rtsp.c
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1 /*
2  * RTSP/SDP client
3  * Copyright (c) 2002 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/base64.h"
23 #include "libavutil/avstring.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/mathematics.h"
26 #include "libavutil/parseutils.h"
27 #include "libavutil/random_seed.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/opt.h"
30 #include "avformat.h"
31 #include "avio_internal.h"
32 
33 #include <sys/time.h>
34 #if HAVE_POLL_H
35 #include <poll.h>
36 #endif
37 #include "internal.h"
38 #include "network.h"
39 #include "os_support.h"
40 #include "http.h"
41 #include "rtsp.h"
42 
43 #include "rtpdec.h"
44 #include "rdt.h"
45 #include "rtpdec_formats.h"
46 #include "rtpenc_chain.h"
47 #include "url.h"
48 #include "rtpenc.h"
49 
50 //#define DEBUG
51 
52 /* Timeout values for socket poll, in ms,
53  * and read_packet(), in seconds */
54 #define POLL_TIMEOUT_MS 100
55 #define READ_PACKET_TIMEOUT_S 10
56 #define MAX_TIMEOUTS READ_PACKET_TIMEOUT_S * 1000 / POLL_TIMEOUT_MS
57 #define SDP_MAX_SIZE 16384
58 #define RECVBUF_SIZE 10 * RTP_MAX_PACKET_LENGTH
59 
60 #define OFFSET(x) offsetof(RTSPState, x)
61 #define DEC AV_OPT_FLAG_DECODING_PARAM
62 #define ENC AV_OPT_FLAG_ENCODING_PARAM
63 
64 #define RTSP_FLAG_OPTS(name, longname) \
65  { name, longname, OFFSET(rtsp_flags), AV_OPT_TYPE_FLAGS, {0}, INT_MIN, INT_MAX, DEC, "rtsp_flags" }, \
66  { "filter_src", "Only receive packets from the negotiated peer IP", 0, AV_OPT_TYPE_CONST, {RTSP_FLAG_FILTER_SRC}, 0, 0, DEC, "rtsp_flags" }
67 
68 #define RTSP_MEDIATYPE_OPTS(name, longname) \
69  { name, longname, OFFSET(media_type_mask), AV_OPT_TYPE_FLAGS, { (1 << (AVMEDIA_TYPE_DATA+1)) - 1 }, INT_MIN, INT_MAX, DEC, "allowed_media_types" }, \
70  { "video", "Video", 0, AV_OPT_TYPE_CONST, {1 << AVMEDIA_TYPE_VIDEO}, 0, 0, DEC, "allowed_media_types" }, \
71  { "audio", "Audio", 0, AV_OPT_TYPE_CONST, {1 << AVMEDIA_TYPE_AUDIO}, 0, 0, DEC, "allowed_media_types" }, \
72  { "data", "Data", 0, AV_OPT_TYPE_CONST, {1 << AVMEDIA_TYPE_DATA}, 0, 0, DEC, "allowed_media_types" }
73 
75  { "initial_pause", "Don't start playing the stream immediately", OFFSET(initial_pause), AV_OPT_TYPE_INT, {0}, 0, 1, DEC },
76  FF_RTP_FLAG_OPTS(RTSPState, rtp_muxer_flags),
77  { "rtsp_transport", "RTSP transport protocols", OFFSET(lower_transport_mask), AV_OPT_TYPE_FLAGS, {0}, INT_MIN, INT_MAX, DEC|ENC, "rtsp_transport" }, \
78  { "udp", "UDP", 0, AV_OPT_TYPE_CONST, {1 << RTSP_LOWER_TRANSPORT_UDP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
79  { "tcp", "TCP", 0, AV_OPT_TYPE_CONST, {1 << RTSP_LOWER_TRANSPORT_TCP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
80  { "udp_multicast", "UDP multicast", 0, AV_OPT_TYPE_CONST, {1 << RTSP_LOWER_TRANSPORT_UDP_MULTICAST}, 0, 0, DEC, "rtsp_transport" },
81  { "http", "HTTP tunneling", 0, AV_OPT_TYPE_CONST, {(1 << RTSP_LOWER_TRANSPORT_HTTP)}, 0, 0, DEC, "rtsp_transport" },
82  RTSP_FLAG_OPTS("rtsp_flags", "RTSP flags"),
83  RTSP_MEDIATYPE_OPTS("allowed_media_types", "Media types to accept from the server"),
84  { NULL },
85 };
86 
87 static const AVOption sdp_options[] = {
88  RTSP_FLAG_OPTS("sdp_flags", "SDP flags"),
89  RTSP_MEDIATYPE_OPTS("allowed_media_types", "Media types to accept from the server"),
90  { NULL },
91 };
92 
93 static const AVOption rtp_options[] = {
94  RTSP_FLAG_OPTS("rtp_flags", "RTP flags"),
95  { NULL },
96 };
97 
98 static void get_word_until_chars(char *buf, int buf_size,
99  const char *sep, const char **pp)
100 {
101  const char *p;
102  char *q;
103 
104  p = *pp;
105  p += strspn(p, SPACE_CHARS);
106  q = buf;
107  while (!strchr(sep, *p) && *p != '\0') {
108  if ((q - buf) < buf_size - 1)
109  *q++ = *p;
110  p++;
111  }
112  if (buf_size > 0)
113  *q = '\0';
114  *pp = p;
115 }
116 
117 static void get_word_sep(char *buf, int buf_size, const char *sep,
118  const char **pp)
119 {
120  if (**pp == '/') (*pp)++;
121  get_word_until_chars(buf, buf_size, sep, pp);
122 }
123 
124 static void get_word(char *buf, int buf_size, const char **pp)
125 {
126  get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
127 }
128 
133 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
134 {
135  char buf[256];
136 
137  p += strspn(p, SPACE_CHARS);
138  if (!av_stristart(p, "npt=", &p))
139  return;
140 
141  *start = AV_NOPTS_VALUE;
142  *end = AV_NOPTS_VALUE;
143 
144  get_word_sep(buf, sizeof(buf), "-", &p);
145  av_parse_time(start, buf, 1);
146  if (*p == '-') {
147  p++;
148  get_word_sep(buf, sizeof(buf), "-", &p);
149  av_parse_time(end, buf, 1);
150  }
151 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
152 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
153 }
154 
155 static int get_sockaddr(const char *buf, struct sockaddr_storage *sock)
156 {
157  struct addrinfo hints, *ai = NULL;
158  memset(&hints, 0, sizeof(hints));
159  hints.ai_flags = AI_NUMERICHOST;
160  if (getaddrinfo(buf, NULL, &hints, &ai))
161  return -1;
162  memcpy(sock, ai->ai_addr, FFMIN(sizeof(*sock), ai->ai_addrlen));
163  freeaddrinfo(ai);
164  return 0;
165 }
166 
167 #if CONFIG_RTPDEC
168 static void init_rtp_handler(RTPDynamicProtocolHandler *handler,
169  RTSPStream *rtsp_st, AVCodecContext *codec)
170 {
171  if (!handler)
172  return;
173  codec->codec_id = handler->codec_id;
174  rtsp_st->dynamic_handler = handler;
175  if (handler->alloc) {
176  rtsp_st->dynamic_protocol_context = handler->alloc();
177  if (!rtsp_st->dynamic_protocol_context)
178  rtsp_st->dynamic_handler = NULL;
179  }
180 }
181 
182 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
183 static int sdp_parse_rtpmap(AVFormatContext *s,
184  AVStream *st, RTSPStream *rtsp_st,
185  int payload_type, const char *p)
186 {
187  AVCodecContext *codec = st->codec;
188  char buf[256];
189  int i;
190  AVCodec *c;
191  const char *c_name;
192 
193  /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
194  * see if we can handle this kind of payload.
