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udp.c
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1 /*
2  * UDP prototype streaming system
3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 /**
23  * @file
24  * UDP protocol
25  */
26 
27 #define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
28 
29 #include "avformat.h"
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"
38 #include "internal.h"
39 #include "network.h"
40 #include "os_support.h"
41 #include "url.h"
42 
43 #if HAVE_UDPLITE_H
44 #include "udplite.h"
45 #else
46 /* On many Linux systems, udplite.h is missing but the kernel supports UDP-Lite.
47  * So, we provide a fallback here.
48  */
49 #define UDPLITE_SEND_CSCOV 10
50 #define UDPLITE_RECV_CSCOV 11
51 #endif
52 
53 #ifndef IPPROTO_UDPLITE
54 #define IPPROTO_UDPLITE 136
55 #endif
56 
57 #if HAVE_PTHREAD_CANCEL
58 #include <pthread.h>
59 #endif
60 
61 #ifndef HAVE_PTHREAD_CANCEL
62 #define HAVE_PTHREAD_CANCEL 0
63 #endif
64 
65 #ifndef IPV6_ADD_MEMBERSHIP
66 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
67 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
68 #endif
69 
70 #define UDP_TX_BUF_SIZE 32768
71 #define UDP_MAX_PKT_SIZE 65536
72 #define UDP_HEADER_SIZE 8
73 
74 typedef struct UDPContext {
75  const AVClass *class;
76  int udp_fd;
77  int ttl;
80  int pkt_size;
89 
90  /* Circular Buffer variables for use in UDP receive code */
94 #if HAVE_PTHREAD_CANCEL
95  pthread_t circular_buffer_thread;
97  pthread_cond_t cond;
98  int thread_started;
99 #endif
102  char *localaddr;
103  int timeout;
105  char *sources;
106  char *block;
107 } UDPContext;
108 
109 #define OFFSET(x) offsetof(UDPContext, x)
110 #define D AV_OPT_FLAG_DECODING_PARAM
111 #define E AV_OPT_FLAG_ENCODING_PARAM
112 static const AVOption options[] = {
113  { "buffer_size", "System data size (in bytes)", OFFSET(buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
114  { "localport", "Local port", OFFSET(local_port), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, D|E },
115  { "local_port", "Local port", OFFSET(local_port), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
116  { "localaddr", "Local address", OFFSET(localaddr), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
117  { "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 },
118  { "pkt_size", "Maximum UDP packet size", OFFSET(pkt_size), AV_OPT_TYPE_INT, { .i64 = 1472 }, -1, INT_MAX, .flags = D|E },
119  { "reuse", "explicitly allow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, D|E },
120  { "reuse_socket", "explicitly allow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, .flags = D|E },
121  { "broadcast", "explicitly allow or disallow broadcast destination", OFFSET(is_broadcast), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
122  { "ttl", "Time to live (multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, INT_MAX, E },
123  { "connect", "set if connect() should be called on socket", OFFSET(is_connected), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
124  { "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 },
125  { "overrun_nonfatal", "survive in case of UDP receiving circular buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D },
126  { "timeout", "set raise error timeout (only in read mode)", OFFSET(timeout), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, D },
127  { "sources", "Source list", OFFSET(sources), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
128  { "block", "Block list", OFFSET(block), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
129  { NULL }
130 };
131 
132 static const AVClass udp_class = {
133  .class_name = "udp",
134  .item_name = av_default_item_name,
135  .option = options,
136  .version = LIBAVUTIL_VERSION_INT,
137 };
138 
140  .class_name = "udplite",
141  .item_name = av_default_item_name,
142  .option = options,
143  .version = LIBAVUTIL_VERSION_INT,
144 };
145 
146 static void log_net_error(void *ctx, int level, const char* prefix)
147 {
148  char errbuf[100];
149  av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
150  av_log(ctx, level, "%s: %s\n", prefix, errbuf);
151 }
152 
153 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
154  struct sockaddr *addr)
155 {
156 #ifdef IP_MULTICAST_TTL
157  if (addr->sa_family == AF_INET) {
158  if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
159  log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
160  return -1;
161  }
162  }
163 #endif
164 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
165  if (addr->sa_family == AF_INET6) {
166  if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
167  log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
168  return -1;
169  }
170  }
171 #endif
172  return 0;
173 }
174 
175 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
176 {
177 #ifdef IP_ADD_MEMBERSHIP
178  if (addr->sa_family == AF_INET) {
179  struct ip_mreq mreq;
180 
181  mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
182  if (local_addr)
183  mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
184  else
185  mreq.imr_interface.s_addr= INADDR_ANY;
186  if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
187  log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
188  return -1;
189  }
190  }
191 #endif
192 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
193  if (addr->sa_family == AF_INET6) {
194  struct ipv6_mreq mreq6;
195 
196  memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
197  mreq6.ipv6mr_interface= 0;
198  if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
199  log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
200  return -1;
201  }
202  }
203 #endif
204  return 0;
205 }
206 
207 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
208 {
209 #ifdef IP_DROP_MEMBERSHIP
210  if (addr->sa_family == AF_INET) {
211  struct ip_mreq mreq;
212 
213  mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
