rtsp: Parse the mode=receive/record parameter in transport lines

We need to support the nonstandard mode=receive, for compatibility
with older libavformat clients.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/rtsp.c

@@ -749,6 +749,14 @@ static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
                     get_word_sep(buf, sizeof(buf), ";,", &p);
                     av_strlcpy(th->source, buf, sizeof(th->source));
                 }
+            } else if (!strcmp(parameter, "mode")) {
+                if (*p == '=') {
+                    p++;
+                    get_word_sep(buf, sizeof(buf), ";, ", &p);
+                    if (!strcmp(buf, "record") ||
+                        !strcmp(buf, "receive"))
+                        th->mode_record = 1;
+                }
             }
 
             while (*p != ';' && *p != '\0' && *p != ',')

libavformat/rtsp.h

@@ -102,6 +102,9 @@ typedef struct RTSPTransportField {
      * packets will be allowed to make before being discarded. */
     int ttl;
 
+    /** transport set to record data */
+    int mode_record;
+
     struct sockaddr_storage destination; /**< destination IP address */
     char source[INET6_ADDRSTRLEN + 1]; /**< source IP address */