JavaScript-ID3-Reader/src/id3.js at master · dreamdeveloper/JavaScript-ID3-Reader · GitHub

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* JavaScript ID3 Tag Reader 0.1.2

* MIT License [http://www.opensource.org/licenses/mit-license.php]

* Extended by António Afonso (antonio.afonso@opera.com), Opera Software ASA

* Modified by António Afonso <antonio.afonso gmail.com>

(function(ns) {

var ID3 = ns.ID3 = {};

var _files = {};

// location of the format identifier

var _formatIDRange = [0, 7];

/**

* Finds out the tag format of this data and returns the appropriate

* reader.

function getTagReader(data) {

// FIXME: improve this detection according to the spec

return data.getStringAt(4, 7) == "ftypM4A" ? ID4 :

(data.getStringAt(0, 3) == "ID3" ? ID3v2 : ID3v1);

}

function readTags(reader, data, url, tags) {

var tagsFound = reader.readTagsFromData(data, tags);

//console.log("Downloaded data: " + data.getDownloadedBytesCount() + "bytes");

var tags = _files[url] || {};

for( var tag in tagsFound ) if( tagsFound.hasOwnProperty(tag) ) {

tags[tag] = tagsFound[tag];

}

_files[url] = tags;

}

ID3.clearTags = function(url) {

delete _files[url];

};

ID3.clearAll = function() {

_files = {};

};

/**

* @param {string} url The location of the sound file to read.

* @param {function()} cb The callback function to be invoked when all tags have been read.

* @param {{tags: Array.<string>, dataReader: function(string, function(BinaryReader))}} options The set of options that can specify the tags to be read and the dataReader to use in order to read the file located at url.

ID3.loadTags = function(url, cb, options) {

options = options || {};

var dataReader = options["dataReader"] || BufferedBinaryAjax;

dataReader(url, function(data) {

// preload the format identifier

data.loadRange(_formatIDRange, function() {

var reader = getTagReader(data);

reader.loadData(data, function() {

readTags(reader, data, url, options["tags"]);

if( cb ) cb();

});

}, options["onError"]);

};

ID3.getAllTags = function(url) {

if (!_files[url]) return null;

var tags = {};

for (var a in _files[url]) {

if (_files[url].hasOwnProperty(a))

tags[a] = _files[url][a];

}

return tags;

};

ID3.getTag = function(url, tag) {

if (!_files[url]) return null;

return _files[url][tag];

};

// Export functions for closure compiler

ns["ID3"] = ns.ID3;

ID3["loadTags"] = ID3.loadTags;

ID3["getAllTags"] = ID3.getAllTags;

ID3["getTag"] = ID3.getTag;

ID3["clearTags"] = ID3.clearTags;

ID3["clearAll"] = ID3.clearAll;

})(this);

JavaScript-ID3-Reader/src/id3.js at master · dreamdeveloper/JavaScript-ID3-Reader · GitHub

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