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