[Bug 793271] v4l2object: Check for all allocators and pools in query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793271

--- Comment #3 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #2)
> Ok, I see why you wanted this in 793270 now. There was an open question if
> it was ever correct to add a DMABuf allocator (for the case there is no
> alloc/custom) in the allocation query. I think if the answer is no, then
> until we have a non-custom dmabuf allocator, this is a bit speculative.

Agree, a dmabuf allocator with a custom alloc, as the gstreamer-vaapi case,
might no be right to share it. I can remove it from the query in
gstreamer-vaapi :)

> For the pool option, well, an option is supposed to be explicitly enabled by
> the user. So the usage is a bit of a clash if enabling it have no effect
> (it's already enabled).

If enabled and downstream doesn't provide a dmabuf-enable pool or allocator, it
fails.

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