[gstreamer-bugs] [Bug 596072] New: [rtpmux] : add ssrc to outcaps, get ssrc from downstream

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=596072
  GStreamer | gst-plugins-bad | git

           Summary: [rtpmux] : add ssrc to outcaps, get ssrc from
                    downstream
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: gstelzz at yahoo.fr
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


GST_DEBUG=rtpsource:5,rtpmux:5 gst-launch -v gstrtpbin name=rtpbin audiotestsrc
is-live=TRUE ! alawenc   ! rtppcmapay ! rtpdtmfmux  ! rtpbin.send_rtp_sink_0
rtpbin.send_rtp_src_0 ! fakesink

0:00:00.067093320 31560  0x9b26b48 LOG                rtpsource
rtpsource.c:1215:rtp_source_send_rtp: SSRC 428ed59e, RTP 2275625440, NTP
961859:30:57.147132128
0:00:00.067177096 31560  0x9b26b48 LOG                rtpsource
rtpsource.c:1252:rtp_source_send_rtp: updating SSRC from 22c40154 to 428ed59e,
fix the payloader

rtpmux (and so rtpdtmfmux) sets its own ssrc into output buffers, without
updating the caps for downstream information, nor checking for a ssrc from
downstream (rtpsource/rtpsession).

Therefore, rtpsource receives buffers with unexpected ssrc.

Setting ssrc on out caps provides the ssrc information downstream.
Checking ssrc on peer pad get SSRC from downstream.


Patch attached

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