Don't link avmediagst with gtk3 and qt5

While the VCL plugins are dynamically loaded and therefore just
load their depending toolkit libraries, the GStreamer avmedia
backend now links against Qt and GTK+. The GStreamer API itself
is toolkit agnostic and the toolkit setup just uses a single
GStreamer symbol to create the specific video sink.

So the toolkit binding can simply be moved into the VCL plugin.
At the point of the GStreamer toolkit setup call the GStreamer
library is loaded by avmediagst, so the dlsym lookup should
never fail.

I also dropped the special GtkWidget handling. Using g_object_get
will increase the refcount of the widget. A g_object_unref after
adding it to the container seems to destroy it correctly.

Change-Id: I693947e441bceb4b09bc38920e308e39142d0a35
Reviewed-on: https://gerrit.libreoffice.org/73849
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/vcl/inc/salinst.hxx b/vcl/inc/salinst.hxx
index db1ae606a593..51b0347f3247 100644
--- a/vcl/inc/salinst.hxx
+++ b/vcl/inc/salinst.hxx
@@ -50,6 +50,7 @@ namespace weld {
     class Widget;
     class Window;
 }
+class SystemChildWindow;
 struct SystemParentData;
 struct SalPrinterQueueInfo;
 class ImplJobSetup;
@@ -206,6 +207,8 @@ public:
     virtual OUString        getOSVersion() { return OUString("-"); }
 
     virtual const cairo_font_options_t* GetCairoFontOptions() { return nullptr; }
+
+    virtual void* CreateGStreamerSink(const SystemChildWindow*) { return nullptr; }
 };
 
 // called from SVMain