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import {AudioTrackKind} from './track-enums';
import Track from './track';
import {merge} from '../utils/obj';
/**
* A representation of a single `AudioTrack`. If it is part of an {@link AudioTrackList}
* only one `AudioTrack` in the list will be enabled at a time.
*
* @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#audiotrack}
* @extends Track
*/
class AudioTrack extends Track {
/**
* Create an instance of this class.
*
* @param {Object} [options={}]
* Object of option names and values
*
* @param {AudioTrack~Kind} [options.kind='']
* A valid audio track kind
*
* @param {string} [options.id='vjs_track_' + Guid.newGUID()]
* A unique id for this AudioTrack.
*
* @param {string} [options.label='']
* The menu label for this track.
*
* @param {string} [options.language='']
* A valid two character language code.
*
* @param {boolean} [options.enabled]
* If this track is the one that is currently playing. If this track is part of
* an {@link AudioTrackList}, only one {@link AudioTrack} will be enabled.
*/
constructor(options = {}) {
const settings = merge(options, {
kind: AudioTrackKind[options.kind] || ''
});
super(settings);
let enabled = false;
/**
* @memberof AudioTrack
* @member {boolean} enabled
* If this `AudioTrack` is enabled or not. When setting this will
* fire {@link AudioTrack#enabledchange} if the state of enabled is changed.
* @instance
*
* @fires VideoTrack#selectedchange
*/
Object.defineProperty(this, 'enabled', {
get() {
return enabled;
},
set(newEnabled) {
// an invalid or unchanged value
if (typeof newEnabled !== 'boolean' || newEnabled === enabled) {
return;
}
enabled = newEnabled;
/**
* An event that fires when enabled changes on this track. This allows
* the AudioTrackList that holds this track to act accordingly.
*
* > Note: This is not part of the spec! Native tracks will do
* this internally without an event.
*
* @event AudioTrack#enabledchange
* @type {Event}
*/
this.trigger('enabledchange');
}
});
// if the user sets this track to selected then
// set selected to that true value otherwise
// we keep it false
if (settings.enabled) {
this.enabled = settings.enabled;
}
this.loaded_ = true;
}
}
export default AudioTrack;
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