[Bug 755072] vaapi: expose memory:DMABuf capsfeature

[GStreamer (GNOME Bugzilla)]

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

--- Comment #11 from Julien Isorce <julien.isorce at gmail.com> ---
https://bugzilla.gnome.org/show_bug.cgi?id=759358(In reply to Víctor Manuel
Jáquez Leal from comment #10)
> mmmhh.. it seems that gstreamer "went forward without the memory:DMABuf
> feature" 
>
> We need to figure out how to handle the dmabuf negotiation without the
> feature.

Yes because we need further investigation. For now it is assumed to be mappable
It is also assumed that the importer will succeed (no sure if it falls back to
software).
So basically in the logic I drafted here
https://bugzilla.gnome.org/show_bug.cgi?id=759358#c7 it does not go further
than first par of 1). But it is still a big step forward :)

So for now, gstreamer-vaapi could do 1) without the feature part.

(Any in any case it cannot be done by checking the allocation query, see
comments "Only offer our custom allocator if that type of memory was
negotiated." in GstGL)

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