libavformat/udp.c

   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 _DEFAULT_SOURCE
  28 #define _BSD_SOURCE     /* Needed for using struct ip_mreq with recent glibc */
  29
  30 #include "avformat.h"
  31 #include "avio_internal.h"
  32 #include "libavutil/avassert.h"
  33 #include "libavutil/parseutils.h"
  34 #include "libavutil/fifo.h"
  35 #include "libavutil/intreadwrite.h"
  36 #include "libavutil/avstring.h"
  37 #include "libavutil/opt.h"
  38 #include "libavutil/log.h"
  39 #include "libavutil/time.h"
  40 #include "internal.h"
  41 #include "network.h"
  42 #include "os_support.h"
  43 #include "url.h"
  44 #include "ip.h"
  45
  46 #ifdef __APPLE__
  47 #include "TargetConditionals.h"
  48 #endif
  49
  50 #if HAVE_UDPLITE_H
  51 #include "udplite.h"
  52 #else
  53 /* On many Linux systems, udplite.h is missing but the kernel supports UDP-Lite.
  54  * So, we provide a fallback here.
  55  */
  56 #define UDPLITE_SEND_CSCOV                               10
  57 #define UDPLITE_RECV_CSCOV                               11
  58 #endif
  59
  60 #ifndef IPPROTO_UDPLITE
  61 #define IPPROTO_UDPLITE                                  136
  62 #endif
  63
  64 #if HAVE_W32THREADS
  65 #undef HAVE_PTHREAD_CANCEL
  66 #define HAVE_PTHREAD_CANCEL 1
  67 #endif
  68
  69 #if HAVE_PTHREAD_CANCEL
  70 #include "libavutil/thread.h"
  71 #endif
  72
  73 #ifndef IPV6_ADD_MEMBERSHIP
  74 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
  75 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
  76 #endif
  77
  78 #define UDP_TX_BUF_SIZE 32768
  79 #define UDP_RX_BUF_SIZE 393216
  80 #define UDP_MAX_PKT_SIZE 65536
  81 #define UDP_HEADER_SIZE 8
  82
  83 typedef struct UDPContext {
  84     const AVClass *class;
  85     int udp_fd;
  86     int ttl;
  87     int udplite_coverage;
  88     int buffer_size;
  89     int pkt_size;
  90     int is_multicast;
  91     int is_broadcast;
  92     int local_port;
  93     int reuse_socket;
  94     int overrun_nonfatal;
  95     struct sockaddr_storage dest_addr;
  96     int dest_addr_len;
  97     int is_connected;
  98
  99     /* Circular Buffer variables for use in UDP receive code */
 100     int circular_buffer_size;
 101     AVFifoBuffer *fifo;
 102     int circular_buffer_error;
 103     int64_t bitrate; /* number of bits to send per second */
 104     int64_t burst_bits;
 105     int close_req;
 106 #if HAVE_PTHREAD_CANCEL
 107     pthread_t circular_buffer_thread;
 108     pthread_mutex_t mutex;
 109     pthread_cond_t cond;
 110     int thread_started;
 111 #endif
 112     uint8_t tmp[UDP_MAX_PKT_SIZE+4];
 113     int remaining_in_dg;
 114     char *localaddr;
 115     int timeout;
 116     struct sockaddr_storage local_addr_storage;
 117     char *sources;
 118     char *block;
 119     IPSourceFilters filters;
 120 } UDPContext;
 121
 122 #define OFFSET(x) offsetof(UDPContext, x)
 123 #define D AV_OPT_FLAG_DECODING_PARAM
 124 #define E AV_OPT_FLAG_ENCODING_PARAM
 125 static const AVOption options[] = {
 126     { "buffer_size",    "System data size (in bytes)",                     OFFSET(buffer_size),    AV_OPT_TYPE_INT,    { .i64 = -1 },    -1, INT_MAX, .flags = D|E },
 127     { "bitrate",        "Bits to send per second",                         OFFSET(bitrate),        AV_OPT_TYPE_INT64,  { .i64 = 0  },     0, INT64_MAX, .flags = E },
 128     { "burst_bits",     "Max length of bursts in bits (when using bitrate)", OFFSET(burst_bits),   AV_OPT_TYPE_INT64,  { .i64 = 0  },     0, INT64_MAX, .flags = E },
 129     { "localport",      "Local port",                                      OFFSET(local_port),     AV_OPT_TYPE_INT,    { .i64 = -1 },    -1, INT_MAX, D|E },
 130     { "local_port",     "Local port",                                      OFFSET(local_port),     AV_OPT_TYPE_INT,    { .i64 = -1 },    -1, INT_MAX, .flags = D|E },
 131     { "localaddr",      "Local address",                                   OFFSET(localaddr),      AV_OPT_TYPE_STRING, { .str = NULL },               .flags = D|E },
 132     { "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 },
 133     { "pkt_size",       "Maximum UDP packet size",                         OFFSET(pkt_size),       AV_OPT_TYPE_INT,    { .i64 = 1472 },  -1, INT_MAX, .flags = D|E },
 134     { "reuse",          "explicitly allow reusing UDP sockets",            OFFSET(reuse_socket),   AV_OPT_TYPE_BOOL,   { .i64 = -1 },    -1, 1,       D|E },
 135     { "reuse_socket",   "explicitly allow reusing UDP sockets",            OFFSET(reuse_socket),   AV_OPT_TYPE_BOOL,   { .i64 = -1 },    -1, 1,       .flags = D|E },
 136     { "broadcast", "explicitly allow or disallow broadcast destination",   OFFSET(is_broadcast),   AV_OPT_TYPE_BOOL,   { .i64 = 0  },     0, 1,       E },
 137     { "ttl",            "Time to live (multicast only)",                   OFFSET(ttl),            AV_OPT_TYPE_INT,    { .i64 = 16 },     0, INT_MAX, E },
 138     { "connect",        "set if connect() should be called on socket",     OFFSET(is_connected),   AV_OPT_TYPE_BOOL,   { .i64 =  0 },     0, 1,       .flags = D|E },
 139     { "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 },
 140     { "overrun_nonfatal", "survive in case of UDP receiving circular buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1,    D },
 141     { "timeout",        "set raise error timeout (only in read mode)",     OFFSET(timeout),        AV_OPT_TYPE_INT,    { .i64 = 0 },      0, INT_MAX, D },
 142     { "sources",        "Source list",                                     OFFSET(sources),        AV_OPT_TYPE_STRING, { .str = NULL },               .flags = D|E },
 143     { "block",          "Block list",                                      OFFSET(block),          AV_OPT_TYPE_STRING, { .str = NULL },               .flags = D|E },
