[Bug 789476] vaapi plugins: append allocator in allocation query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789476

Víctor Manuel Jáquez Leal <vjaquez at igalia.com> changed:

           What    |Removed                     |Added
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 Attachment #367975|0                           |1
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--- Comment #21 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 368131
  --> https://bugzilla.gnome.org/attachment.cgi?id=368131&action=edit
plugins: handle vaapi allocator in allocation query

In propose_allocation() if the numer of allocation params is zero, the
system's allocator is added first, and lastly the native VA-API
allocator.

In decide_allocation(), the allocations params in query are travered,
looking for a native VA-API allocator. If it is found, it is reused as
src pad allocator. Otherwise, a new allocator is instantiated and
appended in the query.

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