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package {
import flash.utils.ByteArray;
import flash.events.*;
import flash.net.*;
import flash.display.*;
import flash.media.*;
import flash.geom.*;
public class Main extends Sprite {
private const SPECTRUM_WIDTH:int = 256;
private const BMP_HEIGHT:int = 200;
private const BMP_WIDTH:int = 256;
private var sound:Sound = new Sound(new URLRequest("http://www.java2s.com/y.mp3"));
private var soundData:ByteArray;
private var bitmapData:BitmapData;
private var bitmapDisplay:Bitmap;
public function Main () {
sound.play();
bitmapData = new BitmapData(BMP_WIDTH, BMP_HEIGHT, true, 0x00000000);
bitmapDisplay = new Bitmap(bitmapData);
addChild(bitmapDisplay);
this.addEventListener(Event.ENTER_FRAME, onEnterFrame);
}
public function onEnterFrame (event:Event):void {
soundData = new ByteArray();
SoundMixer.computeSpectrum(soundData);
bitmapData.fillRect(bitmapData.rect, 0xFF000000);
for (var i:int=0; i < SPECTRUM_WIDTH; i++) {
var amplitude:Number = soundData.readFloat();
var ampHeight:Number = BMP_HEIGHT/2 * (amplitude + 1);
var rect:Rectangle = new Rectangle(i, BMP_HEIGHT -ampHeight, 1, ampHeight);
bitmapData.fillRect(rect, 0xffffffff);
}
}
}
}
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