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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #45 from Julien Isorce <julien.isorce at gmail.com> ---
+1 to add memory:dmabuf caps feature in gst-plugins-base.

Benjamin I am trying to find a consensus so in your use case you have a flow
with both dmabuf and system mem right ?

What we probably need in your case it dmabuf type for
gst_query_add_allocation_meta or a dmabuf option for
gst_buffer_pool_config_add_option.
So that your sink does not need to expose a dmabuf caps feature in its caps,
but just add this meta or option when proposing a pool.
At runtime you will always have gst_is_dmabuf_memory to check what type of
buffer you got.
In the end the caps of the flow will be just video/x-raw without restricting
the memory type.

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