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Code Issues Releases Wiki Activity

Add basic metadata scanning for JS Resolvers

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This commit is contained in:
Uwe L. Korn
2014-06-10 16:01:49 +01:00
parent 50370f7b53
commit fff437d7a3
3 changed files with 216 additions and 1 deletions
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55
data/js/tomahawk.js
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@@ -4,7 +4,7 @@
* Copyright 2011-2012, Leo Franchi <lfranchi@kde.org>
* Copyright 2011, Thierry Goeckel
* Copyright 2013, Teo Mrnjavac <teo@kde.org>
* Copyright 2013, Uwe L. Korn <uwelk@xhochy.com>
* Copyright 2013-2014, Uwe L. Korn <uwelk@xhochy.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@@ -277,6 +277,59 @@ Tomahawk.syncRequest = function (url, extraHeaders, options) {
}
};
/**
* Internal counter used to identify retrievedMetadata call back from native
* code.
*/
Tomahawk.retrieveMetadataIdCounter = 0;
/**
* Internal map used to map metadataIds to the respective JavaScript callbacks.
*/
Tomahawk.retrieveMetadataCallbacks = {};
/**
* Retrieve metadata for a media stream.
*
* @param url String The URL which should be scanned for metadata.
* @param mimetype String The mimetype of the stream, e.g. application/ogg
* @param sizehint Size in bytes if not supplied possibly the whole file needs
* to be downloaded
* @param options Object Map to specify various parameters related to the media
* URL. This includes:
* * headers: Object of HTTP(S) headers that should be set on doing the
* request.
* * method: String HTTP verb to be used (default: GET)
* * username: Username when using authentication
* * password: Password when using authentication
* @param callback Function(Object,String) This function is called on completeion.
* If an error occured, error is set to the corresponding message else
* null.
*/
Tomahawk.retrieveMetadata = function (url, mimetype, sizehint, options, callback) {
var metadataId = Tomahawk.retrieveMetadataIdCounter;
Tomahawk.retrieveMetadataIdCounter++;
Tomahawk.retrieveMetadataCallbacks[metadataId] = callback;
Tomahawk.nativeRetrieveMetadata(metadataId, url, mimetype, sizehint, options);
};
/**
* Pass the natively retrieved metadata back to the JavaScript callback.
*
* Internal use only!
*/
Tomahawk.retrievedMetadata = function(metadataId, metadata, error) {
// Check we have a matching callback stored.
if (!Tomahawk.retrieveMetadataCallbacks.hasOwnProperty(metadataId)) {
return;
}
// Call the real callback
Tomahawk.retrieveMetadataCallbacks[metadataId](metadata, error);
// Callback are only used once.
delete Tomahawk.retrieveMetadataCallbacks[metadataId];
};
/**
* Internal counter used to identify asyncRequest callback from native code.
*/