Audio player with some extra's - can't get player realized

Question

I try to build an audio player with some extra's like looping between 2 time marks.
Till now i have an interface that can play back audio files but after that the problems start.
There is no way i can add functions without creating a {color:#ff0000}NotRealizedError{color}.
According to the documentation the start() method should realize (etc) the player, but it doesn't in my program and neighter does the method player.realize();.
Can someone give me a hint to get me on the road again.
Thanks in advance.
Here is the complete code which generates the NotRealizedError on the dp.setRate(); method:
(most of it is older source from a basic player on the internet).
package dictaplayer;
import java.awt.*;*
*import java.awt.event.*;
import java.io.*;*
*import java.net.MalformedURLException;*
*import java.net.URI;*
*import java.net.URL;*
*import javax.swing.*;
import javax.media.*;
public class DictaPlayer extends JFrame {
private Player dp;
private URI uri;
private URL url;
private boolean realized = false;
public DictaPlayer()
super( "Testing DictaPlayer" );
JButton openFile = new JButton( "Open file to play" );
openFile.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent e ) {
openFile();
createPlayer();
getContentPane().add( openFile, BorderLayout.NORTH );
setSize( 300, 300 );
setVisible(true);
private void openFile()
File file = null;
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(
JFileChooser.FILES_ONLY );
int result = fileChooser.showOpenDialog( this );
// user clicked Cancel button on dialog
if ( result != JFileChooser.CANCEL_OPTION )
file = fileChooser.getSelectedFile();
try {
uri = file.toURI();
} catch (SecurityException e) {
e.printStackTrace();
// Convert the absolute URI to a URL object
try {
url = uri.toURL();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
private void createPlayer()
if ( url == null )
return;
removePreviousPlayer();
try {
// create a new player and add listener
dp = Manager.createPlayer( url );
// blockingRealize();
dp.addControllerListener( new EventHandler() );
dp.start(); // start player
dp.setRate(2);
catch ( Exception e ){
JOptionPane.showMessageDialog( this,
"Invalid file or location", "Error loading file",
JOptionPane.ERROR_MESSAGE );
private void removePreviousPlayer()
if ( dp == null )
return;
dp.close();
Component visual = dp.getVisualComponent();
Component control = dp.getControlPanelComponent();
Container c = getContentPane();
if ( visual != null )
c.remove( visual );
if ( control != null )
c.remove( control );
private synchronized void blockingRealize() {
int teller = 1;
dp.realize();
while (!realized && teller <= 20) {
try {
wait(1000);
System.out.println("not realized " +teller);+
+teller++;
} catch (java.lang.InterruptedException e) {
System.exit(1);
public static void main(String args[])
DictaPlayer app = new DictaPlayer();
app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
System.exit(0);
// inner class to handler events from media player
private class EventHandler implements ControllerListener {
public void controllerUpdate( ControllerEvent e ) {
if ( e instanceof RealizeCompleteEvent ) {
Container c = getContentPane();
// load Visual and Control components if they exist
Component visualComponent =
dp.getVisualComponent();
if ( visualComponent != null )
c.add( visualComponent, BorderLayout.CENTER );
Component controlsComponent =
dp.getControlPanelComponent();
if (!realized) {
System.out.println("not realized.");
if ( controlsComponent != null )
c.add( controlsComponent, BorderLayout.SOUTH );
c.doLayout();
}

Answer 1

captfoss,
Thank you for your comment.
captfoss wrote:
Start does realize the player, automatically, before it starts it... if it isn't realizing then it also isn't starting.Right, I thought so, but my test was wrong. I now tested it with getState() and I can see it's going from unrealized to realized.
First off, you can only call setRate on a player that is realized but not started... further, any of the calls like configure, realize, start, stop, etc... are non-blocking calls...so you have to wait for them to finish before you go on to the next step.So you say that when the rate is changed (f.i. by a user in a gui) the program first has to bring player in non-started realized mode (stop + realize), call the setRate() and start the player again (on the exact position it was stopped)?
The easiest solution would be to use Manager.createRealizedPlayer rather than Manager.createPlayer...Didn't find out yet why, but when i change this (only this), there is no playing.
Also, ++teller++ is about the most-confused looking code I've ever seen...Just like all the asterisks, i now know that code changes when i toggle between the tabs (rich/plain/preview) in the message box.
Beyond that, your "blocking realize" function doesn't appear to do anything except suggest you have no business coding anything this advanced. Your boolean value "realize" isn't ever changed, so, I'm not entirely sure what the point of that function is other than to wait 10 seconds.I got this somewhere from the internet. Thought it could help me realize the player, but it didn't (obvious) so i commented it out.
Slowly I begin to understand the basics of JMF (at least i think so), but I also understand that there are other (Java) ways to build the application I need. Unfortunatly I have to little (hardly any) knowledge of all those (sound) API's (f.i. JLayer) to find my way through them and to decide which is the best for my use (user controled audio playback (at least WAV and MP3) with looping possiblities between 2 marked positions).
If someone could give me an advise which API (method or whatever you call it) is best to focus on I shurely would appriciate that.