libavformat/rtspdec.c

   1 /*
   2  * RTSP demuxer
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/avstring.h"
  23 #include "libavutil/intreadwrite.h"
  24 #include "libavutil/mathematics.h"
  25 #include "libavutil/random_seed.h"
  26 #include "libavutil/time.h"
  27 #include "avformat.h"
  28
  29 #include "internal.h"
  30 #include "network.h"
  31 #include "os_support.h"
  32 #include "rtpproto.h"
  33 #include "rtsp.h"
  34 #include "rdt.h"
  35 #include "url.h"
  36
  37 static const struct RTSPStatusMessage {
  38     enum RTSPStatusCode code;
  39     const char *message;
  40 } status_messages[] = {
  41     { RTSP_STATUS_OK,             "OK"                               },
  42     { RTSP_STATUS_METHOD,         "Method Not Allowed"               },
  43     { RTSP_STATUS_BANDWIDTH,      "Not Enough Bandwidth"             },
  44     { RTSP_STATUS_SESSION,        "Session Not Found"                },
  45     { RTSP_STATUS_STATE,          "Method Not Valid in This State"   },
  46     { RTSP_STATUS_AGGREGATE,      "Aggregate operation not allowed"  },
  47     { RTSP_STATUS_ONLY_AGGREGATE, "Only aggregate operation allowed" },
  48     { RTSP_STATUS_TRANSPORT,      "Unsupported transport"            },
  49     { RTSP_STATUS_INTERNAL,       "Internal Server Error"            },
  50     { RTSP_STATUS_SERVICE,        "Service Unavailable"              },
  51     { RTSP_STATUS_VERSION,        "RTSP Version not supported"       },
  52     { 0,                          "NULL"                             }
  53 };
  54
  55 static int rtsp_read_close(AVFormatContext *s)
  56 {
  57     RTSPState *rt = s->priv_data;
  58
  59     if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN))
  60         ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
  61
  62     ff_rtsp_close_streams(s);
  63     ff_rtsp_close_connections(s);
  64     ff_network_close();
  65     rt->real_setup = NULL;
  66     av_freep(&rt->real_setup_cache);
  67     return 0;
  68 }
  69
  70 static inline int read_line(AVFormatContext *s, char *rbuf, const int rbufsize,
  71                             int *rbuflen)
  72 {
  73     RTSPState *rt = s->priv_data;
  74     int idx       = 0;
  75     int ret       = 0;
  76     *rbuflen      = 0;
  77
  78     do {
  79         ret = ffurl_read_complete(rt->rtsp_hd, rbuf + idx, 1);
  80         if (ret <= 0)
  81             return ret ? ret : AVERROR_EOF;
  82         if (rbuf[idx] == '\r') {
  83             /* Ignore */
  84         } else if (rbuf[idx] == '\n') {
  85             rbuf[idx] = '\0';
  86             *rbuflen  = idx;
  87             return 0;
  88         } else
  89             idx++;
  90     } while (idx < rbufsize);
  91     av_log(s, AV_LOG_ERROR, "Message too long\n");
  92     return AVERROR(EIO);
  93 }
  94
  95 static int rtsp_send_reply(AVFormatContext *s, enum RTSPStatusCode code,
  96                            const char *extracontent, uint16_t seq)
  97 {
  98     RTSPState *rt = s->priv_data;
  99     char message[4096];
 100     int index = 0;
 101     while (status_messages[index].code) {
 102         if (status_messages[index].code == code) {
 103             snprintf(message, sizeof(message), "RTSP/1.0 %d %s\r\n",
 104                      code, status_messages[index].message);
 105             break;
 106         }
 107         index++;
 108     }
 109     if (!status_messages[index].code)
 110         return AVERROR(EINVAL);
 111     av_strlcatf(message, sizeof(message), "CSeq: %d\r\n", seq);
 112     av_strlcatf(message, sizeof(message), "Server: %s\r\n", LIBAVFORMAT_IDENT);
 113     if (extracontent)
 114         av_strlcat(message, extracontent, sizeof(message));
 115     av_strlcat(message, "\r\n", sizeof(message));
 116     av_dlog(s, "Sending response:\n%s", message);
 117     ffurl_write(rt->rtsp_hd_out, message, strlen(message));
 118
 119     return 0;
 120 }
 121
 122 static inline int check_sessionid(AVFormatContext *s,
 123                                   RTSPMessageHeader *request)
 124 {
 125     RTSPState *rt = s->priv_data;
 126     unsigned char *session_id = rt->session_id;
 127     if (!session_id[0]) {
 128         av_log(s, AV_LOG_WARNING, "There is no session-id at the moment\n");
 129         return 0;
 130     }
 131     if (strcmp(session_id, request->session_id)) {
 132         av_log(s, AV_LOG_ERROR, "Unexpected session-id %s\n",
 133                request->session_id);
 134         rtsp_send_reply(s, RTSP_STATUS_SESSION, NULL, request->seq);
 135         return AVERROR_STREAM_NOT_FOUND;
 136     }
 137     return 0;
 138 }
 139
 140 static inline int rtsp_read_request(AVFormatContext *s,
 141                                     RTSPMessageHeader *request,
