diff --git a/lib/amd/build/adapter.min.js b/lib/amd/build/adapter.min.js
index 1c24ad2fb54..2d588c1efa7 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 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 d=e("sdp");function r(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 a(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 n(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 i(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 o(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 s(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 c(t,r){r.addTrack(t);r.dispatchEvent(new e.MediaStreamTrackEvent("addtrack",{track:t}))}function p(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 l=function(r){var n=this,o=document.createDocumentFragment();["addEventListener","removeEventListener","dispatchEvent"].forEach(function(e){n[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 s("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=a(r.iceServers||[],t);this._iceGatherers=[];if(r.iceCandidatePoolSize){for(var c=r.iceCandidatePoolSize;0<c;c--){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};l.prototype.onicecandidate=null;l.prototype.onaddstream=null;l.prototype.ontrack=null;l.prototype.onremovestream=null;l.prototype.onsignalingstatechange=null;l.prototype.oniceconnectionstatechange=null;l.prototype.onconnectionstatechange=null;l.prototype.onicegatheringstatechange=null;l.prototype.onnegotiationneeded=null;l.prototype.ondatachannel=null;l.prototype._dispatchEvent=function(e,t){if(this._isClosed){return}this.dispatchEvent(t);if("function"==typeof this["on"+e]){this["on"+e](t)}};l.prototype._emitGatheringStateChange=function(){var e=new Event("icegatheringstatechange");this._dispatchEvent("icegatheringstatechange",e)};l.prototype.getConfiguration=function(){return this._config};l.prototype.getLocalStreams=function(){return this.localStreams};l.prototype.getRemoteStreams=function(){return this.remoteStreams};l.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};l.prototype.addTrack=function(t,r){if(this._isClosed){throw s("InvalidStateError","Attempted to call addTrack on a closed peerconnection.")}var a=this.transceivers.find(function(e){return e.track===t});if(a){throw s("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};l.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)})}};l.prototype.removeTrack=function(r){if(this._isClosed){throw s("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 s("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()};l.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)}})};l.prototype.getSenders=function(){return this.transceivers.filter(function(e){return!!e.rtpSender}).map(function(e){return e.rtpSender})};l.prototype.getReceivers=function(){return this.transceivers.filter(function(e){return!!e.rtpReceiver}).map(function(e){return e.rtpReceiver})};l.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};l.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)};l.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}};l.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}};l.prototype._transceive=function(e,r,a){var i=n(e.localCapabilities,e.remoteCapabilities);if(r&&e.rtpSender){i.encodings=e.sendEncodingParameters;i.rtcp={cname:d.localCName,compound:e.rtcpParameters.compound};if(e.recvEncodingParameters.length){i.rtcp.ssrc=e.recvEncodingParameters[0].ssrc}e.rtpSender.send(i)}if(a&&e.rtpReceiver&&0<i.codecs.length){if("video"===e.kind&&e.recvEncodingParameters&&15019>t){e.recvEncodingParameters.forEach(function(e){delete e.rtx})}if(e.recvEncodingParameters.length){i.encodings=e.recvEncodingParameters}else{i.encodings=[{}]}i.rtcp={compound:e.rtcpParameters.compound};if(e.rtcpParameters.cname){i.rtcp.cname=e.rtcpParameters.cname}if(e.sendEncodingParameters.length){i.rtcp.ssrc=e.sendEncodingParameters[0].ssrc}e.rtpReceiver.receive(i)}};l.prototype.setLocalDescription=function(e){var t=this;if(-1===["offer","answer"].indexOf(e.type)){return Promise.reject(s("TypeError","Unsupported type \""+e.type+"\""))}if(!i("setLocalDescription",e.type,t.signalingState)||t._isClosed){return Promise.reject(s("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 o=0<d.matchPrefix(a,"a=ice-lite").length;r.forEach(function(e,r){var i=t.transceivers[r],s=i.iceGatherer,c=i.iceTransport,p=i.dtlsTransport,m=i.localCapabilities,l=i.remoteCapabilities,f=d.isRejected(e)&&0===d.matchPrefix(e,"a=bundle-only").length;if(!f&&!i.rejected){var g=d.getIceParameters(e,a),h=d.getDtlsParameters(e,a);if(o){h.role="server"}if(!t.usingBundle||0===r){t._gather(i.mid,r);if("new"===c.state){c.start(s,g,o?"controlling":"controlled")}if("new"===p.state){p.start(h)}}var v=n(m,l);t._transceive(i,0<v.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()};l.prototype.setRemoteDescription=function(r){var a=this;if(-1===["offer","answer"].indexOf(r.type)){return Promise.reject(s("TypeError","Unsupported type \""+r.type+"\""))}if(!i("setRemoteDescription",r.type,a.signalingState)||a._isClosed){return Promise.reject(s("InvalidStateError","Can not set remote "+r.type+" in state "+a.signalingState))}var n={};a.remoteStreams.forEach(function(e){n[e.id]=e});var l=[],f=d.splitSections(r.sdp),g=f.shift(),h=0<d.matchPrefix(g,"a=ice-lite").length,v=0<d.matchPrefix(g,"a=group:BUNDLE ").length;a.usingBundle=v;var C=d.matchPrefix(g,"a=ice-options:")[0];if(C){a.canTrickleIceCandidates=0<=C.substr(14).split(" ").indexOf("trickle")}else{a.canTrickleIceCandidates=!1}f.forEach(function(i,s){var m=d.splitLines(i),f=d.getKind(i),C=d.isRejected(i)&&0===d.matchPrefix(i,"a=bundle-only").length,u=m[0].substr(2).split(" ")[2],y=d.getDirection(i,g),T=d.parseMsid(i),S=d.getMid(i)||d.generateIdentifier();if("application"===f&&"DTLS/SCTP"===u||C){a.transceivers[s]={mid:S,kind:f,rejected:!0};return}if(!C&&a.transceivers[s]&&a.transceivers[s].rejected){a.transceivers[s]=a._createTransceiver(f,!0)}var R,P,E,k,b,_,x,L,M,I=d.parseRtpParameters(i),w,D;if(!C){w=d.getIceParameters(i,g);D=d.getDtlsParameters(i,g);D.role="client"}x=d.parseRtpEncodingParameters(i);var j=d.parseRtcpParameters(i),O=0<d.matchPrefix(i,"a=end-of-candidates",g).length,U=d.matchPrefix(i,"a=candidate:").map(function(e){return d.parseCandidate(e)}).filter(function(e){return 1===e.component});if(("offer"===r.type||"answer"===r.type)&&!C&&v&&0<s&&a.transceivers[s]){a._disposeIceAndDtlsTransports(s);a.transceivers[s].iceGatherer=a.transceivers[0].iceGatherer;a.transceivers[s].iceTransport=a.transceivers[0].iceTransport;a.transceivers[s].dtlsTransport=a.transceivers[0].dtlsTransport;if(a.transceivers[s].rtpSender){a.transceivers[s].rtpSender.setTransport(a.transceivers[0].dtlsTransport)}if(a.transceivers[s].rtpReceiver){a.transceivers[s].rtpReceiver.setTransport(a.transceivers[0].dtlsTransport)}}if("offer"===r.type&&!C){R=a.transceivers[s]||a._createTransceiver(f);R.mid=S;if(!R.iceGatherer){R.iceGatherer=a._createIceGatherer(s,v)}if(U.length&&"new"===R.iceTransport.state){if(O&&(!v||0===s)){R.iceTransport.setRemoteCandidates(U)}else{U.forEach(function(e){o(R.iceTransport,e)})}}L=e.RTCRtpReceiver.getCapabilities(f);if(15019>t){L.codecs=L.codecs.filter(function(e){return"rtx"!==e.name})}_=R.sendEncodingParameters||[{ssrc:1001*(2*s+2)}];var A=!1;if("sendrecv"===y||"sendonly"===y){A=!R.rtpReceiver;b=R.rtpReceiver||new e.RTCRtpReceiver(R.dtlsTransport,f);if(A){var G;M=b.track;if(T&&"-"===T.stream){}else if(T){if(!n[T.stream]){n[T.stream]=new e.MediaStream;Object.defineProperty(n[T.stream],"id",{get:function get(){return T.stream}})}Object.defineProperty(M,"id",{get:function get(){return T.track}});G=n[T.stream]}else{if(!n.default){n.default=new e.MediaStream}G=n.default}if(G){c(M,G);R.associatedRemoteMediaStreams.push(G)}l.push([M,b,G])}}else if(R.rtpReceiver&&R.rtpReceiver.track){R.associatedRemoteMediaStreams.forEach(function(e){var t=e.getTracks().find(function(e){return e.id===R.rtpReceiver.track.id});if(t){p(t,e)}});R.associatedRemoteMediaStreams=[]}R.localCapabilities=L;R.remoteCapabilities=I;R.rtpReceiver=b;R.rtcpParameters=j;R.sendEncodingParameters=_;R.recvEncodingParameters=x;a._transceive(a.transceivers[s],!1,A)}else if("answer"===r.type&&!C){R=a.transceivers[s];P=R.iceGatherer;E=R.iceTransport;k=R.dtlsTransport;b=R.rtpReceiver;_=R.sendEncodingParameters;L=R.localCapabilities;a.transceivers[s].recvEncodingParameters=x;a.transceivers[s].remoteCapabilities=I;a.transceivers[s].rtcpParameters=j;if(U.length&&"new"===E.state){if((h||O)&&(!v||0===s)){E.setRemoteCandidates(U)}else{U.forEach(function(e){o(R.iceTransport,e)})}}if(!v||0===s){if("new"===E.state){E.start(P,w,"controlling")}if("new"===k.state){k.start(D)}}a._transceive(R,"sendrecv"===y||"recvonly"===y,"sendrecv"===y||"sendonly"===y);if(b&&("sendrecv"===y||"sendonly"===y)){M=b.track;if(T){if(!n[T.stream]){n[T.stream]=new e.MediaStream}c(M,n[T.stream]);l.push([M,b,n[T.stream]])}else{if(!n.default){n.default=new e.MediaStream}c(M,n.default);l.push([M,b,n.default])}}else{delete R.