[Bug 755072] vaapi: expose memory:DMABuf capsfeature

[GStreamer (GNOME Bugzilla)]

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

--- Comment #39 from Julien Isorce <julien.isorce at gmail.com> ---
Thx Victor it makes sense to me and sorry if you got some regressions, I had
not tested this patch with v4l2sc, only the downstream case.
I think the fact that you identified that it requires a deign change to handle
downstream case is great. Previously I was only trying to kind of workaround
it.

In your detailed downstream sequence (1, 2, 3, 4) for me it means that you will
export every-time a buffer is pushed (instead of exporting once for all at pool
configuration), so the same surface will be exported with a different fd and
downstream element will not be able to do caching. What I am missing ?

Is 4) to call vaReleaseBufferHandler at the proper time ?

Thx!

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