basicplayer出现这种提示,但没有声音.

Question

代码:
import java.io.File;import javazoom.jlgui.basicplayer.BasicPlayer;
import javazoom.jlgui.basicplayer.BasicPlayerException;public class PlayerTest {
        public static void main(String[] args) {
                try {
                        BasicPlayer player = new BasicPlayer();
                        File musicfile = new File("/home/jeff/桌面/02 I Knew I Loved You.mp3");
                        player.open(musicfile);
                        player.play();
                } catch (BasicPlayerException e) {
                }
        }
}出现的提示:
2008-2-25 21:34:25 javazoom.jlgui.basicplayer.BasicPlayer open
信息: open(/home/jeff/桌面/02 I Knew I Loved You.mp3)但没有声音,怎么回事?

Answer 1

这是BasicPlayer包中提供的测试类，你看一下嘛，可能有帮助。
/*
 * BasicPlayerTest.
 * 
 * JavaZOOM : [email protected]
 *            http://www.javazoom.net
 *
 *-----------------------------------------------------------------------
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as published
 *   by the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *----------------------------------------------------------------------
 */
package javazoom.jlgui.basicplayer;import java.io.File;
import java.io.PrintStream;
import java.util.Map;/**
 * This class implements a simple player based on BasicPlayer.
 * BasicPlayer is a threaded class providing most features
 * of a music player. BasicPlayer works with underlying JavaSound 
 * SPIs to support multiple audio formats. Basically JavaSound supports
 * WAV, AU, AIFF audio formats. Add MP3 SPI (from JavaZOOM) and Vorbis
 * SPI( from JavaZOOM) in your CLASSPATH to play MP3 and Ogg Vorbis file.
 */
public class BasicPlayerTest implements BasicPlayerListener
{
        private PrintStream out = null;

        /**
         * Entry point.
         * @param args filename to play.
         */
        public static void main(String[] args)
        {
                BasicPlayerTest test = new BasicPlayerTest();
                test.play(args[0]);
         }

        /**
         * Contructor.
         */
        public BasicPlayerTest()
        {
               out = System.out;
        }        public void play(String filename)
        {
                // Instantiate BasicPlayer.
                BasicPlayer player = new BasicPlayer();
                // BasicPlayer is a BasicController.
                BasicController control = (BasicController) player;
                // Register BasicPlayerTest to BasicPlayerListener events.
                // It means that this object will be notified on BasicPlayer
                // events such as : opened(...), progress(...), stateUpdated(...)
                player.addBasicPlayerListener(this);                try
                {
                        // Open file, or URL or Stream (shoutcast) to play.
                        control.open(new File(filename));
                        // control.open(new URL("http://yourshoutcastserver.com:8000"));

                        // Start playback in a thread.
                        control.play();

                        // Set Volume (0 to 1.0).
                        // setGain should be called after control.play().
                        control.setGain(0.85);

                        // Set Pan (-1.0 to 1.0).
                        // setPan should be called after control.play().
                        control.setPan(0.0);                        // If you want to pause/resume/pause the played file then
                        // write a Swing player and just call control.pause(),
                        // control.resume() or control.stop().
                        // Use control.seek(bytesToSkip) to seek file
                        // (i.e. fast forward and rewind). seek feature will
                        // work only if underlying JavaSound SPI implements
                        // skip(...). True for MP3SPI (JavaZOOM) and SUN SPI's
                        // (WAVE, AU, AIFF).

                 }
                catch (BasicPlayerException e)
                {
                        e.printStackTrace();
                 }
        }

        /**
         * Open callback, stream is ready to play.
         *
         * properties map includes audio format dependant features such as
         * bitrate, duration, frequency, channels, number of frames, vbr flag,
         * id3v2/id3v1 (for MP3 only), comments (for Ogg Vorbis), ... 
         *
         * @param stream could be File, URL or InputStream
         * @param properties audio stream properties.
         */
        public void opened(Object stream, Map properties)
        {
                // Pay attention to properties. It's useful to get duration, 
                // bitrate, channels, even tag such as ID3v2.
                display("opened : "+properties.toString());
         }

        /**
         * Progress callback while playing.
         * 
         * This method is called severals time per seconds while playing.
         * properties map includes audio format features such as
         * instant bitrate, microseconds position, current frame number, ... 
         * 
         * @param bytesread from encoded stream.
         * @param microseconds elapsed (<b>reseted after a seek !</b>).
         * @param pcmdata PCM samples.
         * @param properties audio stream parameters.
         */
        public void progress(int bytesread, long microseconds, byte[] pcmdata, Map properties)
        {
                // Pay attention to properties. It depends on underlying JavaSound SPI
                // MP3SPI provides mp3.equalizer.
                display("progress : "+properties.toString());
         }

        /**
         * Notification callback for basicplayer events such as opened, eom ...
         *  
         * @param event
         */
        public void stateUpdated(BasicPlayerEvent event)
        {
                // Notification of BasicPlayer states (opened, playing, end of media, ...)
                display("stateUpdated : "+event.toString());
                if (event.getCode()==BasicPlayerEvent.STOPPED)
                {
                        System.exit(0);
                }
        }        /**
         * A handle to the BasicPlayer, plugins may control the player through
         * the controller (play, stop, ...)
         * @param controller : a handle to the player
         */
        public void setController(BasicController controller)
        {
                display("setController : "+controller);
        }

        public void display(String msg)
        {
                if (out != null) out.println(msg);
        }}