[Bug 793707] msdk: Add dmabuf support in msdk plugins

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793707

sreerenj <bsreerenj at gmail.com> changed:

           What    |Removed                     |Added
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 Attachment #370134|none                        |reviewed
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--- Comment #13 from sreerenj <bsreerenj at gmail.com> ---
Review of attachment 370134:
 --> (https://bugzilla.gnome.org/review?bug=793707&attachment=370134)

I think you need to make sure that the gst_msdk_frame_lock() never tries to
map(vaDeriveImage) if dmabuf is in use since the alloc() already derived the
image for AcquireBufferHandle operation.
As long as we negotiate the "DMABuf" capsfeatures, gstreamer is not supposed to
map, but in case if msdk tries to do the same it will cause issues.

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