[Bug 775698] vaapisink: wayland: mutter cannot import surface into a texture

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775698

--- Comment #20 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 368273
  --> https://bugzilla.gnome.org/attachment.cgi?id=368273&action=edit
vaapi: register vaapisink as marginal on wayland

vaapsink, when used with the Intel VA-API driver, tries to display
surfaces with format NV12, which are handled correctly by
Weston. Nonetheless, COGL cannot display YUV surfaces, making fail
pipelines on mutter.

This shall be solved either by COGL or by making the driver to paint
RGB surfaces. In the meanwhile, let's just demote vaapisink as
marginal when the Wayland environment is detected, no matter if it is
Weston.

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