195  * The space should normally not be there but some Real streams or
196  * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
197  * have a trailing space. */
198  get_word_sep(buf, sizeof(buf), "/ ", &p);
199  if (payload_type >= RTP_PT_PRIVATE) {
200  RTPDynamicProtocolHandler *handler =
202  init_rtp_handler(handler, rtsp_st, codec);
203  /* If no dynamic handler was found, check with the list of standard
204  * allocated types, if such a stream for some reason happens to
205  * use a private payload type. This isn't handled in rtpdec.c, since
206  * the format name from the rtpmap line never is passed into rtpdec. */
207  if (!rtsp_st->dynamic_handler)
208  codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
209  } else {
210  /* We are in a standard case
211  * (from http://www.iana.org/assignments/rtp-parameters). */
212  /* search into AVRtpPayloadTypes[] */
213  codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
214  }
215 
216  c = avcodec_find_decoder(codec->codec_id);
217  if (c && c->name)
218  c_name = c->name;
219  else
220  c_name = "(null)";
221 
222  get_word_sep(buf, sizeof(buf), "/", &p);
223  i = atoi(buf);
224  switch (codec->codec_type) {
225  case AVMEDIA_TYPE_AUDIO:
226  av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
229  if (i > 0) {
230  codec->sample_rate = i;
231  avpriv_set_pts_info(st, 32, 1, codec->sample_rate);
232  get_word_sep(buf, sizeof(buf), "/", &p);
233  i = atoi(buf);
234  if (i > 0)
235  codec->channels = i;
236  // TODO: there is a bug here; if it is a mono stream, and
237  // less than 22000Hz, faad upconverts to stereo and twice
238  // the frequency. No problem, but the sample rate is being
239  // set here by the sdp line. Patch on its way. (rdm)
240  }
241  av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
242  codec->sample_rate);
243  av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
244  codec->channels);
245  break;
246  case AVMEDIA_TYPE_VIDEO:
247  av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
248  if (i > 0)
249  avpriv_set_pts_info(st, 32, 1, i);
250  break;
251  default:
252  break;
253  }
254  if (rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->init)
255  rtsp_st->dynamic_handler->init(s, st->index,
256  rtsp_st->dynamic_protocol_context);
257  return 0;
258 }
259 
260 /* parse the attribute line from the fmtp a line of an sdp response. This
261  * is broken out as a function because it is used in rtp_h264.c, which is
262  * forthcoming. */
263 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
264  char *value, int value_size)
265 {
266  *p += strspn(*p, SPACE_CHARS);
267  if (**p) {
268  get_word_sep(attr, attr_size, "=", p);
269  if (**p == '=')
270  (*p)++;
271  get_word_sep(value, value_size, ";", p);
272  if (**p == ';')
273  (*p)++;
274  return 1;
275  }
276  return 0;
277 }
278 
279 typedef struct SDPParseState {
280  /* SDP only */
281  struct sockaddr_storage default_ip;
282  int default_ttl;
283  int skip_media;
284 } SDPParseState;
285 
286 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
287  int letter, const char *buf)
288 {
289  RTSPState *rt = s->priv_data;
290  char buf1[64], st_type[64];
291  const char *p;
292  enum AVMediaType codec_type;
293  int payload_type, i;
294  AVStream *st;
295  RTSPStream *rtsp_st;
296  struct sockaddr_storage sdp_ip;
297  int ttl;
298 
299  av_dlog(s, "sdp: %c='%s'\n", letter, buf);
300 
301  p = buf;
302  if (s1->skip_media && letter != 'm')
303  return;
304  switch (letter) {
305  case 'c':
306  get_word(buf1, sizeof(buf1), &p);
307  if (strcmp(buf1, "IN") != 0)
308  return;
309  get_word(buf1, sizeof(buf1), &p);
310  if (strcmp(buf1, "IP4") && strcmp(buf1, "IP6"))
311  return;
312  get_word_sep(buf1, sizeof(buf1), "/", &p);
313  if (get_sockaddr(buf1, &sdp_ip))
314  return;
315  ttl = 16;
316  if (*p == '/') {
317  p++;
318  get_word_sep(buf1, sizeof(buf1), "/", &p);
319  ttl = atoi(buf1);
320  }
321  if (s->nb_streams == 0) {
322  s1->default_ip = sdp_ip;
323  s1->default_ttl = ttl;
324  } else {
325  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
326  rtsp_st->sdp_ip = sdp_ip;
327  rtsp_st->sdp_ttl = ttl;
328  }
329  break;
330  case 's':
331  av_dict_set(&s->metadata, "title", p, 0);
332  break;
333  case 'i':
334  if (s->nb_streams == 0) {
335  av_dict_set(&s->metadata, "comment", p, 0);
336  break;
337  }
338  break;
339  case 'm':
340  /* new stream */
341  s1->skip_media = 0;
342  codec_type = AVMEDIA_TYPE_UNKNOWN;
343  get_word(st_type, sizeof(st_type), &p);
344  if (!strcmp(st_type, "audio")) {
345  codec_type = AVMEDIA_TYPE_AUDIO;
346  } else if (!strcmp(st_type, "video")) {
347  codec_type = AVMEDIA_TYPE_VIDEO;
348  } else if (!strcmp(st_type, "application")) {
349  codec_type = AVMEDIA_TYPE_DATA;
350  }
351  if (codec_type == AVMEDIA_TYPE_UNKNOWN || !(rt->media_type_mask & (1 << codec_type))) {
352  s1->skip_media = 1;
353  return;
354  }
355  rtsp_st = av_mallocz(sizeof(RTSPStream));
356  if (!rtsp_st)
357  return;
358  rtsp_st->stream_index = -1;
359  dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
360 
361  rtsp_st->sdp_ip = s1->default_ip;
362  rtsp_st->sdp_ttl = s1->default_ttl;
363 
364  get_word(buf1, sizeof(buf1), &p); /* port */
365  rtsp_st->sdp_port = atoi(buf1);
366 
367  get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
368 
369  /* XXX: handle list of formats */
370  get_word(buf1, sizeof(buf1), &p); /* format list */
371  rtsp_st->sdp_payload_type = atoi(buf1);
372 
373  if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
374  /* no corresponding stream */
375  } else {
376  st = avformat_new_stream(s, NULL);
377  if (!st)
378  return;
379  st->id = rt->nb_rtsp_streams - 1;
380  rtsp_st->stream_index = st->index;
381  st->codec->codec_type = codec_type;
382  if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
383  RTPDynamicProtocolHandler *handler;
384  /* if standard payload type, we can find the codec right now */
386  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
387  st->codec->sample_rate > 0)
388  avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
389  /* Even static payload types may need a custom depacketizer */
390  handler = ff_rtp_handler_find_by_id(
391  rtsp_st->sdp_payload_type, st->codec->codec_type);
392  init_rtp_handler(handler, rtsp_st, st->codec);
393  if (handler && handler->init)
394  handler->init(s, st->index,
395  rtsp_st->dynamic_protocol_context);
396  }
397  }
398  /* put a default control url */
399  av_strlcpy(rtsp_st->control_url, rt->control_uri,
400  sizeof(rtsp_st->control_url));
401  break;
402  case 'a':
403  if (av_strstart(p, "control:", &p)) {
404  if (s->nb_streams == 0) {
405  if (!strncmp(p, "rtsp://", 7))
406  av_strlcpy(rt->control_uri, p,
407  sizeof(rt->control_uri));
408  } else {
409  char proto[32];
410  /* get the control url */
411  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
412 
413  /* XXX: may need to add full url resolution */
414  av_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
415  NULL, NULL, 0, p);
416  if (proto[0] == '\0') {
417  /* relative control URL */
418  if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
419  av_strlcat(rtsp_st->control_url, "/",
420  sizeof(rtsp_st->control_url));
421  av_strlcat(rtsp_st->control_url, p,
422  sizeof(rtsp_st->control_url));
423  } else
424  av_strlcpy(rtsp_st->control_url, p,
425  sizeof(rtsp_st->control_url));
426  }
427  } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
428  /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
429  get_word(buf1, sizeof(buf1), &p);
430  payload_type = atoi(buf1);
431  st = s->streams[s->nb_streams - 1];
432  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
433  sdp_parse_rtpmap(s, st, rtsp_st, payload_type, p);
434  } else if (av_strstart(p, "fmtp:", &p) ||
435  av_strstart(p, "framesize:", &p)) {
436  /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
437  // let dynamic protocol handlers have a stab at the line.
438  get_word(buf1, sizeof(buf1), &p);
439  payload_type = atoi(buf1);
440  for (i = 0; i < rt->nb_rtsp_streams; i++) {
441  rtsp_st = rt->rtsp_streams[i];
442  if (rtsp_st->sdp_payload_type == payload_type &&
443  rtsp_st->dynamic_handler &&
445  rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
446  rtsp_st->dynamic_protocol_context, buf);
447  }
448  } else if (av_strstart(p, "range:", &p)) {
449  int64_t start, end;
450 
451  // this is so that seeking on a streamed file can work.
452  rtsp_parse_range_npt(p, &start, &end);
453  s->start_time = start;
454  /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
455  s->duration = (end == AV_NOPTS_VALUE) ?
456  AV_NOPTS_VALUE : end - start;
457  } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
458  if (atoi(p) == 1)
460  } else if (av_strstart(p, "SampleRate:integer;", &p) &&
461  s->nb_streams > 0) {
462  st = s->streams[s->nb_streams - 1];
463  st->codec->sample_rate = atoi(p);
464  } else {
465  if (rt->server_type == RTSP_SERVER_WMS)
467  if (s->nb_streams > 0) {
468  if (rt->server_type == RTSP_SERVER_REAL)
469  ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
470 
471  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
472  if (rtsp_st->dynamic_handler &&
474  rtsp_st->dynamic_handler->parse_sdp_a_line(s,
475  s->nb_streams - 1,
476  rtsp_st->dynamic_protocol_context, buf);
477  }
478  }
479  break;
480  }
481 }
482 
483 int ff_sdp_parse(AVFormatContext *s, const char *content)
484 {
485  RTSPState *rt = s->priv_data;
486  const char *p;
487  int letter;
488  /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
489  * contain long SDP lines containing complete ASF Headers (several
490  * kB) or arrays of MDPR (RM stream descriptor) headers plus
491  * "rulebooks" describing their properties. Therefore, the SDP line
492  * buffer is large.