214  if (local_addr)
215  mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
216  else
217  mreq.imr_interface.s_addr= INADDR_ANY;
218  if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
219  log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
220  return -1;
221  }
222  }
223 #endif
224 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
225  if (addr->sa_family == AF_INET6) {
226  struct ipv6_mreq mreq6;
227 
228  memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
229  mreq6.ipv6mr_interface= 0;
230  if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
231  log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
232  return -1;
233  }
234  }
235 #endif
236  return 0;
237 }
238 
239 static struct addrinfo* udp_resolve_host(const char *hostname, int port,
240  int type, int family, int flags)
241 {
242  struct addrinfo hints = { 0 }, *res = 0;
243  int error;
244  char sport[16];
245  const char *node = 0, *service = "0";
246 
247  if (port > 0) {
248  snprintf(sport, sizeof(sport), "%d", port);
249  service = sport;
250  }
251  if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
252  node = hostname;
253  }
254  hints.ai_socktype = type;
255  hints.ai_family = family;
256  hints.ai_flags = flags;
257  if ((error = getaddrinfo(node, service, &hints, &res))) {
258  res = NULL;
259  av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
260  }
261 
262  return res;
263 }
264 
265 static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr,
266  int addr_len, char **sources,
267  int nb_sources, int include)
268 {
269 #if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32)
270  /* These ones are available in the microsoft SDK, but don't seem to work
271  * as on linux, so just prefer the v4-only approach there for now. */
272  int i;
273  for (i = 0; i < nb_sources; i++) {
274  struct group_source_req mreqs;
275  int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
276  struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
277  SOCK_DGRAM, AF_UNSPEC,
278  0);
279  if (!sourceaddr)
280  return AVERROR(ENOENT);
281 
282  mreqs.gsr_interface = 0;
283  memcpy(&mreqs.gsr_group, addr, addr_len);
284  memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen);
285  freeaddrinfo(sourceaddr);
286 
287  if (setsockopt(sockfd, level,
288  include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
289  (const void *)&mreqs, sizeof(mreqs)) < 0) {
290  if (include)
291  log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
292  else
293  log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
294  return ff_neterrno();
295  }
296  }
297 #elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
298  int i;
299  if (addr->sa_family != AF_INET) {
301  "Setting multicast sources only supported for IPv4\n");
302  return AVERROR(EINVAL);
303  }
304  for (i = 0; i < nb_sources; i++) {
305  struct ip_mreq_source mreqs;
306  struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
307  SOCK_DGRAM, AF_UNSPEC,
308  0);
309  if (!sourceaddr)
310  return AVERROR(ENOENT);
311  if (sourceaddr->ai_addr->sa_family != AF_INET) {
312  freeaddrinfo(sourceaddr);
313  av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n",
314  sources[i]);
315  return AVERROR(EINVAL);
316  }
317 
318  mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
319  mreqs.imr_interface.s_addr = INADDR_ANY;
320  mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr;
321  freeaddrinfo(sourceaddr);
322 
323  if (setsockopt(sockfd, IPPROTO_IP,
324  include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
325  (const void *)&mreqs, sizeof(mreqs)) < 0) {
326  if (include)
327  log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
328  else
329  log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
330  return ff_neterrno();
331  }
332  }
333 #else
334  return AVERROR(ENOSYS);
335 #endif
336  return 0;
337 }
338 static int udp_set_url(struct sockaddr_storage *addr,
339  const char *hostname, int port)
340 {
341  struct addrinfo *res0;
342  int addr_len;
343 
344  res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
345  if (!res0) return AVERROR(EIO);
346  memcpy(addr, res0->ai_addr, res0->ai_addrlen);
347  addr_len = res0->ai_addrlen;
348  freeaddrinfo(res0);
349 
350  return addr_len;
351 }
352 
353 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr,
354  socklen_t *addr_len, const char *localaddr)
355 {
356  int udp_fd = -1;
357  struct addrinfo *res0, *res;
358  int family = AF_UNSPEC;
359 
360  if (((struct sockaddr *) &s->dest_addr)->sa_family)
361  family = ((struct sockaddr *) &s->dest_addr)->sa_family;
362  res0 = udp_resolve_host((localaddr && localaddr[0]) ? localaddr : NULL, s->local_port,
363  SOCK_DGRAM, family, AI_PASSIVE);
364  if (!res0)
365  goto fail;
366  for (res = res0; res; res=res->ai_next) {
367  if (s->udplite_coverage)
368  udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, IPPROTO_UDPLITE);
369  else
370  udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, 0);
371  if (udp_fd != -1) break;
372  log_net_error(NULL, AV_LOG_ERROR, "socket");
373  }
374 
375  if (udp_fd < 0)
376  goto fail;
377 
378  memcpy(addr, res->ai_addr, res->ai_addrlen);
379  *addr_len = res->ai_addrlen;
380 
381  freeaddrinfo(res0);
382 
383  return udp_fd;
384 
385  fail:
386  if (udp_fd >= 0)
387  closesocket(udp_fd);
388  if(res0)
389  freeaddrinfo(res0);
390  return -1;
391 }
392 
393 static int udp_port(struct sockaddr_storage *addr, int addr_len)
394 {
395  char sbuf[sizeof(int)*3+1];
396  int error;
397 
398  if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
399  av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
400  return -1;
401  }
402 
403  return strtol(sbuf, NULL, 10);
404 }
405 
406 
407 /**
408  * If no filename is given to av_open_input_file because you want to
409  * get the local port first, then you must call this function to set
410  * the remote server address.
