Packagecom.greensock.loading
Classpublic class MP3Loader
InheritanceMP3Loader Inheritance LoaderItem Inheritance LoaderCore Inheritance flash.events.EventDispatcher

Loads an MP3 audio file.

OPTIONAL VARS PROPERTIES
The following special properties can be passed into the MP3Loader constructor via its vars parameter:

content data type: flash.media.Sound

NOTE: To avoid garbage collection issues in the Flash player, the Sound object that MP3Loader employs must get recreated internally anytime the MP3Loader is unloaded or its loading is cancelled, so it is best to access the content after the COMPLETE event has been dispatched. Otherwise, if you store a reference to the MP3Loader's content before or during a load and it gets cancelled or unloaded for some reason, the Sound object won't be the one into which the MP3 is eventually loaded.


Example
Example AS3 code:
 import com.greensock.loading.*;
 import com.greensock.events.LoaderEvent;
 
 //create a MP3Loader that will begin playing immediately when it loads
 var loader:MP3Loader = new MP3Loader("mp3/audio.mp3", {name:"audio", autoPlay:true, repeat:3, estimatedBytes:9500});
 
 //begin loading
 loader.load();
 
 //Or you could put the MP3Loader into a LoaderMax. Create one first...
 var queue:LoaderMax = new LoaderMax({name:"mainQueue", onProgress:progressHandler, onComplete:completeHandler, onError:errorHandler});
 
 //append the MP3Loader and several other loaders
 queue.append( loader );
 queue.append( new XMLLoader("xml/doc.xml", {name:"xmlDoc", estimatedBytes:425}) );
 queue.append( new ImageLoader("img/photo1.jpg", {name:"photo1", estimatedBytes:3500}) );
 
 //start loading
 queue.load();
 
 //pause loading
 queue.pause();
 
 //resume loading
 queue.resume();
 
 function progressHandler(event:LoaderEvent):void {
   trace("progress: " + event.target.progress);
 }
 
 function completeHandler(event:LoaderEvent):void {
   trace(event.target + " is complete!");
 }
 
 function errorHandler(event:LoaderEvent):void {
   trace("error occured with " + event.target + ": " + event.text);
 }
 
Copyright 2010, GreenSock. All rights reserved. This work is subject to the terms in http://www.greensock.com/terms_of_use.html or for corporate Club GreenSock members, the software agreement that was issued with the corporate membership.



Public Properties
 PropertyDefined by
 InheritedauditedSize : Boolean
Indicates whether or not the loader's bytesTotal value has been set by any of the following:
  • Defining an estimatedBytes in the vars object passed to the constructor
  • Calling auditSize() and getting a response (an error is also considered a response)
  • When a LoaderMax instance begins loading, it will automatically force a call to auditSize() for any of its children that don't have an estimatedBytes defined.
LoaderCore
 InheritedautoDispose : Boolean
When autoDispose is true, the loader will be disposed immediately after it completes (it calls the dispose() method internally after dispatching its COMPLETE event).
LoaderCore
 InheritedbytesLoaded : uint
Bytes loaded
LoaderCore
 InheritedbytesTotal : uint
Total bytes that are to be loaded by the loader.
LoaderCore
 Inheritedcontent : *
The content that was loaded by the loader which varies by the type of loader:
  • ImageLoader - A com.greensock.loading.display.ContentDisplay (a Sprite) which contains the ImageLoader's rawContent (a flash.display.Bitmap unless script access was denied in which case rawContent will be a flash.display.Loader to avoid security errors).
LoaderCore
 InheritedhttpStatus : int
The httpStatus code of the loader.
LoaderItem
 InheritedloadTime : Number
The number of seconds that elapsed between when the loader began and when it either completed, failed, or was canceled.
LoaderCore
 Inheritedname : String
A name that you use to identify the loader instance.
LoaderCore
 Inheritedpaused : Boolean
If a loader is paused, its progress will halt and any LoaderMax instances to which it belongs will either skip over it or stop when its position is reached in the queue (depending on whether or not the LoaderMax's skipPaused property is true).
LoaderCore
 Inheritedprogress : Number
A value between 0 and 1 indicating the overall progress of the loader.
LoaderCore
 Inheritedrequest : URLRequest
The URLRequest associated with the loader.
LoaderItem
 InheritedscriptAccessDenied : Boolean
If the loaded content is denied script access (because of security sandbox restrictions, a missing crossdomain.xml file, etc.), scriptAccessDenied will be set to true.
LoaderItem
 Inheritedstatus : int
Integer code indicating the loader's status; options are LoaderStatus.READY, LoaderStatus.LOADING, LoaderStatus.COMPLETE, LoaderStatus.PAUSED, and LoaderStatus.DISPOSED.
LoaderCore
 Inheritedurl : String
The url from which the loader should get its content.
LoaderItem
 Inheritedvars : Object
An object containing optional configuration details, typically passed through a constructor parameter.
LoaderCore
Public Methods
 MethodDefined by
  
