[Bug 647252] New: make udpsink generate keep alive packets

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=647252
  GStreamer | gst-plugins-good | git

           Summary: make udpsink generate keep alive packets
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: bug-track at fisher-privat.net
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


It is important for VoIP to keep hole in firewall/nat. To do this we need to
send some think to get it back.
Current empathy ill encode sound (or even silence) and send this stream just to
recive other stream. In some situations this produce too big/useless overhead
on network.

Maximum what we need is empty udp packet. No rtp, or even audio in it.

Current speex already has integrated silence detection, and generate empty
packets with GAP flag. Current rtpspeexpay will drop this packets (after my
patch, see Bug 646474). So probably i should change rtpspeexpay to generate
keep alive event on GAP packet. And udpsink if it recive this event should send
just empty udp packet.

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