2 * UDP prototype streaming system
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #ifndef IPV6_ADD_MEMBERSHIP
26 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
27 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
38 struct sockaddr_in dest_addr;
40 struct sockaddr_storage dest_addr;
45 #define UDP_TX_BUF_SIZE 32768
46 #define UDP_MAX_PKT_SIZE 65536
50 static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
51 if (addr->sa_family == AF_INET) {
52 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
53 perror("setsockopt(IP_MULTICAST_TTL)");
57 if (addr->sa_family == AF_INET6) {
58 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
59 perror("setsockopt(IPV6_MULTICAST_HOPS)");
66 static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
68 struct ipv6_mreq mreq6;
69 if (addr->sa_family == AF_INET) {
70 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
71 mreq.imr_interface.s_addr= INADDR_ANY;
72 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
73 perror("setsockopt(IP_ADD_MEMBERSHIP)");
77 if (addr->sa_family == AF_INET6) {
78 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
79 mreq6.ipv6mr_interface= 0;
80 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
81 perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
88 static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
90 struct ipv6_mreq mreq6;
91 if (addr->sa_family == AF_INET) {
92 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
93 mreq.imr_interface.s_addr= INADDR_ANY;
94 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
95 perror("setsockopt(IP_DROP_MEMBERSHIP)");
99 if (addr->sa_family == AF_INET6) {
100 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
101 mreq6.ipv6mr_interface= 0;
102 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
103 perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
110 static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
111 struct addrinfo hints, *res = 0;
114 const char *node = 0, *service = 0;
117 snprintf(sport, sizeof(sport), "%d", port);
120 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
123 if ((node) || (service)) {
124 memset(&hints, 0, sizeof(hints));
125 hints.ai_socktype = type;
126 hints.ai_family = family;
127 hints.ai_flags = flags;
128 if ((error = getaddrinfo(node, service, &hints, &res))) {
129 av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
135 static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
136 UDPContext *s = h->priv_data;
139 struct addrinfo *res0;
140 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
141 res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
142 if (res0 == 0) return AVERROR(EIO);
143 memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
144 s->dest_addr_len = res0->ai_addrlen;
149 static int udp_ipv6_set_local(URLContext *h) {
150 UDPContext *s = h->priv_data;
152 struct sockaddr_storage clientaddr;
154 char sbuf[NI_MAXSERV];
155 char hbuf[NI_MAXHOST];
156 struct addrinfo *res0 = NULL, *res = NULL;
158 if (s->local_port != 0) {
159 res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
162 for (res = res0; res; res=res->ai_next) {
163 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
164 if (udp_fd > 0) break;
168 udp_fd = socket(s->dest_addr.ss_family, SOCK_DGRAM, 0);
176 if (s->local_port != 0) {
177 if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
185 addrlen = sizeof(clientaddr);
186 if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
187 perror("getsockname");
191 if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
192 perror("getnameinfo");
196 s->local_port = strtol(sbuf, NULL, 10);
208 #endif /* CONFIG_IPV6 */
212 * If no filename is given to av_open_input_file because you want to
213 * get the local port first, then you must call this function to set
214 * the remote server address.
216 * url syntax: udp://host:port[?option=val...]
217 * option: 'multicast=1' : enable multicast
218 * 'ttl=n' : set the ttl value (for multicast only)
219 * 'localport=n' : set the local port
220 * 'pkt_size=n' : set max packet size
221 * 'reuse=1' : enable reusing the socket
223 * @param s1 media file context
224 * @param uri of the remote server
225 * @return zero if no error.
227 int udp_set_remote_url(URLContext *h, const char *uri)
230 return udp_ipv6_set_remote_url(h, uri);
232 UDPContext *s = h->priv_data;
236 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
238 /* set the destination address */
239 if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
241 s->dest_addr.sin_family = AF_INET;
242 s->dest_addr.sin_port = htons(port);
248 * Return the local port used by the UDP connexion
249 * @param s1 media file context
250 * @return the local port number
252 int udp_get_local_port(URLContext *h)
254 UDPContext *s = h->priv_data;
255 return s->local_port;
259 * Return the udp file handle for select() usage to wait for several RTP
260 * streams at the same time.
