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351 lines
8.4 KiB
JavaScript
351 lines
8.4 KiB
JavaScript
dojo.provide("dojox.av.FLAudio");
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dojo.experimental("dojox.av.FLAudio");
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dojo.require("dijit._Widget");
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dojo.require("dojox.embed.Flash");
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dojo.require("dojox.av._Media");
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dojo.require("dojox.timing.doLater");
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dojo.declare("dojox.av.FLAudio", null, {
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// summary:
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// Play MP3 files through the Flash SWF built in the
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// DEFT project.
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// description:
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// This class is brand new, so there is a lot of
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// functionality not yet available. The initial
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// purpose is for playing "event" sounds like button
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// clicks, and for loading and controlling multiple
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// sounds at once. As of yet, streaming is not supported
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// and polling the sounds for events during playback
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// may still be missing information. Markup is not
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// supported, as it may not be needed.
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//
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// TODO:
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// Streaming, playback events, crossdomain, CDN support,
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// (alternate SWF location), global volume, ID3 tag,
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// factor out doLater, onLoadStatus needs work,
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// play(position) / seek()
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//
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// example:
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// | new dojox.av.FLAudio({
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// | initialVolume:.7,
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// | initialPan:0,
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// | autoPlay:false
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// | });
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//
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// id: String?
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// The id of this widget and the id of the SWF movie.
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id:"",
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//
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// initialVolume: Number
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// From 0-1
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// Sets volume for all files unless changed with doPlay
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// or setVolume
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initialVolume: 0.7,
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//
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// initialPan: Number
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// From -1 to 1 (-1 is left, 1 is right, 0 is middle)
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// Sets pan for all files unless changed with play
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// or setPan
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initialPan: 0,
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//
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// autoPlay: Boolean
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// If true, all files will play upon load. If false,
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// they load and wait for doPlay() command.
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//
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// isDebug: Boolean?
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// Setting to true tells the SWF to output log messages to Firebug.
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isDebug: false,
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//
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// statusInterval: Number
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// How often in milliseconds that the status of the
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// player is checked - both load and play
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statusInterval:200,
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//
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// _swfPath: Uri
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// The path to the video player SWF resource
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_swfPath: dojo.moduleUrl("dojox.av", "resources/audio.swf"),
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//
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//
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constructor: function(/*Object*/options){
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dojo.mixin(this, options || {});
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if(!this.id){ this.id = "flaudio_"+new Date().getTime(); }
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this.domNode = dojo.doc.createElement("div");
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dojo.style(this.domNode, {
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postion:"relative",
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width:"1px",
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height:"1px",
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top:"1px",
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left:"1px"
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});
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dojo.body().appendChild(this.domNode);
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this.init();
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},
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init: function(){
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// summary:
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// Initialize the media.
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//
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//
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this._subs = [];
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this.initialVolume = this._normalizeVolume(this.initialVolume);
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var args = {
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path:this._swfPath.uri,
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width:"1px",
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height:"1px",
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minimumVersion:9, // this may need to be 10, not sure
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expressInstall:true,
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params:{
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wmode:"transparent"
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},
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// only pass in simple variables - no deep objects
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vars:{
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id:this.id,
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autoPlay:this.autoPlay,
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initialVolume:this.initialVolume,
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initialPan:this.initialPan,
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statusInterval:this.statusInterval,
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isDebug:this.isDebug
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}
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};
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this._sub("mediaError", "onError");
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this._sub("filesProgress", "onLoadStatus");
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this._sub("filesAllLoaded", "onAllLoaded");
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this._sub("mediaPosition", "onPlayStatus");
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this._sub("mediaMeta", "onID3");
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this._flashObject = new dojox.embed.Flash(args, this.domNode);
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this._flashObject.onError = function(err){
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console.warn("Flash Error:", err);
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alert(err);
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};
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this._flashObject.onLoad = dojo.hitch(this, function(mov){
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this.flashMedia = mov;
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this.isPlaying = this.autoPlay;
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this.isStopped = !this.autoPlay;
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this.onLoad(this.flashMedia);
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});
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},
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// ============== //
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// Loading Files //
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// ============== //
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load: function(/*Object*/options){
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// summary:
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// Adds a media object to the playlist
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// ***This can be called repeatedly to add multiple items.
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// options: Object
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// url: String
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// (required) path to MP3 media
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// url must be absolute or relative to SWF,
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// not dojo or the html. An effort will be made
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// to fix incorrect paths.
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// id: String
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// (optional) an identifier to later determine
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// which media to control.
