b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
146 lines
3.2 KiB
JavaScript
146 lines
3.2 KiB
JavaScript
/* exported Playlist */
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/* m3u parsing. */
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/*
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* http://tools.ietf.org/html/draft-pantos-http-live-streaming-14
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* http://en.wikipedia.org/wiki/M3U
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* http://forums.winamp.com/showthread.php?threadid=65772
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* http://schworak.com/blog/e39/m3u-play-list-specification/
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*/
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'use strict';
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/*
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* API defined:
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* Playlist a class that encapsulate a playlist as well as its serialisation
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*
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* Constructor Playlist(path)
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*
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* Playlist.parse(path): contruct and parse a playlist from file.
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* Return a promise for it.
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*/
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function Playlist(path) {
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this._songs = [];
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this._directory = null;
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if (path) {
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this._directory = path;
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var idx = this._directory.lastIndexOf('/');
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if (idx !== -1) {
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this._directory = this._directory.slice(0, idx + 1);
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}
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}
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}
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Playlist.parse = function(path) {
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var promise = new Promise(
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function(resolve, reject) {
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var storage = navigator.getDeviceStorage('music');
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var request = storage.get(path);
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request.onsuccess = function() {
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var reader = new FileReader();
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var file = request.result;
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reader.readAsText(file);
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reader.onerror = function() {
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reject(new Error('Error reading: ' + path + ': ' + this.error));
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};
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reader.onload = function() {
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var pl = new Playlist(path);
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pl.fromString(reader.result);
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resolve(pl);
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};
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};
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request.onerror = function() {
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reject(new Error('Couldn\'t get path: ' + path + ': ' + this.error));
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};
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});
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return promise;
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};
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Playlist.isUrl = function(path) {
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var re = /^(https?|ftp|file|mms|rtmp):\//;
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return re.test(path);
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};
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Playlist.prototype = {
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get songs() {
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return this._songs;
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},
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get directory() {
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return this._directory;
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},
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// m3u state that path is either absolute or relative to the playlist
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_makeAbsolutePath: function(path) {
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if (!this._directory || Playlist.isUrl(path)) {
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return path;
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}
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if (path[0] === '/') {
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return path;
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}
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return this._directory + path;
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},
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/*
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* song is a path string.
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* index is the index to insert the song at. If -1 or undefined
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* song is added at the end if the array.
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*/
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addSong: function(song, index) {
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if (!song) {
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throw new Error('invalid');
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}
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var absPath = this._makeAbsolutePath(song);
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if (index === undefined || index === -1 || index >= this._songs.length) {
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this._songs.push(absPath);
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} else {
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this._songs.splice(index, 0, absPath);
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}
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},
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removeSong: function(path) {
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var absPath = this._makeAbsolutePath(path);
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var idx = this._songs.indexOf(absPath);
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if (idx != -1) {
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this._songs.splice(idx, 1);
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}
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},
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removeSongAt: function(index) {
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this._songs.splice(index, 1);
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},
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toString: function() {
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var content = '';
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content += '#EXTM3U\n';
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var entry;
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for (entry of this._songs) {
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content += entry + '\n';
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}
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return content;
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},
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fromString: function(content) {
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var lines = content.toString().split('\n');
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for (var i = 0; i < lines.length; i++){
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var line = lines[i].trim();
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if (line === '' || line.startsWith('#')) {
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continue;
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}
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this._songs.push(this._makeAbsolutePath(line));
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}
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}
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};
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