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"
46 /* On many Linux systems, udplite.h is missing but the kernel supports UDP-Lite.
47 * So, we provide a fallback here.
49 #define UDPLITE_SEND_CSCOV 10
50 #define UDPLITE_RECV_CSCOV 11
53 #ifndef IPPROTO_UDPLITE
54 #define IPPROTO_UDPLITE 136
57 #if HAVE_PTHREAD_CANCEL
61 #ifndef HAVE_PTHREAD_CANCEL
62 #define HAVE_PTHREAD_CANCEL 0
65 #ifndef IPV6_ADD_MEMBERSHIP
66 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
67 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
70 #define UDP_TX_BUF_SIZE 32768
71 #define UDP_MAX_PKT_SIZE 65536
72 #define UDP_HEADER_SIZE 8
85 struct sockaddr_storage dest_addr;
89 /* Circular Buffer variables for use in UDP receive code */
90 int circular_buffer_size;
92 int circular_buffer_error;
93 #if HAVE_PTHREAD_CANCEL
94 pthread_t circular_buffer_thread;
95 pthread_mutex_t mutex;
99 uint8_t tmp[UDP_MAX_PKT_SIZE+4];
104 struct sockaddr_storage local_addr_storage;
107 #define OFFSET(x) offsetof(UDPContext, x)
108 #define D AV_OPT_FLAG_DECODING_PARAM
109 #define E AV_OPT_FLAG_ENCODING_PARAM
110 static const AVOption options[] = {
111 {"buffer_size", "set packet buffer size in bytes", OFFSET(buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
112 {"localport", "set local port to bind to", OFFSET(local_port), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
113 {"localaddr", "choose local IP address", OFFSET(local_addr), AV_OPT_TYPE_STRING, {.str = ""}, 0, 0, D|E },
114 {"udplite_coverage", "choose UDPLite head size which should be validated by checksum", OFFSET(udplite_coverage), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
115 {"pkt_size", "set size of UDP packets", OFFSET(packet_size), AV_OPT_TYPE_INT, {.i64 = 1472}, 0, INT_MAX, D|E },
116 {"reuse", "explicitly allow or disallow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
117 {"broadcast", "explicitly allow or disallow broadcast destination", OFFSET(is_broadcast), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
118 {"ttl", "set the time to live value (for multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, {.i64 = 16}, 0, INT_MAX, E },
119 {"connect", "set if connect() should be called on socket", OFFSET(is_connected), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
120 /* TODO 'sources', 'block' option */
121 {"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 },
122 {"overrun_nonfatal", "survive in case of UDP receiving circular buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D },
123 {"timeout", "set raise error timeout (only in read mode)", OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D },
127 static const AVClass udp_context_class = {
129 .item_name = av_default_item_name,
131 .version = LIBAVUTIL_VERSION_INT,
134 static const AVClass udplite_context_class = {
135 .class_name = "udplite",
136 .item_name = av_default_item_name,
138 .version = LIBAVUTIL_VERSION_INT,
141 static void log_net_error(void *ctx, int level, const char* prefix)
144 av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
145 av_log(ctx, level, "%s: %s\n", prefix, errbuf);
148 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
149 struct sockaddr *addr)
151 #ifdef IP_MULTICAST_TTL
152 if (addr->sa_family == AF_INET) {
153 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
154 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
159 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
160 if (addr->sa_family == AF_INET6) {
161 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
162 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
170 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
172 #ifdef IP_ADD_MEMBERSHIP
173 if (addr->sa_family == AF_INET) {
176 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
178 mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
180 mreq.imr_interface.s_addr= INADDR_ANY;
181 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
182 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
187 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
188 if (addr->sa_family == AF_INET6) {
189 struct ipv6_mreq mreq6;
191 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
192 mreq6.ipv6mr_interface= 0;
193 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
194 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
202 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
204 #ifdef IP_DROP_MEMBERSHIP
205 if (addr->sa_family == AF_INET) {
208 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
210 mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
212 mreq.imr_interface.s_addr= INADDR_ANY;
