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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #15 from Hyunjun Ko <zzoon at igalia.com> ---
(In reply to sreerenj from comment #13)
> Review of attachment 370134 [details] [review]:
> 
> 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.

Good point. Agreed.

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