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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_SUBTITLE+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  { "subtitle", "Subtitle", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_SUBTITLE}, 0, 0, DEC, "allowed_media_types" }
76 
77 #define COMMON_OPTS() \
78  { "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 }, \
79  { "buffer_size", "Underlying protocol send/receive buffer size", OFFSET(buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, DEC|ENC } \
80 
81 
83  { "initial_pause", "do not start playing the stream immediately", OFFSET(initial_pause), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
84  FF_RTP_FLAG_OPTS(RTSPState, rtp_muxer_flags),
85  { "rtsp_transport", "set RTSP transport protocols", OFFSET(lower_transport_mask), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, DEC|ENC, "rtsp_transport" }, \
86  { "udp", "UDP", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << RTSP_LOWER_TRANSPORT_UDP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
87  { "tcp", "TCP", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << RTSP_LOWER_TRANSPORT_TCP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
88  { "udp_multicast", "UDP multicast", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << RTSP_LOWER_TRANSPORT_UDP_MULTICAST}, 0, 0, DEC, "rtsp_transport" },
89  { "http", "HTTP tunneling", 0, AV_OPT_TYPE_CONST, {.i64 = (1 << RTSP_LOWER_TRANSPORT_HTTP)}, 0, 0, DEC, "rtsp_transport" },
90  RTSP_FLAG_OPTS("rtsp_flags", "set RTSP flags"),
91  { "listen", "wait for incoming connections", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_LISTEN}, 0, 0, DEC, "rtsp_flags" },
92  { "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" },
93  RTSP_MEDIATYPE_OPTS("allowed_media_types", "set media types to accept from the server"),
94  { "min_port", "set minimum local UDP port", OFFSET(rtp_port_min), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MIN}, 0, 65535, DEC|ENC },
95  { "max_port", "set maximum local UDP port", OFFSET(rtp_port_max), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MAX}, 0, 65535, DEC|ENC },
96  { "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 },
97  { "stimeout", "set timeout (in microseconds) of socket TCP I/O operations", OFFSET(stimeout), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
98  COMMON_OPTS(),
99  { "user-agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT}, 0, 0, DEC },
100  { NULL },
101 };
102 
103 static const AVOption sdp_options[] = {
104  RTSP_FLAG_OPTS("sdp_flags", "SDP flags"),
105  { "custom_io", "use custom I/O", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_CUSTOM_IO}, 0, 0, DEC, "rtsp_flags" },
106  { "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" },
107  RTSP_MEDIATYPE_OPTS("allowed_media_types", "set media types to accept from the server"),
108  COMMON_OPTS(),
109  { NULL },
110 };
111 
112 static const AVOption rtp_options[] = {
113  RTSP_FLAG_OPTS("rtp_flags", "set RTP flags"),
114  COMMON_OPTS(),
115  { NULL },
116 };
117 
118 
120 {
121  AVDictionary *opts = NULL;
122  char buf[256];
123 
124  snprintf(buf, sizeof(buf), "%d", rt->buffer_size);
125  av_dict_set(&opts, "buffer_size", buf, 0);
126 
127  return opts;
128 }
129 
130 static void get_word_until_chars(char *buf, int buf_size,
131  const char *sep, const char **pp)
132 {
133  const char *p;
134  char *q;
135 
136  p = *pp;
137  p += strspn(p, SPACE_CHARS);
138  q = buf;
139  while (!strchr(sep, *p) && *p != '\0') {
140  if ((q - buf) < buf_size - 1)
141  *q++ = *p;
142  p++;
143  }
144  if (buf_size > 0)
145  *q = '\0';
146  *pp = p;
147 }
148 
149 static void get_word_sep(char *buf, int buf_size, const char *sep,
150  const char **pp)
151 {
152  if (**pp == '/') (*pp)++;
153  get_word_until_chars(buf, buf_size, sep, pp);
154 }
155 
156 static void get_word(char *buf, int buf_size, const char **pp)
157 {
158  get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
159 }
160 
161 /** Parse a string p in the form of Range:npt=xx-xx, and determine the start
162  * and end time.
163  * Used for seeking in the rtp stream.
164  */
165 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
166 {
167  char buf[256];
168 
169  p += strspn(p, SPACE_CHARS);
170  if (!av_stristart(p, "npt=", &p))
171  return;
172 
173  *start = AV_NOPTS_VALUE;
174  *end = AV_NOPTS_VALUE;
175 
176  get_word_sep(buf, sizeof(buf), "-", &p);
177  if (av_parse_time(start, buf, 1) < 0)
178  return;
179  if (*p == '-') {
180  p++;
181  get_word_sep(buf, sizeof(buf), "-", &p);
182  if (av_parse_time(end, buf, 1) < 0)
183  av_log(NULL, AV_LOG_DEBUG, "Failed to parse interval end specification '%s'\n", buf);
184  }
185 }
186 
187 static int get_sockaddr(const char *buf, struct sockaddr_storage *sock)
188 {
189  struct addrinfo hints = { 0 }, *ai = NULL;
190  hints.ai_flags = AI_NUMERICHOST;
191  if (getaddrinfo(buf, NULL, &hints, &ai))
192  return -1;
193  memcpy(sock, ai->ai_addr, FFMIN(sizeof(*sock), ai->ai_addrlen));
194  freeaddrinfo(ai);
195  return 0;
196 }
197 
198 #if CONFIG_RTPDEC
199 static void init_rtp_handler(RTPDynamicProtocolHandler *handler,
200  RTSPStream *rtsp_st, AVStream *st)
201 {
202  AVCodecContext *codec = st ? st->codec : NULL;
203  if (!handler)
204  return;
205  if (codec)
206  codec->codec_id = handler->codec_id;
207  rtsp_st->dynamic_handler = handler;
208  if (st)
209  st->need_parsing = handler->need_parsing;
210  if (handler->priv_data_size) {
212  if (!rtsp_st->dynamic_protocol_context)
213  rtsp_st->dynamic_handler = NULL;
214  }
215 }
216 
217 static void finalize_rtp_handler_init(AVFormatContext *s, RTSPStream *rtsp_st,
218  AVStream *st)
219 {
220  if (rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->init) {
221  int ret = rtsp_st->dynamic_handler->init(s, st ? st->index : -1,
222  rtsp_st->dynamic_protocol_context);
223  if (ret < 0) {
224  if (rtsp_st->dynamic_protocol_context) {
225  if (rtsp_st->dynamic_handler->close)
226  rtsp_st->dynamic_handler->close(
227  rtsp_st->dynamic_protocol_context);
229  }
230  rtsp_st->dynamic_protocol_context = NULL;
231  rtsp_st->dynamic_handler = NULL;
232  }
233  }
234 }
235 
236 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
237 static int sdp_parse_rtpmap(AVFormatContext *s,
238  AVStream *st, RTSPStream *rtsp_st,
239  int payload_type, const char *p)
240 {
241  AVCodecContext *codec = st->codec;
242  char buf[256];
243  int i;
244  AVCodec *c;
245  const char *c_name;
246 
247  /* See if we can handle this kind of payload.
248  * The space should normally not be there but some Real streams or
249  * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
250  * have a trailing space. */
251  get_word_sep(buf, sizeof(buf), "/ ", &p);
252  if (payload_type < RTP_PT_PRIVATE) {
253  /* We are in a standard case
254  * (from http://www.iana.org/assignments/rtp-parameters). */
255  codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
256  }
257 
258  if (codec->codec_id == AV_CODEC_ID_NONE) {
259  RTPDynamicProtocolHandler *handler =
261  init_rtp_handler(handler, rtsp_st, st);
262  /* If no dynamic handler was found, check with the list of standard
263  * allocated types, if such a stream for some reason happens to
264  * use a private payload type. This isn't handled in rtpdec.c, since
265  * the format name from the rtpmap line never is passed into rtpdec. */
266  if (!rtsp_st->dynamic_handler)
267  codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
268  }
269 
270  c = avcodec_find_decoder(codec->codec_id);
271  if (c && c->name)
272  c_name = c->name;
273  else
274  c_name = "(null)";
275 
276  get_word_sep(buf, sizeof(buf), "/", &p);
277  i = atoi(buf);
278  switch (codec->codec_type) {
279  case AVMEDIA_TYPE_AUDIO:
280  av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
283  if (i > 0) {
284  codec->sample_rate = i;
285  avpriv_set_pts_info(st, 32, 1, codec->sample_rate);
286  get_word_sep(buf, sizeof(buf), "/", &p);
287  i = atoi(buf);
288  if (i > 0)
289  codec->channels = i;
290  }
291  av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
292  codec->sample_rate);
293  av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
294  codec->channels);
295  break;
296  case AVMEDIA_TYPE_VIDEO:
297  av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
298  if (i > 0)
299  avpriv_set_pts_info(st, 32, 1, i);
300  break;
301  default:
302  break;
303  }
304  finalize_rtp_handler_init(s, rtsp_st, st);
305  return 0;
306 }
307 
308 /* parse the attribute line from the fmtp a line of an sdp response. This
309  * is broken out as a function because it is used in rtp_h264.c, which is
310  * forthcoming. */
311 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
312  char *value, int value_size)
313 {
314  *p += strspn(*p, SPACE_CHARS);
315  if (**p) {
316  get_word_sep(attr, attr_size, "=", p);
317  if (**p == '=')
318  (*p)++;
319  get_word_sep(value, value_size, ";", p);
320  if (**p == ';')
321  (*p)++;
322  return 1;
323  }
324  return 0;
325 }
326 
327 typedef struct SDPParseState {
328  /* SDP only */
329  struct sockaddr_storage default_ip;
330  int default_ttl;
331  int skip_media; ///< set if an unknown m= line occurs
332  int nb_default_include_source_addrs; /**< Number of source-specific multicast include source IP address (from SDP content) */
333  struct RTSPSource **default_include_source_addrs; /**< Source-specific multicast include source IP address (from SDP content) */
334  int nb_default_exclude_source_addrs; /**< Number of source-specific multicast exclude source IP address (from SDP content) */
335  struct RTSPSource **default_exclude_source_addrs; /**< Source-specific multicast exclude source IP address (from SDP content) */
336  int seen_rtpmap;
337  int seen_fmtp;
338  char delayed_fmtp[2048];
339 } SDPParseState;
340 
341 static void copy_default_source_addrs(struct RTSPSource **addrs, int count,
342  struct RTSPSource ***dest, int *dest_count)
343 {
344  RTSPSource *rtsp_src, *rtsp_src2;
345  int i;
346  for (i = 0; i < count; i++) {
347  rtsp_src = addrs[i];
348  rtsp_src2 = av_malloc(sizeof(*rtsp_src2));
349  if (!rtsp_src2)
350  continue;
351  memcpy(rtsp_src2, rtsp_src, sizeof(*rtsp_src));
352  dynarray_add(dest, dest_count, rtsp_src2);
353  }
354 }
355 
356 static void parse_fmtp(AVFormatContext *s, RTSPState *rt,
357  int payload_type, const char *line)
358 {
359  int i;
360 
361  for (i = 0; i < rt->nb_rtsp_streams; i++) {
