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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #3 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
Created attachment 369936
  --> https://bugzilla.gnome.org/attachment.cgi?id=369936&action=edit
baseaudiopayload: expose a prepare_output_buffer virtual method

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