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
69 struct sockaddr_storage dest_addr;
73 /* Circular Buffer variables for use in UDP receive code */
74 int circular_buffer_size;
76 int circular_buffer_error;
77 #if HAVE_PTHREAD_CANCEL
78 pthread_t circular_buffer_thread;
79 pthread_mutex_t mutex;
83 uint8_t tmp[UDP_MAX_PKT_SIZE+4];
88 struct sockaddr_storage local_addr_storage;
91 #define OFFSET(x) offsetof(UDPContext, x)
92 #define D AV_OPT_FLAG_DECODING_PARAM
93 #define E AV_OPT_FLAG_ENCODING_PARAM
94 static const AVOption options[] = {
95 {"buffer_size", "set packet buffer size in bytes", OFFSET(buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
96 {"localport", "set local port to bind to", OFFSET(local_port), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
97 {"localaddr", "choose local IP address", OFFSET(local_addr), AV_OPT_TYPE_STRING, {.str = ""}, 0, 0, D|E },
98 {"pkt_size", "set size of UDP packets", OFFSET(packet_size), AV_OPT_TYPE_INT, {.i64 = 1472}, 0, INT_MAX, D|E },
99 {"reuse", "explicitly allow or disallow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
100 {"broadcast", "explicitly allow or disallow broadcast destination", OFFSET(is_broadcast), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
101 {"ttl", "set the time to live value (for multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, {.i64 = 16}, 0, INT_MAX, E },
102 {"connect", "set if connect() should be called on socket", OFFSET(is_connected), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
103 /* TODO 'sources', 'block' option */
104 {"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 },
105 {"overrun_nonfatal", "survive in case of UDP receiving circular buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D },
106 {"timeout", "set raise error timeout (only in read mode)", OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D },
110 static const AVClass udp_context_class = {
112 .item_name = av_default_item_name,
114 .version = LIBAVUTIL_VERSION_INT,
117 static void log_net_error(void *ctx, int level, const char* prefix)
120 av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
121 av_log(ctx, level, "%s: %s\n", prefix, errbuf);
124 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
125 struct sockaddr *addr)
127 #ifdef IP_MULTICAST_TTL
128 if (addr->sa_family == AF_INET) {
129 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
130 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
135 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
136 if (addr->sa_family == AF_INET6) {
137 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
138 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
146 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
148 #ifdef IP_ADD_MEMBERSHIP
149 if (addr->sa_family == AF_INET) {
152 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
154 mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
156 mreq.imr_interface.s_addr= INADDR_ANY;
157 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
158 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
163 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
164 if (addr->sa_family == AF_INET6) {
165 struct ipv6_mreq mreq6;
167 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
168 mreq6.ipv6mr_interface= 0;
169 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
170 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
178 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
180 #ifdef IP_DROP_MEMBERSHIP
181 if (addr->sa_family == AF_INET) {
184 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
186 mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
188 mreq.imr_interface.s_addr= INADDR_ANY;
189 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
190 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
195 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
196 if (addr->sa_family == AF_INET6) {
197 struct ipv6_mreq mreq6;
199 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
200 mreq6.ipv6mr_interface= 0;
201 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
202 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
210 static struct addrinfo* udp_resolve_host(const char *hostname, int port,
211 int type, int family, int flags)
213 struct addrinfo hints = { 0 }, *res = 0;
216 const char *node = 0, *service = "0";
219 snprintf(sport, sizeof(sport), "%d", port);
222 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
225 hints.ai_socktype = type;
226 hints.ai_family = family;
227 hints.ai_flags = flags;
228 if ((error = getaddrinfo(node, service, &hints, &res))) {
230 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
236 static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr,
237 int addr_len, char **sources,
238 int nb_sources, int include)
240 #if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32)
