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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  { "prefer_tcp", "try RTP via TCP first, if available", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_PREFER_TCP}, 0, 0, DEC|ENC, "rtsp_flags" },
90  RTSP_MEDIATYPE_OPTS("allowed_media_types", "set media types to accept from the server"),
91  { "min_port", "set minimum local UDP port", OFFSET(rtp_port_min), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MIN}, 0, 65535, DEC|ENC },
92  { "max_port", "set maximum local UDP port", OFFSET(rtp_port_max), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MAX}, 0, 65535, DEC|ENC },
93  { "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 },
94  { "stimeout", "set timeout (in microseconds) of socket TCP I/O operations", OFFSET(stimeout), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
96  { "user-agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT}, 0, 0, DEC },
97  { NULL },
98 };
99 
100 static const AVOption sdp_options[] = {
101  RTSP_FLAG_OPTS("sdp_flags", "SDP flags"),
102  { "custom_io", "use custom I/O", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_CUSTOM_IO}, 0, 0, DEC, "rtsp_flags" },
103  { "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" },
104  RTSP_MEDIATYPE_OPTS("allowed_media_types", "set media types to accept from the server"),
106  { NULL },
107 };
108 
109 static const AVOption rtp_options[] = {
110  RTSP_FLAG_OPTS("rtp_flags", "set RTP flags"),
112  { NULL },
113 };
114 
115 static void get_word_until_chars(char *buf, int buf_size,
116  const char *sep, const char **pp)
117 {
118  const char *p;
119  char *q;
120 
121  p = *pp;
122  p += strspn(p, SPACE_CHARS);
123  q = buf;
124  while (!strchr(sep, *p) && *p != '\0') {
125  if ((q - buf) < buf_size - 1)
126  *q++ = *p;
127  p++;
128  }
129  if (buf_size > 0)
130  *q = '\0';
131  *pp = p;
132 }
133 
134 static void get_word_sep(char *buf, int buf_size, const char *sep,
135  const char **pp)
136 {
137  if (**pp == '/') (*pp)++;
138  get_word_until_chars(buf, buf_size, sep, pp);
139 }
140 
141 static void get_word(char *buf, int buf_size, const char **pp)
142 {
143  get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
144 }
145 
146 /** Parse a string p in the form of Range:npt=xx-xx, and determine the start
147  * and end time.
148  * Used for seeking in the rtp stream.
149  */
150 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
151 {
152  char buf[256];
153 
154  p += strspn(p, SPACE_CHARS);
155  if (!av_stristart(p, "npt=", &p))
156  return;
157 
158  *start = AV_NOPTS_VALUE;
159  *end = AV_NOPTS_VALUE;
160 
161  get_word_sep(buf, sizeof(buf), "-", &p);
162  av_parse_time(start, buf, 1);
163  if (*p == '-') {
164  p++;
165  get_word_sep(buf, sizeof(buf), "-", &p);
166  av_parse_time(end, buf, 1);
167  }
168 }
169 
170 static int get_sockaddr(const char *buf, struct sockaddr_storage *sock)
171 {
172  struct addrinfo hints = { 0 }, *ai = NULL;
173  hints.ai_flags = AI_NUMERICHOST;
174  if (getaddrinfo(buf, NULL, &hints, &ai))
175  return -1;
176  memcpy(sock, ai->ai_addr, FFMIN(sizeof(*sock), ai->ai_addrlen));
177  freeaddrinfo(ai);
178  return 0;
179 }
180 
181 #if CONFIG_RTPDEC
182 static void init_rtp_handler(RTPDynamicProtocolHandler *handler,
183  RTSPStream *rtsp_st, AVCodecContext *codec)
184 {
185  if (!handler)
186  return;
187  if (codec)
188  codec->codec_id = handler->codec_id;
189  rtsp_st->dynamic_handler = handler;
190  if (handler->alloc) {
191  rtsp_st->dynamic_protocol_context = handler->alloc();
192  if (!rtsp_st->dynamic_protocol_context)
193  rtsp_st->dynamic_handler = NULL;
194  }
195 }
196 
197 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
198 static int sdp_parse_rtpmap(AVFormatContext *s,
199  AVStream *st, RTSPStream *rtsp_st,
200  int payload_type, const char *p)
201 {
202  AVCodecContext *codec = st->codec;
203  char buf[256];
204  int i;
205  AVCodec *c;
206  const char *c_name;
207 
208  /* See if we can handle this kind of payload.
209  * The space should normally not be there but some Real streams or
210  * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
211  * have a trailing space. */
212  get_word_sep(buf, sizeof(buf), "/ ", &p);
213  if (payload_type < RTP_PT_PRIVATE) {
214  /* We are in a standard case
215  * (from http://www.iana.org/assignments/rtp-parameters). */
216  codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
217  }
218 
219  if (codec->codec_id == AV_CODEC_ID_NONE) {
220  RTPDynamicProtocolHandler *handler =
222  init_rtp_handler(handler, rtsp_st, codec);
223  /* If no dynamic handler was found, check with the list of standard
224  * allocated types, if such a stream for some reason happens to
225  * use a private payload type. This isn't handled in rtpdec.c, since
226  * the format name from the rtpmap line never is passed into rtpdec. */
227  if (!rtsp_st->dynamic_handler)
228  codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
229  }
230 
231  c = avcodec_find_decoder(codec->codec_id);
232  if (c && c->name)
233  c_name = c->name;
234  else
235  c_name = "(null)";
236 
237  get_word_sep(buf, sizeof(buf), "/", &p);
238  i = atoi(buf);
239  switch (codec->codec_type) {
240  case AVMEDIA_TYPE_AUDIO:
241  av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
244  if (i > 0) {
245  codec->sample_rate = i;
246  avpriv_set_pts_info(st, 32, 1, codec->sample_rate);
247  get_word_sep(buf, sizeof(buf), "/", &p);
248  i = atoi(buf);
249  if (i > 0)
250  codec->channels = i;
251  }
252  av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
253  codec->sample_rate);
254  av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
255  codec->channels);
256  break;
257  case AVMEDIA_TYPE_VIDEO:
258  av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
259  if (i > 0)
260  avpriv_set_pts_info(st, 32, 1, i);
261  break;
262  default:
263  break;
264  }
265  if (rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->init)
266  rtsp_st->dynamic_handler->init(s, st->index,
267  rtsp_st->dynamic_protocol_context);
268  return 0;
269 }
270 
271 /* parse the attribute line from the fmtp a line of an sdp response. This
272  * is broken out as a function because it is used in rtp_h264.c, which is
273  * forthcoming. */
274 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
275  char *value, int value_size)
276 {
277  *p += strspn(*p, SPACE_CHARS);
278  if (**p) {
279  get_word_sep(attr, attr_size, "=", p);
280  if (**p == '=')
281  (*p)++;
282  get_word_sep(value, value_size, ";", p);
283  if (**p == ';')
284  (*p)++;
285  return 1;
286  }
287  return 0;
288 }
289 
290 typedef struct SDPParseState {
291  /* SDP only */
292  struct sockaddr_storage default_ip;
293  int default_ttl;
294  int skip_media; ///< set if an unknown m= line occurs
295  int nb_default_include_source_addrs; /**< Number of source-specific multicast include source IP address (from SDP content) */
296  struct RTSPSource **default_include_source_addrs; /**< Source-specific multicast include source IP address (from SDP content) */
297  int nb_default_exclude_source_addrs; /**< Number of source-specific multicast exclude source IP address (from SDP content) */
298  struct RTSPSource **default_exclude_source_addrs; /**< Source-specific multicast exclude source IP address (from SDP content) */
299  int seen_rtpmap;
300  int seen_fmtp;
301  char delayed_fmtp[2048];
302 } SDPParseState;
303 
304 static void copy_default_source_addrs(struct RTSPSource **addrs, int count,
305  struct RTSPSource ***dest, int *dest_count)
306 {
307  RTSPSource *rtsp_src, *rtsp_src2;
308  int i;
309  for (i = 0; i < count; i++) {
310  rtsp_src = addrs[i];
311  rtsp_src2 = av_malloc(sizeof(*rtsp_src2));
312  if (!rtsp_src2)
313  continue;
314  memcpy(rtsp_src2, rtsp_src, sizeof(*rtsp_src));
315  dynarray_add(dest, dest_count, rtsp_src2);
316  }
317 }
318 
319 static void parse_fmtp(AVFormatContext *s, RTSPState *rt,
320  int payload_type, const char *line)
321 {
322  int i;
323 
324  for (i = 0; i < rt->nb_rtsp_streams; i++) {
325  RTSPStream *rtsp_st = rt->rtsp_streams[i];
326  if (rtsp_st->sdp_payload_type == payload_type &&
327  rtsp_st->dynamic_handler &&
328  rtsp_st->dynamic_handler->parse_sdp_a_line) {
329  rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
330  rtsp_st->dynamic_protocol_context, line);
331  }
332  }
333 }
334 
335 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
336  int letter, const char *buf)
337 {
338  RTSPState *rt = s->priv_data;
339  char buf1[64], st_type[64];
340  const char *p;
341  enum AVMediaType codec_type;
342  int payload_type;
343  AVStream *st;
344  RTSPStream *rtsp_st;
345  RTSPSource *rtsp_src;
346  struct sockaddr_storage sdp_ip;
347  int ttl;
348 
349  av_dlog(s, "sdp: %c='%s'\n", letter, buf);
350 
351  p = buf;
352  if (s1->skip_media && letter != 'm')
353  return;
354  switch (letter) {
355  case 'c':
356  get_word(buf1, sizeof(buf1), &p);
357  if (strcmp(buf1, "IN") != 0)
358  return;
359  get_word(buf1, sizeof(buf1), &p);
