-            return {
-                type: parts.shift(),
-                parameter: parts.join(' ')
-            };
-        };
-        // Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.
-        SDPUtils.writeRtcpFb = function(codec) {
-            var lines = '';
-            var pt = codec.payloadType;
-            if (codec.preferredPayloadType !== undefined) {
-                pt = codec.preferredPayloadType;
-            }
-            if (codec.rtcpFeedback && codec.rtcpFeedback.length) {
-                // FIXME: special handling for trr-int?
-                codec.rtcpFeedback.forEach(function(fb) {
-                    lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +
-                        (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +
-                        '\r\n';
-                });
-            }
-            return lines;
-        };
-
-        // Parses an RFC 5576 ssrc media attribute. Sample input:
-        // a=ssrc:3735928559 cname:something
-        SDPUtils.parseSsrcMedia = function(line) {
-            var sp = line.indexOf(' ');
-            var parts = {
-                ssrc: parseInt(line.substr(7, sp - 7), 10)
-            };
-            var colon = line.indexOf(':', sp);
-            if (colon > -1) {
-                parts.attribute = line.substr(sp + 1, colon - sp - 1);
-                parts.value = line.substr(colon + 1);
-            } else {
-                parts.attribute = line.substr(sp + 1);
-            }
-            return parts;
-        };
-
-        SDPUtils.parseSsrcGroup = function(line) {
-            var parts = line.substr(13).split(' ');
-            return {
-                semantics: parts.shift(),
-                ssrcs: parts.map(function(ssrc) {
-                    return parseInt(ssrc, 10);
-                })
-            };
-        };
-
-        // Extracts the MID (RFC 5888) from a media section.
-        // returns the MID or undefined if no mid line was found.
-        SDPUtils.getMid = function(mediaSection) {
-            var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];
-            if (mid) {
-                return mid.substr(6);
-            }
-        };
-
-        SDPUtils.parseFingerprint = function(line) {
-            var parts = line.substr(14).split(' ');
-            return {
-                algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.
-                value: parts[1]
-            };
-        };
-
-        // Extracts DTLS parameters from SDP media section or sessionpart.
-        // FIXME: for consistency with other functions this should only
-        //   get the fingerprint line as input. See also getIceParameters.
-        SDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {
-            var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,
-                'a=fingerprint:');
-            // Note: a=setup line is ignored since we use the 'auto' role.
-            // Note2: 'algorithm' is not case sensitive except in Edge.
-            return {
-                role: 'auto',
-                fingerprints: lines.map(SDPUtils.parseFingerprint)
-            };
-        };
-
-        // Serializes DTLS parameters to SDP.
-        SDPUtils.writeDtlsParameters = function(params, setupType) {
-            var sdp = 'a=setup:' + setupType + '\r\n';
-            params.fingerprints.forEach(function(fp) {
-                sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\r\n';
-            });
-            return sdp;
-        };
-        // Parses ICE information from SDP media section or sessionpart.
-        // FIXME: for consistency with other functions this should only
-        //   get the ice-ufrag and ice-pwd lines as input.
-        SDPUtils.getIceParameters = function(mediaSection, sessionpart) {
-            var lines = SDPUtils.splitLines(mediaSection);
-            // Search in session part, too.
-            lines = lines.concat(SDPUtils.splitLines(sessionpart));
-            var iceParameters = {
-                usernameFragment: lines.filter(function(line) {
-                    return line.indexOf('a=ice-ufrag:') === 0;
-                })[0].substr(12),
-                password: lines.filter(function(line) {
-                    return line.indexOf('a=ice-pwd:') === 0;
-                })[0].substr(10)
-            };
-            return iceParameters;
-        };
-
-        // Serializes ICE parameters to SDP.
-        SDPUtils.writeIceParameters = function(params) {
-            return 'a=ice-ufrag:' + params.usernameFragment + '\r\n' +
-                'a=ice-pwd:' + params.password + '\r\n';
-        };
-
-        // Parses the SDP media section and returns RTCRtpParameters.
-        SDPUtils.parseRtpParameters = function(mediaSection) {
-            var description = {
-                codecs: [],
-                headerExtensions: [],
-                fecMechanisms: [],
-                rtcp: []
-            };
-            var lines = SDPUtils.splitLines(mediaSection);
-            var mline = lines[0].split(' ');
-            for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]
-                var pt = mline[i];
-                var rtpmapline = SDPUtils.matchPrefix(
-                    mediaSection, 'a=rtpmap:' + pt + ' ')[0];
-                if (rtpmapline) {
-                    var codec = SDPUtils.parseRtpMap(rtpmapline);
-                    var fmtps = SDPUtils.matchPrefix(
-                        mediaSection, 'a=fmtp:' + pt + ' ');
-                    // Only the first a=fmtp:<pt> is considered.
-                    codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};
-                    codec.rtcpFeedback = SDPUtils.matchPrefix(
-                        mediaSection, 'a=rtcp-fb:' + pt + ' ')
-                        .map(SDPUtils.parseRtcpFb);
-                    description.codecs.push(codec);
-                    // parse FEC mechanisms from rtpmap lines.
-                    switch (codec.name.toUpperCase()) {
-                        case 'RED':
-                        case 'ULPFEC':
-                            description.fecMechanisms.push(codec.name.toUpperCase());
-                            break;
-                        default: // only RED and ULPFEC are recognized as FEC mechanisms.
-                            break;
-                    }
-                }
-            }
-            SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {
-                description.headerExtensions.push(SDPUtils.parseExtmap(line));
-            });
-            // FIXME: parse rtcp.
-            return description;
-        };
-
-        // Generates parts of the SDP media section describing the capabilities /
-        // parameters.
-        SDPUtils.writeRtpDescription = function(kind, caps) {
-            var sdp = '';
-
-            // Build the mline.
-            sdp += 'm=' + kind + ' ';
-            sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.
-            sdp += ' UDP/TLS/RTP/SAVPF ';
-            sdp += caps.codecs.map(function(codec) {
-                if (codec.preferredPayloadType !== undefined) {
-                    return codec.preferredPayloadType;
-                }
-                return codec.payloadType;
-            }).join(' ') + '\r\n';
-
-            sdp += 'c=IN IP4 0.0.0.0\r\n';
-            sdp += 'a=rtcp:9 IN IP4 0.0.0.0\r\n';
-
-            // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.
-            caps.codecs.forEach(function(codec) {
-                sdp += SDPUtils.writeRtpMap(codec);
-                sdp += SDPUtils.writeFmtp(codec);
-                sdp += SDPUtils.writeRtcpFb(codec);
-            });
-            var maxptime = 0;
-            caps.codecs.forEach(function(codec) {
-                if (codec.maxptime > maxptime) {
-                    maxptime = codec.maxptime;
-                }
-            });
-            if (maxptime > 0) {
-                sdp += 'a=maxptime:' + maxptime + '\r\n';
-            }
-            sdp += 'a=rtcp-mux\r\n';
-
-            if (caps.headerExtensions) {
-                caps.headerExtensions.forEach(function(extension) {
-                    sdp += SDPUtils.writeExtmap(extension);
-                });
-            }
-            // FIXME: write fecMechanisms.
-            return sdp;
-        };
-
-        // Parses the SDP media section and returns an array of
-        // RTCRtpEncodingParameters.
-        SDPUtils.parseRtpEncodingParameters = function(mediaSection) {
-            var encodingParameters = [];
-            var description = SDPUtils.parseRtpParameters(mediaSection);
-            var hasRed = description.fecMechanisms.indexOf('RED') !== -1;
-            var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;
-
-            // filter a=ssrc:... cname:, ignore PlanB-msid
-            var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
-                .map(function(line) {
-                    return SDPUtils.parseSsrcMedia(line);
-                })
-                .filter(function(parts) {
-                    return parts.attribute === 'cname';
-                });
-            var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;
-            var secondarySsrc;
-
-            var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')
-                .map(function(line) {
-                    var parts = line.substr(17).split(' ');
-                    return parts.map(function(part) {
-                        return parseInt(part, 10);
-                    });
-                });
-            if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {
-                secondarySsrc = flows[0][1];
-            }
-
-            description.codecs.forEach(function(codec) {
-                if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {
-                    var encParam = {
-                        ssrc: primarySsrc,
-                        codecPayloadType: parseInt(codec.parameters.apt, 10)
-                    };
-                    if (primarySsrc && secondarySsrc) {
-                        encParam.rtx = {ssrc: secondarySsrc};
-                    }
-                    encodingParameters.push(encParam);
-                    if (hasRed) {
-                        encParam = JSON.parse(JSON.stringify(encParam));
-                        encParam.fec = {
-                            ssrc: primarySsrc,
-                            mechanism: hasUlpfec ? 'red+ulpfec' : 'red'
-                        };
-                        encodingParameters.push(encParam);
-                    }
-                }
-            });
-            if (encodingParameters.length === 0 && primarySsrc) {
-                encodingParameters.push({
-                    ssrc: primarySsrc
-                });
-            }
-
-            // we support both b=AS and b=TIAS but interpret AS as TIAS.
-            var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');
-            if (bandwidth.length) {
-                if (bandwidth[0].indexOf('b=TIAS:') === 0) {
-                    bandwidth = parseInt(bandwidth[0].substr(7), 10);
-                } else if (bandwidth[0].indexOf('b=AS:') === 0) {
-                    // use formula from JSEP to convert b=AS to TIAS value.
-                    bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95
-                        - (50 * 40 * 8);
-                } else {
-                    bandwidth = undefined;
-                }
-                encodingParameters.forEach(function(params) {
-                    params.maxBitrate = bandwidth;
-                });
-            }
-            return encodingParameters;
-        };
-
-        // parses http://draft.ortc.org/#rtcrtcpparameters*
-        SDPUtils.parseRtcpParameters = function(mediaSection) {
-            var rtcpParameters = {};
-
-            // Gets the first SSRC. Note tha with RTX there might be multiple
-            // SSRCs.
-            var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
-                .map(function(line) {
-                    return SDPUtils.parseSsrcMedia(line);
-                })
-                .filter(function(obj) {
-                    return obj.attribute === 'cname';
-                })[0];
-            if (remoteSsrc) {
-                rtcpParameters.cname = remoteSsrc.value;
-                rtcpParameters.ssrc = remoteSsrc.ssrc;
-            }
-
-            // Edge uses the compound attribute instead of reducedSize
-            // compound is !reducedSize
-            var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');
-            rtcpParameters.reducedSize = rsize.length > 0;
-            rtcpParameters.compound = rsize.length === 0;
-
-            // parses the rtcp-mux attrіbute.
-            // Note that Edge does not support unmuxed RTCP.
-            var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');
-            rtcpParameters.mux = mux.length > 0;
-
-            return rtcpParameters;
-        };
-
-        // parses either a=msid: or a=ssrc:... msid lines and returns
-        // the id of the MediaStream and MediaStreamTrack.
-        SDPUtils.parseMsid = function(mediaSection) {
-            var parts;
-            var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');
-            if (spec.length === 1) {
-                parts = spec[0].substr(7).split(' ');
-                return {stream: parts[0], track: parts[1]};
-            }
-            var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
-                .map(function(line) {
-                    return SDPUtils.parseSsrcMedia(line);
-                })
-                .filter(function(msidParts) {
-                    return msidParts.attribute === 'msid';
-                });
-            if (planB.length > 0) {
-                parts = planB[0].value.split(' ');
-                return {stream: parts[0], track: parts[1]};
-            }
-        };
-
-        // Generate a session ID for SDP.
-        // https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1
-        // recommends using a cryptographically random +ve 64-bit value
-        // but right now this should be acceptable and within the right range
-        SDPUtils.generateSessionId = function() {
-            return Math.random().toString().substr(2, 21);
-        };
-
-        // Write boilder plate for start of SDP
-        // sessId argument is optional - if not supplied it will
-        // be generated randomly
-        // sessVersion is optional and defaults to 2
-        // sessUser is optional and defaults to 'thisisadapterortc'
-        SDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {
-            var sessionId;
-            var version = sessVer !== undefined ? sessVer : 2;
-            if (sessId) {
-                sessionId = sessId;
-            } else {
-                sessionId = SDPUtils.generateSessionId();
-            }
-            var user = sessUser || 'thisisadapterortc';
-            // FIXME: sess-id should be an NTP timestamp.
-            return 'v=0\r\n' +
-                'o=' + user + ' ' + sessionId + ' ' + version +
-                ' IN IP4 127.0.0.1\r\n' +
-                's=-\r\n' +
-                't=0 0\r\n';
-        };
-
-        SDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {
-            var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);
-
-            // Map ICE parameters (ufrag, pwd) to SDP.
-            sdp += SDPUtils.writeIceParameters(
-                transceiver.iceGatherer.getLocalParameters());
-
-            // Map DTLS parameters to SDP.
-            sdp += SDPUtils.writeDtlsParameters(
-                transceiver.dtlsTransport.getLocalParameters(),
-                type === 'offer' ? 'actpass' : 'active');
-
-            sdp += 'a=mid:' + transceiver.mid + '\r\n';
-
-            if (transceiver.direction) {
-                sdp += 'a=' + transceiver.direction + '\r\n';
-            } else if (transceiver.rtpSender && transceiver.rtpReceiver) {
-                sdp += 'a=sendrecv\r\n';
-            } else if (transceiver.rtpSender) {
-                sdp += 'a=sendonly\r\n';
-            } else if (transceiver.rtpReceiver) {
-                sdp += 'a=recvonly\r\n';
-            } else {
-                sdp += 'a=inactive\r\n';
-            }
-
-            if (transceiver.rtpSender) {
-                // spec.
-                var msid = 'msid:' + stream.id + ' ' +
-                    transceiver.rtpSender.track.id + '\r\n';
-                sdp += 'a=' + msid;
-
-                // for Chrome.
-                sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
-                    ' ' + msid;
-                if (transceiver.sendEncodingParameters[0].rtx) {
-                    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
-                        ' ' + msid;
-                    sdp += 'a=ssrc-group:FID ' +
-                        transceiver.sendEncodingParameters[0].ssrc + ' ' +
-                        transceiver.sendEncodingParameters[0].rtx.ssrc +
-                        '\r\n';
-                }
-            }
-            // FIXME: this should be written by writeRtpDescription.
-            sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
-                ' cname:' + SDPUtils.localCName + '\r\n';
-            if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
-                sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
-                    ' cname:' + SDPUtils.localCName + '\r\n';
-            }
-            return sdp;
-        };
-
-        // Gets the direction from the mediaSection or the sessionpart.
-        SDPUtils.getDirection = function(mediaSection, sessionpart) {
-            // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.
-            var lines = SDPUtils.splitLines(mediaSection);
-            for (var i = 0; i < lines.length; i++) {
-                switch (lines[i]) {
-                    case 'a=sendrecv':
-                    case 'a=sendonly':
-                    case 'a=recvonly':
-                    case 'a=inactive':
-                        return lines[i].substr(2);
-                    default:
-                    // FIXME: What should happen here?
-                }
-            }
-            if (sessionpart) {
-                return SDPUtils.getDirection(sessionpart);
-            }
-            return 'sendrecv';
-        };
-
-        SDPUtils.getKind = function(mediaSection) {
-            var lines = SDPUtils.splitLines(mediaSection);
-            var mline = lines[0].split(' ');
-            return mline[0].substr(2);
-        };
-
-        SDPUtils.isRejected = function(mediaSection) {
-            return mediaSection.split(' ', 2)[1] === '0';
-        };
-
-        SDPUtils.parseMLine = function(mediaSection) {
-            var lines = SDPUtils.splitLines(mediaSection);
-            var parts = lines[0].substr(2).split(' ');
-            return {
-                kind: parts[0],
-                port: parseInt(parts[1], 10),
-                protocol: parts[2],
-                fmt: parts.slice(3).join(' ')
-            };
-        };
-
-        SDPUtils.parseOLine = function(mediaSection) {
-            var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];
-            var parts = line.substr(2).split(' ');
-            return {
-                username: parts[0],
-                sessionId: parts[1],
-                sessionVersion: parseInt(parts[2], 10),
-                netType: parts[3],
-                addressType: parts[4],
-                address: parts[5]
-            };
-        };
-
-        // a very naive interpretation of a valid SDP.
-        SDPUtils.isValidSDP = function(blob) {
-            if (typeof blob !== 'string' || blob.length === 0) {
-                return false;
-            }
-            var lines = SDPUtils.splitLines(blob);
-            for (var i = 0; i < lines.length; i++) {
-                if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {
-                    return false;
-                }
-                // TODO: check the modifier a bit more.
-            }
-            return true;
-        };
-
-        // Expose public methods.
-        if (typeof module === 'object') {
-            module.exports = SDPUtils;
-        }
-
-    },{}],3:[function(require,module,exports){
-        (function (global){
-            /*
-             *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-             *
-             *  Use of this source code is governed by a BSD-style license
-             *  that can be found in the LICENSE file in the root of the source
-             *  tree.
-             */
-            /* eslint-env node */
-
-            'use strict';
-
-            var adapterFactory = require('./adapter_factory.js');
-            module.exports = adapterFactory({window: global.window});
-
-        }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-    },{"./adapter_factory.js":4}],4:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-
-        'use strict';
-
-        var utils = require('./utils');
-        // Shimming starts here.
-        module.exports = function(dependencies, opts) {
-            var window = dependencies && dependencies.window;
-
-            var options = {
-                shimChrome: true,
-                shimFirefox: true,
-                shimEdge: true,
-                shimSafari: true,
-            };
-
-            for (var key in opts) {
-                if (hasOwnProperty.call(opts, key)) {
-                    options[key] = opts[key];
-                }
-            }
-
-            // Utils.
-            var logging = utils.log;
-            var browserDetails = utils.detectBrowser(window);
-
-            // Uncomment the line below if you want logging to occur, including logging
-            // for the switch statement below. Can also be turned on in the browser via
-            // adapter.disableLog(false), but then logging from the switch statement below
-            // will not appear.
-            // require('./utils').disableLog(false);
-
-            // Browser shims.
-            var chromeShim = require('./chrome/chrome_shim') || null;
-            var edgeShim = require('./edge/edge_shim') || null;
-            var firefoxShim = require('./firefox/firefox_shim') || null;
-            var safariShim = require('./safari/safari_shim') || null;
-            var commonShim = require('./common_shim') || null;
-
-            // Export to the adapter global object visible in the browser.
-            var adapter = {
-                browserDetails: browserDetails,
-                commonShim: commonShim,
-                extractVersion: utils.extractVersion,
-                disableLog: utils.disableLog,
-                disableWarnings: utils.disableWarnings
-            };
-
-            // Shim browser if found.
-            switch (browserDetails.browser) {
-                case 'chrome':
-                    if (!chromeShim || !chromeShim.shimPeerConnection ||
-                        !options.shimChrome) {
-                        logging('Chrome shim is not included in this adapter release.');
-                        return adapter;
-                    }
-                    logging('adapter.js shimming chrome.');
-                    // Export to the adapter global object visible in the browser.
-                    adapter.browserShim = chromeShim;
-                    commonShim.shimCreateObjectURL(window);
-
-                    chromeShim.shimGetUserMedia(window);
-                    chromeShim.shimMediaStream(window);
-                    chromeShim.shimSourceObject(window);
-                    chromeShim.shimPeerConnection(window);
-                    chromeShim.shimOnTrack(window);
-                    chromeShim.shimAddTrackRemoveTrack(window);
-                    chromeShim.shimGetSendersWithDtmf(window);
-                    chromeShim.shimSenderReceiverGetStats(window);
-                    chromeShim.fixNegotiationNeeded(window);
-
-                    commonShim.shimRTCIceCandidate(window);
-                    commonShim.shimMaxMessageSize(window);
-                    commonShim.shimSendThrowTypeError(window);
-                    break;
-                case 'firefox':
-                    if (!firefoxShim || !firefoxShim.shimPeerConnection ||
-                        !options.shimFirefox) {
-                        logging('Firefox shim is not included in this adapter release.');
-                        return adapter;
-                    }
-                    logging('adapter.js shimming firefox.');
-                    // Export to the adapter global object visible in the browser.
-                    adapter.browserShim = firefoxShim;
-                    commonShim.shimCreateObjectURL(window);
-
-                    firefoxShim.shimGetUserMedia(window);
-                    firefoxShim.shimSourceObject(window);
-                    firefoxShim.shimPeerConnection(window);
-                    firefoxShim.shimOnTrack(window);
-                    firefoxShim.shimRemoveStream(window);
-                    firefoxShim.shimSenderGetStats(window);
-                    firefoxShim.shimReceiverGetStats(window);
-                    firefoxShim.shimRTCDataChannel(window);
-
-                    commonShim.shimRTCIceCandidate(window);
-                    commonShim.shimMaxMessageSize(window);
-                    commonShim.shimSendThrowTypeError(window);
-                    break;
-                case 'edge':
-                    if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {
-                        logging('MS edge shim is not included in this adapter release.');
-                        return adapter;
-                    }
-                    logging('adapter.js shimming edge.');
-                    // Export to the adapter global object visible in the browser.
-                    adapter.browserShim = edgeShim;
-                    commonShim.shimCreateObjectURL(window);
-
-                    edgeShim.shimGetUserMedia(window);
-                    edgeShim.shimPeerConnection(window);
-                    edgeShim.shimReplaceTrack(window);
-
-                    // the edge shim implements the full RTCIceCandidate object.
-
-                    commonShim.shimMaxMessageSize(window);
-                    commonShim.shimSendThrowTypeError(window);
-                    break;
-                case 'safari':
-                    if (!safariShim || !options.shimSafari) {
-                        logging('Safari shim is not included in this adapter release.');
-                        return adapter;
-                    }
-                    logging('adapter.js shimming safari.');
-                    // Export to the adapter global object visible in the browser.
-                    adapter.browserShim = safariShim;
-                    commonShim.shimCreateObjectURL(window);
-
-                    safariShim.shimRTCIceServerUrls(window);
-                    safariShim.shimCreateOfferLegacy(window);
-                    safariShim.shimCallbacksAPI(window);
-                    safariShim.shimLocalStreamsAPI(window);
-                    safariShim.shimRemoteStreamsAPI(window);
-                    safariShim.shimTrackEventTransceiver(window);
-                    safariShim.shimGetUserMedia(window);
-
-                    commonShim.shimRTCIceCandidate(window);
-                    commonShim.shimMaxMessageSize(window);
-                    commonShim.shimSendThrowTypeError(window);
-                    break;
-                default:
-                    logging('Unsupported browser!');
-                    break;
-            }
-
-            return adapter;
-        };
-
-    },{"./chrome/chrome_shim":5,"./common_shim":7,"./edge/edge_shim":8,"./firefox/firefox_shim":11,"./safari/safari_shim":13,"./utils":14}],5:[function(require,module,exports){
-
-        /*
-         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-        'use strict';
-        var utils = require('../utils.js');
-        var logging = utils.log;
-
-        /* iterates the stats graph recursively. */
-        function walkStats(stats, base, resultSet) {
-            if (!base || resultSet.has(base.id)) {
-                return;
-            }
-            resultSet.set(base.id, base);
-            Object.keys(base).forEach(function(name) {
-                if (name.endsWith('Id')) {
-                    walkStats(stats, stats.get(base[name]), resultSet);
-                } else if (name.endsWith('Ids')) {
-                    base[name].forEach(function(id) {
-                        walkStats(stats, stats.get(id), resultSet);
-                    });
-                }
-            });
-        }
-
-        /* filter getStats for a sender/receiver track. */
-        function filterStats(result, track, outbound) {
-            var streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';
-            var filteredResult = new Map();
-            if (track === null) {
-                return filteredResult;
-            }
-            var trackStats = [];
-            result.forEach(function(value) {
-                if (value.type === 'track' &&
-                    value.trackIdentifier === track.id) {
-                    trackStats.push(value);
-                }
-            });
-            trackStats.forEach(function(trackStat) {
-                result.forEach(function(stats) {
-                    if (stats.type === streamStatsType && stats.trackId === trackStat.id) {
-                        walkStats(result, stats, filteredResult);
-                    }
-                });
-            });
-            return filteredResult;
-        }
-
-        module.exports = {
-            shimGetUserMedia: require('./getusermedia'),
-            shimMediaStream: function(window) {
-                window.MediaStream = window.MediaStream || window.webkitMediaStream;
-            },
-
-            shimOnTrack: function(window) {
-                if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in
-                        window.RTCPeerConnection.prototype)) {
-                    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
-                        get: function() {
-                            return this._ontrack;
-                        },
-                        set: function(f) {
-                            if (this._ontrack) {
-                                this.removeEventListener('track', this._ontrack);
-                            }
-                            this.addEventListener('track', this._ontrack = f);
-                        },
-                        enumerable: true,
-                        configurable: true
-                    });
-                    var origSetRemoteDescription =
-                        window.RTCPeerConnection.prototype.setRemoteDescription;
-                    window.RTCPeerConnection.prototype.setRemoteDescription = function() {
-                        var pc = this;
-                        if (!pc._ontrackpoly) {
-                            pc._ontrackpoly = function(e) {
-                                // onaddstream does not fire when a track is added to an existing
-                                // stream. But stream.onaddtrack is implemented so we use that.
-                                e.stream.addEventListener('addtrack', function(te) {
-                                    var receiver;
-                                    if (window.RTCPeerConnection.prototype.getReceivers) {
-                                        receiver = pc.getReceivers().find(function(r) {
-                                            return r.track && r.track.id === te.track.id;
-                                        });
-                                    } else {
-                                        receiver = {track: te.track};
-                                    }
-
-                                    var event = new Event('track');
-                                    event.track = te.track;
-                                    event.receiver = receiver;
-                                    event.transceiver = {receiver: receiver};
-                                    event.streams = [e.stream];
-                                    pc.dispatchEvent(event);
-                                });
-                                e.stream.getTracks().forEach(function(track) {
-                                    var receiver;
-                                    if (window.RTCPeerConnection.prototype.getReceivers) {
-                                        receiver = pc.getReceivers().find(function(r) {
-                                            return r.track && r.track.id === track.id;
-                                        });
-                                    } else {
-                                        receiver = {track: track};
-                                    }
-                                    var event = new Event('track');
-                                    event.track = track;
-                                    event.receiver = receiver;
-                                    event.transceiver = {receiver: receiver};
-                                    event.streams = [e.stream];
-                                    pc.dispatchEvent(event);
-                                });
-                            };
-                            pc.addEventListener('addstream', pc._ontrackpoly);
-                        }
-                        return origSetRemoteDescription.apply(pc, arguments);
-                    };
-                } else {
-                    // even if RTCRtpTransceiver is in window, it is only used and
-                    // emitted in unified-plan. Unfortunately this means we need
-                    // to unconditionally wrap the event.
-                    utils.wrapPeerConnectionEvent(window, 'track', function(e) {
-                        if (!e.transceiver) {
-                            Object.defineProperty(e, 'transceiver',
-                                {value: {receiver: e.receiver}});
-                        }
-                        return e;
-                    });
-                }
-            },
-
-            shimGetSendersWithDtmf: function(window) {
-                // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.
-                if (typeof window === 'object' && window.RTCPeerConnection &&
-                    !('getSenders' in window.RTCPeerConnection.prototype) &&
-                    'createDTMFSender' in window.RTCPeerConnection.prototype) {
-                    var shimSenderWithDtmf = function(pc, track) {
-                        return {
-                            track: track,
-                            get dtmf() {
-                                if (this._dtmf === undefined) {
-                                    if (track.kind === 'audio') {
-                                        this._dtmf = pc.createDTMFSender(track);
-                                    } else {
-                                        this._dtmf = null;
-                                    }
-                                }
-                                return this._dtmf;
-                            },
-                            _pc: pc
-                        };
-                    };
-
-                    // augment addTrack when getSenders is not available.
-                    if (!window.RTCPeerConnection.prototype.getSenders) {
-                        window.RTCPeerConnection.prototype.getSenders = function() {
-                            this._senders = this._senders || [];
-                            return this._senders.slice(); // return a copy of the internal state.
-                        };
-                        var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
-                        window.RTCPeerConnection.prototype.addTrack = function(track, stream) {
-                            var pc = this;
-                            var sender = origAddTrack.apply(pc, arguments);
-                            if (!sender) {
-                                sender = shimSenderWithDtmf(pc, track);
-                                pc._senders.push(sender);
-                            }
-                            return sender;
-                        };
-
-                        var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;
-                        window.RTCPeerConnection.prototype.removeTrack = function(sender) {
-                            var pc = this;
-                            origRemoveTrack.apply(pc, arguments);
-                            var idx = pc._senders.indexOf(sender);
-                            if (idx !== -1) {
-                                pc._senders.splice(idx, 1);
-                            }
-                        };
-                    }
-                    var origAddStream = window.RTCPeerConnection.prototype.addStream;
-                    window.RTCPeerConnection.prototype.addStream = function(stream) {
-                        var pc = this;
-                        pc._senders = pc._senders || [];
-                        origAddStream.apply(pc, [stream]);
-                        stream.getTracks().forEach(function(track) {
-                            pc._senders.push(shimSenderWithDtmf(pc, track));
-                        });
-                    };
-
-                    var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
-                    window.RTCPeerConnection.prototype.removeStream = function(stream) {
-                        var pc = this;
-                        pc._senders = pc._senders || [];
-                        origRemoveStream.apply(pc, [stream]);
-
-                        stream.getTracks().forEach(function(track) {
-                            var sender = pc._senders.find(function(s) {
-                                return s.track === track;
-                            });
-                            if (sender) {
-                                pc._senders.splice(pc._senders.indexOf(sender), 1); // remove sender
-                            }
-                        });
-                    };
-                } else if (typeof window === 'object' && window.RTCPeerConnection &&
-                    'getSenders' in window.RTCPeerConnection.prototype &&
-                    'createDTMFSender' in window.RTCPeerConnection.prototype &&
-                    window.RTCRtpSender &&
-                    !('dtmf' in window.RTCRtpSender.prototype)) {
-                    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
-                    window.RTCPeerConnection.prototype.getSenders = function() {
-                        var pc = this;
-                        var senders = origGetSenders.apply(pc, []);
-                        senders.forEach(function(sender) {
-                            sender._pc = pc;
-                        });
-                        return senders;
-                    };
-
-                    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {
-                        get: function() {
-                            if (this._dtmf === undefined) {
-                                if (this.track.kind === 'audio') {
-                                    this._dtmf = this._pc.createDTMFSender(this.track);
-                                } else {
-                                    this._dtmf = null;
-                                }
-                            }
-                            return this._dtmf;
-                        }
-                    });
-                }
-            },
-
-            shimSenderReceiverGetStats: function(window) {
-                if (!(typeof window === 'object' && window.RTCPeerConnection &&
-                        window.RTCRtpSender && window.RTCRtpReceiver)) {
-                    return;
-                }
-
-                // shim sender stats.
-                if (!('getStats' in window.RTCRtpSender.prototype)) {
-                    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
-                    if (origGetSenders) {
-                        window.RTCPeerConnection.prototype.getSenders = function() {
-                            var pc = this;
-                            var senders = origGetSenders.apply(pc, []);
-                            senders.forEach(function(sender) {
-                                sender._pc = pc;
-                            });
-                            return senders;
-                        };
-                    }
-
-                    var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
-                    if (origAddTrack) {
-                        window.RTCPeerConnection.prototype.addTrack = function() {
-                            var sender = origAddTrack.apply(this, arguments);
-                            sender._pc = this;
-                            return sender;
-                        };
-                    }
-                    window.RTCRtpSender.prototype.getStats = function() {
-                        var sender = this;
-                        return this._pc.getStats().then(function(result) {
-                            /* Note: this will include stats of all senders that
-                             *   send a track with the same id as sender.track as
-                             *   it is not possible to identify the RTCRtpSender.
-                             */
-                            return filterStats(result, sender.track, true);
-                        });
-                    };
-                }
-
-                // shim receiver stats.
-                if (!('getStats' in window.RTCRtpReceiver.prototype)) {
-                    var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;
-                    if (origGetReceivers) {
-                        window.RTCPeerConnection.prototype.getReceivers = function() {
-                            var pc = this;
-                            var receivers = origGetReceivers.apply(pc, []);
-                            receivers.forEach(function(receiver) {
-                                receiver._pc = pc;
-                            });
-                            return receivers;
-                        };
-                    }
-                    utils.wrapPeerConnectionEvent(window, 'track', function(e) {
-                        e.receiver._pc = e.srcElement;
-                        return e;
-                    });
-                    window.RTCRtpReceiver.prototype.getStats = function() {
-                        var receiver = this;
-                        return this._pc.getStats().then(function(result) {
-                            return filterStats(result, receiver.track, false);
-                        });
-                    };
-                }
-
-                if (!('getStats' in window.RTCRtpSender.prototype &&
-                        'getStats' in window.RTCRtpReceiver.prototype)) {
-                    return;
-                }
-
-                // shim RTCPeerConnection.getStats(track).
-                var origGetStats = window.RTCPeerConnection.prototype.getStats;
-                window.RTCPeerConnection.prototype.getStats = function() {
-                    var pc = this;
-                    if (arguments.length > 0 &&
-                        arguments[0] instanceof window.MediaStreamTrack) {
-                        var track = arguments[0];
-                        var sender;
-                        var receiver;
-                        var err;
-                        pc.getSenders().forEach(function(s) {
-                            if (s.track === track) {
-                                if (sender) {
-                                    err = true;
-                                } else {
-                                    sender = s;
-                                }
-                            }
-                        });
-                        pc.getReceivers().forEach(function(r) {
-                            if (r.track === track) {
-                                if (receiver) {
-                                    err = true;
-                                } else {
-                                    receiver = r;
-                                }
-                            }
-                            return r.track === track;
-                        });
-                        if (err || (sender && receiver)) {
-                            return Promise.reject(new DOMException(
-                                'There are more than one sender or receiver for the track.',
-                                'InvalidAccessError'));
-                        } else if (sender) {
-                            return sender.getStats();
-                        } else if (receiver) {
-                            return receiver.getStats();
-                        }
-                        return Promise.reject(new DOMException(
-                            'There is no sender or receiver for the track.',
-                            'InvalidAccessError'));
-                    }
-                    return origGetStats.apply(pc, arguments);
-                };
-            },
-
-            shimSourceObject: function(window) {
-                var URL = window && window.URL;
-
-                if (typeof window === 'object') {
-                    if (window.HTMLMediaElement &&
-                        !('srcObject' in window.HTMLMediaElement.prototype)) {
-                        // Shim the srcObject property, once, when HTMLMediaElement is found.
-                        Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {
-                            get: function() {
-                                return this._srcObject;
-                            },
-                            set: function(stream) {
-                                var self = this;
-                                // Use _srcObject as a private property for this shim
-                                this._srcObject = stream;
-                                if (this.src) {
-                                    URL.revokeObjectURL(this.src);
-                                }
-
-                                if (!stream) {
-                                    this.src = '';
-                                    return undefined;
-                                }
-                                this.src = URL.createObjectURL(stream);
-                                // We need to recreate the blob url when a track is added or
-                                // removed. Doing it manually since we want to avoid a recursion.
-                                stream.addEventListener('addtrack', function() {
-                                    if (self.src) {
-                                        URL.revokeObjectURL(self.src);
-                                    }
-                                    self.src = URL.createObjectURL(stream);
-                                });
-                                stream.addEventListener('removetrack', function() {
-                                    if (self.src) {
-                                        URL.revokeObjectURL(self.src);
-                                    }
-                                    self.src = URL.createObjectURL(stream);
-                                });
-                            }
-                        });
-                    }
-                }
-            },
-
-            shimAddTrackRemoveTrackWithNative: function(window) {
-                // shim addTrack/removeTrack with native variants in order to make
-                // the interactions with legacy getLocalStreams behave as in other browsers.
-                // Keeps a mapping stream.id => [stream, rtpsenders...]
-                window.RTCPeerConnection.prototype.getLocalStreams = function() {
-                    var pc = this;
-                    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
-                    return Object.keys(this._shimmedLocalStreams).map(function(streamId) {
-                        return pc._shimmedLocalStreams[streamId][0];
-                    });
-                };
-
-                var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
-                window.RTCPeerConnection.prototype.addTrack = function(track, stream) {
-                    if (!stream) {
-                        return origAddTrack.apply(this, arguments);
-                    }
-                    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
-
-                    var sender = origAddTrack.apply(this, arguments);
-                    if (!this._shimmedLocalStreams[stream.id]) {
-                        this._shimmedLocalStreams[stream.id] = [stream, sender];
-                    } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {
-                        this._shimmedLocalStreams[stream.id].push(sender);
-                    }
-                    return sender;
-                };
-
-                var origAddStream = window.RTCPeerConnection.prototype.addStream;
-                window.RTCPeerConnection.prototype.addStream = function(stream) {
-                    var pc = this;
-                    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
-
-                    stream.getTracks().forEach(function(track) {
-                        var alreadyExists = pc.getSenders().find(function(s) {
-                            return s.track === track;
-                        });
-                        if (alreadyExists) {
-                            throw new DOMException('Track already exists.',
-                                'InvalidAccessError');
-                        }
-                    });
-                    var existingSenders = pc.getSenders();
-                    origAddStream.apply(this, arguments);
-                    var newSenders = pc.getSenders().filter(function(newSender) {
-                        return existingSenders.indexOf(newSender) === -1;
-                    });
-                    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);
-                };
-
-                var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
-                window.RTCPeerConnection.prototype.removeStream = function(stream) {
-                    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
-                    delete this._shimmedLocalStreams[stream.id];
-                    return origRemoveStream.apply(this, arguments);
-                };
-
-                var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;
-                window.RTCPeerConnection.prototype.removeTrack = function(sender) {
-                    var pc = this;
-                    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
-                    if (sender) {
-                        Object.keys(this._shimmedLocalStreams).forEach(function(streamId) {
-                            var idx = pc._shimmedLocalStreams[streamId].indexOf(sender);
-                            if (idx !== -1) {
-                                pc._shimmedLocalStreams[streamId].splice(idx, 1);
-                            }
-                            if (pc._shimmedLocalStreams[streamId].length === 1) {
-                                delete pc._shimmedLocalStreams[streamId];
-                            }
-                        });
-                    }
-                    return origRemoveTrack.apply(this, arguments);
-                };
-            },
-
-            shimAddTrackRemoveTrack: function(window) {
-                var browserDetails = utils.detectBrowser(window);
-                // shim addTrack and removeTrack.
-                if (window.RTCPeerConnection.prototype.addTrack &&
-                    browserDetails.version >= 65) {
-                    return this.shimAddTrackRemoveTrackWithNative(window);
-                }
-
-                // also shim pc.getLocalStreams when addTrack is shimmed
-                // to return the original streams.
-                var origGetLocalStreams = window.RTCPeerConnection.prototype
-                    .getLocalStreams;
-                window.RTCPeerConnection.prototype.getLocalStreams = function() {
-                    var pc = this;
-                    var nativeStreams = origGetLocalStreams.apply(this);
-                    pc._reverseStreams = pc._reverseStreams || {};
-                    return nativeStreams.map(function(stream) {
-                        return pc._reverseStreams[stream.id];
-                    });
-                };
-
-                var origAddStream = window.RTCPeerConnection.prototype.addStream;
-                window.RTCPeerConnection.prototype.addStream = function(stream) {
-                    var pc = this;
-                    pc._streams = pc._streams || {};
-                    pc._reverseStreams = pc._reverseStreams || {};
-
-                    stream.getTracks().forEach(function(track) {
-                        var alreadyExists = pc.getSenders().find(function(s) {
-                            return s.track === track;
-                        });
-                        if (alreadyExists) {
-                            throw new DOMException('Track already exists.',
-                                'InvalidAccessError');
-                        }
-                    });
-                    // Add identity mapping for consistency with addTrack.
-                    // Unless this is being used with a stream from addTrack.
-                    if (!pc._reverseStreams[stream.id]) {
-                        var newStream = new window.MediaStream(stream.getTracks());
-                        pc._streams[stream.id] = newStream;
-                        pc._reverseStreams[newStream.id] = stream;
-                        stream = newStream;
-                    }
-                    origAddStream.apply(pc, [stream]);
-                };
-
-                var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
-                window.RTCPeerConnection.prototype.removeStream = function(stream) {
-                    var pc = this;
-                    pc._streams = pc._streams || {};
-                    pc._reverseStreams = pc._reverseStreams || {};
-
-                    origRemoveStream.apply(pc, [(pc._streams[stream.id] || stream)]);
-                    delete pc._reverseStreams[(pc._streams[stream.id] ?
