Revert "udp: add multicast input interface selection"

This reverts commit 9abd47fe.

Broke compilation on openbsd and others

libavformat/udp.c

@@ -35,16 +35,6 @@
 #include <unistd.h>
 #include "internal.h"
 #include "network.h"
-
-
-#ifdef WIN32
-#   define if_nametoindex( str ) atoi( str )
-#else
-#   include <unistd.h>
-#   include <net/if.h>
-#endif
-
-
 #include "os_support.h"
 #include "url.h"
 
@@ -110,12 +100,11 @@ static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
     return 0;
 }
 
-static int udp_join_multicast_group(int sockfd, struct sockaddr *addr, int miface_nr)
+static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
 {
 #ifdef IP_ADD_MEMBERSHIP
     if (addr->sa_family == AF_INET) {
         struct ip_mreq mreq;
-        struct group_req gr;
 
         mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
         mreq.imr_interface.s_addr= INADDR_ANY;
@@ -123,16 +112,6 @@ static int udp_join_multicast_group(int sockfd, struct sockaddr *addr, int mifac
             av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
             return -1;
         }
-
-#ifdef MCAST_JOIN_GROUP
-        memset(&gr, 0, sizeof(struct group_req));
-        gr.gr_interface = miface_nr;
-        memcpy(&gr.gr_group, addr, sizeof(struct sockaddr_in));
-        if (setsockopt(sockfd, SOL_IP, MCAST_JOIN_GROUP, &gr, sizeof(struct group_req)) < 0) {
-            av_log(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_GROUP): %s\n", strerror(errno));
-            return -1;
-        }
-#endif
     }
 #endif
 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
@@ -280,7 +259,6 @@ static int udp_port(struct sockaddr_storage *addr, int addr_len)
  * option: 'ttl=n'       : set the ttl value (for multicast only)
  *         'localport=n' : set the local port
  *         'pkt_size=n'  : set max packet size
- *         'miface=if'   : set multicast input interface
  *         'reuse=1'     : enable reusing the socket
  *
  * @param h media file context
@@ -423,7 +401,6 @@ static int udp_open(URLContext *h, const char *uri, int flags)
     struct sockaddr_storage my_addr;
     int len;
     int reuse_specified = 0;
-    int miface_nr = 0;
 
     h->is_streamed = 1;
     h->max_packet_size = 1472;
@@ -466,9 +443,6 @@ static int udp_open(URLContext *h, const char *uri, int flags)
         if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
             av_strlcpy(localaddr, buf, sizeof(localaddr));
         }
-        if (av_find_info_tag(buf, sizeof(buf), "miface", p)) {
-            miface_nr = if_nametoindex (buf);
-        }
     }
 
     /* fill the dest addr */
@@ -526,7 +500,7 @@ static int udp_open(URLContext *h, const char *uri, int flags)
         }
         if (h->flags & AVIO_FLAG_READ) {
             /* input */
-            if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr, miface_nr) < 0)
+            if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
                 goto fail;
         }
     }