[Bug 730758] tee: Handle ALLOCATION query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=730758

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
I was thinking about this yesterday, I think it would be best to force upstream
allocation in case of tee. As the allocation cannot be replaced reliably,
letting downstream pools being used will make it difficult, near impossible for
dynamic pipelines.

So in the end, what we need to aggregate is the min/max/size, for the
allocation pools, but ignore the pools, the memory alignment for the param and
ignore the allocators (? not certain) and then intersect the metas.

Could have been nice to have some semantic for let's say OverlayComposition.
The intersection will likely drop it if the displays report different size.
While in practice it should have picked the biggest size in order to guaranty
the highest sub-title / overlay quality.

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