411  *
412  * url syntax: udp://host:port[?option=val...]
413  * option: 'ttl=n' : set the ttl value (for multicast only)
414  * 'localport=n' : set the local port
415  * 'pkt_size=n' : set max packet size
416  * 'reuse=1' : enable reusing the socket
417  * 'overrun_nonfatal=1': survive in case of circular buffer overrun
418  *
419  * @param h media file context
420  * @param uri of the remote server
421  * @return zero if no error.
422  */
423 int ff_udp_set_remote_url(URLContext *h, const char *uri)
424 {
425  UDPContext *s = h->priv_data;
426  char hostname[256], buf[10];
427  int port;
428  const char *p;
429 
430  av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
431 
432  /* set the destination address */
433  s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
434  if (s->dest_addr_len < 0) {
435  return AVERROR(EIO);
436  }
437  s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
438  p = strchr(uri, '?');
439  if (p) {
440  if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
441  int was_connected = s->is_connected;
442  s->is_connected = strtol(buf, NULL, 10);
443  if (s->is_connected && !was_connected) {
444  if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
445  s->dest_addr_len)) {
446  s->is_connected = 0;
447  log_net_error(h, AV_LOG_ERROR, "connect");
448  return AVERROR(EIO);
449  }
450  }
451  }
452  }
453 
454  return 0;
455 }
456 
457 /**
458  * Return the local port used by the UDP connection
459  * @param h media file context
460  * @return the local port number
461  */
463 {
464  UDPContext *s = h->priv_data;
465  return s->local_port;
466 }
467 
468 /**
469  * Return the udp file handle for select() usage to wait for several RTP
470  * streams at the same time.
471  * @param h media file context
472  */
474 {
475  UDPContext *s = h->priv_data;
476  return s->udp_fd;
477 }
478 
479 #if HAVE_PTHREAD_CANCEL
480 static void *circular_buffer_task( void *_URLContext)
481 {
482  URLContext *h = _URLContext;
483  UDPContext *s = h->priv_data;
484  int old_cancelstate;
485 
486  pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
487  pthread_mutex_lock(&s->mutex);
488  if (ff_socket_nonblock(s->udp_fd, 0) < 0) {
489  av_log(h, AV_LOG_ERROR, "Failed to set blocking mode");
490  s->circular_buffer_error = AVERROR(EIO);
491  goto end;
492  }
493  while(1) {
494  int len;
495 
496  pthread_mutex_unlock(&s->mutex);
497  /* Blocking operations are always cancellation points;
498  see "General Information" / "Thread Cancelation Overview"
499  in Single Unix. */
500  pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
501  len = recv(s->udp_fd, s->tmp+4, sizeof(s->tmp)-4, 0);
502  pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
503  pthread_mutex_lock(&s->mutex);
504  if (len < 0) {
505  if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) {
507  goto end;
508  }
509  continue;
510  }
511  AV_WL32(s->tmp, len);
512 
513  if(av_fifo_space(s->fifo) < len + 4) {
514  /* No Space left */
515  if (s->overrun_nonfatal) {
516  av_log(h, AV_LOG_WARNING, "Circular buffer overrun. "
517  "Surviving due to overrun_nonfatal option\n");
518  continue;
519  } else {
520  av_log(h, AV_LOG_ERROR, "Circular buffer overrun. "
521  "To avoid, increase fifo_size URL option. "
522  "To survive in such case, use overrun_nonfatal option\n");
523  s->circular_buffer_error = AVERROR(EIO);
524  goto end;
525  }
526  }
527  av_fifo_generic_write(s->fifo, s->tmp, len+4, NULL);
528  pthread_cond_signal(&s->cond);
529  }
530 
531 end:
532  pthread_cond_signal(&s->cond);
533  pthread_mutex_unlock(&s->mutex);
534  return NULL;
535 }
536 #endif
537 
538 static int parse_source_list(char *buf, char **sources, int *num_sources,
539  int max_sources)
540 {
541  char *source_start;
542 
543  source_start = buf;
544  while (1) {
545  char *next = strchr(source_start, ',');
546  if (next)
547  *next = '\0';
548  sources[*num_sources] = av_strdup(source_start);
549  if (!sources[*num_sources])
550  return AVERROR(ENOMEM);
551  source_start = next + 1;
552  (*num_sources)++;
553  if (*num_sources >= max_sources || !next)
554  break;
555  }
556  return 0;
557 }
558 
559 /* put it in UDP context */
560 /* return non zero if error */
561 static int udp_open(URLContext *h, const char *uri, int flags)
562 {
563  char hostname[1024], localaddr[1024] = "";
564  int port, udp_fd = -1, tmp, bind_ret = -1, dscp = -1;
565  UDPContext *s = h->priv_data;
566  int is_output;
567  const char *p;
