as 3.0 播放音乐的实例代码

 package
{
    import flash.display.sprite;
    import flash.events.event;
    import flash.events.sampledataevent;
    import flash.media.sound;
    import flash.utils.bytearray;
    /**
     * @author flash023
     * @date 2010-7-31 18:27
    **/
    public class ps教程ound extends sprite 
    {
        private var len:uint;
        private var position:int;
        private var sound:sound;
        private var sounddata:bytearray;
        public function psound():void {
            stage?init(null):addeventlistener (event.added_to_stage, init);
        }
        private function init(e:event ):void {
            var tempsound:rpsound=new rpsound  ;
            sounddata =new bytearray  ;
            tempsound.extract(sounddata,999999999);//获取音乐数据
            len=sounddata.length;
            position=int(len/8)-8;
            sound = new sound  ;
            sound.addeventlistener(sampledataevent.sample_data,onsampledata);
            sound.play();
            //
            removeeventlistener(event.added_to_stage, init);
        }
        private function onsampledata(e:sampledataevent):void {
            var _i:int=2048;
            while (_i--) {
                sounddata.position=position*8;//重新采样,这里也可以改一改,搞成控制速度,改变采样率等效果
                e.data.writefloat(sounddata.readfloat());
                e.data.writefloat(sounddata.readfloat());
                position--;       
                if (position<0) {
                    trace("声音播放完了");
                    return;
                    //position=int(len/8)-8;
                }
            }
            //trace(position);
        }
    }

   
}