[Bug 711155] wayland: add wl_drm support to wayland sink

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=711155

--- Comment #26 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
I think in the end, it's fair to say waylandeglsink is a project for possible
future micro optimization, I didn't mean to mention that in the sense that we
MUST add support for that. Instead I wanted this proposed design to be complete
complete. Currently glimagesink and friends will most often do the job.

I think what I care the most is having the ability to say "I want DMABUF, or
nothing". And because you cannot fully negotiate dmabuf, having both SHM and
DMABUF together may fail in the opposite use case because the color format of
your dmabuf is not one of the supported shm for at.

To make it clear, if you have a DMABUF with a color format that is known for
the list of DRM valid formats, you have no choice but to assume it will work.
But if it's fails, the way to fallback with a single sink would require
duplicating videoconvert inside the single element. A wrapper bin can do that
with less code, resuing videoconvert and enabling the "DMABUF of fail" use
case.

As it's clear that uploading on client side should happen on client side, again
with a single sink we'd have to duplicate what glupload and glvideoconvert do.

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