[MeeGo-touch-dev] gstreamer is not rendering video in MApplicationWindow.

[Armin Berres]

On 01/03/2011 05:39 PM, john pratss wrote:
> Hi,
> 
> 
> Gstreamer is not rendering videos in an MApplicationWindow. I have passed the
> window ID of the MApplicationWindow. I have given the code which I am trying
> as below.
> Any pointers on this.

I did not look at the gstreamer code but try to replace
"WId xwinid = mAppWnd->winId();"
with
"WId xwinid = mAppWnd->viewport->effectiveWinId();"
This makes sure you use the winId of the viewport if a special one has
been set (like a QGLWidget) or the next toplevel window if no native
window has been set as viewport.

Cheers,
Armin


> 
> Cheers,
> John
> 
> #include <gst/gst.h>
> #include <gst/interfaces/xoverlay.h>
> #include <QDebug>
> #include <QApplication>
> #include <QTimer>
> #include <QWidget>
> #include <MApplicationWindow>
> #include <MApplication>
> 
> #define DEFAULT_VIDEOSINK "xvimagesink"
> /* slightly convoluted way to find a working video sink that's not a bin,
>  * one could use autovideosink from gst-plugins-good instead
>  */
> static GstElement *
> find_video_sink (void)
> {
>   GstStateChangeReturn sret;
>   GstElement *sink;
> 
>   if ((sink = gst_element_factory_make ("xvimagesink", NULL))) {
>     sret = gst_element_set_state (sink, GST_STATE_READY);
>     if (sret == GST_STATE_CHANGE_SUCCESS)
>       return sink;
> 
>     gst_element_set_state (sink, GST_STATE_NULL);
>   }
>   gst_object_unref (sink);
> 
>   if ((sink = gst_element_factory_make ("ximagesink", NULL))) {
>     sret = gst_element_set_state (sink, GST_STATE_READY);
>     if (sret == GST_STATE_CHANGE_SUCCESS)
>       return sink;
> 
>     gst_element_set_state (sink, GST_STATE_NULL);
>   }
>   gst_object_unref (sink);
> 
>   if (strcmp (DEFAULT_VIDEOSINK, "xvimagesink") == 0 ||
>       strcmp (DEFAULT_VIDEOSINK, "ximagesink") == 0)
>     return NULL;
> 
>   if ((sink = gst_element_factory_make (DEFAULT_VIDEOSINK, NULL))) {
>     if (GST_IS_BIN (sink)) {
>       gst_object_unref (sink);
>       return NULL;
>     }
> 
>     sret = gst_element_set_state (sink, GST_STATE_READY);
>     if (sret == GST_STATE_CHANGE_SUCCESS)
>       return sink;
> 
>     gst_element_set_state (sink, GST_STATE_NULL);
>   }
>   gst_object_unref (sink);
>   return NULL;
> }
> 
> int main(int argc, char *argv[])
> {
>   if (!g_thread_supported ())
>     g_thread_init (NULL);
> 
>   gst_init (&argc, &argv);
>   MApplication app(argc, argv);
>   app.setOrganizationName("sample");
> 
>   MApplicationWindow *mAppWnd = new MApplicationWindow();
> 
>   app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit ()));
> 
>   /* prepare the pipeline */
> 
>   GstElement *pipeline = gst_pipeline_new ("xvoverlay");
>   GstElement *src = gst_element_factory_make ("videotestsrc", NULL);
>   GstElement *sink = find_video_sink ();
> 
>   if (sink == NULL)
>     g_error ("Couldn't find a working video sink.");
> 
>   gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL);
>   gst_element_link (src, sink);
> 
>   /* prepare the ui */
> 
>   /*QWidget window;
>   window.resize(320, 240);
>   window.setWindowTitle("GstXOverlay Qt demo");
>   window.show();
>   WId xwinid = window.winId();*/
>   WId xwinid = mAppWnd->winId();
>   mAppWnd->show();
> 
>   gst_x_overlay_set_xwindow_id (GST_X_OVERLAY (sink), xwinid);
> 
>   /* run the pipeline */
> 
>   GstStateChangeReturn sret = gst_element_set_state (pipeline,
>       GST_STATE_PLAYING);
>   if (sret == GST_STATE_CHANGE_FAILURE) {
>     gst_element_set_state (pipeline, GST_STATE_NULL);
>     gst_object_unref (pipeline);
>     /* Exit application */
>     //QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit()));
>   }
>   int ret = app.exec();
> 
>   //window.hide();
>   gst_element_set_state (pipeline, GST_STATE_NULL);
>   gst_object_unref (pipeline);
> 
>   return ret;
> }
> 
> 
> 
> 
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-- 
Armin Berres

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