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)})}l.forEach(function(e){var t=e[0],n=e[1];if(r.id!==e[2].id){return}m(a,t,n,[r])})}});l.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()};l.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")};l.prototype._updateSignalingState=function(e){this.signalingState=e;var t=new Event("signalingstatechange");this._dispatchEvent("signalingstatechange",t)};l.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)};l.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)}};l.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)}};l.prototype.createOffer=function(){var a=this;if(a._isClosed){return Promise.reject(s("InvalidStateError","Can not call createOffer after close"))}var n=a.transceivers.filter(function(e){return"audio"===e.kind}).length,i=a.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}}}a.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){a._createTransceiver("audio");n--}if(0<i){a._createTransceiver("video");i--}}var c=d.writeSessionBoilerplate(a._sdpSessionId,a._sdpSessionVersion++);a.transceivers.forEach(function(r,n){var i=r.track,o=r.kind,s=r.mid||d.generateIdentifier();r.mid=s;if(!r.iceGatherer){r.iceGatherer=a._createIceGatherer(n,a.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(r.remoteCapabilities&&r.remoteCapabilities.codecs){r.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=r.remoteCapabilities&&r.remoteCapabilities.headerExtensions||[];t.forEach(function(t){if(e.uri===t.uri){e.id=t.id}})});var p=r.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(r.wantReceive){r.rtpReceiver=new e.RTCRtpReceiver(r.dtlsTransport,o)}r.localCapabilities=c;r.sendEncodingParameters=p});if("max-compat"!==a._config.bundlePolicy){c+="a=group:BUNDLE "+a.transceivers.map(function(e){return e.mid}).join(" ")+"\r\n"}c+="a=ice-options:trickle\r\n";a.transceivers.forEach(function(e,t){c+=r(e,e.localCapabilities,"offer",e.stream,a._dtlsRole);c+="a=rtcp-rsize\r\n";if(e.iceGatherer&&"new"!==a.iceGatheringState&&(0===t||!a.usingBundle)){e.iceGatherer.getLocalCandidates().forEach(function(e){e.component=1;c+="a="+d.writeCandidate(e)+"\r\n"});if("completed"===e.iceGatherer.state){c+="a=end-of-candidates\r\n"}}});var p=new e.RTCSessionDescription({type:"offer",sdp:c});return Promise.resolve(p)};l.prototype.createAnswer=function(){var a=this;if(a._isClosed){return Promise.reject(s("InvalidStateError","Can not call createAnswer after close"))}if(!("have-remote-offer"===a.signalingState||"have-local-pranswer"===a.signalingState)){return Promise.reject(s("InvalidStateError","Can not call createAnswer in signalingState "+a.signalingState))}var i=d.writeSessionBoilerplate(a._sdpSessionId,a._sdpSessionVersion++);if(a.usingBundle){i+="a=group:BUNDLE "+a.transceivers.map(function(e){return e.mid}).join(" ")+"\r\n"}var o=d.getMediaSections(a.remoteDescription.sdp).length;a.transceivers.forEach(function(e,s){if(s+1>o){return}if(e.rejected){if("application"===e.kind){i+="m=application 0 DTLS/SCTP 5000\r\n"}else if("audio"===e.kind){i+="m=audio 0 UDP/TLS/RTP/SAVPF 0\r\na=rtpmap:0 PCMU/8000\r\n"}else if("video"===e.kind){i+="m=video 0 UDP/TLS/RTP/SAVPF 120\r\na=rtpmap:120 VP8/90000\r\n"}i+="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=n(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}i+=r(e,c,"answer",e.stream,a._dtlsRole);if(e.rtcpParameters&&e.rtcpParameters.reducedSize){i+="a=rtcp-rsize\r\n"}});var c=new e.RTCSessionDescription({type:"answer",sdp:i});return Promise.resolve(c)};l.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(s("InvalidStateError","Can not add ICE candidate without a remote description"))}else if(!e||""===e.candidate){for(var c=0;c<t.transceivers.length;c++){if(t.transceivers[c].rejected){continue}t.transceivers[c].iceTransport.addRemoteCandidate({});r=d.getMediaSections(t.remoteDescription.sdp);r[c]+="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 f=0<Object.keys(e.candidate).length?d.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&&l.iceTransport!==t.transceivers[0].iceTransport){if(!o(l.iceTransport,f)){return n(s("OperationError","Can not add ICE candidate"))}}var g=e.candidate.trim();if(0===g.indexOf("a=")){g=g.substr(2)}r=d.getMediaSections(t.remoteDescription.sdp);r[p]+="a="+(f.type?g:"end-of-candidates")+"\r\n";t.remoteDescription.sdp=d.getDescription(t.remoteDescription.sdp)+r.join("")}else{return n(s("OperationError","Can not add ICE candidate"))}}a()})};l.prototype.getStats=function(){var e=[];this.transceivers.forEach(function(t){["rtpSender","rtpReceiver","iceGatherer","iceTransport","dtlsTransport"].forEach(function(r){if(t[r]){e.push(t[r].getStats())}})});var t=function(e){return{inboundrtp:"inbound-rtp",outboundrtp:"outbound-rtp",candidatepair:"candidate-pair",localcandidate:"local-candidate",remotecandidate:"remote-candidate"}[e.type]||e.type};return new Promise(function(r){var a=new Map;Promise.all(e).then(function(e){e.forEach(function(e){Object.keys(e).forEach(function(r){e[r].type=t(e[r]);a.set(r,e[r])})});r(a)})})};var f=["createOffer","createAnswer"];f.forEach(function(e){var t=l.prototype[e];l.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)}});f=["setLocalDescription","setRemoteDescription","addIceCandidate"];f.forEach(function(e){var t=l.prototype[e];l.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=l.prototype[e];l.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 l}},{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],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.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.numChannels=3===t.length?parseInt(t[2],10):1;return r};r.writeRtpMap=function(e){var t=e.payloadType;if(e.preferredPayloadType!==void 0){t=e.preferredPayloadType}return"a=rtpmap:"+t+" "+e.name+"/"+e.clockRate+(1!==e.numChannels?"/"+e.numChannels:"")+"\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){a.push(t+"="+e.parameters[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.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";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.split(" ");t.shift();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),rtx:{ssrc:d}};t.push(r);if(n){r=JSON.parse(JSON.stringify(r));r.fec={ssrc:d,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){var a,n=t!==void 0?t:2;if(e){a=e}else{a=r.generateSessionId()}return"v=0\r\no=thisisadapterortc "+a+" "+n+" 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]}};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,d=r.detectBrowser(n),c=e("./chrome/chrome_shim")||null,p=e("./edge/edge_shim")||null,m=e("./firefox/firefox_shim")||null,l=e("./safari/safari_shim")||null,f=e("./common_shim")||null,g={browserDetails:d,commonShim:f,extractVersion:r.extractVersion,disableLog:r.disableLog,disableWarnings:r.disableWarnings};switch(d.browser){case"chrome":if(!c||!c.shimPeerConnection||!i.shimChrome){s("Chrome shim is not included in this adapter release.");return g}s("adapter.js shimming chrome.");g.browserShim=c;f.shimCreateObjectURL(n);c.shimGetUserMedia(n);c.shimMediaStream(n);c.shimSourceObject(n);c.shimPeerConnection(n);c.shimOnTrack(n);c.shimAddTrackRemoveTrack(n);c.shimGetSendersWithDtmf(n);f.shimRTCIceCandidate(n);f.shimMaxMessageSize(n);f.shimSendThrowTypeError(n);break;case"firefox":if(!m||!m.shimPeerConnection||!i.shimFirefox){s("Firefox shim is not included in this adapter release.");return g}s("adapter.js shimming firefox.");g.browserShim=m;f.shimCreateObjectURL(n);m.shimGetUserMedia(n);m.shimSourceObject(n);m.shimPeerConnection(n);m.shimOnTrack(n);m.shimRemoveStream(n);f.shimRTCIceCandidate(n);f.shimMaxMessageSize(n);f.shimSendThrowTypeError(n);break;case"edge":if(!p||!p.shimPeerConnection||!i.shimEdge){s("MS edge shim is not included in this adapter release.");return g}s("adapter.js shimming edge.");g.browserShim=p;f.shimCreateObjectURL(n);p.shimGetUserMedia(n);p.shimPeerConnection(n);p.shimReplaceTrack(n);f.shimMaxMessageSize(n);f.shimSendThrowTypeError(n);break;case"safari":if(!l||!i.shimSafari){s("Safari shim is not included in this adapter release.");return g}s("adapter.js shimming safari.");g.browserShim=l;f.shimCreateObjectURL(n);l.shimRTCIceServerUrls(n);l.shimCallbacksAPI(n);l.shimLocalStreamsAPI(n);l.shimRemoteStreamsAPI(n);l.shimTrackEventTransceiver(n);l.shimGetUserMedia(n);l.shimCreateOfferLegacy(n);f.shimRTCIceCandidate(n);f.shimMaxMessageSize(n);f.shimSendThrowTypeError(n);break;default:s("Unsupported browser!");break;}return g}},{"./chrome/chrome_shim":5,"./common_shim":7,"./edge/edge_shim":8,"./firefox/firefox_shim":10,"./safari/safari_shim":12,"./utils":13}],5:[function(e,t){'use strict';var r=e("../utils.js"),a=r.log;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)}});var a=t.RTCPeerConnection.prototype.setRemoteDescription;t.RTCPeerConnection.prototype.setRemoteDescription=function(){var r=this;if(!r._ontrackpoly){r._ontrackpoly=function(a){a.stream.addEventListener("addtrack",function(e){var n;if(t.RTCPeerConnection.prototype.getReceivers){n=r.