Reduced-size RTCP (RFC5506) support

[Olivier Crête]

Hi Sebastian,

Are you certain that setting the profile enables reduced size rtcp ?


If I read the code correctly and it doesn't, you can enable it with the
following:

GObject *isess = NULL;
g_signal_emit_by_name (rtpbin, "get-internal-session", 1, &isess);
g_object_set (isess, "reduced-size-rtcp, TRUE, NULL);
g_object_unref (isess);

Olivier

On Mon, 2019-02-04 at 17:56 +0100, Sebastian Dröge wrote:
> On Mon, 2019-02-04 at 06:14 -0600, Ingemar Johansson wrote:
> > New to this list and a relative newbie to GStreamer development. I am
> > working on an implementation of a SCReAM GStreamer plugin. SCReAM
> > (https://tools.ietf.org/html/rfc8298) is a congestion control algorithm for
> > realtime low latency media such as video.
> > 
> > I have reach so far that I am able to insert the SCReAM plugin in both the
> > TX and the RX side and I also manage to piggyback RTCP feedback packets
> > (https://tools.ietf.org/wg/avtcore/draft-ietf-avtcore-cc-feedback-message/)
> > to the normal RTCP RR+SDES packets. 
> 
> There is a SCReAM implementation available from here:
>   https://github.com/EricssonResearch/openwebrtc-gst-plugins/tree/master/gst/scream
> But you're probably aware of that already :)
> 
> > I need however to enable reduced-size RTCP (RFC5506) to keep the RTCP
> > overhead reasonably small, given that the feedback rate in SCReAM is quite
> > high at high bitrates.
> > 
> > Is there any documentation or examples available that can shed a
> > light on this ?
> 
> You have to set the RTP profile on the rtpbin (before creating any
> sessions) to AVPF or SAVPF. The "rtp-profile" property. That will then
> enable the possibility to send reduced size, early RTCP packets for
> feedback that is to be sent out before the next regular, big RTCP
> packet is to be sent.
> 
> There are signals for requesting early RTCP (or generally RTCP) and you
> can then attach your additional feedback to those packets.
> 
> 
> Note that rtpsession ensures that no more packets than allowed are sent
> and also that there's regular RTCP as often as required by the RTP
> RFCs.
> 
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-- 
Olivier Crête
olivier.crete at collabora.com
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