362  RTSPStream *rtsp_st = rt->rtsp_streams[i];
363  if (rtsp_st->sdp_payload_type == payload_type &&
364  rtsp_st->dynamic_handler &&
365  rtsp_st->dynamic_handler->parse_sdp_a_line) {
366  rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
367  rtsp_st->dynamic_protocol_context, line);
368  }
369  }
370 }
371 
372 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
373  int letter, const char *buf)
374 {
375  RTSPState *rt = s->priv_data;
376  char buf1[64], st_type[64];
377  const char *p;
378  enum AVMediaType codec_type;
379  int payload_type;
380  AVStream *st;
381  RTSPStream *rtsp_st;
382  RTSPSource *rtsp_src;
383  struct sockaddr_storage sdp_ip;
384  int ttl;
385 
386  av_log(s, AV_LOG_TRACE, "sdp: %c='%s'\n", letter, buf);
387 
388  p = buf;
389  if (s1->skip_media && letter != 'm')
390  return;
391  switch (letter) {
392  case 'c':
393  get_word(buf1, sizeof(buf1), &p);
394  if (strcmp(buf1, "IN") != 0)
395  return;
396  get_word(buf1, sizeof(buf1), &p);
397  if (strcmp(buf1, "IP4") && strcmp(buf1, "IP6"))
398  return;
399  get_word_sep(buf1, sizeof(buf1), "/", &p);
400  if (get_sockaddr(buf1, &sdp_ip))
401  return;
402  ttl = 16;
403  if (*p == '/') {
404  p++;
405  get_word_sep(buf1, sizeof(buf1), "/", &p);
406  ttl = atoi(buf1);
407  }
408  if (s->nb_streams == 0) {
409  s1->default_ip = sdp_ip;
410  s1->default_ttl = ttl;
411  } else {
412  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
413  rtsp_st->sdp_ip = sdp_ip;
414  rtsp_st->sdp_ttl = ttl;
415  }
416  break;
417  case 's':
418  av_dict_set(&s->metadata, "title", p, 0);
419  break;
420  case 'i':
421  if (s->nb_streams == 0) {
422  av_dict_set(&s->metadata, "comment", p, 0);
423  break;
424  }
425  break;
426  case 'm':
427  /* new stream */
428  s1->skip_media = 0;
429  s1->seen_fmtp = 0;
430  s1->seen_rtpmap = 0;
431  codec_type = AVMEDIA_TYPE_UNKNOWN;
432  get_word(st_type, sizeof(st_type), &p);
433  if (!strcmp(st_type, "audio")) {
434  codec_type = AVMEDIA_TYPE_AUDIO;
435  } else if (!strcmp(st_type, "video")) {
436  codec_type = AVMEDIA_TYPE_VIDEO;
437  } else if (!strcmp(st_type, "application")) {
438  codec_type = AVMEDIA_TYPE_DATA;
439  } else if (!strcmp(st_type, "text")) {
440  codec_type = AVMEDIA_TYPE_SUBTITLE;
441  }
442  if (codec_type == AVMEDIA_TYPE_UNKNOWN || !(rt->media_type_mask & (1 << codec_type))) {
443  s1->skip_media = 1;
444  return;
445  }
446  rtsp_st = av_mallocz(sizeof(RTSPStream));
447  if (!rtsp_st)
448  return;
449  rtsp_st->stream_index = -1;
450  dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
451 
452  rtsp_st->sdp_ip = s1->default_ip;
453  rtsp_st->sdp_ttl = s1->default_ttl;
454 
455  copy_default_source_addrs(s1->default_include_source_addrs,
456  s1->nb_default_include_source_addrs,
457  &rtsp_st->include_source_addrs,
458  &rtsp_st->nb_include_source_addrs);
459  copy_default_source_addrs(s1->default_exclude_source_addrs,
460  s1->nb_default_exclude_source_addrs,
461  &rtsp_st->exclude_source_addrs,
462  &rtsp_st->nb_exclude_source_addrs);
463 
464  get_word(buf1, sizeof(buf1), &p); /* port */
465  rtsp_st->sdp_port = atoi(buf1);
466 
467  get_word(buf1, sizeof(buf1), &p); /* protocol */
468  if (!strcmp(buf1, "udp"))
470  else if (strstr(buf1, "/AVPF") || strstr(buf1, "/SAVPF"))
471  rtsp_st->feedback = 1;
472 
473  /* XXX: handle list of formats */
474  get_word(buf1, sizeof(buf1), &p); /* format list */
475  rtsp_st->sdp_payload_type = atoi(buf1);
476 
477  if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
478  /* no corresponding stream */
479  if (rt->transport == RTSP_TRANSPORT_RAW) {
480  if (CONFIG_RTPDEC && !rt->ts)
481  rt->ts = avpriv_mpegts_parse_open(s);
482  } else {
484  handler = ff_rtp_handler_find_by_id(
486  init_rtp_handler(handler, rtsp_st, NULL);
487  finalize_rtp_handler_init(s, rtsp_st, NULL);
488  }
489  } else if (rt->server_type == RTSP_SERVER_WMS &&
490  codec_type == AVMEDIA_TYPE_DATA) {
491  /* RTX stream, a stream that carries all the other actual
492  * audio/video streams. Don't expose this to the callers. */
493  } else {
494  st = avformat_new_stream(s, NULL);
495  if (!st)
496  return;
497  st->id = rt->nb_rtsp_streams - 1;
498  rtsp_st->stream_index = st->index;
499  st->codec->codec_type = codec_type;
500  if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
502  /* if standard payload type, we can find the codec right now */
504  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
505  st->codec->sample_rate > 0)
506  avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
507  /* Even static payload types may need a custom depacketizer */
508  handler = ff_rtp_handler_find_by_id(
509  rtsp_st->sdp_payload_type, st->codec->codec_type);
510  init_rtp_handler(handler, rtsp_st, st);
511  finalize_rtp_handler_init(s, rtsp_st, st);
512  }
513  if (rt->default_lang[0])
514  av_dict_set(&st->metadata, "language", rt->default_lang, 0);
515  }
516  /* put a default control url */
517  av_strlcpy(rtsp_st->control_url, rt->control_uri,
518  sizeof(rtsp_st->control_url));
519  break;
520  case 'a':
521  if (av_strstart(p, "control:", &p)) {
522  if (s->nb_streams == 0) {
523  if (!strncmp(p, "rtsp://", 7))
524  av_strlcpy(rt->control_uri, p,
525  sizeof(rt->control_uri));
526  } else {
527  char proto[32];
528  /* get the control url */
529  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
530 
531  /* XXX: may need to add full url resolution */
532  av_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
533  NULL, NULL, 0, p);
534  if (proto[0] == '\0') {
535  /* relative control URL */
536  if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
537  av_strlcat(rtsp_st->control_url, "/",
538  sizeof(rtsp_st->control_url));
539  av_strlcat(rtsp_st->control_url, p,
540  sizeof(rtsp_st->control_url));
541  } else
542  av_strlcpy(rtsp_st->control_url, p,
543  sizeof(rtsp_st->control_url));
544  }
545  } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
546  /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
547  get_word(buf1, sizeof(buf1), &p);
548  payload_type = atoi(buf1);
549  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
550  if (rtsp_st->stream_index >= 0) {
551  st = s->streams[rtsp_st->stream_index];
552  sdp_parse_rtpmap(s, st, rtsp_st, payload_type, p);
553  }
554  s1->seen_rtpmap = 1;
555  if (s1->seen_fmtp) {
556  parse_fmtp(s, rt, payload_type, s1->delayed_fmtp);
557  }
558  } else if (av_strstart(p, "fmtp:", &p) ||
559  av_strstart(p, "framesize:", &p)) {
560  // let dynamic protocol handlers have a stab at the line.
561  get_word(buf1, sizeof(buf1), &p);
562  payload_type = atoi(buf1);
563  if (s1->seen_rtpmap) {
564  parse_fmtp(s, rt, payload_type, buf);
565  } else {
566  s1->seen_fmtp = 1;
567  av_strlcpy(s1->delayed_fmtp, buf, sizeof(s1->delayed_fmtp));
568  }
569  } else if (av_strstart(p, "range:", &p)) {
570  int64_t start, end;
571 
572  // this is so that seeking on a streamed file can work.
573  rtsp_parse_range_npt(p, &start, &end);
574  s->start_time = start;
575  /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
576  s->duration = (end == AV_NOPTS_VALUE) ?
577  AV_NOPTS_VALUE : end - start;
578  } else if (av_strstart(p, "lang:", &p)) {
579  if (s->nb_streams > 0) {
580  get_word(buf1, sizeof(buf1), &p);
581  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
582  if (rtsp_st->stream_index >= 0) {
583  st = s->streams[rtsp_st->stream_index];
584  av_dict_set(&st->metadata, "language", buf1, 0);
585  }
586  } else
587  get_word(rt->default_lang, sizeof(rt->default_lang), &p);
588  } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
589  if (atoi(p) == 1)
591  } else if (av_strstart(p, "SampleRate:integer;", &p) &&
592  s->nb_streams > 0) {
593  st = s->streams[s->nb_streams - 1];
594  st->codec->sample_rate = atoi(p);
595  } else if (av_strstart(p, "crypto:", &p) && s->nb_streams > 0) {
596  // RFC 4568
597  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
598  get_word(buf1, sizeof(buf1), &p); // ignore tag
599  get_word(rtsp_st->crypto_suite, sizeof(rtsp_st->crypto_suite), &p);
600  p += strspn(p, SPACE_CHARS);
601  if (av_strstart(p, "inline:", &p))
602  get_word(rtsp_st->crypto_params, sizeof(rtsp_st->crypto_params), &p);
603  } else if (av_strstart(p, "source-filter:", &p)) {
604  int exclude = 0;
605  get_word(buf1, sizeof(buf1), &p);
606  if (strcmp(buf1, "incl") && strcmp(buf1, "excl"))
607  return;
608  exclude = !strcmp(buf1, "excl");
609 
610  get_word(buf1, sizeof(buf1), &p);
611  if (strcmp(buf1, "IN") != 0)
612  return;
613  get_word(buf1, sizeof(buf1), &p);
614  if (strcmp(buf1, "IP4") && strcmp(buf1, "IP6") && strcmp(buf1, "*"))
615  return;
616  // not checking that the destination address actually matches or is wildcard
617  get_word(buf1, sizeof(buf1), &p);
618 
619  while (*p != '\0') {
620  rtsp_src = av_mallocz(sizeof(*rtsp_src));
621  if (!rtsp_src)
622  return;
623  get_word(rtsp_src->addr, sizeof(rtsp_src->addr), &p);
624  if (exclude) {
625  if (s->nb_streams == 0) {
626  dynarray_add(&s1->default_exclude_source_addrs, &s1->nb_default_exclude_source_addrs, rtsp_src);
627  } else {
628  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
629  dynarray_add(&rtsp_st->exclude_source_addrs, &rtsp_st->nb_exclude_source_addrs, rtsp_src);
630  }
631  } else {
632  if (s->nb_streams == 0) {
633  dynarray_add(&s1->default_include_source_addrs, &s1->nb_default_include_source_addrs, rtsp_src);
634  } else {
635  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
636  dynarray_add(&rtsp_st->include_source_addrs, &rtsp_st->nb_include_source_addrs, rtsp_src);
637  }
638  }
639  }
640  } else {
641  if (rt->server_type == RTSP_SERVER_WMS)
643  if (s->nb_streams > 0) {
644  rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
645 
646  if (rt->server_type == RTSP_SERVER_REAL)
647  ff_real_parse_sdp_a_line(s, rtsp_st->stream_index, p);
648 
649  if (rtsp_st->dynamic_handler &&
651  rtsp_st->dynamic_handler->parse_sdp_a_line(s,
652  rtsp_st->stream_index,
653  rtsp_st->dynamic_protocol_context, buf);
654  }
655  }
656  break;
657  }
658 }
659 
660 int ff_sdp_parse(AVFormatContext *s, const char *content)
661 {
662  RTSPState *rt = s->priv_data;
663  const char *p;
664  int letter, i;
665  /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
666  * contain long SDP lines containing complete ASF Headers (several
667  * kB) or arrays of MDPR (RM stream descriptor) headers plus
668  * "rulebooks" describing their properties. Therefore, the SDP line
669  * buffer is large.