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=[a.stream];r.dispatchEvent(i)});a.stream.getTracks().forEach(function(e){var n;if(t.RTCPeerConnection.prototype.getReceivers){n=r.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=[a.stream];r.dispatchEvent(i)})};r.addEventListener("addstream",r._ontrackpoly)}return a.apply(r,arguments)}}else if(!("RTCRtpTransceiver"in t)){r.wrapPeerConnectionEvent(t,"track",function(t){if(!t.transceiver){t.transceiver={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}})}},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 n=r.detectBrowser(e);if(e.RTCPeerConnection.prototype.addTrack&&65<=n.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 a(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 d=e.RTCPeerConnection.prototype.setLocalDescription;e.RTCPeerConnection.prototype.setLocalDescription=function(){var e=this;if(!arguments.length||!arguments[0].type){return d.apply(e,arguments)}arguments[0]=a(e,arguments[0]);return d.apply(e,arguments)};var c=Object.getOwnPropertyDescriptor(e.RTCPeerConnection.prototype,"localDescription");Object.defineProperty(e.RTCPeerConnection.prototype,"localDescription",{get:function get(){var e=this,r=c.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=r.detectBrowser(e);if(!e.RTCPeerConnection&&e.webkitRTCPeerConnection){e.RTCPeerConnection=function(t,r){a("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}})}}else{var n=e.RTCPeerConnection;e.RTCPeerConnection=function(e,t){if(e&&e.iceServers){for(var a=[],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;a.push(s)}else{a.push(e.iceServers[o])}}e.iceServers=a}return new n(e,t)};e.RTCPeerConnection.prototype=n.prototype;Object.defineProperty(e.RTCPeerConnection,"generateCertificate",{get:function get(){return n.generateCertificate}})}var i=e.RTCPeerConnection.prototype.getStats;e.RTCPeerConnection.prototype.getStats=function(e,t,r){var a=this,n=arguments;if(0<arguments.length&&"function"==typeof e){return i.apply(this,arguments)}if(0===i.length&&(0===arguments.length||"function"!=typeof arguments[0])){return i.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[1](s(o(e)))};return i.apply(this,[d,arguments[0]])}return new Promise(function(e,t){i.apply(a,[function(t){e(s(o(t)))},t])}).then(t,r)};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 o=e.RTCPeerConnection.prototype.addIceCandidate;e.RTCPeerConnection.prototype.addIceCandidate=function(){if(!arguments[0]){if(arguments[1]){arguments[1].apply(null)}return Promise.resolve()}return o.apply(this,arguments)}}}},{"../utils.js":13,"./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 d=66>t.version;if(s&&("user"===s.exact||"environment"===s.exact||"user"===s.ideal||"environment"===s.ideal)&&!(n.mediaDevices.getSupportedConstraints&&n.mediaDevices.getSupportedConstraints().facingMode&&!d)){delete e.video.facingMode;var c;if("environment"===s.exact||"environment"===s.ideal){c=["back","rear"]}else if("user"===s.exact||"user"===s.ideal){c=["front"]}if(c){return n.mediaDevices.enumerateDevices().then(function(t){t=t.filter(function(e){return"videoinput"===e.kind});var n=t.find(function(e){return c.some(function(t){return-1!==e.label.toLowerCase().indexOf(t)})});if(!n&&t.length&&-1!==c.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(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.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 d=function(e){return new Promise(function(t,r){n.getUserMedia(e,t,r)})};if(!n.mediaDevices){n.mediaDevices={getUserMedia:d,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 d(e)}}else{var p=n.mediaDevices.getUserMedia.bind(n.mediaDevices);n.mediaDevices.getUserMedia=function(e){return o(e,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("","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":13}],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 d=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 d.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{r=57===t.version?65535:65536}}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},d=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),c;if(0===r&&0===a){c=Number.POSITIVE_INFINITY}else if(0===r||0===a){c=Math.max(r,a)}else{c=Math.min(r,a)}var p={};Object.defineProperty(p,"maxMessageSize",{get:function get(){return c}});e._sctp=p}return d.apply(e,arguments)}},shimSendThrowTypeError:function shimSendThrowTypeError(e){if(!(e.RTCPeerConnection&&"createDataChannel"in e.RTCPeerConnection.prototype)){return}var t=e.RTCPeerConnection.prototype.createDataChannel;e.RTCPeerConnection.prototype.createDataChannel=function(){var e=this,r=t.apply(e,arguments),a=r.send;r.send=function(){var t=this,r=arguments[0],n=r.length||r.size||r.byteLength;if(n>e.sctp.maxMessageSize){throw new DOMException("Message too large (can send a maximum of "+e.sctp.maxMessageSize+" bytes)","TypeError")}return a.apply(t,arguments)};return r}}}},{"./utils":13,sdp:2}],8:[function(e,t){'use strict';var r=e("../utils"),a=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 n=Object.getOwnPropertyDescriptor(e.MediaStreamTrack.prototype,"enabled");Object.defineProperty(e.MediaStreamTrack.prototype,"enabled",{set:function set(e){n.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}e.RTCPeerConnection=a(e,t.version)},shimReplaceTrack:function shimReplaceTrack(e){if(e.RTCRtpSender&&!("replaceTrack"in e.RTCRtpSender.prototype)){e.RTCRtpSender.prototype.replaceTrack=e.RTCRtpSender.prototype.setTrack}}}},{"../utils":13,"./getusermedia":9,"rtcpeerconnection-shim":1}],9:[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))})}}},{}],10:[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))}})}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 d=0,c;d<s.urls.length;d++){c={url:s.urls[d]};if(0===s.urls[d].indexOf("turn")){c.username=s.username;c.credential=s.credential}n.push(c)}}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)}},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)}})}}}},{"../utils":13,"./getusermedia":11}],11:[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))})},d=function(e){return new Promise(function(t,r){s(e,t,r)})};if(!n.mediaDevices){n.mediaDevices={getUserMedia:d,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 c=n.mediaDevices.enumerateDevices.bind(n.mediaDevices);n.mediaDevices.enumerateDevices=function(){return c().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 f=i.prototype.getSettings;i.prototype.getSettings=function(){var e=f.apply(this,arguments);m(e,"mozAutoGainControl","autoGainControl");m(e,"mozNoiseSuppression","noiseSuppression");return e}}if(i&&i.prototype.applyConstraints){var g=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 g.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":13}],12:[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){var t=this;if(this._onaddstream){this.removeEventListener("addstream",this._onaddstream);this.removeEventListener("track",this._onaddstreampoly)}this.addEventListener("addstream",this._onaddstream=e);this.addEventListener("track",this._onaddstreampoly=function(r){r.streams.forEach(function(e){if(!t._remoteStreams){t._remoteStreams=[]}if(0<=t._remoteStreams.indexOf(e)){return}t._remoteStreams.push(e);var r=new Event("addstream");r.stream=e;t.dispatchEvent(r)})})}})}},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.offerToReceiveAudio){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":13}],13:[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){a(r(t))};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)}}})},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 _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 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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)});
 //# sourceMappingURL=adapter.min.js.map
diff --git a/lib/amd/build/adapter.min.js.map b/lib/amd/build/adapter.min.js.map