 144     { NULL }
 145 };
 146
 147 static const AVClass udp_class = {
 148     .class_name = "udp",
 149     .item_name  = av_default_item_name,
 150     .option     = options,
 151     .version    = LIBAVUTIL_VERSION_INT,
 152 };
 153
 154 static const AVClass udplite_context_class = {
 155     .class_name     = "udplite",
 156     .item_name      = av_default_item_name,
 157     .option         = options,
 158     .version        = LIBAVUTIL_VERSION_INT,
 159 };
 160
 161 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
 162                                  struct sockaddr *addr)
 163 {
 164 #ifdef IP_MULTICAST_TTL
 165     if (addr->sa_family == AF_INET) {
 166         if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
 167             ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
 168             return -1;
 169         }
 170     }
 171 #endif
 172 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
 173     if (addr->sa_family == AF_INET6) {
 174         if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
 175             ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
 176             return -1;
 177         }
 178     }
 179 #endif
 180     return 0;
 181 }
 182
 183 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
 184 {
 185 #ifdef IP_ADD_MEMBERSHIP
 186     if (addr->sa_family == AF_INET) {
 187         struct ip_mreq mreq;
 188
 189         mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
 190         if (local_addr)
 191             mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
 192         else
 193             mreq.imr_interface.s_addr= INADDR_ANY;
 194         if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
 195             ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
 196             return -1;
 197         }
 198     }
 199 #endif
 200 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
 201     if (addr->sa_family == AF_INET6) {
 202         struct ipv6_mreq mreq6;
 203
 204         memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
 205         //TODO: Interface index should be looked up from local_addr
 206         mreq6.ipv6mr_interface= 0;
 207         if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
 208             ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
 209             return -1;
 210         }
 211     }
 212 #endif
 213     return 0;
 214 }
 215
 216 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr,struct sockaddr *local_addr)
 217 {
 218 #ifdef IP_DROP_MEMBERSHIP
 219     if (addr->sa_family == AF_INET) {
 220         struct ip_mreq mreq;
 221
 222         mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
 223         if (local_addr)
 224             mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
 225         else
 226             mreq.imr_interface.s_addr= INADDR_ANY;
 227         if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
 228             ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
 229             return -1;
 230         }
 231     }
 232 #endif
 233 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
 234     if (addr->sa_family == AF_INET6) {
 235         struct ipv6_mreq mreq6;
 236
 237         memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
 238         //TODO: Interface index should be looked up from local_addr
 239         mreq6.ipv6mr_interface= 0;
 240         if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
 241             ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
 242             return -1;
 243         }
 244     }
 245 #endif
 246     return 0;
 247 }
 248
 249 static int udp_set_multicast_sources(URLContext *h,
 250                                      int sockfd, struct sockaddr *addr,
 251                                      int addr_len, struct sockaddr_storage *local_addr,
 252                                      struct sockaddr_storage *sources,
 253                                      int nb_sources, int include)
 254 {
 255     int i;
 256     if (addr->sa_family != AF_INET) {
 257 #if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE)
 258         /* For IPv4 prefer the old approach, as that alone works reliably on
 259          * Windows and it also supports supplying the interface based on its
 260          * address. */
 261         int i;
 262         for (i = 0; i < nb_sources; i++) {
 263             struct group_source_req mreqs;
 264             int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
 265
 266             //TODO: Interface index should be looked up from local_addr
 267             mreqs.gsr_interface = 0;
 268             memcpy(&mreqs.gsr_group, addr, addr_len);
 269             memcpy(&mreqs.gsr_source, &sources[i], sizeof(*sources));
 270
 271             if (setsockopt(sockfd, level,
 272                            include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
 273                            (const void *)&mreqs, sizeof(mreqs)) < 0) {
 274                 if (include)
 275                     ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
 276                 else
 277                     ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
 278                 return ff_neterrno();
 279             }
 280         }
 281         return 0;
 282 #else
 283         av_log(h, AV_LOG_ERROR,
 284                "Setting multicast sources only supported for IPv4\n");
 285         return AVERROR(EINVAL);
 286 #endif
 287     }
 288 #if HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
 289     for (i = 0; i < nb_sources; i++) {
 290         struct ip_mreq_source mreqs;
 291         if (sources[i].ss_family != AF_INET) {
