[Bug 787093] omx: add dynamic buffer mode from OMX 1.2.0

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787093

--- Comment #9 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 361877
  --> https://bugzilla.gnome.org/attachment.cgi?id=361877&action=edit
omx: add API to implement dynamic buffers support

OMX 1.2.0 introduced a third way to manage buffers by allowing
components to only allocate buffers header during their initialization
and change their pBuffer pointer at runtime.
This new feature can save us a copy between GStreamer and OMX for each
input buffer.

This patch adds API to allocate and use such buffers.

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