/// <summary>
///
/// </summary>
/// <remarks>
/// Indeed the application needs to set its Window identifier at the right time to avoid internal Window creation
/// from the video sink element. To solve this issue a GstMessage is posted on the bus to inform the application
/// that it should set the Window identifier immediately.
///
/// API: http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideooverlay.html
/// </remarks>
/// <param name="o"></param>
/// <param name="args"></param>
private void bus_SyncMessage(object o, SyncMessageArgs args)
{
//Convenience function to check if the given message is a "prepare-window-handle" message from a GstVideoOverlay.
System.Diagnostics.Debug.WriteLine("bus_SyncMessage: " + args.Message.Type.ToString());
if (Gst.Video.Global.IsVideoOverlayPrepareWindowHandleMessage(args.Message))
{
Element src = (Gst.Element)args.Message.Src;
#if DEBUG
System.Diagnostics.Debug.WriteLine("Message'prepare-window-handle' received by: " + src.Name + " " + src.ToString());
#endif
if (src != null && (src is Gst.Video.VideoSink | src is Gst.Bin))
{
// Try to set Aspect Ratio
try
{
src["force-aspect-ratio"] = true;
}
catch (PropertyNotFoundException) { }
// Try to set Overlay
try
{
Gst.Video.VideoOverlayAdapter overlay_ = new Gst.Video.VideoOverlayAdapter(src.Handle);
overlay_.WindowHandle = (IntPtr)mHandle;
overlay_.HandleEvents(true);
}
catch (Exception ex) { System.Diagnostics.Debug.WriteLine("Exception thrown: " + ex.Message); }
}
}
}
/// <summary>
/// Set the panel on which to display the video. This must be done at the right time and via this callback.
/// </summary>
/// <param name="o"></param>
/// <param name="args"></param>
private void cb_busSyncMessage(object o, SyncMessageArgs args)
{
if (Gst.Video.Global.IsVideoOverlayPrepareWindowHandleMessage(args.Message))
{
Element src = (Gst.Element)args.Message.Src;
sysDbg.WriteLine("Message'prepare-window-handle' received by: " + src.Name + " " + src.ToString());
{
// Try to set Overlay
try
{
Gst.Video.VideoOverlayAdapter overlay_ = new Gst.Video.VideoOverlayAdapter(src.Handle);
overlay_.WindowHandle = (IntPtr)HdlPreviewPanel;
overlay_.HandleEvents(true);
}
catch (Exception ex)
{
sysDbg.WriteLine("Error setting overlay: " + ex.Message);
}
}
}
if (args.Message.Type == MessageType.Eos)
{
sysDbg.WriteLine("EOS sync message received...");
}
}
private void bus_SyncMessage(object o, SyncMessageArgs args)
{
if (Gst.Video.Global.IsVideoOverlayPrepareWindowHandleMessage(args.Message))
{
Element src = (Gst.Element)args.Message.Src;
if (src != null && (src is Gst.Video.VideoSink | src is Gst.Bin))
{
// Try to set Aspect Ratio
try
{
src["force-aspect-ratio"] = true;
}
catch (PropertyNotFoundException) { }
// Try to set Overlay
try
{
Gst.Video.VideoOverlayAdapter overlay = new Gst.Video.VideoOverlayAdapter(src.Handle);
overlay.WindowHandle = mHandle;
overlay.HandleEvents(true);
}
catch (Exception ex) { }
}
}
}
