[Bug 746529] videoaggregator: Adding support for downstream allocation negotiation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746529

--- Comment #3 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to Olivier Crête from comment #2)
> I'm not sure why you'd ever want to not use a downstream buffer pool. I'd
> also like to put the decide_allocation (and caps negotiation) infrastructure
> into GstAggregator directly, as the same things are also useful for audio.

About the first comment, this would happen if you use a 2D blitter for the
mixing and want to export DMABUF. E.g. downstream pool is sysmem/GLTexture, but
you can export DMABUF so that GL side do linux-dmabuf-import.

About the second, I think something like GstBaseTransform, which handle the
allocator part iirc, while the buffer pool is video/audio specific (is there
buffer pool for audio ?)

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