 142                                     const char *method)
 143 {
 144     RTSPState *rt = s->priv_data;
 145     char rbuf[1024];
 146     int rbuflen, ret;
 147     do {
 148         ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
 149         if (ret)
 150             return ret;
 151         if (rbuflen > 1) {
 152             av_dlog(s, "Parsing[%d]: %s\n", rbuflen, rbuf);
 153             ff_rtsp_parse_line(request, rbuf, rt, method);
 154         }
 155     } while (rbuflen > 0);
 156     if (request->seq != rt->seq + 1) {
 157         av_log(s, AV_LOG_ERROR, "Unexpected Sequence number %d\n",
 158                request->seq);
 159         return AVERROR(EINVAL);
 160     }
 161     if (rt->session_id[0] && strcmp(method, "OPTIONS")) {
 162         ret = check_sessionid(s, request);
 163         if (ret)
 164             return ret;
 165     }
 166
 167     return 0;
 168 }
 169
 170 static int rtsp_read_announce(AVFormatContext *s)
 171 {
 172     RTSPState *rt             = s->priv_data;
 173     RTSPMessageHeader request = { 0 };
 174     char sdp[4096];
 175     int  ret;
 176
 177     ret = rtsp_read_request(s, &request, "ANNOUNCE");
 178     if (ret)
 179         return ret;
 180     rt->seq++;
 181     if (strcmp(request.content_type, "application/sdp")) {
 182         av_log(s, AV_LOG_ERROR, "Unexpected content type %s\n",
 183                request.content_type);
 184         rtsp_send_reply(s, RTSP_STATUS_SERVICE, NULL, request.seq);
 185         return AVERROR_OPTION_NOT_FOUND;
 186     }
 187     if (request.content_length && request.content_length < sizeof(sdp) - 1) {
 188         /* Read SDP */
 189         if (ffurl_read_complete(rt->rtsp_hd, sdp, request.content_length)
 190             < request.content_length) {
 191             av_log(s, AV_LOG_ERROR,
 192                    "Unable to get complete SDP Description in ANNOUNCE\n");
 193             rtsp_send_reply(s, RTSP_STATUS_INTERNAL, NULL, request.seq);
 194             return AVERROR(EIO);
 195         }
 196         sdp[request.content_length] = '\0';
 197         av_log(s, AV_LOG_VERBOSE, "SDP: %s\n", sdp);
 198         ret = ff_sdp_parse(s, sdp);
 199         if (ret)
 200             return ret;
 201         rtsp_send_reply(s, RTSP_STATUS_OK, NULL, request.seq);
 202         return 0;
 203     }
 204     av_log(s, AV_LOG_ERROR,
 205            "Content-Length header value exceeds sdp allocated buffer (4KB)\n");
 206     rtsp_send_reply(s, RTSP_STATUS_INTERNAL,
 207                     "Content-Length exceeds buffer size", request.seq);
 208     return AVERROR(EIO);
 209 }
 210
 211 static int rtsp_read_options(AVFormatContext *s)
 212 {
 213     RTSPState *rt             = s->priv_data;
 214     RTSPMessageHeader request = { 0 };
 215     int ret                   = 0;
 216
 217     /* Parsing headers */
 218     ret = rtsp_read_request(s, &request, "OPTIONS");
 219     if (ret)
 220         return ret;
 221     rt->seq++;
 222     /* Send Reply */
 223     rtsp_send_reply(s, RTSP_STATUS_OK,
 224                     "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, RECORD\r\n",
 225                     request.seq);
 226     return 0;
 227 }
 228
 229 static int rtsp_read_setup(AVFormatContext *s, char* host, char *controlurl)
 230 {
 231     RTSPState *rt             = s->priv_data;
 232     RTSPMessageHeader request = { 0 };
 233     int ret                   = 0;
 234     char url[1024];
 235     RTSPStream *rtsp_st;
 236     char responseheaders[1024];
 237     int localport    = -1;
 238     int transportidx = 0;
 239     int streamid     = 0;
 240
 241     ret = rtsp_read_request(s, &request, "SETUP");
 242     if (ret)
 243         return ret;
 244     rt->seq++;
 245     if (!request.nb_transports) {
 246         av_log(s, AV_LOG_ERROR, "No transport defined in SETUP\n");
 247         return AVERROR_INVALIDDATA;
 248     }
 249     for (transportidx = 0; transportidx < request.nb_transports;
 250          transportidx++) {
 251         if (!request.transports[transportidx].mode_record ||
 252             (request.transports[transportidx].lower_transport !=
 253              RTSP_LOWER_TRANSPORT_UDP &&
 254              request.transports[transportidx].lower_transport !=
 255              RTSP_LOWER_TRANSPORT_TCP)) {
 256             av_log(s, AV_LOG_ERROR, "mode=record/receive not set or transport"
 257                    " protocol not supported (yet)\n");
 258             return AVERROR_INVALIDDATA;
 259         }
 260     }
 261     if (request.nb_transports > 1)
 262         av_log(s, AV_LOG_WARNING, "More than one transport not supported, "
 263                "using first of all\n");
