[Bug 793270] videopool: define GST_BUFFER_POOL_OPTION_VIDEO_DMABUF

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793270

--- Comment #5 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #4)
> Ok, don't forget about kmssink. I bet adding this option will help decision
> making in complex cases.
> 
> I think overall it make sense. Now, the location ... it's a hard one. So far
> DMABuf is only used for Video, but it should not be limited to that ...
> Maybe  GST_BUFFER_POOL_OPTION_DMABUF, in the base class ...
> 
> Further thinking, what always come out for Video (this one is video
> specific) is if there will be 1 FD or multiple FD (planar formats). Is there
> anyway to advertise / differentiate that ? Two options ?

would that be part of the future allocation meta?

Any other opinion? @tim? @slomo?

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