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rtsp.c
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1 /*
2  * RTSP/SDP client
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/avassert.h"
23 #include "libavutil/base64.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/mathematics.h"
27 #include "libavutil/parseutils.h"
28 #include "libavutil/random_seed.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/time.h"
32 #include "avformat.h"
33 #include "avio_internal.h"
34 
35 #if HAVE_POLL_H
36 #include <poll.h>
37 #endif
38 #include "internal.h"
39 #include "network.h"
40 #include "os_support.h"
41 #include "http.h"
42 #include "rtsp.h"
43 
44 #include "rtpdec.h"
45 #include "rtpproto.h"
46 #include "rdt.h"
47 #include "rtpdec_formats.h"
48 #include "rtpenc_chain.h"
49 #include "url.h"
50 #include "rtpenc.h"
51 #include "mpegts.h"
52 
53 /* Timeout values for socket poll, in ms,
54  * and read_packet(), in seconds */
55 #define POLL_TIMEOUT_MS 100
56 #define READ_PACKET_TIMEOUT_S 10
57 #define MAX_TIMEOUTS READ_PACKET_TIMEOUT_S * 1000 / POLL_TIMEOUT_MS
58 #define SDP_MAX_SIZE 16384
59 #define RECVBUF_SIZE 10 * RTP_MAX_PACKET_LENGTH
60 #define DEFAULT_REORDERING_DELAY 100000
61 
62 #define OFFSET(x) offsetof(RTSPState, x)
63 #define DEC AV_OPT_FLAG_DECODING_PARAM
64 #define ENC AV_OPT_FLAG_ENCODING_PARAM
65 
66 #define RTSP_FLAG_OPTS(name, longname) \
67  { name, longname, OFFSET(rtsp_flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, DEC, "rtsp_flags" }, \
68  { "filter_src", "only receive packets from the negotiated peer IP", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_FILTER_SRC}, 0, 0, DEC, "rtsp_flags" }
69 
70 #define RTSP_MEDIATYPE_OPTS(name, longname) \
71  { name, longname, OFFSET(media_type_mask), AV_OPT_TYPE_FLAGS, { .i64 = (1 << (AVMEDIA_TYPE_DATA+1)) - 1 }, INT_MIN, INT_MAX, DEC, "allowed_media_types" }, \
72  { "video", "Video", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_VIDEO}, 0, 0, DEC, "allowed_media_types" }, \
73  { "audio", "Audio", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_AUDIO}, 0, 0, DEC, "allowed_media_types" }, \
74  { "data", "Data", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_DATA}, 0, 0, DEC, "allowed_media_types" }
75 
76 #define RTSP_REORDERING_OPTS() \
77  { "reorder_queue_size", "set number of packets to buffer for handling of reordered packets", OFFSET(reordering_queue_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, DEC }
78 
80  { "initial_pause", "do not start playing the stream immediately", OFFSET(initial_pause), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
81  FF_RTP_FLAG_OPTS(RTSPState, rtp_muxer_flags),
82  { "rtsp_transport", "set RTSP transport protocols", OFFSET(lower_transport_mask), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, DEC|ENC, "rtsp_transport" }, \
83  { "udp", "UDP", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << RTSP_LOWER_TRANSPORT_UDP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
84  { "tcp", "TCP", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << RTSP_LOWER_TRANSPORT_TCP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
85  { "udp_multicast", "UDP multicast", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << RTSP_LOWER_TRANSPORT_UDP_MULTICAST}, 0, 0, DEC, "rtsp_transport" },
86  { "http", "HTTP tunneling", 0, AV_OPT_TYPE_CONST, {.i64 = (1 << RTSP_LOWER_TRANSPORT_HTTP)}, 0, 0, DEC, "rtsp_transport" },
87  RTSP_FLAG_OPTS("rtsp_flags", "set RTSP flags"),
88  { "listen", "wait for incoming connections", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_LISTEN}, 0, 0, DEC, "rtsp_flags" },
89  RTSP_MEDIATYPE_OPTS("allowed_media_types", "set media types to accept from the server"),
90  { "min_port", "set minimum local UDP port", OFFSET(rtp_port_min), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MIN}, 0, 65535, DEC|ENC },
91  { "max_port", "set maximum local UDP port", OFFSET(rtp_port_max), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MAX}, 0, 65535, DEC|ENC },
92  { "timeout", "set maximum timeout (in seconds) to wait for incoming connections (-1 is infinite, imply flag listen)", OFFSET(initial_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, DEC },
93  { "stimeout", "set timeout (in micro seconds) of socket TCP I/O operations", OFFSET(stimeout), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
95  { "user-agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT}, 0, 0, DEC },
96  { NULL },
97 };
98 
99 static const AVOption sdp_options[] = {
100  RTSP_FLAG_OPTS("sdp_flags", "SDP flags"),
101  { "custom_io", "use custom I/O", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_CUSTOM_IO}, 0, 0, DEC, "rtsp_flags" },
102  { "rtcp_to_source", "send RTCP packets to the source address of received packets", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_RTCP_TO_SOURCE}, 0, 0, DEC, "rtsp_flags" },
103  RTSP_MEDIATYPE_OPTS("allowed_media_types", "set media types to accept from the server"),
105  { NULL },
106 };
107 
108 static const AVOption rtp_options[] = {
109  RTSP_FLAG_OPTS("rtp_flags", "set RTP flags"),
111  { NULL },
112 };
113 
114 static void get_word_until_chars(char *buf, int buf_size,
115  const char *sep, const char **pp)
116 {
117  const char *p;
118  char *q;
119 
120  p = *pp;
121  p += strspn(p, SPACE_CHARS);
122  q = buf;
123  while (!strchr(sep, *p) && *p != '\0') {
124  if ((q - buf) < buf_size - 1)
125  *q++ = *p;
126  p++;
127  }
128  if (buf_size > 0)
129  *q = '\0';
130  *pp = p;
131 }
132 
133 static void get_word_sep(char *buf, int buf_size, const char *sep,
134  const char **pp)
135 {
136  if (**pp == '/') (*pp)++;
137  get_word_until_chars(buf, buf_size, sep, pp);
138 }
139 
140 static void get_word(char *buf, int buf_size, const char **pp)
141 {
142  get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
143 }
144 
145 /** Parse a string p in the form of Range:npt=xx-xx, and determine the start
146  * and end time.
147  * Used for seeking in the rtp stream.
148  */
149 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
150 {
151  char buf[256];
152 
153  p += strspn(p, SPACE_CHARS);
154  if (!av_stristart(p, "npt=", &p))
155  return;
156 
157  *start = AV_NOPTS_VALUE;
158  *end = AV_NOPTS_VALUE;
159 
160  get_word_sep(buf, sizeof(buf), "-", &p);
161  av_parse_time(start, buf, 1);
162  if (*p == '-') {
163  p++;
164  get_word_sep(buf, sizeof(buf), "-", &p);
165  av_parse_time(end, buf, 1);
166  }
167 }
168 
169 static int get_sockaddr(const char *buf, struct sockaddr_storage *sock)
170 {
171  struct addrinfo hints = { 0 }, *ai = NULL;
172  hints.ai_flags = AI_NUMERICHOST;
173  if (getaddrinfo(buf, NULL, &hints, &ai))
174  return -1;
175  memcpy(sock, ai->ai_addr, FFMIN(sizeof(*sock), ai->ai_addrlen));
176  freeaddrinfo(ai);
177  return 0;
178 }
179 
180 #if CONFIG_RTPDEC
181 static void init_rtp_handler(RTPDynamicProtocolHandler *handler,
182  RTSPStream *rtsp_st, AVCodecContext *codec)
183 {
184  if (!handler)
185  return;
186  if (codec)
187  codec->codec_id = handler->codec_id;
188  rtsp_st->dynamic_handler = handler;
189  if (handler->alloc) {
190  rtsp_st->dynamic_protocol_context = handler->alloc();
191  if (!rtsp_st->dynamic_protocol_context)
192  rtsp_st->dynamic_handler = NULL;
193  }
194 }
195 
196 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
197 static int sdp_parse_rtpmap(AVFormatContext *s,
198  AVStream *st, RTSPStream *rtsp_st,
199  int payload_type, const char *p)
200 {
201  AVCodecContext *codec = st->codec;
202  char buf[256];
203  int i;
204  AVCodec *c;
205  const char *c_name;
206 
207  /* See if we can handle this kind of payload.