213 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
214 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
219 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
220 if (addr->sa_family == AF_INET6) {
221 struct ipv6_mreq mreq6;
223 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
224 mreq6.ipv6mr_interface= 0;
225 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
226 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
234 static struct addrinfo* udp_resolve_host(const char *hostname, int port,
235 int type, int family, int flags)
237 struct addrinfo hints = { 0 }, *res = 0;
240 const char *node = 0, *service = "0";
243 snprintf(sport, sizeof(sport), "%d", port);
246 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
249 hints.ai_socktype = type;
250 hints.ai_family = family;
251 hints.ai_flags = flags;
252 if ((error = getaddrinfo(node, service, &hints, &res))) {
254 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
260 static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr,
261 int addr_len, char **sources,
262 int nb_sources, int include)
264 #if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32)
265 /* These ones are available in the microsoft SDK, but don't seem to work
266 * as on linux, so just prefer the v4-only approach there for now. */
268 for (i = 0; i < nb_sources; i++) {
269 struct group_source_req mreqs;
270 int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
271 struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
272 SOCK_DGRAM, AF_UNSPEC,
275 return AVERROR(ENOENT);
277 mreqs.gsr_interface = 0;
278 memcpy(&mreqs.gsr_group, addr, addr_len);
279 memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen);
280 freeaddrinfo(sourceaddr);
282 if (setsockopt(sockfd, level,
283 include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
284 (const void *)&mreqs, sizeof(mreqs)) < 0) {
286 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
288 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
289 return ff_neterrno();
292 #elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
294 if (addr->sa_family != AF_INET) {
295 av_log(NULL, AV_LOG_ERROR,
296 "Setting multicast sources only supported for IPv4\n");
297 return AVERROR(EINVAL);
299 for (i = 0; i < nb_sources; i++) {
300 struct ip_mreq_source mreqs;
301 struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
302 SOCK_DGRAM, AF_UNSPEC,
305 return AVERROR(ENOENT);
306 if (sourceaddr->ai_addr->sa_family != AF_INET) {
307 freeaddrinfo(sourceaddr);
308 av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n",
310 return AVERROR(EINVAL);
313 mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
314 mreqs.imr_interface.s_addr = INADDR_ANY;
315 mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr;
316 freeaddrinfo(sourceaddr);
318 if (setsockopt(sockfd, IPPROTO_IP,
319 include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
320 (const void *)&mreqs, sizeof(mreqs)) < 0) {
322 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
324 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
325 return ff_neterrno();
329 return AVERROR(ENOSYS);
333 static int udp_set_url(struct sockaddr_storage *addr,
334 const char *hostname, int port)
336 struct addrinfo *res0;
339 res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
340 if (!res0) return AVERROR(EIO);
341 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
342 addr_len = res0->ai_addrlen;
348 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr,
349 socklen_t *addr_len, const char *localaddr)
352 struct addrinfo *res0, *res;
353 int family = AF_UNSPEC;
355 if (((struct sockaddr *) &s->dest_addr)->sa_family)
356 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
357 res0 = udp_resolve_host(localaddr[0] ? localaddr : NULL, s->local_port,
358 SOCK_DGRAM, family, AI_PASSIVE);
361 for (res = res0; res; res=res->ai_next) {
362 if (s->udplite_coverage)
363 udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, IPPROTO_UDPLITE);
365 udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, 0);
366 if (udp_fd != -1) break;
367 log_net_error(NULL, AV_LOG_ERROR, "socket");
373 memcpy(addr, res->ai_addr, res->ai_addrlen);
374 *addr_len = res->ai_addrlen;
388 static int udp_port(struct sockaddr_storage *addr, int addr_len)
390 char sbuf[sizeof(int)*3+1];
393 if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
394 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
398 return strtol(sbuf, NULL, 10);
403 * If no filename is given to av_open_input_file because you want to
404 * get the local port first, then you must call this function to set
405 * the remote server address.