568  char buf[256];
569  struct sockaddr_storage my_addr;
570  socklen_t len;
571  int i, num_include_sources = 0, num_exclude_sources = 0;
572  char *include_sources[32], *exclude_sources[32];
573 
574  h->is_streamed = 1;
575 
576  is_output = !(flags & AVIO_FLAG_READ);
577  if (s->buffer_size < 0)
578  s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
579 
580  if (s->sources) {
581  if (parse_source_list(s->sources, include_sources,
582  &num_include_sources,
583  FF_ARRAY_ELEMS(include_sources)))
584  goto fail;
585  }
586 
587  if (s->block) {
588  if (parse_source_list(s->block, exclude_sources, &num_exclude_sources,
589  FF_ARRAY_ELEMS(exclude_sources)))
590  goto fail;
591  }
592 
593  if (s->pkt_size > 0)
594  h->max_packet_size = s->pkt_size;
595 
596  p = strchr(uri, '?');
597  if (p) {
598  if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
599  char *endptr = NULL;
600  s->reuse_socket = strtol(buf, &endptr, 10);
601  /* assume if no digits were found it is a request to enable it */
602  if (buf == endptr)
603  s->reuse_socket = 1;
604  }
605  if (av_find_info_tag(buf, sizeof(buf), "overrun_nonfatal", p)) {
606  char *endptr = NULL;
607  s->overrun_nonfatal = strtol(buf, &endptr, 10);
608  /* assume if no digits were found it is a request to enable it */
609  if (buf == endptr)
610  s->overrun_nonfatal = 1;
611  if (!HAVE_PTHREAD_CANCEL)
613  "'overrun_nonfatal' option was set but it is not supported "
614  "on this build (pthread support is required)\n");
615  }
616  if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
617  s->ttl = strtol(buf, NULL, 10);
618  }
619  if (av_find_info_tag(buf, sizeof(buf), "udplite_coverage", p)) {
620  s->udplite_coverage = strtol(buf, NULL, 10);
621  }
622  if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
623  s->local_port = strtol(buf, NULL, 10);
624  }
625  if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
626  s->pkt_size = strtol(buf, NULL, 10);
627  }
628  if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
629  s->buffer_size = strtol(buf, NULL, 10);
630  }
631  if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
632  s->is_connected = strtol(buf, NULL, 10);
633  }
634  if (av_find_info_tag(buf, sizeof(buf), "dscp", p)) {
635  dscp = strtol(buf, NULL, 10);
636  }
637  if (av_find_info_tag(buf, sizeof(buf), "fifo_size", p)) {
638  s->circular_buffer_size = strtol(buf, NULL, 10);
639  if (!HAVE_PTHREAD_CANCEL)
641  "'circular_buffer_size' option was set but it is not supported "
642  "on this build (pthread support is required)\n");
643  }
644  if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
645  av_strlcpy(localaddr, buf, sizeof(localaddr));
646  }
647  if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
648  if (parse_source_list(buf, include_sources, &num_include_sources,
649  FF_ARRAY_ELEMS(include_sources)))
650  goto fail;
651  }
652  if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
653  if (parse_source_list(buf, exclude_sources, &num_exclude_sources,
654  FF_ARRAY_ELEMS(exclude_sources)))
655  goto fail;
656  }
657  if (!is_output && av_find_info_tag(buf, sizeof(buf), "timeout", p))
658  s->timeout = strtol(buf, NULL, 10);
659  if (is_output && av_find_info_tag(buf, sizeof(buf), "broadcast", p))
660  s->is_broadcast = strtol(buf, NULL, 10);
661  }
662  /* handling needed to support options picking from both AVOption and URL */
663  s->circular_buffer_size *= 188;
664  if (flags & AVIO_FLAG_WRITE) {
665  h->max_packet_size = s->pkt_size;
666  } else {
668  }
669  h->rw_timeout = s->timeout;
670 
671  /* fill the dest addr */
672  av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
673 
674  /* XXX: fix av_url_split */
675  if (hostname[0] == '\0' || hostname[0] == '?') {
676  /* only accepts null hostname if input */
677  if (!(flags & AVIO_FLAG_READ))
678  goto fail;
679  } else {
680  if (ff_udp_set_remote_url(h, uri) < 0)
681  goto fail;
682  }
683 
684  if ((s->is_multicast || s->local_port <= 0) && (h->flags & AVIO_FLAG_READ))
685  s->local_port = port;
686 
687  if (localaddr[0])
688  udp_fd = udp_socket_create(s, &my_addr, &len, localaddr);
689  else
690  udp_fd = udp_socket_create(s, &my_addr, &len, s->localaddr);
691  if (udp_fd < 0)
692  goto fail;
693 
694  s->local_addr_storage=my_addr; //store for future multicast join
695 
696  /* Follow the requested reuse option, unless it's multicast in which
697  * case enable reuse unless explicitly disabled.
