Remove the "multicast=" tag from UDP and RTP URLs

Originally committed as revision 12830 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtpproto.c

@@ -84,28 +84,25 @@ static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
 
 static void build_udp_url(char *buf, int buf_size,
                           const char *hostname, int port,
-                          int local_port, int multicast, int ttl)
+                          int local_port, int ttl)
 {
     snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
     if (local_port >= 0)
         url_add_option(buf, buf_size, "localport=%d", local_port);
-    if (multicast)
-        url_add_option(buf, buf_size, "multicast=1");
     if (ttl >= 0)
         url_add_option(buf, buf_size, "ttl=%d", ttl);
 }
 
 /*
  * url syntax: rtp://host:port[?option=val...]
- * option: 'multicast=1' : enable multicast
- *         'ttl=n'       : set the ttl value (for multicast only)
+ * option: 'ttl=n'       : set the ttl value (for multicast only)
  *         'localport=n' : set the local port to n
  *
  */
 static int rtp_open(URLContext *h, const char *uri, int flags)
 {
     RTPContext *s;
-    int port, is_output, is_multicast, ttl, local_port;
+    int port, is_output, ttl, local_port;
     char hostname[256];
     char buf[1024];
     char path[1024];
@@ -121,12 +118,10 @@ static int rtp_open(URLContext *h, const char *uri, int flags)
     url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
               path, sizeof(path), uri);
     /* extract parameters */
-    is_multicast = 0;
     ttl = -1;
     local_port = -1;
     p = strchr(uri, '?');
     if (p) {
-        is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
         if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
             ttl = strtol(buf, NULL, 10);
         }
@@ -136,7 +131,7 @@ static int rtp_open(URLContext *h, const char *uri, int flags)
     }
 
     build_udp_url(buf, sizeof(buf),
-                  hostname, port, local_port, is_multicast, ttl);
+                  hostname, port, local_port, ttl);
     if (url_open(&s->rtp_hd, buf, flags) < 0)
         goto fail;
     local_port = udp_get_local_port(s->rtp_hd);
@@ -145,7 +140,7 @@ static int rtp_open(URLContext *h, const char *uri, int flags)
     /* well, should suppress localport in path */
 
     build_udp_url(buf, sizeof(buf),
-                  hostname, port + 1, local_port + 1, is_multicast, ttl);
+                  hostname, port + 1, local_port + 1, ttl);
     if (url_open(&s->rtcp_hd, buf, flags) < 0)
         goto fail;
 

libavformat/rtsp.c

@@ -973,7 +973,7 @@ make_setup_request (AVFormatContext *s, const char *host, int port, int protocol
                 struct in_addr in;
 
                 in.s_addr = htonl(reply->transports[0].destination);
-                snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
+                snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
                          inet_ntoa(in),
                          reply->transports[0].port_min,
                          reply->transports[0].ttl);
@@ -1413,7 +1413,7 @@ static int sdp_read_header(AVFormatContext *s,
     for(i=0;i<rt->nb_rtsp_streams;i++) {
         rtsp_st = rt->rtsp_streams[i];
 
-        snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
+        snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
                  inet_ntoa(rtsp_st->sdp_ip),
                  rtsp_st->sdp_port,
                  rtsp_st->sdp_ttl);

libavformat/udp.c

@@ -27,6 +27,12 @@
 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
 #endif
+#ifndef IN_MULTICAST
+#define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
+#endif
+#ifndef IN6_IS_ADDR_MULTICAST
+#define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
+#endif
 
 typedef struct {
     int udp_fd;
@@ -159,6 +165,18 @@ static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int
     return addr_len;
 }
 
+static int is_multicast_address(struct sockaddr_storage *addr)
+{
+    if (addr->ss_family == AF_INET) {
+        return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
+    }
+    if (addr->ss_family == AF_INET6) {
+        return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
+    }
+
+    return 0;
+}
+
 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, int *addr_len)
 {
     int udp_fd = -1;
@@ -219,6 +237,11 @@ static int udp_set_url(struct sockaddr_in *addr, const char *hostname, int port)
     return sizeof(struct sockaddr_in);
 }
 
+static int is_multicast_address(struct sockaddr_in *addr)
+{
+    return IN_MULTICAST(ntohl(addr->sin_addr.s_addr));
+}
+
 static int udp_socket_create(UDPContext *s, struct sockaddr_in *addr, int *addr_len)
 {
     int fd;
@@ -248,8 +271,7 @@ static int udp_port(struct sockaddr_in *addr, int len)
  * the remote server address.
  *
  * url syntax: udp://host:port[?option=val...]
- * option: 'multicast=1' : enable multicast
- *         'ttl=n'       : set the ttl value (for multicast only)
+ * option: 'ttl=n'       : set the ttl value (for multicast only)
  *         'localport=n' : set the local port
  *         'pkt_size=n'  : set max packet size
  *         'reuse=1'     : enable reusing the socket
@@ -271,6 +293,7 @@ int udp_set_remote_url(URLContext *h, const char *uri)
     if (s->dest_addr_len < 0) {
         return AVERROR(EIO);
     }
+    s->is_multicast = is_multicast_address(&s->dest_addr);
 
     return 0;
 }
@@ -327,7 +350,6 @@ static int udp_open(URLContext *h, const char *uri, int flags)
     s->ttl = 16;
     p = strchr(uri, '?');
     if (p) {
-        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
         s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
         if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
             s->ttl = strtol(buf, NULL, 10);
@@ -346,7 +368,7 @@ static int udp_open(URLContext *h, const char *uri, int flags)
     /* XXX: fix url_split */
     if (hostname[0] == '\0' || hostname[0] == '?') {
         /* only accepts null hostname if input */
-        if (s->is_multicast || (flags & URL_WRONLY))
+        if (flags & URL_WRONLY)
             goto fail;
     } else {
         udp_set_remote_url(h, uri);