[Bug 794216] allocators: Add DMABuf synchronization

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794216

--- Comment #1 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 369530
  --> https://bugzilla.gnome.org/attachment.cgi?id=369530&action=edit
allocators: Add DMABuf synchronization

When doing CPU Access, some architecture may require caches to be
synchronize before use. Otherwise, some visual artifact may be
visible, as the CPU modification may still resides in cache.

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