很有用的音频波型图

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 PLOT_HEIGHT:int = 200;

const CHANNEL_LENGTH:int = 256;

var snd:Sound = new Sound();

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

snd.load(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, false, 0);

 var g:Graphics = this.graphics;

 g.clear();

 g.lineStyle(0, 0x6600CC);

 g.beginFill(0x6600CC);

 g.moveTo(0, PLOT_HEIGHT);

 var n:Number = 0;

 // left channel

 for (var i:int = 0; i < channel_length;="" i++)="">

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

  g.lineTo(i * 2, PLOT_HEIGHT - n);

 }

 g.lineTo(CHANNEL_LENGTH * 2, PLOT_HEIGHT);

 g.endFill();// right channel

 g.lineStyle(0, 0xCC0066);

 g.beginFill(0xCC0066, 0.5);

 g.moveTo(CHANNEL_LENGTH * 2, PLOT_HEIGHT);

 for (i = CHANNEL_LENGTH; i > 0; i--) {

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

  g.lineTo(i * 2, PLOT_HEIGHT - n);

 }

 g.lineTo(0, PLOT_HEIGHT);

 g.endFill();

}

function onPlaybackComplete(event:Event) {

 removeEventListener(Event.ENTER_FRAME, onEnterFrame);

}