FLASH CS4中的声音处理

/*
As3Sound.as
*/
package {
        import flash.display.Sprite;
        import flash.events.*;
        import flash.media.Sound;
        import flash.media.SoundChannel;
        import flash.net.URLRequest;
        import flash.utils.Timer;
        import flash.text.TextField;
        import flash.text.TextFieldAutoSize;
        import flash.filters.DropShadowFilter;
  
        public class As3Sound extends Sprite
  {
                private var url:String = "http://sxl001.xfyun.com/music/lib/myRussia.mp3";
                private var soundFactory:Sound;
                private var channel:SoundChannel;
                private var positionTimer:Timer;
                private var play_btn:Sprite;
                private var stop_btn:Sprite;
                private var d_filtersropShadowFilter=new DropShadowFilter(5,45,0x000000,80,8,8);
                //用于记录音乐现在是否为暂停状态
                private var bSoundStop:Boolean = false;
                public function As3Sound()
    {
                        var sxl_txt:TextField = new TextField();
                        sxl_txt.text="CS4中如何控制声音的播放或停止的";
                        sxl_txt.autoSize=TextFieldAutoSize.LEFT;
                        sxl_txt.x=stage.stageWidth/2-sxl_txt.width/2;
                        sxl_txt.y=20;
                        addChild(sxl_txt);
                        var mp3_request:URLRequest = new URLRequest(url);
                        soundFactory = new Sound();
                        //成功加载数据后
                        soundFactory.addEventListener(Event.COMPLETE, completeHandler);
                        //在存在可用于 MP3 声音的 ID3 数据时
                        soundFactory.addEventListener(Event.ID3, id3Handler);
                        //加载音乐错误时
                        soundFactory.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
                        //音乐加载中...
                        soundFactory.addEventListener(ProgressEvent.PROGRESS, progressHandler);
                        soundFactory.load(mp3_request);
                        channel = soundFactory.play();
                        //音乐播放完成
                        channel.addEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);
                        //用Timer监听音乐的播放进度
                        positionTimer = new Timer(1000);
                        positionTimer.addEventListener(TimerEvent.TIMER, positionTimerHandler);
                        positionTimer.start();
                        //创建一个按钮，用于播放音乐
                        play_btn = new Sprite();
                        play_btn.graphics.beginFill(0xFFCC32);
                        play_btn.graphics.drawRoundRect(0, 0, 70, 18, 10, 10);
                        play_btn.graphics.endFill();
                        var play_txt:TextField = new TextField();
                        play_txt.text = "播放";
                        play_txt.x=18;
                        play_btn.x=50;
                        play_btn.y=100;
                        play_txt.selectable = false;
                        play_btn.addChild(play_txt);
                        play_btn.filters=[d_filters];
                        play_btn.addEventListener(MouseEvent.CLICK, soundPlay);
                        addChild(play_btn);
                        //创建一个按钮，用于停止音乐
                        stop_btn = new Sprite();
                        stop_btn.graphics.beginFill(0xFFCC32);
                        stop_btn.graphics.drawRoundRect(0, 0, 70, 18, 10, 10);
                        stop_btn.graphics.endFill();
                        stop_btn.x=130;
                        stop_btn.y=100;
                        var stop_txt:TextField = new TextField();
                        stop_txt.x=18;
                        stop_txt.text = "暂停";
                        stop_txt.selectable = false;
                        stop_btn.addChild(stop_txt);
                        stop_btn.filters=[d_filters];
                        stop_btn.addEventListener(MouseEvent.CLICK, soundStop);
                        addChild(stop_btn);

                }
                //监听音乐的播放进度
                private function positionTimerHandler(event:TimerEvent):void
    {
                        var ybf:int = channel.position.toFixed(0);
                        var zcd:int = soundFactory.length;
                        var bfs:int = Math.floor(ybf/zcd*100);
                        //trace("音乐总长度："+zcd, "音乐已播放："+ybf, "播放进度为："+bfs+"%");
                }
                //加载音乐完成时
                private function completeHandler(event:Event):void
    {
                        //trace("加载音乐完成: " + event);
                }
                //在存在可用于MP3声音的ID3数据时
                private function id3Handler(event:Event):void
    {
                        //trace("音乐的ID3信息如下:");
                        for (var s in soundFactory.id3)
      {
                                //trace("\t", s, ":", soundFactory.id3[s]);
                        }
                        //trace("关于ID3信息介绍，请参见Sound类-->属性-->id3");
                }
                //加载音乐错误时
                private function ioErrorHandler(event:Event):void
    {
                        //trace("加载音乐错误，错误信息如下：" + event);
                        positionTimer.stop();
                }
                //加载音乐时
                private function progressHandler(eventrogressEvent):void
    {
                        var yjz:int = event.bytesLoaded;
                        var zcd:int = event.bytesTotal;
                        var bfs:int = Math.floor(yjz/zcd*100);
                        //trace("音乐总长度："+zcd,"已加载: "+yjz, "加载进度为："+bfs+"%");
                }
                //音乐播放完成
                private function soundCompleteHandler(event:Event):void
    {
                        //trace("音乐播放完成: " + event);
                        positionTimer.stop();
                }
                //点击播放按钮事件
                private function soundPlay(event:MouseEvent):void
    {
                        if (bSoundStop)
      {
                                bSoundStop = false;
                                channel = soundFactory.play(channel.position.toFixed(0));
                        }
                }
                //点击停止按钮事件
                private function soundStop(event:MouseEvent):void
    {
                        if (!bSoundStop)
      {
                                bSoundStop = true;
                                channel.stop();
                        }
                }
        }
}