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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 "rtpproto.h"
33 #include "rtsp.h"
34 #include "rdt.h"
35 #include "url.h"
36 
37 static const struct RTSPStatusMessage {
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 
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 
65  rt->real_setup = NULL;
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 
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 
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);
136  }
137  return 0;
138 }
139 
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 
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);
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");
207  "Content-Length exceeds buffer size", request.seq);
208  return AVERROR(EIO);
209 }
210 
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 */
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 !=
254  request.transports[transportidx].lower_transport !=
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");
272  }
273  rtsp_st = rt->rtsp_streams[streamid];
274  localport = rt->rtp_port_min;
275 
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",
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 
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 
352  return 0;
353 }
354 
355 static 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 
364  if (!linept) {
365  av_log(s, AV_LOG_ERROR, "Error parsing method string\n");
366  return AVERROR_INVALIDDATA;
367  }
368 
369  if (linept - line > methodsize - 1) {
370  av_log(s, AV_LOG_ERROR, "Method string too long\n");
371  return AVERROR(EIO);
372  }
373  memcpy(method, line, linept - line);
374  method[linept - line] = '\0';
375  linept++;
376  if (!strcmp(method, "ANNOUNCE"))
377  *methodcode = ANNOUNCE;
378  else if (!strcmp(method, "OPTIONS"))
379  *methodcode = OPTIONS;
380  else if (!strcmp(method, "RECORD"))
381  *methodcode = RECORD;
382  else if (!strcmp(method, "SETUP"))
383  *methodcode = SETUP;
384  else if (!strcmp(method, "PAUSE"))
385  *methodcode = PAUSE;
386  else if (!strcmp(method, "TEARDOWN"))
387  *methodcode = TEARDOWN;
388  else
389  *methodcode = UNKNOWN;
390  /* Check method with the state */
391  if (rt->state == RTSP_STATE_IDLE) {
392  if ((*methodcode != ANNOUNCE) && (*methodcode != OPTIONS)) {
393  av_log(s, AV_LOG_ERROR, "Unexpected command in Idle State %s\n",
394  line);
396  }
397  } else if (rt->state == RTSP_STATE_PAUSED) {
398  if ((*methodcode != OPTIONS) && (*methodcode != RECORD)
399  && (*methodcode != SETUP)) {
400  av_log(s, AV_LOG_ERROR, "Unexpected command in Paused State %s\n",
401  line);
403  }
404  } else if (rt->state == RTSP_STATE_STREAMING) {
405  if ((*methodcode != PAUSE) && (*methodcode != OPTIONS)
406  && (*methodcode != TEARDOWN)) {
407  av_log(s, AV_LOG_ERROR, "Unexpected command in Streaming State"
408  " %s\n", line);
410  }
411  } else {
412  av_log(s, AV_LOG_ERROR, "Unexpected State [%d]\n", rt->state);
413  return AVERROR_BUG;
414  }
415 
416  searchlinept = strchr(linept, ' ');
417  if (!searchlinept) {
418  av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
419  return AVERROR_INVALIDDATA;
420  }
421  if (searchlinept - linept > urisize - 1) {
422  av_log(s, AV_LOG_ERROR, "uri string length exceeded buffer size\n");
423  return AVERROR(EIO);
424  }
425  memcpy(uri, linept, searchlinept - linept);
426  uri[searchlinept - linept] = '\0';
427  if (strcmp(rt->control_uri, uri)) {
428  char host[128], path[512], auth[128];
429  int port;
430  char ctl_host[128], ctl_path[512], ctl_auth[128];
431  int ctl_port;
432  av_url_split(NULL, 0, auth, sizeof(auth), host, sizeof(host), &port,
433  path, sizeof(path), uri);
434  av_url_split(NULL, 0, ctl_auth, sizeof(ctl_auth), ctl_host,
435  sizeof(ctl_host), &ctl_port, ctl_path, sizeof(ctl_path),
436  rt->control_uri);
437  if (strcmp(host, ctl_host))
438  av_log(s, AV_LOG_INFO, "Host %s differs from expected %s\n",
439  host, ctl_host);