670  *
671  * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
672  * in rtpdec_xiph.c. */
673  char buf[16384], *q;
674  SDPParseState sdp_parse_state = { { 0 } }, *s1 = &sdp_parse_state;
675 
676  p = content;
677  for (;;) {
678  p += strspn(p, SPACE_CHARS);
679  letter = *p;
680  if (letter == '\0')
681  break;
682  p++;
683  if (*p != '=')
684  goto next_line;
685  p++;
686  /* get the content */
687  q = buf;
688  while (*p != '\n' && *p != '\r' && *p != '\0') {
689  if ((q - buf) < sizeof(buf) - 1)
690  *q++ = *p;
691  p++;
692  }
693  *q = '\0';
694  sdp_parse_line(s, s1, letter, buf);
695  next_line:
696  while (*p != '\n' && *p != '\0')
697  p++;
698  if (*p == '\n')
699  p++;
700  }
701 
702  for (i = 0; i < s1->nb_default_include_source_addrs; i++)
703  av_freep(&s1->default_include_source_addrs[i]);
704  av_freep(&s1->default_include_source_addrs);
705  for (i = 0; i < s1->nb_default_exclude_source_addrs; i++)
706  av_freep(&s1->default_exclude_source_addrs[i]);
707  av_freep(&s1->default_exclude_source_addrs);
708 
709  rt->p = av_malloc_array(rt->nb_rtsp_streams + 1, sizeof(struct pollfd) * 2);
710  if (!rt->p) return AVERROR(ENOMEM);
711  return 0;
712 }
713 #endif /* CONFIG_RTPDEC */
714 
715 void ff_rtsp_undo_setup(AVFormatContext *s, int send_packets)
716 {
717  RTSPState *rt = s->priv_data;
718  int i;
719 
720  for (i = 0; i < rt->nb_rtsp_streams; i++) {
721  RTSPStream *rtsp_st = rt->rtsp_streams[i];
722  if (!rtsp_st)
723  continue;
724  if (rtsp_st->transport_priv) {
725  if (s->oformat) {
726  AVFormatContext *rtpctx = rtsp_st->transport_priv;
727  av_write_trailer(rtpctx);
729  if (CONFIG_RTSP_MUXER && rtpctx->pb && send_packets)
730  ff_rtsp_tcp_write_packet(s, rtsp_st);
731  ffio_free_dyn_buf(&rtpctx->pb);
732  } else {
733  avio_closep(&rtpctx->pb);
734  }
735  avformat_free_context(rtpctx);
736  } else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RDT)
738  else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RTP)
740  }
741  rtsp_st->transport_priv = NULL;
742  if (rtsp_st->rtp_handle)
743  ffurl_close(rtsp_st->rtp_handle);
744  rtsp_st->rtp_handle = NULL;
745  }
746 }
747 
748 /* close and free RTSP streams */
750 {
751  RTSPState *rt = s->priv_data;
752  int i, j;
753  RTSPStream *rtsp_st;
754 
755  ff_rtsp_undo_setup(s, 0);
756  for (i = 0; i < rt->nb_rtsp_streams; i++) {
757  rtsp_st = rt->rtsp_streams[i];
758  if (rtsp_st) {
759  if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context) {
760  if (rtsp_st->dynamic_handler->close)
761  rtsp_st->dynamic_handler->close(
762  rtsp_st->dynamic_protocol_context);
764  }
765  for (j = 0; j < rtsp_st->nb_include_source_addrs; j++)
766  av_freep(&rtsp_st->include_source_addrs[j]);
767  av_freep(&rtsp_st->include_source_addrs);
768  for (j = 0; j < rtsp_st->nb_exclude_source_addrs; j++)
769  av_freep(&rtsp_st->exclude_source_addrs[j]);
770  av_freep(&rtsp_st->exclude_source_addrs);
771 
772  av_freep(&rtsp_st);
773  }
774  }
775  av_freep(&rt->rtsp_streams);
776  if (rt->asf_ctx) {
778  }
779  if (CONFIG_RTPDEC && rt->ts)
781  av_freep(&rt->p);
782  av_freep(&rt->recvbuf);
783 }
784 
786 {
787  RTSPState *rt = s->priv_data;
788  AVStream *st = NULL;
789  int reordering_queue_size = rt->reordering_queue_size;
790  if (reordering_queue_size < 0) {
792  reordering_queue_size = 0;
793  else
794  reordering_queue_size = RTP_REORDER_QUEUE_DEFAULT_SIZE;
795  }
796 
797  /* open the RTP context */
798  if (rtsp_st->stream_index >= 0)
799  st = s->streams[rtsp_st->stream_index];
800  if (!st)
802 
803  if (CONFIG_RTSP_MUXER && s->oformat && st) {
804  int ret = ff_rtp_chain_mux_open((AVFormatContext **)&rtsp_st->transport_priv,
805  s, st, rtsp_st->rtp_handle,
807  rtsp_st->stream_index);
808  /* Ownership of rtp_handle is passed to the rtp mux context */
809  rtsp_st->rtp_handle = NULL;
810  if (ret < 0)
811  return ret;
812  st->time_base = ((AVFormatContext*)rtsp_st->transport_priv)->streams[0]->time_base;
813  } else if (rt->transport == RTSP_TRANSPORT_RAW) {
814  return 0; // Don't need to open any parser here
815  } else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RDT && st)
816  rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
817  rtsp_st->dynamic_protocol_context,
818  rtsp_st->dynamic_handler);
819  else if (CONFIG_RTPDEC)
820  rtsp_st->transport_priv = ff_rtp_parse_open(s, st,
821  rtsp_st->sdp_payload_type,
822  reordering_queue_size);
823 
824  if (!rtsp_st->transport_priv) {
825  return AVERROR(ENOMEM);
826  } else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RTP) {
827  if (rtsp_st->dynamic_handler) {
829  rtsp_st->dynamic_protocol_context,
830  rtsp_st->dynamic_handler);
831  }
832  if (rtsp_st->crypto_suite[0])
834  rtsp_st->crypto_suite,
835  rtsp_st->crypto_params);
836  }
837 
838  return 0;
839 }
840 
841 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
842 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
843 {
844  const char *q;
845  char *p;
846  int v;
847 
848  q = *pp;
849  q += strspn(q, SPACE_CHARS);
850  v = strtol(q, &p, 10);
851  if (*p == '-') {
852  p++;
853  *min_ptr = v;
854  v = strtol(p, &p, 10);
855  *max_ptr = v;
856  } else {
857  *min_ptr = v;
858  *max_ptr = v;
859  }
860  *pp = p;
861 }
862 
863 /* XXX: only one transport specification is parsed */
864 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
865 {
866  char transport_protocol[16];
867  char profile[16];
868  char lower_transport[16];
869  char parameter[16];
871  char buf[256];
872 
873  reply->nb_transports = 0;
874 
875  for (;;) {
876  p += strspn(p, SPACE_CHARS);
877  if (*p == '\0')
878  break;
879 
880  th = &reply->transports[reply->nb_transports];
881 
882  get_word_sep(transport_protocol, sizeof(transport_protocol),
883  "/", &p);
884  if (!av_strcasecmp (transport_protocol, "rtp")) {
885  get_word_sep(profile, sizeof(profile), "/;,", &p);
886  lower_transport[0] = '\0';
887  /* rtp/avp/<protocol> */
888  if (*p == '/') {
889  get_word_sep(lower_transport, sizeof(lower_transport),
890  ";,", &p);
891  }
893  } else if (!av_strcasecmp (transport_protocol, "x-pn-tng") ||
894  !av_strcasecmp (transport_protocol, "x-real-rdt")) {
895  /* x-pn-tng/<protocol> */
896  get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
897  profile[0] = '\0';
899  } else if (!av_strcasecmp(transport_protocol, "raw")) {
900  get_word_sep(profile, sizeof(profile), "/;,", &p);
901  lower_transport[0] = '\0';
902  /* raw/raw/<protocol> */
903  if (*p == '/') {
904  get_word_sep(lower_transport, sizeof(lower_transport),
905  ";,", &p);
906  }
908  }
909  if (!av_strcasecmp(lower_transport, "TCP"))
911  else
913 
914  if (*p == ';')
915  p++;
916  /* get each parameter */
917  while (*p != '\0' && *p != ',') {
918  get_word_sep(parameter, sizeof(parameter), "=;,", &p);
919  if (!strcmp(parameter, "port")) {
920  if (*p == '=') {
921  p++;
922  rtsp_parse_range(&th->port_min, &th->port_max, &p);
923  }
924  } else if (!strcmp(parameter, "client_port")) {
925  if (*p == '=') {
926  p++;
927  rtsp_parse_range(&th->client_port_min,
928  &th->client_port_max, &p);
929  }
930  } else if (!strcmp(parameter, "server_port")) {
931  if (*p == '=') {
932  p++;
933  rtsp_parse_range(&th->server_port_min,
934  &th->server_port_max, &p);
935  }
936  } else if (!strcmp(parameter, "interleaved")) {
937  if (*p == '=') {
938  p++;
939  rtsp_parse_range(&th->interleaved_min,
940  &th->interleaved_max, &p);
941  }
942  } else if (!strcmp(parameter, "multicast")) {
945  } else if (!strcmp(parameter, "ttl")) {
946  if (*p == '=') {
947  char *end;
948  p++;
949  th->ttl = strtol(p, &end, 10);
950  p = end;
951  }
952  } else if (!strcmp(parameter, "destination")) {
953  if (*p == '=') {
954  p++;
955  get_word_sep(buf, sizeof(buf), ";,", &p);
956  get_sockaddr(buf, &th->destination);
957  }
958  } else if (!strcmp(parameter, "source")) {
959  if (*p == '=') {
960  p++;
961  get_word_sep(buf, sizeof(buf), ";,", &p);
962  av_strlcpy(th->source, buf, sizeof(th->source));
963  }
964  } else if (!strcmp(parameter, "mode")) {
965  if (*p == '=') {
966  p++;
967  get_word_sep(buf, sizeof(buf), ";, ", &p);
968  if (!strcmp(buf, "record") ||
969  !strcmp(buf, "receive"))
970  th->mode_record = 1;
971  }
972  }
973 
974  while (*p != ';' && *p != '\0' && *p != ',')
975  p++;
976  if (*p == ';')
977  p++;
978  }
979  if (*p == ',')
980  p++;
981 
982  reply->nb_transports++;
983  if (reply->nb_transports >= RTSP_MAX_TRANSPORTS)
984  break;
985  }
986 }
987 
988 static void handle_rtp_info(RTSPState *rt, const char *url,
989  uint32_t seq, uint32_t rtptime)
990 {
991  int i;
992  if (!rtptime || !url[0])
993  return;
994  if (rt->transport != RTSP_TRANSPORT_RTP)
995  return;
996  for (i = 0; i < rt->nb_rtsp_streams; i++) {
997  RTSPStream *rtsp_st = rt->rtsp_streams[i];
998  RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
999  if (!rtpctx)
1000  continue;
