Forked from:: TheCoolMuseum's mp3 可変速再生

forked from: mp3 可変速再生

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license : All rights reserved
modified : 2012-02-03 13:28:59

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// forked from TheCoolMuseum's mp3 可変速再生
package  
{
    import flash.display.*;
    import flash.media.*;
    import flash.events.*;
    import flash.events.SampleDataEvent;
    import flash.net.*;
    import flash.utils.ByteArray;
    
    public class ElasticSample extends Sprite
    {
        
        //private var loadData:String = "http://thecoolmuseum.cool.ne.jp/media/intro.mp3";
        //private var loadData:String = "http://thecoolmuseum.cool.ne.jp/media/intro2.mp3";
        private var loadData:String = "http://thecoolmuseum.cool.ne.jp/media/intro3.mp3";
        //private var loadData:String = "http://thecoolmuseum.cool.ne.jp/music/future.mp3";

private var source:Sound = new Sound();
        private var sound:Sound = new Sound();
        
        private var sampleTable:ByteArray = new ByteArray();
        private var delayBuffer:ByteArray = new ByteArray();
        
        private var bufferLength:int = 2048;
        private var delayTime:int = 300;
            
        public function ElasticSample() 
        {
            source.addEventListener(Event.COMPLETE, loadComplete);
            source.load(new URLRequest(loadData));
        }

private function player(event:SampleDataEvent):void {
            var speed:Number = (stage.mouseX - stage.stageWidth/2) / stage.stageWidth*4;
            var level:Number = (stage.mouseY - stage.stageHeight/2) / stage.stageHeight;
            var pos:Number = sampleTable.position / 8;
            var length:Number = sampleTable.length / 8;
            for (var i:int = 0; i < bufferLength; i++ ) {
                pos += speed;
                if (pos > length-1 && speed>0)
                {
                    pos += 2;
                    pos %= length;
                }
                if (pos <= 0 && speed<0)
                {
                    pos %= length;
                    pos += length - 1;
                }
                
                sampleTable.position = Math.round(pos) * 8;
                var left:Number = sampleTable.readFloat() + delayBuffer.readFloat() * level;
                var right:Number = sampleTable.readFloat() + delayBuffer.readFloat() * level;
                delayBuffer.position -= 8;
                delayBuffer.writeFloat(left);
                delayBuffer.writeFloat(right);
                if (delayBuffer.position >= delayBuffer.length - 8)
                {
                    delayBuffer.position = 0;
                }
                event.data.writeFloat(left*0.25);
                event.data.writeFloat(right * 0.25);
            }
        }
        
        private function loadComplete(event:Event):void
        {
            graphics.lineStyle(1);
            graphics.moveTo(0, stage.stageHeight / 2);
            graphics.lineTo(stage.stageWidth, stage.stageHeight / 2);
            graphics.moveTo(stage.stageWidth/2, 0);
            graphics.lineTo(stage.stageWidth/2, stage.stageHeight);
            graphics.drawRect(stage.stageWidth/4,stage.stageHeight/4,stage.stageWidth/2,stage.stageHeight/2)
        
            for (var i:int = 0; i < delayTime / 1000 * 44100; i++ ){
                delayBuffer.writeFloat(0);
                delayBuffer.writeFloat(0);
            }
            delayBuffer.position = 0;
            
            sampleTable.position = 0;
            source.extract(sampleTable, source.length / 1000 * 44100, 0);
            sampleTable.position = 0;
                sound.addEventListener("sampleData", player);
            trace("play");
            sound.play();
        }
    }
    
}

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