[vlc-devel] libvlc_media_player_stop
David Hoyt
dhoyt at llnl.gov
Mon Oct 27 21:10:38 CET 2008
Using JVLC and SWT, do:
1. Make sure you have a working SWT environment (use eclipse or get the SWT
jars - http://www.eclipse.org/swt/)
2. Create a class named "Utilities" in the org.videolan.jvlc package. Put
this in:
package org.videolan.jvlc;
import org.videolan.jvlc.internal.LibVlc.LibVlcInstance;
public class Utilities {
public static LibVlcInstance getNativeInstance(JVLC vlc) {
return vlc.getInstance();
}
}
3. Create a class named "Main" in the default package. Put this in:
import java.io.File;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;
import org.videolan.jvlc.JVLC;
import org.videolan.jvlc.MediaPlayer;
import org.videolan.jvlc.Utilities;
import org.videolan.jvlc.internal.LibVlc;
class Main {
public static void runMessageLoop(Shell shell) {
if (shell == null) {
throw new IllegalStateException("Please define the shell before
continuing");
}
Display display = shell.getDisplay();
if (display != null && !display.isDisposed()) {
while (!display.isDisposed() && !shell.isDisposed()) {
if (!display.isDisposed() && !display.readAndDispatch()) {
display.sleep();
}
}
}
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
//<editor-fold defaultstate="collapsed" desc="GUI objects">
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
shell.setLayout(new FillLayout());
final Button btnSwitch = new Button(shell, SWT.PUSH);
btnSwitch.setText("Switch");
btnSwitch.setSize(100, 40);
//</editor-fold>
final Canvas[] canvases = new Canvas[24];
final JVLC[] vlcs = new JVLC[canvases.length];
final MediaPlayer[] mps = new MediaPlayer[canvases.length];
for (int i = 0; i < canvases.length; ++i) {
canvases[i] = new Canvas(shell, SWT.NONE);
vlcs[i] = new JVLC(new String[]{
"--plugin-path=" + new File(".").getAbsolutePath() + "\\" +
"plugins"
});
}
btnSwitch.addSelectionListener(new SelectionAdapter() {
FileDialog fd = null;
@Override
public void widgetSelected(SelectionEvent e) {
if (fd == null) {
fd = new FileDialog(shell, SWT.OPEN);
fd.setText("Select Media File");
fd.setFilterExtensions(new String[]{
"*.mjpg",
"*.avi",
"*.mpeg;*.mpg",
"*.mpeg2;*.mpg2",
"*.mpeg4;*.mp4",
"*.png",
"*.jpg;*.jpeg",
"*.*"
});
fd.setFilterNames(new String[]{
"Motion JPEG Files (*.mjpg)",
"AVI Files (*.avi)",
"MPEG Files (*.mpeg, *.mpg)",
"MPEG2 Files (*.mpeg2, *.mpg2)",
"MPEG4 Files (*.mpeg4, *.mp4)",
"PNG Files (*.png)",
"JPEG Files (*.jpg, *.jpeg)",
"All Files (*.*)"
});
fd.setFilterIndex(0);
}
String file = "";
if ((file = fd.open()) != null && !"".equals(file)) {
final File f = new File(file);
if (!f.exists()) {
return;
}
for (int i = 0; i < canvases.length; ++i) {
if (mps[i] != null) {
mps[i].stop();
}
if (mps[i] == null) {
LibVlc.INSTANCE.libvlc_video_set_parent(Utilities.getNativeInstance(vlcs[i])
, canvases[i].handle, new LibVlc.libvlc_exception_t());
}
mps[i] = vlcs[i].play(f.getAbsolutePath());
}
}
}
});
shell.open();
shell.setVisible(true);
runMessageLoop(shell);
}
}
4. Run the class.
5. Click on the "Switch" button and open up a video (I was testing w/ MPEG
and WMV videos).
6. Repeat step 5.
You'll see the videos freeze after about 4-5 panels. I can reproduce this
behavior pretty much every time I run it. If you're able to pause your
debugger, you'll see that it's stuck in the call to
libvlc_media_player_stop(). I haven't tested it out in Linux (Ubuntu) and so
I'm not sure if it will show the same behavior. But in Windows XP at least,
the app freezes up.
-----Original Message-----
From: vlc-devel-bounces at videolan.org [mailto:vlc-devel-bounces at videolan.org]
On Behalf Of Pierre d'Herbemont
Sent: Saturday, October 25, 2008 3:49 AM
To: Mailing list for VLC media player developers
Subject: Re: [vlc-devel] libvlc_media_player_stop
On Oct 25, 2008, at 1:43 AM, David Hoyt wrote:
> I've got an interesting error that I've tried everything I know how to
> resolve it. Ultimately, it comes down to the fact that I'm just not
> that familiar w/ the VLC internals.
>
> I'm trying to use vlc in java through the java bindings (JVLC). The
> app freezes on me, however, in libvlc_media_player_stop and sometimes
> in libvlc_media_player_release on Windows XP SP2.
>
> I can't release any example code without going through an exhaustive
> review and release process. So I'm stuck explaining the problem.
>
> Here are some others with the same problem:
> http:// forum.videolan.org/viewtopic.php?f=2&t=51509
> http://
> forum.videolan.org/viewtopic.php?f=14&t=47385&st=0&sk=t&sd=a&start=60
>
> I've got 12+ videos going on a single dialog using SWT. I start them
> out all playing the same video. They then reach the end of the 3-
> second long clip and all stop. I then tell one panel to play a video.
> It plays just fine. Then I tell it to switch and play another video
> while it's still playing (my code asks it to stop first and then play)
> and it freezes. Java tells me it's stuck on the call to
> libvlc_media_player_stop(). This freezes up my app.
>
> I've tried running all the commands on the GUI thread and then also on
> separate threads and no luck. My guess is that it's stuck on line
> 689 of https://
> trac.videolan.org/vlc/browser/src/control/media_player.c
> I've also run into another error if you try and call
> libvlc_media_player_stop() from the endReached event handler. It
> freezes there as well. That's not a tough one to get around, but it
> shouldn't lock up on you.
Could you provide a backtrace, or a sample code that shows the issue?
Pierre.
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