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
27 #define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
30 #include "avio_internal.h"
31 #include "libavutil/parseutils.h"
32 #include "libavutil/fifo.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/log.h"
37 #include "libavutil/time.h"
40 #include "os_support.h"
43 #if HAVE_PTHREAD_CANCEL
47 #ifndef HAVE_PTHREAD_CANCEL
48 #define HAVE_PTHREAD_CANCEL 0
51 #ifndef IPV6_ADD_MEMBERSHIP
52 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
53 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
56 #define UDP_TX_BUF_SIZE 32768
57 #define UDP_MAX_PKT_SIZE 65536
68 struct sockaddr_storage dest_addr;
72 /* Circular Buffer variables for use in UDP receive code */
73 int circular_buffer_size;
75 int circular_buffer_error;
76 #if HAVE_PTHREAD_CANCEL
77 pthread_t circular_buffer_thread;
78 pthread_mutex_t mutex;
82 uint8_t tmp[UDP_MAX_PKT_SIZE+4];
87 struct sockaddr_storage local_addr_storage;
90 #define OFFSET(x) offsetof(UDPContext, x)
91 #define D AV_OPT_FLAG_DECODING_PARAM
92 #define E AV_OPT_FLAG_ENCODING_PARAM
93 static const AVOption options[] = {
94 {"buffer_size", "set packet buffer size in bytes", OFFSET(buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
95 {"localport", "set local port to bind to", OFFSET(local_port), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
96 {"localaddr", "choose local IP address", OFFSET(local_addr), AV_OPT_TYPE_STRING, {.str = ""}, 0, 0, D|E },
97 {"pkt_size", "set size of UDP packets", OFFSET(packet_size), AV_OPT_TYPE_INT, {.i64 = 1472}, 0, INT_MAX, D|E },
98 {"reuse", "explicitly allow or disallow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
99 {"ttl", "set the time to live value (for multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, {.i64 = 16}, 0, INT_MAX, E },
100 {"connect", "set if connect() should be called on socket", OFFSET(is_connected), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
101 /* TODO 'sources', 'block' option */
102 {"fifo_size", "set the UDP receiving circular buffer size, expressed as a number of packets with size of 188 bytes", OFFSET(circular_buffer_size), AV_OPT_TYPE_INT, {.i64 = 7*4096}, 0, INT_MAX, D },
103 {"overrun_nonfatal", "survive in case of UDP receiving circular buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D },
104 {"timeout", "set raise error timeout (only in read mode)", OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D },
108 static const AVClass udp_context_class = {
110 .item_name = av_default_item_name,
112 .version = LIBAVUTIL_VERSION_INT,
115 static void log_net_error(void *ctx, int level, const char* prefix)
118 av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
119 av_log(ctx, level, "%s: %s\n", prefix, errbuf);
122 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
123 struct sockaddr *addr)
125 #ifdef IP_MULTICAST_TTL
126 if (addr->sa_family == AF_INET) {
127 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
128 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
133 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
134 if (addr->sa_family == AF_INET6) {
135 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
136 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
144 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
146 #ifdef IP_ADD_MEMBERSHIP
147 if (addr->sa_family == AF_INET) {
150 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
152 mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
154 mreq.imr_interface.s_addr= INADDR_ANY;
155 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
156 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
161 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
162 if (addr->sa_family == AF_INET6) {
163 struct ipv6_mreq mreq6;
165 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
166 mreq6.ipv6mr_interface= 0;
167 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
168 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
176 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
178 #ifdef IP_DROP_MEMBERSHIP
179 if (addr->sa_family == AF_INET) {
182 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
184 mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
186 mreq.imr_interface.s_addr= INADDR_ANY;
187 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
188 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
193 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
194 if (addr->sa_family == AF_INET6) {
195 struct ipv6_mreq mreq6;
197 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
198 mreq6.ipv6mr_interface= 0;