index abfd827a578..7ae1a5bb041 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\nvar SDPUtils = require('sdp');\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! 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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() === 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// 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    // 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 ((kind === 'application' && protocol === 'DTLS/SCTP') || rejected) {\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                    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                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\nif (transceiver.iceGatherer) {\ntransceiver.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        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                    sdp += 'm=application 0 DTLS/SCTP 5000\\r\\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() {\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        var fixStatsType = function(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        return new Promise(function(resolve) {\n            // shim getStats with maplike support\n            var results = new Map();\n            Promise.all(promises).then(function(res) {\n                res.forEach(function(result) {\n                    Object.keys(result).forEach(function(id) {\n                        result[id].type = fixStatsType(result[id]);\n                        results.set(id, result[id]);\n                    });\n                });\n                resolve(results);\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.\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        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.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); // was: relAddr\n        sdp.push('rport');\n        sdp.push(candidate.relatedPort); // was: relPort\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    // was: channels\n    parsed.numChannels = parts.length === 3 ? parseInt(parts[2], 10) : 1;\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    return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +\n        (codec.numChannels !== 1 ? '/' + codec.numChannels : '') + '\\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            params.push(param + '=' + codec.parameters[param]);\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\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    caps.headerExtensions.forEach(function(extension) {\n        sdp += SDPUtils.writeExtmap(extension);\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.split(' ');\n            parts.shift();\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                rtx: {\n                    ssrc: secondarySsrc\n                }\n            };\n            encodingParameters.push(encParam);\n            if (hasRed) {\n                encParam = JSON.parse(JSON.stringify(encParam));\n                encParam.fec = {\n                    ssrc: secondarySsrc,\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    var cname;\n    // Gets the first SSRC. Note that 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(parts) {\n            return parts.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\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\nSDPUtils.writeSessionBoilerplate = function(sessId, sessVer) {\n    var sessionId;\n    var version = sessVer !== undefined ? sessVer : 2;\n    if (sessId) {\n        sessionId = sessId;\n    } else {\n        sessionId = SDPUtils.generateSessionId();\n    }\n    // FIXME: sess-id should be an NTP timestamp.\n    return 'v=0\\r\\n' +\n        'o=thisisadapterortc ' + sessionId + ' ' + version + ' 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// Expose public methods.\nif (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\nvar utils = require('./utils');\n// Shimming starts here.\nmodule.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\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\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.shimCallbacksAPI(window);\n            safariShim.shimLocalStreamsAPI(window);\n            safariShim.shimRemoteStreamsAPI(window);\n            safariShim.shimTrackEventTransceiver(window);\n            safariShim.shimGetUserMedia(window);\n            safariShim.shimCreateOfferLegacy(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\":10,\"./safari/safari_shim\":12,\"./utils\":13}],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';\nvar utils = require('../utils.js');\nvar logging = utils.log;\n\nmodule.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            });\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 if (!('RTCRtpTransceiver' in window)) {\n            utils.wrapPeerConnectionEvent(window, 'track', function(e) {\n                if (!e.transceiver) {\n                    e.transceiver = {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    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        } else {\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                            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            Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {\n                get: function() {\n                    return OrigPeerConnection.generateCertificate;\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\n},{\"../utils.js\":13,\"./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';\nvar utils = require('../utils.js');\nvar logging = utils.log;\n\n// Expose public methods.\nmodule.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        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.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\":13}],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\nvar SDPUtils = require('sdp');\nvar utils = require('./utils');\n\nmodule.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 {\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                }\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        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            var origDataChannelSend = dataChannel.send;\n\n            // Patch 'send' method\n            dataChannel.send = function() {\n                var dc = this;\n                var data = arguments[0];\n                var length = data.length || data.size || data.byteLength;\n                if (length > pc.sctp.maxMessageSize) {\n                    throw new DOMException('Message too large (can send a maximum of ' +\n                        pc.sctp.maxMessageSize + ' bytes)', 'TypeError');\n                }\n                return origDataChannelSend.apply(dc, arguments);\n            };\n\n            return dataChannel;\n        };\n    }\n};\n\n},{\"./utils\":13,\"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\nvar utils = require('../utils');\nvar shimRTCPeerConnection = require('rtcpeerconnection-shim');\n\nmodule.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        window.RTCPeerConnection =\n            shimRTCPeerConnection(window, browserDetails.version);\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\":13,\"./getusermedia\":9,\"rtcpeerconnection-shim\":1}],9:[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.\nmodule.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},{}],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\nvar utils = require('../utils');\n\nmodule.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            });\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    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\n},{\"../utils\":13,\"./getusermedia\":11}],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\nvar utils = require('../utils');\nvar logging = utils.log;\n\n// Expose public methods.\nmodule.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\":13}],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'use strict';\nvar utils = require('../utils');\n\nmodule.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                    var pc = this;\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 (!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            });\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.offerToReceiveAudio !== '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\":13}],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\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.\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(e) {\n            cb(wrapper(e));\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    });\n}\n\n// Utility methods.\nmodule.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"],"file":"adapter.min.js"}
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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
diff --git a/lib/amd/src/adapter.js b/lib/amd/src/adapter.js
index 282f7b2c236..13a5850b12b 100644
--- a/lib/amd/src/adapter.js
+++ b/lib/amd/src/adapter.js
@@ -18,1700 +18,19 @@
 
 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 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;
-    };
-
-    // 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
-                // Ñ•dpMLineIndex > 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 ((kind === 'application' && protocol === 'DTLS/SCTP') || rejected) {
-                // TODO: this is dangerous in the case where a non-rejected m-line
-                //     becomes rejected.
-                pc.transceivers[sdpMLineIndex] = {
-                    mid: mid,
-                    kind: kind,
-                    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);
-                    }
-                }
-
-                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';
-        }
-        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') {
-                    sdp += 'm=application 0 DTLS/SCTP 5000\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() {
-        var promises = [];
-        this.transceivers.forEach(function(transceiver) {
-            ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',
-                'dtlsTransport'].forEach(function(method) {
-                if (transceiver[method]) {
-                    promises.push(transceiver[method].getStats());
-                }
-            });
-        });
-        var fixStatsType = function(stat) {
+        /*
+         *  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',
@@ -1719,3245 +38,5382 @@ transceiver.iceGatherer.close();
                 localcandidate: 'local-candidate',
                 remotecandidate: 'remote-candidate'
             }[stat.type] || stat.type;
-        };
-        return new Promise(function(resolve) {
-            // shim getStats with maplike support
-            var results = new Map();
-            Promise.all(promises).then(function(res) {
-                res.forEach(function(result) {
-                    Object.keys(result).forEach(function(id) {
-                        result[id].type = fixStatsType(result[id]);
-                        results.set(id, result[id]);
+        }
+
+        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());
+                        }
                     });
                 });
-                resolve(results);
-            });
-        });
-    };
-
-    // 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],
-        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.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); // was: relAddr
-        sdp.push('rport');
-        sdp.push(candidate.relatedPort); // was: relPort
-    }
-    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
-    // was: channels
-    parsed.numChannels = parts.length === 3 ? parseInt(parts[2], 10) : 1;
-    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;
-    }
-    return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +
-        (codec.numChannels !== 1 ? '/' + codec.numChannels : '') + '\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) {
-            params.push(param + '=' + codec.parameters[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;
-};
-
-// 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';
-
-    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.split(' ');
-            parts.shift();
-            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),
-                rtx: {
-                    ssrc: secondarySsrc
-                }
-            };
-            encodingParameters.push(encParam);
-            if (hasRed) {
-                encParam = JSON.parse(JSON.stringify(encParam));
-                encParam.fec = {
-                    ssrc: secondarySsrc,
-                    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 = {};
-
-    var cname;
-    // Gets the first SSRC. Note that 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 attrÑ–bute.
-    // 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(parts) {
-            return parts.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
-SDPUtils.writeSessionBoilerplate = function(sessId, sessVer) {
-    var sessionId;
-    var version = sessVer !== undefined ? sessVer : 2;
-    if (sessId) {
-        sessionId = sessId;
-    } else {
-        sessionId = SDPUtils.generateSessionId();
-    }
-    // FIXME: sess-id should be an NTP timestamp.
-    return 'v=0\r\n' +
-        'o=thisisadapterortc ' + 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],
-    };
-}
-
-// 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);
-
-            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);
-
-            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.shimCallbacksAPI(window);
-            safariShim.shimLocalStreamsAPI(window);
-            safariShim.shimRemoteStreamsAPI(window);
-            safariShim.shimTrackEventTransceiver(window);
-            safariShim.shimGetUserMedia(window);
-            safariShim.shimCreateOfferLegacy(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":10,"./safari/safari_shim":12,"./utils":13}],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;
-
-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);
-                }
-            });
-            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);
+                return Promise.all(promises).then(function(allStats) {
+                    var results = new Map();
+                    allStats.forEach(function(stats) {
+                        stats.forEach(function(stat) {
+                            results.set(stat.id, stat);
                         });
-                        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;
+                    });
+                    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]);
                                 });
-                            } else {
-                                receiver = {track: track};
+                                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);
                             }
-                            var event = new Event('track');
-                            event.track = track;
-                            event.receiver = receiver;
-                            event.transceiver = {receiver: receiver};
-                            event.streams = [e.stream];
-                            pc.dispatchEvent(event);
+                            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));
                         });
                     };
-                    pc.addEventListener('addstream', pc._ontrackpoly);
-                }
-                return origSetRemoteDescription.apply(pc, arguments);
-            };
-        } else if (!('RTCRtpTransceiver' in window)) {
-            utils.wrapPeerConnectionEvent(window, 'track', function(e) {
-                if (!e.transceiver) {
-                    e.transceiver = {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;
+                    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
                             }
-                        }
-                        return this._dtmf;
-                    },
-                    _pc: pc
-                };
-            };
+                        });
+                    };
+                } 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;
+                    };
 