-                        pc._streams[stream.id].id : stream.id)];
-                    delete pc._streams[stream.id];
-                };
-
-                window.RTCPeerConnection.prototype.addTrack = function(track, stream) {
-                    var pc = this;
-                    if (pc.signalingState === 'closed') {
-                        throw new DOMException(
-                            'The RTCPeerConnection\'s signalingState is \'closed\'.',
-                            'InvalidStateError');
-                    }
-                    var streams = [].slice.call(arguments, 1);
-                    if (streams.length !== 1 ||
-                        !streams[0].getTracks().find(function(t) {
-                            return t === track;
-                        })) {
-                        // this is not fully correct but all we can manage without
-                        // [[associated MediaStreams]] internal slot.
-                        throw new DOMException(
-                            'The adapter.js addTrack polyfill only supports a single ' +
-                            ' stream which is associated with the specified track.',
-                            'NotSupportedError');
-                    }
-
-                    var alreadyExists = pc.getSenders().find(function(s) {
-                        return s.track === track;
-                    });
-                    if (alreadyExists) {
-                        throw new DOMException('Track already exists.',
-                            'InvalidAccessError');
-                    }
-
-                    pc._streams = pc._streams || {};
-                    pc._reverseStreams = pc._reverseStreams || {};
-                    var oldStream = pc._streams[stream.id];
-                    if (oldStream) {
-                        // this is using odd Chrome behaviour, use with caution:
-                        // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815
-                        // Note: we rely on the high-level addTrack/dtmf shim to
-                        // create the sender with a dtmf sender.
-                        oldStream.addTrack(track);
-
-                        // Trigger ONN async.
-                        Promise.resolve().then(function() {
-                            pc.dispatchEvent(new Event('negotiationneeded'));
-                        });
-                    } else {
-                        var newStream = new window.MediaStream([track]);
-                        pc._streams[stream.id] = newStream;
-                        pc._reverseStreams[newStream.id] = stream;
-                        pc.addStream(newStream);
-                    }
-                    return pc.getSenders().find(function(s) {
-                        return s.track === track;
-                    });
-                };
-
-                // replace the internal stream id with the external one and
-                // vice versa.
-                function replaceInternalStreamId(pc, description) {
-                    var sdp = description.sdp;
-                    Object.keys(pc._reverseStreams || []).forEach(function(internalId) {
-                        var externalStream = pc._reverseStreams[internalId];
-                        var internalStream = pc._streams[externalStream.id];
-                        sdp = sdp.replace(new RegExp(internalStream.id, 'g'),
-                            externalStream.id);
-                    });
-                    return new RTCSessionDescription({
-                        type: description.type,
-                        sdp: sdp
-                    });
-                }
-                function replaceExternalStreamId(pc, description) {
-                    var sdp = description.sdp;
-                    Object.keys(pc._reverseStreams || []).forEach(function(internalId) {
-                        var externalStream = pc._reverseStreams[internalId];
-                        var internalStream = pc._streams[externalStream.id];
-                        sdp = sdp.replace(new RegExp(externalStream.id, 'g'),
-                            internalStream.id);
-                    });
-                    return new RTCSessionDescription({
-                        type: description.type,
-                        sdp: sdp
-                    });
-                }
-                ['createOffer', 'createAnswer'].forEach(function(method) {
-                    var nativeMethod = window.RTCPeerConnection.prototype[method];
-                    window.RTCPeerConnection.prototype[method] = function() {
-                        var pc = this;
-                        var args = arguments;
-                        var isLegacyCall = arguments.length &&
-                            typeof arguments[0] === 'function';
-                        if (isLegacyCall) {
-                            return nativeMethod.apply(pc, [
-                                function(description) {
-                                    var desc = replaceInternalStreamId(pc, description);
-                                    args[0].apply(null, [desc]);
-                                },
-                                function(err) {
-                                    if (args[1]) {
-                                        args[1].apply(null, err);
-                                    }
-                                }, arguments[2]
-                            ]);
-                        }
-                        return nativeMethod.apply(pc, arguments)
-                            .then(function(description) {
-                                return replaceInternalStreamId(pc, description);
-                            });
-                    };
-                });
-
-                var origSetLocalDescription =
-                    window.RTCPeerConnection.prototype.setLocalDescription;
-                window.RTCPeerConnection.prototype.setLocalDescription = function() {
-                    var pc = this;
-                    if (!arguments.length || !arguments[0].type) {
-                        return origSetLocalDescription.apply(pc, arguments);
-                    }
-                    arguments[0] = replaceExternalStreamId(pc, arguments[0]);
-                    return origSetLocalDescription.apply(pc, arguments);
-                };
-
-                // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier
-
-                var origLocalDescription = Object.getOwnPropertyDescriptor(
-                    window.RTCPeerConnection.prototype, 'localDescription');
-                Object.defineProperty(window.RTCPeerConnection.prototype,
-                    'localDescription', {
-                        get: function() {
-                            var pc = this;
-                            var description = origLocalDescription.get.apply(this);
-                            if (description.type === '') {
-                                return description;
-                            }
-                            return replaceInternalStreamId(pc, description);
-                        }
-                    });
-
-                window.RTCPeerConnection.prototype.removeTrack = function(sender) {
-                    var pc = this;
-                    if (pc.signalingState === 'closed') {
-                        throw new DOMException(
-                            'The RTCPeerConnection\'s signalingState is \'closed\'.',
-                            'InvalidStateError');
-                    }
-                    // We can not yet check for sender instanceof RTCRtpSender
-                    // since we shim RTPSender. So we check if sender._pc is set.
-                    if (!sender._pc) {
-                        throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' +
-                            'does not implement interface RTCRtpSender.', 'TypeError');
-                    }
-                    var isLocal = sender._pc === pc;
-                    if (!isLocal) {
-                        throw new DOMException('Sender was not created by this connection.',
-                            'InvalidAccessError');
-                    }
-
-                    // Search for the native stream the senders track belongs to.
-                    pc._streams = pc._streams || {};
-                    var stream;
-                    Object.keys(pc._streams).forEach(function(streamid) {
-                        var hasTrack = pc._streams[streamid].getTracks().find(function(track) {
-                            return sender.track === track;
-                        });
-                        if (hasTrack) {
-                            stream = pc._streams[streamid];
-                        }
-                    });
-
-                    if (stream) {
-                        if (stream.getTracks().length === 1) {
-                            // if this is the last track of the stream, remove the stream. This
-                            // takes care of any shimmed _senders.
-                            pc.removeStream(pc._reverseStreams[stream.id]);
-                        } else {
-                            // relying on the same odd chrome behaviour as above.
-                            stream.removeTrack(sender.track);
-                        }
-                        pc.dispatchEvent(new Event('negotiationneeded'));
-                    }
-                };
-            },
-
-            shimPeerConnection: function(window) {
-                var browserDetails = utils.detectBrowser(window);
-
-                // The RTCPeerConnection object.
-                if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {
-                    window.RTCPeerConnection = function(pcConfig, pcConstraints) {
-                        // Translate iceTransportPolicy to iceTransports,
-                        // see https://code.google.com/p/webrtc/issues/detail?id=4869
-                        // this was fixed in M56 along with unprefixing RTCPeerConnection.
-                        logging('PeerConnection');
-                        if (pcConfig && pcConfig.iceTransportPolicy) {
-                            pcConfig.iceTransports = pcConfig.iceTransportPolicy;
-                        }
-
-                        return new window.webkitRTCPeerConnection(pcConfig, pcConstraints);
-                    };
-                    window.RTCPeerConnection.prototype =
-                        window.webkitRTCPeerConnection.prototype;
-                    // wrap static methods. Currently just generateCertificate.
-                    if (window.webkitRTCPeerConnection.generateCertificate) {
-                        Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
-                            get: function() {
-                                return window.webkitRTCPeerConnection.generateCertificate;
-                            }
-                        });
-                    }
-                }
-
-                var origGetStats = window.RTCPeerConnection.prototype.getStats;
-                window.RTCPeerConnection.prototype.getStats = function(selector,
-                                                                       successCallback, errorCallback) {
-                    var pc = this;
-                    var args = arguments;
-
-                    // If selector is a function then we are in the old style stats so just
-                    // pass back the original getStats format to avoid breaking old users.
-                    if (arguments.length > 0 && typeof selector === 'function') {
-                        return origGetStats.apply(this, arguments);
-                    }
-
-                    // When spec-style getStats is supported, return those when called with
-                    // either no arguments or the selector argument is null.
-                    if (origGetStats.length === 0 && (arguments.length === 0 ||
-                            typeof arguments[0] !== 'function')) {
-                        return origGetStats.apply(this, []);
-                    }
-
-                    var fixChromeStats_ = function(response) {
-                        var standardReport = {};
-                        var reports = response.result();
-                        reports.forEach(function(report) {
-                            var standardStats = {
-                                id: report.id,
-                                timestamp: report.timestamp,
-                                type: {
-                                    localcandidate: 'local-candidate',
-                                    remotecandidate: 'remote-candidate'
-                                }[report.type] || report.type
-                            };
-                            report.names().forEach(function(name) {
-                                standardStats[name] = report.stat(name);
-                            });
-                            standardReport[standardStats.id] = standardStats;
-                        });
-
-                        return standardReport;
-                    };
-
-                    // shim getStats with maplike support
-                    var makeMapStats = function(stats) {
-                        return new Map(Object.keys(stats).map(function(key) {
-                            return [key, stats[key]];
-                        }));
-                    };
-
-                    if (arguments.length >= 2) {
-                        var successCallbackWrapper_ = function(response) {
-                            args[1](makeMapStats(fixChromeStats_(response)));
-                        };
-
-                        return origGetStats.apply(this, [successCallbackWrapper_,
-                            arguments[0]]);
-                    }
-
-                    // promise-support
-                    return new Promise(function(resolve, reject) {
-                        origGetStats.apply(pc, [
-                            function(response) {
-                                resolve(makeMapStats(fixChromeStats_(response)));
-                            }, reject]);
-                    }).then(successCallback, errorCallback);
-                };
-
-                // add promise support -- natively available in Chrome 51
-                if (browserDetails.version < 51) {
-                    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
-                        .forEach(function(method) {
-                            var nativeMethod = window.RTCPeerConnection.prototype[method];
-                            window.RTCPeerConnection.prototype[method] = function() {
-                                var args = arguments;
-                                var pc = this;
-                                var promise = new Promise(function(resolve, reject) {
-                                    nativeMethod.apply(pc, [args[0], resolve, reject]);
-                                });
-                                if (args.length < 2) {
-                                    return promise;
-                                }
-                                return promise.then(function() {
-                                        args[1].apply(null, []);
-                                    },
-                                    function(err) {
-                                        if (args.length >= 3) {
-                                            args[2].apply(null, [err]);
-                                        }
-                                    });
-                            };
-                        });
-                }
-
-                // promise support for createOffer and createAnswer. Available (without
-                // bugs) since M52: crbug/619289
-                if (browserDetails.version < 52) {
-                    ['createOffer', 'createAnswer'].forEach(function(method) {
-                        var nativeMethod = window.RTCPeerConnection.prototype[method];
-                        window.RTCPeerConnection.prototype[method] = function() {
-                            var pc = this;
-                            if (arguments.length < 1 || (arguments.length === 1 &&
-                                    typeof arguments[0] === 'object')) {
-                                var opts = arguments.length === 1 ? arguments[0] : undefined;
-                                return new Promise(function(resolve, reject) {
-                                    nativeMethod.apply(pc, [resolve, reject, opts]);
-                                });
-                            }
-                            return nativeMethod.apply(this, arguments);
-                        };
-                    });
-                }
-
-                // shim implicit creation of RTCSessionDescription/RTCIceCandidate
-                ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
-                    .forEach(function(method) {
-                        var nativeMethod = window.RTCPeerConnection.prototype[method];
-                        window.RTCPeerConnection.prototype[method] = function() {
-                            arguments[0] = new ((method === 'addIceCandidate') ?
-                                window.RTCIceCandidate :
-                                window.RTCSessionDescription)(arguments[0]);
-                            return nativeMethod.apply(this, arguments);
-                        };
-                    });
-
-                // support for addIceCandidate(null or undefined)
-                var nativeAddIceCandidate =
-                    window.RTCPeerConnection.prototype.addIceCandidate;
-                window.RTCPeerConnection.prototype.addIceCandidate = function() {
-                    if (!arguments[0]) {
-                        if (arguments[1]) {
-                            arguments[1].apply(null);
-                        }
-                        return Promise.resolve();
-                    }
-                    return nativeAddIceCandidate.apply(this, arguments);
-                };
-            },
-
-            fixNegotiationNeeded: function(window) {
-                utils.wrapPeerConnectionEvent(window, 'negotiationneeded', function(e) {
-                    var pc = e.target;
-                    if (pc.signalingState !== 'stable') {
-                        return;
-                    }
-                    return e;
-                });
-            },
-
-            shimGetDisplayMedia: function(window, getSourceId) {
-                if ('getDisplayMedia' in window.navigator) {
-                    return;
-                }
-                // getSourceId is a function that returns a promise resolving with
-                // the sourceId of the screen/window/tab to be shared.
-                if (typeof getSourceId !== 'function') {
-                    console.error('shimGetDisplayMedia: getSourceId argument is not ' +
-                        'a function');
-                    return;
-                }
-                navigator.getDisplayMedia = function(constraints) {
-                    return getSourceId(constraints)
-                        .then(function(sourceId) {
-                            constraints.video = {
-                                mandatory: {
-                                    chromeMediaSource: 'desktop',
-                                    chromeMediaSourceId: sourceId,
-                                    maxFrameRate: constraints.video.frameRate || 3
-                                }
-                            };
-                            return navigator.mediaDevices.getUserMedia(constraints);
-                        });
-                };
-            }
-        };
-
-    },{"../utils.js":14,"./getusermedia":6}],6:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-        'use strict';
-        var utils = require('../utils.js');
-        var logging = utils.log;
-
-        // Expose public methods.
-        module.exports = function(window) {
-            var browserDetails = utils.detectBrowser(window);
-            var navigator = window && window.navigator;
-
-            var constraintsToChrome_ = function(c) {
-                if (typeof c !== 'object' || c.mandatory || c.optional) {
-                    return c;
-                }
-                var cc = {};
-                Object.keys(c).forEach(function(key) {
-                    if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
-                        return;
-                    }
-                    var r = (typeof c[key] === 'object') ? c[key] : {ideal: c[key]};
-                    if (r.exact !== undefined && typeof r.exact === 'number') {
-                        r.min = r.max = r.exact;
-                    }
-                    var oldname_ = function(prefix, name) {
-                        if (prefix) {
-                            return prefix + name.charAt(0).toUpperCase() + name.slice(1);
-                        }
-                        return (name === 'deviceId') ? 'sourceId' : name;
-                    };
-                    if (r.ideal !== undefined) {
-                        cc.optional = cc.optional || [];
-                        var oc = {};
-                        if (typeof r.ideal === 'number') {
-                            oc[oldname_('min', key)] = r.ideal;
-                            cc.optional.push(oc);
-                            oc = {};
-                            oc[oldname_('max', key)] = r.ideal;
-                            cc.optional.push(oc);
-                        } else {
-                            oc[oldname_('', key)] = r.ideal;
-                            cc.optional.push(oc);
-                        }
-                    }
-                    if (r.exact !== undefined && typeof r.exact !== 'number') {
-                        cc.mandatory = cc.mandatory || {};
-                        cc.mandatory[oldname_('', key)] = r.exact;
-                    } else {
-                        ['min', 'max'].forEach(function(mix) {
-                            if (r[mix] !== undefined) {
-                                cc.mandatory = cc.mandatory || {};
-                                cc.mandatory[oldname_(mix, key)] = r[mix];
-                            }
-                        });
-                    }
-                });
-                if (c.advanced) {
-                    cc.optional = (cc.optional || []).concat(c.advanced);
-                }
-                return cc;
-            };
-
-            var shimConstraints_ = function(constraints, func) {
-                if (browserDetails.version >= 61) {
-                    return func(constraints);
-                }
-                constraints = JSON.parse(JSON.stringify(constraints));
-                if (constraints && typeof constraints.audio === 'object') {
-                    var remap = function(obj, a, b) {
-                        if (a in obj && !(b in obj)) {
-                            obj[b] = obj[a];
-                            delete obj[a];
-                        }
-                    };
-                    constraints = JSON.parse(JSON.stringify(constraints));
-                    remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');
-                    remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');
-                    constraints.audio = constraintsToChrome_(constraints.audio);
-                }
-                if (constraints && typeof constraints.video === 'object') {
-                    // Shim facingMode for mobile & surface pro.
-                    var face = constraints.video.facingMode;
-                    face = face && ((typeof face === 'object') ? face : {ideal: face});
-                    var getSupportedFacingModeLies = browserDetails.version < 66;
-
-                    if ((face && (face.exact === 'user' || face.exact === 'environment' ||
-                            face.ideal === 'user' || face.ideal === 'environment')) &&
-                        !(navigator.mediaDevices.getSupportedConstraints &&
-                            navigator.mediaDevices.getSupportedConstraints().facingMode &&
-                            !getSupportedFacingModeLies)) {
-                        delete constraints.video.facingMode;
-                        var matches;
-                        if (face.exact === 'environment' || face.ideal === 'environment') {
-                            matches = ['back', 'rear'];
-                        } else if (face.exact === 'user' || face.ideal === 'user') {
-                            matches = ['front'];
-                        }
-                        if (matches) {
-                            // Look for matches in label, or use last cam for back (typical).
-                            return navigator.mediaDevices.enumerateDevices()
-                                .then(function(devices) {
-                                    devices = devices.filter(function(d) {
-                                        return d.kind === 'videoinput';
-                                    });
-                                    var dev = devices.find(function(d) {
-                                        return matches.some(function(match) {
-                                            return d.label.toLowerCase().indexOf(match) !== -1;
-                                        });
-                                    });
-                                    if (!dev && devices.length && matches.indexOf('back') !== -1) {
-                                        dev = devices[devices.length - 1]; // more likely the back cam
-                                    }
-                                    if (dev) {
-                                        constraints.video.deviceId = face.exact ? {exact: dev.deviceId} :
-                                            {ideal: dev.deviceId};
-                                    }
-                                    constraints.video = constraintsToChrome_(constraints.video);
-                                    logging('chrome: ' + JSON.stringify(constraints));
-                                    return func(constraints);
-                                });
-                        }
-                    }
-                    constraints.video = constraintsToChrome_(constraints.video);
-                }
-                logging('chrome: ' + JSON.stringify(constraints));
-                return func(constraints);
-            };
-
-            var shimError_ = function(e) {
-                if (browserDetails.version >= 64) {
-                    return e;
-                }
-                return {
-                    name: {
-                        PermissionDeniedError: 'NotAllowedError',
-                        PermissionDismissedError: 'NotAllowedError',
-                        InvalidStateError: 'NotAllowedError',
-                        DevicesNotFoundError: 'NotFoundError',
-                        ConstraintNotSatisfiedError: 'OverconstrainedError',
-                        TrackStartError: 'NotReadableError',
-                        MediaDeviceFailedDueToShutdown: 'NotAllowedError',
-                        MediaDeviceKillSwitchOn: 'NotAllowedError',
-                        TabCaptureError: 'AbortError',
-                        ScreenCaptureError: 'AbortError',
-                        DeviceCaptureError: 'AbortError'
-                    }[e.name] || e.name,
-                    message: e.message,
-                    constraint: e.constraint || e.constraintName,
-                    toString: function() {
-                        return this.name + (this.message && ': ') + this.message;
-                    }
-                };
-            };
-
-            var getUserMedia_ = function(constraints, onSuccess, onError) {
-                shimConstraints_(constraints, function(c) {
-                    navigator.webkitGetUserMedia(c, onSuccess, function(e) {
-                        if (onError) {
-                            onError(shimError_(e));
-                        }
-                    });
-                });
-            };
-
-            navigator.getUserMedia = getUserMedia_;
-
-            // Returns the result of getUserMedia as a Promise.
-            var getUserMediaPromise_ = function(constraints) {
-                return new Promise(function(resolve, reject) {
-                    navigator.getUserMedia(constraints, resolve, reject);
-                });
-            };
-
-            if (!navigator.mediaDevices) {
-                navigator.mediaDevices = {
-                    getUserMedia: getUserMediaPromise_,
-                    enumerateDevices: function() {
-                        return new Promise(function(resolve) {
-                            var kinds = {audio: 'audioinput', video: 'videoinput'};
-                            return window.MediaStreamTrack.getSources(function(devices) {
-                                resolve(devices.map(function(device) {
-                                    return {label: device.label,
-                                        kind: kinds[device.kind],
-                                        deviceId: device.id,
-                                        groupId: ''};
-                                }));
-                            });
-                        });
-                    },
-                    getSupportedConstraints: function() {
-                        return {
-                            deviceId: true, echoCancellation: true, facingMode: true,
-                            frameRate: true, height: true, width: true
-                        };
-                    }
-                };
-            }
-
-            // A shim for getUserMedia method on the mediaDevices object.
-            // TODO(KaptenJansson) remove once implemented in Chrome stable.
-            if (!navigator.mediaDevices.getUserMedia) {
-                navigator.mediaDevices.getUserMedia = function(constraints) {
-                    return getUserMediaPromise_(constraints);
-                };
-            } else {
-                // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia
-                // function which returns a Promise, it does not accept spec-style
-                // constraints.
-                var origGetUserMedia = navigator.mediaDevices.getUserMedia.
-                bind(navigator.mediaDevices);
-                navigator.mediaDevices.getUserMedia = function(cs) {
-                    return shimConstraints_(cs, function(c) {
-                        return origGetUserMedia(c).then(function(stream) {
-                            if (c.audio && !stream.getAudioTracks().length ||
-                                c.video && !stream.getVideoTracks().length) {
-                                stream.getTracks().forEach(function(track) {
-                                    track.stop();
-                                });
-                                throw new DOMException('', 'NotFoundError');
-                            }
-                            return stream;
-                        }, function(e) {
-                            return Promise.reject(shimError_(e));
-                        });
-                    });
-                };
-            }
-
-            // Dummy devicechange event methods.
-            // TODO(KaptenJansson) remove once implemented in Chrome stable.
-            if (typeof navigator.mediaDevices.addEventListener === 'undefined') {
-                navigator.mediaDevices.addEventListener = function() {
-                    logging('Dummy mediaDevices.addEventListener called.');
-                };
-            }
-            if (typeof navigator.mediaDevices.removeEventListener === 'undefined') {
-                navigator.mediaDevices.removeEventListener = function() {
-                    logging('Dummy mediaDevices.removeEventListener called.');
-                };
-            }
-        };
-
-    },{"../utils.js":14}],7:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-        'use strict';
-
-        var SDPUtils = require('sdp');
-        var utils = require('./utils');
-
-        module.exports = {
-            shimRTCIceCandidate: function(window) {
-                // foundation is arbitrarily chosen as an indicator for full support for
-                // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface
-                if (!window.RTCIceCandidate || (window.RTCIceCandidate && 'foundation' in
-                        window.RTCIceCandidate.prototype)) {
-                    return;
-                }
-
-                var NativeRTCIceCandidate = window.RTCIceCandidate;
-                window.RTCIceCandidate = function(args) {
-                    // Remove the a= which shouldn't be part of the candidate string.
-                    if (typeof args === 'object' && args.candidate &&
-                        args.candidate.indexOf('a=') === 0) {
-                        args = JSON.parse(JSON.stringify(args));
-                        args.candidate = args.candidate.substr(2);
-                    }
-
-                    if (args.candidate && args.candidate.length) {
-                        // Augment the native candidate with the parsed fields.
-                        var nativeCandidate = new NativeRTCIceCandidate(args);
-                        var parsedCandidate = SDPUtils.parseCandidate(args.candidate);
-                        var augmentedCandidate = Object.assign(nativeCandidate,
-                            parsedCandidate);
-
-                        // Add a serializer that does not serialize the extra attributes.
-                        augmentedCandidate.toJSON = function() {
-                            return {
-                                candidate: augmentedCandidate.candidate,
-                                sdpMid: augmentedCandidate.sdpMid,
-                                sdpMLineIndex: augmentedCandidate.sdpMLineIndex,
-                                usernameFragment: augmentedCandidate.usernameFragment,
-                            };
-                        };
-                        return augmentedCandidate;
-                    }
-                    return new NativeRTCIceCandidate(args);
-                };
-                window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype;
-
-                // Hook up the augmented candidate in onicecandidate and
-                // addEventListener('icecandidate', ...)
-                utils.wrapPeerConnectionEvent(window, 'icecandidate', function(e) {
-                    if (e.candidate) {
-                        Object.defineProperty(e, 'candidate', {
-                            value: new window.RTCIceCandidate(e.candidate),
-                            writable: 'false'
-                        });
-                    }
-                    return e;
-                });
-            },
-
-            // shimCreateObjectURL must be called before shimSourceObject to avoid loop.
-
-            shimCreateObjectURL: function(window) {
-                var URL = window && window.URL;
-
-                if (!(typeof window === 'object' && window.HTMLMediaElement &&
-                        'srcObject' in window.HTMLMediaElement.prototype &&
-                        URL.createObjectURL && URL.revokeObjectURL)) {
-                    // Only shim CreateObjectURL using srcObject if srcObject exists.
-                    return undefined;
-                }
-
-                var nativeCreateObjectURL = URL.createObjectURL.bind(URL);
-                var nativeRevokeObjectURL = URL.revokeObjectURL.bind(URL);
-                var streams = new Map(), newId = 0;
-
-                URL.createObjectURL = function(stream) {
-                    if ('getTracks' in stream) {
-                        var url = 'polyblob:' + (++newId);
-                        streams.set(url, stream);
-                        utils.deprecated('URL.createObjectURL(stream)',
-                            'elem.srcObject = stream');
-                        return url;
-                    }
-                    return nativeCreateObjectURL(stream);
-                };
-                URL.revokeObjectURL = function(url) {
-                    nativeRevokeObjectURL(url);
-                    streams.delete(url);
-                };
-
-                var dsc = Object.getOwnPropertyDescriptor(window.HTMLMediaElement.prototype,
-                    'src');
-                Object.defineProperty(window.HTMLMediaElement.prototype, 'src', {
-                    get: function() {
-                        return dsc.get.apply(this);
-                    },
-                    set: function(url) {
-                        this.srcObject = streams.get(url) || null;
-                        return dsc.set.apply(this, [url]);
-                    }
-                });
-
-                var nativeSetAttribute = window.HTMLMediaElement.prototype.setAttribute;
-                window.HTMLMediaElement.prototype.setAttribute = function() {
-                    if (arguments.length === 2 &&
-                        ('' + arguments[0]).toLowerCase() === 'src') {
-                        this.srcObject = streams.get(arguments[1]) || null;
-                    }
-                    return nativeSetAttribute.apply(this, arguments);
-                };
-            },
-
-            shimMaxMessageSize: function(window) {
-                if (window.RTCSctpTransport || !window.RTCPeerConnection) {
-                    return;
-                }
-                var browserDetails = utils.detectBrowser(window);
-
-                if (!('sctp' in window.RTCPeerConnection.prototype)) {
-                    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {
-                        get: function() {
-                            return typeof this._sctp === 'undefined' ? null : this._sctp;
-                        }
-                    });
-                }
-
-                var sctpInDescription = function(description) {
-                    var sections = SDPUtils.splitSections(description.sdp);
-                    sections.shift();
-                    return sections.some(function(mediaSection) {
-                        var mLine = SDPUtils.parseMLine(mediaSection);
-                        return mLine && mLine.kind === 'application'
-                            && mLine.protocol.indexOf('SCTP') !== -1;
-                    });
-                };
-
-                var getRemoteFirefoxVersion = function(description) {
-                    // TODO: Is there a better solution for detecting Firefox?
-                    var match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\d+)/);
-                    if (match === null || match.length < 2) {
-                        return -1;
-                    }
-                    var version = parseInt(match[1], 10);
-                    // Test for NaN (yes, this is ugly)
-                    return version !== version ? -1 : version;
-                };
-
-                var getCanSendMaxMessageSize = function(remoteIsFirefox) {
-                    // Every implementation we know can send at least 64 KiB.
-                    // Note: Although Chrome is technically able to send up to 256 KiB, the
-                    //       data does not reach the other peer reliably.
-                    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419
-                    var canSendMaxMessageSize = 65536;
-                    if (browserDetails.browser === 'firefox') {
-                        if (browserDetails.version < 57) {
-                            if (remoteIsFirefox === -1) {
-                                // FF < 57 will send in 16 KiB chunks using the deprecated PPID
-                                // fragmentation.
-                                canSendMaxMessageSize = 16384;
-                            } else {
-                                // However, other FF (and RAWRTC) can reassemble PPID-fragmented
-                                // messages. Thus, supporting ~2 GiB when sending.
-                                canSendMaxMessageSize = 2147483637;
-                            }
-                        } else if (browserDetails.version < 60) {
-                            // Currently, all FF >= 57 will reset the remote maximum message size
-                            // to the default value when a data channel is created at a later
-                            // stage. :(
-                            // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831
-                            canSendMaxMessageSize =
-                                browserDetails.version === 57 ? 65535 : 65536;
-                        } else {
-                            // FF >= 60 supports sending ~2 GiB
-                            canSendMaxMessageSize = 2147483637;
-                        }
-                    }
-                    return canSendMaxMessageSize;
-                };
-
-                var getMaxMessageSize = function(description, remoteIsFirefox) {
-                    // Note: 65536 bytes is the default value from the SDP spec. Also,
-                    //       every implementation we know supports receiving 65536 bytes.
-                    var maxMessageSize = 65536;
-
-                    // FF 57 has a slightly incorrect default remote max message size, so
-                    // we need to adjust it here to avoid a failure when sending.
-                    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697
-                    if (browserDetails.browser === 'firefox'
-                        && browserDetails.version === 57) {
-                        maxMessageSize = 65535;
-                    }
-
-                    var match = SDPUtils.matchPrefix(description.sdp, 'a=max-message-size:');
-                    if (match.length > 0) {
-                        maxMessageSize = parseInt(match[0].substr(19), 10);
-                    } else if (browserDetails.browser === 'firefox' &&
-                        remoteIsFirefox !== -1) {
-                        // If the maximum message size is not present in the remote SDP and
-                        // both local and remote are Firefox, the remote peer can receive
-                        // ~2 GiB.
-                        maxMessageSize = 2147483637;
-                    }
-                    return maxMessageSize;
-                };
-
-                var origSetRemoteDescription =
-                    window.RTCPeerConnection.prototype.setRemoteDescription;
-                window.RTCPeerConnection.prototype.setRemoteDescription = function() {
-                    var pc = this;
-                    pc._sctp = null;
-
-                    if (sctpInDescription(arguments[0])) {
-                        // Check if the remote is FF.
-                        var isFirefox = getRemoteFirefoxVersion(arguments[0]);
-
-                        // Get the maximum message size the local peer is capable of sending
-                        var canSendMMS = getCanSendMaxMessageSize(isFirefox);
-
-                        // Get the maximum message size of the remote peer.
-                        var remoteMMS = getMaxMessageSize(arguments[0], isFirefox);
-
-                        // Determine final maximum message size
-                        var maxMessageSize;
-                        if (canSendMMS === 0 && remoteMMS === 0) {
-                            maxMessageSize = Number.POSITIVE_INFINITY;
-                        } else if (canSendMMS === 0 || remoteMMS === 0) {
-                            maxMessageSize = Math.max(canSendMMS, remoteMMS);
-                        } else {
-                            maxMessageSize = Math.min(canSendMMS, remoteMMS);
-                        }
-
-                        // Create a dummy RTCSctpTransport object and the 'maxMessageSize'
-                        // attribute.
-                        var sctp = {};
-                        Object.defineProperty(sctp, 'maxMessageSize', {
-                            get: function() {
-                                return maxMessageSize;
-                            }
-                        });
-                        pc._sctp = sctp;
-                    }
-
-                    return origSetRemoteDescription.apply(pc, arguments);
-                };
-            },
-
-            shimSendThrowTypeError: function(window) {
-                if (!(window.RTCPeerConnection &&
-                        'createDataChannel' in window.RTCPeerConnection.prototype)) {
-                    return;
-                }
-
-                // Note: Although Firefox >= 57 has a native implementation, the maximum
-                //       message size can be reset for all data channels at a later stage.
-                //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831
-
-                function wrapDcSend(dc, pc) {
-                    var origDataChannelSend = dc.send;
-                    dc.send = function() {
-                        var data = arguments[0];
-                        var length = data.length || data.size || data.byteLength;
-                        if (dc.readyState === 'open' &&
-                            pc.sctp && length > pc.sctp.maxMessageSize) {
-                            throw new TypeError('Message too large (can send a maximum of ' +
-                                pc.sctp.maxMessageSize + ' bytes)');
-                        }
-                        return origDataChannelSend.apply(dc, arguments);
-                    };
-                }
-                var origCreateDataChannel =
-                    window.RTCPeerConnection.prototype.createDataChannel;
-                window.RTCPeerConnection.prototype.createDataChannel = function() {
-                    var pc = this;
-                    var dataChannel = origCreateDataChannel.apply(pc, arguments);
-                    wrapDcSend(dataChannel, pc);
-                    return dataChannel;
-                };
-                utils.wrapPeerConnectionEvent(window, 'datachannel', function(e) {
-                    wrapDcSend(e.channel, e.target);
-                    return e;
-                });
-            }
-        };
-
-    },{"./utils":14,"sdp":2}],8:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-        'use strict';
-
-        var utils = require('../utils');
-        var filterIceServers = require('./filtericeservers');
-        var shimRTCPeerConnection = require('rtcpeerconnection-shim');
-
-        module.exports = {
-            shimGetUserMedia: require('./getusermedia'),
-            shimPeerConnection: function(window) {
-                var browserDetails = utils.detectBrowser(window);
-
-                if (window.RTCIceGatherer) {
-                    if (!window.RTCIceCandidate) {
-                        window.RTCIceCandidate = function(args) {
-                            return args;
-                        };
-                    }
-                    if (!window.RTCSessionDescription) {
-                        window.RTCSessionDescription = function(args) {
-                            return args;
-                        };
-                    }
-                    // this adds an additional event listener to MediaStrackTrack that signals
-                    // when a tracks enabled property was changed. Workaround for a bug in
-                    // addStream, see below. No longer required in 15025+
-                    if (browserDetails.version < 15025) {
-                        var origMSTEnabled = Object.getOwnPropertyDescriptor(
-                            window.MediaStreamTrack.prototype, 'enabled');
-                        Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {
-                            set: function(value) {
-                                origMSTEnabled.set.call(this, value);
-                                var ev = new Event('enabled');
-                                ev.enabled = value;
-                                this.dispatchEvent(ev);
-                            }
-                        });
-                    }
-                }
-
-                // ORTC defines the DTMF sender a bit different.
-                // https://github.com/w3c/ortc/issues/714
-                if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {
-                    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {
-                        get: function() {
-                            if (this._dtmf === undefined) {
-                                if (this.track.kind === 'audio') {
-                                    this._dtmf = new window.RTCDtmfSender(this);
-                                } else if (this.track.kind === 'video') {
-                                    this._dtmf = null;
-                                }
-                            }
-                            return this._dtmf;
-                        }
-                    });
-                }
-                // Edge currently only implements the RTCDtmfSender, not the
-                // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*
-                if (window.RTCDtmfSender && !window.RTCDTMFSender) {
-                    window.RTCDTMFSender = window.RTCDtmfSender;
-                }
-
-                var RTCPeerConnectionShim = shimRTCPeerConnection(window,
-                    browserDetails.version);
-                window.RTCPeerConnection = function(config) {
-                    if (config && config.iceServers) {
-                        config.iceServers = filterIceServers(config.iceServers);
-                    }
-                    return new RTCPeerConnectionShim(config);
-                };
-                window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;
-            },
-            shimReplaceTrack: function(window) {
-                // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614
-                if (window.RTCRtpSender &&
-                    !('replaceTrack' in window.RTCRtpSender.prototype)) {
-                    window.RTCRtpSender.prototype.replaceTrack =
-                        window.RTCRtpSender.prototype.setTrack;
-                }
-            }
-        };
-
-    },{"../utils":14,"./filtericeservers":9,"./getusermedia":10,"rtcpeerconnection-shim":1}],9:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-        'use strict';
-
-        var utils = require('../utils');
-        // Edge does not like
-        // 1) stun: filtered after 14393 unless ?transport=udp is present
-        // 2) turn: that does not have all of turn:host:port?transport=udp
-        // 3) turn: with ipv6 addresses
-        // 4) turn: occurring muliple times
-        module.exports = function(iceServers, edgeVersion) {
-            var hasTurn = false;
-            iceServers = JSON.parse(JSON.stringify(iceServers));
-            return iceServers.filter(function(server) {
-                if (server && (server.urls || server.url)) {
-                    var urls = server.urls || server.url;
-                    if (server.url && !server.urls) {
-                        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');
-                    }
-                    var isString = typeof urls === 'string';
-                    if (isString) {
-                        urls = [urls];
-                    }
-                    urls = urls.filter(function(url) {
-                        var validTurn = url.indexOf('turn:') === 0 &&
-                            url.indexOf('transport=udp') !== -1 &&
-                            url.indexOf('turn:[') === -1 &&
-                            !hasTurn;
-
-                        if (validTurn) {
-                            hasTurn = true;
-                            return true;
-                        }
-                        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&
-                            url.indexOf('?transport=udp') === -1;
-                    });
-
-                    delete server.url;
-                    server.urls = isString ? urls[0] : urls;
-                    return !!urls.length;
-                }
-            });
-        };
-
-    },{"../utils":14}],10:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-        'use strict';
-
-        // Expose public methods.
-        module.exports = function(window) {
-            var navigator = window && window.navigator;
-
-            var shimError_ = function(e) {
-                return {
-                    name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,
-                    message: e.message,
-                    constraint: e.constraint,
-                    toString: function() {
-                        return this.name;
-                    }
-                };
-            };
-
-            // getUserMedia error shim.
-            var origGetUserMedia = navigator.mediaDevices.getUserMedia.
-            bind(navigator.mediaDevices);
-            navigator.mediaDevices.getUserMedia = function(c) {
-                return origGetUserMedia(c).catch(function(e) {
-                    return Promise.reject(shimError_(e));
-                });
-            };
-        };
-
-    },{}],11:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-        'use strict';
-
-        var utils = require('../utils');
-
-        module.exports = {
-            shimGetUserMedia: require('./getusermedia'),
-            shimOnTrack: function(window) {
-                if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in
-                        window.RTCPeerConnection.prototype)) {
-                    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
-                        get: function() {
-                            return this._ontrack;
-                        },
-                        set: function(f) {
-                            if (this._ontrack) {
-                                this.removeEventListener('track', this._ontrack);
-                                this.removeEventListener('addstream', this._ontrackpoly);
-                            }
-                            this.addEventListener('track', this._ontrack = f);
-                            this.addEventListener('addstream', this._ontrackpoly = function(e) {
-                                e.stream.getTracks().forEach(function(track) {
-                                    var event = new Event('track');
-                                    event.track = track;
-                                    event.receiver = {track: track};
-                                    event.transceiver = {receiver: event.receiver};
-                                    event.streams = [e.stream];
-                                    this.dispatchEvent(event);
-                                }.bind(this));
-                            }.bind(this));
-                        },
-                        enumerable: true,
-                        configurable: true
-                    });
-                }
-                if (typeof window === 'object' && window.RTCTrackEvent &&
-                    ('receiver' in window.RTCTrackEvent.prototype) &&
-                    !('transceiver' in window.RTCTrackEvent.prototype)) {
-                    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
-                        get: function() {
-                            return {receiver: this.receiver};
-                        }
-                    });
-                }
-            },
-
-            shimSourceObject: function(window) {
-                // Firefox has supported mozSrcObject since FF22, unprefixed in 42.
-                if (typeof window === 'object') {
-                    if (window.HTMLMediaElement &&
-                        !('srcObject' in window.HTMLMediaElement.prototype)) {
-                        // Shim the srcObject property, once, when HTMLMediaElement is found.
-                        Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {
-                            get: function() {
-                                return this.mozSrcObject;
-                            },
-                            set: function(stream) {
-                                this.mozSrcObject = stream;
-                            }
-                        });
-                    }
-                }
-            },
-
-            shimPeerConnection: function(window) {
-                var browserDetails = utils.detectBrowser(window);
-
-                if (typeof window !== 'object' || !(window.RTCPeerConnection ||
-                        window.mozRTCPeerConnection)) {
-                    return; // probably media.peerconnection.enabled=false in about:config
-                }
-                // The RTCPeerConnection object.
-                if (!window.RTCPeerConnection) {
-                    window.RTCPeerConnection = function(pcConfig, pcConstraints) {
-                        if (browserDetails.version < 38) {
-                            // .urls is not supported in FF < 38.