 264     for (streamid = 0; streamid < rt->nb_rtsp_streams; streamid++) {
 265         if (!strcmp(rt->rtsp_streams[streamid]->control_url,
 266                     controlurl))
 267             break;
 268     }
 269     if (streamid == rt->nb_rtsp_streams) {
 270         av_log(s, AV_LOG_ERROR, "Unable to find requested track\n");
 271         return AVERROR_STREAM_NOT_FOUND;
 272     }
 273     rtsp_st   = rt->rtsp_streams[streamid];
 274     localport = rt->rtp_port_min;
 275
 276     if (request.transports[0].lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 277         rt->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 278         if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
 279             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
 280             return ret;
 281         }
 282         rtsp_st->interleaved_min = request.transports[0].interleaved_min;
 283         rtsp_st->interleaved_max = request.transports[0].interleaved_max;
 284         snprintf(responseheaders, sizeof(responseheaders), "Transport: "
 285                  "RTP/AVP/TCP;unicast;mode=receive;interleaved=%d-%d"
 286                  "\r\n", request.transports[0].interleaved_min,
 287                  request.transports[0].interleaved_max);
 288     } else {
 289         do {
 290             AVDictionary *opts = NULL;
 291             char buf[256];
 292             snprintf(buf, sizeof(buf), "%d", rt->buffer_size);
 293             av_dict_set(&opts, "buffer_size", buf, 0);
 294             ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);
 295             av_dlog(s, "Opening: %s", url);
 296             ret = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
 297                              &s->interrupt_callback, &opts);
 298             av_dict_free(&opts);
 299             if (ret)
 300                 localport += 2;
 301         } while (ret || localport > rt->rtp_port_max);
 302         if (localport > rt->rtp_port_max) {
 303             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
 304             return ret;
 305         }
 306
 307         av_dlog(s, "Listening on: %d",
 308                 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle));
 309         if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) {
 310             rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq);
 311             return ret;
 312         }
 313
 314         localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
 315         snprintf(responseheaders, sizeof(responseheaders), "Transport: "
 316                  "RTP/AVP/UDP;unicast;mode=receive;source=%s;"
 317                  "client_port=%d-%d;server_port=%d-%d\r\n",
 318                  host, request.transports[0].client_port_min,
 319                  request.transports[0].client_port_max, localport,
 320                  localport + 1);
 321     }
 322
 323     /* Establish sessionid if not previously set */
 324     /* Put this in a function? */
 325     /* RFC 2326: session id must be at least 8 digits */
 326     while (strlen(rt->session_id) < 8)
 327         av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed());
 328
 329     av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
 330                 rt->session_id);
 331     /* Send Reply */
 332     rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
 333
 334     rt->state = RTSP_STATE_PAUSED;
 335     return 0;
 336 }
 337
 338 static int rtsp_read_record(AVFormatContext *s)
 339 {
 340     RTSPState *rt             = s->priv_data;
 341     RTSPMessageHeader request = { 0 };
 342     int ret                   = 0;
 343     char responseheaders[1024];
 344
 345     ret = rtsp_read_request(s, &request, "RECORD");
 346     if (ret)
 347         return ret;
 348     ret = check_sessionid(s, &request);
 349     if (ret)
 350         return ret;
 351     rt->seq++;
 352     snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n",
 353              rt->session_id);
 354     rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq);
 355
 356     rt->state = RTSP_STATE_STREAMING;
 357     return 0;
 358 }
 359
 360 static inline int parse_command_line(AVFormatContext *s, const char *line,
 361                                      int linelen, char *uri, int urisize,
 362                                      char *method, int methodsize,
 363                                      enum RTSPMethod *methodcode)
 364 {
 365     RTSPState *rt = s->priv_data;
 366     const char *linept, *searchlinept;
 367     linept = strchr(line, ' ');
 368
 369     if (!linept)
 370         return AVERROR_INVALIDDATA;
 371
 372     if (linept - line > methodsize - 1) {
 373         av_log(s, AV_LOG_ERROR, "Method string too long\n");