440  if (strcmp(path, ctl_path) && *methodcode != SETUP)
441  av_log(s, AV_LOG_WARNING, "WARNING: Path %s differs from expected"
442  " %s\n", path, ctl_path);
443  if (*methodcode == ANNOUNCE) {
444  av_log(s, AV_LOG_INFO,
445  "Updating control URI to %s\n", uri);
446  av_strlcpy(rt->control_uri, uri, sizeof(rt->control_uri));
447  }
448  }
449 
450  linept = searchlinept + 1;
451  if (!av_strstart(linept, "RTSP/1.0", NULL)) {
452  av_log(s, AV_LOG_ERROR, "Error parsing protocol or version\n");
454  }
455  return 0;
456 }
457 
459 {
460  RTSPState *rt = s->priv_data;
461  unsigned char rbuf[4096];
462  unsigned char method[10];
463  char uri[500];
464  int ret;
465  int rbuflen = 0;
466  RTSPMessageHeader request = { 0 };
467  enum RTSPMethod methodcode;
468 
469  ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
470  if (ret < 0)
471  return ret;
472  ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
473  sizeof(method), &methodcode);
474  if (ret) {
475  av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
476  return ret;
477  }
478 
479  ret = rtsp_read_request(s, &request, method);
480  if (ret)
481  return ret;
482  rt->seq++;
483  if (methodcode == PAUSE) {
484  rt->state = RTSP_STATE_PAUSED;
485  ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
486  // TODO: Missing date header in response
487  } else if (methodcode == OPTIONS) {
489  "Public: ANNOUNCE, PAUSE, SETUP, TEARDOWN, "
490  "RECORD\r\n", request.seq);
491  } else if (methodcode == TEARDOWN) {
492  rt->state = RTSP_STATE_IDLE;
493  ret = rtsp_send_reply(s, RTSP_STATUS_OK, NULL , request.seq);
494  return 0;
495  }
496  return ret;
497 }
498 
500 {
501  RTSPState *rt = s->priv_data;
502  RTSPMessageHeader reply1, *reply = &reply1;
503  int i;
504  char cmd[1024];
505 
506  av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
507  rt->nb_byes = 0;
508 
509  if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
510  if (rt->transport == RTSP_TRANSPORT_RTP) {
511  for (i = 0; i < rt->nb_rtsp_streams; i++) {
512  RTSPStream *rtsp_st = rt->rtsp_streams[i];
513  RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
514  if (!rtpctx)
515  continue;
519  rtpctx->base_timestamp = 0;
520  rtpctx->timestamp = 0;
521  rtpctx->unwrapped_timestamp = 0;
522  rtpctx->rtcp_ts_offset = 0;
523  }
524  }
525  if (rt->state == RTSP_STATE_PAUSED) {
526  cmd[0] = 0;
527  } else {
528  snprintf(cmd, sizeof(cmd),
529  "Range: npt=%"PRId64".%03"PRId64"-\r\n",
531  rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
532  }
533  ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
534  if (reply->status_code != RTSP_STATUS_OK) {
535  return ff_rtsp_averror(reply->status_code, -1);
536  }
537  if (rt->transport == RTSP_TRANSPORT_RTP &&
538  reply->range_start != AV_NOPTS_VALUE) {
539  for (i = 0; i < rt->nb_rtsp_streams; i++) {
540  RTSPStream *rtsp_st = rt->rtsp_streams[i];
541  RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
542  AVStream *st = NULL;
543  if (!rtpctx || rtsp_st->stream_index < 0)
544  continue;
545  st = s->streams[rtsp_st->stream_index];
546  rtpctx->range_start_offset =
548  st->time_base);
549  }
550  }
551  }
553  return 0;
554 }
555 
556 /* pause the stream */
558 {
559  RTSPState *rt = s->priv_data;
560  RTSPMessageHeader reply1, *reply = &reply1;
561 
562  if (rt->state != RTSP_STATE_STREAMING)
563  return 0;
564  else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
565  ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
566  if (reply->status_code != RTSP_STATUS_OK) {
567  return ff_rtsp_averror(reply->status_code, -1);
568  }
569  }
570  rt->state = RTSP_STATE_PAUSED;
571  return 0;
572 }
573 
575 {
576  RTSPState *rt = s->priv_data;
577  char cmd[1024];
578  unsigned char *content = NULL;
579  int ret;
580 
581  /* describe the stream */
582  snprintf(cmd, sizeof(cmd),
583  "Accept: application/sdp\r\n");
584  if (rt->server_type == RTSP_SERVER_REAL) {
585  /**
586  * The Require: attribute is needed for proper streaming from
587  * Realmedia servers.
