确保webrtc关闭udp模式时可用

webrtc/WebRtcTransport.cpp

@@ -544,8 +544,9 @@ void WebRtcTransportImp::onCheckAnswer(RtcSession &sdp) {
         m.rtcp_addr.reset();
         m.rtcp_addr.address = m.addr.address;
 
-        GET_CONFIG(uint16_t, local_port, Rtc::kPort);
-        m.rtcp_addr.port = local_port;
+        GET_CONFIG(uint16_t, udp_port, Rtc::kPort);
+        GET_CONFIG(uint16_t, tcp_port, Rtc::kTcpPort);
+        m.rtcp_addr.port = udp_port ? udp_port : tcp_port;
         m.port = m.rtcp_addr.port;
         sdp.origin.address = m.addr.address;
     }