libavformat/rtpproto.c

   1 /*
   2  * RTP network protocol
   3  * Copyright (c) 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  * RTP protocol
  25  */
  26
  27 #include "libavutil/parseutils.h"
  28 #include "libavutil/avstring.h"
  29 #include "libavutil/opt.h"
  30 #include "avformat.h"
  31 #include "avio_internal.h"
  32 #include "rtp.h"
  33 #include "rtpproto.h"
  34 #include "url.h"
  35
  36 #include <stdarg.h>
  37 #include "internal.h"
  38 #include "network.h"
  39 #include "os_support.h"
  40 #include <fcntl.h>
  41 #if HAVE_POLL_H
  42 #include <sys/poll.h>
  43 #endif
  44
  45 typedef struct RTPContext {
  46     const AVClass *class;
  47     URLContext *rtp_hd, *rtcp_hd;
  48     int rtp_fd, rtcp_fd, nb_ssm_include_addrs, nb_ssm_exclude_addrs;
  49     struct sockaddr_storage **ssm_include_addrs, **ssm_exclude_addrs;
  50     int write_to_source;
  51     struct sockaddr_storage last_rtp_source, last_rtcp_source;
  52     socklen_t last_rtp_source_len, last_rtcp_source_len;
  53     int ttl;
  54     int buffer_size;
  55     int rtcp_port, local_rtpport, local_rtcpport;
  56     int connect;
  57     int pkt_size;
  58     int dscp;
  59     char *sources;
  60     char *block;
  61 } RTPContext;
  62
  63 #define OFFSET(x) offsetof(RTPContext, x)
  64 #define D AV_OPT_FLAG_DECODING_PARAM
  65 #define E AV_OPT_FLAG_ENCODING_PARAM
  66 static const AVOption options[] = {
  67     { "ttl",                "Time to live (in milliseconds, multicast only)",                   OFFSET(ttl),             AV_OPT_TYPE_INT,    { .i64 = -1 },    -1, INT_MAX, .flags = D|E },
  68     { "buffer_size",        "Send/Receive buffer size (in bytes)",                              OFFSET(buffer_size),     AV_OPT_TYPE_INT,    { .i64 = -1 },    -1, INT_MAX, .flags = D|E },
  69     { "rtcp_port",          "Custom rtcp port",                                                 OFFSET(rtcp_port),       AV_OPT_TYPE_INT,    { .i64 = -1 },    -1, INT_MAX, .flags = D|E },
  70     { "local_rtpport",      "Local rtp port",                                                   OFFSET(local_rtpport),   AV_OPT_TYPE_INT,    { .i64 = -1 },    -1, INT_MAX, .flags = D|E },
  71     { "local_rtcpport",     "Local rtcp port",                                                  OFFSET(local_rtcpport),  AV_OPT_TYPE_INT,    { .i64 = -1 },    -1, INT_MAX, .flags = D|E },
  72     { "connect",            "Connect socket",                                                   OFFSET(connect),         AV_OPT_TYPE_BOOL,   { .i64 =  0 },     0, 1,       .flags = D|E },
  73     { "write_to_source",    "Send packets to the source address of the latest received packet", OFFSET(write_to_source), AV_OPT_TYPE_BOOL,   { .i64 =  0 },     0, 1,       .flags = D|E },
  74     { "pkt_size",           "Maximum packet size",                                              OFFSET(pkt_size),        AV_OPT_TYPE_INT,    { .i64 = -1 },    -1, INT_MAX, .flags = D|E },
  75     { "dscp",               "DSCP class",                                                       OFFSET(dscp),            AV_OPT_TYPE_INT,    { .i64 = -1 },    -1, INT_MAX, .flags = D|E },
  76     { "sources",            "Source list",                                                      OFFSET(sources),         AV_OPT_TYPE_STRING, { .str = NULL },               .flags = D|E },
  77     { "block",              "Block list",                                                       OFFSET(block),           AV_OPT_TYPE_STRING, { .str = NULL },               .flags = D|E },
  78     { NULL }
  79 };
  80
  81 static const AVClass rtp_class = {
  82     .class_name = "rtp",
  83     .item_name  = av_default_item_name,
  84     .option     = options,
  85     .version    = LIBAVUTIL_VERSION_INT,
  86 };
  87
  88 /**
  89  * If no filename is given to av_open_input_file because you want to
  90  * get the local port first, then you must call this function to set
  91  * the remote server address.
  92  *
  93  * @param h media file context
  94  * @param uri of the remote server
  95  * @return zero if no error.
  96  */
  97
  98 int ff_rtp_set_remote_url(URLContext *h, const char *uri)
  99 {
 100     RTPContext *s = h->priv_data;
 101     char hostname[256];
 102     int port, rtcp_port;
 103     const char *p;
 104
 105     char buf[1024];
 106     char path[1024];
 107
 108     av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
 109                  path, sizeof(path), uri);
 110     rtcp_port = port + 1;
 111
 112     p = strchr(uri, '?');
 113     if (p) {
 114         if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
 115             rtcp_port = strtol(buf, NULL, 10);
 116         }
 117     }
 118
 119     ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
 120     ff_udp_set_remote_url(s->rtp_hd, buf);
 121
 122     ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, rtcp_port, "%s", path);
 123     ff_udp_set_remote_url(s->rtcp_hd, buf);
 124     return 0;
 125 }
 126
 127 static struct addrinfo* rtp_resolve_host(const char *hostname, int port,
 128                                          int type, int family, int flags)
 129 {
 130     struct addrinfo hints = { 0 }, *res = 0;
 131     int error;
 132     char service[16];
 133
 134     snprintf(service, sizeof(service), "%d", port);
 135     hints.ai_socktype = type;
 136     hints.ai_family   = family;
 137     hints.ai_flags    = flags;
 138     if ((error = getaddrinfo(hostname, service, &hints, &res))) {
 139         res = NULL;
 140         av_log(NULL, AV_LOG_ERROR, "rtp_resolve_host: %s\n", gai_strerror(error));
 141     }
 142
 143     return res;
 144 }
 145
 146 static int compare_addr(const struct sockaddr_storage *a,
 147                         const struct sockaddr_storage *b)
 148 {
 149     if (a->ss_family != b->ss_family)
 150         return 1;
 151     if (a->ss_family == AF_INET) {
 152         return (((const struct sockaddr_in *)a)->sin_addr.s_addr !=
 153                 ((const struct sockaddr_in *)b)->sin_addr.s_addr);
 154     }
 155
 156 #if HAVE_STRUCT_SOCKADDR_IN6
 157     if (a->ss_family == AF_INET6) {
 158         const uint8_t *s6_addr_a = ((const struct sockaddr_in6 *)a)->sin6_addr.s6_addr;
 159         const uint8_t *s6_addr_b = ((const struct sockaddr_in6 *)b)->sin6_addr.s6_addr;
 160         return memcmp(s6_addr_a, s6_addr_b, 16);
 161     }
 162 #endif
 163     return 1;
 164 }
 165
 166 static int get_port(const struct sockaddr_storage *ss)
 167 {
 168     if (ss->ss_family == AF_INET)
 169         return ntohs(((const struct sockaddr_in *)ss)->sin_port);
 170 #if HAVE_STRUCT_SOCKADDR_IN6
 171     if (ss->ss_family == AF_INET6)
 172         return ntohs(((const struct sockaddr_in6 *)ss)->sin6_port);
 173 #endif
 174     return 0;
 175 }
 176
 177 static void set_port(struct sockaddr_storage *ss, int port)
 178 {
 179     if (ss->ss_family == AF_INET)
 180         ((struct sockaddr_in *)ss)->sin_port = htons(port);
 181 #if HAVE_STRUCT_SOCKADDR_IN6
 182     else if (ss->ss_family == AF_INET6)
 183         ((struct sockaddr_in6 *)ss)->sin6_port = htons(port);
 184 #endif
 185 }
 186
 187 static int rtp_check_source_lists(RTPContext *s, struct sockaddr_storage *source_addr_ptr)
 188 {
 189     int i;
 190     if (s->nb_ssm_exclude_addrs) {
 191         for (i = 0; i < s->nb_ssm_exclude_addrs; i++) {
 192             if (!compare_addr(source_addr_ptr, s->ssm_exclude_addrs[i]))
 193                 return 1;
 194         }
 195     }
 196     if (s->nb_ssm_include_addrs) {
 197         for (i = 0; i < s->nb_ssm_include_addrs; i++) {
 198             if (!compare_addr(source_addr_ptr, s->ssm_include_addrs[i]))
 199                 return 0;
 200         }
 201         return 1;
 202     }
 203     return 0;
 204 }
 205
 206 /**
 207  * add option to url of the form:
 208  * "http://host:port/path?option1=val1&option2=val2...