360  if (strcmp(buf1, "IP4") && strcmp(buf1, "IP6"))
361  return;
362  get_word_sep(buf1, sizeof(buf1), "/", &p);
363  if (get_sockaddr(buf1, &sdp_ip))
364  return;
365  ttl = 16;
366  if (*p == '/') {
367  p++;
368  get_word_sep(buf1, sizeof(buf1), "/", &p);
369  ttl = atoi(buf1);
370  }
371  if (s->nb_streams == 0) {
372  s1->default_ip = sdp_ip;
373  s1->default_ttl = ttl;
374  } else {
375  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
376  rtsp_st->sdp_ip = sdp_ip;
377  rtsp_st->sdp_ttl = ttl;
378  }
379  break;
380  case 's':
381  av_dict_set(&s->metadata, "title", p, 0);
382  break;
383  case 'i':
384  if (s->nb_streams == 0) {
385  av_dict_set(&s->metadata, "comment", p, 0);
386  break;
387  }
388  break;
389  case 'm':
390  /* new stream */
391  s1->skip_media = 0;
392  s1->seen_fmtp = 0;
393  s1->seen_rtpmap = 0;
394  codec_type = AVMEDIA_TYPE_UNKNOWN;
395  get_word(st_type, sizeof(st_type), &p);
396  if (!strcmp(st_type, "audio")) {
397  codec_type = AVMEDIA_TYPE_AUDIO;
398  } else if (!strcmp(st_type, "video")) {
399  codec_type = AVMEDIA_TYPE_VIDEO;
400  } else if (!strcmp(st_type, "application")) {
401  codec_type = AVMEDIA_TYPE_DATA;
402  }
403  if (codec_type == AVMEDIA_TYPE_UNKNOWN || !(rt->media_type_mask & (1 << codec_type))) {
404  s1->skip_media = 1;
405  return;
406  }
407  rtsp_st = av_mallocz(sizeof(RTSPStream));
408  if (!rtsp_st)
409  return;
410  rtsp_st->stream_index = -1;
411  dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
412 
413  rtsp_st->sdp_ip = s1->default_ip;
414  rtsp_st->sdp_ttl = s1->default_ttl;
415 
416  copy_default_source_addrs(s1->default_include_source_addrs,
417  s1->nb_default_include_source_addrs,
418  &rtsp_st->include_source_addrs,
419  &rtsp_st->nb_include_source_addrs);
420  copy_default_source_addrs(s1->default_exclude_source_addrs,
421  s1->nb_default_exclude_source_addrs,
422  &rtsp_st->exclude_source_addrs,
423  &rtsp_st->nb_exclude_source_addrs);
424 
425  get_word(buf1, sizeof(buf1), &p); /* port */
426  rtsp_st->sdp_port = atoi(buf1);
427 
428  get_word(buf1, sizeof(buf1), &p); /* protocol */
429  if (!strcmp(buf1, "udp"))
431  else if (strstr(buf1, "/AVPF") || strstr(buf1, "/SAVPF"))
432  rtsp_st->feedback = 1;
433 
434  /* XXX: handle list of formats */
435  get_word(buf1, sizeof(buf1), &p); /* format list */
436  rtsp_st->sdp_payload_type = atoi(buf1);
437 
438  if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
439  /* no corresponding stream */
440  if (rt->transport == RTSP_TRANSPORT_RAW) {
441  if (!rt->ts && CONFIG_RTPDEC)
442  rt->ts = avpriv_mpegts_parse_open(s);
443  } else {
445  handler = ff_rtp_handler_find_by_id(
447  init_rtp_handler(handler, rtsp_st, NULL);
448  if (handler && handler->init)
449  handler->init(s, -1, rtsp_st->dynamic_protocol_context);
450  }
451  } else if (rt->server_type == RTSP_SERVER_WMS &&
452  codec_type == AVMEDIA_TYPE_DATA) {
453  /* RTX stream, a stream that carries all the other actual
454  * audio/video streams. Don't expose this to the callers. */
455  } else {
456  st = avformat_new_stream(s, NULL);
457  if (!st)
458  return;
459  st->id = rt->nb_rtsp_streams - 1;
460  rtsp_st->stream_index = st->index;
461  st->codec->codec_type = codec_type;
462  if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
464  /* if standard payload type, we can find the codec right now */
466  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
467  st->codec->sample_rate > 0)
468  avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
469  /* Even static payload types may need a custom depacketizer */
470  handler = ff_rtp_handler_find_by_id(
471  rtsp_st->sdp_payload_type, st->codec->codec_type);
472  init_rtp_handler(handler, rtsp_st, st->codec);
473  if (handler && handler->init)
474  handler->init(s, st->index,
475  rtsp_st->dynamic_protocol_context);
476  }
477  }
478  /* put a default control url */
479  av_strlcpy(rtsp_st->control_url, rt->control_uri,
480  sizeof(rtsp_st->control_url));
481  break;
482  case 'a':
483  if (av_strstart(p, "control:", &p)) {
484  if (s->nb_streams == 0) {
485  if (!strncmp(p, "rtsp://", 7))
486  av_strlcpy(rt->control_uri, p,
487  sizeof(rt->control_uri));
488  } else {
489  char proto[32];
490  /* get the control url */
491  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
492 
493  /* XXX: may need to add full url resolution */
494  av_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
495  NULL, NULL, 0, p);
496  if (proto[0] == '\0') {
497  /* relative control URL */
498  if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
499  av_strlcat(rtsp_st->control_url, "/",
500  sizeof(rtsp_st->control_url));
501  av_strlcat(rtsp_st->control_url, p,
502  sizeof(rtsp_st->control_url));
503  } else
504  av_strlcpy(rtsp_st->control_url, p,
505  sizeof(rtsp_st->control_url));
506  }
507  } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
508  /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
509  get_word(buf1, sizeof(buf1), &p);
510  payload_type = atoi(buf1);
511  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
512  if (rtsp_st->stream_index >= 0) {
513  st = s->streams[rtsp_st->stream_index];
514  sdp_parse_rtpmap(s, st, rtsp_st, payload_type, p);
515  }
516  s1->seen_rtpmap = 1;
517  if (s1->seen_fmtp) {
518  parse_fmtp(s, rt, payload_type, s1->delayed_fmtp);
519  }
520  } else if (av_strstart(p, "fmtp:", &p) ||
521  av_strstart(p, "framesize:", &p)) {
522  // let dynamic protocol handlers have a stab at the line.
523  get_word(buf1, sizeof(buf1), &p);
524  payload_type = atoi(buf1);
525  if (s1->seen_rtpmap) {
526  parse_fmtp(s, rt, payload_type, buf);
527  } else {
528  s1->seen_fmtp = 1;
529  av_strlcpy(s1->delayed_fmtp, buf, sizeof(s1->delayed_fmtp));
530  }
531  } else if (av_strstart(p, "range:", &p)) {
532  int64_t start, end;
533 
534  // this is so that seeking on a streamed file can work.
535  rtsp_parse_range_npt(p, &start, &end);
536  s->start_time = start;
537  /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
538  s->duration = (end == AV_NOPTS_VALUE) ?
539  AV_NOPTS_VALUE : end - start;
540  } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
541  if (atoi(p) == 1)
543  } else if (av_strstart(p, "SampleRate:integer;", &p) &&
544  s->nb_streams > 0) {
545  st = s->streams[s->nb_streams - 1];
546  st->codec->sample_rate = atoi(p);
547  } else if (av_strstart(p, "crypto:", &p) && s->nb_streams > 0) {
548  // RFC 4568
549  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
550  get_word(buf1, sizeof(buf1), &p); // ignore tag
551  get_word(rtsp_st->crypto_suite, sizeof(rtsp_st->crypto_suite), &p);
552  p += strspn(p, SPACE_CHARS);
553  if (av_strstart(p, "inline:", &p))
554  get_word(rtsp_st->crypto_params, sizeof(rtsp_st->crypto_params), &p);
555  } else if (av_strstart(p, "source-filter:", &p)) {
556  int exclude = 0;
557  get_word(buf1, sizeof(buf1), &p);
558  if (strcmp(buf1, "incl") && strcmp(buf1, "excl"))
559  return;
560  exclude = !strcmp(buf1, "excl");
561 
562  get_word(buf1, sizeof(buf1), &p);
563  if (strcmp(buf1, "IN") != 0)
564  return;
565  get_word(buf1, sizeof(buf1), &p);
566  if (strcmp(buf1, "IP4") && strcmp(buf1, "IP6") && strcmp(buf1, "*"))
567  return;
568  // not checking that the destination address actually matches or is wildcard
569  get_word(buf1, sizeof(buf1), &p);
570 
571  while (*p != '\0') {
572  rtsp_src = av_mallocz(sizeof(*rtsp_src));
573  if (!rtsp_src)
574  return;
575  get_word(rtsp_src->addr, sizeof(rtsp_src->addr), &p);
576  if (exclude) {
577  if (s->nb_streams == 0) {
578  dynarray_add(&s1->default_exclude_source_addrs, &s1->nb_default_exclude_source_addrs, rtsp_src);
579  } else {
580  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
581  dynarray_add(&rtsp_st->exclude_source_addrs, &rtsp_st->nb_exclude_source_addrs, rtsp_src);
582  }
583  } else {
584  if (s->nb_streams == 0) {
585  dynarray_add(&s1->default_include_source_addrs, &s1->nb_default_include_source_addrs, rtsp_src);
586  } else {
587  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
588  dynarray_add(&rtsp_st->include_source_addrs, &rtsp_st->nb_include_source_addrs, rtsp_src);
589  }
590  }
591  }
592  } else {
593  if (rt->server_type == RTSP_SERVER_WMS)
595  if (s->nb_streams > 0) {
596  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
597 
598  if (rt->server_type == RTSP_SERVER_REAL)
599  ff_real_parse_sdp_a_line(s, rtsp_st->stream_index, p);
600 
601  if (rtsp_st->dynamic_handler &&
603  rtsp_st->dynamic_handler->parse_sdp_a_line(s,
604  rtsp_st->stream_index,
605  rtsp_st->dynamic_protocol_context, buf);
606  }
607  }
608  break;
609  }
610 }
611 
612 int ff_sdp_parse(AVFormatContext *s, const char *content)
613 {
614  RTSPState *rt = s->priv_data;
615  const char *p;
616  int letter, i;
617  /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
618  * contain long SDP lines containing complete ASF Headers (several
619  * kB) or arrays of MDPR (RM stream descriptor) headers plus
620  * "rulebooks" describing their properties. Therefore, the SDP line
621  * buffer is large.
