diff --git a/inc/V4l2RTSPServer.h b/inc/V4l2RTSPServer.h
index e13eeb5..868a876 100644
--- a/inc/V4l2RTSPServer.h
+++ b/inc/V4l2RTSPServer.h
@@ -164,7 +164,42 @@ class V4l2RTSPServer {
             return this->addSession(url, subSession);
         }	
 
- 
+        void decodeMulticastUrl(const std::string & maddr, in_addr & destinationAddress, unsigned short & rtpPortNum, unsigned short & rtcpPortNum)
+        {
+            std::istringstream is(maddr);
+            std::string ip;
+            getline(is, ip, ':');						
+            if (!ip.empty())
+            {
+                destinationAddress.s_addr = inet_addr(ip.c_str());
+            } else {
+                destinationAddress.s_addr = chooseRandomIPv4SSMAddress(*this->env());
+            }	
+            
+            rtpPortNum = 20000;
+            std::string port;
+            getline(is, port, ':');						
+            if (!port.empty())
+            {
+                rtpPortNum = atoi(port.c_str());
+            }	
+            rtcpPortNum = rtpPortNum+1;
+            getline(is, port, ':');						
+            if (!port.empty())
+            {
+                rtcpPortNum = atoi(port.c_str());
+            }
+        }
+
+        ServerMediaSession* AddMulticastSession(const std::string& url, std::string& multicasturi, StreamReplicator* videoReplicator, StreamReplicator* audioReplicator) {
+			struct in_addr destinationAddress;
+			unsigned short rtpPortNum;
+			unsigned short rtcpPortNum;
+            this->decodeMulticastUrl(multicasturi, destinationAddress, rtpPortNum, rtcpPortNum);
+            multicasturi = inet_ntoa(destinationAddress) + std::string(":") + std::to_string(rtpPortNum) + std::string(":") + std::to_string(rtcpPortNum);
+            return this->AddMulticastSession(url, destinationAddress, rtpPortNum, rtcpPortNum, videoReplicator, audioReplicator);
+        }
+
         // -----------------------------------------
         //    get rtsp url
         // -----------------------------------------
diff --git a/main.cpp b/main.cpp
index a6bbbb6..6de2c47 100755
--- a/main.cpp
+++ b/main.cpp
@@ -45,29 +45,6 @@ void sighandler(int n)
 	quit =1;
 }
 
-// -------------------------------------------------------
-//    decode multicast url <group>:<rtp_port>:<rtcp_port>
-// -------------------------------------------------------
-void decodeMulticastUrl(const std::string & maddr, in_addr & destinationAddress, unsigned short & rtpPortNum, unsigned short & rtcpPortNum)
-{
-	std::istringstream is(maddr);
-	std::string ip;
-	getline(is, ip, ':');						
-	if (!ip.empty())
-	{
-		destinationAddress.s_addr = inet_addr(ip.c_str());
-	}						
-	
-	std::string port;
-	getline(is, port, ':');						
-	rtpPortNum = 20000;
-	if (!port.empty())
-	{
-		rtpPortNum = atoi(port.c_str());
-	}	
-	rtcpPortNum = rtpPortNum+1;
-}
-
 // -------------------------------------------------------
 //    split video,audio device
 // -------------------------------------------------------
@@ -280,10 +257,9 @@ int main(int argc, char** argv)
 	{		
 		// decode multicast info
 		struct in_addr destinationAddress;
-		destinationAddress.s_addr = chooseRandomIPv4SSMAddress(*rtspServer.env());
-		unsigned short rtpPortNum = 20000;
-		unsigned short rtcpPortNum = rtpPortNum+1;
-		decodeMulticastUrl(maddr, destinationAddress, rtpPortNum, rtcpPortNum);	
+		unsigned short rtpPortNum;
+		unsigned short rtcpPortNum;
+		rtspServer.decodeMulticastUrl(maddr, destinationAddress, rtpPortNum, rtcpPortNum);	
 
 		std::list<V4l2Output*> outList;
 		int nbSource = 0;