1001  if (!strcmp(rtsp_st->control_url, url)) {
1002  rtpctx->base_timestamp = rtptime;
1003  break;
1004  }
1005  }
1006 }
1007 
1008 static void rtsp_parse_rtp_info(RTSPState *rt, const char *p)
1009 {
1010  int read = 0;
1011  char key[20], value[1024], url[1024] = "";
1012  uint32_t seq = 0, rtptime = 0;
1013 
1014  for (;;) {
1015  p += strspn(p, SPACE_CHARS);
1016  if (!*p)
1017  break;
1018  get_word_sep(key, sizeof(key), "=", &p);
1019  if (*p != '=')
1020  break;
1021  p++;
1022  get_word_sep(value, sizeof(value), ";, ", &p);
1023  read++;
1024  if (!strcmp(key, "url"))
1025  av_strlcpy(url, value, sizeof(url));
1026  else if (!strcmp(key, "seq"))
1027  seq = strtoul(value, NULL, 10);
1028  else if (!strcmp(key, "rtptime"))
1029  rtptime = strtoul(value, NULL, 10);
1030  if (*p == ',') {
1031  handle_rtp_info(rt, url, seq, rtptime);
1032  url[0] = '\0';
1033  seq = rtptime = 0;
1034  read = 0;
1035  }
1036  if (*p)
1037  p++;
1038  }
1039  if (read > 0)
1040  handle_rtp_info(rt, url, seq, rtptime);
1041 }
1042 
1043 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
1044  RTSPState *rt, const char *method)
1045 {
1046  const char *p;
1047 
1048  /* NOTE: we do case independent match for broken servers */
1049  p = buf;
1050  if (av_stristart(p, "Session:", &p)) {
1051  int t;
1052  get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
1053  if (av_stristart(p, ";timeout=", &p) &&
1054  (t = strtol(p, NULL, 10)) > 0) {
1055  reply->timeout = t;
1056  }
1057  } else if (av_stristart(p, "Content-Length:", &p)) {
1058  reply->content_length = strtol(p, NULL, 10);
1059  } else if (av_stristart(p, "Transport:", &p)) {
1060  rtsp_parse_transport(reply, p);
1061  } else if (av_stristart(p, "CSeq:", &p)) {
1062  reply->seq = strtol(p, NULL, 10);
1063  } else if (av_stristart(p, "Range:", &p)) {
1064  rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
1065  } else if (av_stristart(p, "RealChallenge1:", &p)) {
1066  p += strspn(p, SPACE_CHARS);
1067  av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
1068  } else if (av_stristart(p, "Server:", &p)) {
1069  p += strspn(p, SPACE_CHARS);
1070  av_strlcpy(reply->server, p, sizeof(reply->server));
1071  } else if (av_stristart(p, "Notice:", &p) ||
1072  av_stristart(p, "X-Notice:", &p)) {
1073  reply->notice = strtol(p, NULL, 10);
1074  } else if (av_stristart(p, "Location:", &p)) {
1075  p += strspn(p, SPACE_CHARS);
1076  av_strlcpy(reply->location, p , sizeof(reply->location));
1077  } else if (av_stristart(p, "WWW-Authenticate:", &p) && rt) {
1078  p += strspn(p, SPACE_CHARS);
1079  ff_http_auth_handle_header(&rt->auth_state, "WWW-Authenticate", p);
1080  } else if (av_stristart(p, "Authentication-Info:", &p) && rt) {
1081  p += strspn(p, SPACE_CHARS);
1082  ff_http_auth_handle_header(&rt->auth_state, "Authentication-Info", p);
1083  } else if (av_stristart(p, "Content-Base:", &p) && rt) {
1084  p += strspn(p, SPACE_CHARS);
1085  if (method && !strcmp(method, "DESCRIBE"))
1086  av_strlcpy(rt->control_uri, p , sizeof(rt->control_uri));
1087  } else if (av_stristart(p, "RTP-Info:", &p) && rt) {
1088  p += strspn(p, SPACE_CHARS);
1089  if (method && !strcmp(method, "PLAY"))
1090  rtsp_parse_rtp_info(rt, p);
1091  } else if (av_stristart(p, "Public:", &p) && rt) {
1092  if (strstr(p, "GET_PARAMETER") &&
1093  method && !strcmp(method, "OPTIONS"))
1094  rt->get_parameter_supported = 1;
1095  } else if (av_stristart(p, "x-Accept-Dynamic-Rate:", &p) && rt) {
1096  p += strspn(p, SPACE_CHARS);
1097  rt->accept_dynamic_rate = atoi(p);
1098  } else if (av_stristart(p, "Content-Type:", &p)) {
1099  p += strspn(p, SPACE_CHARS);
1100  av_strlcpy(reply->content_type, p, sizeof(reply->content_type));
1101  }
1102 }
1103 
1104 /* skip a RTP/TCP interleaved packet */
1106 {
1107  RTSPState *rt = s->priv_data;
1108  int ret, len, len1;
1109  uint8_t buf[1024];
1110 
1111  ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
1112  if (ret != 3)
1113  return;
1114  len = AV_RB16(buf + 1);
1115 
1116  av_log(s, AV_LOG_TRACE, "skipping RTP packet len=%d\n", len);
1117 
1118  /* skip payload */
1119  while (len > 0) {
1120  len1 = len;
1121  if (len1 > sizeof(buf))
1122  len1 = sizeof(buf);
1123  ret = ffurl_read_complete(rt->rtsp_hd, buf, len1);
1124  if (ret != len1)
1125  return;
1126  len -= len1;
1127  }
1128 }
1129 
1131  unsigned char **content_ptr,
1132  int return_on_interleaved_data, const char *method)
1133 {
1134  RTSPState *rt = s->priv_data;
1135  char buf[4096], buf1[1024], *q;
1136  unsigned char ch;
1137  const char *p;
1138  int ret, content_length, line_count = 0, request = 0;
1139  unsigned char *content = NULL;
1140 
1141 start:
1142  line_count = 0;
1143  request = 0;
1144  content = NULL;
1145  memset(reply, 0, sizeof(*reply));
1146 
1147  /* parse reply (XXX: use buffers) */
1148  rt->last_reply[0] = '\0';
1149  for (;;) {
1150  q = buf;
1151  for (;;) {
1152  ret = ffurl_read_complete(rt->rtsp_hd, &ch, 1);
1153  av_log(s, AV_LOG_TRACE, "ret=%d c=%02x [%c]\n", ret, ch, ch);
1154  if (ret != 1)
1155  return AVERROR_EOF;
1156  if (ch == '\n')
1157  break;
1158  if (ch == '$') {
1159  /* XXX: only parse it if first char on line ? */
1160  if (return_on_interleaved_data) {
1161  return 1;
1162  } else
1164  } else if (ch != '\r') {
1165  if ((q - buf) < sizeof(buf) - 1)
1166  *q++ = ch;
1167  }
1168  }
1169  *q = '\0';
1170 
1171  av_log(s, AV_LOG_TRACE, "line='%s'\n", buf);
1172 
1173  /* test if last line */
1174  if (buf[0] == '\0')
1175  break;
1176  p = buf;
1177  if (line_count == 0) {
1178  /* get reply code */
1179  get_word(buf1, sizeof(buf1), &p);
1180  if (!strncmp(buf1, "RTSP/", 5)) {
1181  get_word(buf1, sizeof(buf1), &p);
1182  reply->status_code = atoi(buf1);
1183  av_strlcpy(reply->reason, p, sizeof(reply->reason));
1184  } else {
1185  av_strlcpy(reply->reason, buf1, sizeof(reply->reason)); // method
1186  get_word(buf1, sizeof(buf1), &p); // object
1187  request = 1;
1188  }
1189  } else {
1190  ff_rtsp_parse_line(reply, p, rt, method);
1191  av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
1192  av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
1193  }
1194  line_count++;
1195  }
1196 
1197  if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0' && !request)
1198  av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
1199 
1200  content_length = reply->content_length;
1201  if (content_length > 0) {
1202  /* leave some room for a trailing '\0' (useful for simple parsing) */
1203  content = av_malloc(content_length + 1);
1204  if (!content)
1205  return AVERROR(ENOMEM);
1206  ffurl_read_complete(rt->rtsp_hd, content, content_length);
1207  content[content_length] = '\0';
1208  }
1209  if (content_ptr)
1210  *content_ptr = content;
1211  else
1212  av_freep(&content);
1213 
1214  if (request) {
1215  char buf[1024];
1216  char base64buf[AV_BASE64_SIZE(sizeof(buf))];
1217  const char* ptr = buf;
1218 
1219  if (!strcmp(reply->reason, "OPTIONS")) {
1220  snprintf(buf, sizeof(buf), "RTSP/1.0 200 OK\r\n");
1221  if (reply->seq)
1222  av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", reply->seq);
1223  if (reply->session_id[0])
1224  av_strlcatf(buf, sizeof(buf), "Session: %s\r\n",
1225  reply->session_id);
1226  } else {
1227  snprintf(buf, sizeof(buf), "RTSP/1.0 501 Not Implemented\r\n");
1228  }
1229  av_strlcat(buf, "\r\n", sizeof(buf));
1230 
1231  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1232  av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
1233  ptr = base64buf;
1234  }
1235  ffurl_write(rt->rtsp_hd_out, ptr, strlen(ptr));
1236 
1238  /* Even if the request from the server had data, it is not the data
1239  * that the caller wants or expects. The memory could also be leaked
1240  * if the actual following reply has content data. */
1241  if (content_ptr)
1242  av_freep(content_ptr);
1243  /* If method is set, this is called from ff_rtsp_send_cmd,
1244  * where a reply to exactly this request is awaited. For
1245  * callers from within packet receiving, we just want to
1246  * return to the caller and go back to receiving packets. */
1247  if (method)
1248  goto start;
1249  return 0;
1250  }
1251 
1252  if (rt->seq != reply->seq) {
1253  av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
1254  rt->seq, reply->seq);
1255  }
1256 
1257  /* EOS */
1258  if (reply->notice == 2101 /* End-of-Stream Reached */ ||
1259  reply->notice == 2104 /* Start-of-Stream Reached */ ||
1260  reply->notice == 2306 /* Continuous Feed Terminated */) {
1261  rt->state = RTSP_STATE_IDLE;
1262  } else if (reply->notice >= 4400 && reply->notice < 5500) {
1263  return AVERROR(EIO); /* data or server error */
1264  } else if (reply->notice == 2401 /* Ticket Expired */ ||
1265  (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
1266  return AVERROR(EPERM);
1267 
1268  return 0;
1269 }
1270 
1271 /**
1272  * Send a command to the RTSP server without waiting for the reply.
