HTML5-iOS/ImpactJS Sound Effect sprite (Prototype)

gistfile1.txt

var SoundSprite = function(src, schedule) {
    var me = this;
    me.src = src;
    me.schedule = schedule;
    me.init();
};

SoundSprite.prototype = {
    currentIndex : 0,
    numSounds : 2,
    setVolume : function(volume) {
        this.audio.volume = volume;
    },
    init : function() {
        var me    = this,
            i     = 0,
            audio = new Audio(),
            src;

		// Probe sound formats and determine the file extension to load
		for(; i < ig.Sound.use.length; i++ ) {
			var format = ig.Sound.use[i];
			if( audio.canPlayType(format.mime) ) {
				this.format = format;
				break;
			}
		}

        if( !this.format ) {
			ig.Sound.enabled = false;
		    return;
        }

        src = me.src.match(/^(.*)\.[^\.]+$/)[1] + '.' + this.format.ext + ig.nocache;

        me.audio = audio;
        audio.src = src;

        audio.play();
        audio.addEventListener('timeupdate', Ext.Function.bind(me.onAudioTimeUpdate, me));
    },

    play : function(sound) {
        var me     = this,
            region = me.schedule[sound],
            audio  = me.audio;

        if (audio.currentTime > 0) {
            audio.pause();
        }
        audio.currentTime = region[0];
        me.endTime = region[1];
        audio.play();
    },
    onAudioTimeUpdate : function(evt) {
        var me = this,
            audio = me.audio;

        if (me.endTime && audio.currentTime > me.endTime) {
            audio.pause();
            delete me.endTime;
        }
    }
};