241 /* These ones are available in the microsoft SDK, but don't seem to work
242 * as on linux, so just prefer the v4-only approach there for now. */
244 for (i = 0; i < nb_sources; i++) {
245 struct group_source_req mreqs;
246 int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
247 struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
248 SOCK_DGRAM, AF_UNSPEC,
251 return AVERROR(ENOENT);
253 mreqs.gsr_interface = 0;
254 memcpy(&mreqs.gsr_group, addr, addr_len);
255 memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen);
256 freeaddrinfo(sourceaddr);
258 if (setsockopt(sockfd, level,
259 include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
260 (const void *)&mreqs, sizeof(mreqs)) < 0) {
262 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
264 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
265 return ff_neterrno();
268 #elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
270 if (addr->sa_family != AF_INET) {
271 av_log(NULL, AV_LOG_ERROR,
272 "Setting multicast sources only supported for IPv4\n");
273 return AVERROR(EINVAL);
275 for (i = 0; i < nb_sources; i++) {
276 struct ip_mreq_source mreqs;
277 struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
278 SOCK_DGRAM, AF_UNSPEC,
281 return AVERROR(ENOENT);
282 if (sourceaddr->ai_addr->sa_family != AF_INET) {
283 freeaddrinfo(sourceaddr);
284 av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n",
286 return AVERROR(EINVAL);
289 mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
290 mreqs.imr_interface.s_addr = INADDR_ANY;
291 mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr;
292 freeaddrinfo(sourceaddr);
294 if (setsockopt(sockfd, IPPROTO_IP,
295 include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
296 (const void *)&mreqs, sizeof(mreqs)) < 0) {
298 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
300 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
301 return ff_neterrno();
305 return AVERROR(ENOSYS);
309 static int udp_set_url(struct sockaddr_storage *addr,
310 const char *hostname, int port)
312 struct addrinfo *res0;
315 res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
316 if (res0 == 0) return AVERROR(EIO);
317 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
318 addr_len = res0->ai_addrlen;
324 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr,
325 socklen_t *addr_len, const char *localaddr)
328 struct addrinfo *res0 = NULL, *res = NULL;
329 int family = AF_UNSPEC;
331 if (((struct sockaddr *) &s->dest_addr)->sa_family)
332 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
333 res0 = udp_resolve_host(localaddr[0] ? localaddr : NULL, s->local_port,
334 SOCK_DGRAM, family, AI_PASSIVE);
337 for (res = res0; res; res=res->ai_next) {
338 udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, 0);
339 if (udp_fd != -1) break;
340 log_net_error(NULL, AV_LOG_ERROR, "socket");
346 memcpy(addr, res->ai_addr, res->ai_addrlen);
347 *addr_len = res->ai_addrlen;
361 static int udp_port(struct sockaddr_storage *addr, int addr_len)
363 char sbuf[sizeof(int)*3+1];
366 if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
367 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
371 return strtol(sbuf, NULL, 10);
376 * If no filename is given to av_open_input_file because you want to
377 * get the local port first, then you must call this function to set
378 * the remote server address.
380 * url syntax: udp://host:port[?option=val...]
381 * option: 'ttl=n' : set the ttl value (for multicast only)
382 * 'localport=n' : set the local port
383 * 'pkt_size=n' : set max packet size
384 * 'reuse=1' : enable reusing the socket
385 * 'overrun_nonfatal=1': survive in case of circular buffer overrun
387 * @param h media file context
388 * @param uri of the remote server
389 * @return zero if no error.
391 int ff_udp_set_remote_url(URLContext *h, const char *uri)
393 UDPContext *s = h->priv_data;
394 char hostname[256], buf[10];
398 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
400 /* set the destination address */
401 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
402 if (s->dest_addr_len < 0) {
405 s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
406 p = strchr(uri, '?');
408 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
409 int was_connected = s->is_connected;
410 s->is_connected = strtol(buf, NULL, 10);
411 if (s->is_connected && !was_connected) {
412 if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
415 log_net_error(h, AV_LOG_ERROR, "connect");
426 * Return the local port used by the UDP connection
427 * @param h media file context
428 * @return the local port number
430 int ff_udp_get_local_port(URLContext *h)
432 UDPContext *s = h->priv_data;
433 return s->local_port;
437 * Return the udp file handle for select() usage to wait for several RTP
438 * streams at the same time.
