[as3]AS3写的一个MP3音乐播放器源代码

[as3]AS3写的一个MP3音乐播放器源代码

代码 
 
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package  { 
        import flash.media.Sound; 
        import flash.media.SoundChannel; 
        import flash.media.SoundLoaderContext; 
        import flash.media.SoundMixer; 
 
        public class MediaPlayerCore { 
                private var sound:Sound; 
                private var soundCh:SoundChannel; 
                private var soundCon:SoundLoaderContext; 
                private var position:Number; 
                private var isPlaying:Boolean; 
                private var isPause:Boolean; 
                private static var BUFFERTIME:Number = 10000; 
                         
                public function MediaPlayerCore() 
                { 
                        isPause = false; 
                        isPlaying = false; 
                        SoundMixer.bufferTime = BUFFERTIME;  
                } 
               //创建一个声音对象 
                 //@param url 媒体地址 
                 // @param playNow 是否马上播放，默认为真       
                public function createSound(url:String,playNow:Boolean = true):void 
                {                         
                        dispose(); 
                        sound = new Sound(); 
                        sound.load(new URLRequest(url)); 
                        sound.addEventListener(IOErrorEvent.IO_ERROR,errorHandler);              
                        if(playNow) 
                                play();                             
                } 
                //播放 
                  //@param offset 声音从哪开始       
                public function play(offset:Number = 0):void 
                { 
                        if(isPause) 
                                soundsoundCh = sound.play(position); 
                        else 
                                soundsoundCh = sound.play(offset); 
                        isPlaying = true; 
                        isPause = false; 
                } 
               //暂停         
                public function pause():void 
                { 
                        if(isPlaying) 
                        {                         
                                position = soundCh.position; 
                                stop();         
                                isPause = true; 
                        } 
                } 
                //停止         
                public function stop():void 
                { 
                        if(isPlaying) 
                        { 
                                soundCh.stop(); 
                                isPlaying = false;                                 
                        } 
                } 
                //播放位置         
                public function get Position():Number 
                { 
                        if(soundCh == null) 
                                return 0;                     
                        return Math.round(soundCh.position); 
                } 
                //声音对象长度         
                public function get Length():Number 
                { 
                        if(sound == null) 
                                return 0; 
                        return Math.round(sound.length*sound.bytesTotal/sound.bytesLoaded); 
                } 
                //声音对象总共字节         
                public function get BytesTotal():Number 
                { 
                        if(sound == null) 
                                return 0; 
                        return sound.bytesTotal; 
                } 
                //声音对象加载字节         
                public function get BytesLoaded():Number 
                { 
                        if(sound == null) 
                                return 0; 
                        return sound.bytesLoaded; 
                } 
                //设置缓冲时间         
                public function set BufferTime(time:Number):void 
                { 
                        SoundMixer.bufferTime=time; 
                } 
               //中途换歌的时候用的 
                private function dispose():void 
                { 
                        if(sound == null) 
                                return ; 
                        if(sound.isBuffering) 
                                sound.close(); 
                        stop();                  
                        sound = null; 
                } 
               // 处理错误用 
                private function errorHandler(e:IOErrorEvent):void 
                { 
                        sound.removeEventListener(IOErrorEvent.IO_ERROR,errorHandler); 
                        sound = null; 
                }                 
        } 
}