Sample Sound Class

From WebOS101

Create a models directory in app and create music.js with the following contents:

// Copyright (c) 2009 Roy Sutton - You may use this class with your applications
// Background music class for webOS
var Music = {
    source: undefined,
 
    setupMusic: function(src, repeat)
    {
        this.source = src;
        audioObj = new Audio();
        audioObj.addEventListener(Media.Event.X_PALM_CONNECT, this.audioIsReady.bind(this));
        audioObj.addEventListener(Media.Event.X_PALM_DISCONNECT, this.audioIsGone);
        if(repeat === true)
        {
            audioObj.addEventListener(Media.Event.ENDED, this.audioRepeat);
        }
    },
 
    playMusic: function()
    {
        if(audioObj.src === this.source)
        {
            audioObj.play();
        }
        else
        {
            audioObj.src = this.source;
        }
 
    },
 
    pauseMusic: function()
    {
        audioObj.pause();
    },
 
    audioIsReady: function(event)
    {
        if(Prefs.music)
        {
            event.target.src = this.source;
        }
    },
 
    audioIsGone: function(event)
    {
        event.target.pause();
    },
 
    audioRepeat: function(event)
    {
        event.target.play();
    }
};

Modify sources.js:

{"source": "/usr/palm/frameworks/media/Audio.js"},
    {"source": "app/models/music.js"},

Add the following in your first scene's setup for this to be used as background music:

Mojo.Event.listen(document, Mojo.Event.stageDeactivate, this.pauseMusic.bind(this));
    Mojo.Event.listen(document, Mojo.Event.stageActivate, this.resumeMusic.bind(this));
    Music.setupMusic(Mojo.appPath+"/mysound.wav", true);

Then create the following:

MainAssistant.prototype.pauseMusic = function(event) {
    Music.pauseMusic();
};
 
MainAssistant.prototype.resumeMusic = function(event) {
    Music.playMusic();
};

Notes

• This could be optimized a bit more and any comments are welcome.
• Suggested improvements:
  • Add callback for sound done.
  • Add cache to allow for multiple sounds, reusing discarded sounds to prevent memory leaks

Useful Links

• webOSdev Forum Post