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
23 * @file libavformat/udp.c
27 #define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
31 #include "os_support.h"
33 #include <sys/select.h>
37 #ifndef IPV6_ADD_MEMBERSHIP
38 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
39 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
42 #define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
44 #ifndef IN6_IS_ADDR_MULTICAST
45 #define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
56 struct sockaddr_in dest_addr;
58 struct sockaddr_storage dest_addr;
63 #define UDP_TX_BUF_SIZE 32768
64 #define UDP_MAX_PKT_SIZE 65536
66 static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
67 #ifdef IP_MULTICAST_TTL
68 if (addr->sa_family == AF_INET) {
69 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
70 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
76 if (addr->sa_family == AF_INET6) {
77 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
78 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
86 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr) {
87 #ifdef IP_ADD_MEMBERSHIP
88 if (addr->sa_family == AF_INET) {
91 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
92 mreq.imr_interface.s_addr= INADDR_ANY;
93 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
94 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
100 if (addr->sa_family == AF_INET6) {
101 struct ipv6_mreq mreq6;
103 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
104 mreq6.ipv6mr_interface= 0;
105 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
106 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
114 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) {
115 #ifdef IP_DROP_MEMBERSHIP
116 if (addr->sa_family == AF_INET) {
119 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
120 mreq.imr_interface.s_addr= INADDR_ANY;
121 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
122 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
128 if (addr->sa_family == AF_INET6) {
129 struct ipv6_mreq mreq6;
131 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
132 mreq6.ipv6mr_interface= 0;
133 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
134 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
143 static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
144 struct addrinfo hints, *res = 0;
147 const char *node = 0, *service = "0";
150 snprintf(sport, sizeof(sport), "%d", port);
153 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
156 memset(&hints, 0, sizeof(hints));
157 hints.ai_socktype = type;
158 hints.ai_family = family;
159 hints.ai_flags = flags;
160 if ((error = getaddrinfo(node, service, &hints, &res))) {
161 av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
167 static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port) {
168 struct addrinfo *res0;
171 res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
172 if (res0 == 0) return AVERROR(EIO);
173 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
174 addr_len = res0->ai_addrlen;
180 static int is_multicast_address(struct sockaddr_storage *addr)
182 if (addr->ss_family == AF_INET) {
183 return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
185 if (addr->ss_family == AF_INET6) {
186 return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
192 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, int *addr_len)
195 struct addrinfo *res0 = NULL, *res = NULL;
196 int family = AF_UNSPEC;
198 if (((struct sockaddr *) &s->dest_addr)->sa_family)
199 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
200 res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
203 for (res = res0; res; res=res->ai_next) {
204 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
205 if (udp_fd > 0) break;
206 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
212 memcpy(addr, res->ai_addr, res->ai_addrlen);
213 *addr_len = res->ai_addrlen;
227 static int udp_port(struct sockaddr_storage *addr, int addr_len)
229 char sbuf[sizeof(int)*3+1];
231 if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
232 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
236 return strtol(sbuf, NULL, 10);
241 static int udp_set_url(struct sockaddr_in *addr, const char *hostname, int port)
243 /* set the destination address */
244 if (resolve_host(&addr->sin_addr, hostname) < 0)
246 addr->sin_family = AF_INET;
247 addr->sin_port = htons(port);
249 return sizeof(struct sockaddr_in);
252 static int is_multicast_address(struct sockaddr_in *addr)
254 return IN_MULTICAST(ntohl(addr->sin_addr.s_addr));
257 static int udp_socket_create(UDPContext *s, struct sockaddr_in *addr, int *addr_len)
261 fd = socket(AF_INET, SOCK_DGRAM, 0);
265 addr->sin_family = AF_INET;
266 addr->sin_addr.s_addr = htonl (INADDR_ANY);
267 addr->sin_port = htons(s->local_port);
268 *addr_len = sizeof(struct sockaddr_in);
273 static int udp_port(struct sockaddr_in *addr, int len)
275 return ntohs(addr->sin_port);
277 #endif /* CONFIG_IPV6 */
281 * If no filename is given to av_open_input_file because you want to
282 * get the local port first, then you must call this function to set
283 * the remote server address.
285 * url syntax: udp://host:port[?option=val...]
