gst/rtpmanager/: When an SSRC is found on the caps of the sender RTP, use this as the internal SSRC. Fixes #565910.

Original commit message from CVS:
Patch by: Olivier Crete <tester at tester dot ca>
* gst/rtpmanager/gstrtpsession.c:
(gst_rtp_session_setcaps_send_rtp), (create_send_rtp_sink):
* gst/rtpmanager/rtpsession.c: (rtp_session_set_internal_ssrc):
When an SSRC is found on the caps of the sender RTP, use this as the
internal SSRC. Fixes #565910.

2 files changed, 28 insertions, 0 deletions

diff --git a/gst/rtpmanager/gstrtpsession.c b/gst/rtpmanager/gstrtpsession.c
index c1ca0ebb..615dc15a 100644
--- a/gst/rtpmanager/gstrtpsession.c
+++ b/gst/rtpmanager/gstrtpsession.c
@@ -1675,6 +1675,27 @@ gst_rtp_session_getcaps_send_rtp (GstPad * pad)
   return result;
 }
 
+static gboolean
+gst_rtp_session_setcaps_send_rtp (GstPad * pad, GstCaps * caps)
+{
+  GstRtpSession *rtpsession;
+  GstRtpSessionPrivate *priv;
+  GstStructure *s = gst_caps_get_structure (caps, 0);
+  guint ssrc;
+
+  rtpsession = GST_RTP_SESSION (gst_pad_get_parent (pad));
+  priv = rtpsession->priv;
+
+  if (gst_structure_get_uint (s, "ssrc", &ssrc)) {
+    GST_DEBUG_OBJECT (rtpsession, "setting internal SSRC to %08x", ssrc);
+    rtp_session_set_internal_ssrc (priv->session, ssrc);
+  }
+
+  gst_object_unref (rtpsession);
+
+  return TRUE;
+}
+
 /* Recieve an RTP packet to be send to the receivers, send to RTP session
  * manager and forward to send_rtp_src.
  */
@@ -1852,6 +1873,8 @@ create_send_rtp_sink (GstRtpSession * rtpsession)
       gst_rtp_session_chain_send_rtp);
   gst_pad_set_getcaps_function (rtpsession->send_rtp_sink,
       gst_rtp_session_getcaps_send_rtp);
+  gst_pad_set_setcaps_function (rtpsession->send_rtp_sink,
+      gst_rtp_session_setcaps_send_rtp);
   gst_pad_set_event_function (rtpsession->send_rtp_sink,
       (GstPadEventFunction) gst_rtp_session_event_send_rtp_sink);
   gst_pad_set_internal_link_function (rtpsession->send_rtp_sink,
diff --git a/gst/rtpmanager/rtpsession.c b/gst/rtpmanager/rtpsession.c
index c57c9966..bd72ed98 100644
--- a/gst/rtpmanager/rtpsession.c
+++ b/gst/rtpmanager/rtpsession.c
@@ -1209,9 +1209,14 @@ rtp_session_set_internal_ssrc (RTPSession * sess, guint32 ssrc)
     g_hash_table_steal (sess->ssrcs[sess->mask_idx],
         GINT_TO_POINTER (sess->source->ssrc));
 
+    GST_DEBUG ("setting internal SSRC to %08x", ssrc);
+    /* After this call, any receiver of the old SSRC either in RTP or RTCP
+     * packets will timeout on the old SSRC, we could potentially schedule a
+     * BYE RTCP for the old SSRC... */
     sess->source->ssrc = ssrc;
     rtp_source_reset (sess->source);
 
+    /* rehash with the new SSRC */
     g_hash_table_insert (sess->ssrcs[sess->mask_idx],
         GINT_TO_POINTER (sess->source->ssrc), sess->source);
   }