 374         return AVERROR(EIO);
 375     }
 376     memcpy(method, line, linept - line);
 377     method[linept - line] = '\0';
 378     linept++;
 379     if (!strcmp(method, "ANNOUNCE"))
 380         *methodcode = ANNOUNCE;
 381     else if (!strcmp(method, "OPTIONS"))
 382         *methodcode = OPTIONS;
 383     else if (!strcmp(method, "RECORD"))
 384         *methodcode = RECORD;
 385     else if (!strcmp(method, "SETUP"))
 386         *methodcode = SETUP;
 387     else if (!strcmp(method, "PAUSE"))
 388         *methodcode = PAUSE;
 389     else if (!strcmp(method, "TEARDOWN"))
 390         *methodcode = TEARDOWN;
 391     else
 392         *methodcode = UNKNOWN;
 393     /* Check method with the state  */
 394     if (rt->state == RTSP_STATE_IDLE) {
 395         if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) {
 396             av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n",
 397                    line);
 398             return AVERROR_PROTOCOL_NOT_FOUND;
 399         }
 400     } else if (rt->state == RTSP_STATE_PAUSED) {
 401         if ((*methodcode != OPTIONS) && (*methodcode != RECORD)
 402             && (*methodcode != SETUP)) {
 403             av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n",
 404                    line);
 405             return AVERROR_PROTOCOL_NOT_FOUND;
 406         }
 407     } else if (rt->state == RTSP_STATE_STREAMING) {
 408         if ((*methodcode != PAUSE) && (*methodcode != OPTIONS)
 409             && (*methodcode != TEARDOWN)) {
 410             av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State"
 411                    " %s\n", line);
 412             return AVERROR_PROTOCOL_NOT_FOUND;
 413         }
 414     } else {
 415         av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state);
 416         return AVERROR_BUG;
 417     }
 418
 419     searchlinept = strchr(linept, ' ');
 420     if (!searchlinept) {
 421         av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
 422         return AVERROR_INVALIDDATA;
 423     }
 424     if (searchlinept - linept > urisize - 1) {
 425         av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n");
 426         return AVERROR(EIO);
 427     }
 428     memcpy(uri, linept, searchlinept - linept);
 429     uri[searchlinept - linept] = '\0';
 430     if (strcmp(rt->control_uri, uri)) {
 431         char host[128], path[512], auth[128];
 432         int port;
 433         char ctl_host[128], ctl_path[512], ctl_auth[128];
 434         int ctl_port;
 435         av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
 436                      path, sizeof(path), uri);
 437         av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host,
 438                      sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path),
 439                      rt->control_uri);
 440         if (strcmp(host, ctl_host))
 441             av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n",
 442                    host, ctl_host);
 443         if (strcmp(path, ctl_path) && *methodcode != SETUP)
 444             av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected"
 445                    " %s\n", path, ctl_path);
 446         if (*methodcode == ANNOUNCE) {
 447             av_log(s, AV_LOG_INFO,
 448                    "Updating control URI to %s\n", uri);
 449             av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri));
 450         }
 451     }
 452
 453     linept = searchlinept + 1;
 454     if (!av_strstart(linept, "RTSP/1.0", NULL)) {
 455         av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n");
 456         return AVERROR_PROTOCOL_NOT_FOUND;
 457     }
 458     return 0;
 459 }
 460
 461 int ff_rtsp_parse_streaming_commands(AVFormatContext *s)
 462 {
 463     RTSPState *rt = s->priv_data;
 464     unsigned char rbuf[4096];
 465     unsigned char method[10];
 466     char uri[500];
 467     int ret;
 468     int rbuflen               = 0;
 469     RTSPMessageHeader request = { 0 };
 470     enum RTSPMethod methodcode;
 471
 472     ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
 473     if (ret < 0)
 474         return ret;
 475     ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
 476                              sizeof(method), &methodcode);
 477     if (ret) {
 478         av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
 479         return ret;
 480     }
 481
 482     ret = rtsp_read_request(s, &request, method);
 483     if (ret)
 484         return ret;
 485     rt->seq++;
 486     if (methodcode == PAUSE) {
 487         rt->state = RTSP_STATE_PAUSED;
 488         ret       = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
