--- /dev/null
+'use strict';
+
+exports.__esModule = true;
+
+var _trackList = require('./track-list');
+
+var _trackList2 = _interopRequireDefault(_trackList);
+
+var _browser = require('../utils/browser.js');
+
+var browser = _interopRequireWildcard(_browser);
+
+var _document = require('global/document');
+
+var _document2 = _interopRequireDefault(_document);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj['default'] = obj; return newObj; } }
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; } /**
+ * @file audio-track-list.js
+ */
+
+
+/**
+ * Anywhere we call this function we diverge from the spec
+ * as we only support one enabled audiotrack at a time
+ *
+ * @param {AudioTrackList} list
+ * list to work on
+ *
+ * @param {AudioTrack} track
+ * The track to skip
+ *
+ * @private
+ */
+var disableOthers = function disableOthers(list, track) {
+ for (var i = 0; i < list.length; i++) {
+ if (track.id === list[i].id) {
+ continue;
+ }
+ // another audio track is enabled, disable it
+ list[i].enabled = false;
+ }
+};
+
+/**
+ * The current list of {@link AudioTrack} for a media file.
+ *
+ * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#audiotracklist}
+ * @extends TrackList
+ */
+
+var AudioTrackList = function (_TrackList) {
+ _inherits(AudioTrackList, _TrackList);
+
+ /**
+ * Create an instance of this class.
+ *
+ * @param {AudioTrack[]} [tracks=[]]
+ * A list of `AudioTrack` to instantiate the list with.
+ */
+ function AudioTrackList() {
+ var _this, _ret;
+
+ var tracks = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
+
+ _classCallCheck(this, AudioTrackList);
+
+ var list = void 0;
+
+ // make sure only 1 track is enabled
+ // sorted from last index to first index
+ for (var i = tracks.length - 1; i >= 0; i--) {
+ if (tracks[i].enabled) {
+ disableOthers(tracks, tracks[i]);
+ break;
+ }
+ }
+
+ // IE8 forces us to implement inheritance ourselves
+ // as it does not support Object.defineProperty properly
+ if (browser.IS_IE8) {
+ list = _document2['default'].createElement('custom');
+ for (var prop in _trackList2['default'].prototype) {
+ if (prop !== 'constructor') {
+ list[prop] = _trackList2['default'].prototype[prop];
+ }
+ }
+ for (var _prop in AudioTrackList.prototype) {
+ if (_prop !== 'constructor') {
+ list[_prop] = AudioTrackList.prototype[_prop];
+ }
+ }
+ }
+
+ list = (_this = _possibleConstructorReturn(this, _TrackList.call(this, tracks, list)), _this);
+ list.changing_ = false;
+
+ return _ret = list, _possibleConstructorReturn(_this, _ret);
+ }
+
+ /**
+ * Add an {@link AudioTrack} to the `AudioTrackList`.
+ *
+ * @param {AudioTrack} track
+ * The AudioTrack to add to the list
+ *
+ * @fires Track#addtrack
+ * @private
+ */
+
+
+ AudioTrackList.prototype.addTrack_ = function addTrack_(track) {
+ var _this2 = this;
+
+ if (track.enabled) {
+ disableOthers(this, track);
+ }
+
+ _TrackList.prototype.addTrack_.call(this, track);
+ // native tracks don't have this
+ if (!track.addEventListener) {
+ return;
+ }
+
+ /**
+ * @listens AudioTrack#enabledchange
+ * @fires TrackList#change
+ */
+ track.addEventListener('enabledchange', function () {
+ // when we are disabling other tracks (since we don't support
+ // more than one track at a time) we will set changing_
+ // to true so that we don't trigger additional change events
+ if (_this2.changing_) {
+ return;
+ }
+ _this2.changing_ = true;
+ disableOthers(_this2, track);
+ _this2.changing_ = false;
+ _this2.trigger('change');
+ });
+ };
+
+ /**
+ * Add an {@link AudioTrack} to the `AudioTrackList`.
+ *
+ * @param {AudioTrack} track
+ * The AudioTrack to add to the list
+ *
+ * @fires Track#addtrack
+ */
+
+
+ AudioTrackList.prototype.addTrack = function addTrack(track) {
+ this.addTrack_(track);
+ };
+
+ /**
+ * Remove an {@link AudioTrack} from the `AudioTrackList`.
+ *
+ * @param {AudioTrack} track
+ * The AudioTrack to remove from the list
+ *
+ * @fires Track#removetrack
+ */
+
+
+ AudioTrackList.prototype.removeTrack = function removeTrack(track) {
+ _TrackList.prototype.removeTrack_.call(this, track);
+ };
+
+ return AudioTrackList;
+}(_trackList2['default']);
+
+exports['default'] = AudioTrackList;
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