208  * The space should normally not be there but some Real streams or
209  * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
210  * have a trailing space. */
211  get_word_sep(buf, sizeof(buf), "/ ", &p);
212  if (payload_type < RTP_PT_PRIVATE) {
213  /* We are in a standard case
214  * (from http://www.iana.org/assignments/rtp-parameters). */
215  codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
216  }
217 
218  if (codec->codec_id == AV_CODEC_ID_NONE) {
219  RTPDynamicProtocolHandler *handler =
221  init_rtp_handler(handler, rtsp_st, codec);
222  /* If no dynamic handler was found, check with the list of standard
223  * allocated types, if such a stream for some reason happens to
224  * use a private payload type. This isn't handled in rtpdec.c, since
225  * the format name from the rtpmap line never is passed into rtpdec. */
226  if (!rtsp_st->dynamic_handler)
227  codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
228  }
229 
230  c = avcodec_find_decoder(codec->codec_id);
231  if (c && c->name)
232  c_name = c->name;
233  else
234  c_name = "(null)";
235 
236  get_word_sep(buf, sizeof(buf), "/", &p);
237  i = atoi(buf);
238  switch (codec->codec_type) {
239  case AVMEDIA_TYPE_AUDIO:
240  av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
243  if (i > 0) {
244  codec->sample_rate = i;
245  avpriv_set_pts_info(st, 32, 1, codec->sample_rate);
246  get_word_sep(buf, sizeof(buf), "/", &p);
247  i = atoi(buf);
248  if (i > 0)
249  codec->channels = i;
250  }
251  av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
252  codec->sample_rate);
253  av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
254  codec->channels);
255  break;
256  case AVMEDIA_TYPE_VIDEO:
257  av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
258  if (i > 0)
259  avpriv_set_pts_info(st, 32, 1, i);
260  break;
261  default:
262  break;
263  }
264  if (rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->init)
265  rtsp_st->dynamic_handler->init(s, st->index,
266  rtsp_st->dynamic_protocol_context);
267  return 0;
268 }
269 
270 /* parse the attribute line from the fmtp a line of an sdp response. This
271  * is broken out as a function because it is used in rtp_h264.c, which is
272  * forthcoming. */
273 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
274  char *value, int value_size)
275 {
276  *p += strspn(*p, SPACE_CHARS);
277  if (**p) {
278  get_word_sep(attr, attr_size, "=", p);
279  if (**p == '=')
280  (*p)++;
281  get_word_sep(value, value_size, ";", p);
282  if (**p == ';')
283  (*p)++;
284  return 1;
285  }
286  return 0;
287 }
288 
289 typedef struct SDPParseState {
290  /* SDP only */
291  struct sockaddr_storage default_ip;
292  int default_ttl;
293  int skip_media; ///< set if an unknown m= line occurs
294  int nb_default_include_source_addrs; /**< Number of source-specific multicast include source IP address (from SDP content) */
295  struct RTSPSource **default_include_source_addrs; /**< Source-specific multicast include source IP address (from SDP content) */
296  int nb_default_exclude_source_addrs; /**< Number of source-specific multicast exclude source IP address (from SDP content) */
297  struct RTSPSource **default_exclude_source_addrs; /**< Source-specific multicast exclude source IP address (from SDP content) */
298 } SDPParseState;
299 
300 static void copy_default_source_addrs(struct RTSPSource **addrs, int count,
301  struct RTSPSource ***dest, int *dest_count)
302 {
303  RTSPSource *rtsp_src, *rtsp_src2;
304  int i;
305  for (i = 0; i < count; i++) {
306  rtsp_src = addrs[i];
307  rtsp_src2 = av_malloc(sizeof(*rtsp_src2));
308  if (!rtsp_src2)
309  continue;
310  memcpy(rtsp_src2, rtsp_src, sizeof(*rtsp_src));
311  dynarray_add(dest, dest_count, rtsp_src2);
312  }
313 }
314 
315 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
316  int letter, const char *buf)
317 {
318  RTSPState *rt = s->priv_data;
319  char buf1[64], st_type[64];
320  const char *p;
321  enum AVMediaType codec_type;
322  int payload_type, i;
323  AVStream *st;
324  RTSPStream *rtsp_st;
325  RTSPSource *rtsp_src;
326  struct sockaddr_storage sdp_ip;
327  int ttl;
328 
329  av_dlog(s, "sdp: %c='%s'\n", letter, buf);
330 
331  p = buf;
332  if (s1->skip_media && letter != 'm')
333  return;
334  switch (letter) {
335  case 'c':
336  get_word(buf1, sizeof(buf1), &p);
337  if (strcmp(buf1, "IN") != 0)
338  return;
339  get_word(buf1, sizeof(buf1), &p);
340  if (strcmp(buf1, "IP4") && strcmp(buf1, "IP6"))
341  return;
342  get_word_sep(buf1, sizeof(buf1), "/", &p);
343  if (get_sockaddr(buf1, &sdp_ip))
344  return;
345  ttl = 16;
346  if (*p == '/') {
347  p++;
348  get_word_sep(buf1, sizeof(buf1), "/", &p);
349  ttl = atoi(buf1);
350  }
351  if (s->nb_streams == 0) {
352  s1->default_ip = sdp_ip;
353  s1->default_ttl = ttl;
354  } else {
355  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
356  rtsp_st->sdp_ip = sdp_ip;
357  rtsp_st->sdp_ttl = ttl;
358  }
359  break;
360  case 's':
361  av_dict_set(&s->metadata, "title", p, 0);
362  break;
363  case 'i':
364  if (s->nb_streams == 0) {
365  av_dict_set(&s->metadata, "comment", p, 0);
366  break;
367  }
368  break;
369  case 'm':
370  /* new stream */
371  s1->skip_media = 0;
372  codec_type = AVMEDIA_TYPE_UNKNOWN;
373  get_word(st_type, sizeof(st_type), &p);
374  if (!strcmp(st_type, "audio")) {
375  codec_type = AVMEDIA_TYPE_AUDIO;
376  } else if (!strcmp(st_type, "video")) {
377  codec_type = AVMEDIA_TYPE_VIDEO;
378  } else if (!strcmp(st_type, "application")) {
379  codec_type = AVMEDIA_TYPE_DATA;
380  }
381  if (codec_type == AVMEDIA_TYPE_UNKNOWN || !(rt->media_type_mask & (1 << codec_type))) {
382  s1->skip_media = 1;
383  return;
384  }
385  rtsp_st = av_mallocz(sizeof(RTSPStream));
386  if (!rtsp_st)
387  return;
388  rtsp_st->stream_index = -1;
389  dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
390 
391  rtsp_st->sdp_ip = s1->default_ip;
392  rtsp_st->sdp_ttl = s1->default_ttl;
393 
394  copy_default_source_addrs(s1->default_include_source_addrs,
395  s1->nb_default_include_source_addrs,
396  &rtsp_st->include_source_addrs,
397  &rtsp_st->nb_include_source_addrs);
398  copy_default_source_addrs(s1->default_exclude_source_addrs,
399  s1->nb_default_exclude_source_addrs,
400  &rtsp_st->exclude_source_addrs,
401  &rtsp_st->nb_exclude_source_addrs);
402 
403  get_word(buf1, sizeof(buf1), &p); /* port */
404  rtsp_st->sdp_port = atoi(buf1);
405 
406  get_word(buf1, sizeof(buf1), &p); /* protocol */
407  if (!strcmp(buf1, "udp"))
409  else if (strstr(buf1, "/AVPF") || strstr(buf1, "/SAVPF"))
410  rtsp_st->feedback = 1;
411 
412  /* XXX: handle list of formats */
413  get_word(buf1, sizeof(buf1), &p); /* format list */
414  rtsp_st->sdp_payload_type = atoi(buf1);
415 
416  if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
417  /* no corresponding stream */
418  if (rt->transport == RTSP_TRANSPORT_RAW) {
419  if (!rt->ts && CONFIG_RTPDEC)
420  rt->ts = ff_mpegts_parse_open(s);
421  } else {
423  handler = ff_rtp_handler_find_by_id(
425  init_rtp_handler(handler, rtsp_st, NULL);
426  if (handler && handler->init)
427  handler->init(s, -1, rtsp_st->dynamic_protocol_context);
428  }
429  } else if (rt->server_type == RTSP_SERVER_WMS &&
430  codec_type == AVMEDIA_TYPE_DATA) {
431  /* RTX stream, a stream that carries all the other actual
432  * audio/video streams. Don't expose this to the callers. */
433  } else {
434  st = avformat_new_stream(s, NULL);
435  if (!st)
436  return;
437  st->id = rt->nb_rtsp_streams - 1;
438  rtsp_st->stream_index = st->index;
439  st->codec->codec_type = codec_type;
440  if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
442  /* if standard payload type, we can find the codec right now */
444  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
445  st->codec->sample_rate > 0)
446  avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
447  /* Even static payload types may need a custom depacketizer */
448  handler = ff_rtp_handler_find_by_id(
449  rtsp_st->sdp_payload_type, st->codec->codec_type);
450  init_rtp_handler(handler, rtsp_st, st->codec);
451  if (handler && handler->init)
452  handler->init(s, st->index,
453  rtsp_st->dynamic_protocol_context);
454  }
455  }
456  /* put a default control url */
457  av_strlcpy(rtsp_st->control_url, rt->control_uri,
458  sizeof(rtsp_st->control_url));
459  break;
460  case 'a':
461  if (av_strstart(p, "control:", &p)) {
462  if (s->nb_streams == 0) {
463  if (!strncmp(p, "rtsp://", 7))
464  av_strlcpy(rt->control_uri, p,
465  sizeof(rt->control_uri));
466  } else {
467  char proto[32];
468  /* get the control url */
469  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
470 
471  /* XXX: may need to add full url resolution */
472  av_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
473  NULL, NULL, 0, p);
474  if (proto[0] == '\0') {
475  /* relative control URL */
476  if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
477  av_strlcat(rtsp_st->control_url, "/",
478  sizeof(rtsp_st->control_url));
479  av_strlcat(rtsp_st->control_url, p,
480  sizeof(rtsp_st->control_url));
481  } else
482  av_strlcpy(rtsp_st->control_url, p,
483  sizeof(rtsp_st->control_url));
484  }
485  } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
486  /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
487  get_word(buf1, sizeof(buf1), &p);
488  payload_type = atoi(buf1);
489  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
490  if (rtsp_st->stream_index >= 0) {
491  st = s->streams[rtsp_st->stream_index];
492  sdp_parse_rtpmap(s, st, rtsp_st, payload_type, p);
493  }
494  } else if (av_strstart(p, "fmtp:", &p) ||
495  av_strstart(p, "framesize:", &p)) {
496  /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
497  // let dynamic protocol handlers have a stab at the line.
498  get_word(buf1, sizeof(buf1), &p);
499  payload_type = atoi(buf1);
500  for (i = 0; i < rt->nb_rtsp_streams; i++) {
501  rtsp_st = rt->rtsp_streams[i];
502  if (rtsp_st->sdp_payload_type == payload_type &&
503  rtsp_st->dynamic_handler &&
505  rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
506  rtsp_st->dynamic_protocol_context, buf);
507  }
508  } else if (av_strstart(p, "range:", &p)) {
509  int64_t start, end;
510 
511  // this is so that seeking on a streamed file can work.
512  rtsp_parse_range_npt(p, &start, &end);
513  s->start_time = start;
514  /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
515  s->duration = (end == AV_NOPTS_VALUE) ?
516  AV_NOPTS_VALUE : end - start;
517  } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
518  if (atoi(p) == 1)
520  } else if (av_strstart(p, "SampleRate:integer;", &p) &&
521  s->nb_streams > 0) {
522  st = s->streams[s->nb_streams - 1];
523  st->codec->sample_rate = atoi(p);
524  } else if (av_strstart(p, "crypto:", &p) && s->nb_streams > 0) {
525  // RFC 4568
526  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
527  get_word(buf1, sizeof(buf1), &p); // ignore tag
528  get_word(rtsp_st->crypto_suite, sizeof(rtsp_st->crypto_suite), &p);
529  p += strspn(p, SPACE_CHARS);
530  if (av_strstart(p, "inline:", &p))
531  get_word(rtsp_st->crypto_params, sizeof(rtsp_st->crypto_params), &p);
532  } else if (av_strstart(p, "source-filter:", &p)) {
533  int exclude = 0;
534  get_word(buf1, sizeof(buf1), &p);
535  if (strcmp(buf1, "incl") && strcmp(buf1, "excl"))
536  return;
537  exclude = !strcmp(buf1, "excl");
538 
539  get_word(buf1, sizeof(buf1), &p);
540  if (strcmp(buf1, "IN") != 0)
541  return;
542  get_word(buf1, sizeof(buf1), &p);
543  if (strcmp(buf1, "IP4") && strcmp(buf1, "IP6") && strcmp(buf1, "*"))
544  return;
545  // not checking that the destination address actually matches or is wildcard
546  get_word(buf1, sizeof(buf1), &p);
547 
548  while (*p != '\0') {
549  rtsp_src = av_mallocz(sizeof(*rtsp_src));
550  if (!rtsp_src)
551  return;
552  get_word(rtsp_src->addr, sizeof(rtsp_src->addr), &p);
553  if (exclude) {
554  if (s->nb_streams == 0) {
555  dynarray_add(&s1->default_exclude_source_addrs, &s1->nb_default_exclude_source_addrs, rtsp_src);
556  } else {
557  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
558  dynarray_add(&rtsp_st->exclude_source_addrs, &rtsp_st->nb_exclude_source_addrs, rtsp_src);
559  }
560  } else {
561  if (s->nb_streams == 0) {
562  dynarray_add(&s1->default_include_source_addrs, &s1->nb_default_include_source_addrs, rtsp_src);
563  } else {
564  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
565  dynarray_add(&rtsp_st->include_source_addrs, &rtsp_st->nb_include_source_addrs, rtsp_src);
566  }
567  }
568  }
569  } else {
570  if (rt->server_type == RTSP_SERVER_WMS)
572  if (s->nb_streams > 0) {
573  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
574 
575  if (rt->server_type == RTSP_SERVER_REAL)
576  ff_real_parse_sdp_a_line(s, rtsp_st->stream_index, p);
577 
578  if (rtsp_st->dynamic_handler &&
580  rtsp_st->dynamic_handler->parse_sdp_a_line(s,
581  rtsp_st->stream_index,
582  rtsp_st->dynamic_protocol_context, buf);
583  }
584  }
585  break;
586  }
587 }
588 
589 int ff_sdp_parse(AVFormatContext *s, const char *content)
590 {
591  RTSPState *rt = s->priv_data;
592  const char *p;
593  int letter, i;
594  /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
595  * contain long SDP lines containing complete ASF Headers (several
596  * kB) or arrays of MDPR (RM stream descriptor) headers plus
597  * "rulebooks" describing their properties. Therefore, the SDP line
598  * buffer is large.