 292             av_log(h, AV_LOG_ERROR, "Source/block address %d is of incorrect protocol family\n", i + 1);
 293             return AVERROR(EINVAL);
 294         }
 295
 296         mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
 297         if (local_addr)
 298             mreqs.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
 299         else
 300             mreqs.imr_interface.s_addr= INADDR_ANY;
 301         mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)&sources[i])->sin_addr.s_addr;
 302
 303         if (setsockopt(sockfd, IPPROTO_IP,
 304                        include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
 305                        (const void *)&mreqs, sizeof(mreqs)) < 0) {
 306             if (include)
 307                 ff_log_net_error(h, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
 308             else
 309                 ff_log_net_error(h, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
 310             return ff_neterrno();
 311         }
 312     }
 313 #else
 314     return AVERROR(ENOSYS);
 315 #endif
 316     return 0;
 317 }
 318 static int udp_set_url(URLContext *h,
 319                        struct sockaddr_storage *addr,
 320                        const char *hostname, int port)
 321 {
 322     struct addrinfo *res0;
 323     int addr_len;
 324
 325     res0 = ff_ip_resolve_host(h, hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
 326     if (!res0) return AVERROR(EIO);
 327     memcpy(addr, res0->ai_addr, res0->ai_addrlen);
 328     addr_len = res0->ai_addrlen;
 329     freeaddrinfo(res0);
 330
 331     return addr_len;
 332 }
 333
 334 static int udp_socket_create(URLContext *h, struct sockaddr_storage *addr,
 335                              socklen_t *addr_len, const char *localaddr)
 336 {
 337     UDPContext *s = h->priv_data;
 338     int udp_fd = -1;
 339     struct addrinfo *res0, *res;
 340     int family = AF_UNSPEC;
 341
 342     if (((struct sockaddr *) &s->dest_addr)->sa_family)
 343         family = ((struct sockaddr *) &s->dest_addr)->sa_family;
 344     res0 = ff_ip_resolve_host(h, (localaddr && localaddr[0]) ? localaddr : NULL,
 345                             s->local_port,
 346                             SOCK_DGRAM, family, AI_PASSIVE);
 347     if (!res0)
 348         goto fail;
 349     for (res = res0; res; res=res->ai_next) {
 350         if (s->udplite_coverage)
 351             udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, IPPROTO_UDPLITE);
 352         else
 353             udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, 0);
 354         if (udp_fd != -1) break;
 355         ff_log_net_error(NULL, AV_LOG_ERROR, "socket");
 356     }
 357
 358     if (udp_fd < 0)
 359         goto fail;
 360
 361     memcpy(addr, res->ai_addr, res->ai_addrlen);
 362     *addr_len = res->ai_addrlen;
 363
 364     freeaddrinfo(res0);
 365
 366     return udp_fd;
 367
 368  fail:
 369     if (udp_fd >= 0)
 370         closesocket(udp_fd);
 371     if(res0)
 372         freeaddrinfo(res0);
 373     return -1;
 374 }
 375
 376 static int udp_port(struct sockaddr_storage *addr, int addr_len)
 377 {
 378     char sbuf[sizeof(int)*3+1];
 379     int error;
 380
 381     if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0,  sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
 382         av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
 383         return -1;
 384     }
 385
 386     return strtol(sbuf, NULL, 10);
 387 }
 388
 389
 390 /**
 391  * If no filename is given to av_open_input_file because you want to
 392  * get the local port first, then you must call this function to set
 393  * the remote server address.
 394  *
 395  * url syntax: udp://host:port[?option=val...]
 396  * option: 'ttl=n'       : set the ttl value (for multicast only)
 397  *         'localport=n' : set the local port
 398  *         'pkt_size=n'  : set max packet size
 399  *         'reuse=1'     : enable reusing the socket
 400  *         'overrun_nonfatal=1': survive in case of circular buffer overrun
 401  *
 402  * @param h media file context
 403  * @param uri of the remote server
 404  * @return zero if no error.
 405  */
 406 int ff_udp_set_remote_url(URLContext *h, const char *uri)
 407 {
 408     UDPContext *s = h->priv_data;
 409     char hostname[256], buf[10];
 410     int port;
 411     const char *p;
 412
 413     av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
 414
 415     /* set the destination address */
 416     s->dest_addr_len = udp_set_url(h, &s->dest_addr, hostname, port);
 417     if (s->dest_addr_len < 0) {
 418         return AVERROR(EIO);
 419     }
 420     s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
 421     p = strchr(uri, '?');
 422     if (p) {
 423         if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
 424             int was_connected = s->is_connected;
 425             s->is_connected = strtol(buf, NULL, 10);
 426             if (s->is_connected && !was_connected) {
 427                 if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
 428                             s->dest_addr_len)) {
 429                     s->is_connected = 0;
 430                     ff_log_net_error(h, AV_LOG_ERROR, "connect");
 431                     return AVERROR(EIO);
 432                 }
 433             }
 434         }
 435     }
 436
 437     return 0;
 438 }
 439
 440 /**
 441  * Return the local port used by the UDP connection
 442  * @param h media file context
 443  * @return the local port number
 444  */
 445 int ff_udp_get_local_port(URLContext *h)
 446 {
 447     UDPContext *s = h->priv_data;
 448     return s->local_port;
 449 }
 450
 451 /**
 452  * Return the udp file handle for select() usage to wait for several RTP
 453  * streams at the same time.
