Play MP3 or OGG using javax.sound.sampled, mp3spi, vorbisspi

I tried to come up with the simplest possible way of writing a Java class that can play mp3 and ogg files, using standard Java Sound APIs, with purely Open Source libraries from the public Maven Central repositories.

The LGPL-licensed mp3spi and vorbisspi libraries from javazoom.net satisfy these requirements and worked for me right away. As service provider implementations (SPI), they transparently add support for the mp3 and ogg audio formats to javax.sound.sampled, simply by being in the classpath.

For my AudioFilePlayer class below I basically took the example code from javazoom and simplified it as much as possible. Please note that it requires Java 7 as it uses try-with-resources.

Maven dependencies

  <!-- 
    We have to explicitly instruct Maven to use tritonus-share 0.3.7-2 
    and NOT 0.3.7-1, otherwise vorbisspi won't work.
   -->
<dependency>
  <groupId>com.googlecode.soundlibs</groupId>
  <artifactId>tritonus-share</artifactId>
  <version>0.3.7-2</version>
</dependency>
<dependency>
  <groupId>com.googlecode.soundlibs</groupId>
  <artifactId>mp3spi</artifactId>
  <version>1.9.5-1</version>
</dependency>
<dependency>
  <groupId>com.googlecode.soundlibs</groupId>
  <artifactId>vorbisspi</artifactId>
  <version>1.0.3-1</version>
</dependency>

AudioFilePlayer.java

package net.doepner.audio;

import java.io.File;
import java.io.IOException;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine.Info;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.UnsupportedAudioFileException;

import static javax.sound.sampled.AudioSystem.getAudioInputStream;
import static javax.sound.sampled.AudioFormat.Encoding.PCM_SIGNED;

public class AudioFilePlayer {

    public static void main(String[] args) {
        final AudioFilePlayer player = new AudioFilePlayer ();
        player.play("something.mp3");
        player.play("something.ogg");
    }

    public void play(String filePath) {
        final File file = new File(filePath);

        try (final AudioInputStream in = getAudioInputStream(file)) {
            
            final AudioFormat outFormat = getOutFormat(in.getFormat());
            final Info info = new Info(SourceDataLine.class, outFormat);

            try (final SourceDataLine line =
                     (SourceDataLine) AudioSystem.getLine(info)) {

                if (line != null) {
                    line.open(outFormat);
                    line.start();
                    stream(getAudioInputStream(outFormat, in), line);
                    line.drain();
                    line.stop();
                }
            }

        } catch (UnsupportedAudioFileException 
               | LineUnavailableException 
               | IOException e) {
            throw new IllegalStateException(e);
        }
    }

    private AudioFormat getOutFormat(AudioFormat inFormat) {
        final int ch = inFormat.getChannels();
        final float rate = inFormat.getSampleRate();
        return new AudioFormat(PCM_SIGNED, rate, 16, ch, ch * 2, rate, false);
    }

    private void stream(AudioInputStream in, SourceDataLine line) 
        throws IOException {
        final byte[] buffer = new byte[65536];
        for (int n = 0; n != -1; n = in.read(buffer, 0, buffer.length)) {
            line.write(buffer, 0, n);
        }
    }
}

Advertisement