-            // 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.
+                    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) {
-                    var pc = this;
-                    var sender = origAddTrack.apply(pc, arguments);
-                    if (!sender) {
-                        sender = shimSenderWithDtmf(pc, track);
-                        pc._senders.push(sender);
+                    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;
-                    origRemoveTrack.apply(pc, arguments);
-                    var idx = pc._senders.indexOf(sender);
-                    if (idx !== -1) {
-                        pc._senders.splice(idx, 1);
+                    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);
                 };
-            }
-            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]);
+            shimAddTrackRemoveTrack: function(window) {
+                var browserDetails = utils.detectBrowser(window);
+                // shim addTrack and removeTrack.
+                if (window.RTCPeerConnection.prototype.addTrack &&
+                    browserDetails.version >= 65) {
+                    return this.shimAddTrackRemoveTrackWithNative(window);
+                }
 
-                stream.getTracks().forEach(function(track) {
-                    var sender = pc._senders.find(function(s) {
+                // 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 (sender) {
-                        pc._senders.splice(pc._senders.indexOf(sender), 1); // remove sender
+                    if (alreadyExists) {
+                        throw new DOMException('Track already exists.',
+                            'InvalidAccessError');
                     }
-                });
-            };
-        } 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;
-                }
-            });
-        }
-    },
+                    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);
 