698  */
699  if (s->reuse_socket > 0 || (s->is_multicast && s->reuse_socket < 0)) {
700  s->reuse_socket = 1;
701  if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
702  goto fail;
703  }
704 
705  if (s->is_broadcast) {
706 #ifdef SO_BROADCAST
707  if (setsockopt (udp_fd, SOL_SOCKET, SO_BROADCAST, &(s->is_broadcast), sizeof(s->is_broadcast)) != 0)
708 #endif
709  goto fail;
710  }
711 
712  /* Set the checksum coverage for UDP-Lite (RFC 3828) for sending and receiving.
713  * The receiver coverage has to be less than or equal to the sender coverage.
714  * Otherwise, the receiver will drop all packets.
715  */
716  if (s->udplite_coverage) {
717  if (setsockopt (udp_fd, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV, &(s->udplite_coverage), sizeof(s->udplite_coverage)) != 0)
718  av_log(h, AV_LOG_WARNING, "socket option UDPLITE_SEND_CSCOV not available");
719 
720  if (setsockopt (udp_fd, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV, &(s->udplite_coverage), sizeof(s->udplite_coverage)) != 0)
721  av_log(h, AV_LOG_WARNING, "socket option UDPLITE_RECV_CSCOV not available");
722  }
723 
724  if (dscp >= 0) {
725  dscp <<= 2;
726  if (setsockopt (udp_fd, IPPROTO_IP, IP_TOS, &dscp, sizeof(dscp)) != 0)
727  goto fail;
728  }
729 
730  /* If multicast, try binding the multicast address first, to avoid
731  * receiving UDP packets from other sources aimed at the same UDP
732  * port. This fails on windows. This makes sending to the same address
733  * using sendto() fail, so only do it if we're opened in read-only mode. */
734  if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) {
735  bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
736  }
737  /* bind to the local address if not multicast or if the multicast
738  * bind failed */
739  /* the bind is needed to give a port to the socket now */
740  if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
741  log_net_error(h, AV_LOG_ERROR, "bind failed");
742  goto fail;
743  }
744 
745  len = sizeof(my_addr);
746  getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
747  s->local_port = udp_port(&my_addr, len);
748 
749  if (s->is_multicast) {
750  if (h->flags & AVIO_FLAG_WRITE) {
751  /* output */
752  if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
753  goto fail;
754  }
755  if (h->flags & AVIO_FLAG_READ) {
756  /* input */
757  if (num_include_sources && num_exclude_sources) {
758  av_log(h, AV_LOG_ERROR, "Simultaneously including and excluding multicast sources is not supported\n");
759  goto fail;
760  }
761  if (num_include_sources) {
762  if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, include_sources, num_include_sources, 1) < 0)
763  goto fail;
764  } else {
765  if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage) < 0)
766  goto fail;
767  }
768  if (num_exclude_sources) {
769  if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, exclude_sources, num_exclude_sources, 0) < 0)
770  goto fail;
771  }
772  }
773  }
774 
775  if (is_output) {
776  /* limit the tx buf size to limit latency */
777  tmp = s->buffer_size;
778  if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
779  log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
780  goto fail;
781  }
782  } else {
783  /* set udp recv buffer size to the requested value (default 64K) */
784  tmp = s->buffer_size;
785  if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
786  log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
787  }
788  len = sizeof(tmp);
789  if (getsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, &len) < 0) {
790  log_net_error(h, AV_LOG_WARNING, "getsockopt(SO_RCVBUF)");
791  } else {
792  av_log(h, AV_LOG_DEBUG, "end receive buffer size reported is %d\n", tmp);
793  if(tmp < s->buffer_size)
794  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);
795  }
796 
797  /* make the socket non-blocking */
798  ff_socket_nonblock(udp_fd, 1);
799  }
800  if (s->is_connected) {
801  if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
802  log_net_error(h, AV_LOG_ERROR, "connect");
803  goto fail;
804  }
805  }
806 
807  for (i = 0; i < num_include_sources; i++)
808  av_freep(&include_sources[i]);
809  for (i = 0; i < num_exclude_sources; i++)
810  av_freep(&exclude_sources[i]);
811 
812  s->udp_fd = udp_fd;
813 
814 #if HAVE_PTHREAD_CANCEL
815  if (!is_output && s->circular_buffer_size) {
816  int ret;
817 
818  /* start the task going */
820  ret = pthread_mutex_init(&s->mutex, NULL);
821  if (ret != 0) {
822  av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret));
823  goto fail;
824  }
825  ret = pthread_cond_init(&s->cond, NULL);
826  if (ret != 0) {
