Send NAT punching messages to the address specified in the Transport:

message, if available (RFC 2326, section 12.39), fixes issue 2212.

Patch by John Wimer <john at god vtic net>.

Originally committed as revision 25032 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtsp.h

@@ -97,6 +97,7 @@ typedef struct RTSPTransportField {
     int ttl;
 
     struct sockaddr_storage destination; /**< destination IP address */
+    char source[INET6_ADDRSTRLEN + 1]; /**< source IP address */
 
     /** data/packet transport protocol; e.g. RTP or RDT */
     enum RTSPTransport transport;