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