622  *
623  * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
624  * in rtpdec_xiph.c. */
625  char buf[16384], *q;
626  SDPParseState sdp_parse_state = { { 0 } }, *s1 = &sdp_parse_state;
627 
628  p = content;
629  for (;;) {
630  p += strspn(p, SPACE_CHARS);
631  letter = *p;
632  if (letter == '\0')
633  break;
634  p++;
635  if (*p != '=')
636  goto next_line;
637  p++;
638  /* get the content */
639  q = buf;
640  while (*p != '\n' && *p != '\r' && *p != '\0') {
641  if ((q - buf) < sizeof(buf) - 1)
642  *q++ = *p;
643  p++;
644  }
645  *q = '\0';
646  sdp_parse_line(s, s1, letter, buf);
647  next_line:
648  while (*p != '\n' && *p != '\0')
649  p++;
650  if (*p == '\n')
651  p++;
652  }
653 
654  for (i = 0; i < s1->nb_default_include_source_addrs; i++)
655  av_free(s1->default_include_source_addrs[i]);
656  av_freep(&s1->default_include_source_addrs);
657  for (i = 0; i < s1->nb_default_exclude_source_addrs; i++)
658  av_free(s1->default_exclude_source_addrs[i]);
659  av_freep(&s1->default_exclude_source_addrs);
660 
661  rt->p = av_malloc_array(rt->nb_rtsp_streams + 1, sizeof(struct pollfd) * 2);
662  if (!rt->p) return AVERROR(ENOMEM);
663  return 0;
664 }
665 #endif /* CONFIG_RTPDEC */
666 
667 void ff_rtsp_undo_setup(AVFormatContext *s, int send_packets)
668 {
669  RTSPState *rt = s->priv_data;
670  int i;
671 
672  for (i = 0; i < rt->nb_rtsp_streams; i++) {
673  RTSPStream *rtsp_st = rt->rtsp_streams[i];
674  if (!rtsp_st)
675  continue;
676  if (rtsp_st->transport_priv) {
677  if (s->oformat) {
678  AVFormatContext *rtpctx = rtsp_st->transport_priv;
679  av_write_trailer(rtpctx);
681  uint8_t *ptr;
682  if (CONFIG_RTSP_MUXER && rtpctx->pb && send_packets)
683  ff_rtsp_tcp_write_packet(s, rtsp_st);
684  avio_close_dyn_buf(rtpctx->pb, &ptr);
685  av_free(ptr);
686  } else {
687  avio_close(rtpctx->pb);
688  }
689  avformat_free_context(rtpctx);
690  } else if (rt->transport == RTSP_TRANSPORT_RDT && CONFIG_RTPDEC)
692  else if (rt->transport == RTSP_TRANSPORT_RTP && CONFIG_RTPDEC)
694  }
695  rtsp_st->transport_priv = NULL;
696  if (rtsp_st->rtp_handle)
697  ffurl_close(rtsp_st->rtp_handle);
698  rtsp_st->rtp_handle = NULL;
699  }
700 }
701 
702 /* close and free RTSP streams */
704 {
705  RTSPState *rt = s->priv_data;
706  int i, j;
707  RTSPStream *rtsp_st;
708 
709  ff_rtsp_undo_setup(s, 0);
710  for (i = 0; i < rt->nb_rtsp_streams; i++) {
711  rtsp_st = rt->rtsp_streams[i];
712  if (rtsp_st) {
713  if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
714  rtsp_st->dynamic_handler->free(
715  rtsp_st->dynamic_protocol_context);
716  for (j = 0; j < rtsp_st->nb_include_source_addrs; j++)
717  av_free(rtsp_st->include_source_addrs[j]);
718  av_freep(&rtsp_st->include_source_addrs);
719  for (j = 0; j < rtsp_st->nb_exclude_source_addrs; j++)
720  av_free(rtsp_st->exclude_source_addrs[j]);
721  av_freep(&rtsp_st->exclude_source_addrs);
722 
723  av_free(rtsp_st);
724  }
725  }
726  av_free(rt->rtsp_streams);
727  if (rt->asf_ctx) {
729  }
730  if (rt->ts && CONFIG_RTPDEC)
732  av_free(rt->p);
733  av_free(rt->recvbuf);
734 }
735 
737 {
738  RTSPState *rt = s->priv_data;
739  AVStream *st = NULL;
740  int reordering_queue_size = rt->reordering_queue_size;
741  if (reordering_queue_size < 0) {
743  reordering_queue_size = 0;
744  else
745  reordering_queue_size = RTP_REORDER_QUEUE_DEFAULT_SIZE;
746  }
747 
748  /* open the RTP context */
749  if (rtsp_st->stream_index >= 0)
750  st = s->streams[rtsp_st->stream_index];
751  if (!st)
753 
754  if (s->oformat && CONFIG_RTSP_MUXER) {
756  s, st, rtsp_st->rtp_handle,
758  rtsp_st->stream_index);
759  /* Ownership of rtp_handle is passed to the rtp mux context */
760  rtsp_st->rtp_handle = NULL;
761  if (ret < 0)
762  return ret;
763  st->time_base = ((AVFormatContext*)rtsp_st->transport_priv)->streams[0]->time_base;
764  } else if (rt->transport == RTSP_TRANSPORT_RAW) {
765  return 0; // Don't need to open any parser here
766  } else if (rt->transport == RTSP_TRANSPORT_RDT && CONFIG_RTPDEC)
767  rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
768  rtsp_st->dynamic_protocol_context,
769  rtsp_st->dynamic_handler);
770  else if (CONFIG_RTPDEC)
771  rtsp_st->transport_priv = ff_rtp_parse_open(s, st,
772  rtsp_st->sdp_payload_type,
773  reordering_queue_size);
774 
775  if (!rtsp_st->transport_priv) {
776  return AVERROR(ENOMEM);
777  } else if (rt->transport == RTSP_TRANSPORT_RTP && CONFIG_RTPDEC) {
778  if (rtsp_st->dynamic_handler) {
780  rtsp_st->dynamic_protocol_context,
781  rtsp_st->dynamic_handler);
782  }
783  if (rtsp_st->crypto_suite[0])
785  rtsp_st->crypto_suite,
786  rtsp_st->crypto_params);
787  }
788 
789  return 0;
790 }
791 
792 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
793 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
794 {
795  const char *q;
796  char *p;
797  int v;
798 
799  q = *pp;
800  q += strspn(q, SPACE_CHARS);
801  v = strtol(q, &p, 10);
802  if (*p == '-') {
803  p++;
804  *min_ptr = v;
805  v = strtol(p, &p, 10);
806  *max_ptr = v;
807  } else {
808  *min_ptr = v;
809  *max_ptr = v;
810  }
811  *pp = p;
812 }
813 
814 /* XXX: only one transport specification is parsed */
815 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
816 {
817  char transport_protocol[16];
818  char profile[16];
819  char lower_transport[16];
820  char parameter[16];
822  char buf[256];
823 
824  reply->nb_transports = 0;
825 
826  for (;;) {
827  p += strspn(p, SPACE_CHARS);
828  if (*p == '\0')
829  break;
830 
831  th = &reply->transports[reply->nb_transports];
832 
833  get_word_sep(transport_protocol, sizeof(transport_protocol),
834  "/", &p);
835  if (!av_strcasecmp (transport_protocol, "rtp")) {
836  get_word_sep(profile, sizeof(profile), "/;,", &p);
837  lower_transport[0] = '\0';
838  /* rtp/avp/<protocol> */
839  if (*p == '/') {
840  get_word_sep(lower_transport, sizeof(lower_transport),
841  ";,", &p);
842  }
844  } else if (!av_strcasecmp (transport_protocol, "x-pn-tng") ||
845  !av_strcasecmp (transport_protocol, "x-real-rdt")) {
846  /* x-pn-tng/<protocol> */
847  get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
848  profile[0] = '\0';
850  } else if (!av_strcasecmp(transport_protocol, "raw")) {
851  get_word_sep(profile, sizeof(profile), "/;,", &p);
852  lower_transport[0] = '\0';
853  /* raw/raw/<protocol> */
854  if (*p == '/') {
855  get_word_sep(lower_transport, sizeof(lower_transport),
856  ";,", &p);
857  }
859  }
860  if (!av_strcasecmp(lower_transport, "TCP"))
862  else
864 
865  if (*p == ';')
866  p++;
867  /* get each parameter */
868  while (*p != '\0' && *p != ',') {
869  get_word_sep(parameter, sizeof(parameter), "=;,", &p);
870  if (!strcmp(parameter, "port")) {
871  if (*p == '=') {
872  p++;
873  rtsp_parse_range(&th->port_min, &th->port_max, &p);
874  }
875  } else if (!strcmp(parameter, "client_port")) {
876  if (*p == '=') {
877  p++;
878  rtsp_parse_range(&th->client_port_min,
879  &th->client_port_max, &p);
880  }
881  } else if (!strcmp(parameter, "server_port")) {
882  if (*p == '=') {
883  p++;
884  rtsp_parse_range(&th->server_port_min,
885  &th->server_port_max, &p);
886  }
887  } else if (!strcmp(parameter, "interleaved")) {
888  if (*p == '=') {
889  p++;
890  rtsp_parse_range(&th->interleaved_min,
891  &th->interleaved_max, &p);
892  }
893  } else if (!strcmp(parameter, "multicast")) {
896  } else if (!strcmp(parameter, "ttl")) {
897  if (*p == '=') {
898  char *end;
899  p++;
900  th->ttl = strtol(p, &end, 10);
901  p = end;
902  }
903  } else if (!strcmp(parameter, "destination")) {
904  if (*p == '=') {
905  p++;
906  get_word_sep(buf, sizeof(buf), ";,", &p);
907  get_sockaddr(buf, &th->destination);
908  }
909  } else if (!strcmp(parameter, "source")) {
910  if (*p == '=') {
911  p++;
912  get_word_sep(buf, sizeof(buf), ";,", &p);
913  av_strlcpy(th->source, buf, sizeof(th->source));
914  }
915  } else if (!strcmp(parameter, "mode")) {
916  if (*p == '=') {
917  p++;
918  get_word_sep(buf, sizeof(buf), ";, ", &p);
919  if (!strcmp(buf, "record") ||
920  !strcmp(buf, "receive"))
921  th->mode_record = 1;
922  }
923  }
924 
925  while (*p != ';' && *p != '\0' && *p != ',')
926  p++;
927  if (*p == ';')
928  p++;
929  }
930  if (*p == ',')
931  p++;
932 
933  reply->nb_transports++;
934  }
935 }
936 
937 static void handle_rtp_info(RTSPState *rt, const char *url,
938  uint32_t seq, uint32_t rtptime)
939 {
940  int i;
941  if (!rtptime || !url[0])
942  return;
943  if (rt->transport != RTSP_TRANSPORT_RTP)
944  return;
945  for (i = 0; i < rt->nb_rtsp_streams; i++) {
946  RTSPStream *rtsp_st = rt->rtsp_streams[i];
947  RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
948  if (!rtpctx)
949  continue;
950  if (!strcmp(rtsp_st->control_url, url)) {
951  rtpctx->base_timestamp = rtptime;