-                            // create RTCIceServers with a single url.
-                            if (pcConfig && pcConfig.iceServers) {
-                                var newIceServers = [];
-                                for (var i = 0; i < pcConfig.iceServers.length; i++) {
-                                    var server = pcConfig.iceServers[i];
-                                    if (server.hasOwnProperty('urls')) {
-                                        for (var j = 0; j < server.urls.length; j++) {
-                                            var newServer = {
-                                                url: server.urls[j]
-                                            };
-                                            if (server.urls[j].indexOf('turn') === 0) {
-                                                newServer.username = server.username;
-                                                newServer.credential = server.credential;
-                                            }
-                                            newIceServers.push(newServer);
-                                        }
-                                    } else {
-                                        newIceServers.push(pcConfig.iceServers[i]);
-                                    }
-                                }
-                                pcConfig.iceServers = newIceServers;
-                            }
-                        }
-                        return new window.mozRTCPeerConnection(pcConfig, pcConstraints);
-                    };
-                    window.RTCPeerConnection.prototype =
-                        window.mozRTCPeerConnection.prototype;
-
-                    // wrap static methods. Currently just generateCertificate.
-                    if (window.mozRTCPeerConnection.generateCertificate) {
-                        Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
-                            get: function() {
-                                return window.mozRTCPeerConnection.generateCertificate;
-                            }
-                        });
-                    }
-
-                    window.RTCSessionDescription = window.mozRTCSessionDescription;
-                    window.RTCIceCandidate = window.mozRTCIceCandidate;
-                }
-
-                // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.
-                ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
-                    .forEach(function(method) {
-                        var nativeMethod = window.RTCPeerConnection.prototype[method];
-                        window.RTCPeerConnection.prototype[method] = function() {
-                            arguments[0] = new ((method === 'addIceCandidate') ?
-                                window.RTCIceCandidate :
-                                window.RTCSessionDescription)(arguments[0]);
-                            return nativeMethod.apply(this, arguments);
-                        };
-                    });
-
-                // support for addIceCandidate(null or undefined)
-                var nativeAddIceCandidate =
-                    window.RTCPeerConnection.prototype.addIceCandidate;
-                window.RTCPeerConnection.prototype.addIceCandidate = function() {
-                    if (!arguments[0]) {
-                        if (arguments[1]) {
-                            arguments[1].apply(null);
-                        }
-                        return Promise.resolve();
-                    }
-                    return nativeAddIceCandidate.apply(this, arguments);
-                };
-
-                // shim getStats with maplike support
-                var makeMapStats = function(stats) {
-                    var map = new Map();
-                    Object.keys(stats).forEach(function(key) {
-                        map.set(key, stats[key]);
-                        map[key] = stats[key];
-                    });
-                    return map;
-                };
-
-                var modernStatsTypes = {
-                    inboundrtp: 'inbound-rtp',
-                    outboundrtp: 'outbound-rtp',
-                    candidatepair: 'candidate-pair',
-                    localcandidate: 'local-candidate',
-                    remotecandidate: 'remote-candidate'
-                };
-
-                var nativeGetStats = window.RTCPeerConnection.prototype.getStats;
-                window.RTCPeerConnection.prototype.getStats = function(
-                    selector,
-                    onSucc,
-                    onErr
-                ) {
-                    return nativeGetStats.apply(this, [selector || null])
-                        .then(function(stats) {
-                            if (browserDetails.version < 48) {
-                                stats = makeMapStats(stats);
-                            }
-                            if (browserDetails.version < 53 && !onSucc) {
-                                // Shim only promise getStats with spec-hyphens in type names
-                                // Leave callback version alone; misc old uses of forEach before Map
-                                try {
-                                    stats.forEach(function(stat) {
-                                        stat.type = modernStatsTypes[stat.type] || stat.type;
-                                    });
-                                } catch (e) {
-                                    if (e.name !== 'TypeError') {
-                                        throw e;
-                                    }
-                                    // Avoid TypeError: "type" is read-only, in old versions. 34-43ish
-                                    stats.forEach(function(stat, i) {
-                                        stats.set(i, Object.assign({}, stat, {
-                                            type: modernStatsTypes[stat.type] || stat.type
-                                        }));
-                                    });
-                                }
-                            }
-                            return stats;
-                        })
-                        .then(onSucc, onErr);
-                };
-            },
-
-            shimSenderGetStats: function(window) {
-                if (!(typeof window === 'object' && window.RTCPeerConnection &&
-                        window.RTCRtpSender)) {
-                    return;
-                }
-                if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {
-                    return;
-                }
-                var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
-                if (origGetSenders) {
-                    window.RTCPeerConnection.prototype.getSenders = function() {
-                        var pc = this;
-                        var senders = origGetSenders.apply(pc, []);
-                        senders.forEach(function(sender) {
-                            sender._pc = pc;
-                        });
-                        return senders;
-                    };
-                }
-
-                var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
-                if (origAddTrack) {
-                    window.RTCPeerConnection.prototype.addTrack = function() {
-                        var sender = origAddTrack.apply(this, arguments);
-                        sender._pc = this;
-                        return sender;
-                    };
-                }
-                window.RTCRtpSender.prototype.getStats = function() {
-                    return this.track ? this._pc.getStats(this.track) :
-                        Promise.resolve(new Map());
-                };
-            },
-
-            shimReceiverGetStats: function(window) {
-                if (!(typeof window === 'object' && window.RTCPeerConnection &&
-                        window.RTCRtpSender)) {
-                    return;
-                }
-                if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {
-                    return;
-                }
-                var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;
-                if (origGetReceivers) {
-                    window.RTCPeerConnection.prototype.getReceivers = function() {
-                        var pc = this;
-                        var receivers = origGetReceivers.apply(pc, []);
-                        receivers.forEach(function(receiver) {
-                            receiver._pc = pc;
-                        });
-                        return receivers;
-                    };
-                }
-                utils.wrapPeerConnectionEvent(window, 'track', function(e) {
-                    e.receiver._pc = e.srcElement;
-                    return e;
-                });
-                window.RTCRtpReceiver.prototype.getStats = function() {
-                    return this._pc.getStats(this.track);
-                };
-            },
-
-            shimRemoveStream: function(window) {
-                if (!window.RTCPeerConnection ||
-                    'removeStream' in window.RTCPeerConnection.prototype) {
-                    return;
-                }
-                window.RTCPeerConnection.prototype.removeStream = function(stream) {
-                    var pc = this;
-                    utils.deprecated('removeStream', 'removeTrack');
-                    this.getSenders().forEach(function(sender) {
-                        if (sender.track && stream.getTracks().indexOf(sender.track) !== -1) {
-                            pc.removeTrack(sender);
-                        }
-                    });
-                };
-            },
-
-            shimRTCDataChannel: function(window) {
-                // rename DataChannel to RTCDataChannel (native fix in FF60):
-                // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851
-                if (window.DataChannel && !window.RTCDataChannel) {
-                    window.RTCDataChannel = window.DataChannel;
-                }
-            },
-
-            shimGetDisplayMedia: function(window, preferredMediaSource) {
-                if ('getDisplayMedia' in window.navigator) {
-                    return;
-                }
-                navigator.getDisplayMedia = function(constraints) {
-                    if (!(constraints && constraints.video)) {
-                        var err = new DOMException('getDisplayMedia without video ' +
-                            'constraints is undefined');
-                        err.name = 'NotFoundError';
-                        // from https://heycam.github.io/webidl/#idl-DOMException-error-names
-                        err.code = 8;
-                        return Promise.reject(err);
-                    }
-                    if (constraints.video === true) {
-                        constraints.video = {mediaSource: preferredMediaSource};
-                    } else {
-                        constraints.video.mediaSource = preferredMediaSource;
-                    }
-                    return navigator.mediaDevices.getUserMedia(constraints);
-                };
-            }
-        };
-
-    },{"../utils":14,"./getusermedia":12}],12:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-        'use strict';
-
-        var utils = require('../utils');
-        var logging = utils.log;
-
-        // Expose public methods.
-        module.exports = function(window) {
-            var browserDetails = utils.detectBrowser(window);
-            var navigator = window && window.navigator;
-            var MediaStreamTrack = window && window.MediaStreamTrack;
-
-            var shimError_ = function(e) {
-                return {
-                    name: {
-                        InternalError: 'NotReadableError',
-                        NotSupportedError: 'TypeError',
-                        PermissionDeniedError: 'NotAllowedError',
-                        SecurityError: 'NotAllowedError'
-                    }[e.name] || e.name,
-                    message: {
-                        'The operation is insecure.': 'The request is not allowed by the ' +
-                        'user agent or the platform in the current context.'
-                    }[e.message] || e.message,
-                    constraint: e.constraint,
-                    toString: function() {
-                        return this.name + (this.message && ': ') + this.message;
-                    }
-                };
-            };
-
-            // getUserMedia constraints shim.
-            var getUserMedia_ = function(constraints, onSuccess, onError) {
-                var constraintsToFF37_ = function(c) {
-                    if (typeof c !== 'object' || c.require) {
-                        return c;
-                    }
-                    var require = [];
-                    Object.keys(c).forEach(function(key) {
-                        if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
-                            return;
-                        }
-                        var r = c[key] = (typeof c[key] === 'object') ?
-                            c[key] : {ideal: c[key]};
-                        if (r.min !== undefined ||
-                            r.max !== undefined || r.exact !== undefined) {
-                            require.push(key);
-                        }
-                        if (r.exact !== undefined) {
-                            if (typeof r.exact === 'number') {
-                                r. min = r.max = r.exact;
-                            } else {
-                                c[key] = r.exact;
-                            }
-                            delete r.exact;
-                        }
-                        if (r.ideal !== undefined) {
-                            c.advanced = c.advanced || [];
-                            var oc = {};
-                            if (typeof r.ideal === 'number') {
-                                oc[key] = {min: r.ideal, max: r.ideal};
-                            } else {
-                                oc[key] = r.ideal;
-                            }
-                            c.advanced.push(oc);
-                            delete r.ideal;
-                            if (!Object.keys(r).length) {
-                                delete c[key];
-                            }
-                        }
-                    });
-                    if (require.length) {
-                        c.require = require;
-                    }
-                    return c;
-                };
-                constraints = JSON.parse(JSON.stringify(constraints));
-                if (browserDetails.version < 38) {
-                    logging('spec: ' + JSON.stringify(constraints));
-                    if (constraints.audio) {
-                        constraints.audio = constraintsToFF37_(constraints.audio);
-                    }
-                    if (constraints.video) {
-                        constraints.video = constraintsToFF37_(constraints.video);
-                    }
-                    logging('ff37: ' + JSON.stringify(constraints));
-                }
-                return navigator.mozGetUserMedia(constraints, onSuccess, function(e) {
-                    onError(shimError_(e));
-                });
-            };
-
-            // Returns the result of getUserMedia as a Promise.
-            var getUserMediaPromise_ = function(constraints) {
-                return new Promise(function(resolve, reject) {
-                    getUserMedia_(constraints, resolve, reject);
-                });
-            };
-
-            // Shim for mediaDevices on older versions.
-            if (!navigator.mediaDevices) {
-                navigator.mediaDevices = {getUserMedia: getUserMediaPromise_,
-                    addEventListener: function() { },
-                    removeEventListener: function() { }
-                };
-            }
-            navigator.mediaDevices.enumerateDevices =
-                navigator.mediaDevices.enumerateDevices || function() {
-                    return new Promise(function(resolve) {
-                        var infos = [
-                            {kind: 'audioinput', deviceId: 'default', label: '', groupId: ''},
-                            {kind: 'videoinput', deviceId: 'default', label: '', groupId: ''}
-                        ];
-                        resolve(infos);
-                    });
-                };
-
-            if (browserDetails.version < 41) {
-                // Work around http://bugzil.la/1169665
-                var orgEnumerateDevices =
-                    navigator.mediaDevices.enumerateDevices.bind(navigator.mediaDevices);
-                navigator.mediaDevices.enumerateDevices = function() {
-                    return orgEnumerateDevices().then(undefined, function(e) {
-                        if (e.name === 'NotFoundError') {
-                            return [];
-                        }
-                        throw e;
-                    });
-                };
-            }
-            if (browserDetails.version < 49) {
-                var origGetUserMedia = navigator.mediaDevices.getUserMedia.
-                bind(navigator.mediaDevices);
-                navigator.mediaDevices.getUserMedia = function(c) {
-                    return origGetUserMedia(c).then(function(stream) {
-                        // Work around https://bugzil.la/802326
-                        if (c.audio && !stream.getAudioTracks().length ||
-                            c.video && !stream.getVideoTracks().length) {
-                            stream.getTracks().forEach(function(track) {
-                                track.stop();
-                            });
-                            throw new DOMException('The object can not be found here.',
-                                'NotFoundError');
-                        }
-                        return stream;
-                    }, function(e) {
-                        return Promise.reject(shimError_(e));
-                    });
-                };
-            }
-            if (!(browserDetails.version > 55 &&
-                    'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {
-                var remap = function(obj, a, b) {
-                    if (a in obj && !(b in obj)) {
-                        obj[b] = obj[a];
-                        delete obj[a];
-                    }
-                };
-
-                var nativeGetUserMedia = navigator.mediaDevices.getUserMedia.
-                bind(navigator.mediaDevices);
-                navigator.mediaDevices.getUserMedia = function(c) {
-                    if (typeof c === 'object' && typeof c.audio === 'object') {
-                        c = JSON.parse(JSON.stringify(c));
-                        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');
-                        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');
-                    }
-                    return nativeGetUserMedia(c);
-                };
-
-                if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {
-                    var nativeGetSettings = MediaStreamTrack.prototype.getSettings;
-                    MediaStreamTrack.prototype.getSettings = function() {
-                        var obj = nativeGetSettings.apply(this, arguments);
-                        remap(obj, 'mozAutoGainControl', 'autoGainControl');
-                        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');
-                        return obj;
-                    };
-                }
-
-                if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {
-                    var nativeApplyConstraints = MediaStreamTrack.prototype.applyConstraints;
-                    MediaStreamTrack.prototype.applyConstraints = function(c) {
-                        if (this.kind === 'audio' && typeof c === 'object') {
-                            c = JSON.parse(JSON.stringify(c));
-                            remap(c, 'autoGainControl', 'mozAutoGainControl');
-                            remap(c, 'noiseSuppression', 'mozNoiseSuppression');
-                        }
-                        return nativeApplyConstraints.apply(this, [c]);
-                    };
-                }
-            }
-            navigator.getUserMedia = function(constraints, onSuccess, onError) {
-                if (browserDetails.version < 44) {
-                    return getUserMedia_(constraints, onSuccess, onError);
-                }
-                // Replace Firefox 44+'s deprecation warning with unprefixed version.
-                utils.deprecated('navigator.getUserMedia',
-                    'navigator.mediaDevices.getUserMedia');
-                navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);
-            };
-        };
-
-    },{"../utils":14}],13:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        'use strict';
-        var utils = require('../utils');
-
-        module.exports = {
-            shimLocalStreamsAPI: function(window) {
-                if (typeof window !== 'object' || !window.RTCPeerConnection) {
-                    return;
-                }
-                if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {
-                    window.RTCPeerConnection.prototype.getLocalStreams = function() {
-                        if (!this._localStreams) {
-                            this._localStreams = [];
-                        }
-                        return this._localStreams;
-                    };
-                }
-                if (!('getStreamById' in window.RTCPeerConnection.prototype)) {
-                    window.RTCPeerConnection.prototype.getStreamById = function(id) {
-                        var result = null;
-                        if (this._localStreams) {
-                            this._localStreams.forEach(function(stream) {
-                                if (stream.id === id) {
-                                    result = stream;
-                                }
-                            });
-                        }
-                        if (this._remoteStreams) {
-                            this._remoteStreams.forEach(function(stream) {
-                                if (stream.id === id) {
-                                    result = stream;
-                                }
-                            });
-                        }
-                        return result;
-                    };
-                }
-                if (!('addStream' in window.RTCPeerConnection.prototype)) {
-                    var _addTrack = window.RTCPeerConnection.prototype.addTrack;
-                    window.RTCPeerConnection.prototype.addStream = function(stream) {
-                        if (!this._localStreams) {
-                            this._localStreams = [];
-                        }
-                        if (this._localStreams.indexOf(stream) === -1) {
-                            this._localStreams.push(stream);
-                        }
-                        var pc = this;
-                        stream.getTracks().forEach(function(track) {
-                            _addTrack.call(pc, track, stream);
-                        });
-                    };
-
-                    window.RTCPeerConnection.prototype.addTrack = function(track, stream) {
-                        if (stream) {
-                            if (!this._localStreams) {
-                                this._localStreams = [stream];
-                            } else if (this._localStreams.indexOf(stream) === -1) {
-                                this._localStreams.push(stream);
-                            }
-                        }
-                        return _addTrack.call(this, track, stream);
-                    };
-                }
-                if (!('removeStream' in window.RTCPeerConnection.prototype)) {
-                    window.RTCPeerConnection.prototype.removeStream = function(stream) {
-                        if (!this._localStreams) {
-                            this._localStreams = [];
-                        }
-                        var index = this._localStreams.indexOf(stream);
-                        if (index === -1) {
-                            return;
-                        }
-                        this._localStreams.splice(index, 1);
-                        var pc = this;
-                        var tracks = stream.getTracks();
-                        this.getSenders().forEach(function(sender) {
-                            if (tracks.indexOf(sender.track) !== -1) {
-                                pc.removeTrack(sender);
-                            }
-                        });
-                    };
-                }
-            },
-            shimRemoteStreamsAPI: function(window) {
-                if (typeof window !== 'object' || !window.RTCPeerConnection) {
-                    return;
-                }
-                if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {
-                    window.RTCPeerConnection.prototype.getRemoteStreams = function() {
-                        return this._remoteStreams ? this._remoteStreams : [];
-                    };
-                }
-                if (!('onaddstream' in window.RTCPeerConnection.prototype)) {
-                    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {
-                        get: function() {
-                            return this._onaddstream;
-                        },
-                        set: function(f) {
-                            if (this._onaddstream) {
-                                this.removeEventListener('addstream', this._onaddstream);
-                            }
-                            this.addEventListener('addstream', this._onaddstream = f);
-                        }
-                    });
-                    var origSetRemoteDescription =
-                        window.RTCPeerConnection.prototype.setRemoteDescription;
-                    window.RTCPeerConnection.prototype.setRemoteDescription = function() {
-                        var pc = this;
-                        if (!this._onaddstreampoly) {
-                            this.addEventListener('track', this._onaddstreampoly = function(e) {
-                                e.streams.forEach(function(stream) {
-                                    if (!pc._remoteStreams) {
-                                        pc._remoteStreams = [];
-                                    }
-                                    if (pc._remoteStreams.indexOf(stream) >= 0) {
-                                        return;
-                                    }
-                                    pc._remoteStreams.push(stream);
-                                    var event = new Event('addstream');
-                                    event.stream = stream;
-                                    pc.dispatchEvent(event);
-                                });
-                            });
-                        }
-                        return origSetRemoteDescription.apply(pc, arguments);
-                    };
-                }
-            },
-            shimCallbacksAPI: function(window) {
-                if (typeof window !== 'object' || !window.RTCPeerConnection) {
-                    return;
-                }
-                var prototype = window.RTCPeerConnection.prototype;
-                var createOffer = prototype.createOffer;
-                var createAnswer = prototype.createAnswer;
-                var setLocalDescription = prototype.setLocalDescription;
-                var setRemoteDescription = prototype.setRemoteDescription;
-                var addIceCandidate = prototype.addIceCandidate;
-
-                prototype.createOffer = function(successCallback, failureCallback) {
-                    var options = (arguments.length >= 2) ? arguments[2] : arguments[0];
-                    var promise = createOffer.apply(this, [options]);
-                    if (!failureCallback) {
-                        return promise;
-                    }
-                    promise.then(successCallback, failureCallback);
-                    return Promise.resolve();
-                };
-
-                prototype.createAnswer = function(successCallback, failureCallback) {
-                    var options = (arguments.length >= 2) ? arguments[2] : arguments[0];
-                    var promise = createAnswer.apply(this, [options]);
-                    if (!failureCallback) {
-                        return promise;
-                    }
-                    promise.then(successCallback, failureCallback);
-                    return Promise.resolve();
-                };
-
-                var withCallback = function(description, successCallback, failureCallback) {
-                    var promise = setLocalDescription.apply(this, [description]);
-                    if (!failureCallback) {
-                        return promise;
-                    }
-                    promise.then(successCallback, failureCallback);
-                    return Promise.resolve();
-                };
-                prototype.setLocalDescription = withCallback;
-
-                withCallback = function(description, successCallback, failureCallback) {
-                    var promise = setRemoteDescription.apply(this, [description]);
-                    if (!failureCallback) {
-                        return promise;
-                    }
-                    promise.then(successCallback, failureCallback);
-                    return Promise.resolve();
-                };
-                prototype.setRemoteDescription = withCallback;
-
-                withCallback = function(candidate, successCallback, failureCallback) {
-                    var promise = addIceCandidate.apply(this, [candidate]);
-                    if (!failureCallback) {
-                        return promise;
-                    }
-                    promise.then(successCallback, failureCallback);
-                    return Promise.resolve();
-                };
-                prototype.addIceCandidate = withCallback;
-            },
-            shimGetUserMedia: function(window) {
-                var navigator = window && window.navigator;
-
-                if (!navigator.getUserMedia) {
-                    if (navigator.webkitGetUserMedia) {
-                        navigator.getUserMedia = navigator.webkitGetUserMedia.bind(navigator);
-                    } else if (navigator.mediaDevices &&
-                        navigator.mediaDevices.getUserMedia) {
-                        navigator.getUserMedia = function(constraints, cb, errcb) {
-                            navigator.mediaDevices.getUserMedia(constraints)
-                                .then(cb, errcb);
-                        }.bind(navigator);
-                    }
-                }
-            },
-            shimRTCIceServerUrls: function(window) {
-                // migrate from non-spec RTCIceServer.url to RTCIceServer.urls
-                var OrigPeerConnection = window.RTCPeerConnection;
-                window.RTCPeerConnection = function(pcConfig, pcConstraints) {
-                    if (pcConfig && pcConfig.iceServers) {
-                        var newIceServers = [];
-                        for (var i = 0; i < pcConfig.iceServers.length; i++) {
-                            var server = pcConfig.iceServers[i];
-                            if (!server.hasOwnProperty('urls') &&
-                                server.hasOwnProperty('url')) {
-                                utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');
-                                server = JSON.parse(JSON.stringify(server));
-                                server.urls = server.url;
-                                delete server.url;
-                                newIceServers.push(server);
-                            } else {
-                                newIceServers.push(pcConfig.iceServers[i]);
-                            }
-                        }
-                        pcConfig.iceServers = newIceServers;
-                    }
-                    return new OrigPeerConnection(pcConfig, pcConstraints);
-                };
-                window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;
-                // wrap static methods. Currently just generateCertificate.
-                if ('generateCertificate' in window.RTCPeerConnection) {
-                    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
-                        get: function() {
-                            return OrigPeerConnection.generateCertificate;
-                        }
-                    });
-                }
-            },
-            shimTrackEventTransceiver: function(window) {
-                // Add event.transceiver member over deprecated event.receiver
-                if (typeof window === 'object' && window.RTCPeerConnection &&
-                    ('receiver' in window.RTCTrackEvent.prototype) &&
-                    // can't check 'transceiver' in window.RTCTrackEvent.prototype, as it is
-                    // defined for some reason even when window.RTCTransceiver is not.
-                    !window.RTCTransceiver) {
-                    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
-                        get: function() {
-                            return {receiver: this.receiver};
-                        }
-                    });
-                }
-            },
-
-            shimCreateOfferLegacy: function(window) {
-                var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;
-                window.RTCPeerConnection.prototype.createOffer = function(offerOptions) {
-                    var pc = this;
-                    if (offerOptions) {
-                        if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {
-                            // support bit values
-                            offerOptions.offerToReceiveAudio = !!offerOptions.offerToReceiveAudio;
-                        }
-                        var audioTransceiver = pc.getTransceivers().find(function(transceiver) {
-                            return transceiver.sender.track &&
-                                transceiver.sender.track.kind === 'audio';
-                        });
-                        if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {
-                            if (audioTransceiver.direction === 'sendrecv') {
-                                if (audioTransceiver.setDirection) {
-                                    audioTransceiver.setDirection('sendonly');
-                                } else {
-                                    audioTransceiver.direction = 'sendonly';
-                                }
-                            } else if (audioTransceiver.direction === 'recvonly') {
-                                if (audioTransceiver.setDirection) {
-                                    audioTransceiver.setDirection('inactive');
-                                } else {
-                                    audioTransceiver.direction = 'inactive';
-                                }
-                            }
-                        } else if (offerOptions.offerToReceiveAudio === true &&
-                            !audioTransceiver) {
-                            pc.addTransceiver('audio');
-                        }
-
-
-                        if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {
-                            // support bit values
-                            offerOptions.offerToReceiveVideo = !!offerOptions.offerToReceiveVideo;
-                        }
-                        var videoTransceiver = pc.getTransceivers().find(function(transceiver) {
-                            return transceiver.sender.track &&
-                                transceiver.sender.track.kind === 'video';
-                        });
-                        if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {
-                            if (videoTransceiver.direction === 'sendrecv') {
-                                videoTransceiver.setDirection('sendonly');
-                            } else if (videoTransceiver.direction === 'recvonly') {
-                                videoTransceiver.setDirection('inactive');
-                            }
-                        } else if (offerOptions.offerToReceiveVideo === true &&
-                            !videoTransceiver) {
-                            pc.addTransceiver('video');
-                        }
-                    }
-                    return origCreateOffer.apply(pc, arguments);
-                };
-            }
-        };
-
-    },{"../utils":14}],14:[function(require,module,exports){
-        /*
-         *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-         *
-         *  Use of this source code is governed by a BSD-style license
-         *  that can be found in the LICENSE file in the root of the source
-         *  tree.
-         */
-        /* eslint-env node */
-        'use strict';
-
-        var logDisabled_ = true;
-        var deprecationWarnings_ = true;
-
-        /**
-         * Extract browser version out of the provided user agent string.
-         *
-         * @param {!string} uastring userAgent string.
-         * @param {!string} expr Regular expression used as match criteria.
-         * @param {!number} pos position in the version string to be returned.
-         * @return {!number} browser version.
-         */
-        function extractVersion(uastring, expr, pos) {
-            var match = uastring.match(expr);
-            return match && match.length >= pos && parseInt(match[pos], 10);
-        }
-
-        // Wraps the peerconnection event eventNameToWrap in a function
-        // which returns the modified event object (or false to prevent
-        // the event).
-        function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {
-            if (!window.RTCPeerConnection) {
-                return;
-            }
-            var proto = window.RTCPeerConnection.prototype;
-            var nativeAddEventListener = proto.addEventListener;
-            proto.addEventListener = function(nativeEventName, cb) {
-                if (nativeEventName !== eventNameToWrap) {
-                    return nativeAddEventListener.apply(this, arguments);
-                }
-                var wrappedCallback = function(e) {
-                    var modifiedEvent = wrapper(e);
-                    if (modifiedEvent) {
-                        cb(modifiedEvent);
-                    }
-                };
-                this._eventMap = this._eventMap || {};
-                this._eventMap[cb] = wrappedCallback;
-                return nativeAddEventListener.apply(this, [nativeEventName,
-                    wrappedCallback]);
-            };
-
-            var nativeRemoveEventListener = proto.removeEventListener;
-            proto.removeEventListener = function(nativeEventName, cb) {
-                if (nativeEventName !== eventNameToWrap || !this._eventMap
-                    || !this._eventMap[cb]) {
-                    return nativeRemoveEventListener.apply(this, arguments);
-                }
-                var unwrappedCb = this._eventMap[cb];
-                delete this._eventMap[cb];
-                return nativeRemoveEventListener.apply(this, [nativeEventName,
-                    unwrappedCb]);
-            };
-
-            Object.defineProperty(proto, 'on' + eventNameToWrap, {
-                get: function() {
-                    return this['_on' + eventNameToWrap];
-                },
-                set: function(cb) {
-                    if (this['_on' + eventNameToWrap]) {
-                        this.removeEventListener(eventNameToWrap,
-                            this['_on' + eventNameToWrap]);
-                        delete this['_on' + eventNameToWrap];
-                    }
-                    if (cb) {
-                        this.addEventListener(eventNameToWrap,
-                            this['_on' + eventNameToWrap] = cb);
-                    }
-                },
-                enumerable: true,
-                configurable: true
-            });
-        }
-
-        // Utility methods.
-        module.exports = {
-            extractVersion: extractVersion,
-            wrapPeerConnectionEvent: wrapPeerConnectionEvent,
-            disableLog: function(bool) {
-                if (typeof bool !== 'boolean') {
-                    return new Error('Argument type: ' + typeof bool +
-                        '. Please use a boolean.');
-                }
-                logDisabled_ = bool;
-                return (bool) ? 'adapter.js logging disabled' :
-                    'adapter.js logging enabled';
-            },
-
-            /**
-             * Disable or enable deprecation warnings
-             * @param {!boolean} bool set to true to disable warnings.
-             */
-            disableWarnings: function(bool) {
-                if (typeof bool !== 'boolean') {
-                    return new Error('Argument type: ' + typeof bool +
-                        '. Please use a boolean.');
-                }
-                deprecationWarnings_ = !bool;
-                return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');
-            },
-
-            log: function() {
-                if (typeof window === 'object') {
-                    if (logDisabled_) {
-                        return;
-                    }
-                    if (typeof console !== 'undefined' && typeof console.log === 'function') {
-                        console.log.apply(console, arguments);
-                    }
-                }
-            },
-
-            /**
-             * Shows a deprecation warning suggesting the modern and spec-compatible API.
-             */
-            deprecated: function(oldMethod, newMethod) {
-                if (!deprecationWarnings_) {
-                    return;
-                }
-                console.warn(oldMethod + ' is deprecated, please use ' + newMethod +
-                    ' instead.');
-            },
-
-            /**
-             * Browser detector.
-             *
-             * @return {object} result containing browser and version
-             *     properties.
-             */
-            detectBrowser: function(window) {
-                var navigator = window && window.navigator;
-
-                // Returned result object.
-                var result = {};
-                result.browser = null;
-                result.version = null;
-
-                // Fail early if it's not a browser
-                if (typeof window === 'undefined' || !window.navigator) {
-                    result.browser = 'Not a browser.';
-                    return result;
-                }
-
-                if (navigator.mozGetUserMedia) { // Firefox.
-                    result.browser = 'firefox';
-                    result.version = extractVersion(navigator.userAgent,
-                        /Firefox\/(\d+)\./, 1);
-                } else if (navigator.webkitGetUserMedia) {
-                    // Chrome, Chromium, Webview, Opera.
-                    // Version matches Chrome/WebRTC version.
-                    result.browser = 'chrome';
-                    result.version = extractVersion(navigator.userAgent,
-                        /Chrom(e|ium)\/(\d+)\./, 2);
-                } else if (navigator.mediaDevices &&
-                    navigator.userAgent.match(/Edge\/(\d+).(\d+)$/)) { // Edge.
-                    result.browser = 'edge';
-                    result.version = extractVersion(navigator.userAgent,
-                        /Edge\/(\d+).(\d+)$/, 2);
-                } else if (window.RTCPeerConnection &&
-                    navigator.userAgent.match(/AppleWebKit\/(\d+)\./)) { // Safari.
-                    result.browser = 'safari';
-                    result.version = extractVersion(navigator.userAgent,
-                        /AppleWebKit\/(\d+)\./, 1);
-                } else { // Default fallthrough: not supported.
-                    result.browser = 'Not a supported browser.';
-                    return result;
-                }
-
-                return result;
-            }
-        };
-
-    },{}]},{},[3])(3)
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+
+'use strict';
+
+var _adapter_factory = require('./adapter_factory.js');
+
+var adapter = (0, _adapter_factory.adapterFactory)({ window: window });
+module.exports = adapter; // this is the difference from adapter_core.
+
+},{"./adapter_factory.js":2}],2:[function(require,module,exports){
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.adapterFactory = adapterFactory;
+
+var _utils = require('./utils');
+
+var utils = _interopRequireWildcard(_utils);
+
+var _chrome_shim = require('./chrome/chrome_shim');
+
+var chromeShim = _interopRequireWildcard(_chrome_shim);
+
+var _edge_shim = require('./edge/edge_shim');
+
+var edgeShim = _interopRequireWildcard(_edge_shim);
+
+var _firefox_shim = require('./firefox/firefox_shim');
+
+var firefoxShim = _interopRequireWildcard(_firefox_shim);
+
+var _safari_shim = require('./safari/safari_shim');
+
+var safariShim = _interopRequireWildcard(_safari_shim);
+
+var _common_shim = require('./common_shim');
+
+var commonShim = _interopRequireWildcard(_common_shim);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+// Shimming starts here.
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+function adapterFactory() {
+  var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
+      window = _ref.window;
+
+  var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
+    shimChrome: true,
+    shimFirefox: true,
+    shimEdge: true,
+    shimSafari: true
+  };
+
+  // Utils.
+  var logging = utils.log;
+  var browserDetails = utils.detectBrowser(window);
+
+  var adapter = {
+    browserDetails: browserDetails,
+    commonShim: commonShim,
+    extractVersion: utils.extractVersion,
+    disableLog: utils.disableLog,
+    disableWarnings: utils.disableWarnings
+  };
+
+  // Shim browser if found.
+  switch (browserDetails.browser) {
+    case 'chrome':
+      if (!chromeShim || !chromeShim.shimPeerConnection || !options.shimChrome) {
+        logging('Chrome shim is not included in this adapter release.');
+        return adapter;
+      }
+      logging('adapter.js shimming chrome.');
+      // Export to the adapter global object visible in the browser.
+      adapter.browserShim = chromeShim;
+
+      chromeShim.shimGetUserMedia(window);
+      chromeShim.shimMediaStream(window);
+      chromeShim.shimPeerConnection(window);
+      chromeShim.shimOnTrack(window);
+      chromeShim.shimAddTrackRemoveTrack(window);
+      chromeShim.shimGetSendersWithDtmf(window);
+      chromeShim.shimGetStats(window);
+      chromeShim.shimSenderReceiverGetStats(window);
+      chromeShim.fixNegotiationNeeded(window);
+
+      commonShim.shimRTCIceCandidate(window);
+      commonShim.shimConnectionState(window);
+      commonShim.shimMaxMessageSize(window);
+      commonShim.shimSendThrowTypeError(window);
+      commonShim.removeAllowExtmapMixed(window);
+      break;
+    case 'firefox':
+      if (!firefoxShim || !firefoxShim.shimPeerConnection || !options.shimFirefox) {
+        logging('Firefox shim is not included in this adapter release.');
+        return adapter;
+      }
+      logging('adapter.js shimming firefox.');
+      // Export to the adapter global object visible in the browser.
+      adapter.browserShim = firefoxShim;
+
+      firefoxShim.shimGetUserMedia(window);
+      firefoxShim.shimPeerConnection(window);
+      firefoxShim.shimOnTrack(window);
+      firefoxShim.shimRemoveStream(window);
+      firefoxShim.shimSenderGetStats(window);
+      firefoxShim.shimReceiverGetStats(window);
+      firefoxShim.shimRTCDataChannel(window);
+      firefoxShim.shimAddTransceiver(window);
+      firefoxShim.shimCreateOffer(window);
+      firefoxShim.shimCreateAnswer(window);
+
+      commonShim.shimRTCIceCandidate(window);
+      commonShim.shimConnectionState(window);
+      commonShim.shimMaxMessageSize(window);
+      commonShim.shimSendThrowTypeError(window);
+      break;
+    case 'edge':
+      if (!edgeShim || !edgeShim.shimPeerConnection || !options.shimEdge) {
+        logging('MS edge shim is not included in this adapter release.');
+        return adapter;
+      }
+      logging('adapter.js shimming edge.');
+      // Export to the adapter global object visible in the browser.
+      adapter.browserShim = edgeShim;
+
+      edgeShim.shimGetUserMedia(window);
+      edgeShim.shimGetDisplayMedia(window);
+      edgeShim.shimPeerConnection(window);
+      edgeShim.shimReplaceTrack(window);
+
+      // the edge shim implements the full RTCIceCandidate object.
+
+      commonShim.shimMaxMessageSize(window);
+      commonShim.shimSendThrowTypeError(window);
+      break;
+    case 'safari':
+      if (!safariShim || !options.shimSafari) {
+        logging('Safari shim is not included in this adapter release.');
+        return adapter;
+      }
+      logging('adapter.js shimming safari.');
+      // Export to the adapter global object visible in the browser.
+      adapter.browserShim = safariShim;
+
+      safariShim.shimRTCIceServerUrls(window);
+      safariShim.shimCreateOfferLegacy(window);
+      safariShim.shimCallbacksAPI(window);
+      safariShim.shimLocalStreamsAPI(window);
+      safariShim.shimRemoteStreamsAPI(window);
+      safariShim.shimTrackEventTransceiver(window);
+      safariShim.shimGetUserMedia(window);
+
+      commonShim.shimRTCIceCandidate(window);
+      commonShim.shimMaxMessageSize(window);
+      commonShim.shimSendThrowTypeError(window);
+      commonShim.removeAllowExtmapMixed(window);
+      break;
+    default:
+      logging('Unsupported browser!');
+      break;
+  }
+
+  return adapter;
+}
+
+// Browser shims.
+
+},{"./chrome/chrome_shim":3,"./common_shim":6,"./edge/edge_shim":7,"./firefox/firefox_shim":11,"./safari/safari_shim":14,"./utils":15}],3:[function(require,module,exports){
+
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetDisplayMedia = exports.shimGetUserMedia = undefined;
+
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
+var _getusermedia = require('./getusermedia');
+
+Object.defineProperty(exports, 'shimGetUserMedia', {
+  enumerable: true,
+  get: function get() {
+    return _getusermedia.shimGetUserMedia;
+  }
 });
 
+var _getdisplaymedia = require('./getdisplaymedia');
+
+Object.defineProperty(exports, 'shimGetDisplayMedia', {
+  enumerable: true,
+  get: function get() {
+    return _getdisplaymedia.shimGetDisplayMedia;
+  }
+});
+exports.shimMediaStream = shimMediaStream;
+exports.shimOnTrack = shimOnTrack;
+exports.shimGetSendersWithDtmf = shimGetSendersWithDtmf;
+exports.shimGetStats = shimGetStats;
+exports.shimSenderReceiverGetStats = shimSenderReceiverGetStats;
+exports.shimAddTrackRemoveTrackWithNative = shimAddTrackRemoveTrackWithNative;
+exports.shimAddTrackRemoveTrack = shimAddTrackRemoveTrack;
+exports.shimPeerConnection = shimPeerConnection;
+exports.fixNegotiationNeeded = fixNegotiationNeeded;
+
+var _utils = require('../utils.js');
+
+var utils = _interopRequireWildcard(_utils);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+function shimMediaStream(window) {
+  window.MediaStream = window.MediaStream || window.webkitMediaStream;
+}
+
+function shimOnTrack(window) {
+  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && !('ontrack' in window.RTCPeerConnection.prototype)) {
+    Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
+      get: function get() {
+        return this._ontrack;
+      },
+      set: function set(f) {
+        if (this._ontrack) {
+          this.removeEventListener('track', this._ontrack);
+        }
+        this.addEventListener('track', this._ontrack = f);
+      },
+
+      enumerable: true,
+      configurable: true
+    });
+    var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
+    window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
+      var _this = this;
+
+      if (!this._ontrackpoly) {
+        this._ontrackpoly = function (e) {
+          // onaddstream does not fire when a track is added to an existing
+          // stream. But stream.onaddtrack is implemented so we use that.
+          e.stream.addEventListener('addtrack', function (te) {
+            var receiver = void 0;
+            if (window.RTCPeerConnection.prototype.getReceivers) {
+              receiver = _this.getReceivers().find(function (r) {
+                return r.track && r.track.id === te.track.id;
+              });
+            } else {
+              receiver = { track: te.track };
+            }
+
+            var event = new Event('track');
+            event.track = te.track;
+            event.receiver = receiver;
+            event.transceiver = { receiver: receiver };
+            event.streams = [e.stream];
+            _this.dispatchEvent(event);
+          });
+          e.stream.getTracks().forEach(function (track) {
+            var receiver = void 0;
+            if (window.RTCPeerConnection.prototype.getReceivers) {
+              receiver = _this.getReceivers().find(function (r) {
+                return r.track && r.track.id === track.id;
+              });
+            } else {
+              receiver = { track: track };
+            }
+            var event = new Event('track');
+            event.track = track;
+            event.receiver = receiver;
+            event.transceiver = { receiver: receiver };
+            event.streams = [e.stream];
+            _this.dispatchEvent(event);
+          });
+        };
+        this.addEventListener('addstream', this._ontrackpoly);
+      }
+      return origSetRemoteDescription.apply(this, arguments);
+    };
+  } else {
+    // even if RTCRtpTransceiver is in window, it is only used and
+    // emitted in unified-plan. Unfortunately this means we need
+    // to unconditionally wrap the event.
