[Bug 785011] videodecoder: Default buffer pool supports GstVideoAlignment but downstream might not

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785011

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

           What    |Removed                     |Added
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                 CC|                            |nicolas at ndufresne.ca

--- Comment #34 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
(In reply to Sebastian Dröge (slomo) from comment #32)
> I guess one solution here would be to allow configuring on the
> GstVideoBufferPool if it should support these things during creation, and
> not support it for pools created by default in base classes, etc. Also needs
> careful checking everywhere, where GstVideoBufferPool is currently used to
> cover similar cases.

No, one should just not rely on the pool option to decide about using
GstVideoMeta or not. There is only one valid way to know if downstream support
GstVideoMeta, and this is using gst_query_find_allocation_meta().

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