gst/udp/gstmultiudpsink.c: If a destination is added before the stream is set to PAUSED, the multicast group is not j...

Original commit message from CVS:
Patch by: Rob Taylor <robtaylor at floopily dot org>
* gst/udp/gstmultiudpsink.c: (join_multicast),
(gst_multiudpsink_init_send), (gst_multiudpsink_add):
If a destination is added before the stream is set to PAUSED, the
multicast group is not joined as the socket is not created yet.
Also TTL and LOOP should also be set. Fixes #346921.

ChangeLog

@@ -1,3 +1,13 @@
+2006-07-10  Wim Taymans  <wim@fluendo.com>
+
+	Patch by: Rob Taylor <robtaylor at floopily dot org>
+
+	* gst/udp/gstmultiudpsink.c: (join_multicast),
+	(gst_multiudpsink_init_send), (gst_multiudpsink_add):
+	If a destination is added before the stream is set to PAUSED, the
+	multicast group is not joined as the socket is not created yet. 
+	Also TTL and LOOP should also be set. Fixes #346921.
+
 2006-07-09  Zaheer Abbas Merali  <zaheerabbas at merali dot org>
 
 	* sys/ximage/gstximagesrc.c: (gst_ximage_src_ximage_get),

gst/udp/gstmultiudpsink.c

@@ -370,6 +370,26 @@ gst_multiudpsink_get_property (GObject * object, guint prop_id, GValue * value,
   }
 }
 
+static void
+join_multicast (GstUDPClient * client)
+{
+  unsigned char ttl = 64;
+  unsigned char loop = 1;
+
+  /* Joining the multicast group */
+  /* FIXME, can we use multicast and unicast over the same
+   * socket? if not, search for socket of this multicast group or
+   * create a new one. */
+  if (setsockopt (*(client->sock), IPPROTO_IP, IP_ADD_MEMBERSHIP,
+          &(client->multi_addr), sizeof (client->multi_addr)) < 0)
+    perror ("setsockopt IP_ADD_MEMBERSHIP\n");
+  if (setsockopt (*(client->sock), IPPROTO_IP, IP_MULTICAST_TTL, &ttl,
+          sizeof (ttl)) < 0)
+    perror ("setsockopt IP_MULTICAST_TTL\n");
+  if (setsockopt (*(client->sock), IPPROTO_IP, IP_MULTICAST_LOOP, &loop,
+          sizeof (loop)) < 0)
+    perror ("setsockopt IP_MULTICAST_LOOP\n");
+}
 
 /* create a socket for sending to remote machine */
 static gboolean
@@ -377,6 +397,8 @@ gst_multiudpsink_init_send (GstMultiUDPSink * sink)
 {
   guint bc_val;
   gint ret;
+  GList *clients;
+  GstUDPClient *client;
 
   /* create sender socket */
   if ((sink->sock = socket (AF_INET, SOCK_DGRAM, 0)) == -1)
@@ -391,8 +413,14 @@ gst_multiudpsink_init_send (GstMultiUDPSink * sink)
   sink->bytes_to_serve = 0;
   sink->bytes_served = 0;
 
-  return TRUE;
+  /* look for multicast clients and join multicast groups approptiately */
 
+  for (clients = sink->clients; clients; clients = g_list_next (clients)) {
+    client = (GstUDPClient *) clients->data;
+    if (client->multi_addr.imr_multiaddr.s_addr)
+      join_multicast (client);
+  }
+  return TRUE;
   /* ERRORS */
 no_socket:
   {
@@ -420,7 +448,6 @@ gst_multiudpsink_add (GstMultiUDPSink * sink, const gchar * host, gint port)
 {
   struct hostent *he;
   struct in_addr addr;
-  struct ip_mreq multi_addr;
   GstUDPClient *client;
   GTimeVal now;
 
@@ -431,6 +458,7 @@ gst_multiudpsink_add (GstMultiUDPSink * sink, const gchar * host, gint port)
   client->sock = &sink->sock;
 
   memset (&client->theiraddr, 0, sizeof (client->theiraddr));
+  memset (&client->multi_addr, 0, sizeof (client->multi_addr));
   client->theiraddr.sin_family = AF_INET;       /* host byte order */
   client->theiraddr.sin_port = htons (port);    /* short, network byte order */
 
@@ -441,20 +469,18 @@ gst_multiudpsink_add (GstMultiUDPSink * sink, const gchar * host, gint port)
   if (inet_aton (host, &addr)) {
     /* check if its a multicast address */
     if ((ntohl (addr.s_addr) & 0xe0000000) == 0xe0000000) {
+      printf ("multicast address  detected\n");
       client->multi_addr.imr_multiaddr.s_addr = addr.s_addr;
       client->multi_addr.imr_interface.s_addr = INADDR_ANY;
 
-      client->theiraddr.sin_addr = multi_addr.imr_multiaddr;
+      client->theiraddr.sin_addr = client->multi_addr.imr_multiaddr;
 
-      /* Joining the multicast group */
-      /* FIXME, can we use multicast and unicast over the same
-       * socket? if not, search for socket of this multicast group or
-       * create a new one. */
-      setsockopt (sink->sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &multi_addr,
-          sizeof (multi_addr));
     } else {
       client->theiraddr.sin_addr = *((struct in_addr *) &addr);
     }
+    /* if init_send has already been called, set sockopts for multicast */
+    if (*client->sock > 0)
+      join_multicast (client);
   }
   /* we dont need to lookup for localhost */
   else if (strcmp (host, "localhost") == 0 && inet_aton ("127.0.0.1", &addr)) {