[Bug 720655] New: jitterbuffer fails to send lost event downstream after large gap

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=720655
  GStreamer | gst-plugins-good | 1.2.1

           Summary: jitterbuffer fails to send lost event downstream after
                    large gap
    Classification: Platform
           Product: GStreamer
           Version: 1.2.1
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: gratias13 at hushmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


When both 'do-lost' and 'do-retransmission' are true, the gstrtpjitterbuffer
will fail to send the lost event downstream after a gap that exceeds the
latency window.

The gap results in the creation of two lost events, the first for the last
packet prior to gap, and the second for all packets considered lost by
calculate_expected().  The first is pushed downstream as expected, resulting in
an update to priv->next_seqnum.  The second is pulled by handle_next_buffer(),
but is not pushed because its seqnum < priv->next_seqnum, which results in it
being treated as an old packet.

The problem after this is no new packets are pushed downstream because the
priv->next_seqnum is stuck at an old seqnum.

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