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* UDP prototype streaming system
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef IPV6_ADD_MEMBERSHIP
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#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
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#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
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struct sockaddr_in dest_addr;
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struct sockaddr_storage dest_addr;
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#define UDP_TX_BUF_SIZE 32768
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#define UDP_MAX_PKT_SIZE 65536
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static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
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if (addr->sa_family == AF_INET) {
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if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
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perror("setsockopt(IP_MULTICAST_TTL)");
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if (addr->sa_family == AF_INET6) {
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if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
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perror("setsockopt(IPV6_MULTICAST_HOPS)");
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static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
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struct ipv6_mreq mreq6;
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if (addr->sa_family == AF_INET) {
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mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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mreq.imr_interface.s_addr= INADDR_ANY;
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if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
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perror("setsockopt(IP_ADD_MEMBERSHIP)");
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if (addr->sa_family == AF_INET6) {
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memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
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mreq6.ipv6mr_interface= 0;
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if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
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perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
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static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
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struct ipv6_mreq mreq6;
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if (addr->sa_family == AF_INET) {
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mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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mreq.imr_interface.s_addr= INADDR_ANY;
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if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
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perror("setsockopt(IP_DROP_MEMBERSHIP)");
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if (addr->sa_family == AF_INET6) {
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memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
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mreq6.ipv6mr_interface= 0;
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if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
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perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
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static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
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struct addrinfo hints, *res = 0;
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const char *node = 0, *service = 0;
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snprintf(sport, sizeof(sport), "%d", port);
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if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
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if ((node) || (service)) {
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memset(&hints, 0, sizeof(hints));
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hints.ai_socktype = type;
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hints.ai_family = family;
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hints.ai_flags = flags;
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if ((error = getaddrinfo(node, service, &hints, &res))) {
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av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
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static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
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UDPContext *s = h->priv_data;
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struct addrinfo *res0;
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url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
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res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
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if (res0 == 0) return AVERROR(EIO);
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memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
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s->dest_addr_len = res0->ai_addrlen;
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static int udp_ipv6_set_local(URLContext *h) {
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UDPContext *s = h->priv_data;
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struct sockaddr_storage clientaddr;
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char sbuf[NI_MAXSERV];
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char hbuf[NI_MAXHOST];
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struct addrinfo *res0 = NULL, *res = NULL;
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if (s->local_port != 0) {
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res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
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for (res = res0; res; res=res->ai_next) {
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udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
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if (udp_fd > 0) break;
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udp_fd = socket(s->dest_addr.ss_family, SOCK_DGRAM, 0);
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if (s->local_port != 0) {
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if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
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addrlen = sizeof(clientaddr);
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if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
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perror("getsockname");
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if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
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perror("getnameinfo");
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s->local_port = strtol(sbuf, NULL, 10);
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#endif /* CONFIG_IPV6 */
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* If no filename is given to av_open_input_file because you want to
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* get the local port first, then you must call this function to set
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* the remote server address.
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* url syntax: udp://host:port[?option=val...]
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* option: 'multicast=1' : enable multicast
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* 'ttl=n' : set the ttl value (for multicast only)
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* 'localport=n' : set the local port
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* 'pkt_size=n' : set max packet size
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* 'reuse=1' : enable reusing the socket
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* @param s1 media file context
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* @param uri of the remote server
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* @return zero if no error.
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int udp_set_remote_url(URLContext *h, const char *uri)
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return udp_ipv6_set_remote_url(h, uri);
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UDPContext *s = h->priv_data;
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url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
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/* set the destination address */
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if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
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s->dest_addr.sin_family = AF_INET;
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s->dest_addr.sin_port = htons(port);
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* Return the local port used by the UDP connexion
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* @param s1 media file context
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* @return the local port number
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int udp_get_local_port(URLContext *h)
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UDPContext *s = h->priv_data;
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return s->local_port;
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* Return the udp file handle for select() usage to wait for several RTP
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* streams at the same time.