1273  *
1274  * @param s RTSP (de)muxer context
1275  * @param method the method for the request
1276  * @param url the target url for the request
1277  * @param headers extra header lines to include in the request
1278  * @param send_content if non-null, the data to send as request body content
1279  * @param send_content_length the length of the send_content data, or 0 if
1280  * send_content is null
1281  *
1282  * @return zero if success, nonzero otherwise
1283  */
1284 static int rtsp_send_cmd_with_content_async(AVFormatContext *s,
1285  const char *method, const char *url,
1286  const char *headers,
1287  const unsigned char *send_content,
1288  int send_content_length)
1289 {
1290  RTSPState *rt = s->priv_data;
1291  char buf[4096], *out_buf;
1292  char base64buf[AV_BASE64_SIZE(sizeof(buf))];
1293 
1294  /* Add in RTSP headers */
1295  out_buf = buf;
1296  rt->seq++;
1297  snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
1298  if (headers)
1299  av_strlcat(buf, headers, sizeof(buf));
1300  av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
1301  av_strlcatf(buf, sizeof(buf), "User-Agent: %s\r\n", rt->user_agent);
1302  if (rt->session_id[0] != '\0' && (!headers ||
1303  !strstr(headers, "\nIf-Match:"))) {
1304  av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
1305  }
1306  if (rt->auth[0]) {
1307  char *str = ff_http_auth_create_response(&rt->auth_state,
1308  rt->auth, url, method);
1309  if (str)
1310  av_strlcat(buf, str, sizeof(buf));
1311  av_free(str);
1312  }
1313  if (send_content_length > 0 && send_content)
1314  av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
1315  av_strlcat(buf, "\r\n", sizeof(buf));
1316 
1317  /* base64 encode rtsp if tunneling */
1318  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1319  av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
1320  out_buf = base64buf;
1321  }
1322 
1323  av_log(s, AV_LOG_TRACE, "Sending:\n%s--\n", buf);
1324 
1325  ffurl_write(rt->rtsp_hd_out, out_buf, strlen(out_buf));
1326  if (send_content_length > 0 && send_content) {
1327  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1328  av_log(s, AV_LOG_ERROR, "tunneling of RTSP requests "
1329  "with content data not supported\n");
1330  return AVERROR_PATCHWELCOME;
1331  }
1332  ffurl_write(rt->rtsp_hd_out, send_content, send_content_length);
1333  }
1335 
1336  return 0;
1337 }
1338 
1339 int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
1340  const char *url, const char *headers)
1341 {
1342  return rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
1343 }
1344 
1345 int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
1346  const char *headers, RTSPMessageHeader *reply,
1347  unsigned char **content_ptr)
1348 {
1349  return ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
1350  content_ptr, NULL, 0);
1351 }
1352 
1354  const char *method, const char *url,
1355  const char *header,
1356  RTSPMessageHeader *reply,
1357  unsigned char **content_ptr,
1358  const unsigned char *send_content,
1359  int send_content_length)
1360 {
1361  RTSPState *rt = s->priv_data;
1362  HTTPAuthType cur_auth_type;
1363  int ret, attempts = 0;
1364 
1365 retry:
1366  cur_auth_type = rt->auth_state.auth_type;
1367  if ((ret = rtsp_send_cmd_with_content_async(s, method, url, header,
1368  send_content,
1369  send_content_length)))
1370  return ret;
1371 
1372  if ((ret = ff_rtsp_read_reply(s, reply, content_ptr, 0, method) ) < 0)
1373  return ret;
1374  attempts++;
1375 
1376  if (reply->status_code == 401 &&
1377  (cur_auth_type == HTTP_AUTH_NONE || rt->auth_state.stale) &&
1378  rt->auth_state.auth_type != HTTP_AUTH_NONE && attempts < 2)
1379  goto retry;
1380 
1381  if (reply->status_code > 400){
1382  av_log(s, AV_LOG_ERROR, "method %s failed: %d%s\n",
1383  method,
1384  reply->status_code,
1385  reply->reason);
1386  av_log(s, AV_LOG_DEBUG, "%s\n", rt->last_reply);
1387  }
1388 
1389  return 0;
1390 }
1391 
1392 int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
1393  int lower_transport, const char *real_challenge)
1394 {
1395  RTSPState *rt = s->priv_data;
1396  int rtx = 0, j, i, err, interleave = 0, port_off;
1397  RTSPStream *rtsp_st;
1398  RTSPMessageHeader reply1, *reply = &reply1;
1399  char cmd[2048];
1400  const char *trans_pref;
1401 
1402  if (rt->transport == RTSP_TRANSPORT_RDT)
1403  trans_pref = "x-pn-tng";
1404  else if (rt->transport == RTSP_TRANSPORT_RAW)
1405  trans_pref = "RAW/RAW";
1406  else
1407  trans_pref = "RTP/AVP";
1408 
1409  /* default timeout: 1 minute */
1410  rt->timeout = 60;
1411 
1412  /* Choose a random starting offset within the first half of the
1413  * port range, to allow for a number of ports to try even if the offset
1414  * happens to be at the end of the random range. */
1415  port_off = av_get_random_seed() % ((rt->rtp_port_max - rt->rtp_port_min)/2);
1416  /* even random offset */
1417  port_off -= port_off & 0x01;
1418 
1419  for (j = rt->rtp_port_min + port_off, i = 0; i < rt->nb_rtsp_streams; ++i) {
1420  char transport[2048];
1421 
1422  /*
1423  * WMS serves all UDP data over a single connection, the RTX, which
1424  * isn't necessarily the first in the SDP but has to be the first
1425  * to be set up, else the second/third SETUP will fail with a 461.
1426  */
1427  if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1428  rt->server_type == RTSP_SERVER_WMS) {
1429  if (i == 0) {
1430  /* rtx first */
1431  for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1432  int len = strlen(rt->rtsp_streams[rtx]->control_url);
1433  if (len >= 4 &&
1434  !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1435  "/rtx"))
1436  break;
1437  }
1438  if (rtx == rt->nb_rtsp_streams)
1439  return -1; /* no RTX found */
1440  rtsp_st = rt->rtsp_streams[rtx];
1441  } else
1442  rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1443  } else
1444  rtsp_st = rt->rtsp_streams[i];
1445 
1446  /* RTP/UDP */
1447  if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1448  char buf[256];
1449 
1450  if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1451  port = reply->transports[0].client_port_min;
1452  goto have_port;
1453  }
1454 
1455  /* first try in specified port range */
1456  while (j <= rt->rtp_port_max) {
1457  AVDictionary *opts = map_to_opts(rt);
1458 
1459  ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1460  "?localport=%d", j);
1461  /* we will use two ports per rtp stream (rtp and rtcp) */
1462  j += 2;
1463  err = ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
1464  &s->interrupt_callback, &opts);
1465 
1466  av_dict_free(&opts);
1467 
1468  if (!err)
1469  goto rtp_opened;
1470  }
1471  av_log(s, AV_LOG_ERROR, "Unable to open an input RTP port\n");
1472  err = AVERROR(EIO);
1473  goto fail;
1474 
1475  rtp_opened:
1476  port = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
1477  have_port:
1478  snprintf(transport, sizeof(transport) - 1,
1479  "%s/UDP;", trans_pref);
1480  if (rt->server_type != RTSP_SERVER_REAL)
1481  av_strlcat(transport, "unicast;", sizeof(transport));
1482  av_strlcatf(transport, sizeof(transport),
1483  "client_port=%d", port);
1484  if (rt->transport == RTSP_TRANSPORT_RTP &&
1485  !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1486  av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1487  }
1488 
1489  /* RTP/TCP */
1490  else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1491  /* For WMS streams, the application streams are only used for
1492  * UDP. When trying to set it up for TCP streams, the server
1493  * will return an error. Therefore, we skip those streams. */
1494  if (rt->server_type == RTSP_SERVER_WMS &&
1495  (rtsp_st->stream_index < 0 ||
1496  s->streams[rtsp_st->stream_index]->codec->codec_type ==
1498  continue;
1499  snprintf(transport, sizeof(transport) - 1,
1500  "%s/TCP;", trans_pref);
1501  if (rt->transport != RTSP_TRANSPORT_RDT)
1502  av_strlcat(transport, "unicast;", sizeof(transport));
1503  av_strlcatf(transport, sizeof(transport),
1504  "interleaved=%d-%d",
1505  interleave, interleave + 1);
1506  interleave += 2;
1507  }
1508 
1509  else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1510  snprintf(transport, sizeof(transport) - 1,
1511  "%s/UDP;multicast", trans_pref);
1512  }
1513  if (s->oformat) {
1514  av_strlcat(transport, ";mode=record", sizeof(transport));
1515  } else if (rt->server_type == RTSP_SERVER_REAL ||
1517  av_strlcat(transport, ";mode=play", sizeof(transport));
1518  snprintf(cmd, sizeof(cmd),
1519  "Transport: %s\r\n",
1520  transport);
1521  if (rt->accept_dynamic_rate)
1522  av_strlcat(cmd, "x-Dynamic-Rate: 0\r\n", sizeof(cmd));
1523  if (CONFIG_RTPDEC && i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1524  char real_res[41], real_csum[9];
1525  ff_rdt_calc_response_and_checksum(real_res, real_csum,
1526  real_challenge);
1527  av_strlcatf(cmd, sizeof(cmd),
1528  "If-Match: %s\r\n"
1529  "RealChallenge2: %s, sd=%s\r\n",
1530  rt->session_id, real_res, real_csum);
1531  }
1532  ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1533  if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1534  err = 1;
1535  goto fail;
1536  } else if (reply->status_code != RTSP_STATUS_OK ||
1537  reply->nb_transports != 1) {
1539  goto fail;
1540  }
1541 
1542  /* XXX: same protocol for all streams is required */
1543  if (i > 0) {
1544  if (reply->transports[0].lower_transport != rt->lower_transport ||
1545  reply->transports[0].transport != rt->transport) {
1546  err = AVERROR_INVALIDDATA;
1547  goto fail;
1548  }
1549  } else {
1550  rt->lower_transport = reply->transports[0].lower_transport;
1551  rt->transport = reply->transports[0].transport;
1552  }
1553 
1554  /* Fail if the server responded with another lower transport mode
1555  * than what we requested. */
1556  if (reply->transports[0].lower_transport != lower_transport) {
1557  av_log(s, AV_LOG_ERROR, "Nonmatching transport in server reply\n");
1558  err = AVERROR_INVALIDDATA;
1559  goto fail;
1560  }
1561 