952  break;
953  }
954  }
955 }
956 
957 static void rtsp_parse_rtp_info(RTSPState *rt, const char *p)
958 {
959  int read = 0;
960  char key[20], value[1024], url[1024] = "";
961  uint32_t seq = 0, rtptime = 0;
962 
963  for (;;) {
964  p += strspn(p, SPACE_CHARS);
965  if (!*p)
966  break;
967  get_word_sep(key, sizeof(key), "=", &p);
968  if (*p != '=')
969  break;
970  p++;
971  get_word_sep(value, sizeof(value), ";, ", &p);
972  read++;
973  if (!strcmp(key, "url"))
974  av_strlcpy(url, value, sizeof(url));
975  else if (!strcmp(key, "seq"))
976  seq = strtoul(value, NULL, 10);
977  else if (!strcmp(key, "rtptime"))
978  rtptime = strtoul(value, NULL, 10);
979  if (*p == ',') {
980  handle_rtp_info(rt, url, seq, rtptime);
981  url[0] = '\0';
982  seq = rtptime = 0;
983  read = 0;
984  }
985  if (*p)
986  p++;
987  }
988  if (read > 0)
989  handle_rtp_info(rt, url, seq, rtptime);
990 }
991 
992 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
993  RTSPState *rt, const char *method)
994 {
995  const char *p;
996 
997  /* NOTE: we do case independent match for broken servers */
998  p = buf;
999  if (av_stristart(p, "Session:", &p)) {
1000  int t;
1001  get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
1002  if (av_stristart(p, ";timeout=", &p) &&
1003  (t = strtol(p, NULL, 10)) > 0) {
1004  reply->timeout = t;
1005  }
1006  } else if (av_stristart(p, "Content-Length:", &p)) {
1007  reply->content_length = strtol(p, NULL, 10);
1008  } else if (av_stristart(p, "Transport:", &p)) {
1009  rtsp_parse_transport(reply, p);
1010  } else if (av_stristart(p, "CSeq:", &p)) {
1011  reply->seq = strtol(p, NULL, 10);
1012  } else if (av_stristart(p, "Range:", &p)) {
1013  rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
1014  } else if (av_stristart(p, "RealChallenge1:", &p)) {
1015  p += strspn(p, SPACE_CHARS);
1016  av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
1017  } else if (av_stristart(p, "Server:", &p)) {
1018  p += strspn(p, SPACE_CHARS);
1019  av_strlcpy(reply->server, p, sizeof(reply->server));
1020  } else if (av_stristart(p, "Notice:", &p) ||
1021  av_stristart(p, "X-Notice:", &p)) {
1022  reply->notice = strtol(p, NULL, 10);
1023  } else if (av_stristart(p, "Location:", &p)) {
1024  p += strspn(p, SPACE_CHARS);
1025  av_strlcpy(reply->location, p , sizeof(reply->location));
1026  } else if (av_stristart(p, "WWW-Authenticate:", &p) && rt) {
1027  p += strspn(p, SPACE_CHARS);
1028  ff_http_auth_handle_header(&rt->auth_state, "WWW-Authenticate", p);
1029  } else if (av_stristart(p, "Authentication-Info:", &p) && rt) {
1030  p += strspn(p, SPACE_CHARS);
1031  ff_http_auth_handle_header(&rt->auth_state, "Authentication-Info", p);
1032  } else if (av_stristart(p, "Content-Base:", &p) && rt) {
1033  p += strspn(p, SPACE_CHARS);
1034  if (method && !strcmp(method, "DESCRIBE"))
1035  av_strlcpy(rt->control_uri, p , sizeof(rt->control_uri));
1036  } else if (av_stristart(p, "RTP-Info:", &p) && rt) {
1037  p += strspn(p, SPACE_CHARS);
1038  if (method && !strcmp(method, "PLAY"))
1039  rtsp_parse_rtp_info(rt, p);
1040  } else if (av_stristart(p, "Public:", &p) && rt) {
1041  if (strstr(p, "GET_PARAMETER") &&
1042  method && !strcmp(method, "OPTIONS"))
1043  rt->get_parameter_supported = 1;
1044  } else if (av_stristart(p, "x-Accept-Dynamic-Rate:", &p) && rt) {
1045  p += strspn(p, SPACE_CHARS);
1046  rt->accept_dynamic_rate = atoi(p);
1047  } else if (av_stristart(p, "Content-Type:", &p)) {
1048  p += strspn(p, SPACE_CHARS);
1049  av_strlcpy(reply->content_type, p, sizeof(reply->content_type));
1050  }
1051 }
1052 
1053 /* skip a RTP/TCP interleaved packet */
1055 {
1056  RTSPState *rt = s->priv_data;
1057  int ret, len, len1;
1058  uint8_t buf[1024];
1059 
1060  ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
1061  if (ret != 3)
1062  return;
1063  len = AV_RB16(buf + 1);
1064 
1065  av_dlog(s, "skipping RTP packet len=%d\n", len);
1066 
1067  /* skip payload */
1068  while (len > 0) {
1069  len1 = len;
1070  if (len1 > sizeof(buf))
1071  len1 = sizeof(buf);
1072  ret = ffurl_read_complete(rt->rtsp_hd, buf, len1);
1073  if (ret != len1)
1074  return;
1075  len -= len1;
1076  }
1077 }
1078 
1080  unsigned char **content_ptr,
1081  int return_on_interleaved_data, const char *method)
1082 {
1083  RTSPState *rt = s->priv_data;
1084  char buf[4096], buf1[1024], *q;
1085  unsigned char ch;
1086  const char *p;
1087  int ret, content_length, line_count = 0, request = 0;
1088  unsigned char *content = NULL;
1089 
1090 start:
1091  line_count = 0;
1092  request = 0;
1093  content = NULL;
1094  memset(reply, 0, sizeof(*reply));
1095 
1096  /* parse reply (XXX: use buffers) */
1097  rt->last_reply[0] = '\0';
1098  for (;;) {
1099  q = buf;
1100  for (;;) {
1101  ret = ffurl_read_complete(rt->rtsp_hd, &ch, 1);
1102  av_dlog(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
1103  if (ret != 1)
1104  return AVERROR_EOF;
1105  if (ch == '\n')
1106  break;
1107  if (ch == '$') {
1108  /* XXX: only parse it if first char on line ? */
1109  if (return_on_interleaved_data) {
1110  return 1;
1111  } else
1113  } else if (ch != '\r') {
1114  if ((q - buf) < sizeof(buf) - 1)
1115  *q++ = ch;
1116  }
1117  }
1118  *q = '\0';
1119 
1120  av_dlog(s, "line='%s'\n", buf);
1121 
1122  /* test if last line */
1123  if (buf[0] == '\0')
1124  break;
1125  p = buf;
1126  if (line_count == 0) {
1127  /* get reply code */
1128  get_word(buf1, sizeof(buf1), &p);
1129  if (!strncmp(buf1, "RTSP/", 5)) {
1130  get_word(buf1, sizeof(buf1), &p);
1131  reply->status_code = atoi(buf1);
1132  av_strlcpy(reply->reason, p, sizeof(reply->reason));
1133  } else {
1134  av_strlcpy(reply->reason, buf1, sizeof(reply->reason)); // method
1135  get_word(buf1, sizeof(buf1), &p); // object
1136  request = 1;
1137  }
1138  } else {
1139  ff_rtsp_parse_line(reply, p, rt, method);
1140  av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
1141  av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
1142  }
1143  line_count++;
1144  }
1145 
1146  if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0' && !request)
1147  av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
1148 
1149  content_length = reply->content_length;
1150  if (content_length > 0) {
1151  /* leave some room for a trailing '\0' (useful for simple parsing) */
1152  content = av_malloc(content_length + 1);
1153  ffurl_read_complete(rt->rtsp_hd, content, content_length);
1154  content[content_length] = '\0';
1155  }
1156  if (content_ptr)
1157  *content_ptr = content;
1158  else
1159  av_free(content);
1160 
1161  if (request) {
1162  char buf[1024];
1163  char base64buf[AV_BASE64_SIZE(sizeof(buf))];
1164  const char* ptr = buf;
1165 
1166  if (!strcmp(reply->reason, "OPTIONS")) {
1167  snprintf(buf, sizeof(buf), "RTSP/1.0 200 OK\r\n");
1168  if (reply->seq)
1169  av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", reply->seq);
1170  if (reply->session_id[0])
1171  av_strlcatf(buf, sizeof(buf), "Session: %s\r\n",
1172  reply->session_id);
1173  } else {
1174  snprintf(buf, sizeof(buf), "RTSP/1.0 501 Not Implemented\r\n");
1175  }
1176  av_strlcat(buf, "\r\n", sizeof(buf));
1177 
1178  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1179  av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
1180  ptr = base64buf;
1181  }
1182  ffurl_write(rt->rtsp_hd_out, ptr, strlen(ptr));
1183 
1184  rt->last_cmd_time = av_gettime();
1185  /* Even if the request from the server had data, it is not the data
1186  * that the caller wants or expects. The memory could also be leaked
1187  * if the actual following reply has content data. */
1188  if (content_ptr)
1189  av_freep(content_ptr);
1190  /* If method is set, this is called from ff_rtsp_send_cmd,
1191  * where a reply to exactly this request is awaited. For
1192  * callers from within packet receiving, we just want to
1193  * return to the caller and go back to receiving packets. */
1194  if (method)
1195  goto start;
1196  return 0;
1197  }
1198 
1199  if (rt->seq != reply->seq) {
1200  av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
1201  rt->seq, reply->seq);
1202  }
1203 
1204  /* EOS */
1205  if (reply->notice == 2101 /* End-of-Stream Reached */ ||
1206  reply->notice == 2104 /* Start-of-Stream Reached */ ||
1207  reply->notice == 2306 /* Continuous Feed Terminated */) {
1208  rt->state = RTSP_STATE_IDLE;
1209  } else if (reply->notice >= 4400 && reply->notice < 5500) {
1210  return AVERROR(EIO); /* data or server error */
1211  } else if (reply->notice == 2401 /* Ticket Expired */ ||
1212  (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
1213  return AVERROR(EPERM);
1214 
1215  return 0;
1216 }
1217 
1218 /**
1219  * Send a command to the RTSP server without waiting for the reply.