493  *
494  * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
495  * in rtpdec_xiph.c. */
496  char buf[16384], *q;
497  SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
498 
499  memset(s1, 0, sizeof(SDPParseState));
500  p = content;
501  for (;;) {
502  p += strspn(p, SPACE_CHARS);
503  letter = *p;
504  if (letter == '\0')
505  break;
506  p++;
507  if (*p != '=')
508  goto next_line;
509  p++;
510  /* get the content */
511  q = buf;
512  while (*p != '\n' && *p != '\r' && *p != '\0') {
513  if ((q - buf) < sizeof(buf) - 1)
514  *q++ = *p;
515  p++;
516  }
517  *q = '\0';
518  sdp_parse_line(s, s1, letter, buf);
519  next_line:
520  while (*p != '\n' && *p != '\0')
521  p++;
522  if (*p == '\n')
523  p++;
524  }
525  rt->p = av_malloc(sizeof(struct pollfd)*2*(rt->nb_rtsp_streams+1));
526  if (!rt->p) return AVERROR(ENOMEM);
527  return 0;
528 }
529 #endif /* CONFIG_RTPDEC */
530 
532 {
533  RTSPState *rt = s->priv_data;
534  int i;
535 
536  for (i = 0; i < rt->nb_rtsp_streams; i++) {
537  RTSPStream *rtsp_st = rt->rtsp_streams[i];
538  if (!rtsp_st)
539  continue;
540  if (rtsp_st->transport_priv) {
541  if (s->oformat) {
542  AVFormatContext *rtpctx = rtsp_st->transport_priv;
543  av_write_trailer(rtpctx);
545  uint8_t *ptr;
546  avio_close_dyn_buf(rtpctx->pb, &ptr);
547  av_free(ptr);
548  } else {
549  avio_close(rtpctx->pb);
550  }
551  avformat_free_context(rtpctx);
552  } else if (rt->transport == RTSP_TRANSPORT_RDT && CONFIG_RTPDEC)
554  else if (CONFIG_RTPDEC)
556  }
557  rtsp_st->transport_priv = NULL;
558  if (rtsp_st->rtp_handle)
559  ffurl_close(rtsp_st->rtp_handle);
560  rtsp_st->rtp_handle = NULL;
561  }
562 }
563 
564 /* close and free RTSP streams */
566 {
567  RTSPState *rt = s->priv_data;
568  int i;
569  RTSPStream *rtsp_st;
570 
572  for (i = 0; i < rt->nb_rtsp_streams; i++) {
573  rtsp_st = rt->rtsp_streams[i];
574  if (rtsp_st) {
575  if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
576  rtsp_st->dynamic_handler->free(
577  rtsp_st->dynamic_protocol_context);
578  av_free(rtsp_st);
579  }
580  }
581  av_free(rt->rtsp_streams);
582  if (rt->asf_ctx) {
584  }
585  av_free(rt->p);
586  av_free(rt->recvbuf);
587 }
588 
590 {
591  RTSPState *rt = s->priv_data;
592  AVStream *st = NULL;
593 
594  /* open the RTP context */
595  if (rtsp_st->stream_index >= 0)
596  st = s->streams[rtsp_st->stream_index];
597  if (!st)
599 
600  if (s->oformat && CONFIG_RTSP_MUXER) {
601  rtsp_st->transport_priv = ff_rtp_chain_mux_open(s, st,
602  rtsp_st->rtp_handle,
604  /* Ownership of rtp_handle is passed to the rtp mux context */
605  rtsp_st->rtp_handle = NULL;
606  } else if (rt->transport == RTSP_TRANSPORT_RDT && CONFIG_RTPDEC)
607  rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
608  rtsp_st->dynamic_protocol_context,
609  rtsp_st->dynamic_handler);
610  else if (CONFIG_RTPDEC)
611  rtsp_st->transport_priv = ff_rtp_parse_open(s, st, rtsp_st->rtp_handle,
612  rtsp_st->sdp_payload_type,
615 
616  if (!rtsp_st->transport_priv) {
617  return AVERROR(ENOMEM);
618  } else if (rt->transport != RTSP_TRANSPORT_RDT && CONFIG_RTPDEC) {
619  if (rtsp_st->dynamic_handler) {
621  rtsp_st->dynamic_protocol_context,
622  rtsp_st->dynamic_handler);
623  }
624  }
625 
626  return 0;
627 }
628 
629 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
630 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
631 {
632  const char *p;
633  int v;
634 
635  p = *pp;
636  p += strspn(p, SPACE_CHARS);
637  v = strtol(p, (char **)&p, 10);
638  if (*p == '-') {
639  p++;
640  *min_ptr = v;
641  v = strtol(p, (char **)&p, 10);
642  *max_ptr = v;
643  } else {
644  *min_ptr = v;
645  *max_ptr = v;
646  }
647  *pp = p;
648 }
649 
650 /* XXX: only one transport specification is parsed */
651 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
652 {
653  char transport_protocol[16];
654  char profile[16];
655  char lower_transport[16];
656  char parameter[16];
657  RTSPTransportField *th;
658  char buf[256];
659 
660  reply->nb_transports = 0;
661 
662  for (;;) {
663  p += strspn(p, SPACE_CHARS);
664  if (*p == '\0')
665  break;
666 
667  th = &reply->transports[reply->nb_transports];
668 
669  get_word_sep(transport_protocol, sizeof(transport_protocol),
670  "/", &p);
671  if (!av_strcasecmp (transport_protocol, "rtp")) {
672  get_word_sep(profile, sizeof(profile), "/;,", &p);
673  lower_transport[0] = '\0';
674  /* rtp/avp/<protocol> */
675  if (*p == '/') {
676  get_word_sep(lower_transport, sizeof(lower_transport),
677  ";,", &p);
678  }
680  } else if (!av_strcasecmp (transport_protocol, "x-pn-tng") ||
681  !av_strcasecmp (transport_protocol, "x-real-rdt")) {
682  /* x-pn-tng/<protocol> */
683  get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
684  profile[0] = '\0';
686  }
687  if (!av_strcasecmp(lower_transport, "TCP"))
689  else
691 
692  if (*p == ';')
693  p++;
694  /* get each parameter */
695  while (*p != '\0' && *p != ',') {
696  get_word_sep(parameter, sizeof(parameter), "=;,", &p);
697  if (!strcmp(parameter, "port")) {
698  if (*p == '=') {
699  p++;
700  rtsp_parse_range(&th->port_min, &th->port_max, &p);
701  }
702  } else if (!strcmp(parameter, "client_port")) {
703  if (*p == '=') {
704  p++;
705  rtsp_parse_range(&th->client_port_min,
706  &th->client_port_max, &p);
707  }
708  } else if (!strcmp(parameter, "server_port")) {
709  if (*p == '=') {
710  p++;
711  rtsp_parse_range(&th->server_port_min,
712  &th->server_port_max, &p);
713  }
714  } else if (!strcmp(parameter, "interleaved")) {
715  if (*p == '=') {
716  p++;
717  rtsp_parse_range(&th->interleaved_min,
718  &th->interleaved_max, &p);
719  }
720  } else if (!strcmp(parameter, "multicast")) {
723  } else if (!strcmp(parameter, "ttl")) {
724  if (*p == '=') {
725  p++;
726  th->ttl = strtol(p, (char **)&p, 10);
727  }
728  } else if (!strcmp(parameter, "destination")) {
729  if (*p == '=') {
730  p++;
731  get_word_sep(buf, sizeof(buf), ";,", &p);
732  get_sockaddr(buf, &th->destination);
733  }
734  } else if (!strcmp(parameter, "source")) {
735  if (*p == '=') {
736  p++;
737  get_word_sep(buf, sizeof(buf), ";,", &p);
738  av_strlcpy(th->source, buf, sizeof(th->source));
739  }
740  }
741 
742  while (*p != ';' && *p != '\0' && *p != ',')
743  p++;
744  if (*p == ';')
745  p++;
746  }
747  if (*p == ',')
748  p++;
749 
750  reply->nb_transports++;
751  }
752 }
753 
754 static void handle_rtp_info(RTSPState *rt, const char *url,
755  uint32_t seq, uint32_t rtptime)
756 {
757  int i;
758  if (!rtptime || !url[0])
759  return;
760  if (rt->transport != RTSP_TRANSPORT_RTP)
761  return;
762  for (i = 0; i < rt->nb_rtsp_streams; i++) {
763  RTSPStream *rtsp_st = rt->rtsp_streams[i];
764  RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
765  if (!rtpctx)
766  continue;
767  if (!strcmp(rtsp_st->control_url, url)) {
768  rtpctx->base_timestamp = rtptime;
769  break;
770  }
771  }
772 }
773 
774 static void rtsp_parse_rtp_info(RTSPState *rt, const char *p)
775 {
776  int read = 0;
777  char key[20], value[1024], url[1024] = "";
778  uint32_t seq = 0, rtptime = 0;
779 
780  for (;;) {
781  p += strspn(p, SPACE_CHARS);
782  if (!*p)
783  break;
784  get_word_sep(key, sizeof(key), "=", &p);
785  if (*p != '=')
786  break;
787  p++;
788  get_word_sep(value, sizeof(value), ";, ", &p);
789  read++;
790  if (!strcmp(key, "url"))
791  av_strlcpy(url, value, sizeof(url));
792  else if (!strcmp(key, "seq"))
793  seq = strtoul(value, NULL, 10);
794  else if (!strcmp(key, "rtptime"))
795  rtptime = strtoul(value, NULL, 10);
796  if (*p == ',') {
797  handle_rtp_info(rt, url, seq, rtptime);
798  url[0] = '\0';
799  seq = rtptime = 0;
800  read = 0;
801  }
802  if (*p)
803  p++;
804  }
805  if (read > 0)
806  handle_rtp_info(rt, url, seq, rtptime);
807 }
808 
809 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