599  *
600  * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
601  * in rtpdec_xiph.c. */
602  char buf[16384], *q;
603  SDPParseState sdp_parse_state = { { 0 } }, *s1 = &sdp_parse_state;
604 
605  p = content;
606  for (;;) {
607  p += strspn(p, SPACE_CHARS);
608  letter = *p;
609  if (letter == '\0')
610  break;
611  p++;
612  if (*p != '=')
613  goto next_line;
614  p++;
615  /* get the content */
616  q = buf;
617  while (*p != '\n' && *p != '\r' && *p != '\0') {
618  if ((q - buf) < sizeof(buf) - 1)
619  *q++ = *p;
620  p++;
621  }
622  *q = '\0';
623  sdp_parse_line(s, s1, letter, buf);
624  next_line:
625  while (*p != '\n' && *p != '\0')
626  p++;
627  if (*p == '\n')
628  p++;
629  }
630 
631  for (i = 0; i < s1->nb_default_include_source_addrs; i++)
632  av_free(s1->default_include_source_addrs[i]);
633  av_freep(&s1->default_include_source_addrs);
634  for (i = 0; i < s1->nb_default_exclude_source_addrs; i++)
635  av_free(s1->default_exclude_source_addrs[i]);
636  av_freep(&s1->default_exclude_source_addrs);
637 
638  rt->p = av_malloc(sizeof(struct pollfd)*2*(rt->nb_rtsp_streams+1));
639  if (!rt->p) return AVERROR(ENOMEM);
640  return 0;
641 }
642 #endif /* CONFIG_RTPDEC */
643 
644 void ff_rtsp_undo_setup(AVFormatContext *s, int send_packets)
645 {
646  RTSPState *rt = s->priv_data;
647  int i;
648 
649  for (i = 0; i < rt->nb_rtsp_streams; i++) {
650  RTSPStream *rtsp_st = rt->rtsp_streams[i];
651  if (!rtsp_st)
652  continue;
653  if (rtsp_st->transport_priv) {
654  if (s->oformat) {
655  AVFormatContext *rtpctx = rtsp_st->transport_priv;
656  av_write_trailer(rtpctx);
658  uint8_t *ptr;
659  if (CONFIG_RTSP_MUXER && rtpctx->pb && send_packets)
660  ff_rtsp_tcp_write_packet(s, rtsp_st);
661  avio_close_dyn_buf(rtpctx->pb, &ptr);
662  av_free(ptr);
663  } else {
664  avio_close(rtpctx->pb);
665  }
666  avformat_free_context(rtpctx);
667  } else if (rt->transport == RTSP_TRANSPORT_RDT && CONFIG_RTPDEC)
669  else if (rt->transport == RTSP_TRANSPORT_RTP && CONFIG_RTPDEC)
671  }
672  rtsp_st->transport_priv = NULL;
673  if (rtsp_st->rtp_handle)
674  ffurl_close(rtsp_st->rtp_handle);
675  rtsp_st->rtp_handle = NULL;
676  }
677 }
678 
679 /* close and free RTSP streams */
681 {
682  RTSPState *rt = s->priv_data;
683  int i, j;
684  RTSPStream *rtsp_st;
685 
686  ff_rtsp_undo_setup(s, 0);
687  for (i = 0; i < rt->nb_rtsp_streams; i++) {
688  rtsp_st = rt->rtsp_streams[i];
689  if (rtsp_st) {
690  if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
691  rtsp_st->dynamic_handler->free(
692  rtsp_st->dynamic_protocol_context);
693  for (j = 0; j < rtsp_st->nb_include_source_addrs; j++)
694  av_free(rtsp_st->include_source_addrs[j]);
695  av_freep(&rtsp_st->include_source_addrs);
696  for (j = 0; j < rtsp_st->nb_exclude_source_addrs; j++)
697  av_free(rtsp_st->exclude_source_addrs[j]);
698  av_freep(&rtsp_st->exclude_source_addrs);
699 
700  av_free(rtsp_st);
701  }
702  }
703  av_free(rt->rtsp_streams);
704  if (rt->asf_ctx) {
706  }
707  if (rt->ts && CONFIG_RTPDEC)
709  av_free(rt->p);
710  av_free(rt->recvbuf);
711 }
712 
714 {
715  RTSPState *rt = s->priv_data;
716  AVStream *st = NULL;
717  int reordering_queue_size = rt->reordering_queue_size;
718  if (reordering_queue_size < 0) {
720  reordering_queue_size = 0;
721  else
722  reordering_queue_size = RTP_REORDER_QUEUE_DEFAULT_SIZE;
723  }
724 
725  /* open the RTP context */
726  if (rtsp_st->stream_index >= 0)
727  st = s->streams[rtsp_st->stream_index];
728  if (!st)
730 
731  if (s->oformat && CONFIG_RTSP_MUXER) {
733  s, st, rtsp_st->rtp_handle,
735  rtsp_st->stream_index);
736  /* Ownership of rtp_handle is passed to the rtp mux context */
737  rtsp_st->rtp_handle = NULL;
738  if (ret < 0)
739  return ret;
740  } else if (rt->transport == RTSP_TRANSPORT_RAW) {
741  return 0; // Don't need to open any parser here
742  } else if (rt->transport == RTSP_TRANSPORT_RDT && CONFIG_RTPDEC)
743  rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
744  rtsp_st->dynamic_protocol_context,
745  rtsp_st->dynamic_handler);
746  else if (CONFIG_RTPDEC)
747  rtsp_st->transport_priv = ff_rtp_parse_open(s, st,
748  rtsp_st->sdp_payload_type,
749  reordering_queue_size);
750 
751  if (!rtsp_st->transport_priv) {
752  return AVERROR(ENOMEM);
753  } else if (rt->transport == RTSP_TRANSPORT_RTP && CONFIG_RTPDEC) {
754  if (rtsp_st->dynamic_handler) {
756  rtsp_st->dynamic_protocol_context,
757  rtsp_st->dynamic_handler);
758  }
759  if (rtsp_st->crypto_suite[0])
761  rtsp_st->crypto_suite,
762  rtsp_st->crypto_params);
763  }
764 
765  return 0;
766 }
767 
768 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
769 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
770 {
771  const char *q;
772  char *p;
773  int v;
774 
775  q = *pp;
776  q += strspn(q, SPACE_CHARS);
777  v = strtol(q, &p, 10);
778  if (*p == '-') {
779  p++;
780  *min_ptr = v;
781  v = strtol(p, &p, 10);
782  *max_ptr = v;
783  } else {
784  *min_ptr = v;
785  *max_ptr = v;
786  }
787  *pp = p;
788 }
789 
790 /* XXX: only one transport specification is parsed */
791 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
792 {
793  char transport_protocol[16];
794  char profile[16];
795  char lower_transport[16];
796  char parameter[16];
798  char buf[256];
799 
800  reply->nb_transports = 0;
801 
802  for (;;) {
803  p += strspn(p, SPACE_CHARS);
804  if (*p == '\0')
805  break;
806 
807  th = &reply->transports[reply->nb_transports];
808 
809  get_word_sep(transport_protocol, sizeof(transport_protocol),
810  "/", &p);
811  if (!av_strcasecmp (transport_protocol, "rtp")) {
812  get_word_sep(profile, sizeof(profile), "/;,", &p);
813  lower_transport[0] = '\0';
814  /* rtp/avp/<protocol> */
815  if (*p == '/') {
816  get_word_sep(lower_transport, sizeof(lower_transport),
817  ";,", &p);
818  }
820  } else if (!av_strcasecmp (transport_protocol, "x-pn-tng") ||
821  !av_strcasecmp (transport_protocol, "x-real-rdt")) {
822  /* x-pn-tng/<protocol> */
823  get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
824  profile[0] = '\0';
826  } else if (!av_strcasecmp(transport_protocol, "raw")) {
827  get_word_sep(profile, sizeof(profile), "/;,", &p);
828  lower_transport[0] = '\0';
829  /* raw/raw/<protocol> */
830  if (*p == '/') {
831  get_word_sep(lower_transport, sizeof(lower_transport),
832  ";,", &p);
833  }
835  }
836  if (!av_strcasecmp(lower_transport, "TCP"))
838  else
840 
841  if (*p == ';')
842  p++;
843  /* get each parameter */
844  while (*p != '\0' && *p != ',') {
845  get_word_sep(parameter, sizeof(parameter), "=;,", &p);
846  if (!strcmp(parameter, "port")) {
847  if (*p == '=') {
848  p++;
849  rtsp_parse_range(&th->port_min, &th->port_max, &p);
850  }
851  } else if (!strcmp(parameter, "client_port")) {
852  if (*p == '=') {
853  p++;
854  rtsp_parse_range(&th->client_port_min,
855  &th->client_port_max, &p);
856  }
857  } else if (!strcmp(parameter, "server_port")) {
858  if (*p == '=') {
859  p++;
860  rtsp_parse_range(&th->server_port_min,
861  &th->server_port_max, &p);
862  }
863  } else if (!strcmp(parameter, "interleaved")) {
864  if (*p == '=') {
865  p++;
866  rtsp_parse_range(&th->interleaved_min,
867  &th->interleaved_max, &p);
868  }
869  } else if (!strcmp(parameter, "multicast")) {
872  } else if (!strcmp(parameter, "ttl")) {
873  if (*p == '=') {
874  char *end;
875  p++;
876  th->ttl = strtol(p, &end, 10);
877  p = end;
878  }
879  } else if (!strcmp(parameter, "destination")) {
880  if (*p == '=') {
881  p++;
882  get_word_sep(buf, sizeof(buf), ";,", &p);
883  get_sockaddr(buf, &th->destination);
884  }
885  } else if (!strcmp(parameter, "source")) {
886  if (*p == '=') {
887  p++;
888  get_word_sep(buf, sizeof(buf), ";,", &p);
889  av_strlcpy(th->source, buf, sizeof(th->source));
890  }
891  } else if (!strcmp(parameter, "mode")) {
892  if (*p == '=') {
893  p++;
894  get_word_sep(buf, sizeof(buf), ";, ", &p);
895  if (!strcmp(buf, "record") ||
896  !strcmp(buf, "receive"))
897  th->mode_record = 1;
898  }
899  }
900 
901  while (*p != ';' && *p != '\0' && *p != ',')
902  p++;
903  if (*p == ';')
904  p++;
905  }
906  if (*p == ',')
907  p++;
908 
909  reply->nb_transports++;
910  }
911 }
912 
913 static void handle_rtp_info(RTSPState *rt, const char *url,
914  uint32_t seq, uint32_t rtptime)
915 {
916  int i;
917  if (!rtptime || !url[0])
918  return;
919  if (rt->transport != RTSP_TRANSPORT_RTP)
920  return;
921  for (i = 0; i < rt->nb_rtsp_streams; i++) {
922  RTSPStream *rtsp_st = rt->rtsp_streams[i];
923  RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
924  if (!rtpctx)
925  continue;
926  if (!strcmp(rtsp_st->control_url, url)) {
927  rtpctx->base_timestamp = rtptime;
928  break;
929  }
