MP3.java

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package micropolisj.util;

/*************************************************************************
 *  Compilation:  javac -classpath .:jl1.0.jar MP3.java         (OS X)
 *                javac -classpath .;jl1.0.jar MP3.java         (Windows)
 *  Execution:    java -classpath .:jl1.0.jar MP3 filename.mp3  (OS X / Linux)
 *                java -classpath .;jl1.0.jar MP3 filename.mp3  (Windows)
 *  
 *  Plays an MP3 file using the JLayer MP3 library.
 *
 *  Reference:  http://www.javazoom.net/javalayer/sources.html
 *
 *
 *  To execute, get the file jl1.0.jar from the website above or from
 *
 *      http://www.cs.princeton.edu/introcs/24inout/jl1.0.jar
 *
 *  and put it in your working directory with this file MP3.java.
 *
 *************************************************************************/

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.net.URL;

import javazoom.jl.player.advanced.AdvancedPlayer;
import javazoom.jl.player.advanced.PlaybackEvent;
import javazoom.jl.player.advanced.PlaybackListener;

public class MP3 extends PlaybackListener {
        private String filename;
        private AdvancedPlayer player;
        private boolean loop;
        private volatile Thread thread;

        // CONSTRUCTORS
        public MP3(String filename) {
                this(filename, false);
        }

        public MP3(URL url) {
                this(url, false);
        }

        public MP3(URL url, boolean loop) {
                this(url.toString().substring(5), loop);
//              this(url.toString(), loop);
        }

        public MP3(String filename, boolean loop) {
                this.filename = filename;
                this.player = null;
                this.loop = loop;
                this.thread = null;
        }

        // METHODS

        public void close() {
                if(player != null) {
                        player.close();
                }

                if(thread != null) {
                        thread.interrupt();
                        thread = null;
                }
        }

        public AdvancedPlayer createPlayer() {
                close();
                try {
                        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(filename));
                        AdvancedPlayer p = new AdvancedPlayer(bis);

                        if(loop) {
                                p.setPlayBackListener(new LoopListener());
                        }
                        else {
                                p.setPlayBackListener(new NonLoopListener());
                        }
                        return p;
                }
                catch(Exception e) {
                        System.out.println("Problem with file " + filename);
                        System.out.println(e);
                        return null;
                }
        }

        // play the MP3 file to the sound card
        public void play() {
                player = createPlayer();
                // run in new thread to play in background
                thread = new Thread() {
                        public void run() {
                                try {
                                        player.play();
                                }
                                catch(Exception e) {
                                        System.err.println(e);
                                }
                        }
                };
                thread.start();
        }

        private class LoopListener extends PlaybackListener {
                @Override
                public void playbackFinished(PlaybackEvent evt) {
                        play();
                }
        }

        private class NonLoopListener extends PlaybackListener {
                @Override
                public void playbackFinished(PlaybackEvent evt) {
                        thread.interrupt();
                        thread = null;
                }
        }
}