827  av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret));
828  goto cond_fail;
829  }
830  ret = pthread_create(&s->circular_buffer_thread, NULL, circular_buffer_task, h);
831  if (ret != 0) {
832  av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret));
833  goto thread_fail;
834  }
835  s->thread_started = 1;
836  }
837 #endif
838 
839  return 0;
840 #if HAVE_PTHREAD_CANCEL
841  thread_fail:
842  pthread_cond_destroy(&s->cond);
843  cond_fail:
844  pthread_mutex_destroy(&s->mutex);
845 #endif
846  fail:
847  if (udp_fd >= 0)
848  closesocket(udp_fd);
849  av_fifo_freep(&s->fifo);
850  for (i = 0; i < num_include_sources; i++)
851  av_freep(&include_sources[i]);
852  for (i = 0; i < num_exclude_sources; i++)
853  av_freep(&exclude_sources[i]);
854  return AVERROR(EIO);
855 }
856 
857 static int udplite_open(URLContext *h, const char *uri, int flags)
858 {
859  UDPContext *s = h->priv_data;
860 
861  // set default checksum coverage
863 
864  return udp_open(h, uri, flags);
865 }
866 
867 static int udp_read(URLContext *h, uint8_t *buf, int size)
868 {
869  UDPContext *s = h->priv_data;
870  int ret;
871 #if HAVE_PTHREAD_CANCEL
872  int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK;
873 
874  if (s->fifo) {
875  pthread_mutex_lock(&s->mutex);
876  do {
877  avail = av_fifo_size(s->fifo);
878  if (avail) { // >=size) {
879  uint8_t tmp[4];
880 
881  av_fifo_generic_read(s->fifo, tmp, 4, NULL);
882  avail= AV_RL32(tmp);
883  if(avail > size){
884  av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n");
885  avail= size;
886  }
887 
888  av_fifo_generic_read(s->fifo, buf, avail, NULL);
889  av_fifo_drain(s->fifo, AV_RL32(tmp) - avail);
890  pthread_mutex_unlock(&s->mutex);
891  return avail;
892  } else if(s->circular_buffer_error){
893  int err = s->circular_buffer_error;
894  pthread_mutex_unlock(&s->mutex);
895  return err;
896  } else if(nonblock) {
897  pthread_mutex_unlock(&s->mutex);
898  return AVERROR(EAGAIN);
899  }
900  else {
901  /* FIXME: using the monotonic clock would be better,
902  but it does not exist on all supported platforms. */
903  int64_t t = av_gettime() + 100000;
904  struct timespec tv = { .tv_sec = t / 1000000,
905  .tv_nsec = (t % 1000000) * 1000 };
906  if (pthread_cond_timedwait(&s->cond, &s->mutex, &tv) < 0) {
907  pthread_mutex_unlock(&s->mutex);
908  return AVERROR(errno == ETIMEDOUT ? EAGAIN : errno);
909  }
910  nonblock = 1;
911  }
912  } while( 1);
913  }
914 #endif
915 
916  if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
917  ret = ff_network_wait_fd(s->udp_fd, 0);
918  if (ret < 0)
919  return ret;
920  }
921  ret = recv(s->udp_fd, buf, size, 0);
922 
923  return ret < 0 ? ff_neterrno() : ret;
924 }
925 
926 static int udp_write(URLContext *h, const uint8_t *buf, int size)
927 {
928  UDPContext *s = h->priv_data;
929  int ret;
930 
931  if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
932  ret = ff_network_wait_fd(s->udp_fd, 1);
933  if (ret < 0)
934  return ret;
935  }
936 
937  if (!s->is_connected) {
938  ret = sendto (s->udp_fd, buf, size, 0,
939  (struct sockaddr *) &s->dest_addr,
940  s->dest_addr_len);
941  } else
942  ret = send(s->udp_fd, buf, size, 0);
943 
944  return ret < 0 ? ff_neterrno() : ret;
945 }
946 
947 static int udp_close(URLContext *h)
948 {
949  UDPContext *s = h->priv_data;
950 
951  if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
952  udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage);
953  closesocket(s->udp_fd);
954 #if HAVE_PTHREAD_CANCEL
955  if (s->thread_started) {
956  int ret;
957  pthread_cancel(s->circular_buffer_thread);
958  ret = pthread_join(s->circular_buffer_thread, NULL);
959  if (ret != 0)
960  av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret));
961  pthread_mutex_destroy(&s->mutex);
962  pthread_cond_destroy(&s->cond);
963  }
964 #endif
965  av_fifo_freep(&s->fifo);
966  return 0;
967 }
968 
970  .name = "udp",
971  .url_open = udp_open,
972  .url_read = udp_read,
973  .url_write = udp_write,
974  .url_close = udp_close,
975  .url_get_file_handle = udp_get_file_handle,
976  .priv_data_size = sizeof(UDPContext),
977  .priv_data_class = &udp_class,
979 };
980 
982  .name = "udplite",
983  .url_open = udplite_open,
984  .url_read = udp_read,
985  .url_write = udp_write,
986  .url_close = udp_close,
987  .url_get_file_handle = udp_get_file_handle,
988  .priv_data_size = sizeof(UDPContext),
989  .priv_data_class = &udplite_context_class,
991 };
static int udp_open(URLContext *h, const char *uri, int flags)
Definition: udp.c:561
void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)
Split a URL string into components.
