source: Dev/trunk/src/client/dojox/mobile/Audio.js

define([
        "dojo/_base/declare",
        "dojo/dom-construct",
        "dojo/sniff",
        "dijit/_Contained",
        "dijit/_WidgetBase"
], function(declare, domConstruct, has, Contained, WidgetBase){
        // module:
        //              dojox/mobile/Audio

        return declare("dojox.mobile.Audio", [WidgetBase, Contained], {
                // summary:
                //              A thin wrapper around the HTML5 `<audio>` element.
                // description:
                //              dojox/mobile/Audio is a widget which plays audio. If all sources cannot 
                //              be played (typically, in desktop browsers that do not support `<audio>`), 
                //              dojox/mobile/Audio automatically replaces `<audio>` with `<embed>`, such 
                //              that the browser tries to play it with a suitable plug-in.
                
                // source: [const] Array
                //              An array of src and type,
                //              ex. [{src:"a.mp3", type:"audio/mpeg"}, {src:"a.ogg", type:"audio/ogg"}, ...].
                //              The src gives the path of the media resource. The type gives the
                //              type of the media resource.
                //              Note that changing the value of the property after the widget
                //              creation has no effect.
                source: null,

                // width: [const] String
                //              The width of the embed element. 
                //              Note that changing the value of the property after the widget
                //              creation has no effect.
                width: "200px",

                // height: [const] String
                //              The height of the embed element.
                //              Note that changing the value of the property after the widget
                //              creation has no effect.
                height: "15px",

                // _playable: [private] Boolean
                //              Internal flag.
                _playable: false,
                
                // _tag: [private] String
                //              The name of the tag ("audio").
                _tag: "audio",

                constructor: function(){
                        // summary:
                        //              Creates a new instance of the class.
                        this.source = [];
                },

                buildRendering: function(){
                        this.domNode = this.srcNodeRef || domConstruct.create(this._tag);
                },

                _getEmbedRegExp: function(){
                        // tags:
                        //              private
                        return has('ff') ? /audio\/mpeg/i :
                                   has('ie') ? /audio\/wav/i :
                                   null;
                },

                startup: function(){
                        if(this._started){ return; }
                        this.inherited(arguments);
                        var i;
                        if(this.domNode.canPlayType){
                                if(this.source.length > 0){
                                        for(i = 0, len = this.source.length; i < len; i++){
                                                domConstruct.create("source", {src:this.source[i].src, type:this.source[i].type}, this.domNode);
                                                this._playable = this._playable || !!this.domNode.canPlayType(this.source[i].type);
                                        }
                                }else{
                                        for(i = 0, len = this.domNode.childNodes.length; i < len; i++){
                                                var n = this.domNode.childNodes[i];
                                                if(n.nodeType === 1 && n.nodeName === "SOURCE"){
                                                        this.source.push({src:n.src, type:n.type});
                                                        this._playable = this._playable || !!this.domNode.canPlayType(n.type);
                                                }
                                        }
                                }
                        }
                        has.add("mobile-embed-audio-video-support", true);      //It should move to staticHasFeatures
                        if(has("mobile-embed-audio-video-support")){
                                if(!this._playable){
                                        for(i = 0, len = this.source.length, re = this._getEmbedRegExp(); i < len; i++){
                                                if(this.source[i].type.match(re)){
                                                        var node = domConstruct.create("embed", {
                                                                src: this.source[0].src,
                                                                type: this.source[0].type,
                                                                width: this.width,
                                                                height: this.height
                                                        });
                                                        this.domNode.parentNode.replaceChild(node, this.domNode);
                                                        this.domNode = node;
                                                        this._playable = true;
                                                        break;
                                                }
                                        }
                                }
                        }
                }

        });
});