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_PTHREAD_CANCEL 44#include <pthread.h> 45#endif 46 47#ifndef HAVE_PTHREAD_CANCEL 48#define HAVE_PTHREAD_CANCEL 0 49#endif 50 51#ifndef IPV6_ADD_MEMBERSHIP 52#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP 53#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP 54#endif 55 56#define UDP_TX_BUF_SIZE 32768 57#define UDP_MAX_PKT_SIZE 65536 58 59typedef struct { 60 const AVClass *class; 61 int udp_fd; 62 int ttl; 63 int buffer_size; 64 int is_multicast; 65 int is_broadcast; 66 int local_port; 67 int reuse_socket; 68 int overrun_nonfatal; 69 struct sockaddr_storage dest_addr; 70 int dest_addr_len; 71 int is_connected; 72 73 /* Circular Buffer variables for use in UDP receive code */ 74 int circular_buffer_size; 75 AVFifoBuffer *fifo; 76 int circular_buffer_error; 77#if HAVE_PTHREAD_CANCEL 78 pthread_t circular_buffer_thread; 79 pthread_mutex_t mutex; 80 pthread_cond_t cond; 81 int thread_started; 82#endif 83 uint8_t tmp[UDP_MAX_PKT_SIZE+4]; 84 int remaining_in_dg; 85 char *local_addr; 86 int packet_size; 87 int timeout; 88 struct sockaddr_storage local_addr_storage; 89} UDPContext; 90 91#define OFFSET(x) offsetof(UDPContext, x) 92#define D AV_OPT_FLAG_DECODING_PARAM 93#define E AV_OPT_FLAG_ENCODING_PARAM 94static 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 }, 107{NULL} 108}; 109 110static const AVClass udp_context_class = { 111 .class_name = "udp", 112 .item_name = av_default_item_name, 113 .option = options, 114 .version = LIBAVUTIL_VERSION_INT, 115}; 116 117static void log_net_error(void *ctx, int level, const char* prefix) 118{ 119 char errbuf[100]; 120 av_strerror(ff_neterrno(), errbuf, sizeof(errbuf)); 121 av_log(ctx, level, "%s: %s\n", prefix, errbuf); 122} 123 124static int udp_set_multicast_ttl(int sockfd, int mcastTTL, 125 struct sockaddr *addr) 126{ 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)"); 131 return -1; 132 } 133 } 134#endif 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)"); 139 return -1; 140 } 141 } 142#endif 143 return 0; 144} 145 146static int udp_join_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr) 147{ 148#ifdef IP_ADD_MEMBERSHIP 149 if (addr->sa_family == AF_INET) { 150 struct ip_mreq mreq; 151 152 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr; 153 if (local_addr) 154 mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr; 155 else 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)"); 159 return -1; 160 } 161 } 162#endif 163#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6) 164 if (addr->sa_family == AF_INET6) { 165 struct ipv6_mreq mreq6; 166 167 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)"); 171 return -1; 172 } 173 } 174#endif 175 return 0; 176} 177 178static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr) 179{ 180#ifdef IP_DROP_MEMBERSHIP 181 if (addr->sa_family == AF_INET) { 182 struct ip_mreq mreq; 183 184 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr; 185 if (local_addr) 186 mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr; 187 else 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)"); 191 return -1; 192 } 193 } 194#endif 195#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6) 196 if (addr->sa_family == AF_INET6) { 197 struct ipv6_mreq mreq6; 198 199 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)"); 203 return -1; 204 } 205 } 206#endif 207 return 0; 208} 209 210static struct addrinfo* udp_resolve_host(const char *hostname, int port, 211 int type, int family, int flags) 212{ 213 struct addrinfo hints = { 0 }, *res = 0; 214 int error; 215 char sport[16]; 216 const char *node = 0, *service = "0"; 217 218 if (port > 0) { 219 snprintf(sport, sizeof(sport), "%d", port); 220 service = sport; 221 } 222 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) { 223 node = hostname; 224 } 225 hints.ai_socktype = type; 226 hints.ai_family = family; 227 hints.ai_flags = flags; 228 if ((error = getaddrinfo(node, service, &hints, &res))) { 229 res = NULL; 230 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error)); 231 } 232 233 return res; 234} 