rtprtxsend: Add an rtx-ssrc property to allow external control of the ssrc

This is useful when one needs to know the SSRC beforehands, so that it can
be used for SRTP for example.

diff --git a/gst/rtpmanager/gstrtprtxsend.c b/gst/rtpmanager/gstrtprtxsend.c
index a4a0290..bb4d92c 100644 (file)
--- a/gst/rtpmanager/gstrtprtxsend.c
+++ b/gst/rtpmanager/gstrtprtxsend.c
@@ -55,6 +55,7 @@ GST_DEBUG_CATEGORY_STATIC (gst_rtp_rtx_send_debug);
 enum
 {
   PROP_0,
+  PROP_RTX_SSRC,
   PROP_RTX_PAYLOAD_TYPE,
   PROP_MAX_SIZE_TIME,
   PROP_MAX_SIZE_PACKETS,
@@ -120,6 +121,12 @@ gst_rtp_rtx_send_class_init (GstRtpRtxSendClass * klass)
   gobject_class->set_property = gst_rtp_rtx_send_set_property;
   gobject_class->finalize = gst_rtp_rtx_send_finalize;
 
+  g_object_class_install_property (gobject_class, PROP_RTX_SSRC,
+      g_param_spec_uint ("rtx-ssrc", "Retransmission SSRC",
+          "SSRC of the retransmission stream for SSRC-multiplexed mode "
+          "(default = random)", 0, G_MAXUINT, -1,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
   g_object_class_install_property (gobject_class, PROP_RTX_PAYLOAD_TYPE,
       g_param_spec_uint ("rtx-payload-type", "RTX Payload Type",
           "Payload type of the retransmission stream (fmtp in SDP)", 0,
@@ -565,6 +572,11 @@ gst_rtp_rtx_send_get_property (GObject * object,
   GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
 
   switch (prop_id) {
+    case PROP_RTX_SSRC:
+      g_mutex_lock (&rtx->lock);
+      g_value_set_uint (value, rtx->rtx_ssrc);
+      g_mutex_unlock (&rtx->lock);
+      break;
     case PROP_RTX_PAYLOAD_TYPE:
       g_mutex_lock (&rtx->lock);
       g_value_set_uint (value, rtx->rtx_payload_type_pending);
@@ -603,6 +615,11 @@ gst_rtp_rtx_send_set_property (GObject * object,
   GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
 
   switch (prop_id) {
+    case PROP_RTX_SSRC:
+      g_mutex_lock (&rtx->lock);
+      rtx->rtx_ssrc = g_value_get_uint (value);
+      g_mutex_unlock (&rtx->lock);
+      break;
     case PROP_RTX_PAYLOAD_TYPE:
       g_mutex_lock (&rtx->lock);
       rtx->rtx_payload_type_pending = g_value_get_uint (value);