 454  * @param h media file context
 455  */
 456 static int udp_get_file_handle(URLContext *h)
 457 {
 458     UDPContext *s = h->priv_data;
 459     return s->udp_fd;
 460 }
 461
 462 #if HAVE_PTHREAD_CANCEL
 463 static void *circular_buffer_task_rx( void *_URLContext)
 464 {
 465     URLContext *h = _URLContext;
 466     UDPContext *s = h->priv_data;
 467     int old_cancelstate;
 468
 469     pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
 470     pthread_mutex_lock(&s->mutex);
 471     if (ff_socket_nonblock(s->udp_fd, 0) < 0) {
 472         av_log(h, AV_LOG_ERROR, "Failed to set blocking mode");
 473         s->circular_buffer_error = AVERROR(EIO);
 474         goto end;
 475     }
 476     while(1) {
 477         int len;
 478         struct sockaddr_storage addr;
 479         socklen_t addr_len = sizeof(addr);
 480
 481         pthread_mutex_unlock(&s->mutex);
 482         /* Blocking operations are always cancellation points;
 483            see "General Information" / "Thread Cancelation Overview"
 484            in Single Unix. */
 485         pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
 486         len = recvfrom(s->udp_fd, s->tmp+4, sizeof(s->tmp)-4, 0, (struct sockaddr *)&addr, &addr_len);
 487         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
 488         pthread_mutex_lock(&s->mutex);
 489         if (len < 0) {
 490             if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) {
 491                 s->circular_buffer_error = ff_neterrno();
 492                 goto end;
 493             }
 494             continue;
 495         }
 496         if (ff_ip_check_source_lists(&addr, &s->filters))
 497             continue;
 498         AV_WL32(s->tmp, len);
 499
 500         if(av_fifo_space(s->fifo) < len + 4) {
 501             /* No Space left */
 502             if (s->overrun_nonfatal) {
 503                 av_log(h, AV_LOG_WARNING, "Circular buffer overrun. "
 504                         "Surviving due to overrun_nonfatal option\n");
 505                 continue;
 506             } else {
 507                 av_log(h, AV_LOG_ERROR, "Circular buffer overrun. "
 508                         "To avoid, increase fifo_size URL option. "
 509                         "To survive in such case, use overrun_nonfatal option\n");
 510                 s->circular_buffer_error = AVERROR(EIO);
 511                 goto end;
 512             }
 513         }
 514         av_fifo_generic_write(s->fifo, s->tmp, len+4, NULL);
 515         pthread_cond_signal(&s->cond);
 516     }
 517
 518 end:
 519     pthread_cond_signal(&s->cond);
 520     pthread_mutex_unlock(&s->mutex);
 521     return NULL;
 522 }
 523
 524 static void *circular_buffer_task_tx( void *_URLContext)
 525 {
 526     URLContext *h = _URLContext;
 527     UDPContext *s = h->priv_data;
 528     int64_t target_timestamp = av_gettime_relative();
 529     int64_t start_timestamp = av_gettime_relative();
 530     int64_t sent_bits = 0;
 531     int64_t burst_interval = s->bitrate ? (s->burst_bits * 1000000 / s->bitrate) : 0;
 532     int64_t max_delay = s->bitrate ?  ((int64_t)h->max_packet_size * 8 * 1000000 / s->bitrate + 1) : 0;
 533
 534     pthread_mutex_lock(&s->mutex);
 535
 536     if (ff_socket_nonblock(s->udp_fd, 0) < 0) {
 537         av_log(h, AV_LOG_ERROR, "Failed to set blocking mode");
 538         s->circular_buffer_error = AVERROR(EIO);
 539         goto end;
 540     }
 541
 542     for(;;) {
 543         int len;
 544         const uint8_t *p;
 545         uint8_t tmp[4];
 546         int64_t timestamp;
 547
 548         len=av_fifo_size(s->fifo);
 549
 550         while (len<4) {
 551             if (s->close_req)
 552                 goto end;
 553             if (pthread_cond_wait(&s->cond, &s->mutex) < 0) {
 554                 goto end;
 555             }
 556             len=av_fifo_size(s->fifo);
 557         }
 558
 559         av_fifo_generic_read(s->fifo, tmp, 4, NULL);
 560         len=AV_RL32(tmp);
 561
 562         av_assert0(len >= 0);
 563         av_assert0(len <= sizeof(s->tmp));
 564
 565         av_fifo_generic_read(s->fifo, s->tmp, len, NULL);
 566
 567         pthread_mutex_unlock(&s->mutex);
 568
 569         if (s->bitrate) {
 570             timestamp = av_gettime_relative();
 571             if (timestamp < target_timestamp) {
 572                 int64_t delay = target_timestamp - timestamp;
 573                 if (delay > max_delay) {
 574                     delay = max_delay;
 575                     start_timestamp = timestamp + delay;
 576                     sent_bits = 0;
 577                 }
 578                 av_usleep(delay);
 579             } else {
 580                 if (timestamp - burst_interval > target_timestamp) {
 581                     start_timestamp = timestamp - burst_interval;
 582                     sent_bits = 0;
 583                 }
 584             }
 585             sent_bits += len * 8;
 586             target_timestamp = start_timestamp + sent_bits * 1000000 / s->bitrate;
 587         }
 588
 589         p = s->tmp;
 590         while (len) {
 591             int ret;
 592             av_assert0(len > 0);
 593             if (!s->is_connected) {
 594                 ret = sendto (s->udp_fd, p, len, 0,
 595                             (struct sockaddr *) &s->dest_addr,
 596                             s->dest_addr_len);
 597             } else
 598                 ret = send(s->udp_fd, p, len, 0);
 599             if (ret >= 0) {
 600                 len -= ret;
 601                 p   += ret;
 602             } else {
 603                 ret = ff_neterrno();
