Urgent: JMF Player for real time voice input

[Big Chong]

Dear all developer,
I have develop an applet(the following code) which acts as media player for real time voice input, i.e: rtp://202.212.122.122:4000/audio
But, the program sometime can run, sometime can't run(which stuck in
the realizing state and can't progress to RealizeCompleteEvent).
Please enlightened me .... Many many thanks.

// Java core packages
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
// Java extension packages
import javax.swing.*;
import javax.media.*;
public class MediaPlayerApplet extends JApplet {
   // Java media player
   private Player player;
   // visual content component
   //private Component visualMedia;
   // controls component for media
   private Component mediaControl;
   // main container
   private Container container;
   // media file and media locations
   private File mediaFile;
   private URL fileURL;
   // constructor for SimplePlayer
   //public MediaPlayerApplet()
   public void init() 
   {
      System.out.println("init()...");
      //super( "Stream Media Player" );
      container = getContentPane();
      
      container.setLayout(new BorderLayout());

      // panel containing buttons
      JPanel buttonPanel = new JPanel();
      container.add( buttonPanel, BorderLayout.CENTER);
      
      // URL opening button
      JButton openURL = new JButton( "Open Locator" );
      buttonPanel.add( openURL );
      // register an ActionListener for openURL events
      openURL.addActionListener(
         // anonymous inner class to handle openURL events
         new ActionListener() {
            // open and create player for media locator
            public void actionPerformed( ActionEvent event )
            {
               String addressName = getMediaLocation();

   //28.10.03
               if ( addressName != null ){
                  makePlayer( addressName );
               }   
            }
         }  // end ActionListener
      ); // end call to method addActionListener

  // turn on lightweight rendering on players to enable
      // better compatibility with lightweight GUI components
      Manager.setHint( Manager.LIGHTWEIGHT_RENDERER,
         Boolean.TRUE );  
     
   }  // end constructor
  // utility method for pop-up error messages
   public void showErrorMessage( String error )
   {
    ...
   }
   
   // get media location from user input
   public String getMediaLocation()
   {
      String input = JOptionPane.showInputDialog(
         this, "Enter URL" );
      // if user presses OK with no input
      if ( input != null && input.length() == 0 )
         return null;
      return input;
   }
   
    // create player using media's location
   public void makePlayer( String mediaLocation )
   {
     System.out.println("Enter makePlayer..");
      
      // reset player and window if previous player exists
      if ( player != null )
         removePlayerComponents();
      // location of media source
      MediaLocator mediaLocator =
         new MediaLocator( mediaLocation );
      if ( mediaLocator == null ) {
         showErrorMessage( "Error opening file" );
         return;
      }
      // create a player from MediaLocator
      try {
       System.out.println("creating Player...");
         player = Manager.createPlayer( mediaLocator );
 System.out.println("created Player...");
         // register ControllerListener to handle Player events
         player.addControllerListener(
            new PlayerEventHandler() );
         // call realize to enable rendering of player's media
         player.realize();
         System.out.println("player realized...");
      }
      // no player exists or format is unsupported
      catch ( NoPlayerException noPlayerException ) {
       noPlayerException.printStackTrace();
       System.out.println();
       System.out.println("Player Error:"+ noPlayerException.toString());
      }
      // file input error
      catch ( IOException ioException ) {
         ioException.printStackTrace();
      }
   }  // end makePlayer method
   // return player to system resources and
   // reset media and controls
   public void removePlayerComponents()
   {
     // remove previous video component if there is one
     /*if ( visualMedia != null )
        container.remove( visualMedia );*/
     // remove previous media control if there is one
     if ( mediaControl != null )
        container.remove( mediaControl );
     // stop player and return allocated resources
     player.close();
   }
   // obtain visual media and player controls
   public void getMediaComponents()
   {
      // get visual component from player
      //visualMedia = player.getVisualComponent();
      // add visual component if present
      /*
        if ( visualMedia != null )
        container.add( visualMedia, BorderLayout.CENTER );
  */
      // get player control GUI
      mediaControl = player.getControlPanelComponent();
      // add controls component if present
      if ( mediaControl != null )
         container.add( mediaControl, BorderLayout.SOUTH );
   }  // end method getMediaComponents
   public void stop() {
   if(player!=null){
       player.stop();
       player.deallocate();
    }   
   }
   public void destroy() {
     if(player!=null){
       player.close();
      } 
    }

   // Inner Class: Handler for player's ControllerEvents
   private class PlayerEventHandler extends ControllerAdapter {
      // prefetch media feed once player is realized
      public void realizeComplete(
         RealizeCompleteEvent realizeDoneEvent )
      {
       System.out.println("In realizeComplete method:>>");
       System.out.println("Event: realizeComplete occured");
         player.prefetch();
         System.out.println("Player prefetching...");
         System.out.println("Exit realizeComplete method:>>");
      }
      // player can start showing media after prefetching
      public void prefetchComplete(
         PrefetchCompleteEvent prefetchDoneEvent )
      {
         System.out.println("In prefetchComplete method:>>");
         System.out.println("Event: prefetchComplete occured");
         getMediaComponents();
         // ensure valid layout of frame
         validate();
         // start playing media
         player.start();
         System.out.println("Player start.");
         System.out.println("Player shown media...");
         System.out.println("Exit prefetchComplete method:>>");
      }  // end prefetchComplete method
      // if end of media, reset to beginning, stop play
      public void endOfMedia( EndOfMediaEvent mediaEndEvent )
      {
       System.out.println("In endOfMedia method:");
       System.out.println("Event: EndOfMediaEvent occured");
         player.setMediaTime( new Time( 0 ) );
         player.stop();
         System.out.println("Player stop.");
         System.out.println("Out endOfMedia method:");
      }
   }  // end PlayerEventHandler inner class
}  // end class MediaPlayerApplet

Regards,
Chong
--JAM Edited to include [CODE] and [/CODE] tags;
[ November 10, 2003: Message edited by: Joel McNary ]

[Ernest Friedman-Hill]

Moving to "Other Java APIs."