588  */
589  av_strlcat(cmd,
590  "Require: com.real.retain-entity-for-setup\r\n",
591  sizeof(cmd));
592  }
593  ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
594  if (reply->status_code != RTSP_STATUS_OK) {
595  av_freep(&content);
597  }
598  if (!content)
599  return AVERROR_INVALIDDATA;
600 
601  av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
602  /* now we got the SDP description, we parse it */
603  ret = ff_sdp_parse(s, (const char *)content);
604  av_freep(&content);
605  if (ret < 0)
606  return ret;
607 
608  return 0;
609 }
610 
612 {
613  RTSPState *rt = s->priv_data;
614  char proto[128], host[128], path[512], auth[128];
615  char uri[500];
616  int port;
617  int default_port = RTSP_DEFAULT_PORT;
618  char tcpname[500];
619  const char *lower_proto = "tcp";
620  unsigned char rbuf[4096];
621  unsigned char method[10];
622  int rbuflen = 0;
623  int ret;
624  enum RTSPMethod methodcode;
625 
626  /* extract hostname and port */
627  av_url_split(proto, sizeof(proto), auth, sizeof(auth), host, sizeof(host),
628  &port, path, sizeof(path), s->filename);
629 
630  /* ff_url_join. No authorization by now (NULL) */
631  ff_url_join(rt->control_uri, sizeof(rt->control_uri), proto, NULL, host,
632  port, "%s", path);
633 
634  if (!strcmp(proto, "rtsps")) {
635  lower_proto = "tls";
636  default_port = RTSPS_DEFAULT_PORT;
637  }
638 
639  if (port < 0)
640  port = default_port;
641 
642  /* Create TCP connection */
643  ff_url_join(tcpname, sizeof(tcpname), lower_proto, NULL, host, port,
644  "?listen&listen_timeout=%d", rt->initial_timeout * 1000);
645 
646  if (ret = ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
647  &s->interrupt_callback, NULL)) {
648  av_log(s, AV_LOG_ERROR, "Unable to open RTSP for listening\n");
649  return ret;
650  }
651  rt->state = RTSP_STATE_IDLE;
652  rt->rtsp_hd_out = rt->rtsp_hd;
653  for (;;) { /* Wait for incoming RTSP messages */
654  ret = read_line(s, rbuf, sizeof(rbuf), &rbuflen);
655  if (ret < 0)
656  return ret;
657  ret = parse_command_line(s, rbuf, rbuflen, uri, sizeof(uri), method,
658  sizeof(method), &methodcode);
659  if (ret) {
660  av_log(s, AV_LOG_ERROR, "RTSP: Unexpected Command\n");
661  return ret;
662  }
663 
664  if (methodcode == ANNOUNCE) {
665  ret = rtsp_read_announce(s);
666  rt->state = RTSP_STATE_PAUSED;
667  } else if (methodcode == OPTIONS) {
668  ret = rtsp_read_options(s);
669  } else if (methodcode == RECORD) {
670  ret = rtsp_read_record(s);
671  if (!ret)
672  return 0; // We are ready for streaming
673  } else if (methodcode == SETUP)
674  ret = rtsp_read_setup(s, host, uri);
675  if (ret) {
676  ffurl_close(rt->rtsp_hd);
677  return AVERROR_INVALIDDATA;
678  }
679  }
680  return 0;
681 }
682 
683 static int rtsp_probe(AVProbeData *p)
684 {
685  if (
686 #if CONFIG_TLS_PROTOCOL
687  av_strstart(p->filename, "rtsps:", NULL) ||
688 #endif
689  av_strstart(p->filename, "rtsp:", NULL))
690  return AVPROBE_SCORE_MAX;
691  return 0;
692 }
693 
695 {
696  RTSPState *rt = s->priv_data;
697  int ret;
698 
699  if (rt->initial_timeout > 0)
701 
702  if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
703  ret = rtsp_listen(s);