+    utils.wrapPeerConnectionEvent(window, 'track', function (e) {
+      if (!e.transceiver) {
+        Object.defineProperty(e, 'transceiver', { value: { receiver: e.receiver } });
+      }
+      return e;
+    });
+  }
+}
+
+function shimGetSendersWithDtmf(window) {
+  // Overrides addTrack/removeTrack, depends on shimAddTrackRemoveTrack.
+  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && !('getSenders' in window.RTCPeerConnection.prototype) && 'createDTMFSender' in window.RTCPeerConnection.prototype) {
+    var shimSenderWithDtmf = function shimSenderWithDtmf(pc, track) {
+      return {
+        track: track,
+        get dtmf() {
+          if (this._dtmf === undefined) {
+            if (track.kind === 'audio') {
+              this._dtmf = pc.createDTMFSender(track);
+            } else {
+              this._dtmf = null;
+            }
+          }
+          return this._dtmf;
+        },
+        _pc: pc
+      };
+    };
+
+    // augment addTrack when getSenders is not available.
+    if (!window.RTCPeerConnection.prototype.getSenders) {
+      window.RTCPeerConnection.prototype.getSenders = function getSenders() {
+        this._senders = this._senders || [];
+        return this._senders.slice(); // return a copy of the internal state.
+      };
+      var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
+      window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
+        var sender = origAddTrack.apply(this, arguments);
+        if (!sender) {
+          sender = shimSenderWithDtmf(this, track);
+          this._senders.push(sender);
+        }
+        return sender;
+      };
+
+      var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;
+      window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
+        origRemoveTrack.apply(this, arguments);
+        var idx = this._senders.indexOf(sender);
+        if (idx !== -1) {
+          this._senders.splice(idx, 1);
+        }
+      };
+    }
+    var origAddStream = window.RTCPeerConnection.prototype.addStream;
+    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
+      var _this2 = this;
+
+      this._senders = this._senders || [];
+      origAddStream.apply(this, [stream]);
+      stream.getTracks().forEach(function (track) {
+        _this2._senders.push(shimSenderWithDtmf(_this2, track));
+      });
+    };
+
+    var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
+    window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
+      var _this3 = this;
+
+      this._senders = this._senders || [];
+      origRemoveStream.apply(this, [stream]);
+
+      stream.getTracks().forEach(function (track) {
+        var sender = _this3._senders.find(function (s) {
+          return s.track === track;
+        });
+        if (sender) {
+          // remove sender
+          _this3._senders.splice(_this3._senders.indexOf(sender), 1);
+        }
+      });
+    };
+  } else if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && 'getSenders' in window.RTCPeerConnection.prototype && 'createDTMFSender' in window.RTCPeerConnection.prototype && window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {
+    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
+    window.RTCPeerConnection.prototype.getSenders = function getSenders() {
+      var _this4 = this;
+
+      var senders = origGetSenders.apply(this, []);
+      senders.forEach(function (sender) {
+        return sender._pc = _this4;
+      });
+      return senders;
+    };
+
+    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {
+      get: function get() {
+        if (this._dtmf === undefined) {
+          if (this.track.kind === 'audio') {
+            this._dtmf = this._pc.createDTMFSender(this.track);
+          } else {
+            this._dtmf = null;
+          }
+        }
+        return this._dtmf;
+      }
+    });
+  }
+}
+
+function shimGetStats(window) {
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+
+  var origGetStats = window.RTCPeerConnection.prototype.getStats;
+  window.RTCPeerConnection.prototype.getStats = function getStats() {
+    var _this5 = this;
+
+    var _arguments = Array.prototype.slice.call(arguments),
+        selector = _arguments[0],
+        onSucc = _arguments[1],
+        onErr = _arguments[2];
+
+    // If selector is a function then we are in the old style stats so just
+    // pass back the original getStats format to avoid breaking old users.
+
+
+    if (arguments.length > 0 && typeof selector === 'function') {
+      return origGetStats.apply(this, arguments);
+    }
+
+    // When spec-style getStats is supported, return those when called with
+    // either no arguments or the selector argument is null.
+    if (origGetStats.length === 0 && (arguments.length === 0 || typeof selector !== 'function')) {
+      return origGetStats.apply(this, []);
+    }
+
+    var fixChromeStats_ = function fixChromeStats_(response) {
+      var standardReport = {};
+      var reports = response.result();
+      reports.forEach(function (report) {
+        var standardStats = {
+          id: report.id,
+          timestamp: report.timestamp,
+          type: {
+            localcandidate: 'local-candidate',
+            remotecandidate: 'remote-candidate'
+          }[report.type] || report.type
+        };
+        report.names().forEach(function (name) {
+          standardStats[name] = report.stat(name);
+        });
+        standardReport[standardStats.id] = standardStats;
+      });
+
+      return standardReport;
+    };
+
+    // shim getStats with maplike support
+    var makeMapStats = function makeMapStats(stats) {
+      return new Map(Object.keys(stats).map(function (key) {
+        return [key, stats[key]];
+      }));
+    };
+
+    if (arguments.length >= 2) {
+      var successCallbackWrapper_ = function successCallbackWrapper_(response) {
+        onSucc(makeMapStats(fixChromeStats_(response)));
+      };
+
+      return origGetStats.apply(this, [successCallbackWrapper_, selector]);
+    }
+
+    // promise-support
+    return new Promise(function (resolve, reject) {
+      origGetStats.apply(_this5, [function (response) {
+        resolve(makeMapStats(fixChromeStats_(response)));
+      }, reject]);
+    }).then(onSucc, onErr);
+  };
+}
+
+function shimSenderReceiverGetStats(window) {
+  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && window.RTCRtpSender && window.RTCRtpReceiver)) {
+    return;
+  }
+
+  // shim sender stats.
+  if (!('getStats' in window.RTCRtpSender.prototype)) {
+    var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
+    if (origGetSenders) {
+      window.RTCPeerConnection.prototype.getSenders = function getSenders() {
+        var _this6 = this;
+
+        var senders = origGetSenders.apply(this, []);
+        senders.forEach(function (sender) {
+          return sender._pc = _this6;
+        });
+        return senders;
+      };
+    }
+
+    var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
+    if (origAddTrack) {
+      window.RTCPeerConnection.prototype.addTrack = function addTrack() {
+        var sender = origAddTrack.apply(this, arguments);
+        sender._pc = this;
+        return sender;
+      };
+    }
+    window.RTCRtpSender.prototype.getStats = function getStats() {
+      var sender = this;
+      return this._pc.getStats().then(function (result) {
+        return (
+          /* Note: this will include stats of all senders that
+           *   send a track with the same id as sender.track as
+           *   it is not possible to identify the RTCRtpSender.
+           */
+          utils.filterStats(result, sender.track, true)
+        );
+      });
+    };
+  }
+
+  // shim receiver stats.
+  if (!('getStats' in window.RTCRtpReceiver.prototype)) {
+    var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;
+    if (origGetReceivers) {
+      window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {
+        var _this7 = this;
+
+        var receivers = origGetReceivers.apply(this, []);
+        receivers.forEach(function (receiver) {
+          return receiver._pc = _this7;
+        });
+        return receivers;
+      };
+    }
+    utils.wrapPeerConnectionEvent(window, 'track', function (e) {
+      e.receiver._pc = e.srcElement;
+      return e;
+    });
+    window.RTCRtpReceiver.prototype.getStats = function getStats() {
+      var receiver = this;
+      return this._pc.getStats().then(function (result) {
+        return utils.filterStats(result, receiver.track, false);
+      });
+    };
+  }
+
+  if (!('getStats' in window.RTCRtpSender.prototype && 'getStats' in window.RTCRtpReceiver.prototype)) {
+    return;
+  }
+
+  // shim RTCPeerConnection.getStats(track).
+  var origGetStats = window.RTCPeerConnection.prototype.getStats;
+  window.RTCPeerConnection.prototype.getStats = function getStats() {
+    if (arguments.length > 0 && arguments[0] instanceof window.MediaStreamTrack) {
+      var track = arguments[0];
+      var sender = void 0;
+      var receiver = void 0;
+      var err = void 0;
+      this.getSenders().forEach(function (s) {
+        if (s.track === track) {
+          if (sender) {
+            err = true;
+          } else {
+            sender = s;
+          }
+        }
+      });
+      this.getReceivers().forEach(function (r) {
+        if (r.track === track) {
+          if (receiver) {
+            err = true;
+          } else {
+            receiver = r;
+          }
+        }
+        return r.track === track;
+      });
+      if (err || sender && receiver) {
+        return Promise.reject(new DOMException('There are more than one sender or receiver for the track.', 'InvalidAccessError'));
+      } else if (sender) {
+        return sender.getStats();
+      } else if (receiver) {
+        return receiver.getStats();
+      }
+      return Promise.reject(new DOMException('There is no sender or receiver for the track.', 'InvalidAccessError'));
+    }
+    return origGetStats.apply(this, arguments);
+  };
+}
+
+function shimAddTrackRemoveTrackWithNative(window) {
+  // shim addTrack/removeTrack with native variants in order to make
+  // the interactions with legacy getLocalStreams behave as in other browsers.
+  // Keeps a mapping stream.id => [stream, rtpsenders...]
+  window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
+    var _this8 = this;
+
+    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
+    return Object.keys(this._shimmedLocalStreams).map(function (streamId) {
+      return _this8._shimmedLocalStreams[streamId][0];
+    });
+  };
+
+  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
+  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
+    if (!stream) {
+      return origAddTrack.apply(this, arguments);
+    }
+    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
+
+    var sender = origAddTrack.apply(this, arguments);
+    if (!this._shimmedLocalStreams[stream.id]) {
+      this._shimmedLocalStreams[stream.id] = [stream, sender];
+    } else if (this._shimmedLocalStreams[stream.id].indexOf(sender) === -1) {
+      this._shimmedLocalStreams[stream.id].push(sender);
+    }
+    return sender;
+  };
+
+  var origAddStream = window.RTCPeerConnection.prototype.addStream;
+  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
+    var _this9 = this;
+
+    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
+
+    stream.getTracks().forEach(function (track) {
+      var alreadyExists = _this9.getSenders().find(function (s) {
+        return s.track === track;
+      });
+      if (alreadyExists) {
+        throw new DOMException('Track already exists.', 'InvalidAccessError');
+      }
+    });
+    var existingSenders = this.getSenders();
+    origAddStream.apply(this, arguments);
+    var newSenders = this.getSenders().filter(function (newSender) {
+      return existingSenders.indexOf(newSender) === -1;
+    });
+    this._shimmedLocalStreams[stream.id] = [stream].concat(newSenders);
+  };
+
+  var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
+  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
+    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
+    delete this._shimmedLocalStreams[stream.id];
+    return origRemoveStream.apply(this, arguments);
+  };
+
+  var origRemoveTrack = window.RTCPeerConnection.prototype.removeTrack;
+  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
+    var _this10 = this;
+
+    this._shimmedLocalStreams = this._shimmedLocalStreams || {};
+    if (sender) {
+      Object.keys(this._shimmedLocalStreams).forEach(function (streamId) {
+        var idx = _this10._shimmedLocalStreams[streamId].indexOf(sender);
+        if (idx !== -1) {
+          _this10._shimmedLocalStreams[streamId].splice(idx, 1);
+        }
+        if (_this10._shimmedLocalStreams[streamId].length === 1) {
+          delete _this10._shimmedLocalStreams[streamId];
+        }
+      });
+    }
+    return origRemoveTrack.apply(this, arguments);
+  };
+}
+
+function shimAddTrackRemoveTrack(window) {
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+  var browserDetails = utils.detectBrowser(window);
+  // shim addTrack and removeTrack.
+  if (window.RTCPeerConnection.prototype.addTrack && browserDetails.version >= 65) {
+    return shimAddTrackRemoveTrackWithNative(window);
+  }
+
+  // also shim pc.getLocalStreams when addTrack is shimmed
+  // to return the original streams.
+  var origGetLocalStreams = window.RTCPeerConnection.prototype.getLocalStreams;
+  window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
+    var _this11 = this;
+
+    var nativeStreams = origGetLocalStreams.apply(this);
+    this._reverseStreams = this._reverseStreams || {};
+    return nativeStreams.map(function (stream) {
+      return _this11._reverseStreams[stream.id];
+    });
+  };
+
+  var origAddStream = window.RTCPeerConnection.prototype.addStream;
+  window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
+    var _this12 = this;
+
+    this._streams = this._streams || {};
+    this._reverseStreams = this._reverseStreams || {};
+
+    stream.getTracks().forEach(function (track) {
+      var alreadyExists = _this12.getSenders().find(function (s) {
+        return s.track === track;
+      });
+      if (alreadyExists) {
+        throw new DOMException('Track already exists.', 'InvalidAccessError');
+      }
+    });
+    // Add identity mapping for consistency with addTrack.
+    // Unless this is being used with a stream from addTrack.
+    if (!this._reverseStreams[stream.id]) {
+      var newStream = new window.MediaStream(stream.getTracks());
+      this._streams[stream.id] = newStream;
+      this._reverseStreams[newStream.id] = stream;
+      stream = newStream;
+    }
+    origAddStream.apply(this, [stream]);
+  };
+
+  var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;
+  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
+    this._streams = this._streams || {};
+    this._reverseStreams = this._reverseStreams || {};
+
+    origRemoveStream.apply(this, [this._streams[stream.id] || stream]);
+    delete this._reverseStreams[this._streams[stream.id] ? this._streams[stream.id].id : stream.id];
+    delete this._streams[stream.id];
+  };
+
+  window.RTCPeerConnection.prototype.addTrack = function addTrack(track, stream) {
+    var _this13 = this;
+
+    if (this.signalingState === 'closed') {
+      throw new DOMException('The RTCPeerConnection\'s signalingState is \'closed\'.', 'InvalidStateError');
+    }
+    var streams = [].slice.call(arguments, 1);
+    if (streams.length !== 1 || !streams[0].getTracks().find(function (t) {
+      return t === track;
+    })) {
+      // this is not fully correct but all we can manage without
+      // [[associated MediaStreams]] internal slot.
+      throw new DOMException('The adapter.js addTrack polyfill only supports a single ' + ' stream which is associated with the specified track.', 'NotSupportedError');
+    }
+
+    var alreadyExists = this.getSenders().find(function (s) {
+      return s.track === track;
+    });
+    if (alreadyExists) {
+      throw new DOMException('Track already exists.', 'InvalidAccessError');
+    }
+
+    this._streams = this._streams || {};
+    this._reverseStreams = this._reverseStreams || {};
+    var oldStream = this._streams[stream.id];
+    if (oldStream) {
+      // this is using odd Chrome behaviour, use with caution:
+      // https://bugs.chromium.org/p/webrtc/issues/detail?id=7815
+      // Note: we rely on the high-level addTrack/dtmf shim to
+      // create the sender with a dtmf sender.
+      oldStream.addTrack(track);
+
+      // Trigger ONN async.
+      Promise.resolve().then(function () {
+        _this13.dispatchEvent(new Event('negotiationneeded'));
+      });
+    } else {
+      var newStream = new window.MediaStream([track]);
+      this._streams[stream.id] = newStream;
+      this._reverseStreams[newStream.id] = stream;
+      this.addStream(newStream);
+    }
+    return this.getSenders().find(function (s) {
+      return s.track === track;
+    });
+  };
+
+  // replace the internal stream id with the external one and
+  // vice versa.
+  function replaceInternalStreamId(pc, description) {
+    var sdp = description.sdp;
+    Object.keys(pc._reverseStreams || []).forEach(function (internalId) {
+      var externalStream = pc._reverseStreams[internalId];
+      var internalStream = pc._streams[externalStream.id];
+      sdp = sdp.replace(new RegExp(internalStream.id, 'g'), externalStream.id);
+    });
+    return new RTCSessionDescription({
+      type: description.type,
+      sdp: sdp
+    });
+  }
+  function replaceExternalStreamId(pc, description) {
+    var sdp = description.sdp;
+    Object.keys(pc._reverseStreams || []).forEach(function (internalId) {
+      var externalStream = pc._reverseStreams[internalId];
+      var internalStream = pc._streams[externalStream.id];
+      sdp = sdp.replace(new RegExp(externalStream.id, 'g'), internalStream.id);
+    });
+    return new RTCSessionDescription({
+      type: description.type,
+      sdp: sdp
+    });
+  }
+  ['createOffer', 'createAnswer'].forEach(function (method) {
+    var nativeMethod = window.RTCPeerConnection.prototype[method];
+    var methodObj = _defineProperty({}, method, function () {
+      var _this14 = this;
+
+      var args = arguments;
+      var isLegacyCall = arguments.length && typeof arguments[0] === 'function';
+      if (isLegacyCall) {
+        return nativeMethod.apply(this, [function (description) {
+          var desc = replaceInternalStreamId(_this14, description);
+          args[0].apply(null, [desc]);
+        }, function (err) {
+          if (args[1]) {
+            args[1].apply(null, err);
+          }
+        }, arguments[2]]);
+      }
+      return nativeMethod.apply(this, arguments).then(function (description) {
+        return replaceInternalStreamId(_this14, description);
+      });
+    });
+    window.RTCPeerConnection.prototype[method] = methodObj[method];
+  });
+
+  var origSetLocalDescription = window.RTCPeerConnection.prototype.setLocalDescription;
+  window.RTCPeerConnection.prototype.setLocalDescription = function setLocalDescription() {
+    if (!arguments.length || !arguments[0].type) {
+      return origSetLocalDescription.apply(this, arguments);
+    }
+    arguments[0] = replaceExternalStreamId(this, arguments[0]);
+    return origSetLocalDescription.apply(this, arguments);
+  };
+
+  // TODO: mangle getStats: https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamstats-streamidentifier
+
+  var origLocalDescription = Object.getOwnPropertyDescriptor(window.RTCPeerConnection.prototype, 'localDescription');
+  Object.defineProperty(window.RTCPeerConnection.prototype, 'localDescription', {
+    get: function get() {
+      var description = origLocalDescription.get.apply(this);
+      if (description.type === '') {
+        return description;
+      }
+      return replaceInternalStreamId(this, description);
+    }
+  });
+
+  window.RTCPeerConnection.prototype.removeTrack = function removeTrack(sender) {
+    var _this15 = this;
+
+    if (this.signalingState === 'closed') {
+      throw new DOMException('The RTCPeerConnection\'s signalingState is \'closed\'.', 'InvalidStateError');
+    }
+    // We can not yet check for sender instanceof RTCRtpSender
+    // since we shim RTPSender. So we check if sender._pc is set.
+    if (!sender._pc) {
+      throw new DOMException('Argument 1 of RTCPeerConnection.removeTrack ' + 'does not implement interface RTCRtpSender.', 'TypeError');
+    }
+    var isLocal = sender._pc === this;
+    if (!isLocal) {
+      throw new DOMException('Sender was not created by this connection.', 'InvalidAccessError');
+    }
+
+    // Search for the native stream the senders track belongs to.
+    this._streams = this._streams || {};
+    var stream = void 0;
+    Object.keys(this._streams).forEach(function (streamid) {
+      var hasTrack = _this15._streams[streamid].getTracks().find(function (track) {
+        return sender.track === track;
+      });
+      if (hasTrack) {
+        stream = _this15._streams[streamid];
+      }
+    });
+
+    if (stream) {
+      if (stream.getTracks().length === 1) {
+        // if this is the last track of the stream, remove the stream. This
+        // takes care of any shimmed _senders.
+        this.removeStream(this._reverseStreams[stream.id]);
+      } else {
+        // relying on the same odd chrome behaviour as above.
+        stream.removeTrack(sender.track);
+      }
+      this.dispatchEvent(new Event('negotiationneeded'));
+    }
+  };
+}
+
+function shimPeerConnection(window) {
+  var browserDetails = utils.detectBrowser(window);
+
+  if (!window.RTCPeerConnection && window.webkitRTCPeerConnection) {
+    // very basic support for old versions.
+    window.RTCPeerConnection = window.webkitRTCPeerConnection;
+  }
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+
+  // shim implicit creation of RTCSessionDescription/RTCIceCandidate
+  if (browserDetails.version < 53) {
+    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {
+      var nativeMethod = window.RTCPeerConnection.prototype[method];
+      var methodObj = _defineProperty({}, method, function () {
+        arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);
+        return nativeMethod.apply(this, arguments);
+      });
+      window.RTCPeerConnection.prototype[method] = methodObj[method];
+    });
+  }
+
+  // support for addIceCandidate(null or undefined)
+  var nativeAddIceCandidate = window.RTCPeerConnection.prototype.addIceCandidate;
+  window.RTCPeerConnection.prototype.addIceCandidate = function addIceCandidate() {
+    if (!arguments[0]) {
+      if (arguments[1]) {
+        arguments[1].apply(null);
+      }
+      return Promise.resolve();
+    }
+    // Firefox 68+ emits and processes {candidate: "", ...}, ignore
+    // in older versions. Native support planned for Chrome M77.
+    if (browserDetails.version < 78 && arguments[0] && arguments[0].candidate === '') {
+      return Promise.resolve();
+    }
+    return nativeAddIceCandidate.apply(this, arguments);
+  };
+}
+
+function fixNegotiationNeeded(window) {
+  utils.wrapPeerConnectionEvent(window, 'negotiationneeded', function (e) {
+    var pc = e.target;
+    if (pc.signalingState !== 'stable') {
+      return;
+    }
+    return e;
+  });
+}
+
+},{"../utils.js":15,"./getdisplaymedia":4,"./getusermedia":5}],4:[function(require,module,exports){
+/*
+ *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetDisplayMedia = shimGetDisplayMedia;
+function shimGetDisplayMedia(window, getSourceId) {
+  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
+    return;
+  }
+  if (!window.navigator.mediaDevices) {
+    return;
+  }
+  // getSourceId is a function that returns a promise resolving with
+  // the sourceId of the screen/window/tab to be shared.
+  if (typeof getSourceId !== 'function') {
+    console.error('shimGetDisplayMedia: getSourceId argument is not ' + 'a function');
+    return;
+  }
+  window.navigator.mediaDevices.getDisplayMedia = function getDisplayMedia(constraints) {
+    return getSourceId(constraints).then(function (sourceId) {
+      var widthSpecified = constraints.video && constraints.video.width;
+      var heightSpecified = constraints.video && constraints.video.height;
+      var frameRateSpecified = constraints.video && constraints.video.frameRate;
+      constraints.video = {
+        mandatory: {
+          chromeMediaSource: 'desktop',
+          chromeMediaSourceId: sourceId,
+          maxFrameRate: frameRateSpecified || 3
+        }
+      };
+      if (widthSpecified) {
+        constraints.video.mandatory.maxWidth = widthSpecified;
+      }
+      if (heightSpecified) {
+        constraints.video.mandatory.maxHeight = heightSpecified;
+      }
+      return window.navigator.mediaDevices.getUserMedia(constraints);
+    });
+  };
+}
+
+},{}],5:[function(require,module,exports){
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
+exports.shimGetUserMedia = shimGetUserMedia;
+
+var _utils = require('../utils.js');
+
+var utils = _interopRequireWildcard(_utils);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+var logging = utils.log;
+
+function shimGetUserMedia(window) {
+  var navigator = window && window.navigator;
+
+  if (!navigator.mediaDevices) {
+    return;
+  }
+
+  var browserDetails = utils.detectBrowser(window);
+
+  var constraintsToChrome_ = function constraintsToChrome_(c) {
+    if ((typeof c === 'undefined' ? 'undefined' : _typeof(c)) !== 'object' || c.mandatory || c.optional) {
+      return c;
+    }
+    var cc = {};
+    Object.keys(c).forEach(function (key) {
+      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
+        return;
+      }
+      var r = _typeof(c[key]) === 'object' ? c[key] : { ideal: c[key] };
+      if (r.exact !== undefined && typeof r.exact === 'number') {
+        r.min = r.max = r.exact;
+      }
+      var oldname_ = function oldname_(prefix, name) {
+        if (prefix) {
+          return prefix + name.charAt(0).toUpperCase() + name.slice(1);
+        }
+        return name === 'deviceId' ? 'sourceId' : name;
+      };
+      if (r.ideal !== undefined) {
+        cc.optional = cc.optional || [];
+        var oc = {};
+        if (typeof r.ideal === 'number') {
+          oc[oldname_('min', key)] = r.ideal;
+          cc.optional.push(oc);
+          oc = {};
+          oc[oldname_('max', key)] = r.ideal;
+          cc.optional.push(oc);
+        } else {
+          oc[oldname_('', key)] = r.ideal;
+          cc.optional.push(oc);
+        }
+      }
+      if (r.exact !== undefined && typeof r.exact !== 'number') {
+        cc.mandatory = cc.mandatory || {};
+        cc.mandatory[oldname_('', key)] = r.exact;
+      } else {
+        ['min', 'max'].forEach(function (mix) {
+          if (r[mix] !== undefined) {
+            cc.mandatory = cc.mandatory || {};
+            cc.mandatory[oldname_(mix, key)] = r[mix];
+          }
+        });
+      }
+    });
+    if (c.advanced) {
+      cc.optional = (cc.optional || []).concat(c.advanced);
+    }
+    return cc;
+  };
+
+  var shimConstraints_ = function shimConstraints_(constraints, func) {
+    if (browserDetails.version >= 61) {
+      return func(constraints);
+    }
+    constraints = JSON.parse(JSON.stringify(constraints));
+    if (constraints && _typeof(constraints.audio) === 'object') {
+      var remap = function remap(obj, a, b) {
+        if (a in obj && !(b in obj)) {
+          obj[b] = obj[a];
+          delete obj[a];
+        }
+      };
+      constraints = JSON.parse(JSON.stringify(constraints));
+      remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');
+      remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');
+      constraints.audio = constraintsToChrome_(constraints.audio);
+    }
+    if (constraints && _typeof(constraints.video) === 'object') {
+      // Shim facingMode for mobile & surface pro.
+      var face = constraints.video.facingMode;
+      face = face && ((typeof face === 'undefined' ? 'undefined' : _typeof(face)) === 'object' ? face : { ideal: face });
+      var getSupportedFacingModeLies = browserDetails.version < 66;
+
+      if (face && (face.exact === 'user' || face.exact === 'environment' || face.ideal === 'user' || face.ideal === 'environment') && !(navigator.mediaDevices.getSupportedConstraints && navigator.mediaDevices.getSupportedConstraints().facingMode && !getSupportedFacingModeLies)) {
+        delete constraints.video.facingMode;
+        var matches = void 0;
+        if (face.exact === 'environment' || face.ideal === 'environment') {
+          matches = ['back', 'rear'];
+        } else if (face.exact === 'user' || face.ideal === 'user') {
+          matches = ['front'];
+        }
+        if (matches) {
+          // Look for matches in label, or use last cam for back (typical).
+          return navigator.mediaDevices.enumerateDevices().then(function (devices) {
+            devices = devices.filter(function (d) {
+              return d.kind === 'videoinput';
+            });
+            var dev = devices.find(function (d) {
+              return matches.some(function (match) {
+                return d.label.toLowerCase().includes(match);
+              });
+            });
+            if (!dev && devices.length && matches.includes('back')) {
+              dev = devices[devices.length - 1]; // more likely the back cam
+            }
+            if (dev) {
+              constraints.video.deviceId = face.exact ? { exact: dev.deviceId } : { ideal: dev.deviceId };
+            }
+            constraints.video = constraintsToChrome_(constraints.video);
+            logging('chrome: ' + JSON.stringify(constraints));
+            return func(constraints);
+          });
+        }
+      }
+      constraints.video = constraintsToChrome_(constraints.video);
+    }
+    logging('chrome: ' + JSON.stringify(constraints));
+    return func(constraints);
+  };
+
+  var shimError_ = function shimError_(e) {
+    if (browserDetails.version >= 64) {
+      return e;
+    }
+    return {
+      name: {
+        PermissionDeniedError: 'NotAllowedError',
+        PermissionDismissedError: 'NotAllowedError',
+        InvalidStateError: 'NotAllowedError',
+        DevicesNotFoundError: 'NotFoundError',
+        ConstraintNotSatisfiedError: 'OverconstrainedError',
+        TrackStartError: 'NotReadableError',
+        MediaDeviceFailedDueToShutdown: 'NotAllowedError',
+        MediaDeviceKillSwitchOn: 'NotAllowedError',
+        TabCaptureError: 'AbortError',
+        ScreenCaptureError: 'AbortError',
+        DeviceCaptureError: 'AbortError'
+      }[e.name] || e.name,
+      message: e.message,
+      constraint: e.constraint || e.constraintName,
+      toString: function toString() {
+        return this.name + (this.message && ': ') + this.message;
+      }
+    };
+  };
+
+  var getUserMedia_ = function getUserMedia_(constraints, onSuccess, onError) {
+    shimConstraints_(constraints, function (c) {
+      navigator.webkitGetUserMedia(c, onSuccess, function (e) {
+        if (onError) {
+          onError(shimError_(e));
+        }
+      });
+    });
+  };
+  navigator.getUserMedia = getUserMedia_.bind(navigator);
+
+  // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia
+  // function which returns a Promise, it does not accept spec-style
+  // constraints.
+  if (navigator.mediaDevices.getUserMedia) {
+    var origGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
+    navigator.mediaDevices.getUserMedia = function (cs) {
+      return shimConstraints_(cs, function (c) {
+        return origGetUserMedia(c).then(function (stream) {
+          if (c.audio && !stream.getAudioTracks().length || c.video && !stream.getVideoTracks().length) {
+            stream.getTracks().forEach(function (track) {
+              track.stop();
+            });
+            throw new DOMException('', 'NotFoundError');
+          }
+          return stream;
+        }, function (e) {
+          return Promise.reject(shimError_(e));
+        });
+      });
+    };
+  }
+}
+
+},{"../utils.js":15}],6:[function(require,module,exports){
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
+exports.shimRTCIceCandidate = shimRTCIceCandidate;
+exports.shimMaxMessageSize = shimMaxMessageSize;
+exports.shimSendThrowTypeError = shimSendThrowTypeError;
+exports.shimConnectionState = shimConnectionState;
+exports.removeAllowExtmapMixed = removeAllowExtmapMixed;
+
+var _sdp = require('sdp');
+
+var _sdp2 = _interopRequireDefault(_sdp);
+
+var _utils = require('./utils');
+
+var utils = _interopRequireWildcard(_utils);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function shimRTCIceCandidate(window) {
+  // foundation is arbitrarily chosen as an indicator for full support for
+  // https://w3c.github.io/webrtc-pc/#rtcicecandidate-interface
+  if (!window.RTCIceCandidate || window.RTCIceCandidate && 'foundation' in window.RTCIceCandidate.prototype) {
+    return;
+  }
+
+  var NativeRTCIceCandidate = window.RTCIceCandidate;
+  window.RTCIceCandidate = function RTCIceCandidate(args) {
+    // Remove the a= which shouldn't be part of the candidate string.
+    if ((typeof args === 'undefined' ? 'undefined' : _typeof(args)) === 'object' && args.candidate && args.candidate.indexOf('a=') === 0) {
+      args = JSON.parse(JSON.stringify(args));
+      args.candidate = args.candidate.substr(2);
+    }
+
+    if (args.candidate && args.candidate.length) {
+      // Augment the native candidate with the parsed fields.
+      var nativeCandidate = new NativeRTCIceCandidate(args);
+      var parsedCandidate = _sdp2.default.parseCandidate(args.candidate);
+      var augmentedCandidate = Object.assign(nativeCandidate, parsedCandidate);
+
+      // Add a serializer that does not serialize the extra attributes.
+      augmentedCandidate.toJSON = function toJSON() {
+        return {
+          candidate: augmentedCandidate.candidate,
+          sdpMid: augmentedCandidate.sdpMid,
+          sdpMLineIndex: augmentedCandidate.sdpMLineIndex,
+          usernameFragment: augmentedCandidate.usernameFragment
+        };
+      };
+      return augmentedCandidate;
+    }
+    return new NativeRTCIceCandidate(args);
+  };
+  window.RTCIceCandidate.prototype = NativeRTCIceCandidate.prototype;
+
+  // Hook up the augmented candidate in onicecandidate and
+  // addEventListener('icecandidate', ...)
+  utils.wrapPeerConnectionEvent(window, 'icecandidate', function (e) {
+    if (e.candidate) {
+      Object.defineProperty(e, 'candidate', {
+        value: new window.RTCIceCandidate(e.candidate),
+        writable: 'false'
+      });
+    }
+    return e;
+  });
+}
+
+function shimMaxMessageSize(window) {
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+  var browserDetails = utils.detectBrowser(window);
+
+  if (!('sctp' in window.RTCPeerConnection.prototype)) {
+    Object.defineProperty(window.RTCPeerConnection.prototype, 'sctp', {
+      get: function get() {
+        return typeof this._sctp === 'undefined' ? null : this._sctp;
+      }
+    });
+  }
+
+  var sctpInDescription = function sctpInDescription(description) {
+    if (!description || !description.sdp) {
+      return false;
+    }
+    var sections = _sdp2.default.splitSections(description.sdp);
+    sections.shift();
+    return sections.some(function (mediaSection) {
+      var mLine = _sdp2.default.parseMLine(mediaSection);
+      return mLine && mLine.kind === 'application' && mLine.protocol.indexOf('SCTP') !== -1;
+    });
+  };
+
+  var getRemoteFirefoxVersion = function getRemoteFirefoxVersion(description) {
+    // TODO: Is there a better solution for detecting Firefox?
+    var match = description.sdp.match(/mozilla...THIS_IS_SDPARTA-(\d+)/);
+    if (match === null || match.length < 2) {
+      return -1;
+    }
+    var version = parseInt(match[1], 10);
+    // Test for NaN (yes, this is ugly)
+    return version !== version ? -1 : version;
+  };
+
+  var getCanSendMaxMessageSize = function getCanSendMaxMessageSize(remoteIsFirefox) {
+    // Every implementation we know can send at least 64 KiB.
+    // Note: Although Chrome is technically able to send up to 256 KiB, the
+    //       data does not reach the other peer reliably.
+    //       See: https://bugs.chromium.org/p/webrtc/issues/detail?id=8419
+    var canSendMaxMessageSize = 65536;
+    if (browserDetails.browser === 'firefox') {
+      if (browserDetails.version < 57) {
+        if (remoteIsFirefox === -1) {
+          // FF < 57 will send in 16 KiB chunks using the deprecated PPID
+          // fragmentation.
+          canSendMaxMessageSize = 16384;
+        } else {
+          // However, other FF (and RAWRTC) can reassemble PPID-fragmented
+          // messages. Thus, supporting ~2 GiB when sending.
+          canSendMaxMessageSize = 2147483637;
+        }
+      } else if (browserDetails.version < 60) {
+        // Currently, all FF >= 57 will reset the remote maximum message size
+        // to the default value when a data channel is created at a later
+        // stage. :(
+        // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831
+        canSendMaxMessageSize = browserDetails.version === 57 ? 65535 : 65536;
+      } else {
+        // FF >= 60 supports sending ~2 GiB
+        canSendMaxMessageSize = 2147483637;
+      }
+    }
+    return canSendMaxMessageSize;
+  };
+
+  var getMaxMessageSize = function getMaxMessageSize(description, remoteIsFirefox) {
+    // Note: 65536 bytes is the default value from the SDP spec. Also,
+    //       every implementation we know supports receiving 65536 bytes.
+    var maxMessageSize = 65536;
+
+    // FF 57 has a slightly incorrect default remote max message size, so
+    // we need to adjust it here to avoid a failure when sending.
+    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1425697
+    if (browserDetails.browser === 'firefox' && browserDetails.version === 57) {
+      maxMessageSize = 65535;
+    }
+
+    var match = _sdp2.default.matchPrefix(description.sdp, 'a=max-message-size:');
+    if (match.length > 0) {
+      maxMessageSize = parseInt(match[0].substr(19), 10);
+    } else if (browserDetails.browser === 'firefox' && remoteIsFirefox !== -1) {
+      // If the maximum message size is not present in the remote SDP and
+      // both local and remote are Firefox, the remote peer can receive
+      // ~2 GiB.
+      maxMessageSize = 2147483637;
+    }
+    return maxMessageSize;
+  };
+
+  var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
+  window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
+    this._sctp = null;
+    // Chrome decided to not expose .sctp in plan-b mode.
+    // As usual, adapter.js has to do an 'ugly worakaround'
+    // to cover up the mess.
+    if (browserDetails.browser === 'chrome' && browserDetails.version >= 76) {
+      var _getConfiguration = this.getConfiguration(),
+          sdpSemantics = _getConfiguration.sdpSemantics;
+
+      if (sdpSemantics === 'plan-b') {
+        Object.defineProperty(this, 'sctp', {
+          get: function get() {
+            return typeof this._sctp === 'undefined' ? null : this._sctp;
+          },
+
+          enumerable: true,
+          configurable: true
+        });
+      }
+    }
+
+    if (sctpInDescription(arguments[0])) {
+      // Check if the remote is FF.
+      var isFirefox = getRemoteFirefoxVersion(arguments[0]);
+
+      // Get the maximum message size the local peer is capable of sending
+      var canSendMMS = getCanSendMaxMessageSize(isFirefox);
+
+      // Get the maximum message size of the remote peer.
+      var remoteMMS = getMaxMessageSize(arguments[0], isFirefox);
+
+      // Determine final maximum message size
+      var maxMessageSize = void 0;
+      if (canSendMMS === 0 && remoteMMS === 0) {
+        maxMessageSize = Number.POSITIVE_INFINITY;
+      } else if (canSendMMS === 0 || remoteMMS === 0) {
+        maxMessageSize = Math.max(canSendMMS, remoteMMS);
+      } else {
+        maxMessageSize = Math.min(canSendMMS, remoteMMS);
+      }
+
+      // Create a dummy RTCSctpTransport object and the 'maxMessageSize'
+      // attribute.
+      var sctp = {};
+      Object.defineProperty(sctp, 'maxMessageSize', {
+        get: function get() {
+          return maxMessageSize;
+        }
+      });
+      this._sctp = sctp;
+    }
+
+    return origSetRemoteDescription.apply(this, arguments);
+  };
+}
+
+function shimSendThrowTypeError(window) {
+  if (!(window.RTCPeerConnection && 'createDataChannel' in window.RTCPeerConnection.prototype)) {
+    return;
+  }
+
+  // Note: Although Firefox >= 57 has a native implementation, the maximum
+  //       message size can be reset for all data channels at a later stage.
+  //       See: https://bugzilla.mozilla.org/show_bug.cgi?id=1426831
+
+  function wrapDcSend(dc, pc) {
+    var origDataChannelSend = dc.send;
+    dc.send = function send() {
+      var data = arguments[0];
+      var length = data.length || data.size || data.byteLength;
+      if (dc.readyState === 'open' && pc.sctp && length > pc.sctp.maxMessageSize) {
+        throw new TypeError('Message too large (can send a maximum of ' + pc.sctp.maxMessageSize + ' bytes)');
+      }
+      return origDataChannelSend.apply(dc, arguments);
+    };
+  }
+  var origCreateDataChannel = window.RTCPeerConnection.prototype.createDataChannel;
+  window.RTCPeerConnection.prototype.createDataChannel = function createDataChannel() {
+    var dataChannel = origCreateDataChannel.apply(this, arguments);
+    wrapDcSend(dataChannel, this);
+    return dataChannel;
+  };
+  utils.wrapPeerConnectionEvent(window, 'datachannel', function (e) {
+    wrapDcSend(e.channel, e.target);
+    return e;
+  });
+}
+
+/* shims RTCConnectionState by pretending it is the same as iceConnectionState.
+ * See https://bugs.chromium.org/p/webrtc/issues/detail?id=6145#c12
+ * for why this is a valid hack in Chrome. In Firefox it is slightly incorrect
+ * since DTLS failures would be hidden. See
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1265827
+ * for the Firefox tracking bug.