407 * url syntax: udp://host:port[?option=val...]
408 * option: 'ttl=n' : set the ttl value (for multicast only)
409 * 'localport=n' : set the local port
410 * 'pkt_size=n' : set max packet size
411 * 'reuse=1' : enable reusing the socket
412 * 'overrun_nonfatal=1': survive in case of circular buffer overrun
414 * @param h media file context
415 * @param uri of the remote server
416 * @return zero if no error.
418 int ff_udp_set_remote_url(URLContext *h, const char *uri)
420 UDPContext *s = h->priv_data;
421 char hostname[256], buf[10];
425 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
427 /* set the destination address */
428 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
429 if (s->dest_addr_len < 0) {
432 s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
433 p = strchr(uri, '?');
435 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
436 int was_connected = s->is_connected;
437 s->is_connected = strtol(buf, NULL, 10);
438 if (s->is_connected && !was_connected) {
439 if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
442 log_net_error(h, AV_LOG_ERROR, "connect");
453 * Return the local port used by the UDP connection
454 * @param h media file context
455 * @return the local port number
457 int ff_udp_get_local_port(URLContext *h)
459 UDPContext *s = h->priv_data;
460 return s->local_port;
464 * Return the udp file handle for select() usage to wait for several RTP
465 * streams at the same time.
466 * @param h media file context
468 static int udp_get_file_handle(URLContext *h)
470 UDPContext *s = h->priv_data;
474 #if HAVE_PTHREAD_CANCEL
475 static void *circular_buffer_task( void *_URLContext)
477 URLContext *h = _URLContext;
478 UDPContext *s = h->priv_data;
481 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
482 pthread_mutex_lock(&s->mutex);
483 if (ff_socket_nonblock(s->udp_fd, 0) < 0) {
484 av_log(h, AV_LOG_ERROR, "Failed to set blocking mode");
485 s->circular_buffer_error = AVERROR(EIO);
491 pthread_mutex_unlock(&s->mutex);
492 /* Blocking operations are always cancellation points;
493 see "General Information" / "Thread Cancelation Overview"
495 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
496 len = recv(s->udp_fd, s->tmp+4, sizeof(s->tmp)-4, 0);
497 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
498 pthread_mutex_lock(&s->mutex);
500 if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) {
501 s->circular_buffer_error = ff_neterrno();
506 AV_WL32(s->tmp, len);
508 if(av_fifo_space(s->fifo) < len + 4) {
510 if (s->overrun_nonfatal) {
511 av_log(h, AV_LOG_WARNING, "Circular buffer overrun. "
512 "Surviving due to overrun_nonfatal option\n");
515 av_log(h, AV_LOG_ERROR, "Circular buffer overrun. "
516 "To avoid, increase fifo_size URL option. "
517 "To survive in such case, use overrun_nonfatal option\n");
518 s->circular_buffer_error = AVERROR(EIO);
522 av_fifo_generic_write(s->fifo, s->tmp, len+4, NULL);
523 pthread_cond_signal(&s->cond);
527 pthread_cond_signal(&s->cond);
528 pthread_mutex_unlock(&s->mutex);
533 static int parse_source_list(char *buf, char **sources, int *num_sources,
540 char *next = strchr(source_start, ',');
543 sources[*num_sources] = av_strdup(source_start);
544 if (!sources[*num_sources])
545 return AVERROR(ENOMEM);
546 source_start = next + 1;
548 if (*num_sources >= max_sources || !next)
554 /* put it in UDP context */
555 /* return non zero if error */
556 static int udp_open(URLContext *h, const char *uri, int flags)
558 char hostname[1024], localaddr[1024] = "";
559 int port, udp_fd = -1, tmp, bind_ret = -1, dscp = -1;