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* @param h media file context
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int udp_get_file_handle(URLContext *h)
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UDPContext *s = h->priv_data;
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/* put it in UDP context */
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/* return non zero if error */
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static int udp_open(URLContext *h, const char *uri, int flags)
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int port, udp_fd = -1, tmp;
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UDPContext *s = NULL;
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struct sockaddr_in my_addr, my_addr1;
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h->max_packet_size = 1472;
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is_output = (flags & URL_WRONLY);
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s = av_malloc(sizeof(UDPContext));
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return AVERROR(ENOMEM);
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p = strchr(uri, '?');
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s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
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s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
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if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
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s->ttl = strtol(buf, NULL, 10);
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if (find_info_tag(buf, sizeof(buf), "localport", p)) {
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s->local_port = strtol(buf, NULL, 10);
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if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
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h->max_packet_size = strtol(buf, NULL, 10);
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/* fill the dest addr */
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url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
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/* XXX: fix url_split */
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if (hostname[0] == '\0' || hostname[0] == '?') {
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/* only accepts null hostname if input */
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if (s->is_multicast || (flags & URL_WRONLY))
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udp_set_remote_url(h, uri);
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if(!ff_network_init())
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udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
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my_addr.sin_family = AF_INET;
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my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
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if (s->is_multicast && !(h->flags & URL_WRONLY)) {
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/* special case: the bind must be done on the multicast address port */
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my_addr.sin_port = s->dest_addr.sin_port;
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my_addr.sin_port = htons(s->local_port);
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if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
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/* the bind is needed to give a port to the socket now */
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if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
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len = sizeof(my_addr1);
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getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
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s->local_port = ntohs(my_addr1.sin_port);
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#ifdef IP_MULTICAST_TTL
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if (s->is_multicast) {
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if (h->flags & URL_WRONLY) {
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if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
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&s->ttl, sizeof(s->ttl)) < 0) {
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perror("IP_MULTICAST_TTL");
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memset(&s->mreq, 0, sizeof(s->mreq));
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s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
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s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
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if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
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&s->mreq, sizeof(s->mreq)) < 0) {
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perror("rtp: IP_ADD_MEMBERSHIP");
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if (s->is_multicast && !(h->flags & URL_WRONLY))
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s->local_port = port;
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udp_fd = udp_ipv6_set_local(h);
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if (s->is_multicast) {
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if (h->flags & URL_WRONLY) {
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if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
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if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
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#endif /* CONFIG_IPV6 */
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/* limit the tx buf size to limit latency */
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tmp = UDP_TX_BUF_SIZE;
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if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
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perror("setsockopt sndbuf");
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/* set udp recv buffer size to the largest possible udp packet size to
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* avoid losing data on OSes that set this too low by default. */
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tmp = UDP_MAX_PKT_SIZE;
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setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
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static int udp_read(URLContext *h, uint8_t *buf, int size)
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UDPContext *s = h->priv_data;
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struct sockaddr_in from;
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struct sockaddr_storage from;
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from_len = sizeof(from);
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len = recvfrom (s->udp_fd, buf, size, 0,
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(struct sockaddr *)&from, &from_len);
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if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
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ff_neterrno() != FF_NETERROR(EINTR))
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static int udp_write(URLContext *h, uint8_t *buf, int size)
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UDPContext *s = h->priv_data;
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ret = sendto (s->udp_fd, buf, size, 0,
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(struct sockaddr *) &s->dest_addr,
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sizeof (s->dest_addr));
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if (ff_neterrno() != FF_NETERROR(EINTR) &&
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ff_neterrno() != FF_NETERROR(EAGAIN))
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static int udp_close(URLContext *h)
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UDPContext *s = h->priv_data;
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#ifdef IP_DROP_MEMBERSHIP
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if (s->is_multicast && !(h->flags & URL_WRONLY)) {
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if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
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&s->mreq, sizeof(s->mreq)) < 0) {
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perror("IP_DROP_MEMBERSHIP");
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if (s->is_multicast && !(h->flags & URL_WRONLY))
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udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
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closesocket(s->udp_fd);
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URLProtocol udp_protocol = {