235 236static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr, 237 int addr_len, char **sources, 238 int nb_sources, int include) 239{ 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. */ 243 int i; 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, 249 0); 250 if (!sourceaddr) 251 return AVERROR(ENOENT); 252 253 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); 257 258 if (setsockopt(sockfd, level, 259 include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE, 260 (const void *)&mreqs, sizeof(mreqs)) < 0) { 261 if (include) 262 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)"); 263 else 264 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)"); 265 return ff_neterrno(); 266 } 267 } 268#elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE) 269 int i; 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); 274 } 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, 279 0); 280 if (!sourceaddr) 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", 285 sources[i]); 286 return AVERROR(EINVAL); 287 } 288 289 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); 293 294 if (setsockopt(sockfd, IPPROTO_IP, 295 include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE, 296 (const void *)&mreqs, sizeof(mreqs)) < 0) { 297 if (include) 298 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)"); 299 else 300 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)"); 301 return ff_neterrno(); 302 } 303 } 304#else 305 return AVERROR(ENOSYS); 306#endif 307 return 0; 308} 309static int udp_set_url(struct sockaddr_storage *addr, 310 const char *hostname, int port) 311{ 312 struct addrinfo *res0; 313 int addr_len; 314 315 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; 319 freeaddrinfo(res0); 320 321 return addr_len; 322} 323 324static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, 325 socklen_t *addr_len, const char *localaddr) 326{ 327 int udp_fd = -1; 328 struct addrinfo *res0 = NULL, *res = NULL; 329 int family = AF_UNSPEC; 330 331 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); 335 if (res0 == 0) 336 goto fail; 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"); 341 } 342 343 if (udp_fd < 0) 344 goto fail; 345 346 memcpy(addr, res->ai_addr, res->ai_addrlen); 347 *addr_len = res->ai_addrlen; 348 349 freeaddrinfo(res0); 350 351 return udp_fd; 352 353 fail: 354 if (udp_fd >= 0) 355 closesocket(udp_fd); 356 if(res0) 357 freeaddrinfo(res0); 358 return -1; 359} 360 361static int udp_port(struct sockaddr_storage *addr, int addr_len) 362{ 363 char sbuf[sizeof(int)*3+1]; 364 int error; 365 366 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)); 368 return -1; 369 } 370 371 return strtol(sbuf, NULL, 10); 372} 373 374 375/** 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. 379 * 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 386 * 387 * @param h media file context 388 * @param uri of the remote server 389 * @return zero if no error. 390 */ 391int ff_udp_set_remote_url(URLContext *h, const char *uri) 392{ 393 UDPContext *s = h->priv_data; 394 char hostname[256], buf[10]; 395 int port; 396 const char *p; 397 398 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri); 399 400 /* set the destination address */ 401 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port); 402 if (s->dest_addr_len < 0) { 403 return AVERROR(EIO); 404 } 405 s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr); 406 p = strchr(uri, '?'); 407 if (p) { 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, 413 s->dest_addr_len)) { 414 s->is_connected = 0; 415 log_net_error(h, AV_LOG_ERROR, "connect"); 416 return AVERROR(EIO); 417 } 418 } 419 } 420 } 421 422 return 0; 423} 424 425/** 426 * Return the local port used by the UDP connection 427 * @param h media file context 428 * @return the local port number 429 */ 430int ff_udp_get_local_port(URLContext *h) 431{ 432 UDPContext *s = h->priv_data; 433 return s->local_port; 434} 435 436/** 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 440 */ 441static int udp_get_file_handle(URLContext *h) 442{ 443 UDPContext *s = h->priv_data; 