[Bug 755072] vaapi: expose memory:DMABuf capsfeature

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755072

--- Comment #80 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Julien Isorce from comment #79)
> Fantastic! Thx. Just a question, if plugin->srcpad_can_dmabuf but map fails
> then does the plugin try to negotiate with the dmabuf caps feature ? (this
> is what was doing my wip branch). It looks to me that in the commits you
> pushed the caps feature is only added if someone forced it somewhere (for
> example in a caps filter).

Right now if the buffer map fails, then the chosen allocator is vaapi one,
which is well tested, and there is no need to renegotiate caps. I think that is
more sensible than the (for me, obscure) caps renegotiation. But I'm open to
further changes.

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