+ */
+function shimConnectionState(window) {
+  if (!window.RTCPeerConnection || 'connectionState' in window.RTCPeerConnection.prototype) {
+    return;
+  }
+  var proto = window.RTCPeerConnection.prototype;
+  Object.defineProperty(proto, 'connectionState', {
+    get: function get() {
+      return {
+        completed: 'connected',
+        checking: 'connecting'
+      }[this.iceConnectionState] || this.iceConnectionState;
+    },
+
+    enumerable: true,
+    configurable: true
+  });
+  Object.defineProperty(proto, 'onconnectionstatechange', {
+    get: function get() {
+      return this._onconnectionstatechange || null;
+    },
+    set: function set(cb) {
+      if (this._onconnectionstatechange) {
+        this.removeEventListener('connectionstatechange', this._onconnectionstatechange);
+        delete this._onconnectionstatechange;
+      }
+      if (cb) {
+        this.addEventListener('connectionstatechange', this._onconnectionstatechange = cb);
+      }
+    },
+
+    enumerable: true,
+    configurable: true
+  });
+
+  ['setLocalDescription', 'setRemoteDescription'].forEach(function (method) {
+    var origMethod = proto[method];
+    proto[method] = function () {
+      if (!this._connectionstatechangepoly) {
+        this._connectionstatechangepoly = function (e) {
+          var pc = e.target;
+          if (pc._lastConnectionState !== pc.connectionState) {
+            pc._lastConnectionState = pc.connectionState;
+            var newEvent = new Event('connectionstatechange', e);
+            pc.dispatchEvent(newEvent);
+          }
+          return e;
+        };
+        this.addEventListener('iceconnectionstatechange', this._connectionstatechangepoly);
+      }
+      return origMethod.apply(this, arguments);
+    };
+  });
+}
+
+function removeAllowExtmapMixed(window) {
+  /* remove a=extmap-allow-mixed for Chrome < M71 */
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+  var browserDetails = utils.detectBrowser(window);
+  if (browserDetails.browser === 'chrome' && browserDetails.version >= 71) {
+    return;
+  }
+  var nativeSRD = window.RTCPeerConnection.prototype.setRemoteDescription;
+  window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription(desc) {
+    if (desc && desc.sdp && desc.sdp.indexOf('\na=extmap-allow-mixed') !== -1) {
+      desc.sdp = desc.sdp.split('\n').filter(function (line) {
+        return line.trim() !== 'a=extmap-allow-mixed';
+      }).join('\n');
+    }
+    return nativeSRD.apply(this, arguments);
+  };
+}
+
+},{"./utils":15,"sdp":17}],7:[function(require,module,exports){
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetDisplayMedia = exports.shimGetUserMedia = undefined;
+
+var _getusermedia = require('./getusermedia');
+
+Object.defineProperty(exports, 'shimGetUserMedia', {
+  enumerable: true,
+  get: function get() {
+    return _getusermedia.shimGetUserMedia;
+  }
+});
+
+var _getdisplaymedia = require('./getdisplaymedia');
+
+Object.defineProperty(exports, 'shimGetDisplayMedia', {
+  enumerable: true,
+  get: function get() {
+    return _getdisplaymedia.shimGetDisplayMedia;
+  }
+});
+exports.shimPeerConnection = shimPeerConnection;
+exports.shimReplaceTrack = shimReplaceTrack;
+
+var _utils = require('../utils');
+
+var utils = _interopRequireWildcard(_utils);
+
+var _filtericeservers = require('./filtericeservers');
+
+var _rtcpeerconnectionShim = require('rtcpeerconnection-shim');
+
+var _rtcpeerconnectionShim2 = _interopRequireDefault(_rtcpeerconnectionShim);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+function shimPeerConnection(window) {
+  var browserDetails = utils.detectBrowser(window);
+
+  if (window.RTCIceGatherer) {
+    if (!window.RTCIceCandidate) {
+      window.RTCIceCandidate = function RTCIceCandidate(args) {
+        return args;
+      };
+    }
+    if (!window.RTCSessionDescription) {
+      window.RTCSessionDescription = function RTCSessionDescription(args) {
+        return args;
+      };
+    }
+    // this adds an additional event listener to MediaStrackTrack that signals
+    // when a tracks enabled property was changed. Workaround for a bug in
+    // addStream, see below. No longer required in 15025+
+    if (browserDetails.version < 15025) {
+      var origMSTEnabled = Object.getOwnPropertyDescriptor(window.MediaStreamTrack.prototype, 'enabled');
+      Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {
+        set: function set(value) {
+          origMSTEnabled.set.call(this, value);
+          var ev = new Event('enabled');
+          ev.enabled = value;
+          this.dispatchEvent(ev);
+        }
+      });
+    }
+  }
+
+  // ORTC defines the DTMF sender a bit different.
+  // https://github.com/w3c/ortc/issues/714
+  if (window.RTCRtpSender && !('dtmf' in window.RTCRtpSender.prototype)) {
+    Object.defineProperty(window.RTCRtpSender.prototype, 'dtmf', {
+      get: function get() {
+        if (this._dtmf === undefined) {
+          if (this.track.kind === 'audio') {
+            this._dtmf = new window.RTCDtmfSender(this);
+          } else if (this.track.kind === 'video') {
+            this._dtmf = null;
+          }
+        }
+        return this._dtmf;
+      }
+    });
+  }
+  // Edge currently only implements the RTCDtmfSender, not the
+  // RTCDTMFSender alias. See http://draft.ortc.org/#rtcdtmfsender2*
+  if (window.RTCDtmfSender && !window.RTCDTMFSender) {
+    window.RTCDTMFSender = window.RTCDtmfSender;
+  }
+
+  var RTCPeerConnectionShim = (0, _rtcpeerconnectionShim2.default)(window, browserDetails.version);
+  window.RTCPeerConnection = function RTCPeerConnection(config) {
+    if (config && config.iceServers) {
+      config.iceServers = (0, _filtericeservers.filterIceServers)(config.iceServers, browserDetails.version);
+      utils.log('ICE servers after filtering:', config.iceServers);
+    }
+    return new RTCPeerConnectionShim(config);
+  };
+  window.RTCPeerConnection.prototype = RTCPeerConnectionShim.prototype;
+}
+
+function shimReplaceTrack(window) {
+  // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614
+  if (window.RTCRtpSender && !('replaceTrack' in window.RTCRtpSender.prototype)) {
+    window.RTCRtpSender.prototype.replaceTrack = window.RTCRtpSender.prototype.setTrack;
+  }
+}
+
+},{"../utils":15,"./filtericeservers":8,"./getdisplaymedia":9,"./getusermedia":10,"rtcpeerconnection-shim":16}],8:[function(require,module,exports){
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.filterIceServers = filterIceServers;
+
+var _utils = require('../utils');
+
+var utils = _interopRequireWildcard(_utils);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+// Edge does not like
+// 1) stun: filtered after 14393 unless ?transport=udp is present
+// 2) turn: that does not have all of turn:host:port?transport=udp
+// 3) turn: with ipv6 addresses
+// 4) turn: occurring muliple times
+function filterIceServers(iceServers, edgeVersion) {
+  var hasTurn = false;
+  iceServers = JSON.parse(JSON.stringify(iceServers));
+  return iceServers.filter(function (server) {
+    if (server && (server.urls || server.url)) {
+      var urls = server.urls || server.url;
+      if (server.url && !server.urls) {
+        utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');
+      }
+      var isString = typeof urls === 'string';
+      if (isString) {
+        urls = [urls];
+      }
+      urls = urls.filter(function (url) {
+        // filter STUN unconditionally.
+        if (url.indexOf('stun:') === 0) {
+          return false;
+        }
+
+        var validTurn = url.startsWith('turn') && !url.startsWith('turn:[') && url.includes('transport=udp');
+        if (validTurn && !hasTurn) {
+          hasTurn = true;
+          return true;
+        }
+        return validTurn && !hasTurn;
+      });
+
+      delete server.url;
+      server.urls = isString ? urls[0] : urls;
+      return !!urls.length;
+    }
+  });
+}
+
+},{"../utils":15}],9:[function(require,module,exports){
+/*
+ *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetDisplayMedia = shimGetDisplayMedia;
+function shimGetDisplayMedia(window) {
+  if (!('getDisplayMedia' in window.navigator)) {
+    return;
+  }
+  if (!window.navigator.mediaDevices) {
+    return;
+  }
+  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
+    return;
+  }
+  window.navigator.mediaDevices.getDisplayMedia = window.navigator.getDisplayMedia.bind(window.navigator);
+}
+
+},{}],10:[function(require,module,exports){
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetUserMedia = shimGetUserMedia;
+function shimGetUserMedia(window) {
+  var navigator = window && window.navigator;
+
+  var shimError_ = function shimError_(e) {
+    return {
+      name: { PermissionDeniedError: 'NotAllowedError' }[e.name] || e.name,
+      message: e.message,
+      constraint: e.constraint,
+      toString: function toString() {
+        return this.name;
+      }
+    };
+  };
+
+  // getUserMedia error shim.
+  var origGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
+  navigator.mediaDevices.getUserMedia = function (c) {
+    return origGetUserMedia(c).catch(function (e) {
+      return Promise.reject(shimError_(e));
+    });
+  };
+}
+
+},{}],11:[function(require,module,exports){
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetDisplayMedia = exports.shimGetUserMedia = undefined;
+
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
+var _getusermedia = require('./getusermedia');
+
+Object.defineProperty(exports, 'shimGetUserMedia', {
+  enumerable: true,
+  get: function get() {
+    return _getusermedia.shimGetUserMedia;
+  }
+});
+
+var _getdisplaymedia = require('./getdisplaymedia');
+
+Object.defineProperty(exports, 'shimGetDisplayMedia', {
+  enumerable: true,
+  get: function get() {
+    return _getdisplaymedia.shimGetDisplayMedia;
+  }
+});
+exports.shimOnTrack = shimOnTrack;
+exports.shimPeerConnection = shimPeerConnection;
+exports.shimSenderGetStats = shimSenderGetStats;
+exports.shimReceiverGetStats = shimReceiverGetStats;
+exports.shimRemoveStream = shimRemoveStream;
+exports.shimRTCDataChannel = shimRTCDataChannel;
+exports.shimAddTransceiver = shimAddTransceiver;
+exports.shimCreateOffer = shimCreateOffer;
+exports.shimCreateAnswer = shimCreateAnswer;
+
+var _utils = require('../utils');
+
+var utils = _interopRequireWildcard(_utils);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+function shimOnTrack(window) {
+  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCTrackEvent && 'receiver' in window.RTCTrackEvent.prototype && !('transceiver' in window.RTCTrackEvent.prototype)) {
+    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
+      get: function get() {
+        return { receiver: this.receiver };
+      }
+    });
+  }
+}
+
+function shimPeerConnection(window) {
+  var browserDetails = utils.detectBrowser(window);
+
+  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !(window.RTCPeerConnection || window.mozRTCPeerConnection)) {
+    return; // probably media.peerconnection.enabled=false in about:config
+  }
+  if (!window.RTCPeerConnection && window.mozRTCPeerConnection) {
+    // very basic support for old versions.
+    window.RTCPeerConnection = window.mozRTCPeerConnection;
+  }
+
+  if (browserDetails.version < 53) {
+    // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.
+    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'].forEach(function (method) {
+      var nativeMethod = window.RTCPeerConnection.prototype[method];
+      var methodObj = _defineProperty({}, method, function () {
+        arguments[0] = new (method === 'addIceCandidate' ? window.RTCIceCandidate : window.RTCSessionDescription)(arguments[0]);
+        return nativeMethod.apply(this, arguments);
+      });
+      window.RTCPeerConnection.prototype[method] = methodObj[method];
+    });
+  }
+
+  // support for addIceCandidate(null or undefined)
+  // as well as ignoring {sdpMid, candidate: ""}
+  if (browserDetails.version < 68) {
+    var nativeAddIceCandidate = window.RTCPeerConnection.prototype.addIceCandidate;
+    window.RTCPeerConnection.prototype.addIceCandidate = function addIceCandidate() {
+      if (!arguments[0]) {
+        if (arguments[1]) {
+          arguments[1].apply(null);
+        }
+        return Promise.resolve();
+      }
+      // Firefox 68+ emits and processes {candidate: "", ...}, ignore
+      // in older versions.
+      if (arguments[0] && arguments[0].candidate === '') {
+        return Promise.resolve();
+      }
+      return nativeAddIceCandidate.apply(this, arguments);
+    };
+  }
+
+  var modernStatsTypes = {
+    inboundrtp: 'inbound-rtp',
+    outboundrtp: 'outbound-rtp',
+    candidatepair: 'candidate-pair',
+    localcandidate: 'local-candidate',
+    remotecandidate: 'remote-candidate'
+  };
+
+  var nativeGetStats = window.RTCPeerConnection.prototype.getStats;
+  window.RTCPeerConnection.prototype.getStats = function getStats() {
+    var _arguments = Array.prototype.slice.call(arguments),
+        selector = _arguments[0],
+        onSucc = _arguments[1],
+        onErr = _arguments[2];
+
+    return nativeGetStats.apply(this, [selector || null]).then(function (stats) {
+      if (browserDetails.version < 53 && !onSucc) {
+        // Shim only promise getStats with spec-hyphens in type names
+        // Leave callback version alone; misc old uses of forEach before Map
+        try {
+          stats.forEach(function (stat) {
+            stat.type = modernStatsTypes[stat.type] || stat.type;
+          });
+        } catch (e) {
+          if (e.name !== 'TypeError') {
+            throw e;
+          }
+          // Avoid TypeError: "type" is read-only, in old versions. 34-43ish
+          stats.forEach(function (stat, i) {
+            stats.set(i, Object.assign({}, stat, {
+              type: modernStatsTypes[stat.type] || stat.type
+            }));
+          });
+        }
+      }
+      return stats;
+    }).then(onSucc, onErr);
+  };
+}
+
+function shimSenderGetStats(window) {
+  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && window.RTCRtpSender)) {
+    return;
+  }
+  if (window.RTCRtpSender && 'getStats' in window.RTCRtpSender.prototype) {
+    return;
+  }
+  var origGetSenders = window.RTCPeerConnection.prototype.getSenders;
+  if (origGetSenders) {
+    window.RTCPeerConnection.prototype.getSenders = function getSenders() {
+      var _this = this;
+
+      var senders = origGetSenders.apply(this, []);
+      senders.forEach(function (sender) {
+        return sender._pc = _this;
+      });
+      return senders;
+    };
+  }
+
+  var origAddTrack = window.RTCPeerConnection.prototype.addTrack;
+  if (origAddTrack) {
+    window.RTCPeerConnection.prototype.addTrack = function addTrack() {
+      var sender = origAddTrack.apply(this, arguments);
+      sender._pc = this;
+      return sender;
+    };
+  }
+  window.RTCRtpSender.prototype.getStats = function getStats() {
+    return this.track ? this._pc.getStats(this.track) : Promise.resolve(new Map());
+  };
+}
+
+function shimReceiverGetStats(window) {
+  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection && window.RTCRtpSender)) {
+    return;
+  }
+  if (window.RTCRtpSender && 'getStats' in window.RTCRtpReceiver.prototype) {
+    return;
+  }
+  var origGetReceivers = window.RTCPeerConnection.prototype.getReceivers;
+  if (origGetReceivers) {
+    window.RTCPeerConnection.prototype.getReceivers = function getReceivers() {
+      var _this2 = this;
+
+      var receivers = origGetReceivers.apply(this, []);
+      receivers.forEach(function (receiver) {
+        return receiver._pc = _this2;
+      });
+      return receivers;
+    };
+  }
+  utils.wrapPeerConnectionEvent(window, 'track', function (e) {
+    e.receiver._pc = e.srcElement;
+    return e;
+  });
+  window.RTCRtpReceiver.prototype.getStats = function getStats() {
+    return this._pc.getStats(this.track);
+  };
+}
+
+function shimRemoveStream(window) {
+  if (!window.RTCPeerConnection || 'removeStream' in window.RTCPeerConnection.prototype) {
+    return;
+  }
+  window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
+    var _this3 = this;
+
+    utils.deprecated('removeStream', 'removeTrack');
+    this.getSenders().forEach(function (sender) {
+      if (sender.track && stream.getTracks().includes(sender.track)) {
+        _this3.removeTrack(sender);
+      }
+    });
+  };
+}
+
+function shimRTCDataChannel(window) {
+  // rename DataChannel to RTCDataChannel (native fix in FF60):
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1173851
+  if (window.DataChannel && !window.RTCDataChannel) {
+    window.RTCDataChannel = window.DataChannel;
+  }
+}
+
+function shimAddTransceiver(window) {
+  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
+  // Firefox ignores the init sendEncodings options passed to addTransceiver
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
+  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection)) {
+    return;
+  }
+  var origAddTransceiver = window.RTCPeerConnection.prototype.addTransceiver;
+  if (origAddTransceiver) {
+    window.RTCPeerConnection.prototype.addTransceiver = function addTransceiver() {
+      this.setParametersPromises = [];
+      var initParameters = arguments[1];
+      var shouldPerformCheck = initParameters && 'sendEncodings' in initParameters;
+      if (shouldPerformCheck) {
+        // If sendEncodings params are provided, validate grammar
+        initParameters.sendEncodings.forEach(function (encodingParam) {
+          if ('rid' in encodingParam) {
+            var ridRegex = /^[a-z0-9]{0,16}$/i;
+            if (!ridRegex.test(encodingParam.rid)) {
+              throw new TypeError('Invalid RID value provided.');
+            }
+          }
+          if ('scaleResolutionDownBy' in encodingParam) {
+            if (!(parseFloat(encodingParam.scaleResolutionDownBy) >= 1.0)) {
+              throw new RangeError('scale_resolution_down_by must be >= 1.0');
+            }
+          }
+          if ('maxFramerate' in encodingParam) {
+            if (!(parseFloat(encodingParam.maxFramerate) >= 0)) {
+              throw new RangeError('max_framerate must be >= 0.0');
+            }
+          }
+        });
+      }
+      var transceiver = origAddTransceiver.apply(this, arguments);
+      if (shouldPerformCheck) {
+        // Check if the init options were applied. If not we do this in an
+        // asynchronous way and save the promise reference in a global object.
+        // This is an ugly hack, but at the same time is way more robust than
+        // checking the sender parameters before and after the createOffer
+        // Also note that after the createoffer we are not 100% sure that
+        // the params were asynchronously applied so we might miss the
+        // opportunity to recreate offer.
+        var sender = transceiver.sender;
+
+        var params = sender.getParameters();
+        if (!('encodings' in params)) {
+          params.encodings = initParameters.sendEncodings;
+          this.setParametersPromises.push(sender.setParameters(params).catch(function () {}));
+        }
+      }
+      return transceiver;
+    };
+  }
+}
+
+function shimCreateOffer(window) {
+  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
+  // Firefox ignores the init sendEncodings options passed to addTransceiver
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
+  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection)) {
+    return;
+  }
+  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;
+  window.RTCPeerConnection.prototype.createOffer = function createOffer() {
+    var _this4 = this,
+        _arguments2 = arguments;
+
+    if (this.setParametersPromises && this.setParametersPromises.length) {
+      return Promise.all(this.setParametersPromises).then(function () {
+        return origCreateOffer.apply(_this4, _arguments2);
+      }).finally(function () {
+        _this4.setParametersPromises = [];
+      });
+    }
+    return origCreateOffer.apply(this, arguments);
+  };
+}
+
+function shimCreateAnswer(window) {
+  // https://github.com/webrtcHacks/adapter/issues/998#issuecomment-516921647
+  // Firefox ignores the init sendEncodings options passed to addTransceiver
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
+  if (!((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCPeerConnection)) {
+    return;
+  }
+  var origCreateAnswer = window.RTCPeerConnection.prototype.createAnswer;
+  window.RTCPeerConnection.prototype.createAnswer = function createAnswer() {
+    var _this5 = this,
+        _arguments3 = arguments;
+
+    if (this.setParametersPromises && this.setParametersPromises.length) {
+      return Promise.all(this.setParametersPromises).then(function () {
+        return origCreateAnswer.apply(_this5, _arguments3);
+      }).finally(function () {
+        _this5.setParametersPromises = [];
+      });
+    }
+    return origCreateAnswer.apply(this, arguments);
+  };
+}
+
+},{"../utils":15,"./getdisplaymedia":12,"./getusermedia":13}],12:[function(require,module,exports){
+/*
+ *  Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.shimGetDisplayMedia = shimGetDisplayMedia;
+function shimGetDisplayMedia(window, preferredMediaSource) {
+  if (window.navigator.mediaDevices && 'getDisplayMedia' in window.navigator.mediaDevices) {
+    return;
+  }
+  if (!window.navigator.mediaDevices) {
+    return;
+  }
+  window.navigator.mediaDevices.getDisplayMedia = function getDisplayMedia(constraints) {
+    if (!(constraints && constraints.video)) {
+      var err = new DOMException('getDisplayMedia without video ' + 'constraints is undefined');
+      err.name = 'NotFoundError';
+      // from https://heycam.github.io/webidl/#idl-DOMException-error-names
+      err.code = 8;
+      return Promise.reject(err);
+    }
+    if (constraints.video === true) {
+      constraints.video = { mediaSource: preferredMediaSource };
+    } else {
+      constraints.video.mediaSource = preferredMediaSource;
+    }
+    return window.navigator.mediaDevices.getUserMedia(constraints);
+  };
+}
+
+},{}],13:[function(require,module,exports){
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
+exports.shimGetUserMedia = shimGetUserMedia;
+
+var _utils = require('../utils');
+
+var utils = _interopRequireWildcard(_utils);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+function shimGetUserMedia(window) {
+  var browserDetails = utils.detectBrowser(window);
+  var navigator = window && window.navigator;
+  var MediaStreamTrack = window && window.MediaStreamTrack;
+
+  navigator.getUserMedia = function (constraints, onSuccess, onError) {
+    // Replace Firefox 44+'s deprecation warning with unprefixed version.
+    utils.deprecated('navigator.getUserMedia', 'navigator.mediaDevices.getUserMedia');
+    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);
+  };
+
+  if (!(browserDetails.version > 55 && 'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {
+    var remap = function remap(obj, a, b) {
+      if (a in obj && !(b in obj)) {
+        obj[b] = obj[a];
+        delete obj[a];
+      }
+    };
+
+    var nativeGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);
+    navigator.mediaDevices.getUserMedia = function (c) {
+      if ((typeof c === 'undefined' ? 'undefined' : _typeof(c)) === 'object' && _typeof(c.audio) === 'object') {
+        c = JSON.parse(JSON.stringify(c));
+        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');
+        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');
+      }
+      return nativeGetUserMedia(c);
+    };
+
+    if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {
+      var nativeGetSettings = MediaStreamTrack.prototype.getSettings;
+      MediaStreamTrack.prototype.getSettings = function () {
+        var obj = nativeGetSettings.apply(this, arguments);
+        remap(obj, 'mozAutoGainControl', 'autoGainControl');
+        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');
+        return obj;
+      };
+    }
+
+    if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {
+      var nativeApplyConstraints = MediaStreamTrack.prototype.applyConstraints;
+      MediaStreamTrack.prototype.applyConstraints = function (c) {
+        if (this.kind === 'audio' && (typeof c === 'undefined' ? 'undefined' : _typeof(c)) === 'object') {
+          c = JSON.parse(JSON.stringify(c));
+          remap(c, 'autoGainControl', 'mozAutoGainControl');
+          remap(c, 'noiseSuppression', 'mozNoiseSuppression');
+        }
+        return nativeApplyConstraints.apply(this, [c]);
+      };
+    }
+  }
+}
+
+},{"../utils":15}],14:[function(require,module,exports){
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
+exports.shimLocalStreamsAPI = shimLocalStreamsAPI;
+exports.shimRemoteStreamsAPI = shimRemoteStreamsAPI;
+exports.shimCallbacksAPI = shimCallbacksAPI;
+exports.shimGetUserMedia = shimGetUserMedia;
+exports.shimConstraints = shimConstraints;
+exports.shimRTCIceServerUrls = shimRTCIceServerUrls;
+exports.shimTrackEventTransceiver = shimTrackEventTransceiver;
+exports.shimCreateOfferLegacy = shimCreateOfferLegacy;
+
+var _utils = require('../utils');
+
+var utils = _interopRequireWildcard(_utils);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+function shimLocalStreamsAPI(window) {
+  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !window.RTCPeerConnection) {
+    return;
+  }
+  if (!('getLocalStreams' in window.RTCPeerConnection.prototype)) {
+    window.RTCPeerConnection.prototype.getLocalStreams = function getLocalStreams() {
+      if (!this._localStreams) {
+        this._localStreams = [];
+      }
+      return this._localStreams;
+    };
+  }
+  if (!('addStream' in window.RTCPeerConnection.prototype)) {
+    var _addTrack = window.RTCPeerConnection.prototype.addTrack;
+    window.RTCPeerConnection.prototype.addStream = function addStream(stream) {
+      var _this = this;
+
+      if (!this._localStreams) {
+        this._localStreams = [];
+      }
+      if (!this._localStreams.includes(stream)) {
+        this._localStreams.push(stream);
+      }
+      // Try to emulate Chrome's behaviour of adding in audio-video order.
+      // Safari orders by track id.
+      stream.getAudioTracks().forEach(function (track) {
+        return _addTrack.call(_this, track, stream);
+      });
+      stream.getVideoTracks().forEach(function (track) {
+        return _addTrack.call(_this, track, stream);
+      });
+    };
+
+    window.RTCPeerConnection.prototype.addTrack = function addTrack(track) {
+      var stream = arguments[1];
+      if (stream) {
+        if (!this._localStreams) {
+          this._localStreams = [stream];
+        } else if (!this._localStreams.includes(stream)) {
+          this._localStreams.push(stream);
+        }
+      }
+      return _addTrack.apply(this, arguments);
+    };
+  }
+  if (!('removeStream' in window.RTCPeerConnection.prototype)) {
+    window.RTCPeerConnection.prototype.removeStream = function removeStream(stream) {
+      var _this2 = this;
+
+      if (!this._localStreams) {
+        this._localStreams = [];
+      }
+      var index = this._localStreams.indexOf(stream);
+      if (index === -1) {
+        return;
+      }
+      this._localStreams.splice(index, 1);
+      var tracks = stream.getTracks();
+      this.getSenders().forEach(function (sender) {
+        if (tracks.includes(sender.track)) {
+          _this2.removeTrack(sender);
+        }
+      });
+    };
+  }
+}
+
+function shimRemoteStreamsAPI(window) {
+  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !window.RTCPeerConnection) {
+    return;
+  }
+  if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {
+    window.RTCPeerConnection.prototype.getRemoteStreams = function getRemoteStreams() {
+      return this._remoteStreams ? this._remoteStreams : [];
+    };
+  }
+  if (!('onaddstream' in window.RTCPeerConnection.prototype)) {
+    Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {
+      get: function get() {
+        return this._onaddstream;
+      },
+      set: function set(f) {
+        var _this3 = this;
+
+        if (this._onaddstream) {
+          this.removeEventListener('addstream', this._onaddstream);
+          this.removeEventListener('track', this._onaddstreampoly);
+        }
+        this.addEventListener('addstream', this._onaddstream = f);
+        this.addEventListener('track', this._onaddstreampoly = function (e) {
+          e.streams.forEach(function (stream) {
+            if (!_this3._remoteStreams) {
+              _this3._remoteStreams = [];
+            }
+            if (_this3._remoteStreams.includes(stream)) {
+              return;
+            }
+            _this3._remoteStreams.push(stream);
+            var event = new Event('addstream');
+            event.stream = stream;
+            _this3.dispatchEvent(event);
+          });
+        });
+      }
+    });
+    var origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
+    window.RTCPeerConnection.prototype.setRemoteDescription = function setRemoteDescription() {
+      var pc = this;
+      if (!this._onaddstreampoly) {
+        this.addEventListener('track', this._onaddstreampoly = function (e) {
+          e.streams.forEach(function (stream) {
+            if (!pc._remoteStreams) {
+              pc._remoteStreams = [];
+            }
+            if (pc._remoteStreams.indexOf(stream) >= 0) {
+              return;
+            }
+            pc._remoteStreams.push(stream);
+            var event = new Event('addstream');
+            event.stream = stream;
+            pc.dispatchEvent(event);
+          });
+        });
+      }
+      return origSetRemoteDescription.apply(pc, arguments);
+    };
+  }
+}
+
+function shimCallbacksAPI(window) {
+  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== 'object' || !window.RTCPeerConnection) {
+    return;
+  }
+  var prototype = window.RTCPeerConnection.prototype;
+  var origCreateOffer = prototype.createOffer;
+  var origCreateAnswer = prototype.createAnswer;
+  var setLocalDescription = prototype.setLocalDescription;
+  var setRemoteDescription = prototype.setRemoteDescription;
+  var addIceCandidate = prototype.addIceCandidate;
+
+  prototype.createOffer = function createOffer(successCallback, failureCallback) {
+    var options = arguments.length >= 2 ? arguments[2] : arguments[0];
+    var promise = origCreateOffer.apply(this, [options]);
+    if (!failureCallback) {
+      return promise;
+    }
+    promise.then(successCallback, failureCallback);
+    return Promise.resolve();
+  };
+
+  prototype.createAnswer = function createAnswer(successCallback, failureCallback) {
+    var options = arguments.length >= 2 ? arguments[2] : arguments[0];
+    var promise = origCreateAnswer.apply(this, [options]);
+    if (!failureCallback) {
+      return promise;
+    }
+    promise.then(successCallback, failureCallback);
+    return Promise.resolve();
+  };
+
+  var withCallback = function withCallback(description, successCallback, failureCallback) {
+    var promise = setLocalDescription.apply(this, [description]);
+    if (!failureCallback) {
+      return promise;
+    }
+    promise.then(successCallback, failureCallback);
+    return Promise.resolve();
+  };
+  prototype.setLocalDescription = withCallback;
+
+  withCallback = function withCallback(description, successCallback, failureCallback) {
+    var promise = setRemoteDescription.apply(this, [description]);
+    if (!failureCallback) {
+      return promise;
+    }
+    promise.then(successCallback, failureCallback);
+    return Promise.resolve();
+  };
+  prototype.setRemoteDescription = withCallback;
+
+  withCallback = function withCallback(candidate, successCallback, failureCallback) {
+    var promise = addIceCandidate.apply(this, [candidate]);
+    if (!failureCallback) {
+      return promise;
+    }
+    promise.then(successCallback, failureCallback);
+    return Promise.resolve();
+  };
+  prototype.addIceCandidate = withCallback;
+}
+
+function shimGetUserMedia(window) {
+  var navigator = window && window.navigator;
+
+  if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
+    // shim not needed in Safari 12.1
+    var mediaDevices = navigator.mediaDevices;
+    var _getUserMedia = mediaDevices.getUserMedia.bind(mediaDevices);
+    navigator.mediaDevices.getUserMedia = function (constraints) {
+      return _getUserMedia(shimConstraints(constraints));
+    };
+  }
+
+  if (!navigator.getUserMedia && navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
+    navigator.getUserMedia = function getUserMedia(constraints, cb, errcb) {
+      navigator.mediaDevices.getUserMedia(constraints).then(cb, errcb);
+    }.bind(navigator);
+  }
+}
+
+function shimConstraints(constraints) {
+  if (constraints && constraints.video !== undefined) {
+    return Object.assign({}, constraints, { video: utils.compactObject(constraints.video) });
+  }
+
+  return constraints;
+}
+
+function shimRTCIceServerUrls(window) {
+  // migrate from non-spec RTCIceServer.url to RTCIceServer.urls
+  var OrigPeerConnection = window.RTCPeerConnection;
+  window.RTCPeerConnection = function RTCPeerConnection(pcConfig, pcConstraints) {
+    if (pcConfig && pcConfig.iceServers) {
+      var newIceServers = [];
+      for (var i = 0; i < pcConfig.iceServers.length; i++) {
+        var server = pcConfig.iceServers[i];
+        if (!server.hasOwnProperty('urls') && server.hasOwnProperty('url')) {
+          utils.deprecated('RTCIceServer.url', 'RTCIceServer.urls');
+          server = JSON.parse(JSON.stringify(server));
+          server.urls = server.url;
+          delete server.url;
+          newIceServers.push(server);
+        } else {
+          newIceServers.push(pcConfig.iceServers[i]);
+        }
+      }
+      pcConfig.iceServers = newIceServers;
+    }
+    return new OrigPeerConnection(pcConfig, pcConstraints);
+  };
+  window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;
+  // wrap static methods. Currently just generateCertificate.
+  if ('generateCertificate' in window.RTCPeerConnection) {
+    Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
+      get: function get() {
+        return OrigPeerConnection.generateCertificate;
+      }
+    });
+  }
+}
+
+function shimTrackEventTransceiver(window) {
+  // Add event.transceiver member over deprecated event.receiver
+  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object' && window.RTCTrackEvent && 'receiver' in window.RTCTrackEvent.prototype && !('transceiver' in window.RTCTrackEvent.prototype)) {
+    Object.defineProperty(window.RTCTrackEvent.prototype, 'transceiver', {
+      get: function get() {
+        return { receiver: this.receiver };
+      }
+    });
+  }
+}
+
+function shimCreateOfferLegacy(window) {
+  var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;
+  window.RTCPeerConnection.prototype.createOffer = function createOffer(offerOptions) {
+    if (offerOptions) {
+      if (typeof offerOptions.offerToReceiveAudio !== 'undefined') {
+        // support bit values
+        offerOptions.offerToReceiveAudio = !!offerOptions.offerToReceiveAudio;
+      }
+      var audioTransceiver = this.getTransceivers().find(function (transceiver) {
+        return transceiver.receiver.track.kind === 'audio';
+      });
+      if (offerOptions.offerToReceiveAudio === false && audioTransceiver) {
+        if (audioTransceiver.direction === 'sendrecv') {
+          if (audioTransceiver.setDirection) {
+            audioTransceiver.setDirection('sendonly');
+          } else {
+            audioTransceiver.direction = 'sendonly';
+          }
+        } else if (audioTransceiver.direction === 'recvonly') {
+          if (audioTransceiver.setDirection) {
+            audioTransceiver.setDirection('inactive');
+          } else {
+            audioTransceiver.direction = 'inactive';
+          }
+        }
+      } else if (offerOptions.offerToReceiveAudio === true && !audioTransceiver) {
+        this.addTransceiver('audio');
+      }
+
+      if (typeof offerOptions.offerToReceiveVideo !== 'undefined') {
+        // support bit values
+        offerOptions.offerToReceiveVideo = !!offerOptions.offerToReceiveVideo;
+      }
+      var videoTransceiver = this.getTransceivers().find(function (transceiver) {
+        return transceiver.receiver.track.kind === 'video';
+      });
+      if (offerOptions.offerToReceiveVideo === false && videoTransceiver) {
+        if (videoTransceiver.direction === 'sendrecv') {
+          if (videoTransceiver.setDirection) {
+            videoTransceiver.setDirection('sendonly');
+          } else {
+            videoTransceiver.direction = 'sendonly';
+          }
+        } else if (videoTransceiver.direction === 'recvonly') {
+          if (videoTransceiver.setDirection) {
+            videoTransceiver.setDirection('inactive');
+          } else {
+            videoTransceiver.direction = 'inactive';
+          }
+        }
+      } else if (offerOptions.offerToReceiveVideo === true && !videoTransceiver) {
+        this.addTransceiver('video');
+      }
+    }
+    return origCreateOffer.apply(this, arguments);
+  };
+}
+
+},{"../utils":15}],15:[function(require,module,exports){
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+/* eslint-env node */
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
+exports.extractVersion = extractVersion;
+exports.wrapPeerConnectionEvent = wrapPeerConnectionEvent;
+exports.disableLog = disableLog;
+exports.disableWarnings = disableWarnings;
+exports.log = log;
+exports.deprecated = deprecated;
+exports.detectBrowser = detectBrowser;
+exports.compactObject = compactObject;
+exports.walkStats = walkStats;
+exports.filterStats = filterStats;
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+var logDisabled_ = true;
+var deprecationWarnings_ = true;
+
+/**
+ * Extract browser version out of the provided user agent string.
+ *
+ * @param {!string} uastring userAgent string.
+ * @param {!string} expr Regular expression used as match criteria.
+ * @param {!number} pos position in the version string to be returned.
+ * @return {!number} browser version.
+ */
+function extractVersion(uastring, expr, pos) {
+  var match = uastring.match(expr);
+  return match && match.length >= pos && parseInt(match[pos], 10);
+}
+
+// Wraps the peerconnection event eventNameToWrap in a function
+// which returns the modified event object (or false to prevent
+// the event).
+function wrapPeerConnectionEvent(window, eventNameToWrap, wrapper) {
+  if (!window.RTCPeerConnection) {
+    return;
+  }
+  var proto = window.RTCPeerConnection.prototype;
+  var nativeAddEventListener = proto.addEventListener;
+  proto.addEventListener = function (nativeEventName, cb) {
+    if (nativeEventName !== eventNameToWrap) {
+      return nativeAddEventListener.apply(this, arguments);
+    }
+    var wrappedCallback = function wrappedCallback(e) {
+      var modifiedEvent = wrapper(e);
+      if (modifiedEvent) {
+        cb(modifiedEvent);
+      }
+    };
+    this._eventMap = this._eventMap || {};
+    this._eventMap[cb] = wrappedCallback;
+    return nativeAddEventListener.apply(this, [nativeEventName, wrappedCallback]);
+  };
+
+  var nativeRemoveEventListener = proto.removeEventListener;
+  proto.removeEventListener = function (nativeEventName, cb) {
+    if (nativeEventName !== eventNameToWrap || !this._eventMap || !this._eventMap[cb]) {
+      return nativeRemoveEventListener.apply(this, arguments);
+    }
+    var unwrappedCb = this._eventMap[cb];
+    delete this._eventMap[cb];
+    return nativeRemoveEventListener.apply(this, [nativeEventName, unwrappedCb]);
+  };
+
+  Object.defineProperty(proto, 'on' + eventNameToWrap, {
+    get: function get() {
+      return this['_on' + eventNameToWrap];
+    },
+    set: function set(cb) {
+      if (this['_on' + eventNameToWrap]) {
+        this.removeEventListener(eventNameToWrap, this['_on' + eventNameToWrap]);
+        delete this['_on' + eventNameToWrap];
+      }
+      if (cb) {
+        this.addEventListener(eventNameToWrap, this['_on' + eventNameToWrap] = cb);
+      }
+    },
+
+    enumerable: true,
+    configurable: true
+  });
+}
+
+function disableLog(bool) {
+  if (typeof bool !== 'boolean') {
+    return new Error('Argument type: ' + (typeof bool === 'undefined' ? 'undefined' : _typeof(bool)) + '. Please use a boolean.');
+  }
+  logDisabled_ = bool;
+  return bool ? 'adapter.js logging disabled' : 'adapter.js logging enabled';
+}
+
+/**
+ * Disable or enable deprecation warnings
+ * @param {!boolean} bool set to true to disable warnings.
+ */
+function disableWarnings(bool) {
+  if (typeof bool !== 'boolean') {
+    return new Error('Argument type: ' + (typeof bool === 'undefined' ? 'undefined' : _typeof(bool)) + '. Please use a boolean.');
+  }
+  deprecationWarnings_ = !bool;
+  return 'adapter.js deprecation warnings ' + (bool ? 'disabled' : 'enabled');
+}
+
+function log() {
+  if ((typeof window === 'undefined' ? 'undefined' : _typeof(window)) === 'object') {
+    if (logDisabled_) {
+      return;
+    }
+    if (typeof console !== 'undefined' && typeof console.log === 'function') {
+      console.log.apply(console, arguments);
+    }
+  }
+}
+
+/**
+ * Shows a deprecation warning suggesting the modern and spec-compatible API.
+ */
+function deprecated(oldMethod, newMethod) {
+  if (!deprecationWarnings_) {
+    return;
+  }
+  console.warn(oldMethod + ' is deprecated, please use ' + newMethod + ' instead.');
+}
+
+/**
+ * Browser detector.
+ *
+ * @return {object} result containing browser and version
+ *     properties.
+ */
+function detectBrowser(window) {
+  var navigator = window.navigator;
+
+  // Returned result object.
+
+  var result = { browser: null, version: null };
+
+  // Fail early if it's not a browser
+  if (typeof window === 'undefined' || !window.navigator) {
+    result.browser = 'Not a browser.';
+    return result;
+  }
+
+  if (navigator.mozGetUserMedia) {
+    // Firefox.
+    result.browser = 'firefox';
+    result.version = extractVersion(navigator.userAgent, /Firefox\/(\d+)\./, 1);
+  } else if (navigator.webkitGetUserMedia || window.isSecureContext === false && window.webkitRTCPeerConnection && !window.RTCIceGatherer) {
+    // Chrome, Chromium, Webview, Opera.
+    // Version matches Chrome/WebRTC version.