 604                 if (ret != AVERROR(EAGAIN) && ret != AVERROR(EINTR)) {
 605                     pthread_mutex_lock(&s->mutex);
 606                     s->circular_buffer_error = ret;
 607                     pthread_mutex_unlock(&s->mutex);
 608                     return NULL;
 609                 }
 610             }
 611         }
 612
 613         pthread_mutex_lock(&s->mutex);
 614     }
 615
 616 end:
 617     pthread_mutex_unlock(&s->mutex);
 618     return NULL;
 619 }
 620
 621
 622 #endif
 623
 624 /* put it in UDP context */
 625 /* return non zero if error */
 626 static int udp_open(URLContext *h, const char *uri, int flags)
 627 {
 628     char hostname[1024], localaddr[1024] = "";
 629     int port, udp_fd = -1, tmp, bind_ret = -1, dscp = -1;
 630     UDPContext *s = h->priv_data;
 631     int is_output;
 632     const char *p;
 633     char buf[256];
 634     struct sockaddr_storage my_addr;
 635     socklen_t len;
 636
 637     h->is_streamed = 1;
 638
 639     is_output = !(flags & AVIO_FLAG_READ);
 640     if (s->buffer_size < 0)
 641         s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_RX_BUF_SIZE;
 642
 643     if (s->sources) {
 644         if (ff_ip_parse_sources(h, s->sources, &s->filters) < 0)
 645             goto fail;
 646     }
 647
 648     if (s->block) {
 649         if (ff_ip_parse_blocks(h, s->block, &s->filters) < 0)
 650             goto fail;
 651     }
 652
 653     if (s->pkt_size > 0)
 654         h->max_packet_size = s->pkt_size;
 655
 656     p = strchr(uri, '?');
 657     if (p) {
 658         if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
 659             char *endptr = NULL;
 660             s->reuse_socket = strtol(buf, &endptr, 10);
 661             /* assume if no digits were found it is a request to enable it */
 662             if (buf == endptr)
 663                 s->reuse_socket = 1;
 664         }
 665         if (av_find_info_tag(buf, sizeof(buf), "overrun_nonfatal", p)) {
 666             char *endptr = NULL;
 667             s->overrun_nonfatal = strtol(buf, &endptr, 10);
 668             /* assume if no digits were found it is a request to enable it */
 669             if (buf == endptr)
 670                 s->overrun_nonfatal = 1;
 671             if (!HAVE_PTHREAD_CANCEL)
 672                 av_log(h, AV_LOG_WARNING,
 673                        "'overrun_nonfatal' option was set but it is not supported "
 674                        "on this build (pthread support is required)\n");
 675         }
 676         if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
 677             s->ttl = strtol(buf, NULL, 10);
 678         }
 679         if (av_find_info_tag(buf, sizeof(buf), "udplite_coverage", p)) {
 680             s->udplite_coverage = strtol(buf, NULL, 10);
 681         }
 682         if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
 683             s->local_port = strtol(buf, NULL, 10);
 684         }
 685         if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
 686             s->pkt_size = strtol(buf, NULL, 10);
 687         }
 688         if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
 689             s->buffer_size = strtol(buf, NULL, 10);
 690         }
 691         if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
 692             s->is_connected = strtol(buf, NULL, 10);
 693         }
 694         if (av_find_info_tag(buf, sizeof(buf), "dscp", p)) {
 695             dscp = strtol(buf, NULL, 10);
 696         }
 697         if (av_find_info_tag(buf, sizeof(buf), "fifo_size", p)) {
 698             s->circular_buffer_size = strtol(buf, NULL, 10);
 699             if (!HAVE_PTHREAD_CANCEL)
 700                 av_log(h, AV_LOG_WARNING,
 701                        "'circular_buffer_size' option was set but it is not supported "
 702                        "on this build (pthread support is required)\n");
 703         }
 704         if (av_find_info_tag(buf, sizeof(buf), "bitrate", p)) {
 705             s->bitrate = strtoll(buf, NULL, 10);
 706             if (!HAVE_PTHREAD_CANCEL)
 707                 av_log(h, AV_LOG_WARNING,
 708                        "'bitrate' option was set but it is not supported "
 709                        "on this build (pthread support is required)\n");
 710         }
 711         if (av_find_info_tag(buf, sizeof(buf), "burst_bits", p)) {
 712             s->burst_bits = strtoll(buf, NULL, 10);
 713         }
 714         if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
 715             av_strlcpy(localaddr, buf, sizeof(localaddr));
 716         }
 717         if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
 718             if (ff_ip_parse_sources(h, buf, &s->filters) < 0)
 719                 goto fail;
 720         }
 721         if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
 722             if (ff_ip_parse_blocks(h, buf, &s->filters) < 0)
 723                 goto fail;
 724         }
 725         if (!is_output && av_find_info_tag(buf, sizeof(buf), "timeout", p))
 726             s->timeout = strtol(buf, NULL, 10);
 727         if (is_output && av_find_info_tag(buf, sizeof(buf), "broadcast", p))
 728             s->is_broadcast = strtol(buf, NULL, 10);
 729     }
 730     /* handling needed to support options picking from both AVOption and URL */
 731     s->circular_buffer_size *= 188;
 732     if (flags & AVIO_FLAG_WRITE) {
 733         h->max_packet_size = s->pkt_size;
 734     } else {
 735         h->max_packet_size = UDP_MAX_PKT_SIZE;
 736     }
 737     h->rw_timeout = s->timeout;
 738
 739     /* fill the dest addr */
 740     av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