810  RTSPState *rt, const char *method)
811 {
812  const char *p;
813 
814  /* NOTE: we do case independent match for broken servers */
815  p = buf;
816  if (av_stristart(p, "Session:", &p)) {
817  int t;
818  get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
819  if (av_stristart(p, ";timeout=", &p) &&
820  (t = strtol(p, NULL, 10)) > 0) {
821  reply->timeout = t;
822  }
823  } else if (av_stristart(p, "Content-Length:", &p)) {
824  reply->content_length = strtol(p, NULL, 10);
825  } else if (av_stristart(p, "Transport:", &p)) {
826  rtsp_parse_transport(reply, p);
827  } else if (av_stristart(p, "CSeq:", &p)) {
828  reply->seq = strtol(p, NULL, 10);
829  } else if (av_stristart(p, "Range:", &p)) {
830  rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
831  } else if (av_stristart(p, "RealChallenge1:", &p)) {
832  p += strspn(p, SPACE_CHARS);
833  av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
834  } else if (av_stristart(p, "Server:", &p)) {
835  p += strspn(p, SPACE_CHARS);
836  av_strlcpy(reply->server, p, sizeof(reply->server));
837  } else if (av_stristart(p, "Notice:", &p) ||
838  av_stristart(p, "X-Notice:", &p)) {
839  reply->notice = strtol(p, NULL, 10);
840  } else if (av_stristart(p, "Location:", &p)) {
841  p += strspn(p, SPACE_CHARS);
842  av_strlcpy(reply->location, p , sizeof(reply->location));
843  } else if (av_stristart(p, "WWW-Authenticate:", &p) && rt) {
844  p += strspn(p, SPACE_CHARS);
845  ff_http_auth_handle_header(&rt->auth_state, "WWW-Authenticate", p);
846  } else if (av_stristart(p, "Authentication-Info:", &p) && rt) {
847  p += strspn(p, SPACE_CHARS);
848  ff_http_auth_handle_header(&rt->auth_state, "Authentication-Info", p);
849  } else if (av_stristart(p, "Content-Base:", &p) && rt) {
850  p += strspn(p, SPACE_CHARS);
851  if (method && !strcmp(method, "DESCRIBE"))
852  av_strlcpy(rt->control_uri, p , sizeof(rt->control_uri));
853  } else if (av_stristart(p, "RTP-Info:", &p) && rt) {
854  p += strspn(p, SPACE_CHARS);
855  if (method && !strcmp(method, "PLAY"))
856  rtsp_parse_rtp_info(rt, p);
857  } else if (av_stristart(p, "Public:", &p) && rt) {
858  if (strstr(p, "GET_PARAMETER") &&
859  method && !strcmp(method, "OPTIONS"))
860  rt->get_parameter_supported = 1;
861  } else if (av_stristart(p, "x-Accept-Dynamic-Rate:", &p) && rt) {
862  p += strspn(p, SPACE_CHARS);
863  rt->accept_dynamic_rate = atoi(p);
864  }
865 }
866 
867 /* skip a RTP/TCP interleaved packet */
869 {
870  RTSPState *rt = s->priv_data;
871  int ret, len, len1;
872  uint8_t buf[1024];
873 
874  ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
875  if (ret != 3)
876  return;
877  len = AV_RB16(buf + 1);
878 
879  av_dlog(s, "skipping RTP packet len=%d\n", len);
880 
881  /* skip payload */
882  while (len > 0) {
883  len1 = len;
884  if (len1 > sizeof(buf))
885  len1 = sizeof(buf);
886  ret = ffurl_read_complete(rt->rtsp_hd, buf, len1);
887  if (ret != len1)
888  return;
889  len -= len1;
890  }
891 }
892 
894  unsigned char **content_ptr,
895  int return_on_interleaved_data, const char *method)
896 {
897  RTSPState *rt = s->priv_data;
898  char buf[4096], buf1[1024], *q;
899  unsigned char ch;
900  const char *p;
901  int ret, content_length, line_count = 0;
902  unsigned char *content = NULL;
903 
904  memset(reply, 0, sizeof(*reply));
905 
906  /* parse reply (XXX: use buffers) */
907  rt->last_reply[0] = '\0';
908  for (;;) {
909  q = buf;
910  for (;;) {
911  ret = ffurl_read_complete(rt->rtsp_hd, &ch, 1);
912  av_dlog(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
913  if (ret != 1)
914  return AVERROR_EOF;
915  if (ch == '\n')
916  break;
917  if (ch == '$') {
918  /* XXX: only parse it if first char on line ? */
919  if (return_on_interleaved_data) {
920  return 1;
921  } else
923  } else if (ch != '\r') {
924  if ((q - buf) < sizeof(buf) - 1)
925  *q++ = ch;
926  }
927  }
928  *q = '\0';
929 
930  av_dlog(s, "line='%s'\n", buf);
931 
932  /* test if last line */
933  if (buf[0] == '\0')
934  break;
935  p = buf;
936  if (line_count == 0) {
937  /* get reply code */
938  get_word(buf1, sizeof(buf1), &p);
939  get_word(buf1, sizeof(buf1), &p);
940  reply->status_code = atoi(buf1);
941  av_strlcpy(reply->reason, p, sizeof(reply->reason));
942  } else {
943  ff_rtsp_parse_line(reply, p, rt, method);
944  av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
945  av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
946  }
947  line_count++;
948  }
949 
950  if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
951  av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
952 
953  content_length = reply->content_length;
954  if (content_length > 0) {
955  /* leave some room for a trailing '\0' (useful for simple parsing) */
956  content = av_malloc(content_length + 1);
957  ffurl_read_complete(rt->rtsp_hd, content, content_length);
958  content[content_length] = '\0';
959  }
960  if (content_ptr)
961  *content_ptr = content;
962  else
963  av_free(content);
964 
965  if (rt->seq != reply->seq) {
966  av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
967  rt->seq, reply->seq);
968  }
969 
970  /* EOS */
971  if (reply->notice == 2101 /* End-of-Stream Reached */ ||
972  reply->notice == 2104 /* Start-of-Stream Reached */ ||
973  reply->notice == 2306 /* Continuous Feed Terminated */) {
974  rt->state = RTSP_STATE_IDLE;
975  } else if (reply->notice >= 4400 && reply->notice < 5500) {
976  return AVERROR(EIO); /* data or server error */
977  } else if (reply->notice == 2401 /* Ticket Expired */ ||
978  (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
979  return AVERROR(EPERM);
980 
981  return 0;
982 }
983 
997 static int ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
998  const char *method, const char *url,
999  const char *headers,
1000  const unsigned char *send_content,
1001  int send_content_length)
1002 {
1003  RTSPState *rt = s->priv_data;
1004  char buf[4096], *out_buf;
1005  char base64buf[AV_BASE64_SIZE(sizeof(buf))];
1006 
1007  /* Add in RTSP headers */
1008  out_buf = buf;
1009  rt->seq++;
1010  snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
1011  if (headers)
1012  av_strlcat(buf, headers, sizeof(buf));
1013  av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
1014  if (rt->session_id[0] != '\0' && (!headers ||
1015  !strstr(headers, "\nIf-Match:"))) {
1016  av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
1017  }
1018  if (rt->auth[0]) {
1019  char *str = ff_http_auth_create_response(&rt->auth_state,
1020  rt->auth, url, method);
1021  if (str)
1022  av_strlcat(buf, str, sizeof(buf));
1023  av_free(str);
1024  }
1025  if (send_content_length > 0 && send_content)
1026  av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
1027  av_strlcat(buf, "\r\n", sizeof(buf));
1028 
1029  /* base64 encode rtsp if tunneling */
1030  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1031  av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
1032  out_buf = base64buf;
1033  }
1034 
1035  av_dlog(s, "Sending:\n%s--\n", buf);
1036 
1037  ffurl_write(rt->rtsp_hd_out, out_buf, strlen(out_buf));
1038  if (send_content_length > 0 && send_content) {
1039  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1040  av_log(s, AV_LOG_ERROR, "tunneling of RTSP requests "
1041  "with content data not supported\n");
1042  return AVERROR_PATCHWELCOME;
1043  }
1044  ffurl_write(rt->rtsp_hd_out, send_content, send_content_length);
1045  }
1046  rt->last_cmd_time = av_gettime();
1047 
1048  return 0;
1049 }
1050 
1051 int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
1052  const char *url, const char *headers)
1053 {
1054  return ff_rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
1055 }
1056 
1057 int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
1058  const char *headers, RTSPMessageHeader *reply,