+    // Chrome 74 removed webkitGetUserMedia on http as well so we need the
+    // more complicated fallback to webkitRTCPeerConnection.
+    result.browser = 'chrome';
+    result.version = extractVersion(navigator.userAgent, /Chrom(e|ium)\/(\d+)\./, 2);
+  } else if (navigator.mediaDevices && navigator.userAgent.match(/Edge\/(\d+).(\d+)$/)) {
+    // Edge.
+    result.browser = 'edge';
+    result.version = extractVersion(navigator.userAgent, /Edge\/(\d+).(\d+)$/, 2);
+  } else if (window.RTCPeerConnection && navigator.userAgent.match(/AppleWebKit\/(\d+)\./)) {
+    // Safari.
+    result.browser = 'safari';
+    result.version = extractVersion(navigator.userAgent, /AppleWebKit\/(\d+)\./, 1);
+    result.supportsUnifiedPlan = window.RTCRtpTransceiver && 'currentDirection' in window.RTCRtpTransceiver.prototype;
+  } else {
+    // Default fallthrough: not supported.
+    result.browser = 'Not a supported browser.';
+    return result;
+  }
+
+  return result;
+}
+
+/**
+ * Checks if something is an object.
+ *
+ * @param {*} val The something you want to check.
+ * @return true if val is an object, false otherwise.
+ */
+function isObject(val) {
+  return Object.prototype.toString.call(val) === '[object Object]';
+}
+
+/**
+ * Remove all empty objects and undefined values
+ * from a nested object -- an enhanced and vanilla version
+ * of Lodash's `compact`.
+ */
+function compactObject(data) {
+  if (!isObject(data)) {
+    return data;
+  }
+
+  return Object.keys(data).reduce(function (accumulator, key) {
+    var isObj = isObject(data[key]);
+    var value = isObj ? compactObject(data[key]) : data[key];
+    var isEmptyObject = isObj && !Object.keys(value).length;
+    if (value === undefined || isEmptyObject) {
+      return accumulator;
+    }
+    return Object.assign(accumulator, _defineProperty({}, key, value));
+  }, {});
+}
+
+/* iterates the stats graph recursively. */
+function walkStats(stats, base, resultSet) {
+  if (!base || resultSet.has(base.id)) {
+    return;
+  }
+  resultSet.set(base.id, base);
+  Object.keys(base).forEach(function (name) {
+    if (name.endsWith('Id')) {
+      walkStats(stats, stats.get(base[name]), resultSet);
+    } else if (name.endsWith('Ids')) {
+      base[name].forEach(function (id) {
+        walkStats(stats, stats.get(id), resultSet);
+      });
+    }
+  });
+}
+
+/* filter getStats for a sender/receiver track. */
+function filterStats(result, track, outbound) {
+  var streamStatsType = outbound ? 'outbound-rtp' : 'inbound-rtp';
+  var filteredResult = new Map();
+  if (track === null) {
+    return filteredResult;
+  }
+  var trackStats = [];
+  result.forEach(function (value) {
+    if (value.type === 'track' && value.trackIdentifier === track.id) {
+      trackStats.push(value);
+    }
+  });
+  trackStats.forEach(function (trackStat) {
+    result.forEach(function (stats) {
+      if (stats.type === streamStatsType && stats.trackId === trackStat.id) {
+        walkStats(result, stats, filteredResult);
+      }
+    });
+  });
+  return filteredResult;
+}
+
+},{}],16:[function(require,module,exports){
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+ /* eslint-env node */
+'use strict';
+
+var SDPUtils = require('sdp');
+
+function fixStatsType(stat) {
+  return {
+    inboundrtp: 'inbound-rtp',
+    outboundrtp: 'outbound-rtp',
+    candidatepair: 'candidate-pair',
+    localcandidate: 'local-candidate',
+    remotecandidate: 'remote-candidate'
+  }[stat.type] || stat.type;
+}
+
+function writeMediaSection(transceiver, caps, type, stream, dtlsRole) {
+  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);
+
+  // Map ICE parameters (ufrag, pwd) to SDP.
+  sdp += SDPUtils.writeIceParameters(
+      transceiver.iceGatherer.getLocalParameters());
+
+  // Map DTLS parameters to SDP.
+  sdp += SDPUtils.writeDtlsParameters(
+      transceiver.dtlsTransport.getLocalParameters(),
+      type === 'offer' ? 'actpass' : dtlsRole || 'active');
+
+  sdp += 'a=mid:' + transceiver.mid + '\r\n';
+
+  if (transceiver.rtpSender && transceiver.rtpReceiver) {
+    sdp += 'a=sendrecv\r\n';
+  } else if (transceiver.rtpSender) {
+    sdp += 'a=sendonly\r\n';
+  } else if (transceiver.rtpReceiver) {
+    sdp += 'a=recvonly\r\n';
+  } else {
+    sdp += 'a=inactive\r\n';
+  }
+
+  if (transceiver.rtpSender) {
+    var trackId = transceiver.rtpSender._initialTrackId ||
+        transceiver.rtpSender.track.id;
+    transceiver.rtpSender._initialTrackId = trackId;
+    // spec.
+    var msid = 'msid:' + (stream ? stream.id : '-') + ' ' +
+        trackId + '\r\n';
+    sdp += 'a=' + msid;
+    // for Chrome. Legacy should no longer be required.
+    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
+        ' ' + msid;
+
+    // RTX
+    if (transceiver.sendEncodingParameters[0].rtx) {
+      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
+          ' ' + msid;
+      sdp += 'a=ssrc-group:FID ' +
+          transceiver.sendEncodingParameters[0].ssrc + ' ' +
+          transceiver.sendEncodingParameters[0].rtx.ssrc +
+          '\r\n';
+    }
+  }
+  // FIXME: this should be written by writeRtpDescription.
+  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
+      ' cname:' + SDPUtils.localCName + '\r\n';
+  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
+    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
+        ' cname:' + SDPUtils.localCName + '\r\n';
+  }
+  return sdp;
+}
+
+// Edge does not like
+// 1) stun: filtered after 14393 unless ?transport=udp is present
+// 2) turn: that does not have all of turn:host:port?transport=udp
+// 3) turn: with ipv6 addresses
+// 4) turn: occurring muliple times
+function filterIceServers(iceServers, edgeVersion) {
+  var hasTurn = false;
+  iceServers = JSON.parse(JSON.stringify(iceServers));
+  return iceServers.filter(function(server) {
+    if (server && (server.urls || server.url)) {
+      var urls = server.urls || server.url;
+      if (server.url && !server.urls) {
+        console.warn('RTCIceServer.url is deprecated! Use urls instead.');
+      }
+      var isString = typeof urls === 'string';
+      if (isString) {
+        urls = [urls];
+      }
+      urls = urls.filter(function(url) {
+        var validTurn = url.indexOf('turn:') === 0 &&
+            url.indexOf('transport=udp') !== -1 &&
+            url.indexOf('turn:[') === -1 &&
+            !hasTurn;
+
+        if (validTurn) {
+          hasTurn = true;
+          return true;
+        }
+        return url.indexOf('stun:') === 0 && edgeVersion >= 14393 &&
+            url.indexOf('?transport=udp') === -1;
+      });
+
+      delete server.url;
+      server.urls = isString ? urls[0] : urls;
+      return !!urls.length;
+    }
+  });
+}
+
+// Determines the intersection of local and remote capabilities.
+function getCommonCapabilities(localCapabilities, remoteCapabilities) {
+  var commonCapabilities = {
+    codecs: [],
+    headerExtensions: [],
+    fecMechanisms: []
+  };
+
+  var findCodecByPayloadType = function(pt, codecs) {
+    pt = parseInt(pt, 10);
+    for (var i = 0; i < codecs.length; i++) {
+      if (codecs[i].payloadType === pt ||
+          codecs[i].preferredPayloadType === pt) {
+        return codecs[i];
+      }
+    }
+  };
+
+  var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {
+    var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);
+    var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);
+    return lCodec && rCodec &&
+        lCodec.name.toLowerCase() === rCodec.name.toLowerCase();
+  };
+
+  localCapabilities.codecs.forEach(function(lCodec) {
+    for (var i = 0; i < remoteCapabilities.codecs.length; i++) {
+      var rCodec = remoteCapabilities.codecs[i];
+      if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&
+          lCodec.clockRate === rCodec.clockRate) {
+        if (lCodec.name.toLowerCase() === 'rtx' &&
+            lCodec.parameters && rCodec.parameters.apt) {
+          // for RTX we need to find the local rtx that has a apt
+          // which points to the same local codec as the remote one.
+          if (!rtxCapabilityMatches(lCodec, rCodec,
+              localCapabilities.codecs, remoteCapabilities.codecs)) {
+            continue;
+          }
+        }
+        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy
+        // number of channels is the highest common number of channels
+        rCodec.numChannels = Math.min(lCodec.numChannels,
+            rCodec.numChannels);
+        // push rCodec so we reply with offerer payload type
+        commonCapabilities.codecs.push(rCodec);
+
+        // determine common feedback mechanisms
+        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {
+          for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {
+            if (lCodec.rtcpFeedback[j].type === fb.type &&
+                lCodec.rtcpFeedback[j].parameter === fb.parameter) {
+              return true;
+            }
+          }
+          return false;
+        });
+        // FIXME: also need to determine .parameters
+        //  see https://github.com/openpeer/ortc/issues/569
+        break;
+      }
+    }
+  });
+
+  localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {
+    for (var i = 0; i < remoteCapabilities.headerExtensions.length;
+         i++) {
+      var rHeaderExtension = remoteCapabilities.headerExtensions[i];
+      if (lHeaderExtension.uri === rHeaderExtension.uri) {
+        commonCapabilities.headerExtensions.push(rHeaderExtension);
+        break;
+      }
+    }
+  });
+
+  // FIXME: fecMechanisms
+  return commonCapabilities;
+}
+
+// is action=setLocalDescription with type allowed in signalingState
+function isActionAllowedInSignalingState(action, type, signalingState) {
+  return {
+    offer: {
+      setLocalDescription: ['stable', 'have-local-offer'],
+      setRemoteDescription: ['stable', 'have-remote-offer']
+    },
+    answer: {
+      setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],
+      setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']
+    }
+  }[type][action].indexOf(signalingState) !== -1;
+}
+
+function maybeAddCandidate(iceTransport, candidate) {
+  // Edge's internal representation adds some fields therefore
+  // not all fieldѕ are taken into account.
+  var alreadyAdded = iceTransport.getRemoteCandidates()
+      .find(function(remoteCandidate) {
+        return candidate.foundation === remoteCandidate.foundation &&
+            candidate.ip === remoteCandidate.ip &&
+            candidate.port === remoteCandidate.port &&
+            candidate.priority === remoteCandidate.priority &&
+            candidate.protocol === remoteCandidate.protocol &&
+            candidate.type === remoteCandidate.type;
+      });
+  if (!alreadyAdded) {
+    iceTransport.addRemoteCandidate(candidate);
+  }
+  return !alreadyAdded;
+}
+
+
+function makeError(name, description) {
+  var e = new Error(description);
+  e.name = name;
+  // legacy error codes from https://heycam.github.io/webidl/#idl-DOMException-error-names
+  e.code = {
+    NotSupportedError: 9,
+    InvalidStateError: 11,
+    InvalidAccessError: 15,
+    TypeError: undefined,
+    OperationError: undefined
+  }[name];
+  return e;
+}
+
+module.exports = function(window, edgeVersion) {
+  // https://w3c.github.io/mediacapture-main/#mediastream
+  // Helper function to add the track to the stream and
+  // dispatch the event ourselves.
+  function addTrackToStreamAndFireEvent(track, stream) {
+    stream.addTrack(track);
+    stream.dispatchEvent(new window.MediaStreamTrackEvent('addtrack',
+        {track: track}));
+  }
+
+  function removeTrackFromStreamAndFireEvent(track, stream) {
+    stream.removeTrack(track);
+    stream.dispatchEvent(new window.MediaStreamTrackEvent('removetrack',
+        {track: track}));
+  }
+
+  function fireAddTrack(pc, track, receiver, streams) {
+    var trackEvent = new Event('track');
+    trackEvent.track = track;
+    trackEvent.receiver = receiver;
+    trackEvent.transceiver = {receiver: receiver};
+    trackEvent.streams = streams;
+    window.setTimeout(function() {
+      pc._dispatchEvent('track', trackEvent);
+    });
+  }
+
+  var RTCPeerConnection = function(config) {
+    var pc = this;
+
+    var _eventTarget = document.createDocumentFragment();
+    ['addEventListener', 'removeEventListener', 'dispatchEvent']
+        .forEach(function(method) {
+          pc[method] = _eventTarget[method].bind(_eventTarget);
+        });
+
+    this.canTrickleIceCandidates = null;
+
+    this.needNegotiation = false;
+
+    this.localStreams = [];
+    this.remoteStreams = [];
+
+    this._localDescription = null;
+    this._remoteDescription = null;
+
+    this.signalingState = 'stable';
+    this.iceConnectionState = 'new';
+    this.connectionState = 'new';
+    this.iceGatheringState = 'new';
+
+    config = JSON.parse(JSON.stringify(config || {}));
+
+    this.usingBundle = config.bundlePolicy === 'max-bundle';
+    if (config.rtcpMuxPolicy === 'negotiate') {
+      throw(makeError('NotSupportedError',
+          'rtcpMuxPolicy \'negotiate\' is not supported'));
+    } else if (!config.rtcpMuxPolicy) {
+      config.rtcpMuxPolicy = 'require';
+    }
+
+    switch (config.iceTransportPolicy) {
+      case 'all':
+      case 'relay':
+        break;
+      default:
+        config.iceTransportPolicy = 'all';
+        break;
+    }
+
+    switch (config.bundlePolicy) {
+      case 'balanced':
+      case 'max-compat':
+      case 'max-bundle':
+        break;
+      default:
+        config.bundlePolicy = 'balanced';
+        break;
+    }
+
+    config.iceServers = filterIceServers(config.iceServers || [], edgeVersion);
+
+    this._iceGatherers = [];
+    if (config.iceCandidatePoolSize) {
+      for (var i = config.iceCandidatePoolSize; i > 0; i--) {
+        this._iceGatherers.push(new window.RTCIceGatherer({
+          iceServers: config.iceServers,
+          gatherPolicy: config.iceTransportPolicy
+        }));
+      }
+    } else {
+      config.iceCandidatePoolSize = 0;
+    }
+
+    this._config = config;
+
+    // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...
+    // everything that is needed to describe a SDP m-line.
+    this.transceivers = [];
+
+    this._sdpSessionId = SDPUtils.generateSessionId();
+    this._sdpSessionVersion = 0;
+
+    this._dtlsRole = undefined; // role for a=setup to use in answers.
+
+    this._isClosed = false;
+  };
+
+  Object.defineProperty(RTCPeerConnection.prototype, 'localDescription', {
+    configurable: true,
+    get: function() {
+      return this._localDescription;
+    }
+  });
+  Object.defineProperty(RTCPeerConnection.prototype, 'remoteDescription', {
+    configurable: true,
+    get: function() {
+      return this._remoteDescription;
+    }
+  });
+
+  // set up event handlers on prototype
+  RTCPeerConnection.prototype.onicecandidate = null;
+  RTCPeerConnection.prototype.onaddstream = null;
+  RTCPeerConnection.prototype.ontrack = null;
+  RTCPeerConnection.prototype.onremovestream = null;
+  RTCPeerConnection.prototype.onsignalingstatechange = null;
+  RTCPeerConnection.prototype.oniceconnectionstatechange = null;
+  RTCPeerConnection.prototype.onconnectionstatechange = null;
+  RTCPeerConnection.prototype.onicegatheringstatechange = null;
+  RTCPeerConnection.prototype.onnegotiationneeded = null;
+  RTCPeerConnection.prototype.ondatachannel = null;
+
+  RTCPeerConnection.prototype._dispatchEvent = function(name, event) {
+    if (this._isClosed) {
+      return;
+    }
+    this.dispatchEvent(event);
+    if (typeof this['on' + name] === 'function') {
+      this['on' + name](event);
+    }
+  };
+
+  RTCPeerConnection.prototype._emitGatheringStateChange = function() {
+    var event = new Event('icegatheringstatechange');
+    this._dispatchEvent('icegatheringstatechange', event);
+  };
+
+  RTCPeerConnection.prototype.getConfiguration = function() {
+    return this._config;
+  };
+
+  RTCPeerConnection.prototype.getLocalStreams = function() {
+    return this.localStreams;
+  };
+
+  RTCPeerConnection.prototype.getRemoteStreams = function() {
+    return this.remoteStreams;
+  };
+
+  // internal helper to create a transceiver object.
+  // (which is not yet the same as the WebRTC 1.0 transceiver)
+  RTCPeerConnection.prototype._createTransceiver = function(kind, doNotAdd) {
+    var hasBundleTransport = this.transceivers.length > 0;
+    var transceiver = {
+      track: null,
+      iceGatherer: null,
+      iceTransport: null,
+      dtlsTransport: null,
+      localCapabilities: null,
+      remoteCapabilities: null,
+      rtpSender: null,
+      rtpReceiver: null,
+      kind: kind,
+      mid: null,
+      sendEncodingParameters: null,
+      recvEncodingParameters: null,
+      stream: null,
+      associatedRemoteMediaStreams: [],
+      wantReceive: true
+    };
+    if (this.usingBundle && hasBundleTransport) {
+      transceiver.iceTransport = this.transceivers[0].iceTransport;
+      transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;
+    } else {
+      var transports = this._createIceAndDtlsTransports();
+      transceiver.iceTransport = transports.iceTransport;
+      transceiver.dtlsTransport = transports.dtlsTransport;
+    }
+    if (!doNotAdd) {
+      this.transceivers.push(transceiver);
+    }
+    return transceiver;
+  };
+
+  RTCPeerConnection.prototype.addTrack = function(track, stream) {
+    if (this._isClosed) {
+      throw makeError('InvalidStateError',
+          'Attempted to call addTrack on a closed peerconnection.');
+    }
+
+    var alreadyExists = this.transceivers.find(function(s) {
+      return s.track === track;
+    });
+
+    if (alreadyExists) {
+      throw makeError('InvalidAccessError', 'Track already exists.');
+    }
+
+    var transceiver;
+    for (var i = 0; i < this.transceivers.length; i++) {
+      if (!this.transceivers[i].track &&
+          this.transceivers[i].kind === track.kind) {
+        transceiver = this.transceivers[i];
+      }
+    }
+    if (!transceiver) {
+      transceiver = this._createTransceiver(track.kind);
+    }
+
+    this._maybeFireNegotiationNeeded();
+
+    if (this.localStreams.indexOf(stream) === -1) {
+      this.localStreams.push(stream);
+    }
+
+    transceiver.track = track;
+    transceiver.stream = stream;
+    transceiver.rtpSender = new window.RTCRtpSender(track,
+        transceiver.dtlsTransport);
+    return transceiver.rtpSender;
+  };
+
+  RTCPeerConnection.prototype.addStream = function(stream) {
+    var pc = this;
+    if (edgeVersion >= 15025) {
+      stream.getTracks().forEach(function(track) {
+        pc.addTrack(track, stream);
+      });
+    } else {
+      // Clone is necessary for local demos mostly, attaching directly
+      // to two different senders does not work (build 10547).
+      // Fixed in 15025 (or earlier)
+      var clonedStream = stream.clone();
+      stream.getTracks().forEach(function(track, idx) {
+        var clonedTrack = clonedStream.getTracks()[idx];
+        track.addEventListener('enabled', function(event) {
+          clonedTrack.enabled = event.enabled;
+        });
+      });
+      clonedStream.getTracks().forEach(function(track) {
+        pc.addTrack(track, clonedStream);
+      });
+    }
+  };
+
+  RTCPeerConnection.prototype.removeTrack = function(sender) {
+    if (this._isClosed) {
+      throw makeError('InvalidStateError',
+          'Attempted to call removeTrack on a closed peerconnection.');
+    }
+
+    if (!(sender instanceof window.RTCRtpSender)) {
+      throw new TypeError('Argument 1 of RTCPeerConnection.removeTrack ' +
+          'does not implement interface RTCRtpSender.');
+    }
+
+    var transceiver = this.transceivers.find(function(t) {
+      return t.rtpSender === sender;
+    });
+
+    if (!transceiver) {
+      throw makeError('InvalidAccessError',
+          'Sender was not created by this connection.');
+    }
+    var stream = transceiver.stream;
+
+    transceiver.rtpSender.stop();
+    transceiver.rtpSender = null;
+    transceiver.track = null;
+    transceiver.stream = null;
+
+    // remove the stream from the set of local streams
+    var localStreams = this.transceivers.map(function(t) {
+      return t.stream;
+    });
+    if (localStreams.indexOf(stream) === -1 &&
+        this.localStreams.indexOf(stream) > -1) {
+      this.localStreams.splice(this.localStreams.indexOf(stream), 1);
+    }
+
+    this._maybeFireNegotiationNeeded();
+  };
+
+  RTCPeerConnection.prototype.removeStream = function(stream) {
+    var pc = this;
+    stream.getTracks().forEach(function(track) {
+      var sender = pc.getSenders().find(function(s) {
+        return s.track === track;
+      });
+      if (sender) {
+        pc.removeTrack(sender);
+      }
+    });
+  };
+
+  RTCPeerConnection.prototype.getSenders = function() {
+    return this.transceivers.filter(function(transceiver) {
+      return !!transceiver.rtpSender;
+    })
+    .map(function(transceiver) {
+      return transceiver.rtpSender;
+    });
+  };
+
+  RTCPeerConnection.prototype.getReceivers = function() {
+    return this.transceivers.filter(function(transceiver) {
+      return !!transceiver.rtpReceiver;
+    })
+    .map(function(transceiver) {
+      return transceiver.rtpReceiver;
+    });
+  };
+
+
+  RTCPeerConnection.prototype._createIceGatherer = function(sdpMLineIndex,
+      usingBundle) {
+    var pc = this;
+    if (usingBundle && sdpMLineIndex > 0) {
+      return this.transceivers[0].iceGatherer;
+    } else if (this._iceGatherers.length) {
+      return this._iceGatherers.shift();
+    }
+    var iceGatherer = new window.RTCIceGatherer({
+      iceServers: this._config.iceServers,
+      gatherPolicy: this._config.iceTransportPolicy
+    });
+    Object.defineProperty(iceGatherer, 'state',
+        {value: 'new', writable: true}
+    );
+
+    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = [];
+    this.transceivers[sdpMLineIndex].bufferCandidates = function(event) {
+      var end = !event.candidate || Object.keys(event.candidate).length === 0;
+      // polyfill since RTCIceGatherer.state is not implemented in
+      // Edge 10547 yet.
+      iceGatherer.state = end ? 'completed' : 'gathering';
+      if (pc.transceivers[sdpMLineIndex].bufferedCandidateEvents !== null) {
+        pc.transceivers[sdpMLineIndex].bufferedCandidateEvents.push(event);
+      }
+    };
+    iceGatherer.addEventListener('localcandidate',
+      this.transceivers[sdpMLineIndex].bufferCandidates);
+    return iceGatherer;
+  };
+
+  // start gathering from an RTCIceGatherer.
+  RTCPeerConnection.prototype._gather = function(mid, sdpMLineIndex) {
+    var pc = this;
+    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
+    if (iceGatherer.onlocalcandidate) {
+      return;
+    }
+    var bufferedCandidateEvents =
+      this.transceivers[sdpMLineIndex].bufferedCandidateEvents;
+    this.transceivers[sdpMLineIndex].bufferedCandidateEvents = null;
+    iceGatherer.removeEventListener('localcandidate',
+      this.transceivers[sdpMLineIndex].bufferCandidates);
+    iceGatherer.onlocalcandidate = function(evt) {
+      if (pc.usingBundle && sdpMLineIndex > 0) {
+        // if we know that we use bundle we can drop candidates with
+        // ѕdpMLineIndex > 0. If we don't do this then our state gets
+        // confused since we dispose the extra ice gatherer.
+        return;
+      }
+      var event = new Event('icecandidate');
+      event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};
+
+      var cand = evt.candidate;
+      // Edge emits an empty object for RTCIceCandidateComplete‥
+      var end = !cand || Object.keys(cand).length === 0;
+      if (end) {
+        // polyfill since RTCIceGatherer.state is not implemented in
+        // Edge 10547 yet.
+        if (iceGatherer.state === 'new' || iceGatherer.state === 'gathering') {
+          iceGatherer.state = 'completed';
+        }
+      } else {
+        if (iceGatherer.state === 'new') {
+          iceGatherer.state = 'gathering';
+        }
+        // RTCIceCandidate doesn't have a component, needs to be added
+        cand.component = 1;
+        // also the usernameFragment. TODO: update SDP to take both variants.
+        cand.ufrag = iceGatherer.getLocalParameters().usernameFragment;
+
+        var serializedCandidate = SDPUtils.writeCandidate(cand);
+        event.candidate = Object.assign(event.candidate,
+            SDPUtils.parseCandidate(serializedCandidate));
+
+        event.candidate.candidate = serializedCandidate;
+        event.candidate.toJSON = function() {
+          return {
+            candidate: event.candidate.candidate,
+            sdpMid: event.candidate.sdpMid,
+            sdpMLineIndex: event.candidate.sdpMLineIndex,
+            usernameFragment: event.candidate.usernameFragment
+          };
+        };
+      }
+
+      // update local description.
+      var sections = SDPUtils.getMediaSections(pc._localDescription.sdp);
+      if (!end) {
+        sections[event.candidate.sdpMLineIndex] +=
+            'a=' + event.candidate.candidate + '\r\n';
+      } else {
+        sections[event.candidate.sdpMLineIndex] +=
+            'a=end-of-candidates\r\n';
+      }
+      pc._localDescription.sdp =
+          SDPUtils.getDescription(pc._localDescription.sdp) +
+          sections.join('');
+      var complete = pc.transceivers.every(function(transceiver) {
+        return transceiver.iceGatherer &&
+            transceiver.iceGatherer.state === 'completed';
+      });
+
+      if (pc.iceGatheringState !== 'gathering') {
+        pc.iceGatheringState = 'gathering';
+        pc._emitGatheringStateChange();
+      }
+
+      // Emit candidate. Also emit null candidate when all gatherers are
+      // complete.
+      if (!end) {
+        pc._dispatchEvent('icecandidate', event);
+      }
+      if (complete) {
+        pc._dispatchEvent('icecandidate', new Event('icecandidate'));
+        pc.iceGatheringState = 'complete';
+        pc._emitGatheringStateChange();
+      }
+    };
+
+    // emit already gathered candidates.
+    window.setTimeout(function() {
+      bufferedCandidateEvents.forEach(function(e) {
+        iceGatherer.onlocalcandidate(e);
+      });
+    }, 0);
+  };
+
+  // Create ICE transport and DTLS transport.
+  RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {
+    var pc = this;
+    var iceTransport = new window.RTCIceTransport(null);
+    iceTransport.onicestatechange = function() {
+      pc._updateIceConnectionState();
+      pc._updateConnectionState();
+    };
+
+    var dtlsTransport = new window.RTCDtlsTransport(iceTransport);
+    dtlsTransport.ondtlsstatechange = function() {
+      pc._updateConnectionState();
+    };
+    dtlsTransport.onerror = function() {
+      // onerror does not set state to failed by itself.
+      Object.defineProperty(dtlsTransport, 'state',
+          {value: 'failed', writable: true});
+      pc._updateConnectionState();
+    };
+
+    return {
+      iceTransport: iceTransport,
+      dtlsTransport: dtlsTransport
+    };
+  };
+
+  // Destroy ICE gatherer, ICE transport and DTLS transport.
+  // Without triggering the callbacks.
+  RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(
+      sdpMLineIndex) {
+    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
+    if (iceGatherer) {
+      delete iceGatherer.onlocalcandidate;
+      delete this.transceivers[sdpMLineIndex].iceGatherer;
+    }
+    var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;
+    if (iceTransport) {
+      delete iceTransport.onicestatechange;
+      delete this.transceivers[sdpMLineIndex].iceTransport;
+    }
+    var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;
+    if (dtlsTransport) {
+      delete dtlsTransport.ondtlsstatechange;
+      delete dtlsTransport.onerror;
+      delete this.transceivers[sdpMLineIndex].dtlsTransport;
+    }
+  };
+
+  // Start the RTP Sender and Receiver for a transceiver.
+  RTCPeerConnection.prototype._transceive = function(transceiver,
+      send, recv) {
+    var params = getCommonCapabilities(transceiver.localCapabilities,
+        transceiver.remoteCapabilities);
+    if (send && transceiver.rtpSender) {
+      params.encodings = transceiver.sendEncodingParameters;
+      params.rtcp = {
+        cname: SDPUtils.localCName,
+        compound: transceiver.rtcpParameters.compound
+      };
+      if (transceiver.recvEncodingParameters.length) {
+        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;
+      }
+      transceiver.rtpSender.send(params);
+    }
+    if (recv && transceiver.rtpReceiver && params.codecs.length > 0) {
+      // remove RTX field in Edge 14942
+      if (transceiver.kind === 'video'
+          && transceiver.recvEncodingParameters
+          && edgeVersion < 15019) {
+        transceiver.recvEncodingParameters.forEach(function(p) {
+          delete p.rtx;
+        });
+      }
+      if (transceiver.recvEncodingParameters.length) {
+        params.encodings = transceiver.recvEncodingParameters;
+      } else {
+        params.encodings = [{}];
+      }
+      params.rtcp = {
+        compound: transceiver.rtcpParameters.compound
+      };
+      if (transceiver.rtcpParameters.cname) {
+        params.rtcp.cname = transceiver.rtcpParameters.cname;
+      }
+      if (transceiver.sendEncodingParameters.length) {
+        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;
+      }
+      transceiver.rtpReceiver.receive(params);
+    }
+  };
+
+  RTCPeerConnection.prototype.setLocalDescription = function(description) {
+    var pc = this;
+
+    // Note: pranswer is not supported.
+    if (['offer', 'answer'].indexOf(description.type) === -1) {
+      return Promise.reject(makeError('TypeError',
+          'Unsupported type "' + description.type + '"'));
+    }
+
+    if (!isActionAllowedInSignalingState('setLocalDescription',
+        description.type, pc.signalingState) || pc._isClosed) {
+      return Promise.reject(makeError('InvalidStateError',
+          'Can not set local ' + description.type +
+          ' in state ' + pc.signalingState));
+    }
+
+    var sections;
+    var sessionpart;
+    if (description.type === 'offer') {
+      // VERY limited support for SDP munging. Limited to:
+      // * changing the order of codecs
+      sections = SDPUtils.splitSections(description.sdp);
+      sessionpart = sections.shift();
+      sections.forEach(function(mediaSection, sdpMLineIndex) {
+        var caps = SDPUtils.parseRtpParameters(mediaSection);
+        pc.transceivers[sdpMLineIndex].localCapabilities = caps;
+      });
+
+      pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
+        pc._gather(transceiver.mid, sdpMLineIndex);
+      });
+    } else if (description.type === 'answer') {
+      sections = SDPUtils.splitSections(pc._remoteDescription.sdp);
+      sessionpart = sections.shift();
+      var isIceLite = SDPUtils.matchPrefix(sessionpart,
+          'a=ice-lite').length > 0;
+      sections.forEach(function(mediaSection, sdpMLineIndex) {
+        var transceiver = pc.transceivers[sdpMLineIndex];
+        var iceGatherer = transceiver.iceGatherer;
+        var iceTransport = transceiver.iceTransport;
+        var dtlsTransport = transceiver.dtlsTransport;
+        var localCapabilities = transceiver.localCapabilities;
+        var remoteCapabilities = transceiver.remoteCapabilities;
+
+        // treat bundle-only as not-rejected.
+        var rejected = SDPUtils.isRejected(mediaSection) &&
+            SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;
+
+        if (!rejected && !transceiver.rejected) {
+          var remoteIceParameters = SDPUtils.getIceParameters(
+              mediaSection, sessionpart);
+          var remoteDtlsParameters = SDPUtils.getDtlsParameters(
+              mediaSection, sessionpart);
+          if (isIceLite) {
+            remoteDtlsParameters.role = 'server';
+          }
+
+          if (!pc.usingBundle || sdpMLineIndex === 0) {
+            pc._gather(transceiver.mid, sdpMLineIndex);
+            if (iceTransport.state === 'new') {
+              iceTransport.start(iceGatherer, remoteIceParameters,
+                  isIceLite ? 'controlling' : 'controlled');
+            }
+            if (dtlsTransport.state === 'new') {
+              dtlsTransport.start(remoteDtlsParameters);
+            }
+          }
+
+          // Calculate intersection of capabilities.
+          var params = getCommonCapabilities(localCapabilities,
+              remoteCapabilities);
+
+          // Start the RTCRtpSender. The RTCRtpReceiver for this
+          // transceiver has already been started in setRemoteDescription.
+          pc._transceive(transceiver,
+              params.codecs.length > 0,
+              false);
+        }
+      });
+    }
+
+    pc._localDescription = {
+      type: description.type,
+      sdp: description.sdp
+    };
+    if (description.type === 'offer') {
+      pc._updateSignalingState('have-local-offer');
+    } else {
+      pc._updateSignalingState('stable');
+    }
+
+    return Promise.resolve();
+  };
+
+  RTCPeerConnection.prototype.setRemoteDescription = function(description) {
+    var pc = this;
+
+    // Note: pranswer is not supported.
+    if (['offer', 'answer'].indexOf(description.type) === -1) {
+      return Promise.reject(makeError('TypeError',
+          'Unsupported type "' + description.type + '"'));
+    }
+
+    if (!isActionAllowedInSignalingState('setRemoteDescription',
+        description.type, pc.signalingState) || pc._isClosed) {
+      return Promise.reject(makeError('InvalidStateError',
+          'Can not set remote ' + description.type +
+          ' in state ' + pc.signalingState));
+    }
+
+    var streams = {};
+    pc.remoteStreams.forEach(function(stream) {
+      streams[stream.id] = stream;
+    });
+    var receiverList = [];
+    var sections = SDPUtils.splitSections(description.sdp);
+    var sessionpart = sections.shift();
+    var isIceLite = SDPUtils.matchPrefix(sessionpart,
+        'a=ice-lite').length > 0;
+    var usingBundle = SDPUtils.matchPrefix(sessionpart,
+        'a=group:BUNDLE ').length > 0;
+    pc.usingBundle = usingBundle;
+    var iceOptions = SDPUtils.matchPrefix(sessionpart,
+        'a=ice-options:')[0];
+    if (iceOptions) {
+      pc.canTrickleIceCandidates = iceOptions.substr(14).split(' ')
+          .indexOf('trickle') >= 0;
+    } else {
+      pc.canTrickleIceCandidates = false;
+    }
+
+    sections.forEach(function(mediaSection, sdpMLineIndex) {
+      var lines = SDPUtils.splitLines(mediaSection);
+      var kind = SDPUtils.getKind(mediaSection);
+      // treat bundle-only as not-rejected.
+      var rejected = SDPUtils.isRejected(mediaSection) &&
+          SDPUtils.matchPrefix(mediaSection, 'a=bundle-only').length === 0;
+      var protocol = lines[0].substr(2).split(' ')[2];
+
+      var direction = SDPUtils.getDirection(mediaSection, sessionpart);
+      var remoteMsid = SDPUtils.parseMsid(mediaSection);
+
+      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();
+
+      // Reject datachannels which are not implemented yet.
+      if (rejected || (kind === 'application' && (protocol === 'DTLS/SCTP' ||
+          protocol === 'UDP/DTLS/SCTP'))) {
+        // TODO: this is dangerous in the case where a non-rejected m-line
+        //     becomes rejected.
+        pc.transceivers[sdpMLineIndex] = {
+          mid: mid,
+          kind: kind,
+          protocol: protocol,
+          rejected: true
+        };
+        return;
+      }
+
+      if (!rejected && pc.transceivers[sdpMLineIndex] &&
+          pc.transceivers[sdpMLineIndex].rejected) {
+        // recycle a rejected transceiver.
+        pc.transceivers[sdpMLineIndex] = pc._createTransceiver(kind, true);
+      }
+
+      var transceiver;
+      var iceGatherer;
+      var iceTransport;
+      var dtlsTransport;
+      var rtpReceiver;
+      var sendEncodingParameters;
+      var recvEncodingParameters;
+      var localCapabilities;
+
+      var track;
+      // FIXME: ensure the mediaSection has rtcp-mux set.
+      var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);
+      var remoteIceParameters;
+      var remoteDtlsParameters;
+      if (!rejected) {
+        remoteIceParameters = SDPUtils.getIceParameters(mediaSection,
+            sessionpart);
+        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,
+            sessionpart);
+        remoteDtlsParameters.role = 'client';
+      }
+      recvEncodingParameters =
+          SDPUtils.parseRtpEncodingParameters(mediaSection);
+
+      var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);
+
+      var isComplete = SDPUtils.matchPrefix(mediaSection,
+          'a=end-of-candidates', sessionpart).length > 0;
+      var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')
+          .map(function(cand) {
+            return SDPUtils.parseCandidate(cand);
+          })
+          .filter(function(cand) {
+            return cand.component === 1;
+          });
+
+      // Check if we can use BUNDLE and dispose transports.
+      if ((description.type === 'offer' || description.type === 'answer') &&
+          !rejected && usingBundle && sdpMLineIndex > 0 &&
+          pc.transceivers[sdpMLineIndex]) {
+        pc._disposeIceAndDtlsTransports(sdpMLineIndex);
+        pc.transceivers[sdpMLineIndex].iceGatherer =
+            pc.transceivers[0].iceGatherer;
+        pc.transceivers[sdpMLineIndex].iceTransport =
+            pc.transceivers[0].iceTransport;
+        pc.transceivers[sdpMLineIndex].dtlsTransport =
+            pc.transceivers[0].dtlsTransport;
+        if (pc.transceivers[sdpMLineIndex].rtpSender) {
+          pc.transceivers[sdpMLineIndex].rtpSender.setTransport(
+              pc.transceivers[0].dtlsTransport);
+        }
+        if (pc.transceivers[sdpMLineIndex].rtpReceiver) {
+          pc.transceivers[sdpMLineIndex].rtpReceiver.setTransport(
+              pc.transceivers[0].dtlsTransport);
+        }
+      }
+      if (description.type === 'offer' && !rejected) {
+        transceiver = pc.transceivers[sdpMLineIndex] ||
+            pc._createTransceiver(kind);
+        transceiver.mid = mid;
+
+        if (!transceiver.iceGatherer) {
+          transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,
+              usingBundle);
+        }
+
+        if (cands.length && transceiver.iceTransport.state === 'new') {
+          if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {
+            transceiver.iceTransport.setRemoteCandidates(cands);
+          } else {
+            cands.forEach(function(candidate) {
+              maybeAddCandidate(transceiver.iceTransport, candidate);
+            });
+          }
+        }
+
+        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);
+
+        // filter RTX until additional stuff needed for RTX is implemented
+        // in adapter.js
+        if (edgeVersion < 15019) {
+          localCapabilities.codecs = localCapabilities.codecs.filter(
+              function(codec) {
+                return codec.name !== 'rtx';
+              });
+        }
+
+        sendEncodingParameters = transceiver.sendEncodingParameters || [{
+          ssrc: (2 * sdpMLineIndex + 2) * 1001
+        }];
+
+        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams
+        var isNewTrack = false;
+        if (direction === 'sendrecv' || direction === 'sendonly') {
+          isNewTrack = !transceiver.rtpReceiver;
+          rtpReceiver = transceiver.rtpReceiver ||
+              new window.RTCRtpReceiver(transceiver.dtlsTransport, kind);
+
+          if (isNewTrack) {
+            var stream;
+            track = rtpReceiver.track;
+            // FIXME: does not work with Plan B.
+            if (remoteMsid && remoteMsid.stream === '-') {
+              // no-op. a stream id of '-' means: no associated stream.