1562  switch(reply->transports[0].lower_transport) {
1564  rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1565  rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1566  break;
1567 
1568  case RTSP_LOWER_TRANSPORT_UDP: {
1569  char url[1024], options[30] = "";
1570  const char *peer = host;
1571 
1572  if (rt->rtsp_flags & RTSP_FLAG_FILTER_SRC)
1573  av_strlcpy(options, "?connect=1", sizeof(options));
1574  /* Use source address if specified */
1575  if (reply->transports[0].source[0])
1576  peer = reply->transports[0].source;
1577  ff_url_join(url, sizeof(url), "rtp", NULL, peer,
1578  reply->transports[0].server_port_min, "%s", options);
1579  if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1580  ff_rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1581  err = AVERROR_INVALIDDATA;
1582  goto fail;
1583  }
1584  break;
1585  }
1587  char url[1024], namebuf[50], optbuf[20] = "";
1588  struct sockaddr_storage addr;
1589  int port, ttl;
1590 
1591  if (reply->transports[0].destination.ss_family) {
1592  addr = reply->transports[0].destination;
1593  port = reply->transports[0].port_min;
1594  ttl = reply->transports[0].ttl;
1595  } else {
1596  addr = rtsp_st->sdp_ip;
1597  port = rtsp_st->sdp_port;
1598  ttl = rtsp_st->sdp_ttl;
1599  }
1600  if (ttl > 0)
1601  snprintf(optbuf, sizeof(optbuf), "?ttl=%d", ttl);
1602  getnameinfo((struct sockaddr*) &addr, sizeof(addr),
1603  namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
1604  ff_url_join(url, sizeof(url), "rtp", NULL, namebuf,
1605  port, "%s", optbuf);
1606  if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
1607  &s->interrupt_callback, NULL) < 0) {
1608  err = AVERROR_INVALIDDATA;
1609  goto fail;
1610  }
1611  break;
1612  }
1613  }
1614 
1615  if ((err = ff_rtsp_open_transport_ctx(s, rtsp_st)))
1616  goto fail;
1617  }
1618 
1619  if (rt->nb_rtsp_streams && reply->timeout > 0)
1620  rt->timeout = reply->timeout;
1621 
1622  if (rt->server_type == RTSP_SERVER_REAL)
1623  rt->need_subscription = 1;
1624 
1625  return 0;
1626 
1627 fail:
1628  ff_rtsp_undo_setup(s, 0);
1629  return err;
1630 }
1631 
1633 {
1634  RTSPState *rt = s->priv_data;
1635  if (rt->rtsp_hd_out != rt->rtsp_hd) ffurl_close(rt->rtsp_hd_out);
1636  ffurl_close(rt->rtsp_hd);
1637  rt->rtsp_hd = rt->rtsp_hd_out = NULL;
1638 }
1639 
1641 {
1642  RTSPState *rt = s->priv_data;
1643  char proto[128], host[1024], path[1024];
1644  char tcpname[1024], cmd[2048], auth[128];
1645  const char *lower_rtsp_proto = "tcp";
1646  int port, err, tcp_fd;
1647  RTSPMessageHeader reply1 = {0}, *reply = &reply1;
1648  int lower_transport_mask = 0;
1649  int default_port = RTSP_DEFAULT_PORT;
1650  char real_challenge[64] = "";
1651  struct sockaddr_storage peer;
1652  socklen_t peer_len = sizeof(peer);
1653 
1654  if (rt->rtp_port_max < rt->rtp_port_min) {
1655  av_log(s, AV_LOG_ERROR, "Invalid UDP port range, max port %d less "
1656  "than min port %d\n", rt->rtp_port_max,
1657  rt->rtp_port_min);
1658  return AVERROR(EINVAL);
1659  }
1660 
1661  if (!ff_network_init())
1662  return AVERROR(EIO);
1663 
1664  if (s->max_delay < 0) /* Not set by the caller */
1666 
1671  }
1672  /* Only pass through valid flags from here */
1674 
1675 redirect:
1676  /* extract hostname and port */
1677  av_url_split(proto, sizeof(proto), auth, sizeof(auth),
1678  host, sizeof(host), &port, path, sizeof(path), s->filename);
1679 
1680  if (!strcmp(proto, "rtsps")) {
1681  lower_rtsp_proto = "tls";
1682  default_port = RTSPS_DEFAULT_PORT;
1684  }
1685 
1686  if (*auth) {
1687  av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1688  }
1689  if (port < 0)
1690  port = default_port;
1691 
1692  lower_transport_mask = rt->lower_transport_mask;
1693 
1694  if (!lower_transport_mask)
1695  lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1696 
1697  if (s->oformat) {
1698  /* Only UDP or TCP - UDP multicast isn't supported. */
1699  lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1700  (1 << RTSP_LOWER_TRANSPORT_TCP);
1701  if (!lower_transport_mask || rt->control_transport == RTSP_MODE_TUNNEL) {
1702  av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1703  "only UDP and TCP are supported for output.\n");
1704  err = AVERROR(EINVAL);
1705  goto fail;
1706  }
1707  }
1708 
1709  /* Construct the URI used in request; this is similar to s->filename,
1710  * but with authentication credentials removed and RTSP specific options
1711  * stripped out. */
1712  ff_url_join(rt->control_uri, sizeof(rt->control_uri), proto, NULL,
1713  host, port, "%s", path);
1714 
1715  if (rt->control_transport == RTSP_MODE_TUNNEL) {
1716  /* set up initial handshake for tunneling */
1717  char httpname[1024];
1718  char sessioncookie[17];
1719  char headers[1024];
1720 
1721  ff_url_join(httpname, sizeof(httpname), "http", auth, host, port, "%s", path);
1722  snprintf(sessioncookie, sizeof(sessioncookie), "%08x%08x",
1724 
1725  /* GET requests */
1726  if (ffurl_alloc(&rt->rtsp_hd, httpname, AVIO_FLAG_READ,
1727  &s->interrupt_callback) < 0) {
1728  err = AVERROR(EIO);
1729  goto fail;
1730  }
1731 
1732  /* generate GET headers */
1733  snprintf(headers, sizeof(headers),
1734  "x-sessioncookie: %s\r\n"
1735  "Accept: application/x-rtsp-tunnelled\r\n"
1736  "Pragma: no-cache\r\n"
1737  "Cache-Control: no-cache\r\n",
1738  sessioncookie);
1739  av_opt_set(rt->rtsp_hd->priv_data, "headers", headers, 0);
1740 
1741  /* complete the connection */
1742  if (ffurl_connect(rt->rtsp_hd, NULL)) {
1743  err = AVERROR(EIO);
1744  goto fail;
1745  }
1746 
1747  /* POST requests */
1748  if (ffurl_alloc(&rt->rtsp_hd_out, httpname, AVIO_FLAG_WRITE,
1749  &s->interrupt_callback) < 0 ) {
1750  err = AVERROR(EIO);
1751  goto fail;
1752  }
1753 
1754  /* generate POST headers */
1755  snprintf(headers, sizeof(headers),
1756  "x-sessioncookie: %s\r\n"
1757  "Content-Type: application/x-rtsp-tunnelled\r\n"
1758  "Pragma: no-cache\r\n"
1759  "Cache-Control: no-cache\r\n"
1760  "Content-Length: 32767\r\n"
1761  "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
1762  sessioncookie);
1763  av_opt_set(rt->rtsp_hd_out->priv_data, "headers", headers, 0);
1764  av_opt_set(rt->rtsp_hd_out->priv_data, "chunked_post", "0", 0);
1765 
1766  /* Initialize the authentication state for the POST session. The HTTP
1767  * protocol implementation doesn't properly handle multi-pass
1768  * authentication for POST requests, since it would require one of
1769  * the following:
1770  * - implementing Expect: 100-continue, which many HTTP servers
1771  * don't support anyway, even less the RTSP servers that do HTTP
1772  * tunneling
1773  * - sending the whole POST data until getting a 401 reply specifying
1774  * what authentication method to use, then resending all that data
1775  * - waiting for potential 401 replies directly after sending the
1776  * POST header (waiting for some unspecified time)
1777  * Therefore, we copy the full auth state, which works for both basic
1778  * and digest. (For digest, we would have to synchronize the nonce
1779  * count variable between the two sessions, if we'd do more requests
1780  * with the original session, though.)
1781  */
1783 
1784  /* complete the connection */
1785  if (ffurl_connect(rt->rtsp_hd_out, NULL)) {
1786  err = AVERROR(EIO);
1787  goto fail;
1788  }
1789  } else {
1790  int ret;
1791  /* open the tcp connection */
1792  ff_url_join(tcpname, sizeof(tcpname), lower_rtsp_proto, NULL,
1793  host, port,
1794  "?timeout=%d", rt->stimeout);
1795  if ((ret = ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
1796  &s->interrupt_callback, NULL)) < 0) {
1797  err = ret;
1798  goto fail;
1799  }
1800  rt->rtsp_hd_out = rt->rtsp_hd;
1801  }
1802  rt->seq = 0;
1803 
1804  tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
1805  if (tcp_fd < 0) {
1806  err = tcp_fd;
1807  goto fail;
1808  }
1809  if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1810  getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1811  NULL, 0, NI_NUMERICHOST);
1812  }
1813 
1814  /* request options supported by the server; this also detects server
1815  * type */
1816  for (rt->server_type = RTSP_SERVER_RTP;;) {
1817  cmd[0] = 0;
1818  if (rt->server_type == RTSP_SERVER_REAL)
1819  av_strlcat(cmd,
1820  /*
1821  * The following entries are required for proper
1822  * streaming from a Realmedia server. They are
1823  * interdependent in some way although we currently
1824  * don't quite understand how. Values were copied
1825  * from mplayer SVN r23589.
1826  * ClientChallenge is a 16-byte ID in hex
1827  * CompanyID is a 16-byte ID in base64
1828  */
1829  "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1830  "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1831  "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1832  "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1833  sizeof(cmd));
1834  ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1835  if (reply->status_code != RTSP_STATUS_OK) {
1837  goto fail;
1838  }
1839 
1840  /* detect server type if not standard-compliant RTP */
1841  if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1843  continue;
1844  } else if (!av_strncasecmp(reply->server, "WMServer/", 9)) {
1846  } else if (rt->server_type == RTSP_SERVER_REAL)
1847  strcpy(real_challenge, reply->real_challenge);
1848  break;
1849  }
1850 
1851  if (CONFIG_RTSP_DEMUXER && s->iformat)
1852  err = ff_rtsp_setup_input_streams(s, reply);
1853  else if (CONFIG_RTSP_MUXER)
1854  err = ff_rtsp_setup_output_streams(s, host);
1855  else
1856  av_assert0(0);
1857  if (err)
1858  goto fail;
1859 
1860  do {
1861  int lower_transport = ff_log2_tab[lower_transport_mask &
1862  ~(lower_transport_mask - 1)];
1863 
1864  if ((lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP))
1865  && (rt->rtsp_flags & RTSP_FLAG_PREFER_TCP))
1866  lower_transport = RTSP_LOWER_TRANSPORT_TCP;
1867 
1868  err = ff_rtsp_make_setup_request(s, host, port, lower_transport,
1869  rt->server_type == RTSP_SERVER_REAL ?