261 * @param h media file context
263 int udp_get_file_handle(URLContext *h)
265 UDPContext *s = h->priv_data;
269 /* put it in UDP context */
270 /* return non zero if error */
271 static int udp_open(URLContext *h, const char *uri, int flags)
274 int port, udp_fd = -1, tmp;
275 UDPContext *s = NULL;
280 struct sockaddr_in my_addr, my_addr1;
285 h->max_packet_size = 1472;
287 is_output = (flags & URL_WRONLY);
289 s = av_malloc(sizeof(UDPContext));
291 return AVERROR(ENOMEM);
298 p = strchr(uri, '?');
300 s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
301 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
302 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
303 s->ttl = strtol(buf, NULL, 10);
305 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
306 s->local_port = strtol(buf, NULL, 10);
308 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
309 h->max_packet_size = strtol(buf, NULL, 10);
313 /* fill the dest addr */
314 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
316 /* XXX: fix url_split */
317 if (hostname[0] == '\0' || hostname[0] == '?') {
318 /* only accepts null hostname if input */
319 if (s->is_multicast || (flags & URL_WRONLY))
322 udp_set_remote_url(h, uri);
325 if(!ff_network_init())
329 udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
333 my_addr.sin_family = AF_INET;
334 my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
335 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
336 /* special case: the bind must be done on the multicast address port */
337 my_addr.sin_port = s->dest_addr.sin_port;
339 my_addr.sin_port = htons(s->local_port);
343 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
346 /* the bind is needed to give a port to the socket now */
347 if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
350 len = sizeof(my_addr1);
351 getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
352 s->local_port = ntohs(my_addr1.sin_port);
354 #ifdef IP_MULTICAST_TTL
355 if (s->is_multicast) {
356 if (h->flags & URL_WRONLY) {
358 if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
359 &s->ttl, sizeof(s->ttl)) < 0) {
360 perror("IP_MULTICAST_TTL");
365 memset(&s->mreq, 0, sizeof(s->mreq));
366 s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
367 s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
368 if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
369 &s->mreq, sizeof(s->mreq)) < 0) {
370 perror("rtp: IP_ADD_MEMBERSHIP");
377 if (s->is_multicast && !(h->flags & URL_WRONLY))
378 s->local_port = port;
379 udp_fd = udp_ipv6_set_local(h);
382 if (s->is_multicast) {
383 if (h->flags & URL_WRONLY) {
384 if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
387 if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
391 #endif /* CONFIG_IPV6 */
394 /* limit the tx buf size to limit latency */
395 tmp = UDP_TX_BUF_SIZE;
396 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
397 perror("setsockopt sndbuf");
401 /* set udp recv buffer size to the largest possible udp packet size to
402 * avoid losing data on OSes that set this too low by default. */
403 tmp = UDP_MAX_PKT_SIZE;
404 setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
416 static int udp_read(URLContext *h, uint8_t *buf, int size)
418 UDPContext *s = h->priv_data;
420 struct sockaddr_in from;
422 struct sockaddr_storage from;
428 from_len = sizeof(from);
429 len = recvfrom (s->udp_fd, buf, size, 0,
430 (struct sockaddr *)&from, &from_len);
432 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
433 ff_neterrno() != FF_NETERROR(EINTR))
442 static int udp_write(URLContext *h, uint8_t *buf, int size)
444 UDPContext *s = h->priv_data;
448 ret = sendto (s->udp_fd, buf, size, 0,
449 (struct sockaddr *) &s->dest_addr,
451 sizeof (s->dest_addr));
456 if (ff_neterrno() != FF_NETERROR(EINTR) &&
457 ff_neterrno() != FF_NETERROR(EAGAIN))
466 static int udp_close(URLContext *h)
468 UDPContext *s = h->priv_data;
471 #ifdef IP_DROP_MEMBERSHIP
472 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
473 if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
474 &s->mreq, sizeof(s->mreq)) < 0) {
475 perror("IP_DROP_MEMBERSHIP");
480 if (s->is_multicast && !(h->flags & URL_WRONLY))
481 udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
483 closesocket(s->udp_fd);
489 URLProtocol udp_protocol = {