fix backchannel setup to use a custom pauseStream()

Author: Nils Schimmelmann

src/BackchannelServerMediaSubsession.cpp

@@ -366,6 +366,12 @@ void BackchannelServerMediaSubsession::deleteStream(unsigned clientSessionId, vo
     }
 }
 
+void BackchannelServerMediaSubsession::pauseStream(unsigned /*clientSessionId*/,
+                                                   void * /*streamToken*/)
+{
+    // We do not support PAUSE in this subsession
+}
+
 void BackchannelServerMediaSubsession::getRTPSinkandRTCP(void *streamToken,
                                                          RTPSink *&rtpSink,
                                                          RTCPInstance *&rtcp)

src/BackchannelServerMediaSubsession.hpp

@@ -57,6 +57,7 @@ class BackchannelServerMediaSubsession : public OnDemandServerMediaSubsession
                              ServerRequestAlternativeByteHandler *serverRequestAlternativeByteHandler,
                              void *serverRequestAlternativeByteHandlerClientData);
     virtual void deleteStream(unsigned clientSessionId, void *&streamToken);
+    virtual void pauseStream(unsigned clientSessionId, void *streamToken);
 
     virtual void getRTPSinkandRTCP(void *streamToken, RTPSink *&rtpSink, RTCPInstance *&rtcp);
     virtual FramedSource *createNewStreamSource(unsigned clientSessionId, unsigned &estBitrate);