audioClass

var som = {
	$el: $('#botaoMute'),
	muted: false,
	playlist: {},
	list: [
		{ id:'acerto',  url:'./jogos/audio/acerto.mp3', loop: false, volume:1 },
		{ id:'erro',    url:'./jogos/audio/erro.mp3',   loop: false, volume:1 },
		{ id:'trilha1', url:'./jogos/audio/trilha1.mp3', loop: true,  volume:0.2 },
		{ id:'trilha2',  url:'./jogos/audio/trilha2.mp3', loop: true,  volume:0.2 },
	],
	init: function(){
		this.addEvents();
	},
	addEvents: function(){
		var self = this;
		this.$el.on('click', function(){
			self.toggle();
			$(this).toggleClass('muted', self.muted );
		});
	},
	preload: function( cb ){
		var count = 0;
		var self = this;
		function tryInit(){
			if( count >= self.list.length ){
				cb();
			}
		};

		for (var i = this.list.length - 1; i >= 0; i--) {
			var sound = this.list[i];
			this.add( 
				sound.id,
				sound.url,
				sound.loop,
				sound.volume,
				function(){ count++; tryInit(); }
			);
		}
	},
	add: function( id, url, loop, volume, cb ){
		if( this.playlist[id] ) return false;
		var som = new Audio( url );
		som.loop = loop || false;
		som.volume = volume !== undefined ? volume : 1 ;
		som._volume = volume !== undefined ? volume : 1 ;

		var self = this;
		$(som).on("canplaythrough", function() {
			console.log('som carregado');
			self.playlist[id] = som;
			if( cb ) cb();
		});			
		return this;
	},
	start: function( id ){
		if( this.playlist[id] == undefined ) return false;
		this.stop(id);
		this.playlist[id].play();
	},
	pause: function( id ){
		if( id == undefined ){
			for( var som in this.playlist ){
				this.playlist[ som ].pause();
			}
		}else{
			this.playlist[id].pause();
		}			
	},
	stop: function( id ){
		if( id == undefined ){
			for( var som in this.playlist ){
				this.playlist[ som ].pause();
				this.playlist[ som ].currentTime = 0;
			}
		}else{
			this.playlist[id].pause();
			this.playlist[id].currentTime = 0;
		}			
	},
	toggle: function(){
		this.muted = !this.muted;
		for( var som in this.playlist ){
			this.playlist[ som ].volume = ( this.muted )? 0 : this.playlist[ som ]._volume ;
		}
	}
};
this.som = som;