 741
 742     /* XXX: fix av_url_split */
 743     if (hostname[0] == '\0' || hostname[0] == '?') {
 744         /* only accepts null hostname if input */
 745         if (!(flags & AVIO_FLAG_READ))
 746             goto fail;
 747     } else {
 748         if (ff_udp_set_remote_url(h, uri) < 0)
 749             goto fail;
 750     }
 751
 752     if ((s->is_multicast || s->local_port <= 0) && (h->flags & AVIO_FLAG_READ))
 753         s->local_port = port;
 754
 755     if (localaddr[0])
 756         udp_fd = udp_socket_create(h, &my_addr, &len, localaddr);
 757     else
 758         udp_fd = udp_socket_create(h, &my_addr, &len, s->localaddr);
 759     if (udp_fd < 0)
 760         goto fail;
 761
 762     s->local_addr_storage=my_addr; //store for future multicast join
 763
 764     /* Follow the requested reuse option, unless it's multicast in which
 765      * case enable reuse unless explicitly disabled.
 766      */
 767     if (s->reuse_socket > 0 || (s->is_multicast && s->reuse_socket < 0)) {
 768         s->reuse_socket = 1;
 769         if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
 770             goto fail;
 771     }
 772
 773     if (s->is_broadcast) {
 774 #ifdef SO_BROADCAST
 775         if (setsockopt (udp_fd, SOL_SOCKET, SO_BROADCAST, &(s->is_broadcast), sizeof(s->is_broadcast)) != 0)
 776 #endif
 777            goto fail;
 778     }
 779
 780     /* Set the checksum coverage for UDP-Lite (RFC 3828) for sending and receiving.
 781      * The receiver coverage has to be less than or equal to the sender coverage.
 782      * Otherwise, the receiver will drop all packets.
 783      */
 784     if (s->udplite_coverage) {
 785         if (setsockopt (udp_fd, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV, &(s->udplite_coverage), sizeof(s->udplite_coverage)) != 0)
 786             av_log(h, AV_LOG_WARNING, "socket option UDPLITE_SEND_CSCOV not available");
 787
 788         if (setsockopt (udp_fd, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV, &(s->udplite_coverage), sizeof(s->udplite_coverage)) != 0)
 789             av_log(h, AV_LOG_WARNING, "socket option UDPLITE_RECV_CSCOV not available");
 790     }
 791
 792     if (dscp >= 0) {
 793         dscp <<= 2;
 794         if (setsockopt (udp_fd, IPPROTO_IP, IP_TOS, &dscp, sizeof(dscp)) != 0)
 795             goto fail;
 796     }
 797
 798     /* If multicast, try binding the multicast address first, to avoid
 799      * receiving UDP packets from other sources aimed at the same UDP
 800      * port. This fails on windows. This makes sending to the same address
 801      * using sendto() fail, so only do it if we're opened in read-only mode. */
 802     if (s->is_multicast && (h->flags & AVIO_FLAG_READ)) {
 803         bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
 804     }
 805     /* bind to the local address if not multicast or if the multicast
 806      * bind failed */
 807     /* the bind is needed to give a port to the socket now */
 808     if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
 809         ff_log_net_error(h, AV_LOG_ERROR, "bind failed");
 810         goto fail;
 811     }
 812
 813     len = sizeof(my_addr);
 814     getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
 815     s->local_port = udp_port(&my_addr, len);
 816
 817     if (s->is_multicast) {
 818         if (h->flags & AVIO_FLAG_WRITE) {
 819             /* output */
 820             if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
 821                 goto fail;
 822         }
 823         if (h->flags & AVIO_FLAG_READ) {
 824             /* input */
 825             if (s->filters.nb_include_addrs) {
 826                 if (udp_set_multicast_sources(h, udp_fd,
 827                                               (struct sockaddr *)&s->dest_addr,
 828                                               s->dest_addr_len, &s->local_addr_storage,
 829                                               s->filters.include_addrs,
 830                                               s->filters.nb_include_addrs, 1) < 0)
 831                     goto fail;
 832             } else {
 833                 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage) < 0)
 834                     goto fail;
 835             }
 836             if (s->filters.nb_exclude_addrs) {
 837                 if (udp_set_multicast_sources(h, udp_fd,
 838                                               (struct sockaddr *)&s->dest_addr,
 839                                               s->dest_addr_len, &s->local_addr_storage,
 840                                               s->filters.exclude_addrs,
 841                                               s->filters.nb_exclude_addrs, 0) < 0)
 842                     goto fail;
 843             }
 844         }
 845     }
 846
 847     if (is_output) {
 848         /* limit the tx buf size to limit latency */
 849         tmp = s->buffer_size;
 850         if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
 851             ff_log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
 852             goto fail;
 853         }
 854     } else {
 855         /* set udp recv buffer size to the requested value (default 64K) */
 856         tmp = s->buffer_size;
 857         if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
 858             ff_log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
 859         }
 860         len = sizeof(tmp);
 861         if (getsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, &len) < 0) {
 862             ff_log_net_error(h, AV_LOG_WARNING, "getsockopt(SO_RCVBUF)");
 863         } else {
