[Bug 761947] rtpbasepayload: rtpbasedepayload: Add source-info property

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761947

--- Comment #5 from Stian Selnes (stianse) <stian.selnes at gmail.com> ---
Created attachment 338605
  --> https://bugzilla.gnome.org/attachment.cgi?id=338605&action=edit
rtpbasepayload: rtpbasedepayload: Add source-info property

Add a source-info property that will read/write meta to the buffers
about RTP source information. The GstRTPSourceMeta can be used to
transport information about the origin of a buffer, e.g. the sources
that is included in a mixed audio buffer.

A new function gst_rtp_base_payload_allocate_output_buffer() is added
for payloaders to use to allocate the output RTP buffer with the correct
number of CSRCs according to the meta and fill it.

RTPSourceMeta does not make sense on RTP buffers since the information
is in the RTP header. So the payloader will strip the meta from the
output buffer.

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