1059  unsigned char **content_ptr)
1060 {
1061  return ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
1062  content_ptr, NULL, 0);
1063 }
1064 
1066  const char *method, const char *url,
1067  const char *header,
1068  RTSPMessageHeader *reply,
1069  unsigned char **content_ptr,
1070  const unsigned char *send_content,
1071  int send_content_length)
1072 {
1073  RTSPState *rt = s->priv_data;
1074  HTTPAuthType cur_auth_type;
1075  int ret;
1076 
1077 retry:
1078  cur_auth_type = rt->auth_state.auth_type;
1079  if ((ret = ff_rtsp_send_cmd_with_content_async(s, method, url, header,
1080  send_content,
1081  send_content_length)))
1082  return ret;
1083 
1084  if ((ret = ff_rtsp_read_reply(s, reply, content_ptr, 0, method) ) < 0)
1085  return ret;
1086 
1087  if (reply->status_code == 401 && cur_auth_type == HTTP_AUTH_NONE &&
1089  goto retry;
1090 
1091  if (reply->status_code > 400){
1092  av_log(s, AV_LOG_ERROR, "method %s failed: %d%s\n",
1093  method,
1094  reply->status_code,
1095  reply->reason);
1096  av_log(s, AV_LOG_DEBUG, "%s\n", rt->last_reply);
1097  }
1098 
1099  return 0;
1100 }
1101 
1102 int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
1103  int lower_transport, const char *real_challenge)
1104 {
1105  RTSPState *rt = s->priv_data;
1106  int rtx = 0, j, i, err, interleave = 0;
1107  RTSPStream *rtsp_st;
1108  RTSPMessageHeader reply1, *reply = &reply1;
1109  char cmd[2048];
1110  const char *trans_pref;
1111 
1112  if (rt->transport == RTSP_TRANSPORT_RDT)
1113  trans_pref = "x-pn-tng";
1114  else
1115  trans_pref = "RTP/AVP";
1116 
1117  /* default timeout: 1 minute */
1118  rt->timeout = 60;
1119 
1120  /* for each stream, make the setup request */
1121  /* XXX: we assume the same server is used for the control of each
1122  * RTSP stream */
1123 
1124  for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1125  char transport[2048];
1126 
1127  /*
1128  * WMS serves all UDP data over a single connection, the RTX, which
1129  * isn't necessarily the first in the SDP but has to be the first
1130  * to be set up, else the second/third SETUP will fail with a 461.
1131  */
1132  if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1133  rt->server_type == RTSP_SERVER_WMS) {
1134  if (i == 0) {
1135  /* rtx first */
1136  for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1137  int len = strlen(rt->rtsp_streams[rtx]->control_url);
1138  if (len >= 4 &&
1139  !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1140  "/rtx"))
1141  break;
1142  }
1143  if (rtx == rt->nb_rtsp_streams)
1144  return -1; /* no RTX found */
1145  rtsp_st = rt->rtsp_streams[rtx];
1146  } else
1147  rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1148  } else
1149  rtsp_st = rt->rtsp_streams[i];
1150 
1151  /* RTP/UDP */
1152  if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1153  char buf[256];
1154 
1155  if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1156  port = reply->transports[0].client_port_min;
1157  goto have_port;
1158  }
1159 
1160  /* first try in specified port range */
1161  if (RTSP_RTP_PORT_MIN != 0) {
1162  while (j <= RTSP_RTP_PORT_MAX) {
1163  ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1164  "?localport=%d", j);
1165  /* we will use two ports per rtp stream (rtp and rtcp) */
1166  j += 2;
1167  if (ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
1168  &s->interrupt_callback, NULL) == 0)
1169  goto rtp_opened;
1170  }
1171  }
1172 
1173  av_log(s, AV_LOG_ERROR, "Unable to open an input RTP port\n");
1174  err = AVERROR(EIO);
1175  goto fail;
1176 
1177  rtp_opened:
1178  port = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
1179  have_port:
1180  snprintf(transport, sizeof(transport) - 1,
1181  "%s/UDP;", trans_pref);
1182  if (rt->server_type != RTSP_SERVER_REAL)
1183  av_strlcat(transport, "unicast;", sizeof(transport));
1184  av_strlcatf(transport, sizeof(transport),
1185  "client_port=%d", port);
1186  if (rt->transport == RTSP_TRANSPORT_RTP &&
1187  !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1188  av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1189  }
1190 
1191  /* RTP/TCP */
1192  else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1193  /* For WMS streams, the application streams are only used for
1194  * UDP. When trying to set it up for TCP streams, the server
1195  * will return an error. Therefore, we skip those streams. */
1196  if (rt->server_type == RTSP_SERVER_WMS &&
1197  s->streams[rtsp_st->stream_index]->codec->codec_type ==
1199  continue;
1200  snprintf(transport, sizeof(transport) - 1,
1201  "%s/TCP;", trans_pref);
1202  if (rt->transport != RTSP_TRANSPORT_RDT)
1203  av_strlcat(transport, "unicast;", sizeof(transport));
1204  av_strlcatf(transport, sizeof(transport),
1205  "interleaved=%d-%d",
1206  interleave, interleave + 1);
1207  interleave += 2;
1208  }
1209 
1210  else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1211  snprintf(transport, sizeof(transport) - 1,
1212  "%s/UDP;multicast", trans_pref);
1213  }
1214  if (s->oformat) {
1215  av_strlcat(transport, ";mode=receive", sizeof(transport));
1216  } else if (rt->server_type == RTSP_SERVER_REAL ||
1218  av_strlcat(transport, ";mode=play", sizeof(transport));
1219  snprintf(cmd, sizeof(cmd),
1220  "Transport: %s\r\n",
1221  transport);
1222  if (rt->accept_dynamic_rate)
1223  av_strlcat(cmd, "x-Dynamic-Rate: 0\r\n", sizeof(cmd));
1224  if (i == 0 && rt->server_type == RTSP_SERVER_REAL && CONFIG_RTPDEC) {
1225  char real_res[41], real_csum[9];
1226  ff_rdt_calc_response_and_checksum(real_res, real_csum,
1227  real_challenge);
1228  av_strlcatf(cmd, sizeof(cmd),
1229  "If-Match: %s\r\n"
1230  "RealChallenge2: %s, sd=%s\r\n",
1231  rt->session_id, real_res, real_csum);
1232  }
1233  ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1234  if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1235  err = 1;
1236  goto fail;
1237  } else if (reply->status_code != RTSP_STATUS_OK ||
1238  reply->nb_transports != 1) {
1239  err = AVERROR_INVALIDDATA;
1240  goto fail;
1241  }
1242 
1243  /* XXX: same protocol for all streams is required */
1244  if (i > 0) {
1245  if (reply->transports[0].lower_transport != rt->lower_transport ||
1246  reply->transports[0].transport != rt->transport) {
1247  err = AVERROR_INVALIDDATA;
1248  goto fail;
1249  }
1250  } else {
1251  rt->lower_transport = reply->transports[0].lower_transport;
1252  rt->transport = reply->transports[0].transport;
1253  }
1254 
1255  /* Fail if the server responded with another lower transport mode
1256  * than what we requested. */
1257  if (reply->transports[0].lower_transport != lower_transport) {
1258  av_log(s, AV_LOG_ERROR, "Nonmatching transport in server reply\n");
1259  err = AVERROR_INVALIDDATA;
1260  goto fail;
1261  }
1262 
1263  switch(reply->transports[0].lower_transport) {
1265  rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1266  rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1267  break;
1268 
1269  case RTSP_LOWER_TRANSPORT_UDP: {
1270  char url[1024], options[30] = "";
1271 
1272  if (rt->rtsp_flags & RTSP_FLAG_FILTER_SRC)
1273  av_strlcpy(options, "?connect=1", sizeof(options));
1274  /* Use source address if specified */
1275  if (reply->transports[0].source[0]) {
1276  ff_url_join(url, sizeof(url), "rtp", NULL,
1277  reply->transports[0].source,
1278  reply->transports[0].server_port_min, "%s", options);
1279  } else {
1280  ff_url_join(url, sizeof(url), "rtp", NULL, host,
1281  reply->transports[0].server_port_min, "%s", options);
1282  }
1283  if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1284  ff_rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1285  err = AVERROR_INVALIDDATA;
1286  goto fail;
1287  }
1288  /* Try to initialize the connection state in a
1289  * potential NAT router by sending dummy packets.