 864             av_log(h, AV_LOG_DEBUG, "end receive buffer size reported is %d\n", tmp);
 865             if(tmp < s->buffer_size)
 866                 av_log(h, AV_LOG_WARNING, "attempted to set receive buffer to size %d but it only ended up set as %d\n", s->buffer_size, tmp);
 867         }
 868
 869         /* make the socket non-blocking */
 870         ff_socket_nonblock(udp_fd, 1);
 871     }
 872     if (s->is_connected) {
 873         if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
 874             ff_log_net_error(h, AV_LOG_ERROR, "connect");
 875             goto fail;
 876         }
 877     }
 878
 879     s->udp_fd = udp_fd;
 880
 881 #if HAVE_PTHREAD_CANCEL
 882     /*
 883       Create thread in case of:
 884       1. Input and circular_buffer_size is set
 885       2. Output and bitrate and circular_buffer_size is set
 886     */
 887
 888     if (is_output && s->bitrate && !s->circular_buffer_size) {
 889         /* Warn user in case of 'circular_buffer_size' is not set */
 890         av_log(h, AV_LOG_WARNING,"'bitrate' option was set but 'circular_buffer_size' is not, but required\n");
 891     }
 892
 893     if ((!is_output && s->circular_buffer_size) || (is_output && s->bitrate && s->circular_buffer_size)) {
 894         int ret;
 895
 896         /* start the task going */
 897         s->fifo = av_fifo_alloc(s->circular_buffer_size);
 898         ret = pthread_mutex_init(&s->mutex, NULL);
 899         if (ret != 0) {
 900             av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret));
 901             goto fail;
 902         }
 903         ret = pthread_cond_init(&s->cond, NULL);
 904         if (ret != 0) {
 905             av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret));
 906             goto cond_fail;
 907         }
 908         ret = pthread_create(&s->circular_buffer_thread, NULL, is_output?circular_buffer_task_tx:circular_buffer_task_rx, h);
 909         if (ret != 0) {
 910             av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret));
 911             goto thread_fail;
 912         }
 913         s->thread_started = 1;
 914     }
 915 #endif
 916
 917     return 0;
 918 #if HAVE_PTHREAD_CANCEL
 919  thread_fail:
 920     pthread_cond_destroy(&s->cond);
 921  cond_fail:
 922     pthread_mutex_destroy(&s->mutex);
 923 #endif
 924  fail:
 925     if (udp_fd >= 0)
 926         closesocket(udp_fd);
 927     av_fifo_freep(&s->fifo);
 928     ff_ip_reset_filters(&s->filters);
 929     return AVERROR(EIO);
 930 }
 931
 932 static int udplite_open(URLContext *h, const char *uri, int flags)
 933 {
 934     UDPContext *s = h->priv_data;
 935
 936     // set default checksum coverage
 937     s->udplite_coverage = UDP_HEADER_SIZE;
 938
 939     return udp_open(h, uri, flags);
 940 }
 941
 942 static int udp_read(URLContext *h, uint8_t *buf, int size)
 943 {
 944     UDPContext *s = h->priv_data;
 945     int ret;
 946     struct sockaddr_storage addr;
 947     socklen_t addr_len = sizeof(addr);
 948 #if HAVE_PTHREAD_CANCEL
 949     int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK;
 950
 951     if (s->fifo) {
 952         pthread_mutex_lock(&s->mutex);
 953         do {
 954             avail = av_fifo_size(s->fifo);
 955             if (avail) { // >=size) {
 956                 uint8_t tmp[4];
 957
 958                 av_fifo_generic_read(s->fifo, tmp, 4, NULL);
 959                 avail= AV_RL32(tmp);
 960                 if(avail > size){
 961                     av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n");
 962                     avail= size;
 963                 }
 964
 965                 av_fifo_generic_read(s->fifo, buf, avail, NULL);
 966                 av_fifo_drain(s->fifo, AV_RL32(tmp) - avail);
 967                 pthread_mutex_unlock(&s->mutex);
 968                 return avail;
 969             } else if(s->circular_buffer_error){
 970                 int err = s->circular_buffer_error;
 971                 pthread_mutex_unlock(&s->mutex);
 972                 return err;
 973             } else if(nonblock) {
 974                 pthread_mutex_unlock(&s->mutex);
 975                 return AVERROR(EAGAIN);
 976             }
 977             else {
 978                 /* FIXME: using the monotonic clock would be better,
 979                    but it does not exist on all supported platforms. */
 980                 int64_t t = av_gettime() + 100000;
 981                 struct timespec tv = { .tv_sec  =  t / 1000000,
 982                                        .tv_nsec = (t % 1000000) * 1000 };
 983                 int err = pthread_cond_timedwait(&s->cond, &s->mutex, &tv);
 984                 if (err) {
 985                     pthread_mutex_unlock(&s->mutex);
 986                     return AVERROR(err == ETIMEDOUT ? EAGAIN : err);
 987                 }
 988                 nonblock = 1;
 989             }
 990         } while( 1);
 991     }
 992 #endif
 993
 994     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
 995         ret = ff_network_wait_fd(s->udp_fd, 0);
 996         if (ret < 0)
 997             return ret;
 998     }
 999     ret = recvfrom(s->udp_fd, buf, size, 0, (struct sockaddr *)&addr, &addr_len);
1000     if (ret < 0)
1001         return ff_neterrno();
1002     if (ff_ip_check_source_lists(&addr, &s->filters))
1003         return AVERROR(EINTR);
1004     return ret;
1005 }
1006
1007 static int udp_write(URLContext *h, const uint8_t *buf, int size)
1008 {
1009     UDPContext *s = h->priv_data;
1010     int ret;
1011
1012 #if HAVE_PTHREAD_CANCEL
1013     if (s->fifo) {
1014         uint8_t tmp[4];
1015
1016         pthread_mutex_lock(&s->mutex);