444 return s->udp_fd; 445} 446 447#if HAVE_PTHREAD_CANCEL 448static void *circular_buffer_task( void *_URLContext) 449{ 450 URLContext *h = _URLContext; 451 UDPContext *s = h->priv_data; 452 int old_cancelstate; 453 454 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); 459 goto end; 460 } 461 while(1) { 462 int len; 463 464 pthread_mutex_unlock(&s->mutex); 465 /* Blocking operations are always cancellation points; 466 see "General Information" / "Thread Cancelation Overview" 467 in Single Unix. */ 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); 472 if (len < 0) { 473 if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) { 474 s->circular_buffer_error = ff_neterrno(); 475 goto end; 476 } 477 continue; 478 } 479 AV_WL32(s->tmp, len); 480 481 if(av_fifo_space(s->fifo) < len + 4) { 482 /* No Space left */ 483 if (s->overrun_nonfatal) { 484 av_log(h, AV_LOG_WARNING, "Circular buffer overrun. " 485 "Surviving due to overrun_nonfatal option\n"); 486 continue; 487 } else { 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); 492 goto end; 493 } 494 } 495 av_fifo_generic_write(s->fifo, s->tmp, len+4, NULL); 496 pthread_cond_signal(&s->cond); 497 } 498 499end: 500 pthread_cond_signal(&s->cond); 501 pthread_mutex_unlock(&s->mutex); 502 return NULL; 503} 504#endif 505 506static int parse_source_list(char *buf, char **sources, int *num_sources, 507 int max_sources) 508{ 509 char *source_start; 510 511 source_start = buf; 512 while (1) { 513 char *next = strchr(source_start, ','); 514 if (next) 515 *next = '\0'; 516 sources[*num_sources] = av_strdup(source_start); 517 if (!sources[*num_sources]) 518 return AVERROR(ENOMEM); 519 source_start = next + 1; 520 (*num_sources)++; 521 if (*num_sources >= max_sources || !next) 522 break; 523 } 524 return 0; 525} 526 527/* put it in UDP context */ 528/* return non zero if error */ 529static int udp_open(URLContext *h, const char *uri, int flags) 530{ 531 char hostname[1024], localaddr[1024] = ""; 532 int port, udp_fd = -1, tmp, bind_ret = -1; 533 UDPContext *s = h->priv_data; 534 int is_output; 535 const char *p; 536 char buf[256]; 537 struct sockaddr_storage my_addr; 538 socklen_t len; 539 int reuse_specified = 0; 540 int i, num_include_sources = 0, num_exclude_sources = 0; 541 char *include_sources[32], *exclude_sources[32]; 542 543 h->is_streamed = 1; 544 545 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; 548 549 p = strchr(uri, '?'); 550 if (p) { 551 if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) { 552 char *endptr = NULL; 553 s->reuse_socket = strtol(buf, &endptr, 10); 554 /* assume if no digits were found it is a request to enable it */ 555 if (buf == endptr) 556 s->reuse_socket = 1; 557 reuse_specified = 1; 558 } 559 if (av_find_info_tag(buf, sizeof(buf), "overrun_nonfatal", p)) { 560 char *endptr = NULL; 561 s->overrun_nonfatal = strtol(buf, &endptr, 10); 562 /* assume if no digits were found it is a request to enable it */ 563 if (buf == endptr) 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"); 569 } 570 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) { 571 s->ttl = strtol(buf, NULL, 10); 572 } 573 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) { 574 s->local_port = strtol(buf, NULL, 10); 575 } 576 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) { 577 s->packet_size = strtol(buf, NULL, 10); 578 } 579 if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) { 580 s->buffer_size = strtol(buf, NULL, 10); 581 } 582 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) { 583 s->is_connected = strtol(buf, NULL, 10); 584 } 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"); 591 } 592 if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) { 593 av_strlcpy(localaddr, buf, sizeof(localaddr)); 594 } 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))) 598 goto fail; 599 } 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))) 603 goto fail; 604 } 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); 609 } 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; 614 } else { 615 h->max_packet_size = UDP_MAX_PKT_SIZE; 616 } 617 h->rw_timeout = s->timeout; 618 619 /* fill the dest addr */ 620 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri); 621 622 /* 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)) 626 goto fail; 627 } else { 628 if (ff_udp_set_remote_url(h, uri) < 0) 629 goto fail; 630 } 631 632 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); 635 if (udp_fd < 0) 636 goto fail; 637 638 s->local_addr_storage=my_addr; //store for future multicast join 639 640 /* Follow the requested reuse option, unless it's multicast in which 641 * case enable reuse unless explicitly disabled. 