 209  */
 210
 211 static av_printf_format(3, 4) void url_add_option(char *buf, int buf_size, const char *fmt, ...)
 212 {
 213     char buf1[1024];
 214     va_list ap;
 215
 216     va_start(ap, fmt);
 217     if (strchr(buf, '?'))
 218         av_strlcat(buf, "&", buf_size);
 219     else
 220         av_strlcat(buf, "?", buf_size);
 221     vsnprintf(buf1, sizeof(buf1), fmt, ap);
 222     av_strlcat(buf, buf1, buf_size);
 223     va_end(ap);
 224 }
 225
 226 static void build_udp_url(RTPContext *s,
 227                           char *buf, int buf_size,
 228                           const char *hostname,
 229                           int port, int local_port,
 230                           const char *include_sources,
 231                           const char *exclude_sources)
 232 {
 233     ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
 234     if (local_port >= 0)
 235         url_add_option(buf, buf_size, "localport=%d", local_port);
 236     if (s->ttl >= 0)
 237         url_add_option(buf, buf_size, "ttl=%d", s->ttl);
 238     if (s->buffer_size >= 0)
 239         url_add_option(buf, buf_size, "buffer_size=%d", s->buffer_size);
 240     if (s->pkt_size >= 0)
 241         url_add_option(buf, buf_size, "pkt_size=%d", s->pkt_size);
 242     if (s->connect)
 243         url_add_option(buf, buf_size, "connect=1");
 244     if (s->dscp >= 0)
 245         url_add_option(buf, buf_size, "dscp=%d", s->dscp);
 246     url_add_option(buf, buf_size, "fifo_size=0");
 247     if (include_sources && include_sources[0])
 248         url_add_option(buf, buf_size, "sources=%s", include_sources);
 249     if (exclude_sources && exclude_sources[0])
 250         url_add_option(buf, buf_size, "block=%s", exclude_sources);
 251 }
 252
 253 static void rtp_parse_addr_list(URLContext *h, char *buf,
 254                                 struct sockaddr_storage ***address_list_ptr,
 255                                 int *address_list_size_ptr)
 256 {
 257     struct addrinfo *ai = NULL;
 258     struct sockaddr_storage *source_addr;
 259     char tmp = '\0', *p = buf, *next;
 260
 261     /* Resolve all of the IPs */
 262
 263     while (p && p[0]) {
 264         next = strchr(p, ',');
 265
 266         if (next) {
 267             tmp = *next;
 268             *next = '\0';
 269         }
 270
 271         ai = rtp_resolve_host(p, 0, SOCK_DGRAM, AF_UNSPEC, 0);
 272         if (ai) {
 273             source_addr = av_mallocz(sizeof(struct sockaddr_storage));
 274             if (!source_addr) {
 275                 freeaddrinfo(ai);
 276                 break;
 277             }
 278
 279             memcpy(source_addr, ai->ai_addr, ai->ai_addrlen);
 280             freeaddrinfo(ai);
 281             dynarray_add(address_list_ptr, address_list_size_ptr, source_addr);
 282         } else {
 283             av_log(h, AV_LOG_WARNING, "Unable to resolve %s\n", p);
 284         }
 285
 286         if (next) {
 287             *next = tmp;
 288             p = next + 1;
 289         } else {
 290             p = NULL;
 291         }
 292     }
 293 }
 294
 295 /**
 296  * url syntax: rtp://host:port[?option=val...]
 297  * option: 'ttl=n'            : set the ttl value (for multicast only)
 298  *         'rtcpport=n'       : set the remote rtcp port to n
 299  *         'localrtpport=n'   : set the local rtp port to n
 300  *         'localrtcpport=n'  : set the local rtcp port to n
 301  *         'pkt_size=n'       : set max packet size
 302  *         'connect=0/1'      : do a connect() on the UDP socket
 303  *         'sources=ip[,ip]'  : list allowed source IP addresses
 304  *         'block=ip[,ip]'    : list disallowed source IP addresses
 305  *         'write_to_source=0/1' : send packets to the source address of the latest received packet
 306  *         'dscp=n'           : set DSCP value to n (QoS)
 307  * deprecated option:
 308  *         'localport=n'      : set the local port to n
 309  *
 310  * if rtcpport isn't set the rtcp port will be the rtp port + 1
 311  * if local rtp port isn't set any available port will be used for the local
 312  * rtp and rtcp ports
 313  * if the local rtcp port is not set it will be the local rtp port + 1
 314  */
 315
 316 static int rtp_open(URLContext *h, const char *uri, int flags)
 317 {
 318     RTPContext *s = h->priv_data;
 319     int rtp_port;
 320     char hostname[256], include_sources[1024] = "", exclude_sources[1024] = "";
 321     char *sources = include_sources, *block = exclude_sources;
 322     char buf[1024];
 323     char path[1024];
 324     const char *p;
 325     int i, max_retry_count = 3;
 326     int rtcpflags;
 327
 328     av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
 329                  path, sizeof(path), uri);
 330     /* extract parameters */
 331     if (s->rtcp_port < 0)
 332         s->rtcp_port = rtp_port + 1;
 333
 334     p = strchr(uri, '?');
 335     if (p) {
 336         if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
 337             s->ttl = strtol(buf, NULL, 10);
 338         }
 339         if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
 340             s->rtcp_port = strtol(buf, NULL, 10);
 341         }
 342         if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
 343             s->local_rtpport = strtol(buf, NULL, 10);
 344         }
 345         if (av_find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
 346             s->local_rtpport = strtol(buf, NULL, 10);
 347         }
 348         if (av_find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
 349             s->local_rtcpport = strtol(buf, NULL, 10);
 350         }
 351         if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
 352             s->pkt_size = strtol(buf, NULL, 10);
 353         }
 354         if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
 355             s->connect = strtol(buf, NULL, 10);
 356         }
 357         if (av_find_info_tag(buf, sizeof(buf), "write_to_source", p)) {
 358             s->write_to_source = strtol(buf, NULL, 10);
 359         }
 360         if (av_find_info_tag(buf, sizeof(buf), "dscp", p)) {
 361             s->dscp = strtol(buf, NULL, 10);
 362         }
 363         if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
 364             av_strlcpy(include_sources, buf, sizeof(include_sources));
 365
 366             rtp_parse_addr_list(h, buf, &s->ssm_include_addrs, &s->nb_ssm_include_addrs);
 367         } else {
 368             rtp_parse_addr_list(h, s->sources, &s->ssm_include_addrs, &s->nb_ssm_include_addrs);
 369             sources = s->sources;
 370         }
 371         if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
 372             av_strlcpy(exclude_sources, buf, sizeof(exclude_sources));
 373             rtp_parse_addr_list(h, buf, &s->ssm_exclude_addrs, &s->nb_ssm_exclude_addrs);
 374         } else {
 375             rtp_parse_addr_list(h, s->block, &s->ssm_exclude_addrs, &s->nb_ssm_exclude_addrs);
 376             block = s->block;
 377         }
 378     }
 379
 380     for (i = 0; i < max_retry_count; i++) {
 381         build_udp_url(s, buf, sizeof(buf),
 382                       hostname, rtp_port, s->local_rtpport,
 383                       sources, block);
 384         if (ffurl_open_whitelist(&s->rtp_hd, buf, flags, &h->interrupt_callback,
 385                                  NULL, h->protocol_whitelist, h->protocol_blacklist, h) < 0)
 386             goto fail;
 387         s->local_rtpport = ff_udp_get_local_port(s->rtp_hd);
 388         if(s->local_rtpport == 65535) {
 389             s->local_rtpport = -1;
 390             continue;
 391         }
 392         rtcpflags = flags | AVIO_FLAG_WRITE;
 393         if (s->local_rtcpport < 0) {
 394             s->local_rtcpport = s->local_rtpport + 1;
 395             build_udp_url(s, buf, sizeof(buf),
 396                           hostname, s->rtcp_port, s->local_rtcpport,
 397                           sources, block);
 398             if (ffurl_open_whitelist(&s->rtcp_hd, buf, rtcpflags,
 399                                      &h->interrupt_callback, NULL,
 400                                      h->protocol_whitelist, h->protocol_blacklist, h) < 0) {
 401                 s->local_rtpport = s->local_rtcpport = -1;
 402                 continue;
 403             }
 404             break;
 405         }
 406         build_udp_url(s, buf, sizeof(buf),
 407                       hostname, s->rtcp_port, s->local_rtcpport,
 408                       sources, block);
 409         if (ffurl_open_whitelist(&s->rtcp_hd, buf, rtcpflags, &h->interrupt_callback,
 410                                  NULL, h->protocol_whitelist, h->protocol_blacklist, h) < 0)
 411             goto fail;
 412         break;
 413     }
 414
 415     /* just to ease handle access. XXX: need to suppress direct handle
 416        access */
 417     s->rtp_fd = ffurl_get_file_handle(s->rtp_hd);
 418     s->rtcp_fd = ffurl_get_file_handle(s->rtcp_hd);
 419
 420     h->max_packet_size = s->rtp_hd->max_packet_size;
 421     h->is_streamed = 1;
 422     return 0;
 423
 424  fail:
 425     if (s->rtp_hd)
 426         ffurl_close(s->rtp_hd);
 427     if (s->rtcp_hd)
 428         ffurl_close(s->rtcp_hd);
 429     return AVERROR(EIO);
 430 }
 431
 432 static int rtp_read(URLContext *h, uint8_t *buf, int size)
 433 {
 434     RTPContext *s = h->priv_data;
 435     int len, n, i;
 436     struct pollfd p[2] = {{s->rtp_fd, POLLIN, 0}, {s->rtcp_fd, POLLIN, 0}};
 437     int poll_delay = h->flags & AVIO_FLAG_NONBLOCK ? 0 : 100;
 438     struct sockaddr_storage *addrs[2] = { &s->last_rtp_source, &s->last_rtcp_source };
 439     socklen_t *addr_lens[2] = { &s->last_rtp_source_len, &s->last_rtcp_source_len };
 440
 441     for(;;) {
 442         if (ff_check_interrupt(&h->interrupt_callback))
 443             return AVERROR_EXIT;
 444         n = poll(p, 2, poll_delay);
 445         if (n > 0) {
 446             /* first try RTCP, then RTP */
 447             for (i = 1; i >= 0; i--) {
 448                 if (!(p[i].revents & POLLIN))
 449                     continue;
 450                 *addr_lens[i] = sizeof(*addrs[i]);
 451                 len = recvfrom(p[i].fd, buf, size, 0,
 452                                 (struct sockaddr *)addrs[i], addr_lens[i]);
 453                 if (len < 0) {
 454                     if (ff_neterrno() == AVERROR(EAGAIN) ||
 455                         ff_neterrno() == AVERROR(EINTR))
 456                         continue;
 457                     return AVERROR(EIO);
 458                 }
 459                 if (rtp_check_source_lists(s, addrs[i]))
 460                     continue;
 461                 return len;
 462             }
 463         } else if (n < 0) {
 464             if (ff_neterrno() == AVERROR(EINTR))
 465                 continue;
 466             return AVERROR(EIO);
 467         }
 468         if (h->flags & AVIO_FLAG_NONBLOCK)
 469             return AVERROR(EAGAIN);
 470     }
 471     return len;
 472 }
 473
 474 static int rtp_write(URLContext *h, const uint8_t *buf, int size)
 475 {
 476     RTPContext *s = h->priv_data;
 477     int ret;
 478     URLContext *hd;
 479
 480     if (size < 2)
 481         return AVERROR(EINVAL);
 482
 483     if ((buf[0] & 0xc0) != (RTP_VERSION << 6))
 484         av_log(h, AV_LOG_WARNING, "Data doesn't look like RTP packets, "
 485                                   "make sure the RTP muxer is used\n");
 486
 487     if (s->write_to_source) {
 488         int fd;
 489         struct sockaddr_storage *source, temp_source;
 490         socklen_t *source_len, temp_len;
 491         if (!s->last_rtp_source.ss_family && !s->last_rtcp_source.ss_family) {
 492             av_log(h, AV_LOG_ERROR,
 493                    "Unable to send packet to source, no packets received yet\n");
 494             // Intentionally not returning an error here
 495             return size;
 496         }
 497
 498         if (RTP_PT_IS_RTCP(buf[1])) {
 499             fd = s->rtcp_fd;
 500             source     = &s->last_rtcp_source;
 501             source_len = &s->last_rtcp_source_len;
 502         } else {
 503             fd = s->rtp_fd;
 504             source     = &s->last_rtp_source;
 505             source_len = &s->last_rtp_source_len;
 506         }
 507         if (!source->ss_family) {
 508             source      = &temp_source;
 509             source_len  = &temp_len;
 510             if (RTP_PT_IS_RTCP(buf[1])) {
 511                 temp_source = s->last_rtp_source;
 512                 temp_len    = s->last_rtp_source_len;
 513                 set_port(source, get_port(source) + 1);
 514                 av_log(h, AV_LOG_INFO,
 515                        "Not received any RTCP packets yet, inferring peer port "
 516                        "from the RTP port\n");
 517             } else {
 518                 temp_source = s->last_rtcp_source;
 519                 temp_len    = s->last_rtcp_source_len;
 520                 set_port(source, get_port(source) - 1);
 521                 av_log(h, AV_LOG_INFO,
 522                        "Not received any RTP packets yet, inferring peer port "
 523                        "from the RTCP port\n");
 524             }
 525         }
 526
 527         if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
 528             ret = ff_network_wait_fd(fd, 1);
 529             if (ret < 0)
 530                 return ret;
 531         }
 532         ret = sendto(fd, buf, size, 0, (struct sockaddr *) source,
 533                      *source_len);
 534
 535         return ret < 0 ? ff_neterrno() : ret;
 536     }
 537
 538     if (RTP_PT_IS_RTCP(buf[1])) {
 539         /* RTCP payload type */
 540         hd = s->rtcp_hd;
 541     } else {
 542         /* RTP payload type */
 543         hd = s->rtp_hd;
 544     }
 545
 546     ret = ffurl_write(hd, buf, size);
 547     return ret;
 548 }
 549
 550 static int rtp_close(URLContext *h)
 551 {
 552     RTPContext *s = h->priv_data;
 553     int i;
 554
 555     for (i = 0; i < s->nb_ssm_include_addrs; i++)
 556         av_freep(&s->ssm_include_addrs[i]);
 557     av_freep(&s->ssm_include_addrs);
 558     for (i = 0; i < s->nb_ssm_exclude_addrs; i++)
 559         av_freep(&s->ssm_exclude_addrs[i]);
 560     av_freep(&s->ssm_exclude_addrs);
 561
 562     ffurl_close(s->rtp_hd);
 563     ffurl_close(s->rtcp_hd);
 564     return 0;
 565 }
 566
 567 /**
 568  * Return the local rtp port used by the RTP connection
 569  * @param h media file context
 570  * @return the local port number
 571  */
 572
 573 int ff_rtp_get_local_rtp_port(URLContext *h)
 574 {
 575     RTPContext *s = h->priv_data;
 576     return ff_udp_get_local_port(s->rtp_hd);
 577 }
 578
 579 /**
 580  * Return the local rtcp port used by the RTP connection
 581  * @param h media file context
 582  * @return the local port number
 583  */
 584
 585 int ff_rtp_get_local_rtcp_port(URLContext *h)
 586 {
 587     RTPContext *s = h->priv_data;
 588     return ff_udp_get_local_port(s->rtcp_hd);
 589 }
 590
 591 static int rtp_get_file_handle(URLContext *h)
 592 {
 593     RTPContext *s = h->priv_data;
 594     return s->rtp_fd;
 595 }
 596
 597 static int rtp_get_multi_file_handle(URLContext *h, int **handles,
 598                                      int *numhandles)
 599 {
 600     RTPContext *s = h->priv_data;
 601     int *hs       = *handles = av_malloc(sizeof(**handles) * 2);
 602     if (!hs)
 603         return AVERROR(ENOMEM);
 604     hs[0] = s->rtp_fd;
 605     hs[1] = s->rtcp_fd;
 606     *numhandles = 2;
 607     return 0;
 608 }
 609
 610 const URLProtocol ff_rtp_protocol = {
 611     .name                      = "rtp",
 612     .url_open                  = rtp_open,
 613     .url_read                  = rtp_read,
 614     .url_write                 = rtp_write,
 615     .url_close                 = rtp_close,
 616     .url_get_file_handle       = rtp_get_file_handle,
 617     .url_get_multi_file_handle = rtp_get_multi_file_handle,
 618     .priv_data_size            = sizeof(RTPContext),
 619     .flags                     = URL_PROTOCOL_FLAG_NETWORK,
 620     .priv_data_class           = &rtp_class,
 621 };