 489         // TODO: Missing date header in response
 490     } else if (methodcode == OPTIONS) {
 491         ret = rtsp_send_reply(s, RTSP_STATUS_OK,
 492                               "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, "
 493                               "RECORD\r\n", request.seq);
 494     } else if (methodcode == TEARDOWN) {
 495         rt->state = RTSP_STATE_IDLE;
 496         ret       = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
 497         return 0;
 498     }
 499     return ret;
 500 }
 501
 502 static int rtsp_read_play(AVFormatContext *s)
 503 {
 504     RTSPState *rt = s->priv_data;
 505     RTSPMessageHeader reply1, *reply = &reply1;
 506     int i;
 507     char cmd[1024];
 508
 509     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
 510     rt->nb_byes = 0;
 511
 512     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
 513         for (i = 0; i < rt->nb_rtsp_streams; i++) {
 514             RTSPStream *rtsp_st = rt->rtsp_streams[i];
 515             /* Try to initialize the connection state in a
 516              * potential NAT router by sending dummy packets.
 517              * RTP/RTCP dummy packets are used for RDT, too.
 518              */
 519             if (rtsp_st->rtp_handle &&
 520                 !(rt->server_type == RTSP_SERVER_WMS && i > 1))
 521                 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);
 522         }
 523     }
 524     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
 525         if (rt->transport == RTSP_TRANSPORT_RTP) {
 526             for (i = 0; i < rt->nb_rtsp_streams; i++) {
 527                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
 528                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
 529                 if (!rtpctx)
 530                     continue;
 531                 ff_rtp_reset_packet_queue(rtpctx);
 532                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
 533                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
 534                 rtpctx->base_timestamp      = 0;
 535                 rtpctx->timestamp           = 0;
 536                 rtpctx->unwrapped_timestamp = 0;
 537                 rtpctx->rtcp_ts_offset      = 0;
 538             }
 539         }
 540         if (rt->state == RTSP_STATE_PAUSED) {
 541             cmd[0] = 0;
 542         } else {
 543             snprintf(cmd, sizeof(cmd),
 544                      "Range: npt=%"PRId64".%03"PRId64"-\r\n",
 545                      rt->seek_timestamp / AV_TIME_BASE,
 546                      rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
 547         }
 548         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
 549         if (reply->status_code != RTSP_STATUS_OK) {
 550             return -1;
 551         }
 552         if (rt->transport == RTSP_TRANSPORT_RTP &&
 553             reply->range_start != AV_NOPTS_VALUE) {
 554             for (i = 0; i < rt->nb_rtsp_streams; i++) {
 555                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
 556                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
 557                 AVStream *st = NULL;
 558                 if (!rtpctx || rtsp_st->stream_index < 0)
 559                     continue;
 560                 st = s->streams[rtsp_st->stream_index];
 561                 rtpctx->range_start_offset =
 562                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
 563                                  st->time_base);
 564             }
 565         }
 566     }
 567     rt->state = RTSP_STATE_STREAMING;
 568     return 0;
 569 }
 570
 571 /* pause the stream */
 572 static int rtsp_read_pause(AVFormatContext *s)
 573 {
 574     RTSPState *rt = s->priv_data;
 575     RTSPMessageHeader reply1, *reply = &reply1;
 576
 577     if (rt->state != RTSP_STATE_STREAMING)
 578         return 0;
 579     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
 580         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
 581         if (reply->status_code != RTSP_STATUS_OK) {
 582             return -1;
 583         }
 584     }
 585     rt->state = RTSP_STATE_PAUSED;
 586     return 0;
 587 }
 588
 589 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
 590 {
 591     RTSPState *rt = s->priv_data;
 592     char cmd[1024];
 593     unsigned char *content = NULL;
 594     int ret;
 595
 596     /* describe the stream */
 597     snprintf(cmd, sizeof(cmd),
 598              "Accept: application/sdp\r\n");
 599     if (rt->server_type == RTSP_SERVER_REAL) {
 600         /**
 601          * The Require: attribute is needed for proper streaming from
 602          * Realmedia servers.