560 UDPContext *s = h->priv_data;
564 struct sockaddr_storage my_addr;
566 int reuse_specified = 0;
567 int i, num_include_sources = 0, num_exclude_sources = 0;
568 char *include_sources[32], *exclude_sources[32];
572 is_output = !(flags & AVIO_FLAG_READ);
573 if (!s->buffer_size) /* if not set explicitly */
574 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
576 p = strchr(uri, '?');
578 if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
580 s->reuse_socket = strtol(buf, &endptr, 10);
581 /* assume if no digits were found it is a request to enable it */
586 if (av_find_info_tag(buf, sizeof(buf), "overrun_nonfatal", p)) {
588 s->overrun_nonfatal = strtol(buf, &endptr, 10);
589 /* assume if no digits were found it is a request to enable it */
591 s->overrun_nonfatal = 1;
592 if (!HAVE_PTHREAD_CANCEL)
593 av_log(h, AV_LOG_WARNING,
594 "'overrun_nonfatal' option was set but it is not supported "
595 "on this build (pthread support is required)\n");
597 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
598 s->ttl = strtol(buf, NULL, 10);
600 if (av_find_info_tag(buf, sizeof(buf), "udplite_coverage", p)) {
601 s->udplite_coverage = strtol(buf, NULL, 10);
603 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
604 s->local_port = strtol(buf, NULL, 10);
606 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
607 s->packet_size = strtol(buf, NULL, 10);
609 if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
610 s->buffer_size = strtol(buf, NULL, 10);
612 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
613 s->is_connected = strtol(buf, NULL, 10);
615 if (av_find_info_tag(buf, sizeof(buf), "dscp", p)) {
616 dscp = strtol(buf, NULL, 10);
618 if (av_find_info_tag(buf, sizeof(buf), "fifo_size", p)) {
619 s->circular_buffer_size = strtol(buf, NULL, 10);
620 if (!HAVE_PTHREAD_CANCEL)
621 av_log(h, AV_LOG_WARNING,
622 "'circular_buffer_size' option was set but it is not supported "
623 "on this build (pthread support is required)\n");
625 if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
626 av_strlcpy(localaddr, buf, sizeof(localaddr));
628 if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
629 if (parse_source_list(buf, include_sources, &num_include_sources,
630 FF_ARRAY_ELEMS(include_sources)))
633 if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
634 if (parse_source_list(buf, exclude_sources, &num_exclude_sources,
635 FF_ARRAY_ELEMS(exclude_sources)))
638 if (!is_output && av_find_info_tag(buf, sizeof(buf), "timeout", p))
639 s->timeout = strtol(buf, NULL, 10);
640 if (is_output && av_find_info_tag(buf, sizeof(buf), "broadcast", p))
641 s->is_broadcast = strtol(buf, NULL, 10);
643 /* handling needed to support options picking from both AVOption and URL */
644 s->circular_buffer_size *= 188;
645 if (flags & AVIO_FLAG_WRITE) {
646 h->max_packet_size = s->packet_size;
648 h->max_packet_size = UDP_MAX_PKT_SIZE;
650 h->rw_timeout = s->timeout;
652 /* fill the dest addr */
653 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
655 /* XXX: fix av_url_split */
656 if (hostname[0] == '\0' || hostname[0] == '?') {
657 /* only accepts null hostname if input */
658 if (!(flags & AVIO_FLAG_READ))
661 if (ff_udp_set_remote_url(h, uri) < 0)
665 if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ))
666 s->local_port = port;
667 udp_fd = udp_socket_create(s, &my_addr, &len, localaddr[0] ? localaddr : s->local_addr);
671 s->local_addr_storage=my_addr; //store for future multicast join
673 /* Follow the requested reuse option, unless it's multicast in which
674 * case enable reuse unless explicitly disabled.
