[Bug 760005] rtsp-sdp: Implement clock signalling according to RFC7273

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760005

Sebastian Dröge (slomo) <slomo at coaxion.net> changed:

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 Attachment #318047|0                           |1
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--- Comment #2 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 318078
  --> https://bugzilla.gnome.org/attachment.cgi?id=318078&action=edit
rtsp-sdp: Implement clock signalling according to RFC7273

For NTP and PTP clocks we signal the actual clock that is used and signal
the direct media clock offset.

For all other clocks we at least signal that it's the local sender clock.

This allows receivers to know which clock was used to generate the media and
its RTP timestamps. Receivers can then implement network synchronization,
either absolute or at least relative by getting the sender clock rate directly
via NTP/PTP instead of estimating it from RTP timestamps and packet receive
times.

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