439 * @param h media file context
441 static int udp_get_file_handle(URLContext *h)
443 UDPContext *s = h->priv_data;
447 #if HAVE_PTHREAD_CANCEL
448 static void *circular_buffer_task( void *_URLContext)
450 URLContext *h = _URLContext;
451 UDPContext *s = h->priv_data;
454 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
455 pthread_mutex_lock(&s->mutex);
456 if (ff_socket_nonblock(s->udp_fd, 0) < 0) {
457 av_log(h, AV_LOG_ERROR, "Failed to set blocking mode");
458 s->circular_buffer_error = AVERROR(EIO);
464 pthread_mutex_unlock(&s->mutex);
465 /* Blocking operations are always cancellation points;
466 see "General Information" / "Thread Cancelation Overview"
468 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
469 len = recv(s->udp_fd, s->tmp+4, sizeof(s->tmp)-4, 0);
470 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
471 pthread_mutex_lock(&s->mutex);
473 if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) {
474 s->circular_buffer_error = ff_neterrno();
479 AV_WL32(s->tmp, len);
481 if(av_fifo_space(s->fifo) < len + 4) {
483 if (s->overrun_nonfatal) {
484 av_log(h, AV_LOG_WARNING, "Circular buffer overrun. "
485 "Surviving due to overrun_nonfatal option\n");
488 av_log(h, AV_LOG_ERROR, "Circular buffer overrun. "
489 "To avoid, increase fifo_size URL option. "
490 "To survive in such case, use overrun_nonfatal option\n");
491 s->circular_buffer_error = AVERROR(EIO);
495 av_fifo_generic_write(s->fifo, s->tmp, len+4, NULL);
496 pthread_cond_signal(&s->cond);
500 pthread_cond_signal(&s->cond);
501 pthread_mutex_unlock(&s->mutex);
506 static int parse_source_list(char *buf, char **sources, int *num_sources,
513 char *next = strchr(source_start, ',');
516 sources[*num_sources] = av_strdup(source_start);
517 if (!sources[*num_sources])
518 return AVERROR(ENOMEM);
519 source_start = next + 1;
521 if (*num_sources >= max_sources || !next)
527 /* put it in UDP context */
528 /* return non zero if error */
529 static int udp_open(URLContext *h, const char *uri, int flags)
531 char hostname[1024], localaddr[1024] = "";
532 int port, udp_fd = -1, tmp, bind_ret = -1;
533 UDPContext *s = h->priv_data;
537 struct sockaddr_storage my_addr;
539 int reuse_specified = 0;
540 int i, num_include_sources = 0, num_exclude_sources = 0;
541 char *include_sources[32], *exclude_sources[32];
545 is_output = !(flags & AVIO_FLAG_READ);
546 if (!s->buffer_size) /* if not set explicitly */
547 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
549 p = strchr(uri, '?');
551 if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
553 s->reuse_socket = strtol(buf, &endptr, 10);
554 /* assume if no digits were found it is a request to enable it */
559 if (av_find_info_tag(buf, sizeof(buf), "overrun_nonfatal", p)) {
561 s->overrun_nonfatal = strtol(buf, &endptr, 10);
562 /* assume if no digits were found it is a request to enable it */
564 s->overrun_nonfatal = 1;
565 if (!HAVE_PTHREAD_CANCEL)
566 av_log(h, AV_LOG_WARNING,
567 "'overrun_nonfatal' option was set but it is not supported "
568 "on this build (pthread support is required)\n");
570 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
571 s->ttl = strtol(buf, NULL, 10);
573 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
574 s->local_port = strtol(buf, NULL, 10);
576 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
577 s->packet_size = strtol(buf, NULL, 10);
579 if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
580 s->buffer_size = strtol(buf, NULL, 10);
582 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
583 s->is_connected = strtol(buf, NULL, 10);
585 if (av_find_info_tag(buf, sizeof(buf), "fifo_size", p)) {
586 s->circular_buffer_size = strtol(buf, NULL, 10);
587 if (!HAVE_PTHREAD_CANCEL)
588 av_log(h, AV_LOG_WARNING,
589 "'circular_buffer_size' option was set but it is not supported "
590 "on this build (pthread support is required)\n");
592 if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