1290  * RTP/RTCP dummy packets are used for RDT, too.
1291  */
1292  if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat &&
1293  CONFIG_RTPDEC)
1295  break;
1296  }
1298  char url[1024], namebuf[50];
1299  struct sockaddr_storage addr;
1300  int port, ttl;
1301 
1302  if (reply->transports[0].destination.ss_family) {
1303  addr = reply->transports[0].destination;
1304  port = reply->transports[0].port_min;
1305  ttl = reply->transports[0].ttl;
1306  } else {
1307  addr = rtsp_st->sdp_ip;
1308  port = rtsp_st->sdp_port;
1309  ttl = rtsp_st->sdp_ttl;
1310  }
1311  getnameinfo((struct sockaddr*) &addr, sizeof(addr),
1312  namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
1313  ff_url_join(url, sizeof(url), "rtp", NULL, namebuf,
1314  port, "?ttl=%d", ttl);
1315  if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
1316  &s->interrupt_callback, NULL) < 0) {
1317  err = AVERROR_INVALIDDATA;
1318  goto fail;
1319  }
1320  break;
1321  }
1322  }
1323 
1324  if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1325  goto fail;
1326  }
1327 
1328  if (reply->timeout > 0)
1329  rt->timeout = reply->timeout;
1330 
1331  if (rt->server_type == RTSP_SERVER_REAL)
1332  rt->need_subscription = 1;
1333 
1334  return 0;
1335 
1336 fail:
1337  ff_rtsp_undo_setup(s);
1338  return err;
1339 }
1340 
1342 {
1343  RTSPState *rt = s->priv_data;
1344  if (rt->rtsp_hd_out != rt->rtsp_hd) ffurl_close(rt->rtsp_hd_out);
1345  ffurl_close(rt->rtsp_hd);
1346  rt->rtsp_hd = rt->rtsp_hd_out = NULL;
1347 }
1348 
1350 {
1351  RTSPState *rt = s->priv_data;
1352  char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1353  char *option_list, *option, *filename;
1354  int port, err, tcp_fd;
1355  RTSPMessageHeader reply1 = {0}, *reply = &reply1;
1356  int lower_transport_mask = 0;
1357  char real_challenge[64] = "";
1358  struct sockaddr_storage peer;
1359  socklen_t peer_len = sizeof(peer);
1360 
1361  if (!ff_network_init())
1362  return AVERROR(EIO);
1363 
1368  }
1369  /* Only pass through valid flags from here */
1371 
1372 redirect:
1373  lower_transport_mask = rt->lower_transport_mask;
1374  /* extract hostname and port */
1375  av_url_split(NULL, 0, auth, sizeof(auth),
1376  host, sizeof(host), &port, path, sizeof(path), s->filename);
1377  if (*auth) {
1378  av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1379  }
1380  if (port < 0)
1381  port = RTSP_DEFAULT_PORT;
1382 
1383 #if FF_API_RTSP_URL_OPTIONS
1384  /* search for options */
1385  option_list = strrchr(path, '?');
1386  if (option_list) {
1387  /* Strip out the RTSP specific options, write out the rest of
1388  * the options back into the same string. */
1389  filename = option_list;
1390  while (option_list) {
1391  int handled = 1;
1392  /* move the option pointer */
1393  option = ++option_list;
1394  option_list = strchr(option_list, '&');
1395  if (option_list)
1396  *option_list = 0;
1397 
1398  /* handle the options */
1399  if (!strcmp(option, "udp")) {
1400  lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP);
1401  } else if (!strcmp(option, "multicast")) {
1402  lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1403  } else if (!strcmp(option, "tcp")) {
1404  lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1405  } else if(!strcmp(option, "http")) {
1406  lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1408  } else if (!strcmp(option, "filter_src")) {
1410  } else {
1411  /* Write options back into the buffer, using memmove instead
1412  * of strcpy since the strings may overlap. */
1413  int len = strlen(option);
1414  memmove(++filename, option, len);
1415  filename += len;
1416  if (option_list) *filename = '&';
1417  handled = 0;
1418  }
1419  if (handled)
1420  av_log(s, AV_LOG_WARNING, "Options passed via URL are "
1421  "deprecated, use -rtsp_transport "
1422  "and -rtsp_flags instead.\n");
1423  }
1424  *filename = 0;
1425  }
1426 #endif
1427 
1428  if (!lower_transport_mask)
1429  lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1430 
1431  if (s->oformat) {
1432  /* Only UDP or TCP - UDP multicast isn't supported. */
1433  lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1434  (1 << RTSP_LOWER_TRANSPORT_TCP);
1435  if (!lower_transport_mask || rt->control_transport == RTSP_MODE_TUNNEL) {
1436  av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1437  "only UDP and TCP are supported for output.\n");
1438  err = AVERROR(EINVAL);
1439  goto fail;
1440  }
1441  }
1442 
1443  /* Construct the URI used in request; this is similar to s->filename,
1444  * but with authentication credentials removed and RTSP specific options
1445  * stripped out. */
1446  ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1447  host, port, "%s", path);
1448 
1449  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1450  /* set up initial handshake for tunneling */
1451  char httpname[1024];
1452  char sessioncookie[17];
1453  char headers[1024];
1454 
1455  ff_url_join(httpname, sizeof(httpname), "http", auth, host, port, "%s", path);
1456  snprintf(sessioncookie, sizeof(sessioncookie), "%08x%08x",
1458 
1459  /* GET requests */
1460  if (ffurl_alloc(&rt->rtsp_hd, httpname, AVIO_FLAG_READ,
1461  &s->interrupt_callback) < 0) {
1462  err = AVERROR(EIO);
1463  goto fail;
1464  }
1465 
1466  /* generate GET headers */
1467  snprintf(headers, sizeof(headers),
1468  "x-sessioncookie: %s\r\n"
1469  "Accept: application/x-rtsp-tunnelled\r\n"
1470  "Pragma: no-cache\r\n"
1471  "Cache-Control: no-cache\r\n",
1472  sessioncookie);
1473  av_opt_set(rt->rtsp_hd->priv_data, "headers", headers, 0);
1474 
1475  /* complete the connection */
1476  if (ffurl_connect(rt->rtsp_hd, NULL)) {
1477  err = AVERROR(EIO);
1478  goto fail;
1479  }
1480 
1481  /* POST requests */
1482  if (ffurl_alloc(&rt->rtsp_hd_out, httpname, AVIO_FLAG_WRITE,
1483  &s->interrupt_callback) < 0 ) {
1484  err = AVERROR(EIO);
1485  goto fail;
1486  }
1487 
1488  /* generate POST headers */
1489  snprintf(headers, sizeof(headers),
1490  "x-sessioncookie: %s\r\n"
1491  "Content-Type: application/x-rtsp-tunnelled\r\n"
1492  "Pragma: no-cache\r\n"
1493  "Cache-Control: no-cache\r\n"
1494  "Content-Length: 32767\r\n"
1495  "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
1496  sessioncookie);
1497  av_opt_set(rt->rtsp_hd_out->priv_data, "headers", headers, 0);
1498  av_opt_set(rt->rtsp_hd_out->priv_data, "chunked_post", "0", 0);
1499 
1500  /* Initialize the authentication state for the POST session. The HTTP
1501  * protocol implementation doesn't properly handle multi-pass
1502  * authentication for POST requests, since it would require one of
1503  * the following:
1504  * - implementing Expect: 100-continue, which many HTTP servers
1505  * don't support anyway, even less the RTSP servers that do HTTP
1506  * tunneling
1507  * - sending the whole POST data until getting a 401 reply specifying
1508  * what authentication method to use, then resending all that data
1509  * - waiting for potential 401 replies directly after sending the
1510  * POST header (waiting for some unspecified time)
1511  * Therefore, we copy the full auth state, which works for both basic
1512  * and digest. (For digest, we would have to synchronize the nonce
1513  * count variable between the two sessions, if we'd do more requests
1514  * with the original session, though.)
