From 29eaf994f826a3cb9f4d67e51c12bde3f656a571 Mon Sep 17 00:00:00 2001
From: Rolf Ahrenberg <Rolf.Ahrenberg@sci.fi>
Date: Sun, 21 Dec 2014 16:31:38 +0200
Subject: [PATCH] Added a multicast mode for the RTSP setup.

---
 rtsp.c | 15 ++++++++++++++-
 rtsp.h |  2 ++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/rtsp.c b/rtsp.c
index fdf22aa..e437d6b 100644
--- a/rtsp.c
+++ b/rtsp.c
@@ -15,6 +15,7 @@
 
 cSatipRtsp::cSatipRtsp(cSatipTunerIf &tunerP)
 : tunerM(tunerP),
+  modeM(cmUnicast),
   handleM(NULL),
   headerListM(NULL)
 {
@@ -191,10 +192,22 @@ bool cSatipRtsp::Setup(const char *uriP, int rtpPortP, int rtcpPortP)
   bool result = false;
 
   if (handleM && !isempty(uriP)) {
+     cString transport;
      long rc = 0;
      cTimeMs processing(0);
      CURLcode res = CURLE_OK;
-     cString transport = cString::sprintf("RTP/AVP;unicast;client_port=%d-%d", rtpPortP, rtcpPortP);
+
+     switch (modeM) {
+       case cmMulticast:
+            // RTP/AVP;multicast;destination=<IP multicast address>;port=<RTP port>-<RTCP port>;ttl=<ttl>
+            transport = cString::sprintf("RTP/AVP;multicast;port=%d-%d", rtpPortP, rtcpPortP);
+            break;
+       default:
+       case cmUnicast:
+            // RTP/AVP;unicast;client_port=<client RTP port>-<client RTCP port>
+            transport = cString::sprintf("RTP/AVP;unicast;client_port=%d-%d", rtpPortP, rtcpPortP);
+            break;
+       }
 
      // Setup media stream
      SATIP_CURL_EASY_SETOPT(handleM, CURLOPT_RTSP_STREAM_URI, uriP);
diff --git a/rtsp.h b/rtsp.h
index 659c644..1d1be4d 100644
--- a/rtsp.h
+++ b/rtsp.h
@@ -26,8 +26,10 @@ private:
   enum {
     eConnectTimeoutMs = 1500,  // in milliseconds
   };
+  enum eCommunicationMode { cmUnicast, cmMulticast };
 
   cSatipTunerIf &tunerM;
+  eCommunicationMode modeM;
   CURL *handleM;
   struct curl_slist *headerListM;