 603          */
 604         av_strlcat(cmd,
 605                    "Require: com.real.retain-entity-for-setup\r\n",
 606                    sizeof(cmd));
 607     }
 608     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
 609     if (!content)
 610         return AVERROR_INVALIDDATA;
 611     if (reply->status_code != RTSP_STATUS_OK) {
 612         av_freep(&content);
 613         return AVERROR_INVALIDDATA;
 614     }
 615
 616     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
 617     /* now we got the SDP description, we parse it */
 618     ret = ff_sdp_parse(s, (const char *)content);
 619     av_freep(&content);
 620     if (ret < 0)
 621         return ret;
 622
 623     return 0;
 624 }
 625
 626 static int rtsp_listen(AVFormatContext *s)
 627 {
 628     RTSPState *rt = s->priv_data;
 629     char proto[128], host[128], path[512], auth[128];
 630     char uri[500];
 631     int port;
 632     int default_port = RTSP_DEFAULT_PORT;
 633     char tcpname[500];
 634     const char *lower_proto = "tcp";
 635     unsigned char rbuf[4096];
 636     unsigned char method[10];
 637     int rbuflen = 0;
 638     int ret;
 639     enum RTSPMethod methodcode;
 640
 641     /* extract hostname and port */
 642     av_url_split(proto, sizeof(proto), auth, sizeof(auth), host, sizeof(host),
 643                  &port, path, sizeof(path), s->filename);
 644
 645     /* ff_url_join. No authorization by now (NULL) */
 646     ff_url_join(rt->control_uri, sizeof(rt->control_uri), proto, NULL, host,
 647                 port, "%s", path);
 648
 649     if (!strcmp(proto, "rtsps")) {
 650         lower_proto  = "tls";
 651         default_port = RTSPS_DEFAULT_PORT;
 652     }
 653
 654     if (port < 0)
 655         port = default_port;
 656
 657     /* Create TCP connection */
 658     ff_url_join(tcpname, sizeof(tcpname), lower_proto, NULL, host, port,
 659                 "?listen&listen_timeout=%d", rt->initial_timeout * 1000);
 660
 661     if (ret = ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
 662                          &s->interrupt_callback, NULL)) {
 663         av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n");
 664         return ret;
 665     }
 666     rt->state       = RTSP_STATE_IDLE;
 667     rt->rtsp_hd_out = rt->rtsp_hd;
 668     for (;;) { /* Wait for incoming RTSP messages */
 669         ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
 670         if (ret < 0)
 671             return ret;
 672         ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
 673                                  sizeof(method), &methodcode);
 674         if (ret) {
 675             av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
 676             return ret;
 677         }
 678
 679         if (methodcode == ANNOUNCE) {
 680             ret       = rtsp_read_announce(s);
 681             rt->state = RTSP_STATE_PAUSED;
 682         } else if (methodcode == OPTIONS) {
 683             ret = rtsp_read_options(s);
 684         } else if (methodcode == RECORD) {
 685             ret = rtsp_read_record(s);
 686             if (!ret)
 687                 return 0; // We are ready for streaming
 688         } else if (methodcode == SETUP)
 689             ret = rtsp_read_setup(s, host, uri);
 690         if (ret) {
 691             ffurl_close(rt->rtsp_hd);
 692             return AVERROR_INVALIDDATA;
 693         }
 694     }
 695     return 0;
 696 }
 697
 698 static int rtsp_probe(AVProbeData *p)
 699 {
 700     if (
 701 #if CONFIG_TLS_PROTOCOL
 702         av_strstart(p->filename, "rtsps:", NULL) ||
 703 #endif
 704         av_strstart(p->filename, "rtsp:", NULL))
 705         return AVPROBE_SCORE_MAX;
 706     return 0;
 707 }
 708
 709 static int rtsp_read_header(AVFormatContext *s)
 710 {
 711     RTSPState *rt = s->priv_data;
 712     int ret;
 713
 714     if (rt->initial_timeout > 0)
 715         rt->rtsp_flags |= RTSP_FLAG_LISTEN;
 716
 717     if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
 718         ret = rtsp_listen(s);
 719         if (ret)
 720             return ret;
 721     } else {
 722         ret = ff_rtsp_connect(s);
 723         if (ret)
 724             return ret;
 725
 726         rt->real_setup_cache = !s->nb_streams ? NULL :
 727             av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
 728         if (!rt->real_setup_cache && s->nb_streams)
 729             return AVERROR(ENOMEM);
 730         rt->real_setup = rt->real_setup_cache + s->nb_streams;
 731
 732         if (rt->initial_pause) {
 733             /* do not start immediately */
 734         } else {
 735             if (rtsp_read_play(s) < 0) {
 736                 ff_rtsp_close_streams(s);
 737                 ff_rtsp_close_connections(s);
 738                 return AVERROR_INVALIDDATA;
 739             }
 740         }
 741     }
 742
 743     return 0;
 744 }
 745
 746 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
 747                             uint8_t *buf, int buf_size)
 748 {
 749     RTSPState *rt = s->priv_data;
 750     int id, len, i, ret;
 751     RTSPStream *rtsp_st;
 752
 753     av_dlog(s, "tcp_read_packet:\n");