593 av_strlcpy(localaddr, buf, sizeof(localaddr));
595 if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
596 if (parse_source_list(buf, include_sources, &num_include_sources,
597 FF_ARRAY_ELEMS(include_sources)))
600 if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
601 if (parse_source_list(buf, exclude_sources, &num_exclude_sources,
602 FF_ARRAY_ELEMS(exclude_sources)))
605 if (!is_output && av_find_info_tag(buf, sizeof(buf), "timeout", p))
606 s->timeout = strtol(buf, NULL, 10);
607 if (is_output && av_find_info_tag(buf, sizeof(buf), "broadcast", p))
608 s->is_broadcast = strtol(buf, NULL, 10);
610 /* handling needed to support options picking from both AVOption and URL */
611 s->circular_buffer_size *= 188;
612 if (flags & AVIO_FLAG_WRITE) {
613 h->max_packet_size = s->packet_size;
615 h->max_packet_size = UDP_MAX_PKT_SIZE;
617 h->rw_timeout = s->timeout;
619 /* fill the dest addr */
620 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
622 /* XXX: fix av_url_split */
623 if (hostname[0] == '\0' || hostname[0] == '?') {
624 /* only accepts null hostname if input */
625 if (!(flags & AVIO_FLAG_READ))
628 if (ff_udp_set_remote_url(h, uri) < 0)
632 if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ))
633 s->local_port = port;
634 udp_fd = udp_socket_create(s, &my_addr, &len, localaddr[0] ? localaddr : s->local_addr);
638 s->local_addr_storage=my_addr; //store for future multicast join
640 /* Follow the requested reuse option, unless it's multicast in which
641 * case enable reuse unless explicitly disabled.
643 if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
645 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
649 if (s->is_broadcast) {
650 if (setsockopt (udp_fd, SOL_SOCKET, SO_BROADCAST, &(s->is_broadcast), sizeof(s->is_broadcast)) != 0)
654 /* If multicast, try binding the multicast address first, to avoid
655 * receiving UDP packets from other sources aimed at the same UDP
656 * port. This fails on windows. This makes sending to the same address
657 * using sendto() fail, so only do it if we're opened in read-only mode. */
658 if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) {
659 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
661 /* bind to the local address if not multicast or if the multicast
663 /* the bind is needed to give a port to the socket now */
664 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
665 log_net_error(h, AV_LOG_ERROR, "bind failed");
669 len = sizeof(my_addr);
670 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
671 s->local_port = udp_port(&my_addr, len);
673 if (s->is_multicast) {
674 if (h->flags & AVIO_FLAG_WRITE) {
676 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
679 if (h->flags & AVIO_FLAG_READ) {
681 if (num_include_sources && num_exclude_sources) {
682 av_log(h, AV_LOG_ERROR, "Simultaneously including and excluding multicast sources is not supported\n");
685 if (num_include_sources) {
686 if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, include_sources, num_include_sources, 1) < 0)
689 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage) < 0)
692 if (num_exclude_sources) {
693 if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, exclude_sources, num_exclude_sources, 0) < 0)
700 /* limit the tx buf size to limit latency */
701 tmp = s->buffer_size;
702 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
703 log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
707 /* set udp recv buffer size to the requested value (default 64K) */
708 tmp = s->buffer_size;
709 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
710 log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
713 if (getsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, &len) < 0) {
714 log_net_error(h, AV_LOG_WARNING, "getsockopt(SO_RCVBUF)");
716 av_log(h, AV_LOG_DEBUG, "end receive buffer size reported is %d\n", tmp);
717 if(tmp < s->buffer_size)