676 if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
678 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
682 if (s->is_broadcast) {
684 if (setsockopt (udp_fd, SOL_SOCKET, SO_BROADCAST, &(s->is_broadcast), sizeof(s->is_broadcast)) != 0)
689 /* Set the checksum coverage for UDP-Lite (RFC 3828) for sending and receiving.
690 * The receiver coverage has to be less than or equal to the sender coverage.
691 * Otherwise, the receiver will drop all packets.
693 if (s->udplite_coverage) {
694 if (setsockopt (udp_fd, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV, &(s->udplite_coverage), sizeof(s->udplite_coverage)) != 0)
695 av_log(h, AV_LOG_WARNING, "socket option UDPLITE_SEND_CSCOV not available");
697 if (setsockopt (udp_fd, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV, &(s->udplite_coverage), sizeof(s->udplite_coverage)) != 0)
698 av_log(h, AV_LOG_WARNING, "socket option UDPLITE_RECV_CSCOV not available");
703 if (setsockopt (udp_fd, IPPROTO_IP, IP_TOS, &dscp, sizeof(dscp)) != 0)
707 /* If multicast, try binding the multicast address first, to avoid
708 * receiving UDP packets from other sources aimed at the same UDP
709 * port. This fails on windows. This makes sending to the same address
710 * using sendto() fail, so only do it if we're opened in read-only mode. */
711 if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) {
712 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
714 /* bind to the local address if not multicast or if the multicast
716 /* the bind is needed to give a port to the socket now */
717 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
718 log_net_error(h, AV_LOG_ERROR, "bind failed");
722 len = sizeof(my_addr);
723 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
724 s->local_port = udp_port(&my_addr, len);
726 if (s->is_multicast) {
727 if (h->flags & AVIO_FLAG_WRITE) {
729 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
732 if (h->flags & AVIO_FLAG_READ) {
734 if (num_include_sources && num_exclude_sources) {
735 av_log(h, AV_LOG_ERROR, "Simultaneously including and excluding multicast sources is not supported\n");
738 if (num_include_sources) {
739 if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, include_sources, num_include_sources, 1) < 0)
742 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage) < 0)
745 if (num_exclude_sources) {
746 if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, exclude_sources, num_exclude_sources, 0) < 0)
753 /* limit the tx buf size to limit latency */
754 tmp = s->buffer_size;
755 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
756 log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
760 /* set udp recv buffer size to the requested value (default 64K) */
761 tmp = s->buffer_size;
762 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
763 log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
766 if (getsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, &len) < 0) {
767 log_net_error(h, AV_LOG_WARNING, "getsockopt(SO_RCVBUF)");
769 av_log(h, AV_LOG_DEBUG, "end receive buffer size reported is %d\n", tmp);
770 if(tmp < s->buffer_size)
771 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);
774 /* make the socket non-blocking */
775 ff_socket_nonblock(udp_fd, 1);
777 if (s->is_connected) {
778 if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
779 log_net_error(h, AV_LOG_ERROR, "connect");
784 for (i = 0; i < num_include_sources; i++)
785 av_freep(&include_sources[i]);
786 for (i = 0; i < num_exclude_sources; i++)
787 av_freep(&exclude_sources[i]);
791 #if HAVE_PTHREAD_CANCEL
792 if (!is_output && s->circular_buffer_size) {
795 /* start the task going */
796 s->fifo = av_fifo_alloc(s->circular_buffer_size);
797 ret = pthread_mutex_init(&s->mutex, NULL);