930  }
931 }
932 
933 static void rtsp_parse_rtp_info(RTSPState *rt, const char *p)
934 {
935  int read = 0;
936  char key[20], value[1024], url[1024] = "";
937  uint32_t seq = 0, rtptime = 0;
938 
939  for (;;) {
940  p += strspn(p, SPACE_CHARS);
941  if (!*p)
942  break;
943  get_word_sep(key, sizeof(key), "=", &p);
944  if (*p != '=')
945  break;
946  p++;
947  get_word_sep(value, sizeof(value), ";, ", &p);
948  read++;
949  if (!strcmp(key, "url"))
950  av_strlcpy(url, value, sizeof(url));
951  else if (!strcmp(key, "seq"))
952  seq = strtoul(value, NULL, 10);
953  else if (!strcmp(key, "rtptime"))
954  rtptime = strtoul(value, NULL, 10);
955  if (*p == ',') {
956  handle_rtp_info(rt, url, seq, rtptime);
957  url[0] = '\0';
958  seq = rtptime = 0;
959  read = 0;
960  }
961  if (*p)
962  p++;
963  }
964  if (read > 0)
965  handle_rtp_info(rt, url, seq, rtptime);
966 }
967 
968 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
969  RTSPState *rt, const char *method)
970 {
971  const char *p;
972 
973  /* NOTE: we do case independent match for broken servers */
974  p = buf;
975  if (av_stristart(p, "Session:", &p)) {
976  int t;
977  get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
978  if (av_stristart(p, ";timeout=", &p) &&
979  (t = strtol(p, NULL, 10)) > 0) {
980  reply->timeout = t;
981  }
982  } else if (av_stristart(p, "Content-Length:", &p)) {
983  reply->content_length = strtol(p, NULL, 10);
984  } else if (av_stristart(p, "Transport:", &p)) {
985  rtsp_parse_transport(reply, p);
986  } else if (av_stristart(p, "CSeq:", &p)) {
987  reply->seq = strtol(p, NULL, 10);
988  } else if (av_stristart(p, "Range:", &p)) {
989  rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
990  } else if (av_stristart(p, "RealChallenge1:", &p)) {
991  p += strspn(p, SPACE_CHARS);
992  av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
993  } else if (av_stristart(p, "Server:", &p)) {
994  p += strspn(p, SPACE_CHARS);
995  av_strlcpy(reply->server, p, sizeof(reply->server));
996  } else if (av_stristart(p, "Notice:", &p) ||
997  av_stristart(p, "X-Notice:", &p)) {
998  reply->notice = strtol(p, NULL, 10);
999  } else if (av_stristart(p, "Location:", &p)) {
1000  p += strspn(p, SPACE_CHARS);
1001  av_strlcpy(reply->location, p , sizeof(reply->location));
1002  } else if (av_stristart(p, "WWW-Authenticate:", &p) && rt) {
1003  p += strspn(p, SPACE_CHARS);
1004  ff_http_auth_handle_header(&rt->auth_state, "WWW-Authenticate", p);
1005  } else if (av_stristart(p, "Authentication-Info:", &p) && rt) {
1006  p += strspn(p, SPACE_CHARS);
1007  ff_http_auth_handle_header(&rt->auth_state, "Authentication-Info", p);
1008  } else if (av_stristart(p, "Content-Base:", &p) && rt) {
1009  p += strspn(p, SPACE_CHARS);
1010  if (method && !strcmp(method, "DESCRIBE"))
1011  av_strlcpy(rt->control_uri, p , sizeof(rt->control_uri));
1012  } else if (av_stristart(p, "RTP-Info:", &p) && rt) {
1013  p += strspn(p, SPACE_CHARS);
1014  if (method && !strcmp(method, "PLAY"))
1015  rtsp_parse_rtp_info(rt, p);
1016  } else if (av_stristart(p, "Public:", &p) && rt) {
1017  if (strstr(p, "GET_PARAMETER") &&
1018  method && !strcmp(method, "OPTIONS"))
1019  rt->get_parameter_supported = 1;
1020  } else if (av_stristart(p, "x-Accept-Dynamic-Rate:", &p) && rt) {
1021  p += strspn(p, SPACE_CHARS);
1022  rt->accept_dynamic_rate = atoi(p);
1023  } else if (av_stristart(p, "Content-Type:", &p)) {
1024  p += strspn(p, SPACE_CHARS);
1025  av_strlcpy(reply->content_type, p, sizeof(reply->content_type));
1026  }
1027 }
1028 
1029 /* skip a RTP/TCP interleaved packet */
1031 {
1032  RTSPState *rt = s->priv_data;
1033  int ret, len, len1;
1034  uint8_t buf[1024];
1035 
1036  ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
1037  if (ret != 3)
1038  return;
1039  len = AV_RB16(buf + 1);
1040 
1041  av_dlog(s, "skipping RTP packet len=%d\n", len);
1042 
1043  /* skip payload */
1044  while (len > 0) {
1045  len1 = len;
1046  if (len1 > sizeof(buf))
1047  len1 = sizeof(buf);
1048  ret = ffurl_read_complete(rt->rtsp_hd, buf, len1);
1049  if (ret != len1)
1050  return;
1051  len -= len1;
1052  }
1053 }
1054 
1056  unsigned char **content_ptr,
1057  int return_on_interleaved_data, const char *method)
1058 {
1059  RTSPState *rt = s->priv_data;
1060  char buf[4096], buf1[1024], *q;
1061  unsigned char ch;
1062  const char *p;
1063  int ret, content_length, line_count = 0, request = 0;
1064  unsigned char *content = NULL;
1065 
1066 start:
1067  line_count = 0;
1068  request = 0;
1069  content = NULL;
1070  memset(reply, 0, sizeof(*reply));
1071 
1072  /* parse reply (XXX: use buffers) */
1073  rt->last_reply[0] = '\0';
1074  for (;;) {
1075  q = buf;
1076  for (;;) {
1077  ret = ffurl_read_complete(rt->rtsp_hd, &ch, 1);
1078  av_dlog(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
1079  if (ret != 1)
1080  return AVERROR_EOF;
1081  if (ch == '\n')
1082  break;
1083  if (ch == '$') {
1084  /* XXX: only parse it if first char on line ? */
1085  if (return_on_interleaved_data) {
1086  return 1;
1087  } else
1089  } else if (ch != '\r') {
1090  if ((q - buf) < sizeof(buf) - 1)
1091  *q++ = ch;
1092  }
1093  }
1094  *q = '\0';
1095 
1096  av_dlog(s, "line='%s'\n", buf);
1097 
1098  /* test if last line */
1099  if (buf[0] == '\0')
1100  break;
1101  p = buf;
1102  if (line_count == 0) {
1103  /* get reply code */
1104  get_word(buf1, sizeof(buf1), &p);
1105  if (!strncmp(buf1, "RTSP/", 5)) {
1106  get_word(buf1, sizeof(buf1), &p);
1107  reply->status_code = atoi(buf1);
1108  av_strlcpy(reply->reason, p, sizeof(reply->reason));
1109  } else {
1110  av_strlcpy(reply->reason, buf1, sizeof(reply->reason)); // method
1111  get_word(buf1, sizeof(buf1), &p); // object
1112  request = 1;
1113  }
1114  } else {
1115  ff_rtsp_parse_line(reply, p, rt, method);
1116  av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
1117  av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
1118  }
1119  line_count++;
1120  }
1121 
1122  if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0' && !request)
1123  av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
1124 
1125  content_length = reply->content_length;
1126  if (content_length > 0) {
1127  /* leave some room for a trailing '\0' (useful for simple parsing) */
1128  content = av_malloc(content_length + 1);
1129  ffurl_read_complete(rt->rtsp_hd, content, content_length);
1130  content[content_length] = '\0';
1131  }
1132  if (content_ptr)
1133  *content_ptr = content;
1134  else
1135  av_free(content);
1136 
1137  if (request) {
1138  char buf[1024];
1139  char base64buf[AV_BASE64_SIZE(sizeof(buf))];
1140  const char* ptr = buf;
1141 
1142  if (!strcmp(reply->reason, "OPTIONS")) {
1143  snprintf(buf, sizeof(buf), "RTSP/1.0 200 OK\r\n");
1144  if (reply->seq)
1145  av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", reply->seq);
1146  if (reply->session_id[0])
1147  av_strlcatf(buf, sizeof(buf), "Session: %s\r\n",
1148  reply->session_id);
1149  } else {
1150  snprintf(buf, sizeof(buf), "RTSP/1.0 501 Not Implemented\r\n");
1151  }
1152  av_strlcat(buf, "\r\n", sizeof(buf));
1153 
1154  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1155  av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
1156  ptr = base64buf;
1157  }
1158  ffurl_write(rt->rtsp_hd_out, ptr, strlen(ptr));
1159 
1160  rt->last_cmd_time = av_gettime();
1161  /* Even if the request from the server had data, it is not the data
1162  * that the caller wants or expects. The memory could also be leaked
1163  * if the actual following reply has content data. */
1164  if (content_ptr)
1165  av_freep(content_ptr);
1166  /* If method is set, this is called from ff_rtsp_send_cmd,
1167  * where a reply to exactly this request is awaited. For
1168  * callers from within packet receiving, we just want to
1169  * return to the caller and go back to receiving packets. */
1170  if (method)
1171  goto start;
1172  return 0;
1173  }
1174 
1175  if (rt->seq != reply->seq) {
1176  av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
1177  rt->seq, reply->seq);
1178  }
1179 
1180  /* EOS */
1181  if (reply->notice == 2101 /* End-of-Stream Reached */ ||
1182  reply->notice == 2104 /* Start-of-Stream Reached */ ||
1183  reply->notice == 2306 /* Continuous Feed Terminated */) {
1184  rt->state = RTSP_STATE_IDLE;
1185  } else if (reply->notice >= 4400 && reply->notice < 5500) {
1186  return AVERROR(EIO); /* data or server error */
1187  } else if (reply->notice == 2401 /* Ticket Expired */ ||
1188  (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
1189  return AVERROR(EPERM);
1190 
1191  return 0;
1192 }
1193 
1194 /**
1195  * Send a command to the RTSP server without waiting for the reply.
