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Audio Channel Manager
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/** | |
* Use audio channel manager in System app[1]. | |
* | |
* AppWindowManager.prototype.handleEvent = function(evt) { | |
* switch (evt.type) { | |
* case 'appcreated': | |
* var app = evt.detail; | |
* this._apps[evt.detail.instanceID] = app; | |
* audioChannelManager.register(app.browser.element); | |
* break; | |
* } | |
* }; | |
* | |
* [1] https://github.com/mozilla-b2g/gaia/blob/master/apps/system/js/app_window_manager.js#L496 | |
*/ | |
function AudioChannelManager() { | |
this._playingApps = []; | |
this._pausedApps = []; | |
} | |
AudioChannelManager.prototype = { | |
// A list of mozBrowser elements. | |
_playingApps: null, | |
_pausedApps: null, | |
_competingResults: { | |
PLAY: 0, | |
VIBRATE: 1, | |
SMALLER_VOLUME_FOR_NEW_CHANNEL: 2, | |
SMALLER_VOLUME_FOR_CURRENT_CHANNEL: 3, | |
PAUSE_THEN_RESUME_CURRENTCHANNEL: 4 | |
}, | |
register: function(app) { | |
app.addEventListener('mozaudiochannelchange', function(evt) { | |
switch (evt.detail.state) { | |
case 'play': | |
this._handleAudioChannelCompeting(evt.detail.channel); | |
break; | |
case 'end': | |
if (this._pausedApps.length) { | |
this._resumePausedAudioChannel(); | |
} | |
break; | |
} | |
}); | |
}, | |
/** | |
* Do we need `unregister` method to remove the listener | |
* when app is killed? | |
*/ | |
unregister: function() {}, | |
/** | |
* Implement the table of audio channel competing. | |
*/ | |
_handleAudioChannelCompeting: function(channel) { | |
var competingResults = this._competingResults; | |
switch (this.compete(channel)) { | |
case competingResults.PLAY: | |
this._play(app, channel); | |
break; | |
case competingResults.VIBRATE: | |
this._vibrate(app); | |
break; | |
case competingResults.SMALLER_VOLUME_FOR_NEW_CHANNEL: | |
this._play(app, channel, 0.2); | |
break; | |
case competingResults.SMALLER_VOLUME_FOR_CURRENT_CHANNEL: | |
_playingApps.forEach(function(app) { | |
Array.prototype.forEach.call(app.allowedAudioChannels, function(channel) { | |
this._play(app, channel, 0.2); | |
}); | |
}); | |
break; | |
case competingResults.PAUSE_THEN_RESUME_CURRENTCHANNEL: | |
this._pause(app, channel); | |
break; | |
} | |
}, | |
_compete: function(newAudioChannel) { | |
// Compete with current playing channel. | |
return resultCode; | |
}, | |
_resumePausedAudioChannel: function() {}, | |
_play: function(app, audioChannel, volume) {}, | |
_vibrate: function(app) {}, | |
_pause: function(app, channel) {}, | |
_pauseThenResume: function(app1, app2, audioChannel1, audioChannel2) {} | |
}; |
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