199 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
200 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
208 static struct addrinfo* udp_resolve_host(const char *hostname, int port,
209 int type, int family, int flags)
211 struct addrinfo hints = { 0 }, *res = 0;
214 const char *node = 0, *service = "0";
217 snprintf(sport, sizeof(sport), "%d", port);
220 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
223 hints.ai_socktype = type;
224 hints.ai_family = family;
225 hints.ai_flags = flags;
226 if ((error = getaddrinfo(node, service, &hints, &res))) {
228 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
234 static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr,
235 int addr_len, char **sources,
236 int nb_sources, int include)
238 #if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32)
239 /* These ones are available in the microsoft SDK, but don't seem to work
240 * as on linux, so just prefer the v4-only approach there for now. */
242 for (i = 0; i < nb_sources; i++) {
243 struct group_source_req mreqs;
244 int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
245 struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
246 SOCK_DGRAM, AF_UNSPEC,
249 return AVERROR(ENOENT);
251 mreqs.gsr_interface = 0;
252 memcpy(&mreqs.gsr_group, addr, addr_len);
253 memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen);
254 freeaddrinfo(sourceaddr);
256 if (setsockopt(sockfd, level,
257 include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
258 (const void *)&mreqs, sizeof(mreqs)) < 0) {
260 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
262 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
263 return ff_neterrno();
266 #elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
268 if (addr->sa_family != AF_INET) {
269 av_log(NULL, AV_LOG_ERROR,
270 "Setting multicast sources only supported for IPv4\n");
271 return AVERROR(EINVAL);
273 for (i = 0; i < nb_sources; i++) {
274 struct ip_mreq_source mreqs;
275 struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
276 SOCK_DGRAM, AF_UNSPEC,
279 return AVERROR(ENOENT);
280 if (sourceaddr->ai_addr->sa_family != AF_INET) {
281 freeaddrinfo(sourceaddr);
282 av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n",
284 return AVERROR(EINVAL);
287 mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
288 mreqs.imr_interface.s_addr = INADDR_ANY;
289 mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr;
290 freeaddrinfo(sourceaddr);
292 if (setsockopt(sockfd, IPPROTO_IP,
293 include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
294 (const void *)&mreqs, sizeof(mreqs)) < 0) {
296 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
298 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
299 return ff_neterrno();
303 return AVERROR(ENOSYS);
307 static int udp_set_url(struct sockaddr_storage *addr,
308 const char *hostname, int port)
310 struct addrinfo *res0;
313 res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
314 if (res0 == 0) return AVERROR(EIO);
315 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
316 addr_len = res0->ai_addrlen;
322 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr,
323 socklen_t *addr_len, const char *localaddr)
326 struct addrinfo *res0 = NULL, *res = NULL;
327 int family = AF_UNSPEC;
329 if (((struct sockaddr *) &s->dest_addr)->sa_family)
330 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
331 res0 = udp_resolve_host(localaddr[0] ? localaddr : NULL, s->local_port,
332 SOCK_DGRAM, family, AI_PASSIVE);
335 for (res = res0; res; res=res->ai_next) {
336 udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, 0);
337 if (udp_fd != -1) break;
338 log_net_error(NULL, AV_LOG_ERROR, "socket");
344 memcpy(addr, res->ai_addr, res->ai_addrlen);
345 *addr_len = res->ai_addrlen;
359 static int udp_port(struct sockaddr_storage *addr, int addr_len)
361 char sbuf[sizeof(int)*3+1];
364 if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
365 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
369 return strtol(sbuf, NULL, 10);
374 * If no filename is given to av_open_input_file because you want to
375 * get the local port first, then you must call this function to set
376 * the remote server address.
378 * url syntax: udp://host:port[?option=val...]
379 * option: 'ttl=n' : set the ttl value (for multicast only)
380 * 'localport=n' : set the local port
381 * 'pkt_size=n' : set max packet size
382 * 'reuse=1' : enable reusing the socket
383 * 'overrun_nonfatal=1': survive in case of circular buffer overrun
385 * @param h media file context
386 * @param uri of the remote server
387 * @return zero if no error.