1196  *
1197  * @param s RTSP (de)muxer context
1198  * @param method the method for the request
1199  * @param url the target url for the request
1200  * @param headers extra header lines to include in the request
1201  * @param send_content if non-null, the data to send as request body content
1202  * @param send_content_length the length of the send_content data, or 0 if
1203  * send_content is null
1204  *
1205  * @return zero if success, nonzero otherwise
1206  */
1207 static int rtsp_send_cmd_with_content_async(AVFormatContext *s,
1208  const char *method, const char *url,
1209  const char *headers,
1210  const unsigned char *send_content,
1211  int send_content_length)
1212 {
1213  RTSPState *rt = s->priv_data;
1214  char buf[4096], *out_buf;
1215  char base64buf[AV_BASE64_SIZE(sizeof(buf))];
1216 
1217  /* Add in RTSP headers */
1218  out_buf = buf;
1219  rt->seq++;
1220  snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
1221  if (headers)
1222  av_strlcat(buf, headers, sizeof(buf));
1223  av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
1224  av_strlcatf(buf, sizeof(buf), "User-Agent: %s\r\n", rt->user_agent);
1225  if (rt->session_id[0] != '\0' && (!headers ||
1226  !strstr(headers, "\nIf-Match:"))) {
1227  av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
1228  }
1229  if (rt->auth[0]) {
1230  char *str = ff_http_auth_create_response(&rt->auth_state,
1231  rt->auth, url, method);
1232  if (str)
1233  av_strlcat(buf, str, sizeof(buf));
1234  av_free(str);
1235  }
1236  if (send_content_length > 0 && send_content)
1237  av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
1238  av_strlcat(buf, "\r\n", sizeof(buf));
1239 
1240  /* base64 encode rtsp if tunneling */
1241  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1242  av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
1243  out_buf = base64buf;
1244  }
1245 
1246  av_dlog(s, "Sending:\n%s--\n", buf);
1247 
1248  ffurl_write(rt->rtsp_hd_out, out_buf, strlen(out_buf));
1249  if (send_content_length > 0 && send_content) {
1250  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1251  av_log(s, AV_LOG_ERROR, "tunneling of RTSP requests "
1252  "with content data not supported\n");
1253  return AVERROR_PATCHWELCOME;
1254  }
1255  ffurl_write(rt->rtsp_hd_out, send_content, send_content_length);
1256  }
1257  rt->last_cmd_time = av_gettime();
1258 
1259  return 0;
1260 }
1261 
1262 int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
1263  const char *url, const char *headers)
1264 {
1265  return rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
1266 }
1267 
1268 int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
1269  const char *headers, RTSPMessageHeader *reply,
1270  unsigned char **content_ptr)
1271 {
1272  return ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
1273  content_ptr, NULL, 0);
1274 }
1275 
1277  const char *method, const char *url,
1278  const char *header,
1279  RTSPMessageHeader *reply,
1280  unsigned char **content_ptr,
1281  const unsigned char *send_content,
1282  int send_content_length)
1283 {
1284  RTSPState *rt = s->priv_data;
1285  HTTPAuthType cur_auth_type;
1286  int ret, attempts = 0;
1287 
1288 retry:
1289  cur_auth_type = rt->auth_state.auth_type;
1290  if ((ret = rtsp_send_cmd_with_content_async(s, method, url, header,
1291  send_content,
1292  send_content_length)))
1293  return ret;
1294 
1295  if ((ret = ff_rtsp_read_reply(s, reply, content_ptr, 0, method) ) < 0)
1296  return ret;
1297  attempts++;
1298 
1299  if (reply->status_code == 401 &&
1300  (cur_auth_type == HTTP_AUTH_NONE || rt->auth_state.stale) &&
1301  rt->auth_state.auth_type != HTTP_AUTH_NONE && attempts < 2)
1302  goto retry;
1303 
1304  if (reply->status_code > 400){
1305  av_log(s, AV_LOG_ERROR, "method %s failed: %d%s\n",
1306  method,
1307  reply->status_code,
1308  reply->reason);
1309  av_log(s, AV_LOG_DEBUG, "%s\n", rt->last_reply);
1310  }
1311 
1312  return 0;
1313 }
1314 
1315 int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
1316  int lower_transport, const char *real_challenge)
1317 {
1318  RTSPState *rt = s->priv_data;
1319  int rtx = 0, j, i, err, interleave = 0, port_off;
1320  RTSPStream *rtsp_st;
1321  RTSPMessageHeader reply1, *reply = &reply1;
1322  char cmd[2048];
1323  const char *trans_pref;
1324 
1325  if (rt->transport == RTSP_TRANSPORT_RDT)
1326  trans_pref = "x-pn-tng";
1327  else if (rt->transport == RTSP_TRANSPORT_RAW)
1328  trans_pref = "RAW/RAW";
1329  else
1330  trans_pref = "RTP/AVP";
1331 
1332  /* default timeout: 1 minute */
1333  rt->timeout = 60;
1334 
1335  /* Choose a random starting offset within the first half of the
1336  * port range, to allow for a number of ports to try even if the offset
1337  * happens to be at the end of the random range. */
1338  port_off = av_get_random_seed() % ((rt->rtp_port_max - rt->rtp_port_min)/2);
1339  /* even random offset */
1340  port_off -= port_off & 0x01;
1341 
1342  for (j = rt->rtp_port_min + port_off, i = 0; i < rt->nb_rtsp_streams; ++i) {
1343  char transport[2048];
1344 
1345  /*
1346  * WMS serves all UDP data over a single connection, the RTX, which
1347  * isn't necessarily the first in the SDP but has to be the first
1348  * to be set up, else the second/third SETUP will fail with a 461.
1349  */
1350  if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1351  rt->server_type == RTSP_SERVER_WMS) {
1352  if (i == 0) {
1353  /* rtx first */
1354  for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1355  int len = strlen(rt->rtsp_streams[rtx]->control_url);
1356  if (len >= 4 &&
1357  !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1358  "/rtx"))
1359  break;
1360  }
1361  if (rtx == rt->nb_rtsp_streams)
1362  return -1; /* no RTX found */
1363  rtsp_st = rt->rtsp_streams[rtx];
1364  } else
1365  rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1366  } else
1367  rtsp_st = rt->rtsp_streams[i];
1368 
1369  /* RTP/UDP */
1370  if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1371  char buf[256];
1372 
1373  if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1374  port = reply->transports[0].client_port_min;
1375  goto have_port;
1376  }
1377 
1378  /* first try in specified port range */
1379  while (j <= rt->rtp_port_max) {
1380  ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1381  "?localport=%d", j);
1382  /* we will use two ports per rtp stream (rtp and rtcp) */
1383  j += 2;
1384  if (!ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
1385  &s->interrupt_callback, NULL))
1386  goto rtp_opened;
1387  }
1388  av_log(s, AV_LOG_ERROR, "Unable to open an input RTP port\n");
1389  err = AVERROR(EIO);
1390  goto fail;
1391 
1392  rtp_opened:
1393  port = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
1394  have_port:
1395  snprintf(transport, sizeof(transport) - 1,
1396  "%s/UDP;", trans_pref);
1397  if (rt->server_type != RTSP_SERVER_REAL)
1398  av_strlcat(transport, "unicast;", sizeof(transport));
1399  av_strlcatf(transport, sizeof(transport),
1400  "client_port=%d", port);
1401  if (rt->transport == RTSP_TRANSPORT_RTP &&
1402  !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1403  av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1404  }
1405 
1406  /* RTP/TCP */
1407  else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1408  /* For WMS streams, the application streams are only used for
1409  * UDP. When trying to set it up for TCP streams, the server
1410  * will return an error. Therefore, we skip those streams. */
1411  if (rt->server_type == RTSP_SERVER_WMS &&
1412  (rtsp_st->stream_index < 0 ||
1413  s->streams[rtsp_st->stream_index]->codec->codec_type ==
1415  continue;
1416  snprintf(transport, sizeof(transport) - 1,
1417  "%s/TCP;", trans_pref);
1418  if (rt->transport != RTSP_TRANSPORT_RDT)
1419  av_strlcat(transport, "unicast;", sizeof(transport));
1420  av_strlcatf(transport, sizeof(transport),
1421  "interleaved=%d-%d",
1422  interleave, interleave + 1);
1423  interleave += 2;
1424  }
1425 
1426  else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1427  snprintf(transport, sizeof(transport) - 1,
1428  "%s/UDP;multicast", trans_pref);
1429  }
1430  if (s->oformat) {
1431  av_strlcat(transport, ";mode=record", sizeof(transport));
1432  } else if (rt->server_type == RTSP_SERVER_REAL ||
1434  av_strlcat(transport, ";mode=play", sizeof(transport));
1435  snprintf(cmd, sizeof(cmd),
1436  "Transport: %s\r\n",
1437  transport);
1438  if (rt->accept_dynamic_rate)
1439  av_strlcat(cmd, "x-Dynamic-Rate: 0\r\n", sizeof(cmd));
1440  if (i == 0 && rt->server_type == RTSP_SERVER_REAL && CONFIG_RTPDEC) {
1441  char real_res[41], real_csum[9];
1442  ff_rdt_calc_response_and_checksum(real_res, real_csum,
1443  real_challenge);
1444  av_strlcatf(cmd, sizeof(cmd),
1445  "If-Match: %s\r\n"
1446  "RealChallenge2: %s, sd=%s\r\n",
1447  rt->session_id, real_res, real_csum);
1448  }
1449  ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1450  if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1451  err = 1;
1452  goto fail;
1453  } else if (reply->status_code != RTSP_STATUS_OK ||
1454  reply->nb_transports != 1) {
1455  err = AVERROR_INVALIDDATA;
1456  goto fail;
1457  }
1458 
1459  /* XXX: same protocol for all streams is required */
1460  if (i > 0) {
1461  if (reply->transports[0].lower_transport != rt->lower_transport ||
1462  reply->transports[0].transport != rt->transport) {
1463  err = AVERROR_INVALIDDATA;
1464  goto fail;
1465  }
1466  } else {
1467  rt->lower_transport = reply->transports[0].lower_transport;
1468  rt->transport = reply->transports[0].transport;
1469  }
1470 
1471  /* Fail if the server responded with another lower transport mode
1472  * than what we requested. */
1473  if (reply->transports[0].lower_transport != lower_transport) {
1474  av_log(s, AV_LOG_ERROR, "Nonmatching transport in server reply\n");
1475  err = AVERROR_INVALIDDATA;
1476  goto fail;
1477  }
1478 
1479  switch(reply->transports[0].lower_transport) {
1481  rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1482  rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1483  break;
1484 
1485  case RTSP_LOWER_TRANSPORT_UDP: {
1486  char url[1024], options[30] = "";
1487  const char *peer = host;
1488 
1489  if (rt->rtsp_flags & RTSP_FLAG_FILTER_SRC)
1490  av_strlcpy(options, "?connect=1", sizeof(options));
1491  /* Use source address if specified */
1492  if (reply->transports[0].source[0])
1493  peer = reply->transports[0].source;
1494  ff_url_join(url, sizeof(url), "rtp", NULL, peer,
1495  reply->transports[0].server_port_min, "%s", options);
1496  if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1497  ff_rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1498  err = AVERROR_INVALIDDATA;
1499  goto fail;
1500  }
1501  /* Try to initialize the connection state in a
1502  * potential NAT router by sending dummy packets.
