[Bug 795707] msdk: enc: Add Dmabuf Export support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795707

sreerenj <bsreerenj at gmail.com> changed:

           What    |Removed                     |Added
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 Attachment #371588|0                           |1
        is obsolete|                            |

--- Comment #2 from sreerenj <bsreerenj at gmail.com> ---
Created attachment 371631
  --> https://bugzilla.gnome.org/attachment.cgi?id=371631&action=edit
msdk: enc: enable dmabuf-export

The first patch had a code block to create a new pool for copying the incoming
buffers if a) dmabuf-capsfeature negotiated and b) upstream rejected the msdk
proposed pool. This won't work since the dmabuf backed msdk buffers are not
mappable. One possible solution could be to keep the internal pool based on
video memory (not-dmabuf) and propose a dmabuf-backed pool in
propose_allocation.  For now, it just errors out if the above scenario occurs.

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