[Bug 794545] baseaudiopayload: refactor to let subclasses prepare the output buffer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794545

--- Comment #7 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Olivier Crête from comment #5)
> Do you have a subclass that uses this? I'm not sure I understand why you
> want to do this?

Patches to follow. Mathieu has a patch to expose a buffer pool from rtppcmapay
that returns a buffer to alawenc, and which has space before the beginning for
the RTP header. So alawenc writes into the buffer, and rtppcmapay can directly
write into the memory before that for the RTP header. Without any additional
allocations or copying.

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