389 int ff_udp_set_remote_url(URLContext *h, const char *uri)
391 UDPContext *s = h->priv_data;
392 char hostname[256], buf[10];
396 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
398 /* set the destination address */
399 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
400 if (s->dest_addr_len < 0) {
403 s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
404 p = strchr(uri, '?');
406 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
407 int was_connected = s->is_connected;
408 s->is_connected = strtol(buf, NULL, 10);
409 if (s->is_connected && !was_connected) {
410 if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
413 log_net_error(h, AV_LOG_ERROR, "connect");
424 * Return the local port used by the UDP connection
425 * @param h media file context
426 * @return the local port number
428 int ff_udp_get_local_port(URLContext *h)
430 UDPContext *s = h->priv_data;
431 return s->local_port;
435 * Return the udp file handle for select() usage to wait for several RTP
436 * streams at the same time.
437 * @param h media file context
439 static int udp_get_file_handle(URLContext *h)
441 UDPContext *s = h->priv_data;
445 #if HAVE_PTHREAD_CANCEL
446 static void *circular_buffer_task( void *_URLContext)
448 URLContext *h = _URLContext;
449 UDPContext *s = h->priv_data;
452 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
453 pthread_mutex_lock(&s->mutex);
454 if (ff_socket_nonblock(s->udp_fd, 0) < 0) {
455 av_log(h, AV_LOG_ERROR, "Failed to set blocking mode");
456 s->circular_buffer_error = AVERROR(EIO);
462 pthread_mutex_unlock(&s->mutex);
463 /* Blocking operations are always cancellation points;
464 see "General Information" / "Thread Cancelation Overview"
466 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
467 len = recv(s->udp_fd, s->tmp+4, sizeof(s->tmp)-4, 0);
468 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
469 pthread_mutex_lock(&s->mutex);
471 if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) {
472 s->circular_buffer_error = ff_neterrno();
477 AV_WL32(s->tmp, len);
479 if(av_fifo_space(s->fifo) < len + 4) {
481 if (s->overrun_nonfatal) {
482 av_log(h, AV_LOG_WARNING, "Circular buffer overrun. "
483 "Surviving due to overrun_nonfatal option\n");
486 av_log(h, AV_LOG_ERROR, "Circular buffer overrun. "
487 "To avoid, increase fifo_size URL option. "
488 "To survive in such case, use overrun_nonfatal option\n");
489 s->circular_buffer_error = AVERROR(EIO);
493 av_fifo_generic_write(s->fifo, s->tmp, len+4, NULL);
494 pthread_cond_signal(&s->cond);
498 pthread_cond_signal(&s->cond);
499 pthread_mutex_unlock(&s->mutex);
504 static int parse_source_list(char *buf, char **sources, int *num_sources,
511 char *next = strchr(source_start, ',');
514 sources[*num_sources] = av_strdup(source_start);
515 if (!sources[*num_sources])
516 return AVERROR(ENOMEM);
517 source_start = next + 1;
519 if (*num_sources >= max_sources || !next)
525 /* put it in UDP context */
526 /* return non zero if error */
527 static int udp_open(URLContext *h, const char *uri, int flags)
529 char hostname[1024], localaddr[1024] = "";
530 int port, udp_fd = -1, tmp, bind_ret = -1;
531 UDPContext *s = h->priv_data;
535 struct sockaddr_storage my_addr;
537 int reuse_specified = 0;
538 int i, num_include_sources = 0, num_exclude_sources = 0;
539 char *include_sources[32], *exclude_sources[32];
543 is_output = !(flags & AVIO_FLAG_READ);
544 if (!s->buffer_size) /* if not set explicitly */
545 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
547 p = strchr(uri, '?');
549 if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
551 s->reuse_socket = strtol(buf, &endptr, 10);
552 /* assume if no digits were found it is a request to enable it */
557 if (av_find_info_tag(buf, sizeof(buf), "overrun_nonfatal", p)) {
559 s->overrun_nonfatal = strtol(buf, &endptr, 10);
560 /* assume if no digits were found it is a request to enable it */
562 s->overrun_nonfatal = 1;
563 if (!HAVE_PTHREAD_CANCEL)
564 av_log(h, AV_LOG_WARNING,
565 "'overrun_nonfatal' option was set but it is not supported "
566 "on this build (pthread support is required)\n");
568 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