642 */ 643 if (s->reuse_socket || (s->is_multicast && !reuse_specified)) { 644 s->reuse_socket = 1; 645 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0) 646 goto fail; 647 } 648 649 if (s->is_broadcast) { 650#ifdef SO_BROADCAST 651 if (setsockopt (udp_fd, SOL_SOCKET, SO_BROADCAST, &(s->is_broadcast), sizeof(s->is_broadcast)) != 0) 652#endif 653 goto fail; 654 } 655 656 /* If multicast, try binding the multicast address first, to avoid 657 * receiving UDP packets from other sources aimed at the same UDP 658 * port. This fails on windows. This makes sending to the same address 659 * using sendto() fail, so only do it if we're opened in read-only mode. */ 660 if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) { 661 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len); 662 } 663 /* bind to the local address if not multicast or if the multicast 664 * bind failed */ 665 /* the bind is needed to give a port to the socket now */ 666 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) { 667 log_net_error(h, AV_LOG_ERROR, "bind failed"); 668 goto fail; 669 } 670 671 len = sizeof(my_addr); 672 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len); 673 s->local_port = udp_port(&my_addr, len); 674 675 if (s->is_multicast) { 676 if (h->flags & AVIO_FLAG_WRITE) { 677 /* output */ 678 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0) 679 goto fail; 680 } 681 if (h->flags & AVIO_FLAG_READ) { 682 /* input */ 683 if (num_include_sources && num_exclude_sources) { 684 av_log(h, AV_LOG_ERROR, "Simultaneously including and excluding multicast sources is not supported\n"); 685 goto fail; 686 } 687 if (num_include_sources) { 688 if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, include_sources, num_include_sources, 1) < 0) 689 goto fail; 690 } else { 691 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage) < 0) 692 goto fail; 693 } 694 if (num_exclude_sources) { 695 if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, exclude_sources, num_exclude_sources, 0) < 0) 696 goto fail; 697 } 698 } 699 } 700 701 if (is_output) { 702 /* limit the tx buf size to limit latency */ 703 tmp = s->buffer_size; 704 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) { 705 log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)"); 706 goto fail; 707 } 708 } else { 709 /* set udp recv buffer size to the requested value (default 64K) */ 710 tmp = s->buffer_size; 711 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) { 712 log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)"); 713 } 714 len = sizeof(tmp); 715 if (getsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, &len) < 0) { 716 log_net_error(h, AV_LOG_WARNING, "getsockopt(SO_RCVBUF)"); 717 } else { 718 av_log(h, AV_LOG_DEBUG, "end receive buffer size reported is %d\n", tmp); 719 if(tmp < s->buffer_size) 720 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 } 722 723 /* make the socket non-blocking */ 724 ff_socket_nonblock(udp_fd, 1); 725 } 726 if (s->is_connected) { 727 if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) { 728 log_net_error(h, AV_LOG_ERROR, "connect"); 729 goto fail; 730 } 731 } 732 733 for (i = 0; i < num_include_sources; i++) 734 av_freep(&include_sources[i]); 735 for (i = 0; i < num_exclude_sources; i++) 736 av_freep(&exclude_sources[i]); 737 738 s->udp_fd = udp_fd; 739 740#if HAVE_PTHREAD_CANCEL 741 if (!is_output && s->circular_buffer_size) { 742 int ret; 743 744 /* start the task going */ 745 s->fifo = av_fifo_alloc(s->circular_buffer_size); 