1220  *
1221  * @param s RTSP (de)muxer context
1222  * @param method the method for the request
1223  * @param url the target url for the request
1224  * @param headers extra header lines to include in the request
1225  * @param send_content if non-null, the data to send as request body content
1226  * @param send_content_length the length of the send_content data, or 0 if
1227  * send_content is null
1228  *
1229  * @return zero if success, nonzero otherwise
1230  */
1231 static int rtsp_send_cmd_with_content_async(AVFormatContext *s,
1232  const char *method, const char *url,
1233  const char *headers,
1234  const unsigned char *send_content,
1235  int send_content_length)
1236 {
1237  RTSPState *rt = s->priv_data;
1238  char buf[4096], *out_buf;
1239  char base64buf[AV_BASE64_SIZE(sizeof(buf))];
1240 
1241  /* Add in RTSP headers */
1242  out_buf = buf;
1243  rt->seq++;
1244  snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
1245  if (headers)
1246  av_strlcat(buf, headers, sizeof(buf));
1247  av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
1248  av_strlcatf(buf, sizeof(buf), "User-Agent: %s\r\n", rt->user_agent);
1249  if (rt->session_id[0] != '\0' && (!headers ||
1250  !strstr(headers, "\nIf-Match:"))) {
1251  av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
1252  }
1253  if (rt->auth[0]) {
1254  char *str = ff_http_auth_create_response(&rt->auth_state,
1255  rt->auth, url, method);
1256  if (str)
1257  av_strlcat(buf, str, sizeof(buf));
1258  av_free(str);
1259  }
1260  if (send_content_length > 0 && send_content)
1261  av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
1262  av_strlcat(buf, "\r\n", sizeof(buf));
1263 
1264  /* base64 encode rtsp if tunneling */
1265  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1266  av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
1267  out_buf = base64buf;
1268  }
1269 
1270  av_dlog(s, "Sending:\n%s--\n", buf);
1271 
1272  ffurl_write(rt->rtsp_hd_out, out_buf, strlen(out_buf));
1273  if (send_content_length > 0 && send_content) {
1274  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1275  av_log(s, AV_LOG_ERROR, "tunneling of RTSP requests "
1276  "with content data not supported\n");
1277  return AVERROR_PATCHWELCOME;
1278  }
1279  ffurl_write(rt->rtsp_hd_out, send_content, send_content_length);
1280  }
1281  rt->last_cmd_time = av_gettime();
1282 
1283  return 0;
1284 }
1285 
1286 int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
1287  const char *url, const char *headers)
1288 {
1289  return rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
1290 }
1291 
1292 int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
1293  const char *headers, RTSPMessageHeader *reply,
1294  unsigned char **content_ptr)
1295 {
1296  return ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
1297  content_ptr, NULL, 0);
1298 }
1299 
1301  const char *method, const char *url,
1302  const char *header,
1303  RTSPMessageHeader *reply,
1304  unsigned char **content_ptr,
1305  const unsigned char *send_content,
1306  int send_content_length)
1307 {
1308  RTSPState *rt = s->priv_data;
1309  HTTPAuthType cur_auth_type;
1310  int ret, attempts = 0;
1311 
1312 retry:
1313  cur_auth_type = rt->auth_state.auth_type;
1314  if ((ret = rtsp_send_cmd_with_content_async(s, method, url, header,
1315  send_content,
1316  send_content_length)))
1317  return ret;
1318 
1319  if ((ret = ff_rtsp_read_reply(s, reply, content_ptr, 0, method) ) < 0)
1320  return ret;
1321  attempts++;
1322 
1323  if (reply->status_code == 401 &&
1324  (cur_auth_type == HTTP_AUTH_NONE || rt->auth_state.stale) &&
1325  rt->auth_state.auth_type != HTTP_AUTH_NONE && attempts < 2)
1326  goto retry;
1327 
1328  if (reply->status_code > 400){
1329  av_log(s, AV_LOG_ERROR, "method %s failed: %d%s\n",
1330  method,
1331  reply->status_code,
1332  reply->reason);
1333  av_log(s, AV_LOG_DEBUG, "%s\n", rt->last_reply);
1334  }
1335 
1336  return 0;
1337 }
1338 
1339 int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
1340  int lower_transport, const char *real_challenge)
1341 {
1342  RTSPState *rt = s->priv_data;
1343  int rtx = 0, j, i, err, interleave = 0, port_off;
1344  RTSPStream *rtsp_st;
1345  RTSPMessageHeader reply1, *reply = &reply1;
1346  char cmd[2048];
1347  const char *trans_pref;
1348 
1349  if (rt->transport == RTSP_TRANSPORT_RDT)
1350  trans_pref = "x-pn-tng";
1351  else if (rt->transport == RTSP_TRANSPORT_RAW)
1352  trans_pref = "RAW/RAW";
1353  else
1354  trans_pref = "RTP/AVP";
1355 
1356  /* default timeout: 1 minute */
1357  rt->timeout = 60;
1358 
1359  /* Choose a random starting offset within the first half of the
1360  * port range, to allow for a number of ports to try even if the offset
1361  * happens to be at the end of the random range. */
1362  port_off = av_get_random_seed() % ((rt->rtp_port_max - rt->rtp_port_min)/2);
1363  /* even random offset */
1364  port_off -= port_off & 0x01;
1365 
1366  for (j = rt->rtp_port_min + port_off, i = 0; i < rt->nb_rtsp_streams; ++i) {
1367  char transport[2048];
1368 
1369  /*
1370  * WMS serves all UDP data over a single connection, the RTX, which
1371  * isn't necessarily the first in the SDP but has to be the first
1372  * to be set up, else the second/third SETUP will fail with a 461.
1373  */
1374  if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1375  rt->server_type == RTSP_SERVER_WMS) {
1376  if (i == 0) {
1377  /* rtx first */
1378  for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1379  int len = strlen(rt->rtsp_streams[rtx]->control_url);
1380  if (len >= 4 &&
1381  !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1382  "/rtx"))
1383  break;
1384  }
1385  if (rtx == rt->nb_rtsp_streams)
1386  return -1; /* no RTX found */
1387  rtsp_st = rt->rtsp_streams[rtx];
1388  } else
1389  rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1390  } else
1391  rtsp_st = rt->rtsp_streams[i];
1392 
1393  /* RTP/UDP */
1394  if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1395  char buf[256];
1396 
1397  if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1398  port = reply->transports[0].client_port_min;
1399  goto have_port;
1400  }
1401 
1402  /* first try in specified port range */
1403  while (j <= rt->rtp_port_max) {
1404  ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1405  "?localport=%d", j);
1406  /* we will use two ports per rtp stream (rtp and rtcp) */
1407  j += 2;
1408  if (!ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
1409  &s->interrupt_callback, NULL))
1410  goto rtp_opened;
1411  }
1412  av_log(s, AV_LOG_ERROR, "Unable to open an input RTP port\n");
1413  err = AVERROR(EIO);
1414  goto fail;
1415 
1416  rtp_opened:
1417  port = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
1418  have_port:
1419  snprintf(transport, sizeof(transport) - 1,
1420  "%s/UDP;", trans_pref);
1421  if (rt->server_type != RTSP_SERVER_REAL)
1422  av_strlcat(transport, "unicast;", sizeof(transport));
1423  av_strlcatf(transport, sizeof(transport),
1424  "client_port=%d", port);
1425  if (rt->transport == RTSP_TRANSPORT_RTP &&
1426  !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1427  av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1428  }
1429 
1430  /* RTP/TCP */
1431  else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1432  /* For WMS streams, the application streams are only used for
1433  * UDP. When trying to set it up for TCP streams, the server
1434  * will return an error. Therefore, we skip those streams. */
1435  if (rt->server_type == RTSP_SERVER_WMS &&
1436  (rtsp_st->stream_index < 0 ||
1437  s->streams[rtsp_st->stream_index]->codec->codec_type ==
1439  continue;
1440  snprintf(transport, sizeof(transport) - 1,
1441  "%s/TCP;", trans_pref);
1442  if (rt->transport != RTSP_TRANSPORT_RDT)
1443  av_strlcat(transport, "unicast;", sizeof(transport));
1444  av_strlcatf(transport, sizeof(transport),
1445  "interleaved=%d-%d",
1446  interleave, interleave + 1);
1447  interleave += 2;
1448  }
1449 
1450  else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1451  snprintf(transport, sizeof(transport) - 1,
1452  "%s/UDP;multicast", trans_pref);
1453  }
1454  if (s->oformat) {
1455  av_strlcat(transport, ";mode=record", sizeof(transport));
1456  } else if (rt->server_type == RTSP_SERVER_REAL ||
1458  av_strlcat(transport, ";mode=play", sizeof(transport));
1459  snprintf(cmd, sizeof(cmd),
1460  "Transport: %s\r\n",
1461  transport);
1462  if (rt->accept_dynamic_rate)
1463  av_strlcat(cmd, "x-Dynamic-Rate: 0\r\n", sizeof(cmd));
1464  if (i == 0 && rt->server_type == RTSP_SERVER_REAL && CONFIG_RTPDEC) {
1465  char real_res[41], real_csum[9];
1466  ff_rdt_calc_response_and_checksum(real_res, real_csum,
1467  real_challenge);
1468  av_strlcatf(cmd, sizeof(cmd),
1469  "If-Match: %s\r\n"
1470  "RealChallenge2: %s, sd=%s\r\n",
1471  rt->session_id, real_res, real_csum);
1472  }
1473  ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1474  if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1475  err = 1;
1476  goto fail;
1477  } else if (reply->status_code != RTSP_STATUS_OK ||
1478  reply->nb_transports != 1) {
1479  err = AVERROR_INVALIDDATA;
1480  goto fail;
1481  }
1482 
1483  /* XXX: same protocol for all streams is required */
1484  if (i > 0) {
1485  if (reply->transports[0].lower_transport != rt->lower_transport ||
1486  reply->transports[0].transport != rt->transport) {
1487  err = AVERROR_INVALIDDATA;
1488  goto fail;
1489  }
1490  } else {
1491  rt->lower_transport = reply->transports[0].lower_transport;
1492  rt->transport = reply->transports[0].transport;
1493  }
1494 
1495  /* Fail if the server responded with another lower transport mode
1496  * than what we requested. */
1497  if (reply->transports[0].lower_transport != lower_transport) {
1498  av_log(s, AV_LOG_ERROR, "Nonmatching transport in server reply\n");
1499  err = AVERROR_INVALIDDATA;
1500  goto fail;
1501  }
1502 
1503  switch(reply->transports[0].lower_transport) {
1505  rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1506  rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1507  break;
1508 
1509  case RTSP_LOWER_TRANSPORT_UDP: {
1510  char url[1024], options[30] = "";
1511  const char *peer = host;
1512 
1513  if (rt->rtsp_flags & RTSP_FLAG_FILTER_SRC)
1514  av_strlcpy(options, "?connect=1", sizeof(options));
1515  /* Use source address if specified */
1516  if (reply->transports[0].source[0])
1517  peer = reply->transports[0].source;
1518  ff_url_join(url, sizeof(url), "rtp", NULL, peer,
1519  reply->transports[0].server_port_min, "%s", options);
1520  if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1521  ff_rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1522  err = AVERROR_INVALIDDATA;
1523  goto fail;
1524  }
1525  /* Try to initialize the connection state in a
1526  * potential NAT router by sending dummy packets.
1527  * RTP/RTCP dummy packets are used for RDT, too.
