[Bug 745372] vpxdec: Should try to avoid copies at output

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745372

--- Comment #11 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Created attachment 316563
  --> https://bugzilla.gnome.org/attachment.cgi?id=316563&action=edit
WIP: vp9dec: Use GstMemory to avoid copies

With the VPX decoders it's not simple to use downstream buffer pool,
because we don't know the image size and alignment when buffers get
allocated. We can though use GstAllocator (for downstream, or the system
allocator) to avoid a copy before pushing if downstream supports
GstVideoMeta. This would still cause a copy for sink that requires
specialized memory, though greatly improve performance for sink that
down like glimagesink and cluttersink.

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