Overlay Video on Wayland

[Nicolas Dufresne]

Le mercredi 18 avril 2018 à 23:13 -0400, Scott Talbert a écrit :
> On Tue, 17 Apr 2018, Nicolas Dufresne wrote:
> 
> > > > > Is it possible to use video overlays (either with GstPlayer
> > > > > or playbin) on
> > > > > Wayland surfaces?  And if so, what is the recommended
> > > > > approach?  I saw
> > > > > there was 'waylandsink' but it doesn't seem to be public.
> > > > 
> > > > waylansink is part of gst-plugins-bad (unstable), and can be
> > > > used with
> > > > GstVideoOverlay interface on wayland. Run "gst-inspect-1.0
> > > > waylandsink"
> > > > for details. An example application can be found here:
> > > > 
> > > > https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/tes
> > > > ts/examples/waylandsink
> > > 
> > > The problem, though, is that gst/wayland/wayland.h header is not
> > > public.
> > > 
> > > See
> > > https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/gst-l
> > > ibs/gst/wayland/Makefile.am#n26
> > 
> > You don't really need that library. The geometry stuff can be
> > ignored,
> > and then the rest is just helpers around string comparison:
> > 
> > https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/gst-lib
> > s/gst/wayland/wayland.c
> > 
> > If you really want these helpers, you can copy them in your app.
> 
> OK.  I'm seeing a few issues with the sample application.
> 
> First, these warnings are issued during startup (on Fedora 27):
> 
> ** (gst-wayland-gtk-demo:11908): WARNING **: Wayland compositor is
> missing 
> the ability to scale, video display may not work properly.

Yes, I've added that warning to try and convince people that a GL
compositer should support scaling. waylandsink without that in the
compositor is pretty useless, and that's why waylandsink is pretty
useless on Gnome Shell.

> 
> ** (gst-wayland-gtk-demo:11908): WARNING **: Could not bind to 
> zwp_linux_dmabuf_v1
> 
> On Debian Unstable, I see the first warning only.

I have go the example builds, do you also get that warning in:

  gst-launch-1.0 videotestsrc ! waylandsink

I have Fedora 27, and on Gnome Shell I don't get this warning (maybe
I'll get this problem tomorrow when I update ...).

> 
> Second, the window seems to be drawn in the wrong location.  The
> window 
> with the blue background and bouncing ball is shifted down and to
> the 
> right about 100 pixels of where it should be.  This doesn't seem to
> be a 
> problem with the coordinates passed to 
> gst_video_overlay_set_render_rectangle().  If I mess with those 
> coordinates, I can see that the black window changes position, but
> the 
> blue window does not.
> 
> Thirdly, if I use the GTK+ close button to close the window, gnome-
> shell 
> crashes.  While this is probably a gnome-shell bug, it is very
> annoying. 
> :)
> 
> Scott
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