1515  */
1517 
1518  /* complete the connection */
1519  if (ffurl_connect(rt->rtsp_hd_out, NULL)) {
1520  err = AVERROR(EIO);
1521  goto fail;
1522  }
1523  } else {
1524  /* open the tcp connection */
1525  ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
1526  if (ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
1527  &s->interrupt_callback, NULL) < 0) {
1528  err = AVERROR(EIO);
1529  goto fail;
1530  }
1531  rt->rtsp_hd_out = rt->rtsp_hd;
1532  }
1533  rt->seq = 0;
1534 
1535  tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
1536  if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1537  getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1538  NULL, 0, NI_NUMERICHOST);
1539  }
1540 
1541  /* request options supported by the server; this also detects server
1542  * type */
1543  for (rt->server_type = RTSP_SERVER_RTP;;) {
1544  cmd[0] = 0;
1545  if (rt->server_type == RTSP_SERVER_REAL)
1546  av_strlcat(cmd,
1547  /*
1548  * The following entries are required for proper
1549  * streaming from a Realmedia server. They are
1550  * interdependent in some way although we currently
1551  * don't quite understand how. Values were copied
1552  * from mplayer SVN r23589.
1553  * ClientChallenge is a 16-byte ID in hex
1554  * CompanyID is a 16-byte ID in base64
1555  */
1556  "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1557  "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1558  "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1559  "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1560  sizeof(cmd));
1561  ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1562  if (reply->status_code != RTSP_STATUS_OK) {
1563  err = AVERROR_INVALIDDATA;
1564  goto fail;
1565  }
1566 
1567  /* detect server type if not standard-compliant RTP */
1568  if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1570  continue;
1571  } else if (!av_strncasecmp(reply->server, "WMServer/", 9)) {
1573  } else if (rt->server_type == RTSP_SERVER_REAL)
1574  strcpy(real_challenge, reply->real_challenge);
1575  break;
1576  }
1577 
1578  if (s->iformat && CONFIG_RTSP_DEMUXER)
1579  err = ff_rtsp_setup_input_streams(s, reply);
1580  else if (CONFIG_RTSP_MUXER)
1581  err = ff_rtsp_setup_output_streams(s, host);
1582  if (err)
1583  goto fail;
1584 
1585  do {
1586  int lower_transport = ff_log2_tab[lower_transport_mask &
1587  ~(lower_transport_mask - 1)];
1588 
1589  err = ff_rtsp_make_setup_request(s, host, port, lower_transport,
1590  rt->server_type == RTSP_SERVER_REAL ?
1591  real_challenge : NULL);
1592  if (err < 0)
1593  goto fail;
1594  lower_transport_mask &= ~(1 << lower_transport);
1595  if (lower_transport_mask == 0 && err == 1) {
1596  err = AVERROR(EPROTONOSUPPORT);
1597  goto fail;
1598  }
1599  } while (err);
1600 
1601  rt->lower_transport_mask = lower_transport_mask;
1602  av_strlcpy(rt->real_challenge, real_challenge, sizeof(rt->real_challenge));
1603  rt->state = RTSP_STATE_IDLE;
1604  rt->seek_timestamp = 0; /* default is to start stream at position zero */
1605  return 0;
1606  fail:
1609  if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1610  av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1611  av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1612  reply->status_code,
1613  s->filename);
1614  goto redirect;
1615  }
1616  ff_network_close();
1617  return err;
1618 }
1619 #endif /* CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER */
1620 
1621 #if CONFIG_RTPDEC
1622 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1623  uint8_t *buf, int buf_size, int64_t wait_end)
1624 {
1625  RTSPState *rt = s->priv_data;
1626  RTSPStream *rtsp_st;
1627  int n, i, ret, tcp_fd, timeout_cnt = 0;
1628  int max_p = 0;
1629  struct pollfd *p = rt->p;
1630 
1631  for (;;) {
1633  return AVERROR_EXIT;
1634  if (wait_end && wait_end - av_gettime() < 0)
1635  return AVERROR(EAGAIN);
1636  max_p = 0;
1637  if (rt->rtsp_hd) {
1638  tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
1639  p[max_p].fd = tcp_fd;
1640  p[max_p++].events = POLLIN;
1641  } else {
1642  tcp_fd = -1;
1643  }
1644  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1645  rtsp_st = rt->rtsp_streams[i];
1646  if (rtsp_st->rtp_handle) {
1647  p[max_p].fd = ffurl_get_file_handle(rtsp_st->rtp_handle);
1648  p[max_p++].events = POLLIN;
1649  p[max_p].fd = ff_rtp_get_rtcp_file_handle(rtsp_st->rtp_handle);
1650  p[max_p++].events = POLLIN;
1651  }
1652  }
1653  n = poll(p, max_p, POLL_TIMEOUT_MS);
1654  if (n > 0) {
1655  int j = 1 - (tcp_fd == -1);
1656  timeout_cnt = 0;
1657  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1658  rtsp_st = rt->rtsp_streams[i];
1659  if (rtsp_st->rtp_handle) {
1660  if (p[j].revents & POLLIN || p[j+1].revents & POLLIN) {
1661  ret = ffurl_read(rtsp_st->rtp_handle, buf, buf_size);
1662  if (ret > 0) {
1663  *prtsp_st = rtsp_st;
1664  return ret;
1665  }
1666  }
1667  j+=2;
1668  }
1669  }
1670 #if CONFIG_RTSP_DEMUXER
1671  if (tcp_fd != -1 && p[0].revents & POLLIN) {
1672  RTSPMessageHeader reply;
1673 
1674  ret = ff_rtsp_read_reply(s, &reply, NULL, 0, NULL);
1675  if (ret < 0)
1676  return ret;
1677  /* XXX: parse message */
1678  if (rt->state != RTSP_STATE_STREAMING)
1679  return 0;
1680  }
1681 #endif
1682  } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1683  return AVERROR(ETIMEDOUT);
1684  } else if (n < 0 && errno != EINTR)
1685  return AVERROR(errno);
1686  }
1687 }
1688 
1690 {
1691  RTSPState *rt = s->priv_data;
1692  int ret, len;
1693  RTSPStream *rtsp_st, *first_queue_st = NULL;
1694  int64_t wait_end = 0;
1695 
1696  if (rt->nb_byes == rt->nb_rtsp_streams)
1697  return AVERROR_EOF;
1698 
1699  /* get next frames from the same RTP packet */
1700  if (rt->cur_transport_priv) {
1701  if (rt->transport == RTSP_TRANSPORT_RDT) {
1702  ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1703  } else
1704  ret = ff_rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1705  if (ret == 0) {
1706  rt->cur_transport_priv = NULL;
1707  return 0;
1708  } else if (ret == 1) {
1709  return 0;
1710  } else
1711  rt->cur_transport_priv = NULL;
1712  }
1713 
1714 redo:
1715  if (rt->transport == RTSP_TRANSPORT_RTP) {
1716  int i;
1717  int64_t first_queue_time = 0;
1718  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1719  RTPDemuxContext *rtpctx = rt->rtsp_streams[i]->transport_priv;
1720  int64_t queue_time;
1721  if (!rtpctx)
1722  continue;
1723  queue_time = ff_rtp_queued_packet_time(rtpctx);
1724  if (queue_time && (queue_time - first_queue_time < 0 ||
1725  !first_queue_time)) {
1726  first_queue_time = queue_time;
1727  first_queue_st = rt->rtsp_streams[i];
1728  }
1729  }
1730  if (first_queue_time) {
1731  wait_end = first_queue_time + s->max_delay;
1732  } else {
1733  wait_end = 0;
1734  first_queue_st = NULL;
1735  }
1736  }
1737 
1738  /* read next RTP packet */
1739  if (!rt->recvbuf) {
1741  if (!rt->recvbuf)
1742  return AVERROR(ENOMEM);
1743  }
1744 
1745  switch(rt->lower_transport) {
1746  default:
1747 #if CONFIG_RTSP_DEMUXER
1749  len = ff_rtsp_tcp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE);
1750  break;
1751 #endif
1754  len = udp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE, wait_end);
1755  if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1757  break;
1758  }
1759  if (len == AVERROR(EAGAIN) && first_queue_st &&
1760  rt->transport == RTSP_TRANSPORT_RTP) {
1761  rtsp_st = first_queue_st;
1762  ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, NULL, 0);
1763  goto end;
1764  }
1765  if (len < 0)
1766  return len;
1767  if (len == 0)
1768  return AVERROR_EOF;
1769  if (rt->transport == RTSP_TRANSPORT_RDT) {
1770  ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
1771  } else {
1772  ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
