[Bug 793270] videopool: define GST_BUFFER_POOL_OPTION_VIDEO_DMABUF

[GStreamer (GNOME Bugzilla)]

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

--- Comment #6 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
(In reply to Víctor Manuel Jáquez Leal from comment #5)
> (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?

I don't really have a plan anymore. There is also the GstVideoMeta API params
for ome of this that could be used. But then for my use cases, I'll need params
merging for tee to still work in zero-copy.

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