MP3Loader(urlOrRequest:*, vars:Object = null)
Constructor.
MP3Loader
 Inherited
addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
LoaderCore
 Inherited
auditSize():void
Attempts loading just enough of the content to accurately determine the bytesTotal in order to improve the accuracy of the progress property.
LoaderItem
 Inherited
cancel():void
If the loader is currently loading (status is LoaderStatus.LOADING), it will be canceled immediately and its status will change to LoaderStatus.READY.
LoaderCore
 Inherited
dispose(flushContent:Boolean = false):void
Disposes of the loader and releases it internally for garbage collection.
LoaderCore
 Inherited
load(flushContent:Boolean = false):void
Loads the loader's content, optionally flushing any previously loaded content first.
LoaderCore
 Inherited
pause():void
Pauses the loader immediately.
LoaderCore
 Inherited
prioritize(loadNow:Boolean = true):void
Immediately prioritizes the loader inside any LoaderMax instances that contain it, forcing it to the top position in their queue and optionally calls load() immediately as well.
LoaderCore
 Inherited
resume():void
Unpauses the loader and resumes loading immediately.
LoaderCore
 Inherited
toString():String
Returns information about the loader, like its type, its name, and its url (if it has one).
LoaderCore
 Inherited
unload():void
Removes any content that was loaded and sets bytesLoaded back to zero.
LoaderCore
Events
 EventSummaryDefined by
 Inherited Dispatched when the loader is canceled while loading which can occur either because of a failure or when a sibling loader is prioritized in a LoaderMax queue.LoaderCore
 Inherited Dispatched when the loader completes.LoaderCore
 Inherited Dispatched when the loader experiences some type of error, like a SECURITY_ERROR or IO_ERROR.LoaderCore
 Inherited Dispatched when the loader fails.LoaderCore
 Inherited Dispatched when the loader experiences an IO_ERROR while loading or auditing its size.LoaderItem
 Inherited Dispatched when the loader starts loading.LoaderCore
 Inherited Dispatched each time the bytesLoaded value changes while loading (indicating progress).LoaderCore
Constructor detail
MP3Loader()constructor
public function MP3Loader(urlOrRequest:*, vars:Object = null)

Constructor.

Parameters
urlOrRequest:* — The url (String) or URLRequest from which the loader should get its content
 
vars:Object (default = null) — An object containing optional configuration details. For example: new MP3Loader("mp3/audio.mp3", {name:"audio", autoPlay:true, onComplete:completeHandler, onProgress:progressHandler}).