1017
1018         /*
1019           Return error if last tx failed.
1020           Here we can't know on which packet error was, but it needs to know that error exists.
1021         */
1022         if (s->circular_buffer_error<0) {
1023             int err=s->circular_buffer_error;
1024             pthread_mutex_unlock(&s->mutex);
1025             return err;
1026         }
1027
1028         if(av_fifo_space(s->fifo) < size + 4) {
1029             /* What about a partial packet tx ? */
1030             pthread_mutex_unlock(&s->mutex);
1031             return AVERROR(ENOMEM);
1032         }
1033         AV_WL32(tmp, size);
1034         av_fifo_generic_write(s->fifo, tmp, 4, NULL); /* size of packet */
1035         av_fifo_generic_write(s->fifo, (uint8_t *)buf, size, NULL); /* the data */
1036         pthread_cond_signal(&s->cond);
1037         pthread_mutex_unlock(&s->mutex);
1038         return size;
1039     }
1040 #endif
1041     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
1042         ret = ff_network_wait_fd(s->udp_fd, 1);
1043         if (ret < 0)
1044             return ret;
1045     }
1046
1047     if (!s->is_connected) {
1048         ret = sendto (s->udp_fd, buf, size, 0,
1049                       (struct sockaddr *) &s->dest_addr,
1050                       s->dest_addr_len);
1051     } else
1052         ret = send(s->udp_fd, buf, size, 0);
1053
1054     return ret < 0 ? ff_neterrno() : ret;
1055 }
1056
1057 static int udp_close(URLContext *h)
1058 {
1059     UDPContext *s = h->priv_data;
1060
1061 #if HAVE_PTHREAD_CANCEL
1062     // Request close once writing is finished
1063     if (s->thread_started && !(h->flags & AVIO_FLAG_READ)) {
1064         pthread_mutex_lock(&s->mutex);
1065         s->close_req = 1;
1066         pthread_cond_signal(&s->cond);
1067         pthread_mutex_unlock(&s->mutex);
1068     }
1069 #endif
1070
1071     if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
1072         udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr,(struct sockaddr *)&s->local_addr_storage);
1073 #if HAVE_PTHREAD_CANCEL
1074     if (s->thread_started) {
1075         int ret;
1076         // Cancel only read, as write has been signaled as success to the user
1077         if (h->flags & AVIO_FLAG_READ) {
1078 #ifdef _WIN32
1079             /* recvfrom() is not a cancellation point for win32, so we shutdown
1080              * the socket and abort pending IO, subsequent recvfrom() calls
1081              * will fail with WSAESHUTDOWN causing the thread to exit. */
1082             shutdown(s->udp_fd, SD_RECEIVE);
1083             CancelIoEx((HANDLE)(SOCKET)s->udp_fd, NULL);
1084 #else
1085             pthread_cancel(s->circular_buffer_thread);
1086 #endif
1087         }
1088         ret = pthread_join(s->circular_buffer_thread, NULL);
1089         if (ret != 0)
1090             av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret));
1091         pthread_mutex_destroy(&s->mutex);
1092         pthread_cond_destroy(&s->cond);
1093     }
1094 #endif
1095     closesocket(s->udp_fd);
1096     av_fifo_freep(&s->fifo);
1097     ff_ip_reset_filters(&s->filters);
1098     return 0;
1099 }
1100
1101 const URLProtocol ff_udp_protocol = {
1102     .name                = "udp",
1103     .url_open            = udp_open,
1104     .url_read            = udp_read,
1105     .url_write           = udp_write,
1106     .url_close           = udp_close,
1107     .url_get_file_handle = udp_get_file_handle,
1108     .priv_data_size      = sizeof(UDPContext),
1109     .priv_data_class     = &udp_class,
1110     .flags               = URL_PROTOCOL_FLAG_NETWORK,
1111 };
1112
1113 const URLProtocol ff_udplite_protocol = {
1114     .name                = "udplite",
1115     .url_open            = udplite_open,
1116     .url_read            = udp_read,
1117     .url_write           = udp_write,
1118     .url_close           = udp_close,
1119     .url_get_file_handle = udp_get_file_handle,
1120     .priv_data_size      = sizeof(UDPContext),
1121     .priv_data_class     = &udplite_context_class,
1122     .flags               = URL_PROTOCOL_FLAG_NETWORK,
1123 };