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();
}
}
}