718 av_log(h, AV_LOG_WARNING, "attempted to set receive buffer to size %d but it only ended up set as %d", s->buffer_size, tmp);
721 /* make the socket non-blocking */
722 ff_socket_nonblock(udp_fd, 1);
724 if (s->is_connected) {
725 if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
726 log_net_error(h, AV_LOG_ERROR, "connect");
731 for (i = 0; i < num_include_sources; i++)
732 av_freep(&include_sources[i]);
733 for (i = 0; i < num_exclude_sources; i++)
734 av_freep(&exclude_sources[i]);
738 #if HAVE_PTHREAD_CANCEL
739 if (!is_output && s->circular_buffer_size) {
742 /* start the task going */
743 s->fifo = av_fifo_alloc(s->circular_buffer_size);
744 ret = pthread_mutex_init(&s->mutex, NULL);
746 av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret));
749 ret = pthread_cond_init(&s->cond, NULL);
751 av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret));
754 ret = pthread_create(&s->circular_buffer_thread, NULL, circular_buffer_task, h);
756 av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret));
759 s->thread_started = 1;
764 #if HAVE_PTHREAD_CANCEL
766 pthread_cond_destroy(&s->cond);
768 pthread_mutex_destroy(&s->mutex);
773 av_fifo_freep(&s->fifo);
774 for (i = 0; i < num_include_sources; i++)
775 av_freep(&include_sources[i]);
776 for (i = 0; i < num_exclude_sources; i++)
777 av_freep(&exclude_sources[i]);
781 static int udp_read(URLContext *h, uint8_t *buf, int size)
783 UDPContext *s = h->priv_data;
785 int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK;
787 #if HAVE_PTHREAD_CANCEL
789 pthread_mutex_lock(&s->mutex);
791 avail = av_fifo_size(s->fifo);
792 if (avail) { // >=size) {
795 av_fifo_generic_read(s->fifo, tmp, 4, NULL);
798 av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n");
802 av_fifo_generic_read(s->fifo, buf, avail, NULL);
803 av_fifo_drain(s->fifo, AV_RL32(tmp) - avail);
804 pthread_mutex_unlock(&s->mutex);
806 } else if(s->circular_buffer_error){
807 int err = s->circular_buffer_error;
808 pthread_mutex_unlock(&s->mutex);
810 } else if(nonblock) {
811 pthread_mutex_unlock(&s->mutex);
812 return AVERROR(EAGAIN);
815 /* FIXME: using the monotonic clock would be better,
816 but it does not exist on all supported platforms. */
817 int64_t t = av_gettime() + 100000;
818 struct timespec tv = { .tv_sec = t / 1000000,
819 .tv_nsec = (t % 1000000) * 1000 };
820 if (pthread_cond_timedwait(&s->cond, &s->mutex, &tv) < 0) {
821 pthread_mutex_unlock(&s->mutex);
822 return AVERROR(errno == ETIMEDOUT ? EAGAIN : errno);
830 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
831 ret = ff_network_wait_fd(s->udp_fd, 0);
835 ret = recv(s->udp_fd, buf, size, 0);
837 return ret < 0 ? ff_neterrno() : ret;
840 static int udp_write(URLContext *h, const uint8_t *buf, int size)
842 UDPContext *s = h->priv_data;
845 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
846 ret = ff_network_wait_fd(s->udp_fd, 1);
851 if (!s->is_connected) {
852 ret = sendto (s->udp_fd, buf, size, 0,
853 (struct sockaddr *) &s->dest_addr,
856 ret = send(s->udp_fd, buf, size, 0);
858 return ret < 0 ? ff_neterrno() : ret;
861 static int udp_close(URLContext *h)
863 UDPContext *s = h->priv_data;
866 if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
867 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage);
868 closesocket(s->udp_fd);
869 #if HAVE_PTHREAD_CANCEL
870 if (s->thread_started) {
871 pthread_cancel(s->circular_buffer_thread);
872 ret = pthread_join(s->circular_buffer_thread, NULL);
874 av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret));
875 pthread_mutex_destroy(&s->mutex);
876 pthread_cond_destroy(&s->cond);
879 av_fifo_freep(&s->fifo);
883 URLProtocol ff_udp_protocol = {
885 .url_open = udp_open,
886 .url_read = udp_read,
887 .url_write = udp_write,
888 .url_close = udp_close,
889 .url_get_file_handle = udp_get_file_handle,
890 .priv_data_size = sizeof(UDPContext),
891 .priv_data_class = &udp_context_class,
892 .flags = URL_PROTOCOL_FLAG_NETWORK,