MT#64278 AmRtpStream: optionally don't generate direciton

Introduce a config option to skip generating
the direction paramter in case when SEMS
generates local SDP offer or answer.

Change-Id: Ifcba27cd6ad0070bead182d60ad3dc5ee57b41bc

core/AmConfig.cpp

@@ -106,6 +106,8 @@ bool         AmConfig::LogSessions             = false;
 bool         AmConfig::LogEvents               = false;
 int          AmConfig::UnhandledReplyLoglevel  = 0;
 
+bool         AmConfig::SkipGenerateDirectionBoth = false;
+
 #ifdef WITH_ZRTP
 bool         AmConfig::enable_zrtp             = true;
 bool         AmConfig::enable_zrtp_debuglog    = true;
@@ -406,6 +408,10 @@ int AmConfig::readConfiguration()
     ForceSymmetricRtp = (cfg.getParameter("force_symmetric_rtp") == "yes");
   }
 
+  if(cfg.hasParameter("skip_generate_direction_both")) {
+    SkipGenerateDirectionBoth = (cfg.getParameter("skip_generate_direction_both") == "yes");
+  }
+
   if(cfg.hasParameter("sip_nat_handling")) {
     SipNATHandling = (cfg.getParameter("sip_nat_handling") == "yes");
   }

core/AmConfig.h

@@ -206,6 +206,8 @@ struct AmConfig
   static bool SingleCodecInOK;
   static vector <string> CodecOrder;
 
+  static bool SkipGenerateDirectionBoth;
+
   enum ApplicationSelector {
     App_RURIUSER,
     App_RURIPARAM,

core/AmRtpStream.cpp

@@ -385,9 +385,14 @@ void AmRtpStream::getSdp(SdpMedia& m)
   m.nports = 0;
   m.send = !hold;
   m.recv = receiving;
-  m.dir = SdpMedia::DirBoth;
   m.type = MT_AUDIO;
 
+  // direction
+  if (AmConfig::SkipGenerateDirectionBoth)
+    m.dir = SdpMedia::DirUndefined;
+  else
+    m.dir = SdpMedia::DirBoth;
+
   // get Transport description
   if (rtp_transport)
     rtp_transport->getDescription(m);