[Bug 794817] msdk: enc: Add Dmabuf Import support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794817

--- Comment #3 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Our experiments and research continues. So far, it would seem that the pool
would be "notified" after being activated, because activating a pool may fail
in cases where a fallback is possible. On our side, we don't have this extreme
requirement, we just need to know how many buffers, so that we can optimize and
make sure buffer mapping is constant. We still tolerate more buffers being
added. V4L2 with UVC driver as an example have this CREATE_BUFS feature, that
can be triggered to increase the buffer pool size if it's needed (instead of
blocking on the pool).

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