Java Media Framework - MP3 Issues

问题

Im using Windows 7 and can "Java Platform SE Binary" in my sound mixer but yet still no sound seems to play.

My code is:

import javax.media.*;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.MalformedURLExc;

public class SimpleAudioPlayer {
private Player audioPlayer = null;

public SimpleAudioPlayer(URL url) throws IOException, NoPlayerException, 
    CannotRealizeException {
    audioPlayer = Manager.createRealizedPlayer(url);
}

public SimpleAudioPlayer(File file) throws IOException, NoPlayerException, 
    CannotRealizeException {
    this(file.toURL());
}

public void play() {
    audioPlayer.start();
}

public void stop() {
    audioPlayer.stop();
    audioPlayer.close();
}

public static void main(String[] args) {
    try{
        File audioFile = new File("/t.mp3");
        SimpleAudioPlayer player = new SimpleAudioPlayer(audioFile);

        System.out.println();
        System.out.println("-> Playing file '" + 
                           audioFile.getAbsolutePath() + "'");
        System.out.println("   Press the Enter key to exit");
        player.play();

        // wait for the user to press Enter to proceed.
        System.in.read();
        System.out.println("-> Exiting");
        player.stop();
    }catch(Exception ex){
        ex.printStackTrace();
    }

    System.exit(0);

}
}

I use the Windows Preformance JMF edition. The MP3 im trying to play works fine in VLC/WMP so it cant be the file.

The code also throws no exceptions or error when running, it just doesnt seem to play the sound.

Is there something im missing? Like pulling the sound card? E.g. taking over it so i can play sound out of it?

Im overall aim is to to a MP3 streaming service using RTP/RTSP so any links,advice or tuturiols would be help as im currelnt using IBM JMF Tuturiol and Java Demo

Please ask if any more information is needed!

UPDATE-

Downloaded WAV FILE and it seemed to play, how can i make MP3s play?

Added formats and tried this code and still the same issue:

import java.io.File;
import javax.media.Format;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.media.PlugInManager;
import javax.media.format.AudioFormat;

public class SimpleAudioPlayer {
    public static void main(String[] args) {

        Format input1 = new AudioFormat(AudioFormat.MPEGLAYER3);
        Format input2 = new AudioFormat(AudioFormat.MPEG);

        Format output = new AudioFormat(AudioFormat.LINEAR);
        PlugInManager.addPlugIn(
            "com.sun.media.codec.audio.mp3.JavaDecoder",
            new Format[]{input1, input2},
            new Format[]{output},
            PlugInManager.CODEC
        );
        try {
            Player player = Manager.createPlayer(new MediaLocator(new File("/t.mp3").toURI().toURL()));
            player.start();
        }
        catch(Exception ex) {
            ex.printStackTrace();
        }
    }
}

Unable to handle format: mpeglayer3, 44100.0 Hz, 16-bit, Stereo, LittleEndian, Signed, 16000.0 frame rate, FrameSize=32768 bits Failed to realize: com.sun.media.PlaybackEngine@62deaa2e Error: Unable to realize com.sun.media.PlaybackEngine@62deaa2e

Thats the error!

回答1:

As I thought, it's a missing codec.

I think this is what you need: http://www.oracle.com/technetwork/java/javase/download-137625.html

来源：https://stackoverflow.com/questions/16080606/java-media-framework-mp3-issues