/*

Copyright (c) 2008 Christopher Martin-Sperry (audiofx.org@gmail.com)



Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:



The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.



THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

*/



package org.audiofx.mp3

{

	import flash.display.Loader;

	import flash.display.LoaderInfo;

	import flash.events.Event;

	import flash.events.EventDispatcher;

	import flash.media.Sound;

	import flash.net.FileReference;

	import flash.utils.ByteArray;

	import flash.utils.Endian;

	

	/**

	 * Dispatched when the MP3 data is loaded

	* @eventType org.audiofx.mp3.MP3SoundEvent.COMPLETE 

	* 

	*/

	[Event(name="complete", type="org.audiofx.mp3.MP3SoundEvent")]

	/**

	 * Class for loading MP3 files from a FileReference

	 * @author spender

	 * @see flash.net.FileReference

	 */

	public class MP3FileReferenceLoader extends EventDispatcher

	{

		private var mp3Parser:MP3Parser;

		

		/**

		 * Constructs an new MP3FileReferenceLoader instance 

		 * 

		 */

		public function MP3FileReferenceLoader()

		{

			mp3Parser=new MP3Parser();

			mp3Parser.addEventListener(Event.COMPLETE,parserCompleteHandler);

			

		}

		/**

		 * Once a FileReference instance has been obtained, and the user has browsed to a file, call getSound to start loading the MP3 data.

		 * When the data is ready, an <code>MP3SoundEvent.COMPLETE</code> event is emitted.

		 * @param fr A reference to a local file.

		 * @see MP3SoundEvent

		 */

		public function getSound(fr:FileReference):void

		{

			

			mp3Parser.loadFileRef(fr);

		}

		private function parserCompleteHandler(ev:Event):void

		{

			var parser:MP3Parser=ev.currentTarget as MP3Parser;

			generateSound(parser);

		}

		private function generateSound(mp3Source:MP3Parser):Boolean

		{

			var swfBytes:ByteArray=new ByteArray();

			swfBytes.endian=Endian.LITTLE_ENDIAN;

			for(var i:uint=0;i<SoundClassSwfByteCode.soundClassSwfBytes1.length;++i)

			{

				swfBytes.writeByte(SoundClassSwfByteCode.soundClassSwfBytes1[i]);

			}

			var swfSizePosition:uint=swfBytes.position;

			swfBytes.writeInt(0); //swf size will go here

			for(i=0;i<SoundClassSwfByteCode.soundClassSwfBytes2.length;++i)

			{

				swfBytes.writeByte(SoundClassSwfByteCode.soundClassSwfBytes2[i]);

			}

			var audioSizePosition:uint=swfBytes.position;

			swfBytes.writeInt(0); //audiodatasize+7 to go here

			swfBytes.writeByte(1);

			swfBytes.writeByte(0);

			mp3Source.writeSwfFormatByte(swfBytes);

			

			var sampleSizePosition:uint=swfBytes.position;

			swfBytes.writeInt(0); //number of samples goes here

			

			swfBytes.writeByte(0); //seeksamples

			swfBytes.writeByte(0);

						

			var frameCount:uint=0;

			

			var byteCount:uint=0; //this includes the seeksamples written earlier

						

			for(;;)

			{

			

				var seg:ByteArraySegment=mp3Source.getNextFrame();

				if(seg==null)break;

				swfBytes.writeBytes(seg.byteArray,seg.start,seg.length);

				byteCount+=seg.length;

				frameCount++;

			}

			if(byteCount==0)

			{

				return false;

			}

			byteCount+=2;



			var currentPos:uint=swfBytes.position;

			swfBytes.position=audioSizePosition;

			swfBytes.writeInt(byteCount+7);

			swfBytes.position=sampleSizePosition;

			swfBytes.writeInt(frameCount*1152);

			swfBytes.position=currentPos;

			for(i=0;i<SoundClassSwfByteCode.soundClassSwfBytes3.length;++i)

			{

				swfBytes.writeByte(SoundClassSwfByteCode.soundClassSwfBytes3[i]);

			}

			swfBytes.position=swfSizePosition;

			swfBytes.writeInt(swfBytes.length);

			swfBytes.position=0;

			var swfBytesLoader:Loader=new Loader();

			swfBytesLoader.contentLoaderInfo.addEventListener(Event.COMPLETE,swfCreated);

			swfBytesLoader.loadBytes(swfBytes);

			return true;

		}

		private function swfCreated(ev:Event):void

		{



			var loaderInfo:LoaderInfo=ev.currentTarget as LoaderInfo;

			var soundClass:Class=loaderInfo.applicationDomain.getDefinition("SoundClass") as Class;

			var sound:Sound=new soundClass();

			dispatchEvent(new MP3SoundEvent(MP3SoundEvent.COMPLETE,sound));

			

		}



	}

}