1528  */
1529  if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat &&
1530  CONFIG_RTPDEC)
1532  break;
1533  }
1535  char url[1024], namebuf[50], optbuf[20] = "";
1536  struct sockaddr_storage addr;
1537  int port, ttl;
1538 
1539  if (reply->transports[0].destination.ss_family) {
1540  addr = reply->transports[0].destination;
1541  port = reply->transports[0].port_min;
1542  ttl = reply->transports[0].ttl;
1543  } else {
1544  addr = rtsp_st->sdp_ip;
1545  port = rtsp_st->sdp_port;
1546  ttl = rtsp_st->sdp_ttl;
1547  }
1548  if (ttl > 0)
1549  snprintf(optbuf, sizeof(optbuf), "?ttl=%d", ttl);
1550  getnameinfo((struct sockaddr*) &addr, sizeof(addr),
1551  namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
1552  ff_url_join(url, sizeof(url), "rtp", NULL, namebuf,
1553  port, "%s", optbuf);
1554  if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
1555  &s->interrupt_callback, NULL) < 0) {
1556  err = AVERROR_INVALIDDATA;
1557  goto fail;
1558  }
1559  break;
1560  }
1561  }
1562 
1563  if ((err = ff_rtsp_open_transport_ctx(s, rtsp_st)))
1564  goto fail;
1565  }
1566 
1567  if (rt->nb_rtsp_streams && reply->timeout > 0)
1568  rt->timeout = reply->timeout;
1569 
1570  if (rt->server_type == RTSP_SERVER_REAL)
1571  rt->need_subscription = 1;
1572 
1573  return 0;
1574 
1575 fail:
1576  ff_rtsp_undo_setup(s, 0);
1577  return err;
1578 }
1579 
1581 {
1582  RTSPState *rt = s->priv_data;
1583  if (rt->rtsp_hd_out != rt->rtsp_hd) ffurl_close(rt->rtsp_hd_out);
1584  ffurl_close(rt->rtsp_hd);
1585  rt->rtsp_hd = rt->rtsp_hd_out = NULL;
1586 }
1587 
1589 {
1590  RTSPState *rt = s->priv_data;
1591  char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1592  int port, err, tcp_fd;
1593  RTSPMessageHeader reply1 = {0}, *reply = &reply1;
1594  int lower_transport_mask = 0;
1595  char real_challenge[64] = "";
1596  struct sockaddr_storage peer;
1597  socklen_t peer_len = sizeof(peer);
1598 
1599  if (rt->rtp_port_max < rt->rtp_port_min) {
1600  av_log(s, AV_LOG_ERROR, "Invalid UDP port range, max port %d less "
1601  "than min port %d\n", rt->rtp_port_max,
1602  rt->rtp_port_min);
1603  return AVERROR(EINVAL);
1604  }
1605 
1606  if (!ff_network_init())
1607  return AVERROR(EIO);
1608 
1609  if (s->max_delay < 0) /* Not set by the caller */
1611 
1616  }
1617  /* Only pass through valid flags from here */
1619 
1620 redirect:
1621  lower_transport_mask = rt->lower_transport_mask;
1622  /* extract hostname and port */
1623  av_url_split(NULL, 0, auth, sizeof(auth),
1624  host, sizeof(host), &port, path, sizeof(path), s->filename);
1625  if (*auth) {
1626  av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1627  }
1628  if (port < 0)
1629  port = RTSP_DEFAULT_PORT;
1630 
1631  if (!lower_transport_mask)
1632  lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1633 
1634  if (s->oformat) {
1635  /* Only UDP or TCP - UDP multicast isn't supported. */
1636  lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1637  (1 << RTSP_LOWER_TRANSPORT_TCP);
1638  if (!lower_transport_mask || rt->control_transport == RTSP_MODE_TUNNEL) {
1639  av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1640  "only UDP and TCP are supported for output.\n");
1641  err = AVERROR(EINVAL);
1642  goto fail;
1643  }
1644  }
1645 
1646  /* Construct the URI used in request; this is similar to s->filename,
1647  * but with authentication credentials removed and RTSP specific options
1648  * stripped out. */
1649  ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1650  host, port, "%s", path);
1651 
1652  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1653  /* set up initial handshake for tunneling */
1654  char httpname[1024];
1655  char sessioncookie[17];
1656  char headers[1024];
1657 
1658  ff_url_join(httpname, sizeof(httpname), "http", auth, host, port, "%s", path);
1659  snprintf(sessioncookie, sizeof(sessioncookie), "%08x%08x",
1661 
1662  /* GET requests */
1663  if (ffurl_alloc(&rt->rtsp_hd, httpname, AVIO_FLAG_READ,
1664  &s->interrupt_callback) < 0) {
1665  err = AVERROR(EIO);
1666  goto fail;
1667  }
1668 
1669  /* generate GET headers */
1670  snprintf(headers, sizeof(headers),
1671  "x-sessioncookie: %s\r\n"
1672  "Accept: application/x-rtsp-tunnelled\r\n"
1673  "Pragma: no-cache\r\n"
1674  "Cache-Control: no-cache\r\n",
1675  sessioncookie);
1676  av_opt_set(rt->rtsp_hd->priv_data, "headers", headers, 0);
1677 
1678  /* complete the connection */
1679  if (ffurl_connect(rt->rtsp_hd, NULL)) {
1680  err = AVERROR(EIO);
1681  goto fail;
1682  }
1683 
1684  /* POST requests */
1685  if (ffurl_alloc(&rt->rtsp_hd_out, httpname, AVIO_FLAG_WRITE,
1686  &s->interrupt_callback) < 0 ) {
1687  err = AVERROR(EIO);
1688  goto fail;
1689  }
1690 
1691  /* generate POST headers */
1692  snprintf(headers, sizeof(headers),
1693  "x-sessioncookie: %s\r\n"
1694  "Content-Type: application/x-rtsp-tunnelled\r\n"
1695  "Pragma: no-cache\r\n"
1696  "Cache-Control: no-cache\r\n"
1697  "Content-Length: 32767\r\n"
1698  "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
1699  sessioncookie);
1700  av_opt_set(rt->rtsp_hd_out->priv_data, "headers", headers, 0);
1701  av_opt_set(rt->rtsp_hd_out->priv_data, "chunked_post", "0", 0);
1702 
1703  /* Initialize the authentication state for the POST session. The HTTP
1704  * protocol implementation doesn't properly handle multi-pass
1705  * authentication for POST requests, since it would require one of
1706  * the following:
1707  * - implementing Expect: 100-continue, which many HTTP servers
1708  * don't support anyway, even less the RTSP servers that do HTTP
1709  * tunneling
1710  * - sending the whole POST data until getting a 401 reply specifying
1711  * what authentication method to use, then resending all that data
1712  * - waiting for potential 401 replies directly after sending the
1713  * POST header (waiting for some unspecified time)
1714  * Therefore, we copy the full auth state, which works for both basic
1715  * and digest. (For digest, we would have to synchronize the nonce
1716  * count variable between the two sessions, if we'd do more requests
1717  * with the original session, though.)
1718  */
1720 
1721  /* complete the connection */
1722  if (ffurl_connect(rt->rtsp_hd_out, NULL)) {
1723  err = AVERROR(EIO);
1724  goto fail;
1725  }
1726  } else {
1727  /* open the tcp connection */
1728  ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port,
1729  "?timeout=%d", rt->stimeout);
1730  if (ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
1731  &s->interrupt_callback, NULL) < 0) {
1732  err = AVERROR(EIO);
1733  goto fail;
1734  }
1735  rt->rtsp_hd_out = rt->rtsp_hd;
1736  }
1737  rt->seq = 0;
1738 
1739  tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
1740  if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1741  getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1742  NULL, 0, NI_NUMERICHOST);
1743  }
1744 
1745  /* request options supported by the server; this also detects server
1746  * type */
1747  for (rt->server_type = RTSP_SERVER_RTP;;) {
1748  cmd[0] = 0;
1749  if (rt->server_type == RTSP_SERVER_REAL)
1750  av_strlcat(cmd,
1751  /*
1752  * The following entries are required for proper
1753  * streaming from a Realmedia server. They are
1754  * interdependent in some way although we currently
1755  * don't quite understand how. Values were copied
1756  * from mplayer SVN r23589.
1757  * ClientChallenge is a 16-byte ID in hex
1758  * CompanyID is a 16-byte ID in base64
1759  */
1760  "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1761  "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1762  "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1763  "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1764  sizeof(cmd));
1765  ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1766  if (reply->status_code != RTSP_STATUS_OK) {
1767  err = AVERROR_INVALIDDATA;
1768  goto fail;
1769  }
1770 
1771  /* detect server type if not standard-compliant RTP */
1772  if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1774  continue;
1775  } else if (!av_strncasecmp(reply->server, "WMServer/", 9)) {
1777  } else if (rt->server_type == RTSP_SERVER_REAL)
1778  strcpy(real_challenge, reply->real_challenge);
1779  break;
1780  }
1781 
1782  if (s->iformat && CONFIG_RTSP_DEMUXER)
1783  err = ff_rtsp_setup_input_streams(s, reply);
1784  else if (CONFIG_RTSP_MUXER)
1785  err = ff_rtsp_setup_output_streams(s, host);
1786  if (err)
1787  goto fail;
1788 
1789  do {
1790  int lower_transport = ff_log2_tab[lower_transport_mask &
1791  ~(lower_transport_mask - 1)];
1792 
1793  if ((lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP))
1794  && (rt->rtsp_flags & RTSP_FLAG_PREFER_TCP))
1795  lower_transport = RTSP_LOWER_TRANSPORT_TCP;
1796 
1797  err = ff_rtsp_make_setup_request(s, host, port, lower_transport,
1798  rt->server_type == RTSP_SERVER_REAL ?