1503  * RTP/RTCP dummy packets are used for RDT, too.
1504  */
1505  if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat &&
1506  CONFIG_RTPDEC)
1508  break;
1509  }
1511  char url[1024], namebuf[50], optbuf[20] = "";
1512  struct sockaddr_storage addr;
1513  int port, ttl;
1514 
1515  if (reply->transports[0].destination.ss_family) {
1516  addr = reply->transports[0].destination;
1517  port = reply->transports[0].port_min;
1518  ttl = reply->transports[0].ttl;
1519  } else {
1520  addr = rtsp_st->sdp_ip;
1521  port = rtsp_st->sdp_port;
1522  ttl = rtsp_st->sdp_ttl;
1523  }
1524  if (ttl > 0)
1525  snprintf(optbuf, sizeof(optbuf), "?ttl=%d", ttl);
1526  getnameinfo((struct sockaddr*) &addr, sizeof(addr),
1527  namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
1528  ff_url_join(url, sizeof(url), "rtp", NULL, namebuf,
1529  port, "%s", optbuf);
1530  if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
1531  &s->interrupt_callback, NULL) < 0) {
1532  err = AVERROR_INVALIDDATA;
1533  goto fail;
1534  }
1535  break;
1536  }
1537  }
1538 
1539  if ((err = ff_rtsp_open_transport_ctx(s, rtsp_st)))
1540  goto fail;
1541  }
1542 
1543  if (rt->nb_rtsp_streams && reply->timeout > 0)
1544  rt->timeout = reply->timeout;
1545 
1546  if (rt->server_type == RTSP_SERVER_REAL)
1547  rt->need_subscription = 1;
1548 
1549  return 0;
1550 
1551 fail:
1552  ff_rtsp_undo_setup(s, 0);
1553  return err;
1554 }
1555 
1557 {
1558  RTSPState *rt = s->priv_data;
1559  if (rt->rtsp_hd_out != rt->rtsp_hd) ffurl_close(rt->rtsp_hd_out);
1560  ffurl_close(rt->rtsp_hd);
1561  rt->rtsp_hd = rt->rtsp_hd_out = NULL;
1562 }
1563 
1565 {
1566  RTSPState *rt = s->priv_data;
1567  char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1568  int port, err, tcp_fd;
1569  RTSPMessageHeader reply1 = {0}, *reply = &reply1;
1570  int lower_transport_mask = 0;
1571  char real_challenge[64] = "";
1572  struct sockaddr_storage peer;
1573  socklen_t peer_len = sizeof(peer);
1574 
1575  if (rt->rtp_port_max < rt->rtp_port_min) {
1576  av_log(s, AV_LOG_ERROR, "Invalid UDP port range, max port %d less "
1577  "than min port %d\n", rt->rtp_port_max,
1578  rt->rtp_port_min);
1579  return AVERROR(EINVAL);
1580  }
1581 
1582  if (!ff_network_init())
1583  return AVERROR(EIO);
1584 
1585  if (s->max_delay < 0) /* Not set by the caller */
1587 
1592  }
1593  /* Only pass through valid flags from here */
1595 
1596 redirect:
1597  lower_transport_mask = rt->lower_transport_mask;
1598  /* extract hostname and port */
1599  av_url_split(NULL, 0, auth, sizeof(auth),
1600  host, sizeof(host), &port, path, sizeof(path), s->filename);
1601  if (*auth) {
1602  av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1603  }
1604  if (port < 0)
1605  port = RTSP_DEFAULT_PORT;
1606 
1607  if (!lower_transport_mask)
1608  lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1609 
1610  if (s->oformat) {
1611  /* Only UDP or TCP - UDP multicast isn't supported. */
1612  lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1613  (1 << RTSP_LOWER_TRANSPORT_TCP);
1614  if (!lower_transport_mask || rt->control_transport == RTSP_MODE_TUNNEL) {
1615  av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1616  "only UDP and TCP are supported for output.\n");
1617  err = AVERROR(EINVAL);
1618  goto fail;
1619  }
1620  }
1621 
1622  /* Construct the URI used in request; this is similar to s->filename,
1623  * but with authentication credentials removed and RTSP specific options
1624  * stripped out. */
1625  ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1626  host, port, "%s", path);
1627 
1628  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1629  /* set up initial handshake for tunneling */
1630  char httpname[1024];
1631  char sessioncookie[17];
1632  char headers[1024];
1633 
1634  ff_url_join(httpname, sizeof(httpname), "http", auth, host, port, "%s", path);
1635  snprintf(sessioncookie, sizeof(sessioncookie), "%08x%08x",
1637 
1638  /* GET requests */
1639  if (ffurl_alloc(&rt->rtsp_hd, httpname, AVIO_FLAG_READ,
1640  &s->interrupt_callback) < 0) {
1641  err = AVERROR(EIO);
1642  goto fail;
1643  }
1644 
1645  /* generate GET headers */
1646  snprintf(headers, sizeof(headers),
1647  "x-sessioncookie: %s\r\n"
1648  "Accept: application/x-rtsp-tunnelled\r\n"
1649  "Pragma: no-cache\r\n"
1650  "Cache-Control: no-cache\r\n",
1651  sessioncookie);
1652  av_opt_set(rt->rtsp_hd->priv_data, "headers", headers, 0);
1653 
1654  /* complete the connection */
1655  if (ffurl_connect(rt->rtsp_hd, NULL)) {
1656  err = AVERROR(EIO);
1657  goto fail;
1658  }
1659 
1660  /* POST requests */
1661  if (ffurl_alloc(&rt->rtsp_hd_out, httpname, AVIO_FLAG_WRITE,
1662  &s->interrupt_callback) < 0 ) {
1663  err = AVERROR(EIO);
1664  goto fail;
1665  }
1666 
1667  /* generate POST headers */
1668  snprintf(headers, sizeof(headers),
1669  "x-sessioncookie: %s\r\n"
1670  "Content-Type: application/x-rtsp-tunnelled\r\n"
1671  "Pragma: no-cache\r\n"
1672  "Cache-Control: no-cache\r\n"
1673  "Content-Length: 32767\r\n"
1674  "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
1675  sessioncookie);
1676  av_opt_set(rt->rtsp_hd_out->priv_data, "headers", headers, 0);
1677  av_opt_set(rt->rtsp_hd_out->priv_data, "chunked_post", "0", 0);
1678 
1679  /* Initialize the authentication state for the POST session. The HTTP
1680  * protocol implementation doesn't properly handle multi-pass
1681  * authentication for POST requests, since it would require one of
1682  * the following:
1683  * - implementing Expect: 100-continue, which many HTTP servers
1684  * don't support anyway, even less the RTSP servers that do HTTP
1685  * tunneling
1686  * - sending the whole POST data until getting a 401 reply specifying
1687  * what authentication method to use, then resending all that data
1688  * - waiting for potential 401 replies directly after sending the
1689  * POST header (waiting for some unspecified time)
1690  * Therefore, we copy the full auth state, which works for both basic
1691  * and digest. (For digest, we would have to synchronize the nonce
1692  * count variable between the two sessions, if we'd do more requests
1693  * with the original session, though.)
1694  */
1696 
1697  /* complete the connection */
1698  if (ffurl_connect(rt->rtsp_hd_out, NULL)) {
1699  err = AVERROR(EIO);
1700  goto fail;
1701  }
1702  } else {
1703  /* open the tcp connection */
1704  ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port,
1705  "?timeout=%d", rt->stimeout);
1706  if (ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
1707  &s->interrupt_callback, NULL) < 0) {
1708  err = AVERROR(EIO);
1709  goto fail;
1710  }
1711  rt->rtsp_hd_out = rt->rtsp_hd;
1712  }
1713  rt->seq = 0;
1714 
1715  tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
1716  if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1717  getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1718  NULL, 0, NI_NUMERICHOST);
1719  }
1720 
1721  /* request options supported by the server; this also detects server
1722  * type */
1723  for (rt->server_type = RTSP_SERVER_RTP;;) {
1724  cmd[0] = 0;
1725  if (rt->server_type == RTSP_SERVER_REAL)
1726  av_strlcat(cmd,
1727  /*
1728  * The following entries are required for proper
1729  * streaming from a Realmedia server. They are
1730  * interdependent in some way although we currently
1731  * don't quite understand how. Values were copied
1732  * from mplayer SVN r23589.
1733  * ClientChallenge is a 16-byte ID in hex
1734  * CompanyID is a 16-byte ID in base64
1735  */
1736  "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1737  "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1738  "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1739  "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1740  sizeof(cmd));
1741  ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1742  if (reply->status_code != RTSP_STATUS_OK) {
1743  err = AVERROR_INVALIDDATA;
1744  goto fail;
1745  }
1746 
1747  /* detect server type if not standard-compliant RTP */
1748  if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1750  continue;
1751  } else if (!av_strncasecmp(reply->server, "WMServer/", 9)) {
1753  } else if (rt->server_type == RTSP_SERVER_REAL)
1754  strcpy(real_challenge, reply->real_challenge);
1755  break;
1756  }
1757 
1758  if (s->iformat && CONFIG_RTSP_DEMUXER)
1759  err = ff_rtsp_setup_input_streams(s, reply);
1760  else if (CONFIG_RTSP_MUXER)
1761  err = ff_rtsp_setup_output_streams(s, host);
1762  if (err)
1763  goto fail;
1764 
1765  do {
1766  int lower_transport = ff_log2_tab[lower_transport_mask &
1767  ~(lower_transport_mask - 1)];
1768 
1769  err = ff_rtsp_make_setup_request(s, host, port, lower_transport,
1770  rt->server_type == RTSP_SERVER_REAL ?