286 * option: 'ttl=n' : set the ttl value (for multicast only)
287 * 'localport=n' : set the local port
288 * 'pkt_size=n' : set max packet size
289 * 'reuse=1' : enable reusing the socket
291 * @param s1 media file context
292 * @param uri of the remote server
293 * @return zero if no error.
295 int udp_set_remote_url(URLContext *h, const char *uri)
297 UDPContext *s = h->priv_data;
301 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
303 /* set the destination address */
304 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
305 if (s->dest_addr_len < 0) {
308 s->is_multicast = is_multicast_address(&s->dest_addr);
314 * Return the local port used by the UDP connexion
315 * @param s1 media file context
316 * @return the local port number
318 int udp_get_local_port(URLContext *h)
320 UDPContext *s = h->priv_data;
321 return s->local_port;
325 * Return the udp file handle for select() usage to wait for several RTP
326 * streams at the same time.
327 * @param h media file context
329 #if (LIBAVFORMAT_VERSION_MAJOR >= 53)
332 int udp_get_file_handle(URLContext *h)
334 UDPContext *s = h->priv_data;
338 /* put it in UDP context */
339 /* return non zero if error */
340 static int udp_open(URLContext *h, const char *uri, int flags)
343 int port, udp_fd = -1, tmp, bind_ret = -1;
344 UDPContext *s = NULL;
349 struct sockaddr_in my_addr;
351 struct sockaddr_storage my_addr;
356 h->max_packet_size = 1472;
358 is_output = (flags & URL_WRONLY);
360 if(!ff_network_init())
363 s = av_mallocz(sizeof(UDPContext));
365 return AVERROR(ENOMEM);
369 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
371 p = strchr(uri, '?');
373 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
374 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
375 s->ttl = strtol(buf, NULL, 10);
377 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
378 s->local_port = strtol(buf, NULL, 10);
380 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
381 h->max_packet_size = strtol(buf, NULL, 10);
383 if (find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
384 s->buffer_size = strtol(buf, NULL, 10);
388 /* fill the dest addr */
389 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
391 /* XXX: fix url_split */
392 if (hostname[0] == '\0' || hostname[0] == '?') {
393 /* only accepts null hostname if input */
394 if (flags & URL_WRONLY)
397 udp_set_remote_url(h, uri);
400 if (s->is_multicast && !(h->flags & URL_WRONLY))
401 s->local_port = port;
402 udp_fd = udp_socket_create(s, &my_addr, &len);
407 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
410 /* the bind is needed to give a port to the socket now */
411 /* if multicast, try the multicast address bind first */
412 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
413 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
415 /* bind to the local address if not multicast or if the multicast
417 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
420 len = sizeof(my_addr);
421 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
422 s->local_port = udp_port(&my_addr, len);
424 if (s->is_multicast) {
425 if (h->flags & URL_WRONLY) {
427 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
431 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
437 /* limit the tx buf size to limit latency */
438 tmp = s->buffer_size;
439 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
440 av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
444 /* set udp recv buffer size to the largest possible udp packet size to
445 * avoid losing data on OSes that set this too low by default. */
446 tmp = s->buffer_size;
447 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
448 av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno));
450 /* make the socket non-blocking */
451 ff_socket_nonblock(udp_fd, 1);
463 static int udp_read(URLContext *h, uint8_t *buf, int size)
465 UDPContext *s = h->priv_data;
472 if (url_interrupt_cb())
473 return AVERROR(EINTR);
475 FD_SET(s->udp_fd, &rfds);
477 tv.tv_usec = 100 * 1000;
478 ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv);
481 if (!(ret > 0 && FD_ISSET(s->udp_fd, &rfds)))
483 len = recv(s->udp_fd, buf, size, 0);
485 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
486 ff_neterrno() != FF_NETERROR(EINTR))
495 static int udp_write(URLContext *h, uint8_t *buf, int size)
497 UDPContext *s = h->priv_data;
501 ret = sendto (s->udp_fd, buf, size, 0,
502 (struct sockaddr *) &s->dest_addr,
505 if (ff_neterrno() != FF_NETERROR(EINTR) &&
506 ff_neterrno() != FF_NETERROR(EAGAIN))
515 static int udp_close(URLContext *h)
517 UDPContext *s = h->priv_data;
519 if (s->is_multicast && !(h->flags & URL_WRONLY))
520 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
521 closesocket(s->udp_fd);
527 URLProtocol udp_protocol = {
534 .url_get_file_handle = udp_get_file_handle,