Definition: utils.c:3951
#define NULL
Definition: coverity.c:32
static const AVClass udplite_context_class
Definition: udp.c:139
const char * s
Definition: avisynth_c.h:631
static void log_net_error(void *ctx, int level, const char *prefix)
Definition: udp.c:146
static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
Definition: os2threads.h:94
#define URL_PROTOCOL_FLAG_NETWORK
Definition: url.h:35
#define NI_NUMERICSERV
Definition: network.h:193
#define HAVE_PTHREAD_CANCEL
Definition: udp.c:62
AVOption.
Definition: opt.h:255
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
char * block
Definition: udp.c:106
static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr, int addr_len, char **sources, int nb_sources, int include)
Definition: udp.c:265
int is_streamed
true if streamed (no seek possible), default = false
Definition: url.h:46
static int parse_source_list(char *buf, char **sources, int *num_sources, int max_sources)
Definition: udp.c:538
#define AVIO_FLAG_READ
read-only
Definition: avio.h:485
int64_t rw_timeout
maximum time to wait for (network) read/write operation completion, in mcs
Definition: url.h:49
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:486
#define AI_PASSIVE
Definition: network.h:169
#define UDPLITE_SEND_CSCOV
Definition: udp.c:49
#define IPPROTO_UDPLITE
Definition: udp.c:54
int flags
Definition: url.h:44
int udplite_coverage
Definition: udp.c:78
#define freeaddrinfo
Definition: network.h:208
static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
Definition: os2threads.h:124
int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int(*func)(void *, void *, int))
Feed data from a user-supplied callback to an AVFifoBuffer.
Definition: fifo.c:122
int ff_socket(int af, int type, int proto)
Definition: network.c:166
static struct addrinfo * udp_resolve_host(const char *hostname, int port, int type, int family, int flags)
Definition: udp.c:239
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define UDPLITE_RECV_CSCOV
Definition: udp.c:50
HMTX pthread_mutex_t
Definition: os2threads.h:40
uint8_t
AVOptions.
miscellaneous OS support macros and functions.
int ff_udp_get_local_port(URLContext *h)
Return the local port used by the UDP connection.
Definition: udp.c:462
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int av_fifo_space(const AVFifoBuffer *f)
Return the amount of space in bytes in the AVFifoBuffer, that is the amount of data you can write int...
Definition: fifo.c:82
int is_broadcast
Definition: udp.c:82
static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr, struct sockaddr *local_addr)
Definition: udp.c:207
#define UDP_HEADER_SIZE
Definition: udp.c:72
static int udp_port(struct sockaddr_storage *addr, int addr_len)
Definition: udp.c:393
int av_find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
Attempt to find a specific tag in a URL.
Definition: parseutils.c:677
static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
Definition: os2threads.h:131
ptrdiff_t size
Definition: opengl_enc.c:101
static int udp_close(URLContext *h)
Definition: udp.c:947
#define av_log(a,...)
int circular_buffer_size
Definition: udp.c:91
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int ff_udp_set_remote_url(URLContext *h, const char *uri)
If no filename is given to av_open_input_file because you want to get the local port first...
Definition: udp.c:423
av_default_item_name
#define closesocket
Definition: ffserver.c:28
#define AVERROR(e)
Definition: error.h:43
#define E
Definition: udp.c:111
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, void(*func)(void *, void *, int))
Feed data from an AVFifoBuffer to a user-supplied callback.