1771  real_challenge : NULL);
1772  if (err < 0)
1773  goto fail;
1774  lower_transport_mask &= ~(1 << lower_transport);
1775  if (lower_transport_mask == 0 && err == 1) {
1776  err = AVERROR(EPROTONOSUPPORT);
1777  goto fail;
1778  }
1779  } while (err);
1780 
1781  rt->lower_transport_mask = lower_transport_mask;
1782  av_strlcpy(rt->real_challenge, real_challenge, sizeof(rt->real_challenge));
1783  rt->state = RTSP_STATE_IDLE;
1784  rt->seek_timestamp = 0; /* default is to start stream at position zero */
1785  return 0;
1786  fail:
1789  if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1790  av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1791  av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1792  reply->status_code,
1793  s->filename);
1794  goto redirect;
1795  }
1796  ff_network_close();
1797  return err;
1798 }
1799 #endif /* CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER */
1800 
1801 #if CONFIG_RTPDEC
1802 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1803  uint8_t *buf, int buf_size, int64_t wait_end)
1804 {
1805  RTSPState *rt = s->priv_data;
1806  RTSPStream *rtsp_st;
1807  int n, i, ret, tcp_fd, timeout_cnt = 0;
1808  int max_p = 0;
1809  struct pollfd *p = rt->p;
1810  int *fds = NULL, fdsnum, fdsidx;
1811 
1812  for (;;) {
1814  return AVERROR_EXIT;
1815  if (wait_end && wait_end - av_gettime() < 0)
1816  return AVERROR(EAGAIN);
1817  max_p = 0;
1818  if (rt->rtsp_hd) {
1819  tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
1820  p[max_p].fd = tcp_fd;
1821  p[max_p++].events = POLLIN;
1822  } else {
1823  tcp_fd = -1;
1824  }
1825  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1826  rtsp_st = rt->rtsp_streams[i];
1827  if (rtsp_st->rtp_handle) {
1828  if (ret = ffurl_get_multi_file_handle(rtsp_st->rtp_handle,
1829  &fds, &fdsnum)) {
1830  av_log(s, AV_LOG_ERROR, "Unable to recover rtp ports\n");
1831  return ret;
1832  }
1833  if (fdsnum != 2) {
1834  av_log(s, AV_LOG_ERROR,
1835  "Number of fds %d not supported\n", fdsnum);
1836  return AVERROR_INVALIDDATA;
1837  }
1838  for (fdsidx = 0; fdsidx < fdsnum; fdsidx++) {
1839  p[max_p].fd = fds[fdsidx];
1840  p[max_p++].events = POLLIN;
1841  }
1842  av_free(fds);
1843  }
1844  }
1845  n = poll(p, max_p, POLL_TIMEOUT_MS);
1846  if (n > 0) {
1847  int j = 1 - (tcp_fd == -1);
1848  timeout_cnt = 0;
1849  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1850  rtsp_st = rt->rtsp_streams[i];
1851  if (rtsp_st->rtp_handle) {
1852  if (p[j].revents & POLLIN || p[j+1].revents & POLLIN) {
1853  ret = ffurl_read(rtsp_st->rtp_handle, buf, buf_size);
1854  if (ret > 0) {
1855  *prtsp_st = rtsp_st;
1856  return ret;
1857  }
1858  }
1859  j+=2;
1860  }
1861  }
1862 #if CONFIG_RTSP_DEMUXER
1863  if (tcp_fd != -1 && p[0].revents & POLLIN) {
1864  if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
1865  if (rt->state == RTSP_STATE_STREAMING) {
1867  return AVERROR_EOF;
1868  else
1870  "Unable to answer to TEARDOWN\n");
1871  } else
1872  return 0;
1873  } else {
1874  RTSPMessageHeader reply;
1875  ret = ff_rtsp_read_reply(s, &reply, NULL, 0, NULL);
1876  if (ret < 0)
1877  return ret;
1878  /* XXX: parse message */
1879  if (rt->state != RTSP_STATE_STREAMING)
1880  return 0;
1881  }
1882  }
1883 #endif
1884  } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1885  return AVERROR(ETIMEDOUT);
1886  } else if (n < 0 && errno != EINTR)
1887  return AVERROR(errno);
1888  }
1889 }
1890 
1891 static int pick_stream(AVFormatContext *s, RTSPStream **rtsp_st,
1892  const uint8_t *buf, int len)
1893 {
1894  RTSPState *rt = s->priv_data;
1895  int i;
1896  if (len < 0)
1897  return len;
1898  if (rt->nb_rtsp_streams == 1) {
1899  *rtsp_st = rt->rtsp_streams[0];
1900  return len;
1901  }
1902  if (len >= 8 && rt->transport == RTSP_TRANSPORT_RTP) {
1903  if (RTP_PT_IS_RTCP(rt->recvbuf[1])) {
1904  int no_ssrc = 0;
1905  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1906  RTPDemuxContext *rtpctx = rt->rtsp_streams[i]->transport_priv;
1907  if (!rtpctx)
1908  continue;
1909  if (rtpctx->ssrc == AV_RB32(&buf[4])) {
1910  *rtsp_st = rt->rtsp_streams[i];
1911  return len;
1912  }
1913  if (!rtpctx->ssrc)
1914  no_ssrc = 1;
1915  }
1916  if (no_ssrc) {
1918  "Unable to pick stream for packet - SSRC not known for "
1919  "all streams\n");
1920  return AVERROR(EAGAIN);
1921  }
1922  } else {
1923  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1924  if ((buf[1] & 0x7f) == rt->rtsp_streams[i]->sdp_payload_type) {
1925  *rtsp_st = rt->rtsp_streams[i];
1926  return len;
1927  }
1928  }
1929  }
1930  }
1931  av_log(s, AV_LOG_WARNING, "Unable to pick stream for packet\n");
1932  return AVERROR(EAGAIN);
1933 }
1934 
1936 {
1937  RTSPState *rt = s->priv_data;
1938  int ret, len;
1939  RTSPStream *rtsp_st, *first_queue_st = NULL;
1940  int64_t wait_end = 0;
1941 
1942  if (rt->nb_byes == rt->nb_rtsp_streams)
1943  return AVERROR_EOF;
1944 
1945  /* get next frames from the same RTP packet */
1946  if (rt->cur_transport_priv) {
1947  if (rt->transport == RTSP_TRANSPORT_RDT) {
1948  ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1949  } else if (rt->transport == RTSP_TRANSPORT_RTP) {
1950  ret = ff_rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1951  } else if (rt->ts && CONFIG_RTPDEC) {
1952  ret = ff_mpegts_parse_packet(rt->ts, pkt, rt->recvbuf + rt->recvbuf_pos, rt->recvbuf_len - rt->recvbuf_pos);
1953  if (ret >= 0) {
1954  rt->recvbuf_pos += ret;
1955  ret = rt->recvbuf_pos < rt->recvbuf_len;
1956  }
1957  } else
1958  ret = -1;
1959  if (ret == 0) {
1960  rt->cur_transport_priv = NULL;
1961  return 0;
1962  } else if (ret == 1) {
1963  return 0;
1964  } else
1965  rt->cur_transport_priv = NULL;
1966  }
1967 
1968 redo:
1969  if (rt->transport == RTSP_TRANSPORT_RTP) {
1970  int i;
1971  int64_t first_queue_time = 0;
1972  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1973  RTPDemuxContext *rtpctx = rt->rtsp_streams[i]->transport_priv;
1974  int64_t queue_time;
1975  if (!rtpctx)
1976  continue;
1977  queue_time = ff_rtp_queued_packet_time(rtpctx);
1978  if (queue_time && (queue_time - first_queue_time < 0 ||
1979  !first_queue_time)) {
1980  first_queue_time = queue_time;
1981  first_queue_st = rt->rtsp_streams[i];
1982  }
1983  }
1984  if (first_queue_time) {
1985  wait_end = first_queue_time + s->max_delay;
1986  } else {
1987  wait_end = 0;
1988  first_queue_st = NULL;
1989  }
1990  }
1991 
1992  /* read next RTP packet */
1993  if (!rt->recvbuf) {
1995  if (!rt->recvbuf)
1996  return AVERROR(ENOMEM);
1997  }
1998 
1999  switch(rt->lower_transport) {
2000  default:
2001 #if CONFIG_RTSP_DEMUXER
2003  len = ff_rtsp_tcp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE);
2004  break;
2005 #endif
2008  len = udp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE, wait_end);
2009  if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
2010  ff_rtp_check_and_send_back_rr(rtsp_st->transport_priv, rtsp_st->rtp_handle, NULL, len);
2011  break;
2013  if (first_queue_st && rt->transport == RTSP_TRANSPORT_RTP &&
2014  wait_end && wait_end < av_gettime())
2015  len = AVERROR(EAGAIN);
2016  else
2017  len = ffio_read_partial(s->pb, rt->recvbuf, RECVBUF_SIZE);
2018  len = pick_stream(s, &rtsp_st, rt->recvbuf, len);
2019  if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
2020  ff_rtp_check_and_send_back_rr(rtsp_st->transport_priv, NULL, s->pb, len);
2021  break;
2022  }
2023  if (len == AVERROR(EAGAIN) && first_queue_st &&
2024  rt->transport == RTSP_TRANSPORT_RTP) {
2025  rtsp_st = first_queue_st;
2026  ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, NULL, 0);
2027  goto end;
2028  }
2029  if (len < 0)
2030  return len;
2031  if (len == 0)
2032  return AVERROR_EOF;
2033  if (rt->transport == RTSP_TRANSPORT_RDT) {
2034  ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
2035  } else if (rt->transport == RTSP_TRANSPORT_RTP) {
2036  ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
2037  if (rtsp_st->feedback) {
2038  AVIOContext *pb = NULL;
2040  pb = s->pb;
2041  ff_rtp_send_rtcp_feedback(rtsp_st->transport_priv, rtsp_st->rtp_handle, pb);
2042  }
2043  if (ret < 0) {
2044  /* Either bad packet, or a RTCP packet. Check if the
2045  * first_rtcp_ntp_time field was initialized. */
2046  RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
2047  if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
2048  /* first_rtcp_ntp_time has been initialized for this stream,
2049  * copy the same value to all other uninitialized streams,