799 av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret));
802 ret = pthread_cond_init(&s->cond, NULL);
804 av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret));
807 ret = pthread_create(&s->circular_buffer_thread, NULL, circular_buffer_task, h);
809 av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret));
812 s->thread_started = 1;
817 #if HAVE_PTHREAD_CANCEL
819 pthread_cond_destroy(&s->cond);
821 pthread_mutex_destroy(&s->mutex);
826 av_fifo_freep(&s->fifo);
827 for (i = 0; i < num_include_sources; i++)
828 av_freep(&include_sources[i]);
829 for (i = 0; i < num_exclude_sources; i++)
830 av_freep(&exclude_sources[i]);
834 static int udplite_open(URLContext *h, const char *uri, int flags)
836 UDPContext *s = h->priv_data;
838 // set default checksum coverage
839 s->udplite_coverage = UDP_HEADER_SIZE;
841 return udp_open(h, uri, flags);
844 static int udp_read(URLContext *h, uint8_t *buf, int size)
846 UDPContext *s = h->priv_data;
848 #if HAVE_PTHREAD_CANCEL
849 int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK;
852 pthread_mutex_lock(&s->mutex);
854 avail = av_fifo_size(s->fifo);
855 if (avail) { // >=size) {
858 av_fifo_generic_read(s->fifo, tmp, 4, NULL);
861 av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n");
865 av_fifo_generic_read(s->fifo, buf, avail, NULL);
866 av_fifo_drain(s->fifo, AV_RL32(tmp) - avail);
867 pthread_mutex_unlock(&s->mutex);
869 } else if(s->circular_buffer_error){
870 int err = s->circular_buffer_error;
871 pthread_mutex_unlock(&s->mutex);
873 } else if(nonblock) {
874 pthread_mutex_unlock(&s->mutex);
875 return AVERROR(EAGAIN);
878 /* FIXME: using the monotonic clock would be better,
879 but it does not exist on all supported platforms. */
880 int64_t t = av_gettime() + 100000;
881 struct timespec tv = { .tv_sec = t / 1000000,
882 .tv_nsec = (t % 1000000) * 1000 };
883 if (pthread_cond_timedwait(&s->cond, &s->mutex, &tv) < 0) {
884 pthread_mutex_unlock(&s->mutex);
885 return AVERROR(errno == ETIMEDOUT ? EAGAIN : errno);
893 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
894 ret = ff_network_wait_fd(s->udp_fd, 0);
898 ret = recv(s->udp_fd, buf, size, 0);
900 return ret < 0 ? ff_neterrno() : ret;
903 static int udp_write(URLContext *h, const uint8_t *buf, int size)
905 UDPContext *s = h->priv_data;
908 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
909 ret = ff_network_wait_fd(s->udp_fd, 1);
914 if (!s->is_connected) {
915 ret = sendto (s->udp_fd, buf, size, 0,
916 (struct sockaddr *) &s->dest_addr,
919 ret = send(s->udp_fd, buf, size, 0);
921 return ret < 0 ? ff_neterrno() : ret;
924 static int udp_close(URLContext *h)
926 UDPContext *s = h->priv_data;
928 if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
929 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage);
930 closesocket(s->udp_fd);
931 #if HAVE_PTHREAD_CANCEL
932 if (s->thread_started) {
934 pthread_cancel(s->circular_buffer_thread);
935 ret = pthread_join(s->circular_buffer_thread, NULL);
937 av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret));
938 pthread_mutex_destroy(&s->mutex);
939 pthread_cond_destroy(&s->cond);
942 av_fifo_freep(&s->fifo);
946 URLProtocol ff_udp_protocol = {
948 .url_open = udp_open,
949 .url_read = udp_read,
950 .url_write = udp_write,
951 .url_close = udp_close,
952 .url_get_file_handle = udp_get_file_handle,
953 .priv_data_size = sizeof(UDPContext),
954 .priv_data_class = &udp_context_class,
955 .flags = URL_PROTOCOL_FLAG_NETWORK,
958 URLProtocol ff_udplite_protocol = {
960 .url_open = udplite_open,
961 .url_read = udp_read,
962 .url_write = udp_write,
963 .url_close = udp_close,
964 .url_get_file_handle = udp_get_file_handle,
965 .priv_data_size = sizeof(UDPContext),
966 .priv_data_class = &udplite_context_class,
967 .flags = URL_PROTOCOL_FLAG_NETWORK,