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("月亮之上.mp3");　//配置聲音源文件地址(此為本地，可配置遠程)
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);
}