[Bug 794946] msdk: vpp: Add dmabuf-export support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794946

Víctor Manuel Jáquez Leal <vjaquez at igalia.com> changed:

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--- Comment #3 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Review of attachment 371145:
 --> (https://bugzilla.gnome.org/review?bug=794946&attachment=371145)

Hi Sree,

The problem with this patch is that it is only enabled with the dmabuf caps
feature, and that caps feature shall be only enabled by upstream if it
generates dmabuf-based buffers which cannot be mapped onto the userspace.

For example a sink can efficiently import a dmabuf without negotiating the caps
feature because it wouldn't support non-user-space-mappable buffers. A simple
approach would be export dmabuf-based buffers if downstream negotiates raw
buffers or dmabuf caps feature.

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