[Bug 765435] plugins: rework dmabuf import

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765435

--- Comment #9 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
(In reply to Víctor Manuel Jáquez Leal from comment #8)
> (In reply to Nicolas Dufresne (stormer) from comment #7)
> > If be pleased to help unhack that code path. Since buffer pool have an
> > activated function, there is no need to do anything before that moment. So
> > vaapi element could offer multiple pool. That is one step.
> 
> Are there elements in upstream already offering multiple pools?
> 
> My current approach is offering one pools but juggling with the allocators.

Offering an allocator requires that you can use it to allocate (see allocate
virtual). So far we have tried to avoid having to break things by inforcing a
check on the CUSTOM_ALLOC flag before using an allocator, as this would break
many existing elements. At the same time, most, if not all uses the first
allocator.

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