import flash.display.Graphics;

import flash.events.Event;

import flash.media.Sound;

import flash.media.SoundChannel;

import flash.media.SoundMixer;

import flash.net.URLRequest;

 

const HEIGHT:int = 100;

const LENGTH:int = 256;

 

var req:URLRequest = new URLRequest("music.mp3");

var snd:Sound = new Sound(req);

var channel:SoundChannel;

channel= snd.play();

addEventListener(Event.ENTER_FRAME, onEnterFrame);

snd.addEventListener(Event.SOUND_COMPLETE, onPlaybackComplete);

var bytes:ByteArray = new ByteArray();

 

function onEnterFrame(event:Event):void

{

   SoundMixer.computeSpectrum(bytes, true, 0);

   var g:Graphics = this.graphics;

   g.clear();

   g.lineStyle(0, 0x000000);

   var n:Number = 0;

   for (var i:int = 0; i < LENGTH; i++)

   {

      n = (bytes.readFloat() * HEIGHT);

      g.beginFill(0xffff00);

      g.drawRect (i*32, HEIGHT-n, 32, HEIGHT) ;

   }

}

function onPlaybackComplete(event:Event)

{

   removeEventListener(Event.ENTER_FRAME, onEnterFrame);

}