-    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);
+                        // 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);
                     }
-                });
-            }
-        }
-    },
-
-    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);
+                    return pc.getSenders().find(function(s) {
+                        return s.track === track;
                     });
-            };
-        });
-
-        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;
-                    }
-                });
-            }
-        } else {
-            // 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;
-                            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.
-            Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
-                get: function() {
-                    return OrigPeerConnection.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) {
+                // 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 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;
+                        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 promise.then(function() {
-                                args[1].apply(null, []);
-                            },
-                            function(err) {
-                                if (args.length >= 3) {
-                                    args[2].apply(null, [err]);
-                                }
+                        return nativeMethod.apply(pc, arguments)
+                            .then(function(description) {
+                                return replaceInternalStreamId(pc, description);
                             });
                     };
                 });
-        }
 
-        // 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 origSetLocalDescription =
+                    window.RTCPeerConnection.prototype.setLocalDescription;
+                window.RTCPeerConnection.prototype.setLocalDescription = 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]);
+                    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;
+                            }
                         });
                     }
-                    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();
+
+                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);
+                        });
+                };
             }
-            return nativeAddIceCandidate.apply(this, arguments);
         };
-    }
-};
 
-},{"../utils.js":13,"./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;
+    },{"../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;
+        // 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);
+            var constraintsToChrome_ = function(c) {
+                if (typeof c !== 'object' || c.mandatory || c.optional) {
+                    return c;
                 }
-                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) {
+                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_(mix, key)] = r[mix];
+                        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];
+                if (c.advanced) {
+                    cc.optional = (cc.optional || []).concat(c.advanced);
                 }
+                return cc;
             };
-            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'];
+            var shimConstraints_ = function(constraints, func) {
+                if (browserDetails.version >= 61) {
+                    return func(constraints);
                 }
-                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;
+                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);
                                 });
-                            });
-                            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);
                 }
-            }
-            constraints.video = constraintsToChrome_(constraints.video);
-        }
-        logging('chrome: ' + JSON.stringify(constraints));
-        return func(constraints);
-    };
+                logging('chrome: ' + JSON.stringify(constraints));
+                return func(constraints);
+            };
 