746 ret = pthread_mutex_init(&s->mutex, NULL); 747 if (ret != 0) { 748 av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret)); 749 goto fail; 750 } 751 ret = pthread_cond_init(&s->cond, NULL); 752 if (ret != 0) { 753 av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret)); 754 goto cond_fail; 755 } 756 ret = pthread_create(&s->circular_buffer_thread, NULL, circular_buffer_task, h); 757 if (ret != 0) { 758 av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret)); 759 goto thread_fail; 760 } 761 s->thread_started = 1; 762 } 763#endif 764 765 return 0; 766#if HAVE_PTHREAD_CANCEL 767 thread_fail: 768 pthread_cond_destroy(&s->cond); 769 cond_fail: 770 pthread_mutex_destroy(&s->mutex); 771#endif 772 fail: 773 if (udp_fd >= 0) 774 closesocket(udp_fd); 775 av_fifo_freep(&s->fifo); 776 for (i = 0; i < num_include_sources; i++) 777 av_freep(&include_sources[i]); 778 for (i = 0; i < num_exclude_sources; i++) 779 av_freep(&exclude_sources[i]); 780 return AVERROR(EIO); 781} 782 783static int udp_read(URLContext *h, uint8_t *buf, int size) 784{ 785 UDPContext *s = h->priv_data; 786 int ret; 787 int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK; 788 789#if HAVE_PTHREAD_CANCEL 790 if (s->fifo) { 791 pthread_mutex_lock(&s->mutex); 792 do { 793 avail = av_fifo_size(s->fifo); 794 if (avail) { // >=size) { 795 uint8_t tmp[4]; 796 797 av_fifo_generic_read(s->fifo, tmp, 4, NULL); 798 avail= AV_RL32(tmp); 799 if(avail > size){ 800 av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n"); 801 avail= size; 802 } 803 804 av_fifo_generic_read(s->fifo, buf, avail, NULL); 805 av_fifo_drain(s->fifo, AV_RL32(tmp) - avail); 806 pthread_mutex_unlock(&s->mutex); 807 return avail; 808 } else if(s->circular_buffer_error){ 809 int err = s->circular_buffer_error; 810 pthread_mutex_unlock(&s->mutex); 811 return err; 812 } else if(nonblock) { 813 pthread_mutex_unlock(&s->mutex); 814 return AVERROR(EAGAIN); 815 } 816 else { 817 /* FIXME: using the monotonic clock would be better, 818 but it does not exist on all supported platforms. */ 819 int64_t t = av_gettime() + 100000; 820 struct timespec tv = { .tv_sec = t / 1000000, 821 .tv_nsec = (t % 1000000) * 1000 }; 822 if (pthread_cond_timedwait(&s->cond, &s->mutex, &tv) < 0) { 823 pthread_mutex_unlock(&s->mutex); 824 return AVERROR(errno == ETIMEDOUT ? EAGAIN : errno); 825 } 826 nonblock = 1; 827 } 828 } while( 1); 829 } 830#endif 831 832 if (!(h->flags & AVIO_FLAG_NONBLOCK)) { 833 ret = ff_network_wait_fd(s->udp_fd, 0); 834 if (ret < 0) 835 return ret; 836 } 837 ret = recv(s->udp_fd, buf, size, 0); 838 839 return ret < 0 ? ff_neterrno() : ret; 840} 841 842static int udp_write(URLContext *h, const uint8_t *buf, int size) 843{ 844 UDPContext *s = h->priv_data; 845 int ret; 846 847 if (!(h->flags & AVIO_FLAG_NONBLOCK)) { 848 ret = ff_network_wait_fd(s->udp_fd, 1); 849 if (ret < 0) 850 return ret; 851 } 852 853 if (!s->is_connected) { 854 ret = sendto (s->udp_fd, buf, size, 0, 855 (struct sockaddr *) &s->dest_addr, 856 s->dest_addr_len); 857 } else 858 ret = send(s->udp_fd, buf, size, 0); 859 860 return ret < 0 ? ff_neterrno() : ret; 861} 862 863static int udp_close(URLContext *h) 864{ 865 UDPContext *s = h->priv_data; 866 int ret; 867 868 if (s->is_multicast && (h->flags & AVIO_FLAG_READ)) 869 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage); 870 closesocket(s->udp_fd); 871#if HAVE_PTHREAD_CANCEL 872 if (s->thread_started) { 873 pthread_cancel(s->circular_buffer_thread); 874 ret = pthread_join(s->circular_buffer_thread, NULL); 875 if (ret != 0) 876 av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret)); 877 pthread_mutex_destroy(&s->mutex); 878 pthread_cond_destroy(&s->cond); 879 } 880#endif 881 av_fifo_freep(&s->fifo); 882 return 0; 883} 884 885URLProtocol ff_udp_protocol = { 886 .name = "udp", 887 .url_open = udp_open, 888 .url_read = udp_read, 889 .url_write = udp_write, 890 .url_close = udp_close, 891 .url_get_file_handle = udp_get_file_handle, 892 .priv_data_size = sizeof(UDPContext), 893 .priv_data_class = &udp_context_class, 894 .flags = URL_PROTOCOL_FLAG_NETWORK, 895}; 896