The following special properties can be passed into the constructor via the vars parameter:
  • name : String - A name that is used to identify the MP3Loader instance. This name can be fed to the find() method or traced at any time. Each loader's name should be unique. If you don't define one, a unique name will be created automatically, like "loader21".
  • autoPlay : Boolean - If autoPlay is true, the MP3 will begin playing immediately when the COMPLETE event fires. The default value is false.
  • repeat : int - Number of times that the mp3 should repeat. To repeat indefinitely, use -1. Default is 0.
  • alternateURL : String - If you define an alternateURL, the loader will initially try to load from its original url and if it fails, it will automatically (and permanently) change the loader's url to the alternateURL and try again. Think of it as a fallback or backup url. It is perfectly acceptable to use the same alternateURL for multiple loaders (maybe a default image for various ImageLoaders for example).
  • context : SoundLoaderContext - To control things like the buffer time and whether or not a policy file is checked, define a SoundLoaderContext object. The default context is null. See Adobe's SoundLoaderContext documentation for details.
  • noCache : Boolean - If noCache is true, a "cacheBusterID" parameter will be appended to the url with a random set of numbers to prevent caching (don't worry, this info is ignored when you getLoader() or getContent() by url and when you're running locally)
  • estimatedBytes : uint - Initially, the loader's bytesTotal is set to the estimatedBytes value (or LoaderMax.defaultEstimatedBytes if one isn't defined). Then, when the loader begins loading and it can accurately determine the bytesTotal, it will do so. Setting estimatedBytes is optional, but the more accurate the value, the more accurate your loaders' overall progress will be initially. If the loader will be inserted into a LoaderMax instance (for queue management), its auditSize feature can attempt to automatically determine the bytesTotal at runtime (there is a slight performance penalty for this, however - see LoaderMax's documentation for details).
  • requireWithRoot : DisplayObject - LoaderMax supports subloading, where an object can be factored into a parent's loading progress. If you want LoaderMax to require this MP3Loader as part of its parent SWFLoader's progress, you must set the requireWithRoot property to your swf's root. For example, var loader:MP3Loader = new MP3Loader("audio.mp3", {name:"audio", requireWithRoot:this.root});
  • autoDispose : Boolean - When autoDispose is true, the loader will be disposed immediately after it completes (it calls the dispose() method internally after dispatching its COMPLETE event). This will remove any listeners that were defined in the vars object (like onComplete, onProgress, onError, onInit). Once a loader is disposed, it can no longer be found with LoaderMax.getLoader() or LoaderMax.getContent() - it is essentially destroyed but its content is not unloaded (you must call unload() or dispose(true) to unload its content). The default autoDispose value is false.

    ----EVENT HANDLER SHORTCUTS----
  • onOpen : Function - A handler function for LoaderEvent.OPEN events which are dispatched when the loader begins loading. Make sure your onOpen function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
  • onInit : Function - A handler function for Event.INIT events which will be dispatched when the MP3 has streamed enough of its content to identify the ID3 meta data. Make sure your onInit function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
  • onProgress : Function - A handler function for LoaderEvent.PROGRESS events which are dispatched whenever the bytesLoaded changes. Make sure your onProgress function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent). You can use the LoaderEvent's target.progress to get the loader's progress value or use its target.bytesLoaded and target.bytesTotal.
  • onComplete : Function - A handler function for LoaderEvent.COMPLETE events which are dispatched when the loader has finished loading successfully. Make sure your onComplete function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
  • onCancel : Function - A handler function for LoaderEvent.CANCEL events which are dispatched when loading is aborted due to either a failure or because another loader was prioritized or cancel() was manually called. Make sure your onCancel function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
  • onError : Function - A handler function for LoaderEvent.ERROR events which are dispatched whenever the loader experiences an error (typically an IO_ERROR or SECURITY_ERROR). An error doesn't necessarily mean the loader failed, however - to listen for when a loader fails, use the onFail special property. Make sure your onError function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
  • onFail : Function - A handler function for LoaderEvent.FAIL events which are dispatched whenever the loader fails and its status changes to LoaderStatus.FAILED. Make sure your onFail function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
  • onIOError : Function - A handler function for LoaderEvent.IO_ERROR events which will also call the onError handler, so you can use that as more of a catch-all whereas onIOError is specifically for LoaderEvent.IO_ERROR events. Make sure your onIOError function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).