704  if (ret)
705  return ret;
706  } else {
707  ret = ff_rtsp_connect(s);
708  if (ret)
709  return ret;
710 
711  rt->real_setup_cache = !s->nb_streams ? NULL :
712  av_mallocz_array(s->nb_streams, 2 * sizeof(*rt->real_setup_cache));
713  if (!rt->real_setup_cache && s->nb_streams)
714  return AVERROR(ENOMEM);
715  rt->real_setup = rt->real_setup_cache + s->nb_streams;
716 
717  if (rt->initial_pause) {
718  /* do not start immediately */
719  } else {
720  if ((ret = rtsp_read_play(s)) < 0) {
723  return ret;
724  }
725  }
726  }
727 
728  return 0;
729 }
730 
732  uint8_t *buf, int buf_size)
733 {
734  RTSPState *rt = s->priv_data;
735  int id, len, i, ret;
736  RTSPStream *rtsp_st;
737 
738  av_dlog(s, "tcp_read_packet:\n");
739 redo:
740  for (;;) {
741  RTSPMessageHeader reply;
742 
743  ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
744  if (ret < 0)
745  return ret;
746  if (ret == 1) /* received '$' */
747  break;
748  /* XXX: parse message */
749  if (rt->state != RTSP_STATE_STREAMING)
750  return 0;
751  }
752  ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
753  if (ret != 3)
754  return -1;
755  id = buf[0];
756  len = AV_RB16(buf + 1);
757  av_dlog(s, "id=%d len=%d\n", id, len);
758  if (len > buf_size || len < 8)
759  goto redo;
760  /* get the data */
761  ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
762  if (ret != len)
763  return -1;
764  if (rt->transport == RTSP_TRANSPORT_RDT &&
765  ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
766  return -1;
767 
768  /* find the matching stream */
769  for (i = 0; i < rt->nb_rtsp_streams; i++) {
770  rtsp_st = rt->rtsp_streams[i];
771  if (id >= rtsp_st->interleaved_min &&
772  id <= rtsp_st->interleaved_max)
773  goto found;
774  }
775  goto redo;
776 found:
777  *prtsp_st = rtsp_st;
778  return len;
779 }
780 
782 {
783  RTSPState *rt = s->priv_data;
784  char host[1024];
785  int port;
786 
787  av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
788  s->filename);
789  ff_rtsp_undo_setup(s, 0);
791  rt->real_challenge);
792 }
793 
795 {
796  RTSPState *rt = s->priv_data;
797  int ret;
798  RTSPMessageHeader reply1, *reply = &reply1;
799  char cmd[1024];
800 
801 retry:
802  if (rt->server_type == RTSP_SERVER_REAL) {
803  int i;
804 
805  for (i = 0; i < s->nb_streams; i++)
806  rt->real_setup[i] = s->streams[i]->discard;
807 
808  if (!rt->need_subscription) {
809  if (memcmp (rt->real_setup, rt->real_setup_cache,
810  sizeof(enum AVDiscard) * s->nb_streams)) {
811  snprintf(cmd, sizeof(cmd),
812  "Unsubscribe: %s\r\n",
813  rt->last_subscription);
814  ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
815  cmd, reply, NULL);
816  if (reply->status_code != RTSP_STATUS_OK)
818  rt->need_subscription = 1;
819  }
820  }
821 
822  if (rt->need_subscription) {
823  int r, rule_nr, first = 1;
824 
825  memcpy(rt->real_setup_cache, rt->real_setup,
826  sizeof(enum AVDiscard) * s->nb_streams);
827  rt->last_subscription[0] = 0;
828 
829  snprintf(cmd, sizeof(cmd),
830  "Subscribe: ");
831  for (i = 0; i < rt->nb_rtsp_streams; i++) {
832  rule_nr = 0;
833  for (r = 0; r < s->nb_streams; r++) {