+            } else if (remoteMsid) {
+              if (!streams[remoteMsid.stream]) {
+                streams[remoteMsid.stream] = new window.MediaStream();
+                Object.defineProperty(streams[remoteMsid.stream], 'id', {
+                  get: function() {
+                    return remoteMsid.stream;
+                  }
+                });
+              }
+              Object.defineProperty(track, 'id', {
+                get: function() {
+                  return remoteMsid.track;
+                }
+              });
+              stream = streams[remoteMsid.stream];
+            } else {
+              if (!streams.default) {
+                streams.default = new window.MediaStream();
+              }
+              stream = streams.default;
+            }
+            if (stream) {
+              addTrackToStreamAndFireEvent(track, stream);
+              transceiver.associatedRemoteMediaStreams.push(stream);
+            }
+            receiverList.push([track, rtpReceiver, stream]);
+          }
+        } else if (transceiver.rtpReceiver && transceiver.rtpReceiver.track) {
+          transceiver.associatedRemoteMediaStreams.forEach(function(s) {
+            var nativeTrack = s.getTracks().find(function(t) {
+              return t.id === transceiver.rtpReceiver.track.id;
+            });
+            if (nativeTrack) {
+              removeTrackFromStreamAndFireEvent(nativeTrack, s);
+            }
+          });
+          transceiver.associatedRemoteMediaStreams = [];
+        }
+
+        transceiver.localCapabilities = localCapabilities;
+        transceiver.remoteCapabilities = remoteCapabilities;
+        transceiver.rtpReceiver = rtpReceiver;
+        transceiver.rtcpParameters = rtcpParameters;
+        transceiver.sendEncodingParameters = sendEncodingParameters;
+        transceiver.recvEncodingParameters = recvEncodingParameters;
+
+        // Start the RTCRtpReceiver now. The RTPSender is started in
+        // setLocalDescription.
+        pc._transceive(pc.transceivers[sdpMLineIndex],
+            false,
+            isNewTrack);
+      } else if (description.type === 'answer' && !rejected) {
+        transceiver = pc.transceivers[sdpMLineIndex];
+        iceGatherer = transceiver.iceGatherer;
+        iceTransport = transceiver.iceTransport;
+        dtlsTransport = transceiver.dtlsTransport;
+        rtpReceiver = transceiver.rtpReceiver;
+        sendEncodingParameters = transceiver.sendEncodingParameters;
+        localCapabilities = transceiver.localCapabilities;
+
+        pc.transceivers[sdpMLineIndex].recvEncodingParameters =
+            recvEncodingParameters;
+        pc.transceivers[sdpMLineIndex].remoteCapabilities =
+            remoteCapabilities;
+        pc.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;
+
+        if (cands.length && iceTransport.state === 'new') {
+          if ((isIceLite || isComplete) &&
+              (!usingBundle || sdpMLineIndex === 0)) {
+            iceTransport.setRemoteCandidates(cands);
+          } else {
+            cands.forEach(function(candidate) {
+              maybeAddCandidate(transceiver.iceTransport, candidate);
+            });
+          }
+        }
+
+        if (!usingBundle || sdpMLineIndex === 0) {
+          if (iceTransport.state === 'new') {
+            iceTransport.start(iceGatherer, remoteIceParameters,
+                'controlling');
+          }
+          if (dtlsTransport.state === 'new') {
+            dtlsTransport.start(remoteDtlsParameters);
+          }
+        }
+
+        // If the offer contained RTX but the answer did not,
+        // remove RTX from sendEncodingParameters.
+        var commonCapabilities = getCommonCapabilities(
+          transceiver.localCapabilities,
+          transceiver.remoteCapabilities);
+
+        var hasRtx = commonCapabilities.codecs.filter(function(c) {
+          return c.name.toLowerCase() === 'rtx';
+        }).length;
+        if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
+          delete transceiver.sendEncodingParameters[0].rtx;
+        }
+
+        pc._transceive(transceiver,
+            direction === 'sendrecv' || direction === 'recvonly',
+            direction === 'sendrecv' || direction === 'sendonly');
+
+        // TODO: rewrite to use http://w3c.github.io/webrtc-pc/#set-associated-remote-streams
+        if (rtpReceiver &&
+            (direction === 'sendrecv' || direction === 'sendonly')) {
+          track = rtpReceiver.track;
+          if (remoteMsid) {
+            if (!streams[remoteMsid.stream]) {
+              streams[remoteMsid.stream] = new window.MediaStream();
+            }
+            addTrackToStreamAndFireEvent(track, streams[remoteMsid.stream]);
+            receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);
+          } else {
+            if (!streams.default) {
+              streams.default = new window.MediaStream();
+            }
+            addTrackToStreamAndFireEvent(track, streams.default);
+            receiverList.push([track, rtpReceiver, streams.default]);
+          }
+        } else {
+          // FIXME: actually the receiver should be created later.
+          delete transceiver.rtpReceiver;
+        }
+      }
+    });
+
+    if (pc._dtlsRole === undefined) {
+      pc._dtlsRole = description.type === 'offer' ? 'active' : 'passive';
+    }
+
+    pc._remoteDescription = {
+      type: description.type,
+      sdp: description.sdp
+    };
+    if (description.type === 'offer') {
+      pc._updateSignalingState('have-remote-offer');
+    } else {
+      pc._updateSignalingState('stable');
+    }
+    Object.keys(streams).forEach(function(sid) {
+      var stream = streams[sid];
+      if (stream.getTracks().length) {
+        if (pc.remoteStreams.indexOf(stream) === -1) {
+          pc.remoteStreams.push(stream);
+          var event = new Event('addstream');
+          event.stream = stream;
+          window.setTimeout(function() {
+            pc._dispatchEvent('addstream', event);
+          });
+        }
+
+        receiverList.forEach(function(item) {
+          var track = item[0];
+          var receiver = item[1];
+          if (stream.id !== item[2].id) {
+            return;
+          }
+          fireAddTrack(pc, track, receiver, [stream]);
+        });
+      }
+    });
+    receiverList.forEach(function(item) {
+      if (item[2]) {
+        return;
+      }
+      fireAddTrack(pc, item[0], item[1], []);
+    });
+
+    // check whether addIceCandidate({}) was called within four seconds after
+    // setRemoteDescription.
+    window.setTimeout(function() {
+      if (!(pc && pc.transceivers)) {
+        return;
+      }
+      pc.transceivers.forEach(function(transceiver) {
+        if (transceiver.iceTransport &&
+            transceiver.iceTransport.state === 'new' &&
+            transceiver.iceTransport.getRemoteCandidates().length > 0) {
+          console.warn('Timeout for addRemoteCandidate. Consider sending ' +
+              'an end-of-candidates notification');
+          transceiver.iceTransport.addRemoteCandidate({});
+        }
+      });
+    }, 4000);
+
+    return Promise.resolve();
+  };
+
+  RTCPeerConnection.prototype.close = function() {
+    this.transceivers.forEach(function(transceiver) {
+      /* not yet
+      if (transceiver.iceGatherer) {
+        transceiver.iceGatherer.close();
+      }
+      */
+      if (transceiver.iceTransport) {
+        transceiver.iceTransport.stop();
+      }
+      if (transceiver.dtlsTransport) {
+        transceiver.dtlsTransport.stop();
+      }
+      if (transceiver.rtpSender) {
+        transceiver.rtpSender.stop();
+      }
+      if (transceiver.rtpReceiver) {
+        transceiver.rtpReceiver.stop();
+      }
+    });
+    // FIXME: clean up tracks, local streams, remote streams, etc
+    this._isClosed = true;
+    this._updateSignalingState('closed');
+  };
+
+  // Update the signaling state.
+  RTCPeerConnection.prototype._updateSignalingState = function(newState) {
+    this.signalingState = newState;
+    var event = new Event('signalingstatechange');
+    this._dispatchEvent('signalingstatechange', event);
+  };
+
+  // Determine whether to fire the negotiationneeded event.
+  RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {
+    var pc = this;
+    if (this.signalingState !== 'stable' || this.needNegotiation === true) {
+      return;
+    }
+    this.needNegotiation = true;
+    window.setTimeout(function() {
+      if (pc.needNegotiation) {
+        pc.needNegotiation = false;
+        var event = new Event('negotiationneeded');
+        pc._dispatchEvent('negotiationneeded', event);
+      }
+    }, 0);
+  };
+
+  // Update the ice connection state.
+  RTCPeerConnection.prototype._updateIceConnectionState = function() {
+    var newState;
+    var states = {
+      'new': 0,
+      closed: 0,
+      checking: 0,
+      connected: 0,
+      completed: 0,
+      disconnected: 0,
+      failed: 0
+    };
+    this.transceivers.forEach(function(transceiver) {
+      if (transceiver.iceTransport && !transceiver.rejected) {
+        states[transceiver.iceTransport.state]++;
+      }
+    });
+
+    newState = 'new';
+    if (states.failed > 0) {
+      newState = 'failed';
+    } else if (states.checking > 0) {
+      newState = 'checking';
+    } else if (states.disconnected > 0) {
+      newState = 'disconnected';
+    } else if (states.new > 0) {
+      newState = 'new';
+    } else if (states.connected > 0) {
+      newState = 'connected';
+    } else if (states.completed > 0) {
+      newState = 'completed';
+    }
+
+    if (newState !== this.iceConnectionState) {
+      this.iceConnectionState = newState;
+      var event = new Event('iceconnectionstatechange');
+      this._dispatchEvent('iceconnectionstatechange', event);
+    }
+  };
+
+  // Update the connection state.
+  RTCPeerConnection.prototype._updateConnectionState = function() {
+    var newState;
+    var states = {
+      'new': 0,
+      closed: 0,
+      connecting: 0,
+      connected: 0,
+      completed: 0,
+      disconnected: 0,
+      failed: 0
+    };
+    this.transceivers.forEach(function(transceiver) {
+      if (transceiver.iceTransport && transceiver.dtlsTransport &&
+          !transceiver.rejected) {
+        states[transceiver.iceTransport.state]++;
+        states[transceiver.dtlsTransport.state]++;
+      }
+    });
+    // ICETransport.completed and connected are the same for this purpose.
+    states.connected += states.completed;
+
+    newState = 'new';
+    if (states.failed > 0) {
+      newState = 'failed';
+    } else if (states.connecting > 0) {
+      newState = 'connecting';
+    } else if (states.disconnected > 0) {
+      newState = 'disconnected';
+    } else if (states.new > 0) {
+      newState = 'new';
+    } else if (states.connected > 0) {
+      newState = 'connected';
+    }
+
+    if (newState !== this.connectionState) {
+      this.connectionState = newState;
+      var event = new Event('connectionstatechange');
+      this._dispatchEvent('connectionstatechange', event);
+    }
+  };
+
+  RTCPeerConnection.prototype.createOffer = function() {
+    var pc = this;
+
+    if (pc._isClosed) {
+      return Promise.reject(makeError('InvalidStateError',
+          'Can not call createOffer after close'));
+    }
+
+    var numAudioTracks = pc.transceivers.filter(function(t) {
+      return t.kind === 'audio';
+    }).length;
+    var numVideoTracks = pc.transceivers.filter(function(t) {
+      return t.kind === 'video';
+    }).length;
+
+    // Determine number of audio and video tracks we need to send/recv.
+    var offerOptions = arguments[0];
+    if (offerOptions) {
+      // Reject Chrome legacy constraints.
+      if (offerOptions.mandatory || offerOptions.optional) {
+        throw new TypeError(
+            'Legacy mandatory/optional constraints not supported.');
+      }
+      if (offerOptions.offerToReceiveAudio !== undefined) {
+        if (offerOptions.offerToReceiveAudio === true) {
+          numAudioTracks = 1;
+        } else if (offerOptions.offerToReceiveAudio === false) {
+          numAudioTracks = 0;
+        } else {
+          numAudioTracks = offerOptions.offerToReceiveAudio;
+        }
+      }
+      if (offerOptions.offerToReceiveVideo !== undefined) {
+        if (offerOptions.offerToReceiveVideo === true) {
+          numVideoTracks = 1;
+        } else if (offerOptions.offerToReceiveVideo === false) {
+          numVideoTracks = 0;
+        } else {
+          numVideoTracks = offerOptions.offerToReceiveVideo;
+        }
+      }
+    }
+
+    pc.transceivers.forEach(function(transceiver) {
+      if (transceiver.kind === 'audio') {
+        numAudioTracks--;
+        if (numAudioTracks < 0) {
+          transceiver.wantReceive = false;
+        }
+      } else if (transceiver.kind === 'video') {
+        numVideoTracks--;
+        if (numVideoTracks < 0) {
+          transceiver.wantReceive = false;
+        }
+      }
+    });
+
+    // Create M-lines for recvonly streams.
+    while (numAudioTracks > 0 || numVideoTracks > 0) {
+      if (numAudioTracks > 0) {
+        pc._createTransceiver('audio');
+        numAudioTracks--;
+      }
+      if (numVideoTracks > 0) {
+        pc._createTransceiver('video');
+        numVideoTracks--;
+      }
+    }
+
+    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,
+        pc._sdpSessionVersion++);
+    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
+      // For each track, create an ice gatherer, ice transport,
+      // dtls transport, potentially rtpsender and rtpreceiver.
+      var track = transceiver.track;
+      var kind = transceiver.kind;
+      var mid = transceiver.mid || SDPUtils.generateIdentifier();
+      transceiver.mid = mid;
+
+      if (!transceiver.iceGatherer) {
+        transceiver.iceGatherer = pc._createIceGatherer(sdpMLineIndex,
+            pc.usingBundle);
+      }
+
+      var localCapabilities = window.RTCRtpSender.getCapabilities(kind);
+      // filter RTX until additional stuff needed for RTX is implemented
+      // in adapter.js
+      if (edgeVersion < 15019) {
+        localCapabilities.codecs = localCapabilities.codecs.filter(
+            function(codec) {
+              return codec.name !== 'rtx';
+            });
+      }
+      localCapabilities.codecs.forEach(function(codec) {
+        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552
+        // by adding level-asymmetry-allowed=1
+        if (codec.name === 'H264' &&
+            codec.parameters['level-asymmetry-allowed'] === undefined) {
+          codec.parameters['level-asymmetry-allowed'] = '1';
+        }
+
+        // for subsequent offers, we might have to re-use the payload
+        // type of the last offer.
+        if (transceiver.remoteCapabilities &&
+            transceiver.remoteCapabilities.codecs) {
+          transceiver.remoteCapabilities.codecs.forEach(function(remoteCodec) {
+            if (codec.name.toLowerCase() === remoteCodec.name.toLowerCase() &&
+                codec.clockRate === remoteCodec.clockRate) {
+              codec.preferredPayloadType = remoteCodec.payloadType;
+            }
+          });
+        }
+      });
+      localCapabilities.headerExtensions.forEach(function(hdrExt) {
+        var remoteExtensions = transceiver.remoteCapabilities &&
+            transceiver.remoteCapabilities.headerExtensions || [];
+        remoteExtensions.forEach(function(rHdrExt) {
+          if (hdrExt.uri === rHdrExt.uri) {
+            hdrExt.id = rHdrExt.id;
+          }
+        });
+      });
+
+      // generate an ssrc now, to be used later in rtpSender.send
+      var sendEncodingParameters = transceiver.sendEncodingParameters || [{
+        ssrc: (2 * sdpMLineIndex + 1) * 1001
+      }];
+      if (track) {
+        // add RTX
+        if (edgeVersion >= 15019 && kind === 'video' &&
+            !sendEncodingParameters[0].rtx) {
+          sendEncodingParameters[0].rtx = {
+            ssrc: sendEncodingParameters[0].ssrc + 1
+          };
+        }
+      }
+
+      if (transceiver.wantReceive) {
+        transceiver.rtpReceiver = new window.RTCRtpReceiver(
+            transceiver.dtlsTransport, kind);
+      }
+
+      transceiver.localCapabilities = localCapabilities;
+      transceiver.sendEncodingParameters = sendEncodingParameters;
+    });
+
+    // always offer BUNDLE and dispose on return if not supported.
+    if (pc._config.bundlePolicy !== 'max-compat') {
+      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {
+        return t.mid;
+      }).join(' ') + '\r\n';
+    }
+    sdp += 'a=ice-options:trickle\r\n';
+
+    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
+      sdp += writeMediaSection(transceiver, transceiver.localCapabilities,
+          'offer', transceiver.stream, pc._dtlsRole);
+      sdp += 'a=rtcp-rsize\r\n';
+
+      if (transceiver.iceGatherer && pc.iceGatheringState !== 'new' &&
+          (sdpMLineIndex === 0 || !pc.usingBundle)) {
+        transceiver.iceGatherer.getLocalCandidates().forEach(function(cand) {
+          cand.component = 1;
+          sdp += 'a=' + SDPUtils.writeCandidate(cand) + '\r\n';
+        });
+
+        if (transceiver.iceGatherer.state === 'completed') {
+          sdp += 'a=end-of-candidates\r\n';
+        }
+      }
+    });
+
+    var desc = new window.RTCSessionDescription({
+      type: 'offer',
+      sdp: sdp
+    });
+    return Promise.resolve(desc);
+  };
+
+  RTCPeerConnection.prototype.createAnswer = function() {
+    var pc = this;
+
+    if (pc._isClosed) {
+      return Promise.reject(makeError('InvalidStateError',
+          'Can not call createAnswer after close'));
+    }
+
+    if (!(pc.signalingState === 'have-remote-offer' ||
+        pc.signalingState === 'have-local-pranswer')) {
+      return Promise.reject(makeError('InvalidStateError',
+          'Can not call createAnswer in signalingState ' + pc.signalingState));
+    }
+
+    var sdp = SDPUtils.writeSessionBoilerplate(pc._sdpSessionId,
+        pc._sdpSessionVersion++);
+    if (pc.usingBundle) {
+      sdp += 'a=group:BUNDLE ' + pc.transceivers.map(function(t) {
+        return t.mid;
+      }).join(' ') + '\r\n';
+    }
+    sdp += 'a=ice-options:trickle\r\n';
+
+    var mediaSectionsInOffer = SDPUtils.getMediaSections(
+        pc._remoteDescription.sdp).length;
+    pc.transceivers.forEach(function(transceiver, sdpMLineIndex) {
+      if (sdpMLineIndex + 1 > mediaSectionsInOffer) {
+        return;
+      }
+      if (transceiver.rejected) {
+        if (transceiver.kind === 'application') {
+          if (transceiver.protocol === 'DTLS/SCTP') { // legacy fmt
+            sdp += 'm=application 0 DTLS/SCTP 5000\r\n';
+          } else {
+            sdp += 'm=application 0 ' + transceiver.protocol +
+                ' webrtc-datachannel\r\n';
+          }
+        } else if (transceiver.kind === 'audio') {
+          sdp += 'm=audio 0 UDP/TLS/RTP/SAVPF 0\r\n' +
+              'a=rtpmap:0 PCMU/8000\r\n';
+        } else if (transceiver.kind === 'video') {
+          sdp += 'm=video 0 UDP/TLS/RTP/SAVPF 120\r\n' +
+              'a=rtpmap:120 VP8/90000\r\n';
+        }
+        sdp += 'c=IN IP4 0.0.0.0\r\n' +
+            'a=inactive\r\n' +
+            'a=mid:' + transceiver.mid + '\r\n';
+        return;
+      }
+
+      // FIXME: look at direction.
+      if (transceiver.stream) {
+        var localTrack;
+        if (transceiver.kind === 'audio') {
+          localTrack = transceiver.stream.getAudioTracks()[0];
+        } else if (transceiver.kind === 'video') {
+          localTrack = transceiver.stream.getVideoTracks()[0];
+        }
+        if (localTrack) {
+          // add RTX
+          if (edgeVersion >= 15019 && transceiver.kind === 'video' &&
+              !transceiver.sendEncodingParameters[0].rtx) {
+            transceiver.sendEncodingParameters[0].rtx = {
+              ssrc: transceiver.sendEncodingParameters[0].ssrc + 1
+            };
+          }
+        }
+      }
+
+      // Calculate intersection of capabilities.
+      var commonCapabilities = getCommonCapabilities(
+          transceiver.localCapabilities,
+          transceiver.remoteCapabilities);
+
+      var hasRtx = commonCapabilities.codecs.filter(function(c) {
+        return c.name.toLowerCase() === 'rtx';
+      }).length;
+      if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
+        delete transceiver.sendEncodingParameters[0].rtx;
+      }
+
+      sdp += writeMediaSection(transceiver, commonCapabilities,
+          'answer', transceiver.stream, pc._dtlsRole);
+      if (transceiver.rtcpParameters &&
+          transceiver.rtcpParameters.reducedSize) {
+        sdp += 'a=rtcp-rsize\r\n';
+      }
+    });
+
+    var desc = new window.RTCSessionDescription({
+      type: 'answer',
+      sdp: sdp
+    });
+    return Promise.resolve(desc);
+  };
+
+  RTCPeerConnection.prototype.addIceCandidate = function(candidate) {
+    var pc = this;
+    var sections;
+    if (candidate && !(candidate.sdpMLineIndex !== undefined ||
+        candidate.sdpMid)) {
+      return Promise.reject(new TypeError('sdpMLineIndex or sdpMid required'));
+    }
+
+    // TODO: needs to go into ops queue.
+    return new Promise(function(resolve, reject) {
+      if (!pc._remoteDescription) {
+        return reject(makeError('InvalidStateError',
+            'Can not add ICE candidate without a remote description'));
+      } else if (!candidate || candidate.candidate === '') {
+        for (var j = 0; j < pc.transceivers.length; j++) {
+          if (pc.transceivers[j].rejected) {
+            continue;
+          }
+          pc.transceivers[j].iceTransport.addRemoteCandidate({});
+          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);
+          sections[j] += 'a=end-of-candidates\r\n';
+          pc._remoteDescription.sdp =
+              SDPUtils.getDescription(pc._remoteDescription.sdp) +
+              sections.join('');
+          if (pc.usingBundle) {
+            break;
+          }
+        }
+      } else {
+        var sdpMLineIndex = candidate.sdpMLineIndex;
+        if (candidate.sdpMid) {
+          for (var i = 0; i < pc.transceivers.length; i++) {
+            if (pc.transceivers[i].mid === candidate.sdpMid) {
+              sdpMLineIndex = i;
+              break;
+            }
+          }
+        }
+        var transceiver = pc.transceivers[sdpMLineIndex];
+        if (transceiver) {
+          if (transceiver.rejected) {
+            return resolve();
+          }
+          var cand = Object.keys(candidate.candidate).length > 0 ?
+              SDPUtils.parseCandidate(candidate.candidate) : {};
+          // Ignore Chrome's invalid candidates since Edge does not like them.
+          if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {
+            return resolve();
+          }
+          // Ignore RTCP candidates, we assume RTCP-MUX.
+          if (cand.component && cand.component !== 1) {
+            return resolve();
+          }
+          // when using bundle, avoid adding candidates to the wrong
+          // ice transport. And avoid adding candidates added in the SDP.
+          if (sdpMLineIndex === 0 || (sdpMLineIndex > 0 &&
+              transceiver.iceTransport !== pc.transceivers[0].iceTransport)) {
+            if (!maybeAddCandidate(transceiver.iceTransport, cand)) {
+              return reject(makeError('OperationError',
+                  'Can not add ICE candidate'));
+            }
+          }
+
+          // update the remoteDescription.
+          var candidateString = candidate.candidate.trim();
+          if (candidateString.indexOf('a=') === 0) {
+            candidateString = candidateString.substr(2);
+          }
+          sections = SDPUtils.getMediaSections(pc._remoteDescription.sdp);
+          sections[sdpMLineIndex] += 'a=' +
+              (cand.type ? candidateString : 'end-of-candidates')
+              + '\r\n';
+          pc._remoteDescription.sdp =
+              SDPUtils.getDescription(pc._remoteDescription.sdp) +
+              sections.join('');
+        } else {
+          return reject(makeError('OperationError',
+              'Can not add ICE candidate'));
+        }
+      }
+      resolve();
+    });
+  };
+
+  RTCPeerConnection.prototype.getStats = function(selector) {
+    if (selector && selector instanceof window.MediaStreamTrack) {
+      var senderOrReceiver = null;
+      this.transceivers.forEach(function(transceiver) {
+        if (transceiver.rtpSender &&
+            transceiver.rtpSender.track === selector) {
+          senderOrReceiver = transceiver.rtpSender;
+        } else if (transceiver.rtpReceiver &&
+            transceiver.rtpReceiver.track === selector) {
+          senderOrReceiver = transceiver.rtpReceiver;
+        }
+      });
+      if (!senderOrReceiver) {
+        throw makeError('InvalidAccessError', 'Invalid selector.');
+      }
+      return senderOrReceiver.getStats();
+    }
+
+    var promises = [];
+    this.transceivers.forEach(function(transceiver) {
+      ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',
+          'dtlsTransport'].forEach(function(method) {
+            if (transceiver[method]) {
+              promises.push(transceiver[method].getStats());
+            }
+          });
+    });
+    return Promise.all(promises).then(function(allStats) {
+      var results = new Map();
+      allStats.forEach(function(stats) {
+        stats.forEach(function(stat) {
+          results.set(stat.id, stat);
+        });
+      });
+      return results;
+    });
+  };
+
+  // fix low-level stat names and return Map instead of object.
+  var ortcObjects = ['RTCRtpSender', 'RTCRtpReceiver', 'RTCIceGatherer',
+    'RTCIceTransport', 'RTCDtlsTransport'];
+  ortcObjects.forEach(function(ortcObjectName) {
+    var obj = window[ortcObjectName];
+    if (obj && obj.prototype && obj.prototype.getStats) {
+      var nativeGetstats = obj.prototype.getStats;
+      obj.prototype.getStats = function() {
+        return nativeGetstats.apply(this)
+        .then(function(nativeStats) {
+          var mapStats = new Map();
+          Object.keys(nativeStats).forEach(function(id) {
+            nativeStats[id].type = fixStatsType(nativeStats[id]);
+            mapStats.set(id, nativeStats[id]);
+          });
+          return mapStats;
+        });
+      };
+    }
+  });
+
+  // legacy callback shims. Should be moved to adapter.js some days.
+  var methods = ['createOffer', 'createAnswer'];
+  methods.forEach(function(method) {
+    var nativeMethod = RTCPeerConnection.prototype[method];
+    RTCPeerConnection.prototype[method] = function() {
+      var args = arguments;
+      if (typeof args[0] === 'function' ||
+          typeof args[1] === 'function') { // legacy
+        return nativeMethod.apply(this, [arguments[2]])
+        .then(function(description) {
+          if (typeof args[0] === 'function') {
+            args[0].apply(null, [description]);
+          }
+        }, function(error) {
+          if (typeof args[1] === 'function') {
+            args[1].apply(null, [error]);
+          }
+        });
+      }
+      return nativeMethod.apply(this, arguments);
+    };
+  });
+
+  methods = ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate'];
+  methods.forEach(function(method) {
+    var nativeMethod = RTCPeerConnection.prototype[method];
+    RTCPeerConnection.prototype[method] = function() {
+      var args = arguments;
+      if (typeof args[1] === 'function' ||
+          typeof args[2] === 'function') { // legacy
+        return nativeMethod.apply(this, arguments)
+        .then(function() {
+          if (typeof args[1] === 'function') {
+            args[1].apply(null);
+          }
+        }, function(error) {
+          if (typeof args[2] === 'function') {
+            args[2].apply(null, [error]);
+          }
+        });
+      }
+      return nativeMethod.apply(this, arguments);
+    };
+  });
+
+  // getStats is special. It doesn't have a spec legacy method yet we support
+  // getStats(something, cb) without error callbacks.
+  ['getStats'].forEach(function(method) {
+    var nativeMethod = RTCPeerConnection.prototype[method];
+    RTCPeerConnection.prototype[method] = function() {
+      var args = arguments;
+      if (typeof args[1] === 'function') {
+        return nativeMethod.apply(this, arguments)
+        .then(function() {
+          if (typeof args[1] === 'function') {
+            args[1].apply(null);
+          }
+        });
+      }
+      return nativeMethod.apply(this, arguments);
+    };
+  });
+
+  return RTCPeerConnection;
+};
+
+},{"sdp":17}],17:[function(require,module,exports){
+/* eslint-env node */
+'use strict';
+
+// SDP helpers.
+var SDPUtils = {};
+
+// Generate an alphanumeric identifier for cname or mids.
+// TODO: use UUIDs instead? https://gist.github.com/jed/982883
+SDPUtils.generateIdentifier = function() {
+  return Math.random().toString(36).substr(2, 10);
+};
+
+// The RTCP CNAME used by all peerconnections from the same JS.
+SDPUtils.localCName = SDPUtils.generateIdentifier();
+
+// Splits SDP into lines, dealing with both CRLF and LF.
+SDPUtils.splitLines = function(blob) {
+  return blob.trim().split('\n').map(function(line) {
+    return line.trim();
+  });
+};
+// Splits SDP into sessionpart and mediasections. Ensures CRLF.
+SDPUtils.splitSections = function(blob) {
+  var parts = blob.split('\nm=');
+  return parts.map(function(part, index) {
+    return (index > 0 ? 'm=' + part : part).trim() + '\r\n';
+  });
+};
+
+// returns the session description.
+SDPUtils.getDescription = function(blob) {
+  var sections = SDPUtils.splitSections(blob);
+  return sections && sections[0];
+};
+
+// returns the individual media sections.
+SDPUtils.getMediaSections = function(blob) {
+  var sections = SDPUtils.splitSections(blob);
+  sections.shift();
+  return sections;
+};
+
+// Returns lines that start with a certain prefix.
+SDPUtils.matchPrefix = function(blob, prefix) {
+  return SDPUtils.splitLines(blob).filter(function(line) {
+    return line.indexOf(prefix) === 0;
+  });
+};
+
+// Parses an ICE candidate line. Sample input:
+// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8
+// rport 55996"
+SDPUtils.parseCandidate = function(line) {
+  var parts;
+  // Parse both variants.
+  if (line.indexOf('a=candidate:') === 0) {
+    parts = line.substring(12).split(' ');
+  } else {
+    parts = line.substring(10).split(' ');
+  }
+
+  var candidate = {
+    foundation: parts[0],
+    component: parseInt(parts[1], 10),
+    protocol: parts[2].toLowerCase(),
+    priority: parseInt(parts[3], 10),
+    ip: parts[4],
+    address: parts[4], // address is an alias for ip.
+    port: parseInt(parts[5], 10),
+    // skip parts[6] == 'typ'
+    type: parts[7]
+  };
+
+  for (var i = 8; i < parts.length; i += 2) {
+    switch (parts[i]) {
+      case 'raddr':
+        candidate.relatedAddress = parts[i + 1];
+        break;
+      case 'rport':
+        candidate.relatedPort = parseInt(parts[i + 1], 10);
+        break;
+      case 'tcptype':
+        candidate.tcpType = parts[i + 1];
+        break;
+      case 'ufrag':
+        candidate.ufrag = parts[i + 1]; // for backward compability.
+        candidate.usernameFragment = parts[i + 1];
+        break;
+      default: // extension handling, in particular ufrag
+        candidate[parts[i]] = parts[i + 1];
+        break;
+    }
+  }
+  return candidate;
+};
+
+// Translates a candidate object into SDP candidate attribute.
+SDPUtils.writeCandidate = function(candidate) {
+  var sdp = [];
+  sdp.push(candidate.foundation);
+  sdp.push(candidate.component);
+  sdp.push(candidate.protocol.toUpperCase());
+  sdp.push(candidate.priority);
+  sdp.push(candidate.address || candidate.ip);
+  sdp.push(candidate.port);
+
+  var type = candidate.type;
+  sdp.push('typ');
+  sdp.push(type);
+  if (type !== 'host' && candidate.relatedAddress &&
+      candidate.relatedPort) {
+    sdp.push('raddr');
+    sdp.push(candidate.relatedAddress);
+    sdp.push('rport');
+    sdp.push(candidate.relatedPort);
+  }
+  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {
+    sdp.push('tcptype');
+    sdp.push(candidate.tcpType);
+  }
+  if (candidate.usernameFragment || candidate.ufrag) {
+    sdp.push('ufrag');
+    sdp.push(candidate.usernameFragment || candidate.ufrag);
+  }
+  return 'candidate:' + sdp.join(' ');
+};
+
+// Parses an ice-options line, returns an array of option tags.
+// a=ice-options:foo bar
+SDPUtils.parseIceOptions = function(line) {
+  return line.substr(14).split(' ');
+};
+
+// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:
+// a=rtpmap:111 opus/48000/2
+SDPUtils.parseRtpMap = function(line) {
+  var parts = line.substr(9).split(' ');
+  var parsed = {
+    payloadType: parseInt(parts.shift(), 10) // was: id
+  };
+
+  parts = parts[0].split('/');
+
+  parsed.name = parts[0];
+  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate
+  parsed.channels = parts.length === 3 ? parseInt(parts[2], 10) : 1;
+  // legacy alias, got renamed back to channels in ORTC.
+  parsed.numChannels = parsed.channels;
+  return parsed;
+};
+
+// Generate an a=rtpmap line from RTCRtpCodecCapability or
+// RTCRtpCodecParameters.
+SDPUtils.writeRtpMap = function(codec) {
+  var pt = codec.payloadType;
+  if (codec.preferredPayloadType !== undefined) {
+    pt = codec.preferredPayloadType;
+  }
+  var channels = codec.channels || codec.numChannels || 1;
+  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +
+      (channels !== 1 ? '/' + channels : '') + '\r\n';
+};
+
+// Parses an a=extmap line (headerextension from RFC 5285). Sample input:
+// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
+// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset
+SDPUtils.parseExtmap = function(line) {
+  var parts = line.substr(9).split(' ');
+  return {
+    id: parseInt(parts[0], 10),
+    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',
+    uri: parts[1]
+  };
+};
+
+// Generates a=extmap line from RTCRtpHeaderExtensionParameters or
+// RTCRtpHeaderExtension.
+SDPUtils.writeExtmap = function(headerExtension) {
+  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +
+      (headerExtension.direction && headerExtension.direction !== 'sendrecv'
+        ? '/' + headerExtension.direction
+        : '') +
+      ' ' + headerExtension.uri + '\r\n';
+};
+
+// Parses an ftmp line, returns dictionary. Sample input:
+// a=fmtp:96 vbr=on;cng=on
+// Also deals with vbr=on; cng=on
+SDPUtils.parseFmtp = function(line) {
+  var parsed = {};
+  var kv;
+  var parts = line.substr(line.indexOf(' ') + 1).split(';');
+  for (var j = 0; j < parts.length; j++) {
+    kv = parts[j].trim().split('=');
+    parsed[kv[0].trim()] = kv[1];
+  }
+  return parsed;
+};
+
+// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.
+SDPUtils.writeFmtp = function(codec) {
+  var line = '';
+  var pt = codec.payloadType;
+  if (codec.preferredPayloadType !== undefined) {
+    pt = codec.preferredPayloadType;
+  }
+  if (codec.parameters && Object.keys(codec.parameters).length) {
+    var params = [];
+    Object.keys(codec.parameters).forEach(function(param) {
+      if (codec.parameters[param]) {
+        params.push(param + '=' + codec.parameters[param]);
+      } else {
+        params.push(param);
+      }
+    });
+    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\r\n';
+  }
+  return line;
+};
+
+// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:
+// a=rtcp-fb:98 nack rpsi
+SDPUtils.parseRtcpFb = function(line) {
+  var parts = line.substr(line.indexOf(' ') + 1).split(' ');
+  return {
+    type: parts.shift(),
+    parameter: parts.join(' ')
+  };
+};
+// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.
+SDPUtils.writeRtcpFb = function(codec) {
+  var lines = '';
+  var pt = codec.payloadType;
+  if (codec.preferredPayloadType !== undefined) {
+    pt = codec.preferredPayloadType;
+  }
+  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {
+    // FIXME: special handling for trr-int?
+    codec.rtcpFeedback.forEach(function(fb) {
+      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +
+      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +
+          '\r\n';
+    });
+  }
+  return lines;
+};
+
+// Parses an RFC 5576 ssrc media attribute. Sample input:
+// a=ssrc:3735928559 cname:something
+SDPUtils.parseSsrcMedia = function(line) {
+  var sp = line.indexOf(' ');
+  var parts = {
+    ssrc: parseInt(line.substr(7, sp - 7), 10)
+  };
+  var colon = line.indexOf(':', sp);
+  if (colon > -1) {
+    parts.attribute = line.substr(sp + 1, colon - sp - 1);
+    parts.value = line.substr(colon + 1);
+  } else {
+    parts.attribute = line.substr(sp + 1);
+  }
+  return parts;
+};
+
+SDPUtils.parseSsrcGroup = function(line) {
+  var parts = line.substr(13).split(' ');
+  return {
+    semantics: parts.shift(),
+    ssrcs: parts.map(function(ssrc) {
+      return parseInt(ssrc, 10);
+    })
+  };
+};
+
+// Extracts the MID (RFC 5888) from a media section.
+// returns the MID or undefined if no mid line was found.
+SDPUtils.getMid = function(mediaSection) {
+  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];
+  if (mid) {
+    return mid.substr(6);
+  }
+};
+
+SDPUtils.parseFingerprint = function(line) {
+  var parts = line.substr(14).split(' ');
+  return {
+    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.
+    value: parts[1]
+  };
+};
+
+// Extracts DTLS parameters from SDP media section or sessionpart.
+// FIXME: for consistency with other functions this should only
+//   get the fingerprint line as input. See also getIceParameters.
+SDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {
+  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,
+    'a=fingerprint:');
+  // Note: a=setup line is ignored since we use the 'auto' role.
+  // Note2: 'algorithm' is not case sensitive except in Edge.
+  return {
+    role: 'auto',
+    fingerprints: lines.map(SDPUtils.parseFingerprint)
+  };
+};
+
+// Serializes DTLS parameters to SDP.
+SDPUtils.writeDtlsParameters = function(params, setupType) {
+  var sdp = 'a=setup:' + setupType + '\r\n';
+  params.fingerprints.forEach(function(fp) {
+    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\r\n';
+  });
+  return sdp;
+};
+// Parses ICE information from SDP media section or sessionpart.
+// FIXME: for consistency with other functions this should only
+//   get the ice-ufrag and ice-pwd lines as input.
+SDPUtils.getIceParameters = function(mediaSection, sessionpart) {
+  var lines = SDPUtils.splitLines(mediaSection);
+  // Search in session part, too.
+  lines = lines.concat(SDPUtils.splitLines(sessionpart));
+  var iceParameters = {
+    usernameFragment: lines.filter(function(line) {
+      return line.indexOf('a=ice-ufrag:') === 0;
+    })[0].substr(12),
+    password: lines.filter(function(line) {
+      return line.indexOf('a=ice-pwd:') === 0;
+    })[0].substr(10)
+  };
+  return iceParameters;
+};
+
+// Serializes ICE parameters to SDP.
+SDPUtils.writeIceParameters = function(params) {
+  return 'a=ice-ufrag:' + params.usernameFragment + '\r\n' +
+      'a=ice-pwd:' + params.password + '\r\n';
+};
+
+// Parses the SDP media section and returns RTCRtpParameters.
+SDPUtils.parseRtpParameters = function(mediaSection) {
+  var description = {
+    codecs: [],
+    headerExtensions: [],
+    fecMechanisms: [],
+    rtcp: []
+  };
+  var lines = SDPUtils.splitLines(mediaSection);
+  var mline = lines[0].split(' ');
+  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]
+    var pt = mline[i];
+    var rtpmapline = SDPUtils.matchPrefix(
+      mediaSection, 'a=rtpmap:' + pt + ' ')[0];
+    if (rtpmapline) {
+      var codec = SDPUtils.parseRtpMap(rtpmapline);
+      var fmtps = SDPUtils.matchPrefix(
+        mediaSection, 'a=fmtp:' + pt + ' ');
+      // Only the first a=fmtp:<pt> is considered.
+      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};
+      codec.rtcpFeedback = SDPUtils.matchPrefix(
+        mediaSection, 'a=rtcp-fb:' + pt + ' ')
+        .map(SDPUtils.parseRtcpFb);
+      description.codecs.push(codec);
+      // parse FEC mechanisms from rtpmap lines.
+      switch (codec.name.toUpperCase()) {
+        case 'RED':
+        case 'ULPFEC':
+          description.fecMechanisms.push(codec.name.toUpperCase());
+          break;
+        default: // only RED and ULPFEC are recognized as FEC mechanisms.
+          break;
+      }
+    }
+  }
+  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {
+    description.headerExtensions.push(SDPUtils.parseExtmap(line));
+  });
+  // FIXME: parse rtcp.
+  return description;
+};
+
+// Generates parts of the SDP media section describing the capabilities /
+// parameters.
+SDPUtils.writeRtpDescription = function(kind, caps) {
+  var sdp = '';
+
+  // Build the mline.
+  sdp += 'm=' + kind + ' ';
+  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.
+  sdp += ' UDP/TLS/RTP/SAVPF ';
+  sdp += caps.codecs.map(function(codec) {
+    if (codec.preferredPayloadType !== undefined) {
+      return codec.preferredPayloadType;
+    }
+    return codec.payloadType;
+  }).join(' ') + '\r\n';
+
+  sdp += 'c=IN IP4 0.0.0.0\r\n';
+  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\r\n';
+
+  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.