-    var shimError_ = function(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.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));
+            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;
+                    }
+                };
+            };
 
-    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: ''};
-                        }));
+            var getUserMedia_ = function(constraints, onSuccess, onError) {
+                shimConstraints_(constraints, function(c) {
+                    navigator.webkitGetUserMedia(c, onSuccess, function(e) {
+                        if (onError) {
+                            onError(shimError_(e));
+                        }
                     });
                 });
-            },
-            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":13}],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 {
-                    // 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;
-                }
-            }
-            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
-
-        var origCreateDataChannel =
-            window.RTCPeerConnection.prototype.createDataChannel;
-        window.RTCPeerConnection.prototype.createDataChannel = function() {
-            var pc = this;
-            var dataChannel = origCreateDataChannel.apply(pc, arguments);
-            var origDataChannelSend = dataChannel.send;
-
-            // Patch 'send' method
-            dataChannel.send = function() {
-                var dc = this;
-                var data = arguments[0];
-                var length = data.length || data.size || data.byteLength;
-                if (length > pc.sctp.maxMessageSize) {
-                    throw new DOMException('Message too large (can send a maximum of ' +
-                        pc.sctp.maxMessageSize + ' bytes)', 'TypeError');
-                }
-                return origDataChannelSend.apply(dc, arguments);
             };
 
-            return dataChannel;
+            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":13,"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';
+    },{"../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 utils = require('../utils');
-var shimRTCPeerConnection = require('rtcpeerconnection-shim');
+        var SDPUtils = require('sdp');
+        var utils = require('./utils');
 
-module.exports = {
-    shimGetUserMedia: require('./getusermedia'),
-    shimPeerConnection: function(window) {
-        var browserDetails = utils.detectBrowser(window);
+        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;
+                }
 
-        if (window.RTCIceGatherer) {
-            if (!window.RTCIceCandidate) {
+                var NativeRTCIceCandidate = window.RTCIceCandidate;
                 window.RTCIceCandidate = function(args) {
-                    return 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);
                 };
-            }
-            if (!window.RTCSessionDescription) {
-                window.RTCSessionDescription = function(args) {
-                    return 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);
                 };
-            }
-            // 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);
+                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]);
                     }
                 });
-            }
-        }
 
-        // 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;
+                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 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;
-        }
+                    return canSendMaxMessageSize;
+                };
 
-        window.RTCPeerConnection =
-            shimRTCPeerConnection(window, browserDetails.version);
-    },
-    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;
-        }
-    }
-};
+                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;
 
-},{"../utils":13,"./getusermedia":9,"rtcpeerconnection-shim":1}],9:[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));
-        });
-    };
-};
-
-},{}],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';
-
-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);
+                    // 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;
                     }
-                    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));
-                }
-            });
-        }
-        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;
+                    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;
                 });
             }
-        }
-    },
+        };
 
-    shimPeerConnection: function(window) {
-        var browserDetails = utils.detectBrowser(window);
+    },{"./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';
 
-        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) {
+        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) {
-                    // .urls is not supported in FF < 38.
-                    // create RTCIceServers with a single url.
+                    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')) {
-                                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);
-                                }
+                            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 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);
+                    return new OrigPeerConnection(pcConfig, pcConstraints);
                 };
-            });
-
-        // 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);
-        };
-    },
-
-    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);
-                }
-            });
-        };
-    }
-};
-
-},{"../utils":13,"./getusermedia":11}],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');
-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":13}],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.
-*/
-'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;
+                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;
                         }
                     });
                 }
-                if (this._remoteStreams) {
-                    this._remoteStreams.forEach(function(stream) {
-                        if (stream.id === id) {
-                            result = stream;
+            },
+            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};
                         }
                     });
                 }
-                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) {
+            shimCreateOfferLegacy: function(window) {
+                var origCreateOffer = window.RTCPeerConnection.prototype.createOffer;
+                window.RTCPeerConnection.prototype.createOffer = function(offerOptions) {
                     var pc = 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 (!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);
+                    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';
                         });
-                    });
-                }
-            });
-        }
-    },
-    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';
+                        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');
                         }
-                    } else if (audioTransceiver.direction === 'recvonly') {
-                        if (audioTransceiver.setDirection) {
-                            audioTransceiver.setDirection('inactive');
-                        } else {
-                            audioTransceiver.direction = 'inactive';
+
+
+                        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');
                         }
                     }
-                } else if (offerOptions.offerToReceiveAudio === true &&
-                    !audioTransceiver) {
-                    pc.addTransceiver('audio');
-                }
-
-
-                if (typeof offerOptions.offerToReceiveAudio !== '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);
+                };
             }
-            return origCreateOffer.apply(pc, arguments);
         };
-    }
-};
 
-},{"../utils":13}],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';
+    },{"../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;
+        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.
-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);
+        /**
+         * 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);
         }
-        var wrappedCallback = function(e) {
-            cb(wrapper(e));
-        };
-        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);
-            }
-        }
-    });
-}
-
-// 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_) {
+        // 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;
             }
-            if (typeof console !== 'undefined' && typeof console.log === 'function') {
-                console.log.apply(console, arguments);
+            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;
             }
-        }
-    },
+        };
 
-    /**
-     * 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)
+    },{}]},{},[3])(3)
 });
+
diff --git a/lib/thirdpartylibs.xml b/lib/thirdpartylibs.xml
index 19c689ebbb8..b423952c815 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>6.1.5</version>
+    <version>6.4.0</version>
     <licenseversion>3-Clause</licenseversion>
   </library>
   <library>