如何使用FileReference播放声音?

时间:2013-08-23 06:42:56

标签: actionscript-3 flash flex flex3

我构建一个flex应用程序来播放声音。我使用FileReference来浏览mp3文件。如何使用SoundReference对象使用Sound Class的播放方法播放该文件。或者我可以将该FileReference对象中的数据加载到byteArray中。可以使用Sound Class播放byteArray吗?谢谢

2 个答案:

答案 0 :(得分:1)

如果您正在使用FileReference将mp3文件加载到Sound对象中,那么它将无法正常播放,因为数据已被压缩(音频将是噪音)。

无论如何,还有一个替代的代码库也可以解决您的问题...: http://flexiblefactory.co.uk/flexible/?p=46

在文章中,您还可以找到此zip文件的链接:
http://www.flexiblefactory.co.uk/flexible/wp-content/uploads/mp3filereferenceloaderlib.zip

我不使用Flex但是要在Flash CS中设置我会进入zip文件并将org文件夹文件复制到我的项目文件夹(作为子文件夹),然后在.as文件和FLA中使用下面的代码那是舞台。

您还需要创建三个精灵或MovieCips以用作按钮。

  • 文件打开(实例名称:btn_open)
  • 播放(实例名称:btn_play)
  • 停止(实例名称:btn_stop)

* AS3代码*

package  
{

import flash.display.MovieClip;
import flash.events.MouseEvent;
import flash.events.Event;
import flash.events.IOErrorEvent;
import flash.net.FileFilter;
import flash.net.FileReference;
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.net.URLLoaderDataFormat;
import flash.utils.ByteArray;
import flash.media.Sound;
import flash.media.SoundChannel;

import org.audiofx.mp3.MP3FileReferenceLoader;
import org.audiofx.mp3.MP3SoundEvent;


public class MP3_fileRef_test extends MovieClip 

{
    private var loader:MP3FileReferenceLoader;
    private var fileReference:FileReference;
    public var _loadedsound:Sound = new Sound;
    public var channel_obj:SoundChannel = new SoundChannel();
    public var mp3_isPlaying:Boolean;


    public function MP3_fileRef_test() 
    {
        mp3_isPlaying = false;

        btn_open.buttonMode = true;
        btn_open.addEventListener(MouseEvent.CLICK, mp3Open_handler);

        btn_play.buttonMode = true;
        btn_play.addEventListener(MouseEvent.CLICK, audio_play);

        btn_stop.buttonMode = true;
        btn_stop.addEventListener(MouseEvent.CLICK, audio_stop);

        loader = new MP3FileReferenceLoader();
        loader.addEventListener(MP3SoundEvent.COMPLETE, mp3Loader_Complete);

        fileReference=new FileReference();
        fileReference.addEventListener(Event.SELECT,fileReferenceSelectHandler);
    }

    //OPEN BROWSE WINDOW & TRIGGER EVENT FUNCTION fileReferenceSelectHandler 
    private function mp3Open_handler (ev:MouseEvent):void
    {
        fileReference.browse( [new FileFilter("mp3 files","*.mp3")] );
    }

    private function fileReferenceSelectHandler(e:Event):void
    {
        loader.getSound(fileReference);
    }

    private function mp3Loader_Complete (loader_mp3Data:MP3SoundEvent):void
    {
        //CHECK IF THERE'S A PREVIOUSLY OPENED FILE PLAYING
        //OTHERWISE WILL BE MULTIPLE SOUNDS PLAYING OVER EACH OTHER
        if (mp3_isPlaying == true)
        {
            channel_obj.stop();
            mp3_isPlaying = false;
        }

        _loadedsound = new Sound;
        _loadedsound.addEventListener(Event.COMPLETE, soundLoad_Complete);

        //PUT (MP3SoundEvent) LOADER DATA INTO NEW _loadedsound SOUND OBJECT
        _loadedsound = loader_mp3Data.sound;

        //UNLOCK BELOW FOR AUTO-START WITHOUT PRESSING PLAY BUTTON
        //channel_obj = _loadedsound.play(); //auto
        //mp3_isPlaying = true; //auto
    }

    //WHEN SOUND IS LOADED AND READY FOR USE
    function soundLoad_Complete(e:Event):void
    {
        //Do whatever else is needed on successful  load
        //eg: trace or update status text, make an MC visible etc
    }

    //PLAY AUDIO ON CLICK
    function audio_play (e:MouseEvent):void 
    {
        if (mp3_isPlaying == false)
        {
            channel_obj = _loadedsound.play();
            mp3_isPlaying = true;
        }
    }

    //STOP AUDIO ON CLICK   
    function audio_stop (e:MouseEvent):void 
    {
        if (mp3_isPlaying == true)
        {
            channel_obj.stop();
            mp3_isPlaying = false;
        }
    }


}//END CLASS

}//END PACKAGE

希望它有所帮助。和平我不在这里......

答案 1 :(得分:0)

应该可以。首先从FileReference加载mp3,然后实例化new Sound(),然后调用loadCompressedDataFromByteArray(loadedBytes,loadedBytes.length)然后播放它。如果没有FileReference完成,请不要忘记将有问题的ByteArray倒回到起始位置,因为此函数使用当前位置作为文件的开头。

The manual.

更新:如果您使用的是Flash Player 10,则此方法不可用。为此,请尝试从URLRequest创建FileReference.name,然后通过此伪造请求加载声音。

var ur:URLRequest=new URLRequest(fileRef.name);
var snd:Sound=new Sound(ur);
snd.addEventListener(Event.COMPLETE,sndLoaded);

然后您处理已加载的声音。