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// returns:
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// The normalized url, which can be used to identify the
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// audio.
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//
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if(dojox.timing.doLater(this.flashMedia, this)){ return false; }
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if(!options.url){
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throw new Error("An url is required for loading media");
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return false;
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}else{
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options.url = this._normalizeUrl(options.url);
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}
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this.flashMedia.load(options);
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return options.url; // String
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},
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// ============================= //
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// Methods to control the sound //
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// ============================= //
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doPlay: function(/*Object*/options){
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// summary:
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// Tell media to play, based on
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// the options passed.
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// options: Object
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// volume: Number
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// Sets the volume
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// pan: Number
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// Sets left/right pan
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// index:Number OR id:String OR url:String
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// Choose one of the above to indentify
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// the media you wish to control. id is
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// set by you. index is the order in which
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// media was added (zero based)
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// NOTE: lack of an identifier will default
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// to first (or only) item.
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// NOTE: Can't name this method "play()" as it causes
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// an IE error.
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this.flashMedia.doPlay(options);
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},
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pause: function(/*Object*/options){
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// summary:
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// Tell media to pause, based on identifier in
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// the options passed.
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// options: Object
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// index:Number OR id:String OR url:String
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// See doPlay()
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//
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this.flashMedia.pause(options);
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},
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stop: function(/*Object*/options){
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// summary:
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// Tell media to stop, based on identifier in
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// the options passed.
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// options:
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// index:Number OR id:String OR url:String
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// See doPlay()
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//
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this.flashMedia.doStop(options);
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},
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setVolume: function(/*Object*/options){
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// summary:
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// Set media volume, based on identifier in
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// the options passed.
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// options:
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// volume: Number
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// 0 to 1
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// index:Number OR id:String OR url:String
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// See doPlay()
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//
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this.flashMedia.setVolume(options);
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},
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setPan: function(/*Object*/options){
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// summary:
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// Set media pan, based on identifier in
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// the options passed.
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// options:
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// pan:Number
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// -1 to 1
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// index:Number OR id:String OR url:String
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// See doPlay()
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//
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this.flashMedia.setPan(options);
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},
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getVolume: function(/*Object*/options){
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// summary:
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// Get media volume, based on identifier in
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// the options passed.
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// options:
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// index:Number OR id:String OR url:String
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// See doPlay()
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//
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return this.flashMedia.getVolume(options);
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},
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getPan: function(/*Object*/options){
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// summary:
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// Set media pan, based on identifier in
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// the options passed.
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// options:
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// index:Number OR id:String OR url:String
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// See doPlay()
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//
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return this.flashMedia.getPan(options);
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},
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// ============= //
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// Sound Events //
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// ============= //
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onError: function(msg){
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// summary:
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// stub fired when an error occurs
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console.warn("SWF ERROR:", msg)
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},
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onLoadStatus: function(/*Array*/events){
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// summary:
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},
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onAllLoaded: function(){
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// summary:
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// stub fired
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},
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onPlayStatus: function(/*Array*/events){
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// summary:
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},
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onLoad: function(){
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// summary:
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// stub fired when SWF is ready
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},
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onID3: function(evt){
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// summary:
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// Fired when the ID3 data is received.
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},
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destroy: function(){
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// summary:
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// destroys flash
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if(!this.flashMedia){
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this._cons.push(dojo.connect(this, "onLoad", this, "destroy"));
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return;
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}
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dojo.forEach(this._subs, function(s){
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dojo.unsubscribe(s);
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});
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dojo.forEach(this._cons, function(c){
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dojo.disconnect(c);
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});
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this._flashObject.destroy();
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//dojo._destroyElement(this.flashDiv);
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},
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_sub: function(topic, method){
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// summary:
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// helper for subscribing to topics
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dojo.subscribe(this.id+"/"+topic, this, method);
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},
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_normalizeVolume: function(vol){
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// summary:
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// Ensures volume is less than one
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//
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if(vol>1){
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while(vol>1){
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vol*=.1
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}
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}
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return vol;
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},
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_normalizeUrl: function(_url){
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// summary:
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// Checks that path is relative to HTML file or
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// convertes it to an absolute path.
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//
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if(_url && _url.toLowerCase().indexOf("http")<0){
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//
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// Appears to be a relative path. Attempt to convert it to absolute,
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// so it will better target the SWF.
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var loc = window.location.href.split("/");
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loc.pop();
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loc = loc.join("/")+"/";
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_url = loc+_url;
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}
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return _url;
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}
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});
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