+  caps.codecs.forEach(function(codec) {
+    sdp += SDPUtils.writeRtpMap(codec);
+    sdp += SDPUtils.writeFmtp(codec);
+    sdp += SDPUtils.writeRtcpFb(codec);
+  });
+  var maxptime = 0;
+  caps.codecs.forEach(function(codec) {
+    if (codec.maxptime > maxptime) {
+      maxptime = codec.maxptime;
+    }
+  });
+  if (maxptime > 0) {
+    sdp += 'a=maxptime:' + maxptime + '\r\n';
+  }
+  sdp += 'a=rtcp-mux\r\n';
+
+  if (caps.headerExtensions) {
+    caps.headerExtensions.forEach(function(extension) {
+      sdp += SDPUtils.writeExtmap(extension);
+    });
+  }
+  // FIXME: write fecMechanisms.
+  return sdp;
+};
+
+// Parses the SDP media section and returns an array of
+// RTCRtpEncodingParameters.
+SDPUtils.parseRtpEncodingParameters = function(mediaSection) {
+  var encodingParameters = [];
+  var description = SDPUtils.parseRtpParameters(mediaSection);
+  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;
+  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;
+
+  // filter a=ssrc:... cname:, ignore PlanB-msid
+  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
+    .map(function(line) {
+      return SDPUtils.parseSsrcMedia(line);
+    })
+    .filter(function(parts) {
+      return parts.attribute === 'cname';
+    });
+  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;
+  var secondarySsrc;
+
+  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')
+    .map(function(line) {
+      var parts = line.substr(17).split(' ');
+      return parts.map(function(part) {
+        return parseInt(part, 10);
+      });
+    });
+  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {
+    secondarySsrc = flows[0][1];
+  }
+
+  description.codecs.forEach(function(codec) {
+    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {
+      var encParam = {
+        ssrc: primarySsrc,
+        codecPayloadType: parseInt(codec.parameters.apt, 10)
+      };
+      if (primarySsrc && secondarySsrc) {
+        encParam.rtx = {ssrc: secondarySsrc};
+      }
+      encodingParameters.push(encParam);
+      if (hasRed) {
+        encParam = JSON.parse(JSON.stringify(encParam));
+        encParam.fec = {
+          ssrc: primarySsrc,
+          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'
+        };
+        encodingParameters.push(encParam);
+      }
+    }
+  });
+  if (encodingParameters.length === 0 && primarySsrc) {
+    encodingParameters.push({
+      ssrc: primarySsrc
+    });
+  }
+
+  // we support both b=AS and b=TIAS but interpret AS as TIAS.
+  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');
+  if (bandwidth.length) {
+    if (bandwidth[0].indexOf('b=TIAS:') === 0) {
+      bandwidth = parseInt(bandwidth[0].substr(7), 10);
+    } else if (bandwidth[0].indexOf('b=AS:') === 0) {
+      // use formula from JSEP to convert b=AS to TIAS value.
+      bandwidth = parseInt(bandwidth[0].substr(5), 10) * 1000 * 0.95
+          - (50 * 40 * 8);
+    } else {
+      bandwidth = undefined;
+    }
+    encodingParameters.forEach(function(params) {
+      params.maxBitrate = bandwidth;
+    });
+  }
+  return encodingParameters;
+};
+
+// parses http://draft.ortc.org/#rtcrtcpparameters*
+SDPUtils.parseRtcpParameters = function(mediaSection) {
+  var rtcpParameters = {};
+
+  // Gets the first SSRC. Note tha with RTX there might be multiple
+  // SSRCs.
+  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
+    .map(function(line) {
+      return SDPUtils.parseSsrcMedia(line);
+    })
+    .filter(function(obj) {
+      return obj.attribute === 'cname';
+    })[0];
+  if (remoteSsrc) {
+    rtcpParameters.cname = remoteSsrc.value;
+    rtcpParameters.ssrc = remoteSsrc.ssrc;
+  }
+
+  // Edge uses the compound attribute instead of reducedSize
+  // compound is !reducedSize
+  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');
+  rtcpParameters.reducedSize = rsize.length > 0;
+  rtcpParameters.compound = rsize.length === 0;
+
+  // parses the rtcp-mux attrіbute.
+  // Note that Edge does not support unmuxed RTCP.
+  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');
+  rtcpParameters.mux = mux.length > 0;
+
+  return rtcpParameters;
+};
+
+// parses either a=msid: or a=ssrc:... msid lines and returns
+// the id of the MediaStream and MediaStreamTrack.
+SDPUtils.parseMsid = function(mediaSection) {
+  var parts;
+  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');
+  if (spec.length === 1) {
+    parts = spec[0].substr(7).split(' ');
+    return {stream: parts[0], track: parts[1]};
+  }
+  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
+    .map(function(line) {
+      return SDPUtils.parseSsrcMedia(line);
+    })
+    .filter(function(msidParts) {
+      return msidParts.attribute === 'msid';
+    });
+  if (planB.length > 0) {
+    parts = planB[0].value.split(' ');
+    return {stream: parts[0], track: parts[1]};
+  }
+};
+
+// SCTP
+// parses draft-ietf-mmusic-sctp-sdp-26 first and falls back
+// to draft-ietf-mmusic-sctp-sdp-05
+SDPUtils.parseSctpDescription = function(mediaSection) {
+  var mline = SDPUtils.parseMLine(mediaSection);
+  var maxSizeLine = SDPUtils.matchPrefix(mediaSection, 'a=max-message-size:');
+  var maxMessageSize;
+  if (maxSizeLine.length > 0) {
+    maxMessageSize = parseInt(maxSizeLine[0].substr(19), 10);
+  }
+  if (isNaN(maxMessageSize)) {
+    maxMessageSize = 65536;
+  }
+  var sctpPort = SDPUtils.matchPrefix(mediaSection, 'a=sctp-port:');
+  if (sctpPort.length > 0) {
+    return {
+      port: parseInt(sctpPort[0].substr(12), 10),
+      protocol: mline.fmt,
+      maxMessageSize: maxMessageSize
+    };
+  }
+  var sctpMapLines = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:');
+  if (sctpMapLines.length > 0) {
+    var parts = SDPUtils.matchPrefix(mediaSection, 'a=sctpmap:')[0]
+      .substr(10)
+      .split(' ');
+    return {
+      port: parseInt(parts[0], 10),
+      protocol: parts[1],
+      maxMessageSize: maxMessageSize
+    };
+  }
+};
+
+// SCTP
+// outputs the draft-ietf-mmusic-sctp-sdp-26 version that all browsers
+// support by now receiving in this format, unless we originally parsed
+// as the draft-ietf-mmusic-sctp-sdp-05 format (indicated by the m-line
+// protocol of DTLS/SCTP -- without UDP/ or TCP/)
+SDPUtils.writeSctpDescription = function(media, sctp) {
+  var output = [];
+  if (media.protocol !== 'DTLS/SCTP') {
+    output = [
+      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.protocol + '\r\n',
+      'c=IN IP4 0.0.0.0\r\n',
+      'a=sctp-port:' + sctp.port + '\r\n'
+    ];
+  } else {
+    output = [
+      'm=' + media.kind + ' 9 ' + media.protocol + ' ' + sctp.port + '\r\n',
+      'c=IN IP4 0.0.0.0\r\n',
+      'a=sctpmap:' + sctp.port + ' ' + sctp.protocol + ' 65535\r\n'
+    ];
+  }
+  if (sctp.maxMessageSize !== undefined) {
+    output.push('a=max-message-size:' + sctp.maxMessageSize + '\r\n');
+  }
+  return output.join('');
+};
+
+// Generate a session ID for SDP.
+// https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-20#section-5.2.1
+// recommends using a cryptographically random +ve 64-bit value
+// but right now this should be acceptable and within the right range
+SDPUtils.generateSessionId = function() {
+  return Math.random().toString().substr(2, 21);
+};
+
+// Write boilder plate for start of SDP
+// sessId argument is optional - if not supplied it will
+// be generated randomly
+// sessVersion is optional and defaults to 2
+// sessUser is optional and defaults to 'thisisadapterortc'
+SDPUtils.writeSessionBoilerplate = function(sessId, sessVer, sessUser) {
+  var sessionId;
+  var version = sessVer !== undefined ? sessVer : 2;
+  if (sessId) {
+    sessionId = sessId;
+  } else {
+    sessionId = SDPUtils.generateSessionId();
+  }
+  var user = sessUser || 'thisisadapterortc';
+  // FIXME: sess-id should be an NTP timestamp.
+  return 'v=0\r\n' +
+      'o=' + user + ' ' + sessionId + ' ' + version +
+        ' IN IP4 127.0.0.1\r\n' +
+      's=-\r\n' +
+      't=0 0\r\n';
+};
+
+SDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {
+  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);
+
+  // Map ICE parameters (ufrag, pwd) to SDP.
+  sdp += SDPUtils.writeIceParameters(
+    transceiver.iceGatherer.getLocalParameters());
+
+  // Map DTLS parameters to SDP.
+  sdp += SDPUtils.writeDtlsParameters(
+    transceiver.dtlsTransport.getLocalParameters(),
+    type === 'offer' ? 'actpass' : 'active');
+
+  sdp += 'a=mid:' + transceiver.mid + '\r\n';
+
+  if (transceiver.direction) {
+    sdp += 'a=' + transceiver.direction + '\r\n';
+  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {
+    sdp += 'a=sendrecv\r\n';
+  } else if (transceiver.rtpSender) {
+    sdp += 'a=sendonly\r\n';
+  } else if (transceiver.rtpReceiver) {
+    sdp += 'a=recvonly\r\n';
+  } else {
+    sdp += 'a=inactive\r\n';
+  }
+
+  if (transceiver.rtpSender) {
+    // spec.
+    var msid = 'msid:' + stream.id + ' ' +
+        transceiver.rtpSender.track.id + '\r\n';
+    sdp += 'a=' + msid;
+
+    // for Chrome.
+    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
+        ' ' + msid;
+    if (transceiver.sendEncodingParameters[0].rtx) {
+      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
+          ' ' + msid;
+      sdp += 'a=ssrc-group:FID ' +
+          transceiver.sendEncodingParameters[0].ssrc + ' ' +
+          transceiver.sendEncodingParameters[0].rtx.ssrc +
+          '\r\n';
+    }
+  }
+  // FIXME: this should be written by writeRtpDescription.
+  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
+      ' cname:' + SDPUtils.localCName + '\r\n';
+  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
+    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
+        ' cname:' + SDPUtils.localCName + '\r\n';
+  }
+  return sdp;
+};
+
+// Gets the direction from the mediaSection or the sessionpart.
+SDPUtils.getDirection = function(mediaSection, sessionpart) {
+  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.
+  var lines = SDPUtils.splitLines(mediaSection);
+  for (var i = 0; i < lines.length; i++) {
+    switch (lines[i]) {
+      case 'a=sendrecv':
+      case 'a=sendonly':
+      case 'a=recvonly':
+      case 'a=inactive':
+        return lines[i].substr(2);
+      default:
+        // FIXME: What should happen here?
+    }
+  }
+  if (sessionpart) {
+    return SDPUtils.getDirection(sessionpart);
+  }
+  return 'sendrecv';
+};
+
+SDPUtils.getKind = function(mediaSection) {
+  var lines = SDPUtils.splitLines(mediaSection);
+  var mline = lines[0].split(' ');
+  return mline[0].substr(2);
+};
+
+SDPUtils.isRejected = function(mediaSection) {
+  return mediaSection.split(' ', 2)[1] === '0';
+};
+
+SDPUtils.parseMLine = function(mediaSection) {
+  var lines = SDPUtils.splitLines(mediaSection);
+  var parts = lines[0].substr(2).split(' ');
+  return {
+    kind: parts[0],
+    port: parseInt(parts[1], 10),
+    protocol: parts[2],
+    fmt: parts.slice(3).join(' ')
+  };
+};
+
+SDPUtils.parseOLine = function(mediaSection) {
+  var line = SDPUtils.matchPrefix(mediaSection, 'o=')[0];
+  var parts = line.substr(2).split(' ');
+  return {
+    username: parts[0],
+    sessionId: parts[1],
+    sessionVersion: parseInt(parts[2], 10),
+    netType: parts[3],
+    addressType: parts[4],
+    address: parts[5]
+  };
+};
+
+// a very naive interpretation of a valid SDP.
+SDPUtils.isValidSDP = function(blob) {
+  if (typeof blob !== 'string' || blob.length === 0) {
+    return false;
+  }
+  var lines = SDPUtils.splitLines(blob);
+  for (var i = 0; i < lines.length; i++) {
+    if (lines[i].length < 2 || lines[i].charAt(1) !== '=') {
+      return false;
+    }
+    // TODO: check the modifier a bit more.
+  }
+  return true;
+};
+
+// Expose public methods.
+if (typeof module === 'object') {
+  module.exports = SDPUtils;
+}
+
+},{}]},{},[1])(1)
+});
\ No newline at end of file
diff --git a/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording-debug.js b/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording-debug.js
index f5442579664..49f00e28e2f 100644
--- a/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording-debug.js
+++ b/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording-debug.js
@@ -95,6 +95,7 @@ M.atto_recordrtc.commonmodule = {
     handle_stop: function() {
         // Set source of audio player.
         var blob = new window.Blob(cm.chunks, {type: cm.mediaRecorder.mimeType});
+        cm.player.set('srcObject', null);
         cm.player.set('src', window.URL.createObjectURL(blob));
 
         // Show audio player with controls enabled, and unmute.
diff --git a/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording-min.js b/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording-min.js
index 5f1deb4a6fa..8a16c7eb367 100644
--- a/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording-min.js
+++ b/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording-min.js
@@ -1,2 +1,2 @@
-YUI.add("moodle-atto_recordrtc-recording",function(e,t){M.atto_recordrtc=M.atto_recordrtc||{};var n=M.atto_recordrtc.commonmodule,r=M.atto_recordrtc.abstractmodule;M.atto_recordrtc.commonmodule={editorScope:null,alertWarning:null,alertDanger:null,player:null,playerDOM:null,startStopBtn:null,uploadBtn:null,countdownSeconds:null,countdownTicker:null,recType:null,stream:null,mediaRecorder:null,chunks:null,blobSize:null,maxUploadSize:null,capture_user_media:function(e,t,n){window.navigator.mediaDevices.getUserMedia(e).then(t).catch(n)},handle_data_available:function(e){n.chunks.push(e.data),n.blobSize+=e.data.size,n.blobSize>=n.maxUploadSize&&(window.localStorage.getItem("alerted")?window.localStorage.removeItem("alerted"):(window.localStorage.setItem("alerted","true"),n.startStopBtn.simulate("click"),r.show_alert("nearingmaxsize")),n.chunks.pop())},handle_stop:function(){var e=new window.Blob(n.chunks,{type:n.mediaRecorder.mimeType});n.player.set("src",window.URL.createObjectURL(e)),n.player.set("muted",!1),n.player.set("controls",!0),n.player.ancestor().ancestor().removeClass("hide"),n.uploadBtn.ancestor().ancestor().removeClass("hide"),n.uploadBtn.set("textContent",M.util.get_string("attachrecording","atto_recordrtc")),n.uploadBtn.set("disabled",!1),n.editorScope.getDialogue().centered(),n.uploadBtn.on("click",function(){n.chunks.length===0?r.show_alert("norecordingfound"):(n.uploadBtn.set("disabled",!0),n.upload_to_server(n.recType,function(e,t){e==="ended"?(n.uploadBtn.set("disabled",!1),n.insert_annotation(n.recType,t)):e==="upload-failed"?(n.uploadBtn.set("disabled",!1),n.uploadBtn.set("textContent",M.util.get_string("uploadfailed","atto_recordrtc")+" "+t)):e==="upload-failed-404"?(n.uploadBtn.set("disabled",!1),n.uploadBtn.set("textContent",M.util.get_string("uploadfailed404","atto_recordrtc"))):e==="upload-aborted"?(n.uploadBtn.set("disabled",!1),n.uploadBtn.set("textContent",M.util.get_string("uploadaborted","atto_recordrtc")+" "+t)):n.uploadBtn.set("textContent",e)}))})},start_recording:function(e,t){var i=r.select_rec_options(e);n.mediaRecorder=new window.MediaRecorder(t,i),n.mediaRecorder.ondataavailable=n.handle_data_available,n.mediaRecorder.onstop=n.handle_stop,n.mediaRecorder.start(1e3),n.player.set("muted",!0),n.countdownSeconds=n.editorScope.get("timelimit"),n.countdownSeconds++;var s=M.util.get_string("stoprecording","atto_recordrtc");s+=' (<span id="minutes"></span>:<span id="seconds"></span>)',n.startStopBtn.setHTML(s),n.set_time(),n.countdownTicker=window.setInterval(n.set_time,1e3),n.startStopBtn.set("disabled",!1)},stop_recording:function(e){n.mediaRecorder.stop();var t=e.getTracks();for(var r=0;r<t.length;r++)t[r].stop()},upload_to_server:function(e,t){var r=new window.XMLHttpRequest;r.open("GET",n.player.get("src"),!0),r.responseType="blob",r.onload=function(){if(r.status===200){var i=this.response,s=(Math.random()*1e3).toString().replace(".","");s+=e==="audio"?"-audio.ogg":"-video.webm";var o=new window.FormData,u=n.editorScope.get("host").get("filepickeroptions").link,a=window.Object.keys(u.repositories);o.append("repo_upload_file",i,s),o.append("itemid",u.itemid);for(var f=0;f<a.length;f++)if(u.repositories[a[f]].type==="upload"){o.append("repo_id",u.repositories[a[f]].id);break}o.append("env",u.env),o.append("sesskey",M.cfg.sesskey),o.append("client_id",u.client_id),o.append("savepath","/"),o.append("ctx_id",u.context.id);var l=M.cfg.wwwroot+"/repository/repository_ajax.php?action=upload";n.make_xmlhttprequest(l,o,function(e,n){e==="upload-ended"?t("ended",window.JSON.parse(n).url):t(e)})}},r.send()},make_xmlhttprequest:function(e,t,n){var r=new window.XMLHttpRequest;r.onreadystatechange=function(){r.readyState===4&&r.status===200?n("upload-ended",r.responseText):r.status===404&&n("upload-failed-404")},r.upload.onprogress=function(e){n(Math.round(e.loaded/e.total*100)+"% "+M.util.get_string("uploadprogress","atto_recordrtc"))},r.upload.onerror=function(e){n("upload-failed",e)},r.upload.onabort=function(e){n("upload-aborted",e)},r.open("POST",e),r.send(t)},pad:function(e){var t=e+"";return t.length<2?"0"+t:t},set_time:function(){n.countdownSeconds--,n.startStopBtn.one("span#seconds").set("textContent",n.pad(n.countdownSeconds%60)),n.startStopBtn.one("span#minutes").set("textContent",n.pad(window.parseInt(n.countdownSeconds/60,10))),n.countdownSeconds===0&&n.startStopBtn.simulate("click")},create_annotation:function(e,t){var n="";return e=="audio"?n="<audio controls='true'>":n="<video controls='true'>",n+="<source src='"+t+"'>"+t,e=="audio"?n+="</audio>":n+="</video>",n},insert_annotation:function(e,t){var r=n.create_annotation(e,t);r?n.editorScope.setLink(n.editorScope,r):n.uploadBtn.set("textContent",M.util.get_string("attachrecording","atto_recordrtc"))}},M.atto_recordrtc=M.atto_recordrtc||{};var n=M.atto_recordrtc.commonmodule,r=M.atto_recordrtc.abstractmodule;M.atto_recordrtc.compatcheckmodule={check_has_gum:function(){(!navigator.mediaDevices||!window.MediaRecorder)&&r.show_alert("nowebrtc",function(){n.editorScope.closeDialogue(n.editorScope)})},check_secure:function(){var e=window.location.protocol==="https:"||window.location.host.indexOf("localhost")!==-1;e||n.alertDanger.ancestor().ancestor().removeClass("hide")}},M.atto_recordrtc=M.atto_recordrtc||{};var n=M.atto_recordrtc.commonmodule,r=M.atto_recordrtc.abstractmodule;M.atto_recordrtc.abstractmodule={show_alert:function(t,n){e.use("moodle-core-notification-alert",function(){var e=new M.core.alert({title:M.util.get_string(t+"_title","atto_recordrtc"),message:M.util.get_string(t,"atto_recordrtc")});n&&e.after("complete",n)})},handle_gum_errors:function(e,t){var i=M.util.get_string("recordingfailed","atto_recordrtc"),s=function(){t.onMediaStopped(i)},o="gum"+e.name.replace("Error","").toLowerCase();o!=="gumsecurity"?r.show_alert(o,s):r.show_alert(o,function(){n.editorScope.closeDialogue(n.editorScope)})},select_rec_options:function(e){var t,r;e==="audio"?(t=["audio/webm;codecs=opus","audio/ogg;codecs=opus"
-],r={audioBitsPerSecond:window.parseInt(n.editorScope.get("audiobitrate"))}):(t=["video/webm;codecs=vp9,opus","video/webm;codecs=h264,opus","video/webm;codecs=vp8,opus"],r={audioBitsPerSecond:window.parseInt(n.editorScope.get("audiobitrate")),videoBitsPerSecond:window.parseInt(n.editorScope.get("videobitrate"))});var i=t.filter(function(e){return window.MediaRecorder.isTypeSupported(e)});return i.length!==0&&(r.mimeType=i[0]),r}},M.atto_recordrtc=M.atto_recordrtc||{};var n=M.atto_recordrtc.commonmodule,r=M.atto_recordrtc.abstractmodule,i=M.atto_recordrtc.compatcheckmodule;M.atto_recordrtc.audiomodule={init:function(t){n.editorScope=t,n.alertWarning=e.one("div#alert-warning"),n.alertDanger=e.one("div#alert-danger"),n.player=e.one("audio#player"),n.playerDOM=document.querySelector("audio#player"),n.startStopBtn=e.one("button#start-stop"),n.uploadBtn=e.one("button#upload"),n.recType="audio",n.maxUploadSize=t.get("maxrecsize"),i.check_has_gum(),i.check_secure(),n.startStopBtn.on("click",function(){n.startStopBtn.set("disabled",!0);if(n.startStopBtn.get("textContent")===M.util.get_string("startrecording","atto_recordrtc")||n.startStopBtn.get("textContent")===M.util.get_string("recordagain","atto_recordrtc")||n.startStopBtn.get("textContent")===M.util.get_string("recordingfailed","atto_recordrtc")){n.player.ancestor().ancestor().addClass("hide"),n.uploadBtn.ancestor().ancestor().addClass("hide"),n.startStopBtn.replaceClass("btn-outline-danger","btn-danger"),n.chunks=[],n.blobSize=0,n.uploadBtn.detach("click");var e={onMediaCaptured:function(e){n.stream=e,n.start_recording(n.recType,n.stream)},onMediaStopped:function(e){n.startStopBtn.set("textContent",e),n.startStopBtn.set("disabled",!1),n.startStopBtn.replaceClass("btn-danger","btn-outline-danger")},onMediaCapturingFailed:function(t){r.handle_gum_errors(t,e)}};M.atto_recordrtc.audiomodule.capture_audio(e)}else window.clearInterval(n.countdownTicker),window.setTimeout(function(){n.startStopBtn.set("disabled",!1)},1e3),n.stop_recording(n.stream),n.startStopBtn.set("textContent",M.util.get_string("recordagain","atto_recordrtc")),n.startStopBtn.replaceClass("btn-danger","btn-outline-danger");n.editorScope.getDialogue().centered()})},capture_audio:function(e){n.capture_user_media({audio:!0},function(t){n.playerDOM.srcObject=t,e.onMediaCaptured(t)},function(t){e.onMediaCapturingFailed(t)})}},M.atto_recordrtc=M.atto_recordrtc||{};var n=M.atto_recordrtc.commonmodule,r=M.atto_recordrtc.abstractmodule,i=M.atto_recordrtc.compatcheckmodule;M.atto_recordrtc.videomodule={init:function(t){n.editorScope=t,n.alertWarning=e.one("div#alert-warning"),n.alertDanger=e.one("div#alert-danger"),n.player=e.one("video#player"),n.playerDOM=document.querySelector("video#player"),n.startStopBtn=e.one("button#start-stop"),n.uploadBtn=e.one("button#upload"),n.recType="video",n.maxUploadSize=t.get("maxrecsize"),i.check_has_gum(),i.check_secure(),n.startStopBtn.on("click",function(){n.startStopBtn.set("disabled",!0);if(n.startStopBtn.get("textContent")===M.util.get_string("startrecording","atto_recordrtc")||n.startStopBtn.get("textContent")===M.util.get_string("recordagain","atto_recordrtc")||n.startStopBtn.get("textContent")===M.util.get_string("recordingfailed","atto_recordrtc")){n.uploadBtn.ancestor().ancestor().addClass("hide"),n.startStopBtn.replaceClass("btn-outline-danger","btn-danger"),n.chunks=[],n.blobSize=0,n.uploadBtn.detach("click");var e={onMediaCaptured:function(e){n.stream=e,n.start_recording(n.recType,n.stream)},onMediaStopped:function(e){n.startStopBtn.set("textContent",e),n.startStopBtn.set("disabled",!1),n.startStopBtn.replaceClass("btn-danger","btn-outline-danger")},onMediaCapturingFailed:function(t){r.handle_gum_errors(t,e)}};n.player.ancestor().ancestor().removeClass("hide"),n.player.set("controls",!1),M.atto_recordrtc.videomodule.capture_audio_video(e)}else window.clearInterval(n.countdownTicker),window.setTimeout(function(){n.startStopBtn.set("disabled",!1)},1e3),n.stop_recording(n.stream),n.startStopBtn.set("textContent",M.util.get_string("recordagain","atto_recordrtc")),n.startStopBtn.replaceClass("btn-danger","btn-outline-danger");n.editorScope.getDialogue().centered()})},capture_audio_video:function(e){n.capture_user_media({audio:!0,video:{width:{ideal:640},height:{ideal:480}}},function(t){n.playerDOM.srcObject=t,n.playerDOM.play(),e.onMediaCaptured(t)},function(t){e.onMediaCapturingFailed(t)})}}},"@VERSION@",{requires:["moodle-atto_recordrtc-button"]});
+YUI.add("moodle-atto_recordrtc-recording",function(e,t){M.atto_recordrtc=M.atto_recordrtc||{};var n=M.atto_recordrtc.commonmodule,r=M.atto_recordrtc.abstractmodule;M.atto_recordrtc.commonmodule={editorScope:null,alertWarning:null,alertDanger:null,player:null,playerDOM:null,startStopBtn:null,uploadBtn:null,countdownSeconds:null,countdownTicker:null,recType:null,stream:null,mediaRecorder:null,chunks:null,blobSize:null,maxUploadSize:null,capture_user_media:function(e,t,n){window.navigator.mediaDevices.getUserMedia(e).then(t).catch(n)},handle_data_available:function(e){n.chunks.push(e.data),n.blobSize+=e.data.size,n.blobSize>=n.maxUploadSize&&(window.localStorage.getItem("alerted")?window.localStorage.removeItem("alerted"):(window.localStorage.setItem("alerted","true"),n.startStopBtn.simulate("click"),r.show_alert("nearingmaxsize")),n.chunks.pop())},handle_stop:function(){var e=new window.Blob(n.chunks,{type:n.mediaRecorder.mimeType});n.player.set("srcObject",null),n.player.set("src",window.URL.createObjectURL(e)),n.player.set("muted",!1),n.player.set("controls",!0),n.player.ancestor().ancestor().removeClass("hide"),n.uploadBtn.ancestor().ancestor().removeClass("hide"),n.uploadBtn.set("textContent",M.util.get_string("attachrecording","atto_recordrtc")),n.uploadBtn.set("disabled",!1),n.editorScope.getDialogue().centered(),n.uploadBtn.on("click",function(){n.chunks.length===0?r.show_alert("norecordingfound"):(n.uploadBtn.set("disabled",!0),n.upload_to_server(n.recType,function(e,t){e==="ended"?(n.uploadBtn.set("disabled",!1),n.insert_annotation(n.recType,t)):e==="upload-failed"?(n.uploadBtn.set("disabled",!1),n.uploadBtn.set("textContent",M.util.get_string("uploadfailed","atto_recordrtc")+" "+t)):e==="upload-failed-404"?(n.uploadBtn.set("disabled",!1),n.uploadBtn.set("textContent",M.util.get_string("uploadfailed404","atto_recordrtc"))):e==="upload-aborted"?(n.uploadBtn.set("disabled",!1),n.uploadBtn.set("textContent",M.util.get_string("uploadaborted","atto_recordrtc")+" "+t)):n.uploadBtn.set("textContent",e)}))})},start_recording:function(e,t){var i=r.select_rec_options(e);n.mediaRecorder=new window.MediaRecorder(t,i),n.mediaRecorder.ondataavailable=n.handle_data_available,n.mediaRecorder.onstop=n.handle_stop,n.mediaRecorder.start(1e3),n.player.set("muted",!0),n.countdownSeconds=n.editorScope.get("timelimit"),n.countdownSeconds++;var s=M.util.get_string("stoprecording","atto_recordrtc");s+=' (<span id="minutes"></span>:<span id="seconds"></span>)',n.startStopBtn.setHTML(s),n.set_time(),n.countdownTicker=window.setInterval(n.set_time,1e3),n.startStopBtn.set("disabled",!1)},stop_recording:function(e){n.mediaRecorder.stop();var t=e.getTracks();for(var r=0;r<t.length;r++)t[r].stop()},upload_to_server:function(e,t){var r=new window.XMLHttpRequest;r.open("GET",n.player.get("src"),!0),r.responseType="blob",r.onload=function(){if(r.status===200){var i=this.response,s=(Math.random()*1e3).toString().replace(".","");s+=e==="audio"?"-audio.ogg":"-video.webm";var o=new window.FormData,u=n.editorScope.get("host").get("filepickeroptions").link,a=window.Object.keys(u.repositories);o.append("repo_upload_file",i,s),o.append("itemid",u.itemid);for(var f=0;f<a.length;f++)if(u.repositories[a[f]].type==="upload"){o.append("repo_id",u.repositories[a[f]].id);break}o.append("env",u.env),o.append("sesskey",M.cfg.sesskey),o.append("client_id",u.client_id),o.append("savepath","/"),o.append("ctx_id",u.context.id);var l=M.cfg.wwwroot+"/repository/repository_ajax.php?action=upload";n.make_xmlhttprequest(l,o,function(e,n){e==="upload-ended"?t("ended",window.JSON.parse(n).url):t(e)})}},r.send()},make_xmlhttprequest:function(e,t,n){var r=new window.XMLHttpRequest;r.onreadystatechange=function(){r.readyState===4&&r.status===200?n("upload-ended",r.responseText):r.status===404&&n("upload-failed-404")},r.upload.onprogress=function(e){n(Math.round(e.loaded/e.total*100)+"% "+M.util.get_string("uploadprogress","atto_recordrtc"))},r.upload.onerror=function(e){n("upload-failed",e)},r.upload.onabort=function(e){n("upload-aborted",e)},r.open("POST",e),r.send(t)},pad:function(e){var t=e+"";return t.length<2?"0"+t:t},set_time:function(){n.countdownSeconds--,n.startStopBtn.one("span#seconds").set("textContent",n.pad(n.countdownSeconds%60)),n.startStopBtn.one("span#minutes").set("textContent",n.pad(window.parseInt(n.countdownSeconds/60,10))),n.countdownSeconds===0&&n.startStopBtn.simulate("click")},create_annotation:function(e,t){var n="";return e=="audio"?n="<audio controls='true'>":n="<video controls='true'>",n+="<source src='"+t+"'>"+t,e=="audio"?n+="</audio>":n+="</video>",n},insert_annotation:function(e,t){var r=n.create_annotation(e,t);r?n.editorScope.setLink(n.editorScope,r):n.uploadBtn.set("textContent",M.util.get_string("attachrecording","atto_recordrtc"))}},M.atto_recordrtc=M.atto_recordrtc||{};var n=M.atto_recordrtc.commonmodule,r=M.atto_recordrtc.abstractmodule;M.atto_recordrtc.compatcheckmodule={check_has_gum:function(){(!navigator.mediaDevices||!window.MediaRecorder)&&r.show_alert("nowebrtc",function(){n.editorScope.closeDialogue(n.editorScope)})},check_secure:function(){var e=window.location.protocol==="https:"||window.location.host.indexOf("localhost")!==-1;e||n.alertDanger.ancestor().ancestor().removeClass("hide")}},M.atto_recordrtc=M.atto_recordrtc||{};var n=M.atto_recordrtc.commonmodule,r=M.atto_recordrtc.abstractmodule;M.atto_recordrtc.abstractmodule={show_alert:function(t,n){e.use("moodle-core-notification-alert",function(){var e=new M.core.alert({title:M.util.get_string(t+"_title","atto_recordrtc"),message:M.util.get_string(t,"atto_recordrtc")});n&&e.after("complete",n)})},handle_gum_errors:function(e,t){var i=M.util.get_string("recordingfailed","atto_recordrtc"),s=function(){t.onMediaStopped(i)},o="gum"+e.name.replace("Error","").toLowerCase();o!=="gumsecurity"?r.show_alert(o,s):r.show_alert(o,function(){n.editorScope.closeDialogue(n.editorScope)})},select_rec_options:function(e){var t,r;e==="audio"?(t=["audio/webm;codecs=opus"
+,"audio/ogg;codecs=opus"],r={audioBitsPerSecond:window.parseInt(n.editorScope.get("audiobitrate"))}):(t=["video/webm;codecs=vp9,opus","video/webm;codecs=h264,opus","video/webm;codecs=vp8,opus"],r={audioBitsPerSecond:window.parseInt(n.editorScope.get("audiobitrate")),videoBitsPerSecond:window.parseInt(n.editorScope.get("videobitrate"))});var i=t.filter(function(e){return window.MediaRecorder.isTypeSupported(e)});return i.length!==0&&(r.mimeType=i[0]),r}},M.atto_recordrtc=M.atto_recordrtc||{};var n=M.atto_recordrtc.commonmodule,r=M.atto_recordrtc.abstractmodule,i=M.atto_recordrtc.compatcheckmodule;M.atto_recordrtc.audiomodule={init:function(t){n.editorScope=t,n.alertWarning=e.one("div#alert-warning"),n.alertDanger=e.one("div#alert-danger"),n.player=e.one("audio#player"),n.playerDOM=document.querySelector("audio#player"),n.startStopBtn=e.one("button#start-stop"),n.uploadBtn=e.one("button#upload"),n.recType="audio",n.maxUploadSize=t.get("maxrecsize"),i.check_has_gum(),i.check_secure(),n.startStopBtn.on("click",function(){n.startStopBtn.set("disabled",!0);if(n.startStopBtn.get("textContent")===M.util.get_string("startrecording","atto_recordrtc")||n.startStopBtn.get("textContent")===M.util.get_string("recordagain","atto_recordrtc")||n.startStopBtn.get("textContent")===M.util.get_string("recordingfailed","atto_recordrtc")){n.player.ancestor().ancestor().addClass("hide"),n.uploadBtn.ancestor().ancestor().addClass("hide"),n.startStopBtn.replaceClass("btn-outline-danger","btn-danger"),n.chunks=[],n.blobSize=0,n.uploadBtn.detach("click");var e={onMediaCaptured:function(e){n.stream=e,n.start_recording(n.recType,n.stream)},onMediaStopped:function(e){n.startStopBtn.set("textContent",e),n.startStopBtn.set("disabled",!1),n.startStopBtn.replaceClass("btn-danger","btn-outline-danger")},onMediaCapturingFailed:function(t){r.handle_gum_errors(t,e)}};M.atto_recordrtc.audiomodule.capture_audio(e)}else window.clearInterval(n.countdownTicker),window.setTimeout(function(){n.startStopBtn.set("disabled",!1)},1e3),n.stop_recording(n.stream),n.startStopBtn.set("textContent",M.util.get_string("recordagain","atto_recordrtc")),n.startStopBtn.replaceClass("btn-danger","btn-outline-danger");n.editorScope.getDialogue().centered()})},capture_audio:function(e){n.capture_user_media({audio:!0},function(t){n.playerDOM.srcObject=t,e.onMediaCaptured(t)},function(t){e.onMediaCapturingFailed(t)})}},M.atto_recordrtc=M.atto_recordrtc||{};var n=M.atto_recordrtc.commonmodule,r=M.atto_recordrtc.abstractmodule,i=M.atto_recordrtc.compatcheckmodule;M.atto_recordrtc.videomodule={init:function(t){n.editorScope=t,n.alertWarning=e.one("div#alert-warning"),n.alertDanger=e.one("div#alert-danger"),n.player=e.one("video#player"),n.playerDOM=document.querySelector("video#player"),n.startStopBtn=e.one("button#start-stop"),n.uploadBtn=e.one("button#upload"),n.recType="video",n.maxUploadSize=t.get("maxrecsize"),i.check_has_gum(),i.check_secure(),n.startStopBtn.on("click",function(){n.startStopBtn.set("disabled",!0);if(n.startStopBtn.get("textContent")===M.util.get_string("startrecording","atto_recordrtc")||n.startStopBtn.get("textContent")===M.util.get_string("recordagain","atto_recordrtc")||n.startStopBtn.get("textContent")===M.util.get_string("recordingfailed","atto_recordrtc")){n.uploadBtn.ancestor().ancestor().addClass("hide"),n.startStopBtn.replaceClass("btn-outline-danger","btn-danger"),n.chunks=[],n.blobSize=0,n.uploadBtn.detach("click");var e={onMediaCaptured:function(e){n.stream=e,n.start_recording(n.recType,n.stream)},onMediaStopped:function(e){n.startStopBtn.set("textContent",e),n.startStopBtn.set("disabled",!1),n.startStopBtn.replaceClass("btn-danger","btn-outline-danger")},onMediaCapturingFailed:function(t){r.handle_gum_errors(t,e)}};n.player.ancestor().ancestor().removeClass("hide"),n.player.set("controls",!1),M.atto_recordrtc.videomodule.capture_audio_video(e)}else window.clearInterval(n.countdownTicker),window.setTimeout(function(){n.startStopBtn.set("disabled",!1)},1e3),n.stop_recording(n.stream),n.startStopBtn.set("textContent",M.util.get_string("recordagain","atto_recordrtc")),n.startStopBtn.replaceClass("btn-danger","btn-outline-danger");n.editorScope.getDialogue().centered()})},capture_audio_video:function(e){n.capture_user_media({audio:!0,video:{width:{ideal:640},height:{ideal:480}}},function(t){n.playerDOM.srcObject=t,n.playerDOM.play(),e.onMediaCaptured(t)},function(t){e.onMediaCapturingFailed(t)})}}},"@VERSION@",{requires:["moodle-atto_recordrtc-button"]});
diff --git a/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording.js b/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording.js
index f5442579664..49f00e28e2f 100644
--- a/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording.js
+++ b/lib/editor/atto/plugins/recordrtc/yui/build/moodle-atto_recordrtc-recording/moodle-atto_recordrtc-recording.js
@@ -95,6 +95,7 @@ M.atto_recordrtc.commonmodule = {
     handle_stop: function() {
         // Set source of audio player.
         var blob = new window.Blob(cm.chunks, {type: cm.mediaRecorder.mimeType});
+        cm.player.set('srcObject', null);
         cm.player.set('src', window.URL.createObjectURL(blob));
 
         // Show audio player with controls enabled, and unmute.
diff --git a/lib/editor/atto/plugins/recordrtc/yui/src/recording/js/commonmodule.js b/lib/editor/atto/plugins/recordrtc/yui/src/recording/js/commonmodule.js
index 54c41d5d01b..0b10a278733 100644
--- a/lib/editor/atto/plugins/recordrtc/yui/src/recording/js/commonmodule.js
+++ b/lib/editor/atto/plugins/recordrtc/yui/src/recording/js/commonmodule.js
@@ -93,6 +93,7 @@ M.atto_recordrtc.commonmodule = {
     handle_stop: function() {
         // Set source of audio player.
         var blob = new window.Blob(cm.chunks, {type: cm.mediaRecorder.mimeType});
+        cm.player.set('srcObject', null);
         cm.player.set('src', window.URL.createObjectURL(blob));
 
         // Show audio player with controls enabled, and unmute.
diff --git a/lib/thirdpartylibs.xml b/lib/thirdpartylibs.xml
index 3e71277f052..423b86db50a 100644
--- a/lib/thirdpartylibs.xml
+++ b/lib/thirdpartylibs.xml
@@ -273,7 +273,7 @@
     <location>amd/src/adapter.js</location>
     <name>WebRTC adapter</name>
     <license>BSD</license>
-    <version>6.4.0</version>
+    <version>7.3.0</version>
     <licenseversion>3-Clause</licenseversion>
   </library>
   <library>