-static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
-#ifdef IP_MULTICAST_TTL
- if (addr->sa_family == AF_INET) {
- if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
- av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
- return -1;
- }
- }
-#endif
-#if CONFIG_IPV6
- if (addr->sa_family == AF_INET6) {
- if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
- av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
- return -1;
- }
- }
-#endif
- return 0;
-}
-
-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;
-
- mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
- mreq.imr_interface.s_addr= INADDR_ANY;
- if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
- av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
- return -1;
- }
- }
-#endif
-#if CONFIG_IPV6
- if (addr->sa_family == AF_INET6) {
- struct ipv6_mreq mreq6;
-
- memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
- mreq6.ipv6mr_interface= 0;
- if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
- av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
- return -1;
- }
- }
-#endif
- return 0;
-}
-
-static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) {
-#ifdef IP_DROP_MEMBERSHIP
- if (addr->sa_family == AF_INET) {
- struct ip_mreq mreq;
-
- mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
- mreq.imr_interface.s_addr= INADDR_ANY;
- if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
- av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
- return -1;
- }
- }
-#endif
-#if CONFIG_IPV6
- if (addr->sa_family == AF_INET6) {
- struct ipv6_mreq mreq6;
-
- memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
- mreq6.ipv6mr_interface= 0;
- if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
- av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
- return -1;
- }
- }
-#endif
- return 0;
-}
-
-#if CONFIG_IPV6
-static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
- struct addrinfo hints, *res = 0;
- int error;
- char sport[16];
- const char *node = 0, *service = "0";
-
- if (port > 0) {
- snprintf(sport, sizeof(sport), "%d", port);
- service = sport;
- }
- if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
- node = hostname;
- }
- memset(&hints, 0, sizeof(hints));
- hints.ai_socktype = type;
- hints.ai_family = family;
- hints.ai_flags = flags;
- if ((error = getaddrinfo(node, service, &hints, &res))) {
- av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
- }
-
- return res;
-}
-
-static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port) {
- struct addrinfo *res0;
- int addr_len;
-
- res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
- if (res0 == 0) return AVERROR(EIO);
- memcpy(addr, res0->ai_addr, res0->ai_addrlen);
- addr_len = res0->ai_addrlen;
- freeaddrinfo(res0);
-
- return addr_len;
-}
-
-static int is_multicast_address(struct sockaddr_storage *addr)