834  if (s->streams[r]->id == i) {
835  if (s->streams[r]->discard != AVDISCARD_ALL) {
836  if (!first)
837  av_strlcat(rt->last_subscription, ",",
838  sizeof(rt->last_subscription));
840  rt->last_subscription,
841  sizeof(rt->last_subscription), i, rule_nr);
842  first = 0;
843  }
844  rule_nr++;
845  }
846  }
847  }
848  av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
849  ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
850  cmd, reply, NULL);
851  if (reply->status_code != RTSP_STATUS_OK)
853  rt->need_subscription = 0;
854 
855  if (rt->state == RTSP_STATE_STREAMING)
856  rtsp_read_play (s);
857  }
858  }
859 
860  ret = ff_rtsp_fetch_packet(s, pkt);
861  if (ret < 0) {
862  if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
865  RTSPMessageHeader reply1, *reply = &reply1;
866  av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
867  if (rtsp_read_pause(s) != 0)
868  return -1;
869  // TEARDOWN is required on Real-RTSP, but might make
870  // other servers close the connection.
871  if (rt->server_type == RTSP_SERVER_REAL)
872  ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
873  reply, NULL);
874  rt->session_id[0] = '\0';
875  if (resetup_tcp(s) == 0) {
876  rt->state = RTSP_STATE_IDLE;
877  rt->need_subscription = 1;
878  if (rtsp_read_play(s) != 0)
879  return -1;
880  goto retry;
881  }
882  }
883  }
884  return ret;
885  }
886  rt->packets++;
887 
888  if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) {
889  /* send dummy request to keep TCP connection alive */
890  if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
891  rt->auth_state.stale) {
892  if (rt->server_type == RTSP_SERVER_WMS ||
893  (rt->server_type != RTSP_SERVER_REAL &&
895  ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
896  } else {
897  ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL);
898  }
899  /* The stale flag should be reset when creating the auth response in
900  * ff_rtsp_send_cmd_async, but reset it here just in case we never
901  * called the auth code (if we didn't have any credentials set). */
902  rt->auth_state.stale = 0;
903  }
904  }
905 
906  return 0;
907 }
908 
909 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
910  int64_t timestamp, int flags)
911 {
912  RTSPState *rt = s->priv_data;
913  int ret;
914 
915  rt->seek_timestamp = av_rescale_q(timestamp,
916  s->streams[stream_index]->time_base,
918  switch(rt->state) {
919  default:
920  case RTSP_STATE_IDLE:
921  break;
923  if ((ret = rtsp_read_pause(s)) != 0)
924  return ret;
926  if ((ret = rtsp_read_play(s)) != 0)
927  return ret;
928  break;
929  case RTSP_STATE_PAUSED:
930  rt->state = RTSP_STATE_IDLE;
931  break;
932  }
933  return 0;
934 }
935 
936 static const AVClass rtsp_demuxer_class = {
937  .class_name = "RTSP demuxer",
938  .item_name = av_default_item_name,
939  .option = ff_rtsp_options,
940  .version = LIBAVUTIL_VERSION_INT,
941 };
942 
944  .name = "rtsp",
945  .long_name = NULL_IF_CONFIG_SMALL("RTSP input"),
946  .priv_data_size = sizeof(RTSPState),
952  .flags = AVFMT_NOFILE,
953  .read_play = rtsp_read_play,
954  .read_pause = rtsp_read_pause,
955  .priv_class = &rtsp_demuxer_class,
956 };