Definition: fifo.c:151
int reuse_socket
Definition: udp.c:84
#define UDP_TX_BUF_SIZE
Definition: udp.c:70
#define D
Definition: udp.c:110
int dest_addr_len
Definition: udp.c:87
int ff_is_multicast_address(struct sockaddr *addr)
Definition: network.c:131
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
#define fail()
Definition: checkasm.h:55
int timeout
Definition: udp.c:103
#define OFFSET(x)
Definition: udp.c:109
char * localaddr
Definition: udp.c:102
int ai_addrlen
Definition: network.h:132
static const AVOption options[]
Definition: udp.c:112
static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, socklen_t *addr_len, const char *localaddr)
Definition: udp.c:353
ret
Definition: avfilter.c:974
uint8_t tmp[UDP_MAX_PKT_SIZE+4]
Definition: udp.c:100
#define ff_neterrno()
Definition: network.h:64
URLProtocol ff_udplite_protocol
Definition: udp.c:981
int overrun_nonfatal
Definition: udp.c:85
static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
Definition: os2threads.h:80
static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
Definition: os2threads.h:87
static int udp_get_file_handle(URLContext *h)
Return the udp file handle for select() usage to wait for several RTP streams at the same time...
Definition: udp.c:473
int is_connected
Definition: udp.c:88
struct sockaddr_storage local_addr_storage
Definition: udp.c:104
static pthread_mutex_t * mutex
Definition: w32pthreads.h:166
Definition: udp.c:74
int ff_socket_nonblock(int socket, int enable)
#define FF_ARRAY_ELEMS(a)
int ttl
Definition: udp.c:77
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:39
static av_always_inline int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
Definition: os2threads.h:64
#define IPV6_ADD_MEMBERSHIP
Definition: udp.c:66
int av_fifo_size(const AVFifoBuffer *f)
Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from ...
Definition: fifo.c:77
char * av_strdup(const char *s)
Duplicate the string s.
Definition: mem.c:267
#define AVIO_FLAG_NONBLOCK
Use non-blocking mode.
Definition: avio.h:504
int local_port
Definition: udp.c:83
int pkt_size
Definition: udp.c:80
#define IPV6_DROP_MEMBERSHIP
Definition: udp.c:67
a very simple circular buffer FIFO implementation
void * buf
Definition: avisynth_c.h:553
Definition: url.h:39
GLint GLenum type
Definition: opengl_enc.c:105
static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port)
Definition: udp.c:338
Describe the class of an AVClass context structure.
Definition: log.h:67
char * sources
Definition: udp.c:105
void * priv_data
Definition: url.h:42
#define gai_strerror
Definition: network.h:215
AVFifoBuffer * fifo
Definition: udp.c:92
#define snprintf
Definition: snprintf.h:34
misc parsing utilities
const char * name
Definition: url.h:53
int ai_socktype
Definition: network.h:130
static int flags
Definition: cpu.c:47
uint8_t level
Definition: svq3.c:150
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
Definition: error.c:68
#define getaddrinfo
Definition: network.h:207
Main libavformat public API header.
URLProtocol ff_udp_protocol
Definition: udp.c:969
struct sockaddr_storage dest_addr
Definition: udp.c:86
static int udp_read(URLContext *h, uint8_t *buf, int size)
Definition: udp.c:867
int remaining_in_dg
Definition: udp.c:101
struct addrinfo * ai_next
Definition: network.h:135
static av_always_inline int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
Definition: os2threads.h:115
static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr)
Definition: udp.c:153
int udp_fd
Definition: udp.c:76
#define getnameinfo
Definition: network.h:209
AVFifoBuffer * av_fifo_alloc(unsigned int size)
Initialize an AVFifoBuffer.
Definition: fifo.c:43
static int udplite_open(URLContext *h, const char *uri, int flags)
Definition: udp.c:857
int len
static int udp_join_multicast_group(int sockfd, struct sockaddr *addr, struct sockaddr *local_addr)
Definition: udp.c:175
int circular_buffer_error
Definition: udp.c:93
static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
Definition: os2threads.h:108
int buffer_size
Definition: udp.c:79
int is_multicast
Definition: udp.c:81
int ai_flags
Definition: network.h:128
int max_packet_size
if non zero, the stream is packetized with this max packet size
Definition: url.h:45
static const AVClass udp_class
Definition: udp.c:132
#define UDP_MAX_PKT_SIZE
Definition: udp.c:71
#define av_freep(p)
int ff_network_wait_fd(int fd, int write)
Definition: network.c:73
unbuffered private I/O API
void av_fifo_freep(AVFifoBuffer **f)
Free an AVFifoBuffer and reset pointer to NULL.
Definition: fifo.c:63
static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
Definition: os2threads.h:101
void av_fifo_drain(AVFifoBuffer *f, int size)
Discard data from the FIFO.
Definition: fifo.c:171
struct sockaddr * ai_addr
Definition: network.h:133
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
static int udp_write(URLContext *h, const uint8_t *buf, int size)
Definition: udp.c:926
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
int ai_family
Definition: network.h:129
static int16_t block[64]
Definition: dct-test.c:110