1773  if (ret < 0) {
1774  /* Either bad packet, or a RTCP packet. Check if the
1775  * first_rtcp_ntp_time field was initialized. */
1776  RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1777  if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
1778  /* first_rtcp_ntp_time has been initialized for this stream,
1779  * copy the same value to all other uninitialized streams,
1780  * in order to map their timestamp origin to the same ntp time
1781  * as this one. */
1782  int i;
1783  AVStream *st = NULL;
1784  if (rtsp_st->stream_index >= 0)
1785  st = s->streams[rtsp_st->stream_index];
1786  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1787  RTPDemuxContext *rtpctx2 = rt->rtsp_streams[i]->transport_priv;
1788  AVStream *st2 = NULL;
1789  if (rt->rtsp_streams[i]->stream_index >= 0)
1790  st2 = s->streams[rt->rtsp_streams[i]->stream_index];
1791  if (rtpctx2 && st && st2 &&
1792  rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
1793  rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
1794  rtpctx2->rtcp_ts_offset = av_rescale_q(
1795  rtpctx->rtcp_ts_offset, st->time_base,
1796  st2->time_base);
1797  }
1798  }
1799  }
1800  if (ret == -RTCP_BYE) {
1801  rt->nb_byes++;
1802 
1803  av_log(s, AV_LOG_DEBUG, "Received BYE for stream %d (%d/%d)\n",
1804  rtsp_st->stream_index, rt->nb_byes, rt->nb_rtsp_streams);
1805 
1806  if (rt->nb_byes == rt->nb_rtsp_streams)
1807  return AVERROR_EOF;
1808  }
1809  }
1810  }
1811 end:
1812  if (ret < 0)
1813  goto redo;
1814  if (ret == 1)
1815  /* more packets may follow, so we save the RTP context */
1816  rt->cur_transport_priv = rtsp_st->transport_priv;
1817 
1818  return ret;
1819 }
1820 #endif /* CONFIG_RTPDEC */
1821 
1822 #if CONFIG_SDP_DEMUXER
1823 static int sdp_probe(AVProbeData *p1)
1824 {
1825  const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1826 
1827  /* we look for a line beginning "c=IN IP" */
1828  while (p < p_end && *p != '\0') {
1829  if (p + sizeof("c=IN IP") - 1 < p_end &&
1830  av_strstart(p, "c=IN IP", NULL))
1831  return AVPROBE_SCORE_MAX / 2;
1832 
1833  while (p < p_end - 1 && *p != '\n') p++;
1834  if (++p >= p_end)
1835  break;
1836  if (*p == '\r')
1837  p++;
1838  }
1839  return 0;
1840 }
1841 
1842 static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
1843 {
1844  RTSPState *rt = s->priv_data;
1845  RTSPStream *rtsp_st;
1846  int size, i, err;
1847  char *content;
1848  char url[1024];
1849 
1850  if (!ff_network_init())
1851  return AVERROR(EIO);
1852 
1853  /* read the whole sdp file */
1854  /* XXX: better loading */
1855  content = av_malloc(SDP_MAX_SIZE);
1856  size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);
1857  if (size <= 0) {
1858  av_free(content);
1859  return AVERROR_INVALIDDATA;
1860  }
1861  content[size] ='\0';
1862 
1863  err = ff_sdp_parse(s, content);
1864  av_free(content);
1865  if (err) goto fail;
1866 
1867  /* open each RTP stream */
1868  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1869  char namebuf[50];
1870  rtsp_st = rt->rtsp_streams[i];
1871 
1872  getnameinfo((struct sockaddr*) &rtsp_st->sdp_ip, sizeof(rtsp_st->sdp_ip),
1873  namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
1874  ff_url_join(url, sizeof(url), "rtp", NULL,
1875  namebuf, rtsp_st->sdp_port,
1876  "?localport=%d&ttl=%d&connect=%d", rtsp_st->sdp_port,
1877  rtsp_st->sdp_ttl,
1878  rt->rtsp_flags & RTSP_FLAG_FILTER_SRC ? 1 : 0);
1879  if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
1880  &s->interrupt_callback, NULL) < 0) {
1881  err = AVERROR_INVALIDDATA;
1882  goto fail;
1883  }
1884  if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1885  goto fail;
1886  }
1887  return 0;
1888 fail:
1890  ff_network_close();
1891  return err;
1892 }
1893 
1894 static int sdp_read_close(AVFormatContext *s)
1895 {
1897  ff_network_close();
1898  return 0;
1899 }
1900 
1901 static const AVClass sdp_demuxer_class = {
1902  .class_name = "SDP demuxer",
1903  .item_name = av_default_item_name,
1904  .option = sdp_options,
1905  .version = LIBAVUTIL_VERSION_INT,
1906 };
1907 
1908 AVInputFormat ff_sdp_demuxer = {
1909  .name = "sdp",
1910  .long_name = NULL_IF_CONFIG_SMALL("SDP"),
1911  .priv_data_size = sizeof(RTSPState),
1912  .read_probe = sdp_probe,
1913  .read_header = sdp_read_header,
1915  .read_close = sdp_read_close,
1916  .priv_class = &sdp_demuxer_class
1917 };
1918 #endif /* CONFIG_SDP_DEMUXER */
1919 
1920 #if CONFIG_RTP_DEMUXER
1921 static int rtp_probe(AVProbeData *p)
1922 {
1923  if (av_strstart(p->filename, "rtp:", NULL))
1924  return AVPROBE_SCORE_MAX;
1925  return 0;
1926 }
1927 
1928 static int rtp_read_header(AVFormatContext *s,
1929  AVFormatParameters *ap)
1930 {
1931  uint8_t recvbuf[1500];
1932  char host[500], sdp[500];
1933  int ret, port;
1934  URLContext* in = NULL;
1935  int payload_type;
1936  AVCodecContext codec;
1937  struct sockaddr_storage addr;
1938  AVIOContext pb;
1939  socklen_t addrlen = sizeof(addr);
1940  RTSPState *rt = s->priv_data;
1941 
1942  if (!ff_network_init())
1943  return AVERROR(EIO);
1944 
1945  ret = ffurl_open(&in, s->filename, AVIO_FLAG_READ,
1946  &s->interrupt_callback, NULL);
1947  if (ret)
1948  goto fail;
1949 
1950  while (1) {
1951  ret = ffurl_read(in, recvbuf, sizeof(recvbuf));
1952  if (ret == AVERROR(EAGAIN))
1953  continue;
1954  if (ret < 0)
1955  goto fail;
1956  if (ret < 12) {
1957  av_log(s, AV_LOG_WARNING, "Received too short packet\n");
1958  continue;
1959  }
1960 
1961  if ((recvbuf[0] & 0xc0) != 0x80) {
1962  av_log(s, AV_LOG_WARNING, "Unsupported RTP version packet "
1963  "received\n");
1964  continue;
1965  }
1966 
1967  payload_type = recvbuf[1] & 0x7f;
1968  break;
1969  }
1970  getsockname(ffurl_get_file_handle(in), (struct sockaddr*) &addr, &addrlen);
1971  ffurl_close(in);
1972  in = NULL;
1973 
1974  memset(&codec, 0, sizeof(codec));
1975  if (ff_rtp_get_codec_info(&codec, payload_type)) {
1976  av_log(s, AV_LOG_ERROR, "Unable to receive RTP payload type %d "
1977  "without an SDP file describing it\n",
1978  payload_type);
1979  goto fail;
1980  }
1981  if (codec.codec_type != AVMEDIA_TYPE_DATA) {
1982  av_log(s, AV_LOG_WARNING, "Guessing on RTP content - if not received "
1983  "properly you need an SDP file "
1984  "describing it\n");
1985  }
1986 
1987  av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port,
1988  NULL, 0, s->filename);
1989 
1990  snprintf(sdp, sizeof(sdp),
1991  "v=0\r\nc=IN IP%d %s\r\nm=%s %d RTP/AVP %d\r\n",
1992  addr.ss_family == AF_INET ? 4 : 6, host,
1993  codec.codec_type == AVMEDIA_TYPE_DATA ? "application" :
1994  codec.codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio",
1995  port, payload_type);
1996  av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
1997 
1998  ffio_init_context(&pb, sdp, strlen(sdp), 0, NULL, NULL, NULL, NULL);
1999  s->pb = &pb;
2000 
2001  /* sdp_read_header initializes this again */
2002  ff_network_close();
2003 
2004  rt->media_type_mask = (1 << (AVMEDIA_TYPE_DATA+1)) - 1;
2005 
2006  ret = sdp_read_header(s, ap);
2007  s->pb = NULL;
2008  return ret;
2009 
2010 fail:
2011  if (in)
2012  ffurl_close(in);
2013  ff_network_close();
2014  return ret;
2015 }
2016 
2017 static const AVClass rtp_demuxer_class = {
2018  .class_name = "RTP demuxer",
2019  .item_name = av_default_item_name,
2020  .option = rtp_options,
2021  .version = LIBAVUTIL_VERSION_INT,
2022 };
2023 
2024 AVInputFormat ff_rtp_demuxer = {
2025  .name = "rtp",
2026  .long_name = NULL_IF_CONFIG_SMALL("RTP input format"),
2027  .priv_data_size = sizeof(RTSPState),
2028  .read_probe = rtp_probe,
2029  .read_header = rtp_read_header,
2031  .read_close = sdp_read_close,
2032  .flags = AVFMT_NOFILE,
2033  .priv_class = &rtp_demuxer_class
2034 };
2035 #endif /* CONFIG_RTP_DEMUXER */
2036