1870  real_challenge : NULL);
1871  if (err < 0)
1872  goto fail;
1873  lower_transport_mask &= ~(1 << lower_transport);
1874  if (lower_transport_mask == 0 && err == 1) {
1875  err = AVERROR(EPROTONOSUPPORT);
1876  goto fail;
1877  }
1878  } while (err);
1879 
1880  rt->lower_transport_mask = lower_transport_mask;
1881  av_strlcpy(rt->real_challenge, real_challenge, sizeof(rt->real_challenge));
1882  rt->state = RTSP_STATE_IDLE;
1883  rt->seek_timestamp = 0; /* default is to start stream at position zero */
1884  return 0;
1885  fail:
1888  if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1889  av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1890  rt->session_id[0] = '\0';
1891  av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1892  reply->status_code,
1893  s->filename);
1894  goto redirect;
1895  }
1896  ff_network_close();
1897  return err;
1898 }
1899 #endif /* CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER */
1900 
1901 #if CONFIG_RTPDEC
1902 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1903  uint8_t *buf, int buf_size, int64_t wait_end)
1904 {
1905  RTSPState *rt = s->priv_data;
1906  RTSPStream *rtsp_st;
1907  int n, i, ret, tcp_fd, timeout_cnt = 0;
1908  int max_p = 0;
1909  struct pollfd *p = rt->p;
1910  int *fds = NULL, fdsnum, fdsidx;
1911 
1912  for (;;) {
1914  return AVERROR_EXIT;
1915  if (wait_end && wait_end - av_gettime_relative() < 0)
1916  return AVERROR(EAGAIN);
1917  max_p = 0;
1918  if (rt->rtsp_hd) {
1919  tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
1920  p[max_p].fd = tcp_fd;
1921  p[max_p++].events = POLLIN;
1922  } else {
1923  tcp_fd = -1;
1924  }
1925  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1926  rtsp_st = rt->rtsp_streams[i];
1927  if (rtsp_st->rtp_handle) {
1928  if (ret = ffurl_get_multi_file_handle(rtsp_st->rtp_handle,
1929  &fds, &fdsnum)) {
1930  av_log(s, AV_LOG_ERROR, "Unable to recover rtp ports\n");
1931  return ret;
1932  }
1933  if (fdsnum != 2) {
1934  av_log(s, AV_LOG_ERROR,
1935  "Number of fds %d not supported\n", fdsnum);
1936  return AVERROR_INVALIDDATA;
1937  }
1938  for (fdsidx = 0; fdsidx < fdsnum; fdsidx++) {
1939  p[max_p].fd = fds[fdsidx];
1940  p[max_p++].events = POLLIN;
1941  }
1942  av_freep(&fds);
1943  }
1944  }
1945  n = poll(p, max_p, POLL_TIMEOUT_MS);
1946  if (n > 0) {
1947  int j = 1 - (tcp_fd == -1);
1948  timeout_cnt = 0;
1949  for (i = 0; i < rt->nb_rtsp_streams; i++) {
1950  rtsp_st = rt->rtsp_streams[i];
1951  if (rtsp_st->rtp_handle) {
1952  if (p[j].revents & POLLIN || p[j+1].revents & POLLIN) {
1953  ret = ffurl_read(rtsp_st->rtp_handle, buf, buf_size);
1954  if (ret > 0) {
1955  *prtsp_st = rtsp_st;
1956  return ret;
1957  }
1958  }
1959  j+=2;
1960  }
1961  }
1962 #if CONFIG_RTSP_DEMUXER
1963  if (tcp_fd != -1 && p[0].revents & POLLIN) {
1964  if (rt->rtsp_flags & RTSP_FLAG_LISTEN) {
1965  if (rt->state == RTSP_STATE_STREAMING) {
1967  return AVERROR_EOF;
1968  else
1970  "Unable to answer to TEARDOWN\n");
1971  } else
1972  return 0;
1973  } else {
1974  RTSPMessageHeader reply;
1975  ret = ff_rtsp_read_reply(s, &reply, NULL, 0, NULL);
1976  if (ret < 0)
1977  return ret;
1978  /* XXX: parse message */
1979  if (rt->state != RTSP_STATE_STREAMING)
1980  return 0;
1981  }
1982  }
1983 #endif
1984  } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1985  return AVERROR(ETIMEDOUT);
1986  } else if (n < 0 && errno != EINTR)
1987  return AVERROR(errno);
1988  }
1989 }
1990 
1991 static int pick_stream(AVFormatContext *s, RTSPStream **rtsp_st,
1992  const uint8_t *buf, int len)
1993 {
1994  RTSPState *rt = s->priv_data;
1995  int i;
1996  if (len < 0)
1997  return len;
1998  if (rt->nb_rtsp_streams == 1) {
1999  *rtsp_st = rt->rtsp_streams[0];
2000  return len;
2001  }
2002  if (len >= 8 && rt->transport == RTSP_TRANSPORT_RTP) {
2003  if (RTP_PT_IS_RTCP(rt->recvbuf[1])) {
2004  int no_ssrc = 0;
2005  for (i = 0; i < rt->nb_rtsp_streams; i++) {
2006  RTPDemuxContext *rtpctx = rt->rtsp_streams[i]->transport_priv;
2007  if (!rtpctx)
2008  continue;
2009  if (rtpctx->ssrc == AV_RB32(&buf[4])) {
2010  *rtsp_st = rt->rtsp_streams[i];
2011  return len;
2012  }
2013  if (!rtpctx->ssrc)
2014  no_ssrc = 1;
2015  }
2016  if (no_ssrc) {
2018  "Unable to pick stream for packet - SSRC not known for "
2019  "all streams\n");
2020  return AVERROR(EAGAIN);
2021  }
2022  } else {
2023  for (i = 0; i < rt->nb_rtsp_streams; i++) {
2024  if ((buf[1] & 0x7f) == rt->rtsp_streams[i]->sdp_payload_type) {
2025  *rtsp_st = rt->rtsp_streams[i];
2026  return len;
2027  }
2028  }
2029  }
2030  }
2031  av_log(s, AV_LOG_WARNING, "Unable to pick stream for packet\n");
2032  return AVERROR(EAGAIN);
2033 }
2034 
2036 {
2037  RTSPState *rt = s->priv_data;
2038  int ret, len;
2039  RTSPStream *rtsp_st, *first_queue_st = NULL;
2040  int64_t wait_end = 0;
2041 
2042  if (rt->nb_byes == rt->nb_rtsp_streams)
2043  return AVERROR_EOF;
2044 
2045  /* get next frames from the same RTP packet */
2046  if (rt->cur_transport_priv) {
2047  if (rt->transport == RTSP_TRANSPORT_RDT) {
2048  ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
2049  } else if (rt->transport == RTSP_TRANSPORT_RTP) {
2050  ret = ff_rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
2051  } else if (CONFIG_RTPDEC && rt->ts) {
2052  ret = avpriv_mpegts_parse_packet(rt->ts, pkt, rt->recvbuf + rt->recvbuf_pos, rt->recvbuf_len - rt->recvbuf_pos);
2053  if (ret >= 0) {
2054  rt->recvbuf_pos += ret;
2055  ret = rt->recvbuf_pos < rt->recvbuf_len;
2056  }
2057  } else
2058  ret = -1;
2059  if (ret == 0) {
2060  rt->cur_transport_priv = NULL;
2061  return 0;
2062  } else if (ret == 1) {
2063  return 0;
2064  } else
2065  rt->cur_transport_priv = NULL;
2066  }
2067 
2068 redo:
2069  if (rt->transport == RTSP_TRANSPORT_RTP) {
2070  int i;
2071  int64_t first_queue_time = 0;
2072  for (i = 0; i < rt->nb_rtsp_streams; i++) {
2073  RTPDemuxContext *rtpctx = rt->rtsp_streams[i]->transport_priv;
2074  int64_t queue_time;
2075  if (!rtpctx)
2076  continue;
2077  queue_time = ff_rtp_queued_packet_time(rtpctx);
2078  if (queue_time && (queue_time - first_queue_time < 0 ||
2079  !first_queue_time)) {
2080  first_queue_time = queue_time;
2081  first_queue_st = rt->rtsp_streams[i];
2082  }
2083  }
2084  if (first_queue_time) {
2085  wait_end = first_queue_time + s->max_delay;
2086  } else {
2087  wait_end = 0;
2088  first_queue_st = NULL;
2089  }
2090  }
2091 
2092  /* read next RTP packet */
2093  if (!rt->recvbuf) {
2095  if (!rt->recvbuf)
2096  return AVERROR(ENOMEM);
2097  }
2098 
2099  switch(rt->lower_transport) {
2100  default:
2101 #if CONFIG_RTSP_DEMUXER
2103  len = ff_rtsp_tcp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE);
2104  break;
2105 #endif
2108  len = udp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE, wait_end);
2109  if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
2110  ff_rtp_check_and_send_back_rr(rtsp_st->transport_priv, rtsp_st->rtp_handle, NULL, len);
2111  break;
2113  if (first_queue_st && rt->transport == RTSP_TRANSPORT_RTP &&
2114  wait_end && wait_end < av_gettime_relative())
2115  len = AVERROR(EAGAIN);
2116  else
2117  len = ffio_read_partial(s->pb, rt->recvbuf, RECVBUF_SIZE);
2118  len = pick_stream(s, &rtsp_st, rt->recvbuf, len);
2119  if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
2121  break;
2122  }
2123  if (len == AVERROR(EAGAIN) && first_queue_st &&
2124  rt->transport == RTSP_TRANSPORT_RTP) {
2125  rtsp_st = first_queue_st;
2126  ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, NULL, 0);
2127  goto end;
2128  }
2129  if (len < 0)
2130  return len;
2131  if (len == 0)
2132  return AVERROR_EOF;
2133  if (rt->transport == RTSP_TRANSPORT_RDT) {
2134  ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
2135  } else if (rt->transport == RTSP_TRANSPORT_RTP) {
2136  ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
2137  if (rtsp_st->feedback) {
2138  AVIOContext *pb = NULL;
2140  pb = s->pb;
2141  ff_rtp_send_rtcp_feedback(rtsp_st->transport_priv, rtsp_st->rtp_handle, pb);
2142  }
2143  if (ret < 0) {
2144  /* Either bad packet, or a RTCP packet. Check if the
2145  * first_rtcp_ntp_time field was initialized. */
2146  RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
2147  if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
2148  /* first_rtcp_ntp_time has been initialized for this stream,
2149  * copy the same value to all other uninitialized streams,
2150  * in order to map their timestamp origin to the same ntp time
2151  * as this one. */
2152  int i;
2153  AVStream *st = NULL;
2154  if (rtsp_st->stream_index >= 0)
2155  st = s->streams[rtsp_st->stream_index];
2156  for (i = 0; i < rt->nb_rtsp_streams; i++) {
2157  RTPDemuxContext *rtpctx2 = rt->rtsp_streams[i]->transport_priv;
2158  AVStream *st2 = NULL;
