[Bug 738319] New: rtpsession: fix Early Feedback Transmission

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738319
  GStreamer | gst-plugins-good | 1.4.1

           Summary: rtpsession: fix Early Feedback Transmission
    Classification: Platform
           Product: GStreamer
           Version: 1.4.1
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: mparisdiaz at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=288248)
 View: https://bugzilla.gnome.org/attachment.cgi?id=288248
 Review: https://bugzilla.gnome.org/review?bug=738319&attachment=288248

First patch to fix the problem

My work team and I have detected a problem which causes that a lot of NACK
packets are sent when the limit of the network bandwidth is reached.

The NACK requests are caused because the jitterbuffer is requesting a lot of
retransmissions. This behaviour is a bug related with:
https://bugzilla.gnome.org/show_bug.cgi?id=735378

Moreover, we have detected a bug in the implementation of the Early Feedback
Transmission (RTCP) which must follow this part of the RFC:
http://tools.ietf.org/html/rfc4585#section-3.5.2

The current implementation does not do Part 6, so a lot of early RTCP pakets
are sent. We propose an initial patch which is closer to the RFC, but it does
not follow "MUST recalculate tn = tp + 2*T_rr, and MUST set tp to the previous
tn" yet.

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