flash9制作播放音乐时使频谱真实显示的代码

• flash9制作
• 频谱真实显示
• 代码

(需要首先将mp3转换为swf,再对转换后的swf进行处理,才能正确显示声音频谱),可以说Flash8及以下的版本对声音的支持是有限的,而Flash9在此方面进行了升级,对声音的处理能力大为提升,下面发一个用flash9制作的播放音乐时频谱真实显示的小实例(参考了他人心得),界面如下图1:

1.打开Flash9,在主场景第一帖上(仅此一帧):

import flash.display.Sprite;   

import flash.display.BlendMode;  //混合模式类  

import flash.events.*;   //事件类 

import flash.media.Sound;    //声音类 

import flash.media.SoundMixer;  //混音器类  

import flash.media.SoundChannel; //声道类   

import flash.net.URLRequest;    //URLRequest类

import flash.utils.ByteArray;   //ByteArray类 

import flash.display.Bitmap; //位图类

import flash.display.BitmapData; 

import flash.filters.BlurFilter; //滤镜类

import flash.filters.ColorMatrixFilter;  

import flash.filters.BitmapFilterQuality;  //滤镜品质类 

import flash.geom.Rectangle;    //矩形类

import flash.geom.Point;  //Point类(点)

Stage.showDefaultContextMenu = false;

//声明用来包含line和bg的Sprite

var Main:Sprite=new Sprite();

//声明用来画线的Sprite

var line:Sprite=new Sprite();

//声明用来放位图数据的BitmapData

var bmpData:BitmapData=new BitmapData(350,200,true,0xFF0000);

//声明用来显示效果的Bitmap

var bmp:Bitmap=new Bitmap(bmpData);

//声明一个ByteArray对象

var bArray:ByteArray = new ByteArray();

//声明一个数组对象

var Ary:Array;

//声明两个数字对象

var n:Number = 0;

var c:Number = 0;

//声明一个ColorMatrix滤镜

var colorM:ColorMatrixFilter=new ColorMatrixFilter([0.98,0,0,0,0,0,0.98,0,0,0,0,0,0.98,0,0,0,0,0,0.90,0,]);

//声明一个BlurFilter滤镜

var blur:BlurFilter = new BlurFilter(7,7,BitmapFilterQuality.LOW);

//声明一个矩形

var r:Rectangle=new Rectangle(0,0,350,200);

//声明一个点

var point=new Point(0,0);       

function showBar1(event:Event):void{

n = 0;

//这里是为了每2次才执行一次滤镜而做的if,如果需要让原来的波形图消失的更慢就把2改成更大的数字

if(c%2==0){

//将Main的内容绘制到bmpData

bmpData.draw(Main);

//应用滤镜

bmpData.applyFilter(bmpData,r,p,colorM);

bmpData.applyFilter(bmpData,r,p,blur);

}

c++;

//清除绘图

line.graphics.clear();

//设置线条样式,颜色green,宽度1,透明度100

line.graphics.lineStyle(1,0x00CC00,100);

//将当前声音输出为ByteArray,注意哦,这次用的是false,上次是true

SoundMixer.computeSpectrum(bArray,false,0);

for(var i=0; i<256; i+=2){

//在ByteArray中读取一个32位的单精度浮点数

n = bArray.readFloat();

//这个实际作用是把n扩大一下

n = n*360;

//如果i不为0

if(i!=0){

//画波形图

line.graphics.lineTo(50+i,100-n/5);

}else{

//移动    

line.graphics.moveTo(50,100-n/5);

}

}

}

//

play_btn.addEventListener(MouseEvent.MOUSE_DOWN,playSounds);

stop_btn.addEventListener(MouseEvent.MOUSE_DOWN,stopSounds);

pause_btn.addEventListener(MouseEvent.MOUSE_DOWN,pauseSounds);

var kaiguan:Boolean =false;

function playSounds(event:MouseEvent):void {

if(kaiguan){

_channel = _sound.play(_position);

kaiguan=false;

}

}

function stopSounds(event:MouseEvent):void {

//....设置为0位置才能使进度条归零.....

_channel = _sound.play(0);

//......停止声音的方法........

SoundMixer.stopAll( ); 

kaiguan=true;

}

function pauseSounds(event:MouseEvent):void {

if(!kaiguan) {

_position = _channel.position;

_channel.stop( );

kaiguan = !kaiguan;

}           

}

//

var _position:int =0;

this.addEventListener(Event.ENTER_FRAME, onEnterFrame);

function onEnterFrame(event:Event):void{ 

//..........进度条初始值.........................

var barWidth:int = 271;

var barHeight:int = 5; 

var loaded:int = _sound.bytesLoaded;

var total:int = _sound.bytesTotal;            

var length:int = _sound.length;

_position = _channel.position;

//................ 画进度条背景....................................

graphics.clear(  );

graphics.beginFill(0x333333);

graphics.drawRect(40, 187, barWidth, barHeight);

graphics.endFill(  );

//..................................................................

//.............时间显示设置区................................................

var miao:int=Math.round(length/1000)-Math.round(length/60000)*60;

var fen:int=Math.round(length/60000);

if(fen<10){

if(Math.abs(miao)<10){

musicTimer.text="0"+fen+":0"+ Math.abs(miao);

}else{

musicTimer.text="0"+fen+":"+ Math.abs(miao);}

}else{

if(Math.abs(miao)<10){

musicTimer.text=fen+":0"+ Math.abs(miao);

}else{

musicTimer.text=fen+":"+ Math.abs(miao);

}

}

var playmiao:int=_position/1000;

if(playmiao<60){

if(playmiao<10){

musicPlayingTimer.text="00:0"+playmiao;

}else{

musicPlayingTimer.text="00:"+playmiao;

}

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