 754 redo:
 755     for (;;) {
 756         RTSPMessageHeader reply;
 757
 758         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
 759         if (ret < 0)
 760             return ret;
 761         if (ret == 1) /* received '$' */
 762             break;
 763         /* XXX: parse message */
 764         if (rt->state != RTSP_STATE_STREAMING)
 765             return 0;
 766     }
 767     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
 768     if (ret != 3)
 769         return -1;
 770     id  = buf[0];
 771     len = AV_RB16(buf + 1);
 772     av_dlog(s, "id=%d len=%d\n", id, len);
 773     if (len > buf_size || len < 12)
 774         goto redo;
 775     /* get the data */
 776     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
 777     if (ret != len)
 778         return -1;
 779     if (rt->transport == RTSP_TRANSPORT_RDT &&
 780         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
 781         return -1;
 782
 783     /* find the matching stream */
 784     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 785         rtsp_st = rt->rtsp_streams[i];
 786         if (id >= rtsp_st->interleaved_min &&
 787             id <= rtsp_st->interleaved_max)
 788             goto found;
 789     }
 790     goto redo;
 791 found:
 792     *prtsp_st = rtsp_st;
 793     return len;
 794 }
 795
 796 static int resetup_tcp(AVFormatContext *s)
 797 {
 798     RTSPState *rt = s->priv_data;
 799     char host[1024];
 800     int port;
 801
 802     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
 803                  s->filename);
 804     ff_rtsp_undo_setup(s, 0);
 805     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
 806                                       rt->real_challenge);
 807 }
 808
 809 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
 810 {
 811     RTSPState *rt = s->priv_data;
 812     int ret;
 813     RTSPMessageHeader reply1, *reply = &reply1;
 814     char cmd[1024];
 815
 816 retry:
 817     if (rt->server_type == RTSP_SERVER_REAL) {
 818         int i;
 819
 820         for (i = 0; i < s->nb_streams; i++)
 821             rt->real_setup[i] = s->streams[i]->discard;
 822
 823         if (!rt->need_subscription) {
 824             if (memcmp (rt->real_setup, rt->real_setup_cache,
 825                         sizeof(enum AVDiscard) * s->nb_streams)) {
 826                 snprintf(cmd, sizeof(cmd),
 827                          "Unsubscribe: %s\r\n",
 828                          rt->last_subscription);
 829                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 830                                  cmd, reply, NULL);
 831                 if (reply->status_code != RTSP_STATUS_OK)
 832                     return AVERROR_INVALIDDATA;
 833                 rt->need_subscription = 1;
 834             }
 835         }
 836
 837         if (rt->need_subscription) {
 838             int r, rule_nr, first = 1;
 839
 840             memcpy(rt->real_setup_cache, rt->real_setup,
 841                    sizeof(enum AVDiscard) * s->nb_streams);
 842             rt->last_subscription[0] = 0;
 843
 844             snprintf(cmd, sizeof(cmd),
 845                      "Subscribe: ");
 846             for (i = 0; i < rt->nb_rtsp_streams; i++) {
 847                 rule_nr = 0;
 848                 for (r = 0; r < s->nb_streams; r++) {
 849                     if (s->streams[r]->id == i) {
 850                         if (s->streams[r]->discard != AVDISCARD_ALL) {
 851                             if (!first)
 852                                 av_strlcat(rt->last_subscription, ",",
 853                                            sizeof(rt->last_subscription));
 854                             ff_rdt_subscribe_rule(
 855                                 rt->last_subscription,
 856                                 sizeof(rt->last_subscription), i, rule_nr);
 857                             first = 0;
 858                         }
 859                         rule_nr++;
 860                     }
 861                 }
 862             }
 863             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
 864             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 865                              cmd, reply, NULL);
 866             if (reply->status_code != RTSP_STATUS_OK)
 867                 return AVERROR_INVALIDDATA;
 868             rt->need_subscription = 0;
 869
 870             if (rt->state == RTSP_STATE_STREAMING)
 871                 rtsp_read_play (s);
 872         }
 873     }
 874
 875     ret = ff_rtsp_fetch_packet(s, pkt);
 876     if (ret < 0) {
 877         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
 878             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 879                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
 880                 RTSPMessageHeader reply1, *reply = &reply1;
 881                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
 882                 if (rtsp_read_pause(s) != 0)
 883                     return -1;
 884                 // TEARDOWN is required on Real-RTSP, but might make
 885                 // other servers close the connection.
 886                 if (rt->server_type == RTSP_SERVER_REAL)
 887                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
 888                                      reply, NULL);
 889                 rt->session_id[0] = '\0';
 890                 if (resetup_tcp(s) == 0) {
 891                     rt->state = RTSP_STATE_IDLE;
 892                     rt->need_subscription = 1;
 893                     if (rtsp_read_play(s) != 0)
 894                         return -1;
 895                     goto retry;
 896                 }
 897             }
 898         }
 899         return ret;
 900     }
 901     rt->packets++;
 902
 903     if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) {
 904         /* send dummy request to keep TCP connection alive */
 905         if ((av_gettime_relative() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
 906             rt->auth_state.stale) {
 907             if (rt->server_type == RTSP_SERVER_WMS ||
 908                 (rt->server_type != RTSP_SERVER_REAL &&
 909                  rt->get_parameter_supported)) {
 910                 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
 911             } else {
 912                 ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL);
 913             }
 914             /* The stale flag should be reset when creating the auth response in
 915              * ff_rtsp_send_cmd_async, but reset it here just in case we never
 916              * called the auth code (if we didn't have any credentials set). */
 917             rt->auth_state.stale = 0;
 918         }
 919     }
 920
 921     return 0;
 922 }
 923
 924 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
 925                           int64_t timestamp, int flags)
 926 {
 927     RTSPState *rt = s->priv_data;
 928
 929     rt->seek_timestamp = av_rescale_q(timestamp,
 930                                       s->streams[stream_index]->time_base,
 931                                       AV_TIME_BASE_Q);
 932     switch(rt->state) {
 933     default:
 934     case RTSP_STATE_IDLE:
 935         break;
 936     case RTSP_STATE_STREAMING:
 937         if (rtsp_read_pause(s) != 0)
 938             return -1;
 939         rt->state = RTSP_STATE_SEEKING;
 940         if (rtsp_read_play(s) != 0)
 941             return -1;
 942         break;
 943     case RTSP_STATE_PAUSED:
 944         rt->state = RTSP_STATE_IDLE;
 945         break;
 946     }
 947     return 0;
 948 }
 949
 950 static const AVClass rtsp_demuxer_class = {
 951     .class_name     = "RTSP demuxer",
 952     .item_name      = av_default_item_name,
 953     .option         = ff_rtsp_options,
 954     .version        = LIBAVUTIL_VERSION_INT,
 955 };
 956
 957 AVInputFormat ff_rtsp_demuxer = {
 958     .name           = "rtsp",
 959     .long_name      = NULL_IF_CONFIG_SMALL("RTSP input"),
 960     .priv_data_size = sizeof(RTSPState),
 961     .read_probe     = rtsp_probe,
 962     .read_header    = rtsp_read_header,
 963     .read_packet    = rtsp_read_packet,
 964     .read_close     = rtsp_read_close,
 965     .read_seek      = rtsp_read_seek,
 966     .flags          = AVFMT_NOFILE,
 967     .read_play      = rtsp_read_play,
 968     .read_pause     = rtsp_read_pause,
 969     .priv_class     = &rtsp_demuxer_class,
 970 };