首先是国外某网站的一个简单，但最经典的波形图
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var url:String = "http://www.helpexamples.com/flash/sound/song3.mp3";
var request:URLRequest = new URLRequest(url);
var s:Sound = new Sound();
s.addEventListener(Event.COMPLETE, completeHandler);
s.load(request);
var song:SoundChannel = s.play();
song.addEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);
var ba:ByteArray = new ByteArray();
var gr:Sprite = new Sprite();
gr.x = 20;
gr.y = 200;
addChild(gr);
var time:Timer = new Timer(50);
time.addEventListener(TimerEvent.TIMER, timerHandler);
time.start();
function completeHandler(event:Event):void {
event.target.play();
}
function soundCompleteHandler(event:Event):void {
time.stop();
}
function timerHandler(event:TimerEvent):void {
SoundMixer.computeSpectrum(ba, true);
var i:int;
gr.graphics.clear();
gr.graphics.lineStyle(0, 0xFF0000);
gr.graphics.beginFill(0xFF0000);
gr.graphics.moveTo(0, 0);
var w:uint = 2;
for (i=0; i<512; i+=w) {
var t:Number = ba.readFloat();
var n:Number = (t * 100);
gr.graphics.drawRect(i, 0, w, -n);
}
}
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package {
//导入类
//Sprite是一个只有一帧的MovieClip,相对于MovieClip少了帧和场景...
import flash.display.Sprite;
//事件类
import flash.events.*;
//声音类
import flash.media.Sound;
//混音器类
import flash.media.SoundMixer;
//声音通道类(暂时这么翻吧)
import flash.media.SoundChannel;
//URLRequest类
import flash.net.URLRequest;
//二进制数组类
import flash.utils.ByteArray;
//定义类
public class SwfdongSound extends Sprite {
//声明MP3路径
private var url:String = "MySound.mp3";
//声明一个Sound对象
private var DongSound:Sound = new Sound();
//声明一个SoundChannel对象
private var sChannel:SoundChannel;
//声明一个ByteArray对象
private var bArray:ByteArray = new ByteArray();
//声明一个数组对象
private var Ary:Array;
//声明一个数字对象
private var n:Number = 0;
//初始化函数
public function SwfdongSound() {
var req:URLRequest = new URLRequest(url);
DongSound.load(req);
//播放
DongSound.play();
//添加一个EnterFrame的侦听器,同以前的this.onEnterFrame=showBar();
this.addEventListener(Event.ENTER_FRAME,showBar);
}
private function showBar(event:Event){
n = 0;
//清除绘图
this.graphics.clear();
//将当前声音输出为ByteArray
SoundMixer.computeSpectrum(bArray,true,0);
for(var i=0; i < 256; i=i+16){
//在ByteArray中读取一个32位的单精度浮点数(这个是livedoc上写的,实际就是把数据流读取成浮点数)
n = bArray.readFloat();
//这个实际作用是把n扩大一下
var num:Number = n*360;
//设置线条样式,颜色湖蓝,宽度10,透明度100
this.graphics.lineStyle(10,0x99FF00,100,false,"noSacle","none");
//移动到x坐标50+i,y坐标200的位置
this.graphics.moveTo(50+i,200);
//向上画图
this.graphics.lineTo(50+i,200-num/5);
}
}
}
}
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