1799  real_challenge : NULL);
1800  if (err < 0)
1801  goto fail;
1802  lower_transport_mask &= ~(1 << lower_transport);
1803  if (lower_transport_mask == 0 && err == 1) {
1804  err = AVERROR(EPROTONOSUPPORT);
1805  goto fail;
1806  }
1807  } while (err);
1808 
1809  rt->lower_transport_mask = lower_transport_mask;
1810  av_strlcpy(rt->real_challenge, real_challenge, sizeof(rt->real_challenge));
1811  rt->state = RTSP_STATE_IDLE;
1812  rt->seek_timestamp = 0; /* default is to start stream at position zero */
1813  return 0;
1814  fail:
1817  if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1818  av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1819  av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1820  reply->status_code,
1821  s->filename);
1822  goto redirect;
1823  }
1824  ff_network_close();
1825  return err;
1826 }
1827 #endif /* CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER */
1828 
1829 #if CONFIG_RTPDEC
1830 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1831  uint8_t *buf, int buf_size, int64_t wait_end)
1832 {
1833  RTSPState *rt = s->priv_data;
1834  RTSPStream *rtsp_st;
1835  int n, i, ret, tcp_fd, timeout_cnt = 0;
1836  int max_p = 0;
1837  struct pollfd *p = rt->p;
1838  int *fds = NULL, fdsnum, fdsidx;
1839 
1840  for (;;) {
1842  return AVERROR_EXIT;
1843  if (wait_end && wait_end - av_gettime() < 0)
1844  return AVERROR(EAGAIN);
1845  max_p = 0;
1846  if (rt->rtsp_hd) {
1847  tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
1848  p[max_p].fd = tcp_fd;
1849  p[max_p++].events = POLLIN;
1850  } else {
1851  tcp_fd = -1;
1852  }
1853  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1854  rtsp_st = rt->rtsp_streams[i];
1855  if (rtsp_st->rtp_handle) {
1856  if (ret = ffurl_get_multi_file_handle(rtsp_st->rtp_handle,
1857  &fds, &fdsnum)) {
1858  av_log(s, AV_LOG_ERROR, "Unable to recover rtp ports\n");
1859  return ret;
1860  }
1861  if (fdsnum != 2) {
1862  av_log(s, AV_LOG_ERROR,
1863  "Number of fds %d not supported\n", fdsnum);
1864  return AVERROR_INVALIDDATA;
1865  }
1866  for (fdsidx = 0; fdsidx < fdsnum; fdsidx++) {
1867  p[max_p].fd = fds[fdsidx];
1868  p[max_p++].events = POLLIN;
1869  }
1870  av_free(fds);
1871  }
1872  }
1873  n = poll(p, max_p, POLL_TIMEOUT_MS);
1874  if (n > 0) {
1875  int j = 1 - (tcp_fd == -1);
1876  timeout_cnt = 0;
1877  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1878  rtsp_st = rt->rtsp_streams[i];
1879  if (rtsp_st->rtp_handle) {
1880  if (p[j].revents & POLLIN || p[j+1].revents & POLLIN) {
1881  ret = ffurl_read(rtsp_st->rtp_handle, buf, buf_size);
1882  if (ret > 0) {
1883  *prtsp_st = rtsp_st;
1884  return ret;
1885  }
1886  }
1887  j+=2;
1888  }
1889  }
1890 #if CONFIG_RTSP_DEMUXER
1891  if (tcp_fd != -1 && p[0].revents & POLLIN) {
1892  if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
1893  if (rt->state == RTSP_STATE_STREAMING) {
1895  return AVERROR_EOF;
1896  else
1898  "Unable to answer to TEARDOWN\n");
1899  } else
1900  return 0;
1901  } else {
1902  RTSPMessageHeader reply;
1903  ret = ff_rtsp_read_reply(s, &reply, NULL, 0, NULL);
1904  if (ret < 0)
1905  return ret;
1906  /* XXX: parse message */
1907  if (rt->state != RTSP_STATE_STREAMING)
1908  return 0;
1909  }
1910  }
1911 #endif
1912  } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1913  return AVERROR(ETIMEDOUT);
1914  } else if (n < 0 && errno != EINTR)
1915  return AVERROR(errno);
1916  }
1917 }
1918 
1919 static int pick_stream(AVFormatContext *s, RTSPStream **rtsp_st,
1920  const uint8_t *buf, int len)
1921 {
1922  RTSPState *rt = s->priv_data;
1923  int i;
1924  if (len < 0)
1925  return len;
1926  if (rt->nb_rtsp_streams == 1) {
1927  *rtsp_st = rt->rtsp_streams[0];
1928  return len;
1929  }
1930  if (len >= 8 && rt->transport == RTSP_TRANSPORT_RTP) {
1931  if (RTP_PT_IS_RTCP(rt->recvbuf[1])) {
1932  int no_ssrc = 0;
1933  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1934  RTPDemuxContext *rtpctx = rt->rtsp_streams[i]->transport_priv;
1935  if (!rtpctx)
1936  continue;
1937  if (rtpctx->ssrc == AV_RB32(&buf[4])) {
1938  *rtsp_st = rt->rtsp_streams[i];
1939  return len;
1940  }
1941  if (!rtpctx->ssrc)
1942  no_ssrc = 1;
1943  }
1944  if (no_ssrc) {
1946  "Unable to pick stream for packet - SSRC not known for "
1947  "all streams\n");
1948  return AVERROR(EAGAIN);
1949  }
1950  } else {
1951  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1952  if ((buf[1] & 0x7f) == rt->rtsp_streams[i]->sdp_payload_type) {
1953  *rtsp_st = rt->rtsp_streams[i];
1954  return len;
1955  }
1956  }
1957  }
1958  }
1959  av_log(s, AV_LOG_WARNING, "Unable to pick stream for packet\n");
1960  return AVERROR(EAGAIN);
1961 }
1962 
1964 {
1965  RTSPState *rt = s->priv_data;
1966  int ret, len;
1967  RTSPStream *rtsp_st, *first_queue_st = NULL;
1968  int64_t wait_end = 0;
1969 
1970  if (rt->nb_byes == rt->nb_rtsp_streams)
1971  return AVERROR_EOF;
1972 
1973  /* get next frames from the same RTP packet */
1974  if (rt->cur_transport_priv) {
1975  if (rt->transport == RTSP_TRANSPORT_RDT) {
1976  ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1977  } else if (rt->transport == RTSP_TRANSPORT_RTP) {
1978  ret = ff_rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1979  } else if (rt->ts && CONFIG_RTPDEC) {
1980  ret = avpriv_mpegts_parse_packet(rt->ts, pkt, rt->recvbuf + rt->recvbuf_pos, rt->recvbuf_len - rt->recvbuf_pos);
1981  if (ret >= 0) {
1982  rt->recvbuf_pos += ret;
1983  ret = rt->recvbuf_pos < rt->recvbuf_len;
1984  }
1985  } else
1986  ret = -1;
1987  if (ret == 0) {
1988  rt->cur_transport_priv = NULL;
1989  return 0;
1990  } else if (ret == 1) {
1991  return 0;
1992  } else
1993  rt->cur_transport_priv = NULL;
1994  }
1995 
1996 redo:
1997  if (rt->transport == RTSP_TRANSPORT_RTP) {
1998  int i;
1999  int64_t first_queue_time = 0;
2000  for (i = 0; i < rt->nb_rtsp_streams; i++) {
2001  RTPDemuxContext *rtpctx = rt->rtsp_streams[i]->transport_priv;
2002  int64_t queue_time;
2003  if (!rtpctx)
2004  continue;
2005  queue_time = ff_rtp_queued_packet_time(rtpctx);
2006  if (queue_time && (queue_time - first_queue_time < 0 ||
2007  !first_queue_time)) {
2008  first_queue_time = queue_time;
2009  first_queue_st = rt->rtsp_streams[i];
2010  }
2011  }
2012  if (first_queue_time) {
2013  wait_end = first_queue_time + s->max_delay;
2014  } else {
2015  wait_end = 0;
2016  first_queue_st = NULL;
2017  }
2018  }
2019 
2020  /* read next RTP packet */
2021  if (!rt->recvbuf) {
2023  if (!rt->recvbuf)
2024  return AVERROR(ENOMEM);
2025  }
2026 
2027  switch(rt->lower_transport) {
2028  default:
2029 #if CONFIG_RTSP_DEMUXER
2031  len = ff_rtsp_tcp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE);
2032  break;
2033 #endif
2036  len = udp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE, wait_end);
2037  if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
2038  ff_rtp_check_and_send_back_rr(rtsp_st->transport_priv, rtsp_st->rtp_handle, NULL, len);
2039  break;
2041  if (first_queue_st && rt->transport == RTSP_TRANSPORT_RTP &&
2042  wait_end && wait_end < av_gettime())
2043  len = AVERROR(EAGAIN);
2044  else
2045  len = ffio_read_partial(s->pb, rt->recvbuf, RECVBUF_SIZE);
2046  len = pick_stream(s, &rtsp_st, rt->recvbuf, len);
2047  if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
2048  ff_rtp_check_and_send_back_rr(rtsp_st->transport_priv, NULL, s->pb, len);
2049  break;
2050  }
2051  if (len == AVERROR(EAGAIN) && first_queue_st &&
2052  rt->transport == RTSP_TRANSPORT_RTP) {
2053  rtsp_st = first_queue_st;
2054  ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, NULL, 0);
2055  goto end;
2056  }
2057  if (len < 0)
2058  return len;
2059  if (len == 0)
2060  return AVERROR_EOF;
2061  if (rt->transport == RTSP_TRANSPORT_RDT) {
2062  ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
2063  } else if (rt->transport == RTSP_TRANSPORT_RTP) {
2064  ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
2065  if (rtsp_st->feedback) {
2066  AVIOContext *pb = NULL;
2068  pb = s->pb;
2069  ff_rtp_send_rtcp_feedback(rtsp_st->transport_priv, rtsp_st->rtp_handle, pb);
2070  }
2071  if (ret < 0) {
2072  /* Either bad packet, or a RTCP packet. Check if the
2073  * first_rtcp_ntp_time field was initialized. */
2074  RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
2075  if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
2076  /* first_rtcp_ntp_time has been initialized for this stream,
2077  * copy the same value to all other uninitialized streams,
2078  * in order to map their timestamp origin to the same ntp time
2079  * as this one. */
2080  int i;
2081  AVStream *st = NULL;
2082  if (rtsp_st->stream_index >= 0)
2083  st = s->streams[rtsp_st->stream_index];
2084  for (i = 0; i < rt->nb_rtsp_streams; i++) {