569 s->ttl = strtol(buf, NULL, 10);
571 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
572 s->local_port = strtol(buf, NULL, 10);
574 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
575 s->packet_size = strtol(buf, NULL, 10);
577 if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
578 s->buffer_size = strtol(buf, NULL, 10);
580 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
581 s->is_connected = strtol(buf, NULL, 10);
583 if (av_find_info_tag(buf, sizeof(buf), "fifo_size", p)) {
584 s->circular_buffer_size = strtol(buf, NULL, 10);
585 if (!HAVE_PTHREAD_CANCEL)
586 av_log(h, AV_LOG_WARNING,
587 "'circular_buffer_size' option was set but it is not supported "
588 "on this build (pthread support is required)\n");
590 if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
591 av_strlcpy(localaddr, buf, sizeof(localaddr));
593 if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
594 if (parse_source_list(buf, include_sources, &num_include_sources,
595 FF_ARRAY_ELEMS(include_sources)))
598 if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
599 if (parse_source_list(buf, exclude_sources, &num_exclude_sources,
600 FF_ARRAY_ELEMS(exclude_sources)))
603 if (!is_output && av_find_info_tag(buf, sizeof(buf), "timeout", p))
604 s->timeout = strtol(buf, NULL, 10);
606 /* handling needed to support options picking from both AVOption and URL */
607 s->circular_buffer_size *= 188;
608 if (flags & AVIO_FLAG_WRITE) {
609 h->max_packet_size = s->packet_size;
611 h->max_packet_size = UDP_MAX_PKT_SIZE;
613 h->rw_timeout = s->timeout;
615 /* fill the dest addr */
616 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
618 /* XXX: fix av_url_split */
619 if (hostname[0] == '\0' || hostname[0] == '?') {
620 /* only accepts null hostname if input */
621 if (!(flags & AVIO_FLAG_READ))
624 if (ff_udp_set_remote_url(h, uri) < 0)
628 if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ))
629 s->local_port = port;
630 udp_fd = udp_socket_create(s, &my_addr, &len, localaddr[0] ? localaddr : s->local_addr);
634 s->local_addr_storage=my_addr; //store for future multicast join
636 /* Follow the requested reuse option, unless it's multicast in which
637 * case enable reuse unless explicitly disabled.
639 if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
641 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
645 /* If multicast, try binding the multicast address first, to avoid
646 * receiving UDP packets from other sources aimed at the same UDP
647 * port. This fails on windows. This makes sending to the same address
648 * using sendto() fail, so only do it if we're opened in read-only mode. */
649 if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) {
650 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
652 /* bind to the local address if not multicast or if the multicast
654 /* the bind is needed to give a port to the socket now */
655 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
656 log_net_error(h, AV_LOG_ERROR, "bind failed");
660 len = sizeof(my_addr);
661 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
662 s->local_port = udp_port(&my_addr, len);
664 if (s->is_multicast) {
665 if (h->flags & AVIO_FLAG_WRITE) {
667 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
670 if (h->flags & AVIO_FLAG_READ) {
672 if (num_include_sources && num_exclude_sources) {
673 av_log(h, AV_LOG_ERROR, "Simultaneously including and excluding multicast sources is not supported\n");
676 if (num_include_sources) {
677 if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, include_sources, num_include_sources, 1) < 0)
680 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage) < 0)
683 if (num_exclude_sources) {
684 if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, exclude_sources, num_exclude_sources, 0) < 0)
691 /* limit the tx buf size to limit latency */
692 tmp = s->buffer_size;
693 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
694 log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
698 /* set udp recv buffer size to the largest possible udp packet size to
699 * avoid losing data on OSes that set this too low by default. */
700 tmp = s->buffer_size;
