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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #17 from Benjamin Gaignard <benjamin.gaignard at gmail.com> ---
shm, egl or dmabuf are allocation methods so I believe we have to add them as
allocator in wayland pool. In this way it will be up to the upstream element to
select the wanted allocator and not decide this while creating the pipeline by
putting different elements for each allocation method.

Until now wayland dmabuf protocol doesn't propose to allocate the memory so
what we have done is to use libdrm to allocate dumb buffers and get a file
descriptor with prime interface. I think it is fair enough since most (even
all) systems using wayland are drm based.

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