2085  RTPDemuxContext *rtpctx2 = rt->rtsp_streams[i]->transport_priv;
2086  AVStream *st2 = NULL;
2087  if (rt->rtsp_streams[i]->stream_index >= 0)
2088  st2 = s->streams[rt->rtsp_streams[i]->stream_index];
2089  if (rtpctx2 && st && st2 &&
2090  rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
2091  rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
2092  rtpctx2->rtcp_ts_offset = av_rescale_q(
2093  rtpctx->rtcp_ts_offset, st->time_base,
2094  st2->time_base);
2095  }
2096  }
2097  // Make real NTP start time available in AVFormatContext
2098  if (s->start_time_realtime == AV_NOPTS_VALUE) {
2099  s->start_time_realtime = av_rescale (rtpctx->first_rtcp_ntp_time - (NTP_OFFSET << 32), 1000000, 1LL << 32);
2100  if (rtpctx->st) {
2101  s->start_time_realtime -=
2102  av_rescale (rtpctx->rtcp_ts_offset,
2103  (uint64_t) rtpctx->st->time_base.num * 1000000,
2104  rtpctx->st->time_base.den);
2105  }
2106  }
2107  }
2108  if (ret == -RTCP_BYE) {
2109  rt->nb_byes++;
2110 
2111  av_log(s, AV_LOG_DEBUG, "Received BYE for stream %d (%d/%d)\n",
2112  rtsp_st->stream_index, rt->nb_byes, rt->nb_rtsp_streams);
2113 
2114  if (rt->nb_byes == rt->nb_rtsp_streams)
2115  return AVERROR_EOF;
2116  }
2117  }
2118  } else if (rt->ts && CONFIG_RTPDEC) {
2119  ret = avpriv_mpegts_parse_packet(rt->ts, pkt, rt->recvbuf, len);
2120  if (ret >= 0) {
2121  if (ret < len) {
2122  rt->recvbuf_len = len;
2123  rt->recvbuf_pos = ret;
2124  rt->cur_transport_priv = rt->ts;
2125  return 1;
2126  } else {
2127  ret = 0;
2128  }
2129  }
2130  } else {
2131  return AVERROR_INVALIDDATA;
2132  }
2133 end:
2134  if (ret < 0)
2135  goto redo;
2136  if (ret == 1)
2137  /* more packets may follow, so we save the RTP context */
2138  rt->cur_transport_priv = rtsp_st->transport_priv;
2139 
2140  return ret;
2141 }
2142 #endif /* CONFIG_RTPDEC */
2143 
2144 #if CONFIG_SDP_DEMUXER
2145 static int sdp_probe(AVProbeData *p1)
2146 {
2147  const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
2148 
2149  /* we look for a line beginning "c=IN IP" */
2150  while (p < p_end && *p != '\0') {
2151  if (p + sizeof("c=IN IP") - 1 < p_end &&
2152  av_strstart(p, "c=IN IP", NULL))
2153  return AVPROBE_SCORE_EXTENSION;
2154 
2155  while (p < p_end - 1 && *p != '\n') p++;
2156  if (++p >= p_end)
2157  break;
2158  if (*p == '\r')
2159  p++;
2160  }
2161  return 0;
2162 }
2163 
2164 static void append_source_addrs(char *buf, int size, const char *name,
2165  int count, struct RTSPSource **addrs)
2166 {
2167  int i;
2168  if (!count)
2169  return;
2170  av_strlcatf(buf, size, "&%s=%s", name, addrs[0]->addr);
2171  for (i = 1; i < count; i++)
2172  av_strlcatf(buf, size, ",%s", addrs[i]->addr);
2173 }
2174 
2175 static int sdp_read_header(AVFormatContext *s)
2176 {
2177  RTSPState *rt = s->priv_data;
2178  RTSPStream *rtsp_st;
2179  int size, i, err;
2180  char *content;
2181  char url[1024];
2182 
2183  if (!ff_network_init())
2184  return AVERROR(EIO);
2185 
2186  if (s->max_delay < 0) /* Not set by the caller */
2188  if (rt->rtsp_flags & RTSP_FLAG_CUSTOM_IO)
2190 
2191  /* read the whole sdp file */
2192  /* XXX: better loading */
2193  content = av_malloc(SDP_MAX_SIZE);
2194  size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);
2195  if (size <= 0) {
2196  av_free(content);
2197  return AVERROR_INVALIDDATA;
2198  }
2199  content[size] ='\0';
2200 
2201  err = ff_sdp_parse(s, content);
2202  av_free(content);
2203  if (err) goto fail;
2204 
2205  /* open each RTP stream */
2206  for (i = 0; i < rt->nb_rtsp_streams; i++) {
2207  char namebuf[50];
2208  rtsp_st = rt->rtsp_streams[i];
2209 
2210  if (!(rt->rtsp_flags & RTSP_FLAG_CUSTOM_IO)) {
2211  getnameinfo((struct sockaddr*) &rtsp_st->sdp_ip, sizeof(rtsp_st->sdp_ip),
2212  namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
2213  ff_url_join(url, sizeof(url), "rtp", NULL,
2214  namebuf, rtsp_st->sdp_port,
2215  "?localport=%d&ttl=%d&connect=%d&write_to_source=%d",
2216  rtsp_st->sdp_port, rtsp_st->sdp_ttl,
2217  rt->rtsp_flags & RTSP_FLAG_FILTER_SRC ? 1 : 0,
2218  rt->rtsp_flags & RTSP_FLAG_RTCP_TO_SOURCE ? 1 : 0);
2219 
2220  append_source_addrs(url, sizeof(url), "sources",
2221  rtsp_st->nb_include_source_addrs,
2222  rtsp_st->include_source_addrs);
2223  append_source_addrs(url, sizeof(url), "block",
2224  rtsp_st->nb_exclude_source_addrs,
2225  rtsp_st->exclude_source_addrs);
2226  if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
2227  &s->interrupt_callback, NULL) < 0) {
2228  err = AVERROR_INVALIDDATA;
2229  goto fail;
2230  }
2231  }
2232  if ((err = ff_rtsp_open_transport_ctx(s, rtsp_st)))
2233  goto fail;
2234  }
2235  return 0;
2236 fail:
2238  ff_network_close();
2239  return err;
2240 }
2241 
2242 static int sdp_read_close(AVFormatContext *s)
2243 {
2245  ff_network_close();
2246  return 0;
2247 }
2248 
2249 static const AVClass sdp_demuxer_class = {
2250  .class_name = "SDP demuxer",
2251  .item_name = av_default_item_name,
2252  .option = sdp_options,
2253  .version = LIBAVUTIL_VERSION_INT,
2254 };
2255 
2256 AVInputFormat ff_sdp_demuxer = {
2257  .name = "sdp",
2258  .long_name = NULL_IF_CONFIG_SMALL("SDP"),
2259  .priv_data_size = sizeof(RTSPState),
2260  .read_probe = sdp_probe,
2261  .read_header = sdp_read_header,
2263  .read_close = sdp_read_close,
2264  .priv_class = &sdp_demuxer_class,
2265 };
2266 #endif /* CONFIG_SDP_DEMUXER */
2267 
2268 #if CONFIG_RTP_DEMUXER
2269 static int rtp_probe(AVProbeData *p)
2270 {
2271  if (av_strstart(p->filename, "rtp:", NULL))
2272  return AVPROBE_SCORE_MAX;
2273  return 0;
2274 }
2275 
2276 static int rtp_read_header(AVFormatContext *s)
2277 {
2278  uint8_t recvbuf[RTP_MAX_PACKET_LENGTH];
2279  char host[500], sdp[500];
2280  int ret, port;
2281  URLContext* in = NULL;
2282  int payload_type;
2283  AVCodecContext codec = { 0 };
2284  struct sockaddr_storage addr;
2285  AVIOContext pb;
2286  socklen_t addrlen = sizeof(addr);
2287  RTSPState *rt = s->priv_data;
2288 
2289  if (!ff_network_init())
2290  return AVERROR(EIO);
2291 
2292  ret = ffurl_open(&in, s->filename, AVIO_FLAG_READ,
2293  &s->interrupt_callback, NULL);
2294  if (ret)
2295  goto fail;
2296 
2297  while (1) {
2298  ret = ffurl_read(in, recvbuf, sizeof(recvbuf));
2299  if (ret == AVERROR(EAGAIN))
2300  continue;
2301  if (ret < 0)
2302  goto fail;
2303  if (ret < 12) {
2304  av_log(s, AV_LOG_WARNING, "Received too short packet\n");
2305  continue;
2306  }
2307 
2308  if ((recvbuf[0] & 0xc0) != 0x80) {
2309  av_log(s, AV_LOG_WARNING, "Unsupported RTP version packet "
2310  "received\n");
2311  continue;
2312  }
2313 
2314  if (RTP_PT_IS_RTCP(recvbuf[1]))
2315  continue;
2316 
2317  payload_type = recvbuf[1] & 0x7f;
2318  break;
2319  }
2320  getsockname(ffurl_get_file_handle(in), (struct sockaddr*) &addr, &addrlen);
2321  ffurl_close(in);
2322  in = NULL;
2323 
2324  if (ff_rtp_get_codec_info(&codec, payload_type)) {
2325  av_log(s, AV_LOG_ERROR, "Unable to receive RTP payload type %d "
2326  "without an SDP file describing it\n",
2327  payload_type);
2328  goto fail;
2329  }
2330  if (codec.codec_type != AVMEDIA_TYPE_DATA) {
2331  av_log(s, AV_LOG_WARNING, "Guessing on RTP content - if not received "
2332  "properly you need an SDP file "
2333  "describing it\n");
2334  }
2335 
2336  av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port,
2337  NULL, 0, s->filename);
2338 
2339  snprintf(sdp, sizeof(sdp),
2340  "v=0\r\nc=IN IP%d %s\r\nm=%s %d RTP/AVP %d\r\n",
2341  addr.ss_family == AF_INET ? 4 : 6, host,
2342  codec.codec_type == AVMEDIA_TYPE_DATA ? "application" :
2343  codec.codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio",
2344  port, payload_type);
2345  av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
2346 
2347  ffio_init_context(&pb, sdp, strlen(sdp), 0, NULL, NULL, NULL, NULL);
2348  s->pb = &pb;
2349 
2350  /* sdp_read_header initializes this again */
2351  ff_network_close();
2352 
2353  rt->media_type_mask = (1 << (AVMEDIA_TYPE_DATA+1)) - 1;
2354 
2355  ret = sdp_read_header(s);
2356  s->pb = NULL;
2357  return ret;
2358 
2359 fail:
2360  if (in)
2361  ffurl_close(in);
2362  ff_network_close();
2363  return ret;
2364 }
2365 
2366 static const AVClass rtp_demuxer_class = {
2367  .class_name = "RTP demuxer",
2368  .item_name = av_default_item_name,
2369  .option = rtp_options,
2370  .version = LIBAVUTIL_VERSION_INT,
2371 };
2372 
2373 AVInputFormat ff_rtp_demuxer = {
2374  .name = "rtp",
2375  .long_name = NULL_IF_CONFIG_SMALL("RTP input"),
2376  .priv_data_size = sizeof(RTSPState),
2377  .read_probe = rtp_probe,
2378  .read_header = rtp_read_header,
2380  .read_close = sdp_read_close,
2381  .flags = AVFMT_NOFILE,
2382  .priv_class = &rtp_demuxer_class,
2383 };
2384 #endif /* CONFIG_RTP_DEMUXER */