Supply a User-Agent header when opening rtsp streams.

Some rtsp servers like the IP Cam IcyBox IB-CAM2002 need it.
Fixes ticket #2761.
Reported, analyzed and tested by trac user imavra.

libavformat/rtsp.c

@@ -62,6 +62,8 @@
 #define DEC AV_OPT_FLAG_DECODING_PARAM
 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 
+#define DEFAULT_USER_AGENT "Lavf/" AV_STRINGIFY(LIBAVFORMAT_VERSION)
+
 #define RTSP_FLAG_OPTS(name, longname) \
     { name, longname, OFFSET(rtsp_flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, DEC, "rtsp_flags" }, \
     { "filter_src", "Only receive packets from the negotiated peer IP", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_FILTER_SRC}, 0, 0, DEC, "rtsp_flags" }, \
@@ -91,6 +93,7 @@ const AVOption ff_rtsp_options[] = {
     { "timeout", "Maximum timeout (in seconds) to wait for incoming connections. -1 is infinite. Implies flag listen", OFFSET(initial_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, DEC },
     { "stimeout", "timeout (in micro seconds) of socket i/o operations.", OFFSET(stimeout), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
     RTSP_REORDERING_OPTS(),
+    { "user-agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = DEFAULT_USER_AGENT}, 0, 0, DEC },
     { NULL },
 };
 

libavformat/rtsp.h

@@ -399,6 +399,11 @@ typedef struct RTSPState {
      * Size of RTP packet reordering queue.
      */
     int reordering_queue_size;
+
+    /**
+     * User-Agent string
+     */
+    char *user_agent;
 } RTSPState;
 
 #define RTSP_FLAG_FILTER_SRC  0x1    /**< Filter incoming UDP packets -

libavformat/rtspdec.c

@@ -574,6 +574,8 @@ int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
     /* describe the stream */
     snprintf(cmd, sizeof(cmd),
              "Accept: application/sdp\r\n");
+    av_strlcatf(cmd, sizeof(cmd),
+                "User-Agent: %s\r\n", rt->user_agent);
     if (rt->server_type == RTSP_SERVER_REAL) {
         /**
          * The Require: attribute is needed for proper streaming from

libavformat/version.h

@@ -31,7 +31,7 @@
 
 #define LIBAVFORMAT_VERSION_MAJOR 55
 #define LIBAVFORMAT_VERSION_MINOR 12
-#define LIBAVFORMAT_VERSION_MICRO 101
+#define LIBAVFORMAT_VERSION_MICRO 102
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \