1/* 2 * RTSP demuxer 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#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 37static 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 55static 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 70static 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 95static 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, message, strlen(message)); 118 119 return 0; 120} 121 122static 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 140static 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 170static 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 211static 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 229static 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 ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL); 291 av_dlog(s, "Opening: %s", url); 292 ret = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE, 293 &s->interrupt_callback, NULL); 294 if (ret) 295 localport += 2; 296 } while (ret || localport > rt->rtp_port_max); 297 if (localport > rt->rtp_port_max) { 298 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq); 299 return ret; 300 } 301 302 av_dlog(s, "Listening on: %d", 303 ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle)); 304 if ((ret = ff_rtsp_open_transport_ctx(s, rtsp_st))) { 305 rtsp_send_reply(s, RTSP_STATUS_TRANSPORT, NULL, request.seq); 306 return ret; 307 } 308 309 localport = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle); 310 snprintf(responseheaders, sizeof(responseheaders), "Transport: " 311 "RTP/AVP/UDP;unicast;mode=receive;source=%s;" 312 "client_port=%d-%d;server_port=%d-%d\r\n", 313 host, request.transports[0].client_port_min, 314 request.transports[0].client_port_max, localport, 315 localport + 1); 316 } 317 318 /* Establish sessionid if not previously set */ 319 /* Put this in a function? */ 320 /* RFC 2326: session id must be at least 8 digits */ 321 while (strlen(rt->session_id) < 8) 322 av_strlcatf(rt->session_id, 512, "%u", av_get_random_seed()); 323 324 av_strlcatf(responseheaders, sizeof(responseheaders), "Session: %s\r\n", 325 rt->session_id); 326 /* Send Reply */ 327 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq); 328 329 rt->state = RTSP_STATE_PAUSED; 330 return 0; 331} 332 333static int rtsp_read_record(AVFormatContext *s) 334{ 335 RTSPState *rt = s->priv_data; 336 RTSPMessageHeader request = { 0 }; 337 int ret = 0; 338 char responseheaders[1024]; 339 340 ret = rtsp_read_request(s, &request, "RECORD"); 341 if (ret) 342 return ret; 343 ret = check_sessionid(s, &request); 344 if (ret) 345 return ret; 346 rt->seq++; 347 snprintf(responseheaders, sizeof(responseheaders), "Session: %s\r\n", 348 rt->session_id); 349 rtsp_send_reply(s, RTSP_STATUS_OK, responseheaders, request.seq); 350 351 rt->state = RTSP_STATE_STREAMING; 352 return 0; 353} 354 355static inline int parse_command_line(AVFormatContext *s, const char *line, 356 int linelen, char *uri, int urisize, 357 char *method, int methodsize, 358 enum RTSPMethod *methodcode) 359{ 360 RTSPState *rt = s->priv_data; 361 const char *linept, *searchlinept; 362 linept = strchr(line, ' '); 363 if (!linept) { 364 av_log(s, AV_LOG_ERROR, "Error parsing method string\n"); 365 return AVERROR_INVALIDDATA; 366 } 367 if (linept - line > methodsize - 1) { 368 av_log(s, AV_LOG_ERROR, "Method string too long\n"); 369 return AVERROR(EIO); 370 } 371 memcpy(method, line, linept - line); 372 method[linept - line] = '\0'; 373 linept++; 374 if (!strcmp(method, "ANNOUNCE")) 375 *methodcode = ANNOUNCE; 376 else if (!strcmp(method, "OPTIONS")) 377 *methodcode = OPTIONS; 378 else if (!strcmp(method, "RECORD")) 379 *methodcode = RECORD; 380 else if (!strcmp(method, "SETUP")) 381 *methodcode = SETUP; 382 else if (!strcmp(method, "PAUSE")) 383 *methodcode = PAUSE; 384 else if (!strcmp(method, "TEARDOWN")) 385 *methodcode = TEARDOWN; 386 else 387 *methodcode = UNKNOWN; 388 /* Check method with the state */ 389 if (rt->state == RTSP_STATE_IDLE) { 390 if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) { 391 av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n", 392 line); 393 return AVERROR_PROTOCOL_NOT_FOUND; 394 } 395 } else if (rt->state == RTSP_STATE_PAUSED) { 396 if ((*methodcode != OPTIONS) && (*methodcode != RECORD) 397 && (*methodcode != SETUP)) { 398 av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n", 399 line); 400 return AVERROR_PROTOCOL_NOT_FOUND; 401 } 402 } else if (rt->state == RTSP_STATE_STREAMING) { 403 if ((*methodcode != PAUSE) && (*methodcode != OPTIONS) 404 && (*methodcode != TEARDOWN)) { 405 av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State" 406 " %s\n", line); 407 return AVERROR_PROTOCOL_NOT_FOUND; 408 } 409 } else { 410 av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state); 411 return AVERROR_BUG; 412 } 413 414 searchlinept = strchr(linept, ' '); 415 if (searchlinept == NULL) { 416 av_log(s, AV_LOG_ERROR, "Error parsing message URI\n"); 417 return AVERROR_INVALIDDATA; 418 } 419 if (searchlinept - linept > urisize - 1) { 420 av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n"); 421 return AVERROR(EIO); 422 } 423 memcpy(uri, linept, searchlinept - linept); 424 uri[searchlinept - linept] = '\0'; 425 if (strcmp(rt->control_uri, uri)) { 426 char host[128], path[512], auth[128]; 427 int port; 428 char ctl_host[128], ctl_path[512], ctl_auth[128]; 429 int ctl_port; 430 av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port, 431 path, sizeof(path), uri); 432 av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host, 433 sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path), 434 rt->control_uri); 435 if (strcmp(host, ctl_host)) 436 av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n", 437 host, ctl_host); 438 if (strcmp(path, ctl_path) && *methodcode != SETUP) 439 av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected" 440 " %s\n", path, ctl_path); 441 if (*methodcode == ANNOUNCE) { 442 av_log(s, AV_LOG_INFO, 443 "Updating control URI to %s\n", uri); 444 av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri)); 445 } 446 } 447 448 linept = searchlinept + 1; 449 if (!av_strstart(linept, "RTSP/1.0", NULL)) { 450 av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n"); 451 return AVERROR_PROTOCOL_NOT_FOUND; 452 } 453 return 0; 454} 455 456int ff_rtsp_parse_streaming_commands(AVFormatContext *s) 457{ 458 RTSPState *rt = s->priv_data; 459 unsigned char rbuf[4096]; 460 unsigned char method[10]; 461 char uri[500]; 462 int ret; 463 int rbuflen = 0; 464 RTSPMessageHeader request = { 0 }; 465 enum RTSPMethod methodcode; 466 467 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen); 468 if (ret < 0) 469 return ret; 470 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method, 471 sizeof(method), &methodcode); 472 if (ret) { 473 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n"); 474 return ret; 475 } 476 477 ret = rtsp_read_request(s, &request, method); 478 if (ret) 479 return ret; 480 rt->seq++; 481 if (methodcode == PAUSE) { 482 rt->state = RTSP_STATE_PAUSED; 483 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq); 484 // TODO: Missing date header in response 485 } else if (methodcode == OPTIONS) { 486 ret = rtsp_send_reply(s, RTSP_STATUS_OK, 487 "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, " 488 "RECORD\r\n", request.seq); 489 } else if (methodcode == TEARDOWN) { 490 rt->state = RTSP_STATE_IDLE; 491 ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq); 492 return 0; 493 } 494 return ret; 495} 496 497static int rtsp_read_play(AVFormatContext *s) 498{ 499 RTSPState *rt = s->priv_data; 500 RTSPMessageHeader reply1, *reply = &reply1; 501 int i; 502 char cmd[1024]; 503 504 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state); 505 rt->nb_byes = 0; 506 507 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) { 508 if (rt->transport == RTSP_TRANSPORT_RTP) { 509 for (i = 0; i < rt->nb_rtsp_streams; i++) { 510 RTSPStream *rtsp_st = rt->rtsp_streams[i]; 511 RTPDemuxContext *rtpctx = rtsp_st->transport_priv; 512 if (!rtpctx) 513 continue; 514 ff_rtp_reset_packet_queue(rtpctx); 515 rtpctx->last_rtcp_ntp_time = AV_NOPTS_VALUE; 516 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE; 517 rtpctx->base_timestamp = 0; 518 rtpctx->timestamp = 0; 519 rtpctx->unwrapped_timestamp = 0; 520 rtpctx->rtcp_ts_offset = 0; 521 } 522 } 523 if (rt->state == RTSP_STATE_PAUSED) { 524 cmd[0] = 0; 525 } else { 526 snprintf(cmd, sizeof(cmd), 527 "Range: npt=%"PRId64".%03"PRId64"-\r\n", 528 rt->seek_timestamp / AV_TIME_BASE, 529 rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000); 530 } 531 ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL); 532 if (reply->status_code != RTSP_STATUS_OK) { 533 return -1; 534 } 535 if (rt->transport == RTSP_TRANSPORT_RTP && 536 reply->range_start != AV_NOPTS_VALUE) { 537 for (i = 0; i < rt->nb_rtsp_streams; i++) { 538 RTSPStream *rtsp_st = rt->rtsp_streams[i]; 539 RTPDemuxContext *rtpctx = rtsp_st->transport_priv; 540 AVStream *st = NULL; 541 if (!rtpctx || rtsp_st->stream_index < 0) 542 continue; 543 st = s->streams[rtsp_st->stream_index]; 544 rtpctx->range_start_offset = 545 av_rescale_q(reply->range_start, AV_TIME_BASE_Q, 546 st->time_base); 547 } 548 } 549 } 550 rt->state = RTSP_STATE_STREAMING; 551 return 0; 552} 553 554/* pause the stream */ 555static int rtsp_read_pause(AVFormatContext *s) 556{ 557 RTSPState *rt = s->priv_data; 558 RTSPMessageHeader reply1, *reply = &reply1; 559 560 if (rt->state != RTSP_STATE_STREAMING) 561 return 0; 562 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) { 563 ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL); 564 if (reply->status_code != RTSP_STATUS_OK) { 565 return -1; 566 } 567 } 568 rt->state = RTSP_STATE_PAUSED; 569 return 0; 570} 571 572int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply) 573{ 574 RTSPState *rt = s->priv_data; 575 char cmd[1024]; 576 unsigned char *content = NULL; 577 int ret; 578 579 /* describe the stream */ 580 snprintf(cmd, sizeof(cmd), 581 "Accept: application/sdp\r\n"); 582 if (rt->server_type == RTSP_SERVER_REAL) { 583 /** 584 * The Require: attribute is needed for proper streaming from 585 * Realmedia servers. 586 */ 587 av_strlcat(cmd, 588 "Require: com.real.retain-entity-for-setup\r\n", 589 sizeof(cmd)); 590 } 591 ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content); 592 if (!content) 593 return AVERROR_INVALIDDATA; 594 if (reply->status_code != RTSP_STATUS_OK) { 595 av_freep(&content); 596 return AVERROR_INVALIDDATA; 597 } 598 599 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content); 600 /* now we got the SDP description, we parse it */ 601 ret = ff_sdp_parse(s, (const char *)content); 602 av_freep(&content); 603 if (ret < 0) 604 return ret; 605 606 return 0; 607} 608 609static int rtsp_listen(AVFormatContext *s) 610{ 611 RTSPState *rt = s->priv_data; 612 char host[128], path[512], auth[128]; 613 char uri[500]; 614 int port; 615 char tcpname[500]; 616 unsigned char rbuf[4096]; 617 unsigned char method[10]; 618 int rbuflen = 0; 619 int ret; 620 enum RTSPMethod methodcode; 621 622 /* extract hostname and port */ 623 av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port, 624 path, sizeof(path), s->filename); 625 626 /* ff_url_join. No authorization by now (NULL) */ 627 ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL, host, 628 port, "%s", path); 629 630 if (port < 0) 631 port = RTSP_DEFAULT_PORT; 632 633 /* Create TCP connection */ 634 ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, 635 "?listen&listen_timeout=%d", rt->initial_timeout * 1000); 636 637 if (ret = ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE, 638 &s->interrupt_callback, NULL)) { 639 av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n"); 640 return ret; 641 } 642 rt->state = RTSP_STATE_IDLE; 643 rt->rtsp_hd_out = rt->rtsp_hd; 644 for (;;) { /* Wait for incoming RTSP messages */ 645 ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen); 646 if (ret < 0) 647 return ret; 648 ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method, 649 sizeof(method), &methodcode); 650 if (ret) { 651 av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n"); 652 return ret; 653 } 654 655 if (methodcode == ANNOUNCE) { 656 ret = rtsp_read_announce(s); 657 rt->state = RTSP_STATE_PAUSED; 658 } else if (methodcode == OPTIONS) { 659 ret = rtsp_read_options(s); 660 } else if (methodcode == RECORD) { 661 ret = rtsp_read_record(s); 662 if (!ret) 663 return 0; // We are ready for streaming 664 } else if (methodcode == SETUP) 665 ret = rtsp_read_setup(s, host, uri); 666 if (ret) { 667 ffurl_close(rt->rtsp_hd); 668 return AVERROR_INVALIDDATA; 669 } 670 } 671 return 0; 672} 673 674static int rtsp_probe(AVProbeData *p) 675{ 676 if (av_strstart(p->filename, "rtsp:", NULL)) 677 return AVPROBE_SCORE_MAX; 678 return 0; 679} 680 681static int rtsp_read_header(AVFormatContext *s) 682{ 683 RTSPState *rt = s->priv_data; 684 int ret; 685 686 if (rt->initial_timeout > 0) 687 rt->rtsp_flags |= RTSP_FLAG_LISTEN; 688 689 if (rt->rtsp_flags & RTSP_FLAG_LISTEN) { 690 ret = rtsp_listen(s); 691 if (ret) 692 return ret; 693 } else { 694 ret = ff_rtsp_connect(s); 695 if (ret) 696 return ret; 697 698 rt->real_setup_cache = !s->nb_streams ? NULL : 699 av_mallocz_array(s->nb_streams, 2 * sizeof(*rt->real_setup_cache)); 700 if (!rt->real_setup_cache && s->nb_streams) 701 return AVERROR(ENOMEM); 702 rt->real_setup = rt->real_setup_cache + s->nb_streams; 703 704 if (rt->initial_pause) { 705 /* do not start immediately */ 706 } else { 707 if (rtsp_read_play(s) < 0) { 708 ff_rtsp_close_streams(s); 709 ff_rtsp_close_connections(s); 710 return AVERROR_INVALIDDATA; 711 } 712 } 713 } 714 715 return 0; 716} 717 718int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st, 719 uint8_t *buf, int buf_size) 720{ 721 RTSPState *rt = s->priv_data; 722 int id, len, i, ret; 723 RTSPStream *rtsp_st; 724 725 av_dlog(s, "tcp_read_packet:\n"); 726redo: 727 for (;;) { 728 RTSPMessageHeader reply; 729 730 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL); 731 if (ret < 0) 732 return ret; 733 if (ret == 1) /* received '$' */ 734 break; 735 /* XXX: parse message */ 736 if (rt->state != RTSP_STATE_STREAMING) 737 return 0; 738 } 739 ret = ffurl_read_complete(rt->rtsp_hd, buf, 3); 740 if (ret != 3) 741 return -1; 742 id = buf[0]; 743 len = AV_RB16(buf + 1); 744 av_dlog(s, "id=%d len=%d\n", id, len); 745 if (len > buf_size || len < 8) 746 goto redo; 747 /* get the data */ 748 ret = ffurl_read_complete(rt->rtsp_hd, buf, len); 749 if (ret != len) 750 return -1; 751 if (rt->transport == RTSP_TRANSPORT_RDT && 752 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0) 753 return -1; 754 755 /* find the matching stream */ 756 for (i = 0; i < rt->nb_rtsp_streams; i++) { 757 rtsp_st = rt->rtsp_streams[i]; 758 if (id >= rtsp_st->interleaved_min && 759 id <= rtsp_st->interleaved_max) 760 goto found; 761 } 762 goto redo; 763found: 764 *prtsp_st = rtsp_st; 765 return len; 766} 767 768static int resetup_tcp(AVFormatContext *s) 769{ 770 RTSPState *rt = s->priv_data; 771 char host[1024]; 772 int port; 773 774 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, 775 s->filename); 776 ff_rtsp_undo_setup(s, 0); 777 return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP, 778 rt->real_challenge); 779} 780 781static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt) 782{ 783 RTSPState *rt = s->priv_data; 784 int ret; 785 RTSPMessageHeader reply1, *reply = &reply1; 786 char cmd[1024]; 787 788retry: 789 if (rt->server_type == RTSP_SERVER_REAL) { 790 int i; 791 792 for (i = 0; i < s->nb_streams; i++) 793 rt->real_setup[i] = s->streams[i]->discard; 794 795 if (!rt->need_subscription) { 796 if (memcmp (rt->real_setup, rt->real_setup_cache, 797 sizeof(enum AVDiscard) * s->nb_streams)) { 798 snprintf(cmd, sizeof(cmd), 799 "Unsubscribe: %s\r\n", 800 rt->last_subscription); 801 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri, 802 cmd, reply, NULL); 803 if (reply->status_code != RTSP_STATUS_OK) 804 return AVERROR_INVALIDDATA; 805 rt->need_subscription = 1; 806 } 807 } 808 809 if (rt->need_subscription) { 810 int r, rule_nr, first = 1; 811 812 memcpy(rt->real_setup_cache, rt->real_setup, 813 sizeof(enum AVDiscard) * s->nb_streams); 814 rt->last_subscription[0] = 0; 815 816 snprintf(cmd, sizeof(cmd), 817 "Subscribe: "); 818 for (i = 0; i < rt->nb_rtsp_streams; i++) { 819 rule_nr = 0; 820 for (r = 0; r < s->nb_streams; r++) { 821 if (s->streams[r]->id == i) { 822 if (s->streams[r]->discard != AVDISCARD_ALL) { 823 if (!first) 824 av_strlcat(rt->last_subscription, ",", 825 sizeof(rt->last_subscription)); 826 ff_rdt_subscribe_rule( 827 rt->last_subscription, 828 sizeof(rt->last_subscription), i, rule_nr); 829 first = 0; 830 } 831 rule_nr++; 832 } 833 } 834 } 835 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription); 836 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri, 837 cmd, reply, NULL); 838 if (reply->status_code != RTSP_STATUS_OK) 839 return AVERROR_INVALIDDATA; 840 rt->need_subscription = 0; 841 842 if (rt->state == RTSP_STATE_STREAMING) 843 rtsp_read_play (s); 844 } 845 } 846 847 ret = ff_rtsp_fetch_packet(s, pkt); 848 if (ret < 0) { 849 if (ret == AVERROR(ETIMEDOUT) && !rt->packets) { 850 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP && 851 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) { 852 RTSPMessageHeader reply1, *reply = &reply1; 853 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n"); 854 if (rtsp_read_pause(s) != 0) 855 return -1; 856 // TEARDOWN is required on Real-RTSP, but might make 857 // other servers close the connection. 858 if (rt->server_type == RTSP_SERVER_REAL) 859 ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL, 860 reply, NULL); 861 rt->session_id[0] = '\0'; 862 if (resetup_tcp(s) == 0) { 863 rt->state = RTSP_STATE_IDLE; 864 rt->need_subscription = 1; 865 if (rtsp_read_play(s) != 0) 866 return -1; 867 goto retry; 868 } 869 } 870 } 871 return ret; 872 } 873 rt->packets++; 874 875 if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) { 876 /* send dummy request to keep TCP connection alive */ 877 if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 || 878 rt->auth_state.stale) { 879 if (rt->server_type == RTSP_SERVER_WMS || 880 (rt->server_type != RTSP_SERVER_REAL && 881 rt->get_parameter_supported)) { 882 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL); 883 } else { 884 ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL); 885 } 886 /* The stale flag should be reset when creating the auth response in 887 * ff_rtsp_send_cmd_async, but reset it here just in case we never 888 * called the auth code (if we didn't have any credentials set). */ 889 rt->auth_state.stale = 0; 890 } 891 } 892 893 return 0; 894} 895 896static int rtsp_read_seek(AVFormatContext *s, int stream_index, 897 int64_t timestamp, int flags) 898{ 899 RTSPState *rt = s->priv_data; 900 901 rt->seek_timestamp = av_rescale_q(timestamp, 902 s->streams[stream_index]->time_base, 903 AV_TIME_BASE_Q); 904 switch(rt->state) { 905 default: 906 case RTSP_STATE_IDLE: 907 break; 908 case RTSP_STATE_STREAMING: 909 if (rtsp_read_pause(s) != 0) 910 return -1; 911 rt->state = RTSP_STATE_SEEKING; 912 if (rtsp_read_play(s) != 0) 913 return -1; 914 break; 915 case RTSP_STATE_PAUSED: 916 rt->state = RTSP_STATE_IDLE; 917 break; 918 } 919 return 0; 920} 921 922static const AVClass rtsp_demuxer_class = { 923 .class_name = "RTSP demuxer", 924 .item_name = av_default_item_name, 925 .option = ff_rtsp_options, 926 .version = LIBAVUTIL_VERSION_INT, 927}; 928 929AVInputFormat ff_rtsp_demuxer = { 930 .name = "rtsp", 931 .long_name = NULL_IF_CONFIG_SMALL("RTSP input"), 932 .priv_data_size = sizeof(RTSPState), 933 .read_probe = rtsp_probe, 934 .read_header = rtsp_read_header, 935 .read_packet = rtsp_read_packet, 936 .read_close = rtsp_read_close, 937 .read_seek = rtsp_read_seek, 938 .flags = AVFMT_NOFILE, 939 .read_play = rtsp_read_play, 940 .read_pause = rtsp_read_pause, 941 .priv_class = &rtsp_demuxer_class, 942}; 943