2050  * in order to map their timestamp origin to the same ntp time
2051  * as this one. */
2052  int i;
2053  AVStream *st = NULL;
2054  if (rtsp_st->stream_index >= 0)
2055  st = s->streams[rtsp_st->stream_index];
2056  for (i = 0; i < rt->nb_rtsp_streams; i++) {
2057  RTPDemuxContext *rtpctx2 = rt->rtsp_streams[i]->transport_priv;
2058  AVStream *st2 = NULL;
2059  if (rt->rtsp_streams[i]->stream_index >= 0)
2060  st2 = s->streams[rt->rtsp_streams[i]->stream_index];
2061  if (rtpctx2 && st && st2 &&
2062  rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
2063  rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
2064  rtpctx2->rtcp_ts_offset = av_rescale_q(
2065  rtpctx->rtcp_ts_offset, st->time_base,
2066  st2->time_base);
2067  }
2068  }
2069  }
2070  if (ret == -RTCP_BYE) {
2071  rt->nb_byes++;
2072 
2073  av_log(s, AV_LOG_DEBUG, "Received BYE for stream %d (%d/%d)\n",
2074  rtsp_st->stream_index, rt->nb_byes, rt->nb_rtsp_streams);
2075 
2076  if (rt->nb_byes == rt->nb_rtsp_streams)
2077  return AVERROR_EOF;
2078  }
2079  }
2080  } else if (rt->ts && CONFIG_RTPDEC) {
2081  ret = ff_mpegts_parse_packet(rt->ts, pkt, rt->recvbuf, len);
2082  if (ret >= 0) {
2083  if (ret < len) {
2084  rt->recvbuf_len = len;
2085  rt->recvbuf_pos = ret;
2086  rt->cur_transport_priv = rt->ts;
2087  return 1;
2088  } else {
2089  ret = 0;
2090  }
2091  }
2092  } else {
2093  return AVERROR_INVALIDDATA;
2094  }
2095 end:
2096  if (ret < 0)
2097  goto redo;
2098  if (ret == 1)
2099  /* more packets may follow, so we save the RTP context */
2100  rt->cur_transport_priv = rtsp_st->transport_priv;
2101 
2102  return ret;
2103 }
2104 #endif /* CONFIG_RTPDEC */
2105 
2106 #if CONFIG_SDP_DEMUXER
2107 static int sdp_probe(AVProbeData *p1)
2108 {
2109  const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
2110 
2111  /* we look for a line beginning "c=IN IP" */
2112  while (p < p_end && *p != '\0') {
2113  if (p + sizeof("c=IN IP") - 1 < p_end &&
2114  av_strstart(p, "c=IN IP", NULL))
2115  return AVPROBE_SCORE_EXTENSION;
2116 
2117  while (p < p_end - 1 && *p != '\n') p++;
2118  if (++p >= p_end)
2119  break;
2120  if (*p == '\r')
2121  p++;
2122  }
2123  return 0;
2124 }
2125 
2126 static void append_source_addrs(char *buf, int size, const char *name,
2127  int count, struct RTSPSource **addrs)
2128 {
2129  int i;
2130  if (!count)
2131  return;
2132  av_strlcatf(buf, size, "&%s=%s", name, addrs[0]->addr);
2133  for (i = 1; i < count; i++)
2134  av_strlcatf(buf, size, ",%s", addrs[i]->addr);
2135 }
2136 
2137 static int sdp_read_header(AVFormatContext *s)
2138 {
2139  RTSPState *rt = s->priv_data;
2140  RTSPStream *rtsp_st;
2141  int size, i, err;
2142  char *content;
2143  char url[1024];
2144 
2145  if (!ff_network_init())
2146  return AVERROR(EIO);
2147 
2148  if (s->max_delay < 0) /* Not set by the caller */
2150  if (rt->rtsp_flags & RTSP_FLAG_CUSTOM_IO)
2152 
2153  /* read the whole sdp file */
2154  /* XXX: better loading */
2155  content = av_malloc(SDP_MAX_SIZE);
2156  size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);
2157  if (size <= 0) {
2158  av_free(content);
2159  return AVERROR_INVALIDDATA;
2160  }
2161  content[size] ='\0';
2162 
2163  err = ff_sdp_parse(s, content);
2164  av_free(content);
2165  if (err) goto fail;
2166 
2167  /* open each RTP stream */
2168  for (i = 0; i < rt->nb_rtsp_streams; i++) {
2169  char namebuf[50];
2170  rtsp_st = rt->rtsp_streams[i];
2171 
2172  if (!(rt->rtsp_flags & RTSP_FLAG_CUSTOM_IO)) {
2173  getnameinfo((struct sockaddr*) &rtsp_st->sdp_ip, sizeof(rtsp_st->sdp_ip),
2174  namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
2175  ff_url_join(url, sizeof(url), "rtp", NULL,
2176  namebuf, rtsp_st->sdp_port,
2177  "?localport=%d&ttl=%d&connect=%d&write_to_source=%d",
2178  rtsp_st->sdp_port, rtsp_st->sdp_ttl,
2179  rt->rtsp_flags & RTSP_FLAG_FILTER_SRC ? 1 : 0,
2180  rt->rtsp_flags & RTSP_FLAG_RTCP_TO_SOURCE ? 1 : 0);
2181 
2182  append_source_addrs(url, sizeof(url), "sources",
2183  rtsp_st->nb_include_source_addrs,
2184  rtsp_st->include_source_addrs);
2185  append_source_addrs(url, sizeof(url), "block",
2186  rtsp_st->nb_exclude_source_addrs,
2187  rtsp_st->exclude_source_addrs);
2188  if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
2189  &s->interrupt_callback, NULL) < 0) {
2190  err = AVERROR_INVALIDDATA;
2191  goto fail;
2192  }
2193  }
2194  if ((err = ff_rtsp_open_transport_ctx(s, rtsp_st)))
2195  goto fail;
2196  }
2197  return 0;
2198 fail:
2200  ff_network_close();
2201  return err;
2202 }
2203 
2204 static int sdp_read_close(AVFormatContext *s)
2205 {
2207  ff_network_close();
2208  return 0;
2209 }
2210 
2211 static const AVClass sdp_demuxer_class = {
2212  .class_name = "SDP demuxer",
2213  .item_name = av_default_item_name,
2214  .option = sdp_options,
2215  .version = LIBAVUTIL_VERSION_INT,
2216 };
2217 
2218 AVInputFormat ff_sdp_demuxer = {
2219  .name = "sdp",
2220  .long_name = NULL_IF_CONFIG_SMALL("SDP"),
2221  .priv_data_size = sizeof(RTSPState),
2222  .read_probe = sdp_probe,
2223  .read_header = sdp_read_header,
2225  .read_close = sdp_read_close,
2226  .priv_class = &sdp_demuxer_class,
2227 };
2228 #endif /* CONFIG_SDP_DEMUXER */
2229 
2230 #if CONFIG_RTP_DEMUXER
2231 static int rtp_probe(AVProbeData *p)
2232 {
2233  if (av_strstart(p->filename, "rtp:", NULL))
2234  return AVPROBE_SCORE_MAX;
2235  return 0;
2236 }
2237 
2238 static int rtp_read_header(AVFormatContext *s)
2239 {
2240  uint8_t recvbuf[RTP_MAX_PACKET_LENGTH];
2241  char host[500], sdp[500];
2242  int ret, port;
2243  URLContext* in = NULL;
2244  int payload_type;
2245  AVCodecContext codec = { 0 };
2246  struct sockaddr_storage addr;
2247  AVIOContext pb;
2248  socklen_t addrlen = sizeof(addr);
2249  RTSPState *rt = s->priv_data;
2250 
2251  if (!ff_network_init())
2252  return AVERROR(EIO);
2253 
2254  ret = ffurl_open(&in, s->filename, AVIO_FLAG_READ,
2255  &s->interrupt_callback, NULL);
2256  if (ret)
2257  goto fail;
2258 
2259  while (1) {
2260  ret = ffurl_read(in, recvbuf, sizeof(recvbuf));
2261  if (ret == AVERROR(EAGAIN))
2262  continue;
2263  if (ret < 0)
2264  goto fail;
2265  if (ret < 12) {
2266  av_log(s, AV_LOG_WARNING, "Received too short packet\n");
2267  continue;
2268  }
2269 
2270  if ((recvbuf[0] & 0xc0) != 0x80) {
2271  av_log(s, AV_LOG_WARNING, "Unsupported RTP version packet "
2272  "received\n");
2273  continue;
2274  }
2275 
2276  if (RTP_PT_IS_RTCP(recvbuf[1]))
2277  continue;
2278 
2279  payload_type = recvbuf[1] & 0x7f;
2280  break;
2281  }
2282  getsockname(ffurl_get_file_handle(in), (struct sockaddr*) &addr, &addrlen);
2283  ffurl_close(in);
2284  in = NULL;
2285 
2286  if (ff_rtp_get_codec_info(&codec, payload_type)) {
2287  av_log(s, AV_LOG_ERROR, "Unable to receive RTP payload type %d "
2288  "without an SDP file describing it\n",
2289  payload_type);
2290  goto fail;
2291  }
2292  if (codec.codec_type != AVMEDIA_TYPE_DATA) {
2293  av_log(s, AV_LOG_WARNING, "Guessing on RTP content - if not received "
2294  "properly you need an SDP file "
2295  "describing it\n");
2296  }
2297 
2298  av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port,
2299  NULL, 0, s->filename);
2300 
2301  snprintf(sdp, sizeof(sdp),
2302  "v=0\r\nc=IN IP%d %s\r\nm=%s %d RTP/AVP %d\r\n",
2303  addr.ss_family == AF_INET ? 4 : 6, host,
2304  codec.codec_type == AVMEDIA_TYPE_DATA ? "application" :
2305  codec.codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio",
2306  port, payload_type);
2307  av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
2308 
2309  ffio_init_context(&pb, sdp, strlen(sdp), 0, NULL, NULL, NULL, NULL);
2310  s->pb = &pb;
2311 
2312  /* sdp_read_header initializes this again */
2313  ff_network_close();
2314 
2315  rt->media_type_mask = (1 << (AVMEDIA_TYPE_DATA+1)) - 1;
2316 
2317  ret = sdp_read_header(s);
2318  s->pb = NULL;
2319  return ret;
2320 
2321 fail:
2322  if (in)
2323  ffurl_close(in);
2324  ff_network_close();
2325  return ret;
2326 }
2327 
2328 static const AVClass rtp_demuxer_class = {
2329  .class_name = "RTP demuxer",
2330  .item_name = av_default_item_name,
2331  .option = rtp_options,
2332  .version = LIBAVUTIL_VERSION_INT,
2333 };
2334 
2335 AVInputFormat ff_rtp_demuxer = {
2336  .name = "rtp",
2337  .long_name = NULL_IF_CONFIG_SMALL("RTP input"),
2338  .priv_data_size = sizeof(RTSPState),
2339  .read_probe = rtp_probe,
2340  .read_header = rtp_read_header,
2342  .read_close = sdp_read_close,
2343  .flags = AVFMT_NOFILE,
2344  .priv_class = &rtp_demuxer_class,
2345 };
2346 #endif /* CONFIG_RTP_DEMUXER */