[转] 一个使用SoundMixer的炫酷频分析
http://bbs.9ria.com/viewthread.php?tid=77229&extra=page%3D1%26amp%3Borderby%3Ddateline%26amp%3Bfilter%3D2592000http://dl.iteye.com/upload/attachment/449208/e45066a6-8f75-3e31-92b7-a0e549c7e086.jpg
package {/**引入绘图类，用于绘制圆圈*引入基本事件类*引入鼠标事件类，用于监听鼠标的点击*引入声音类，用于播放音乐*引入声音混音器类，用于获取flash当前播放声音的各个频段的分量*引入图形类*引入URL请求类，用于请求MP3文件*引入图像滤镜质量类，用于设置各个滤镜的渲染质量*引入模糊滤镜类*引入发光滤镜类*引入字节数组类*/import flash.display.Graphics;import flash.events.Event;import flash.events.MouseEvent;import flash.media.Sound;import flash.media.SoundMixer;import flash.net.URLRequest;import flash.display.Sprite;import flash.filters.BitmapFilterQuality;import flash.filters.BlurFilter;import flash.filters.GlowFilter;import flash.utils.ByteArray;public class SoundMixerExample extends Sprite {private var req:URLRequest;private var soundFactory:Sound;private var method:uint;private var mainSprite:Sprite;private var getParme:Function;public function SoundMixerExample() {play_btn.addEventListener(MouseEvent.CLICK, playClickHandler);change_btn.addEventListener(MouseEvent.CLICK, changeClickHandler);}private function playClickHandler(event:MouseEvent):void {method=0;getParme=getParmeMethod0;mainSprite=new Sprite();this.addChild(mainSprite);change_sprite.addEventListener(MouseEvent.CLICK, changeClickHandler);soundFactory=new Sound();req=new URLRequest(path.text.replace("\r","").replace("\n",""));soundFactory.load(req);soundFactory.play();this.addEventListener(Event.ENTER_FRAME, onEnterFrame);}private function changeClickHandler(event:MouseEvent):void {method=++method%3;switch (method) {case 0 :getParme=getParmeMethod0;mainSprite.mask=null;break;case 1 :getParme=getParmeMethod1;mainSprite.mask=null;break;case 2 :getParme=getParmeMethod2;mainSprite.mask=mainMask;break;}}private function getGlowFilter(color) {var alpha:Number=1;var blurX:Number=30;var blurY:Number=30;var strength:Number=15;var inner:Boolean=false;var knockout:Boolean=false;var quality:Number=3;return new GlowFilter(color, alpha, blurX, blurY, strength, quality, inner, knockout);}private function getBlurFilter() {var blurX:Number=0;var blurY:Number=3;return new BlurFilter(blurX, blurY, BitmapFilterQuality.HIGH);}private function onEnterFrame(event:Event):void {const PLOT_HEIGHT:int=50;const CHANNEL_LENGTH:int=64;const STEP=128/CHANNEL_LENGTH;var bytes:ByteArray = new ByteArray();SoundMixer.computeSpectrum(bytes, true, 0);var g:Graphics=mainSprite.graphics;g.clear();var n:Number=0;// left channelfor (var i:int = 0; i < CHANNEL_LENGTH; i+=STEP) {g.lineStyle(0,Math.floor(0x111111*bytes.readFloat()*16));var parme=getParme(i);g.drawCircle(parme,parme,Math.pow(bytes.readFloat()+0,2)*PLOT_HEIGHT);}// right channelg.moveTo(CHANNEL_LENGTH * 2, PLOT_HEIGHT);for (i = CHANNEL_LENGTH; i > 0; i-=STEP) {g.lineStyle(0,Math.floor(0x11111111*bytes.readFloat()*16));parme=getParme(i);g.drawCircle(parme,parme-100,Math.pow(bytes.readFloat()+0,2)*PLOT_HEIGHT);}g.endFill();mainSprite.filters=new Array(getBlurFilter(),getGlowFilter(Math.floor(0x11111111*bytes.readFloat()*16)));}private function getParmeMethod0(num:Number) {return new Array(10*num+100,200);}private function getParmeMethod1(num:Number) {return new Array(10*Math.random()*45+175,220);}private function getParmeMethod2(num:Number) {return new Array(Math.random()*550+125,400*Math.random());}}}
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