[Bug 705821] vaapi/wayland: add support for external wl_surface/wl_display

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=705821

--- Comment #76 from Matteo Valdina <matteo.valdina at gmail.com> ---
Hi,
About my initial issue, I figured out. It was an issue on my side. 

The only persistent issue is when I set a different size from the src. 
I set my desired dimension via gst_video_overlay_set_render_rectangle.

This show for a fraction of a second the desired input but after that the
surface become black.

There is a TODO in the "gst_vaapi_window_wayland_set_render_rect".

void
gst_vaapi_window_wayland_set_render_rect (GstVaapiWindow * window, gint x,
    gint y, gint width, gint height)
{
  GstVaapiWindowWaylandPrivate *const priv =
      GST_VAAPI_WINDOW_WAYLAND_GET_PRIVATE (window);

  if (priv->video_subsurface)
    wl_subsurface_set_position (priv->video_subsurface, x, y);

  /* TODO: something to scale maybe */

  return;
}

My first thought is to add the wl_viewport to do the rescale. But I'm wondering
if it should be implemented with a vaapostproc instead.

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