701 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
702 log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
705 if (getsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, &len) < 0) {
706 log_net_error(h, AV_LOG_WARNING, "getsockopt(SO_RCVBUF)");
708 av_log(h, AV_LOG_DEBUG, "end receive buffer size reported is %d\n", tmp);
710 /* make the socket non-blocking */
711 ff_socket_nonblock(udp_fd, 1);
713 if (s->is_connected) {
714 if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
715 log_net_error(h, AV_LOG_ERROR, "connect");
720 for (i = 0; i < num_include_sources; i++)
721 av_freep(&include_sources[i]);
722 for (i = 0; i < num_exclude_sources; i++)
723 av_freep(&exclude_sources[i]);
727 #if HAVE_PTHREAD_CANCEL
728 if (!is_output && s->circular_buffer_size) {
731 /* start the task going */
732 s->fifo = av_fifo_alloc(s->circular_buffer_size);
733 ret = pthread_mutex_init(&s->mutex, NULL);
735 av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret));
738 ret = pthread_cond_init(&s->cond, NULL);
740 av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret));
743 ret = pthread_create(&s->circular_buffer_thread, NULL, circular_buffer_task, h);
745 av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret));
748 s->thread_started = 1;
753 #if HAVE_PTHREAD_CANCEL
755 pthread_cond_destroy(&s->cond);
757 pthread_mutex_destroy(&s->mutex);
762 av_fifo_free(s->fifo);
763 for (i = 0; i < num_include_sources; i++)
764 av_freep(&include_sources[i]);
765 for (i = 0; i < num_exclude_sources; i++)
766 av_freep(&exclude_sources[i]);
770 static int udp_read(URLContext *h, uint8_t *buf, int size)
772 UDPContext *s = h->priv_data;
774 int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK;
776 #if HAVE_PTHREAD_CANCEL
778 pthread_mutex_lock(&s->mutex);
780 avail = av_fifo_size(s->fifo);
781 if (avail) { // >=size) {
784 av_fifo_generic_read(s->fifo, tmp, 4, NULL);
787 av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n");
791 av_fifo_generic_read(s->fifo, buf, avail, NULL);
792 av_fifo_drain(s->fifo, AV_RL32(tmp) - avail);
793 pthread_mutex_unlock(&s->mutex);
795 } else if(s->circular_buffer_error){
796 int err = s->circular_buffer_error;
797 pthread_mutex_unlock(&s->mutex);
799 } else if(nonblock) {
800 pthread_mutex_unlock(&s->mutex);
801 return AVERROR(EAGAIN);
804 /* FIXME: using the monotonic clock would be better,
805 but it does not exist on all supported platforms. */
806 int64_t t = av_gettime() + 100000;
807 struct timespec tv = { .tv_sec = t / 1000000,
808 .tv_nsec = (t % 1000000) * 1000 };
809 if (pthread_cond_timedwait(&s->cond, &s->mutex, &tv) < 0) {
810 pthread_mutex_unlock(&s->mutex);
811 return AVERROR(errno == ETIMEDOUT ? EAGAIN : errno);
819 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
820 ret = ff_network_wait_fd(s->udp_fd, 0);
824 ret = recv(s->udp_fd, buf, size, 0);
826 return ret < 0 ? ff_neterrno() : ret;
829 static int udp_write(URLContext *h, const uint8_t *buf, int size)
831 UDPContext *s = h->priv_data;
834 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
835 ret = ff_network_wait_fd(s->udp_fd, 1);
840 if (!s->is_connected) {
841 ret = sendto (s->udp_fd, buf, size, 0,
842 (struct sockaddr *) &s->dest_addr,
845 ret = send(s->udp_fd, buf, size, 0);
847 return ret < 0 ? ff_neterrno() : ret;
850 static int udp_close(URLContext *h)
852 UDPContext *s = h->priv_data;
855 if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
856 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage);
857 closesocket(s->udp_fd);
858 #if HAVE_PTHREAD_CANCEL
859 if (s->thread_started) {
860 pthread_cancel(s->circular_buffer_thread);
861 ret = pthread_join(s->circular_buffer_thread, NULL);
863 av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret));
864 pthread_mutex_destroy(&s->mutex);
865 pthread_cond_destroy(&s->cond);
868 av_fifo_free(s->fifo);
872 URLProtocol ff_udp_protocol = {
874 .url_open = udp_open,
875 .url_read = udp_read,
876 .url_write = udp_write,
877 .url_close = udp_close,
878 .url_get_file_handle = udp_get_file_handle,
879 .priv_data_size = sizeof(UDPContext),
880 .priv_data_class = &udp_context_class,
881 .flags = URL_PROTOCOL_FLAG_NETWORK,