2159  if (rt->rtsp_streams[i]->stream_index >= 0)
2160  st2 = s->streams[rt->rtsp_streams[i]->stream_index];
2161  if (rtpctx2 && st && st2 &&
2162  rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
2163  rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
2164  rtpctx2->rtcp_ts_offset = av_rescale_q(
2165  rtpctx->rtcp_ts_offset, st->time_base,
2166  st2->time_base);
2167  }
2168  }
2169  // Make real NTP start time available in AVFormatContext
2170  if (s->start_time_realtime == AV_NOPTS_VALUE) {
2171  s->start_time_realtime = av_rescale (rtpctx->first_rtcp_ntp_time - (NTP_OFFSET << 32), 1000000, 1LL << 32);
2172  if (rtpctx->st) {
2173  s->start_time_realtime -=
2174  av_rescale (rtpctx->rtcp_ts_offset,
2175  (uint64_t) rtpctx->st->time_base.num * 1000000,
2176  rtpctx->st->time_base.den);
2177  }
2178  }
2179  }
2180  if (ret == -RTCP_BYE) {
2181  rt->nb_byes++;
2182 
2183  av_log(s, AV_LOG_DEBUG, "Received BYE for stream %d (%d/%d)\n",
2184  rtsp_st->stream_index, rt->nb_byes, rt->nb_rtsp_streams);
2185 
2186  if (rt->nb_byes == rt->nb_rtsp_streams)
2187  return AVERROR_EOF;
2188  }
2189  }
2190  } else if (CONFIG_RTPDEC && rt->ts) {
2191  ret = avpriv_mpegts_parse_packet(rt->ts, pkt, rt->recvbuf, len);
2192  if (ret >= 0) {
2193  if (ret < len) {
2194  rt->recvbuf_len = len;
2195  rt->recvbuf_pos = ret;
2196  rt->cur_transport_priv = rt->ts;
2197  return 1;
2198  } else {
2199  ret = 0;
2200  }
2201  }
2202  } else {
2203  return AVERROR_INVALIDDATA;
2204  }
2205 end:
2206  if (ret < 0)
2207  goto redo;
2208  if (ret == 1)
2209  /* more packets may follow, so we save the RTP context */
2210  rt->cur_transport_priv = rtsp_st->transport_priv;
2211 
2212  return ret;
2213 }
2214 #endif /* CONFIG_RTPDEC */
2215 
2216 #if CONFIG_SDP_DEMUXER
2217 static int sdp_probe(AVProbeData *p1)
2218 {
2219  const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
2220 
2221  /* we look for a line beginning "c=IN IP" */
2222  while (p < p_end && *p != '\0') {
2223  if (sizeof("c=IN IP") - 1 < p_end - p &&
2224  av_strstart(p, "c=IN IP", NULL))
2225  return AVPROBE_SCORE_EXTENSION;
2226 
2227  while (p < p_end - 1 && *p != '\n') p++;
2228  if (++p >= p_end)
2229  break;
2230  if (*p == '\r')
2231  p++;
2232  }
2233  return 0;
2234 }
2235 
2236 static void append_source_addrs(char *buf, int size, const char *name,
2237  int count, struct RTSPSource **addrs)
2238 {
2239  int i;
2240  if (!count)
2241  return;
2242  av_strlcatf(buf, size, "&%s=%s", name, addrs[0]->addr);
2243  for (i = 1; i < count; i++)
2244  av_strlcatf(buf, size, ",%s", addrs[i]->addr);
2245 }
2246 
2247 static int sdp_read_header(AVFormatContext *s)
2248 {
2249  RTSPState *rt = s->priv_data;
2250  RTSPStream *rtsp_st;
2251  int size, i, err;
2252  char *content;
2253  char url[1024];
2254 
2255  if (!ff_network_init())
2256  return AVERROR(EIO);
2257 
2258  if (s->max_delay < 0) /* Not set by the caller */
2260  if (rt->rtsp_flags & RTSP_FLAG_CUSTOM_IO)
2262 
2263  /* read the whole sdp file */
2264  /* XXX: better loading */
2265  content = av_malloc(SDP_MAX_SIZE);
2266  if (!content)
2267  return AVERROR(ENOMEM);
2268  size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);
2269  if (size <= 0) {
2270  av_free(content);
2271  return AVERROR_INVALIDDATA;
2272  }
2273  content[size] ='\0';
2274 
2275  err = ff_sdp_parse(s, content);
2276  av_freep(&content);
2277  if (err) goto fail;
2278 
2279  /* open each RTP stream */
2280  for (i = 0; i < rt->nb_rtsp_streams; i++) {
2281  char namebuf[50];
2282  rtsp_st = rt->rtsp_streams[i];
2283 
2284  if (!(rt->rtsp_flags & RTSP_FLAG_CUSTOM_IO)) {
2285  AVDictionary *opts = map_to_opts(rt);
2286 
2287  getnameinfo((struct sockaddr*) &rtsp_st->sdp_ip, sizeof(rtsp_st->sdp_ip),
2288  namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
2289  ff_url_join(url, sizeof(url), "rtp", NULL,
2290  namebuf, rtsp_st->sdp_port,
2291  "?localport=%d&ttl=%d&connect=%d&write_to_source=%d",
2292  rtsp_st->sdp_port, rtsp_st->sdp_ttl,
2293  rt->rtsp_flags & RTSP_FLAG_FILTER_SRC ? 1 : 0,
2294  rt->rtsp_flags & RTSP_FLAG_RTCP_TO_SOURCE ? 1 : 0);
2295 
2296  append_source_addrs(url, sizeof(url), "sources",
2297  rtsp_st->nb_include_source_addrs,
2298  rtsp_st->include_source_addrs);
2299  append_source_addrs(url, sizeof(url), "block",
2300  rtsp_st->nb_exclude_source_addrs,
2301  rtsp_st->exclude_source_addrs);
2302  err = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
2303  &s->interrupt_callback, &opts);
2304 
2305  av_dict_free(&opts);
2306 
2307  if (err < 0) {
2308  err = AVERROR_INVALIDDATA;
2309  goto fail;
2310  }
2311  }
2312  if ((err = ff_rtsp_open_transport_ctx(s, rtsp_st)))
2313  goto fail;
2314  }
2315  return 0;
2316 fail:
2318  ff_network_close();
2319  return err;
2320 }
2321 
2322 static int sdp_read_close(AVFormatContext *s)
2323 {
2325  ff_network_close();
2326  return 0;
2327 }
2328 
2329 static const AVClass sdp_demuxer_class = {
2330  .class_name = "SDP demuxer",
2331  .item_name = av_default_item_name,
2332  .option = sdp_options,
2333  .version = LIBAVUTIL_VERSION_INT,
2334 };
2335 
2336 AVInputFormat ff_sdp_demuxer = {
2337  .name = "sdp",
2338  .long_name = NULL_IF_CONFIG_SMALL("SDP"),
2339  .priv_data_size = sizeof(RTSPState),
2340  .read_probe = sdp_probe,
2341  .read_header = sdp_read_header,
2343  .read_close = sdp_read_close,
2344  .priv_class = &sdp_demuxer_class,
2345 };
2346 #endif /* CONFIG_SDP_DEMUXER */
2347 
2348 #if CONFIG_RTP_DEMUXER
2349 static int rtp_probe(AVProbeData *p)
2350 {
2351  if (av_strstart(p->filename, "rtp:", NULL))
2352  return AVPROBE_SCORE_MAX;
2353  return 0;
2354 }
2355 
2356 static int rtp_read_header(AVFormatContext *s)
2357 {
2358  uint8_t recvbuf[RTP_MAX_PACKET_LENGTH];
2359  char host[500], sdp[500];
2360  int ret, port;
2361  URLContext* in = NULL;
2362  int payload_type;
2363  AVCodecContext codec = { 0 };
2364  struct sockaddr_storage addr;
2365  AVIOContext pb;
2366  socklen_t addrlen = sizeof(addr);
2367  RTSPState *rt = s->priv_data;
2368 
2369  if (!ff_network_init())
2370  return AVERROR(EIO);
2371 
2372  ret = ffurl_open(&in, s->filename, AVIO_FLAG_READ,
2373  &s->interrupt_callback, NULL);
2374  if (ret)
2375  goto fail;
2376 
2377  while (1) {
2378  ret = ffurl_read(in, recvbuf, sizeof(recvbuf));
2379  if (ret == AVERROR(EAGAIN))
2380  continue;
2381  if (ret < 0)
2382  goto fail;
2383  if (ret < 12) {
2384  av_log(s, AV_LOG_WARNING, "Received too short packet\n");
2385  continue;
2386  }
2387 
2388  if ((recvbuf[0] & 0xc0) != 0x80) {
2389  av_log(s, AV_LOG_WARNING, "Unsupported RTP version packet "
2390  "received\n");
2391  continue;
2392  }
2393 
2394  if (RTP_PT_IS_RTCP(recvbuf[1]))
2395  continue;
2396 
2397  payload_type = recvbuf[1] & 0x7f;
2398  break;
2399  }
2400  getsockname(ffurl_get_file_handle(in), (struct sockaddr*) &addr, &addrlen);
2401  ffurl_close(in);
2402  in = NULL;
2403 
2404  if (ff_rtp_get_codec_info(&codec, payload_type)) {
2405  av_log(s, AV_LOG_ERROR, "Unable to receive RTP payload type %d "
2406  "without an SDP file describing it\n",
2407  payload_type);
2408  goto fail;
2409  }
2410  if (codec.codec_type != AVMEDIA_TYPE_DATA) {
2411  av_log(s, AV_LOG_WARNING, "Guessing on RTP content - if not received "
2412  "properly you need an SDP file "
2413  "describing it\n");
2414  }
2415 
2416  av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port,
2417  NULL, 0, s->filename);
2418 
2419  snprintf(sdp, sizeof(sdp),
2420  "v=0\r\nc=IN IP%d %s\r\nm=%s %d RTP/AVP %d\r\n",
2421  addr.ss_family == AF_INET ? 4 : 6, host,
2422  codec.codec_type == AVMEDIA_TYPE_DATA ? "application" :
2423  codec.codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio",
2424  port, payload_type);
2425  av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
2426 
2427  ffio_init_context(&pb, sdp, strlen(sdp), 0, NULL, NULL, NULL, NULL);
2428  s->pb = &pb;
2429 
2430  /* sdp_read_header initializes this again */
2431  ff_network_close();
2432 
2433  rt->media_type_mask = (1 << (AVMEDIA_TYPE_SUBTITLE+1)) - 1;
2434 
2435  ret = sdp_read_header(s);
2436  s->pb = NULL;
2437  return ret;
2438 
2439 fail:
2440  if (in)
2441  ffurl_close(in);
2442  ff_network_close();
2443  return ret;
2444 }
2445 
2446 static const AVClass rtp_demuxer_class = {
2447  .class_name = "RTP demuxer",
2448  .item_name = av_default_item_name,
2449  .option = rtp_options,
2450  .version = LIBAVUTIL_VERSION_INT,
2451 };
2452 
2453 AVInputFormat ff_rtp_demuxer = {
2454  .name = "rtp",
2455  .long_name = NULL_IF_CONFIG_SMALL("RTP input"),
2456  .priv_data_size = sizeof(RTSPState),
2457  .read_probe = rtp_probe,
2458  .read_header = rtp_read_header,
2460  .read_close = sdp_read_close,
2461  .flags = AVFMT_NOFILE,
2462  .priv_class = &rtp_demuxer_class,
2463 };
2464 #endif /* CONFIG_RTP_DEMUXER */