FFmpeg  4.3.9
rdt.c
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1 /*
2  * Realmedia RTSP protocol (RDT) support.
3  * Copyright (c) 2007 Ronald S. Bultje
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 /**
23  * @file
24  * @brief Realmedia RTSP protocol (RDT) support
25  * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
26  */
27 
28 #include "avformat.h"
29 #include "libavutil/avstring.h"
30 #include "rtpdec.h"
31 #include "rdt.h"
32 #include "libavutil/base64.h"
33 #include "libavutil/md5.h"
34 #include "rm.h"
35 #include "internal.h"
36 #include "avio_internal.h"
37 #include "libavcodec/get_bits.h"
38 
40  AVFormatContext *ic; /**< the containing (RTSP) demux context */
41  /** Each RDT stream-set (represented by one RTSPStream) can contain
42  * multiple streams (of the same content, but with possibly different
43  * codecs/bitrates). Each such stream is represented by one AVStream
44  * in the AVFormatContext, and this variable points to the offset in
45  * that array such that the first is the first stream of this set. */
47  int n_streams; /**< streams with identical content in this set */
50  uint32_t prev_timestamp;
52 };
53 
55 ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx,
56  void *priv_data, const RTPDynamicProtocolHandler *handler)
57 {
59  if (!s)
60  return NULL;
61 
62  s->ic = ic;
63  s->streams = &ic->streams[first_stream_of_set_idx];
64  do {
65  s->n_streams++;
66  } while (first_stream_of_set_idx + s->n_streams < ic->nb_streams &&
67  s->streams[s->n_streams]->id == s->streams[0]->id);
68  s->prev_set_id = -1;
69  s->prev_stream_id = -1;
70  s->prev_timestamp = -1;
71  s->parse_packet = handler ? handler->parse_packet : NULL;
72  s->dynamic_protocol_context = priv_data;
73 
74  return s;
75 }
76 
77 void
79 {
80  av_free(s);
81 }
82 
85  int nb_rmst;
88  unsigned int mlti_data_size;
90  int audio_pkt_cnt; /**< remaining audio packets in rmdec */
91 };
92 
93 void
94 ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
95  const char *challenge)
96 {
97  int ch_len = strlen (challenge), i;
98  unsigned char zres[16],
99  buf[64] = { 0xa1, 0xe9, 0x14, 0x9d, 0x0e, 0x6b, 0x3b, 0x59 };
100 #define XOR_TABLE_SIZE 37
101  static const unsigned char xor_table[XOR_TABLE_SIZE] = {
102  0x05, 0x18, 0x74, 0xd0, 0x0d, 0x09, 0x02, 0x53,
103  0xc0, 0x01, 0x05, 0x05, 0x67, 0x03, 0x19, 0x70,
104  0x08, 0x27, 0x66, 0x10, 0x10, 0x72, 0x08, 0x09,
105  0x63, 0x11, 0x03, 0x71, 0x08, 0x08, 0x70, 0x02,
106  0x10, 0x57, 0x05, 0x18, 0x54 };
107 
108  /* some (length) checks */
109  if (ch_len == 40) /* what a hack... */
110  ch_len = 32;
111  else if (ch_len > 56)
112  ch_len = 56;
113  memcpy(buf + 8, challenge, ch_len);
114 
115  /* xor challenge bytewise with xor_table */
116  for (i = 0; i < XOR_TABLE_SIZE; i++)
117  buf[8 + i] ^= xor_table[i];
118 
119  av_md5_sum(zres, buf, 64);
120  ff_data_to_hex(response, zres, 16, 1);
121 
122  /* add tail */
123  strcpy (response + 32, "01d0a8e3");
124 
125  /* calculate checksum */
126  for (i = 0; i < 8; i++)
127  chksum[i] = response[i * 4];
128  chksum[8] = 0;
129 }
130 
131 static int
132 rdt_load_mdpr (PayloadContext *rdt, AVStream *st, int rule_nr)
133 {
134  AVIOContext pb;
135  unsigned int size;
136  uint32_t tag;
137 
138  /**
139  * Layout of the MLTI chunk:
140  * 4: MLTI
141  * 2: number of streams
142  * Then for each stream ([number_of_streams] times):
143  * 2: mdpr index
144  * 2: number of mdpr chunks
145  * Then for each mdpr chunk ([number_of_mdpr_chunks] times):
146  * 4: size
147  * [size]: data
148  * we skip MDPR chunks until we reach the one of the stream
149  * we're interested in, and forward that ([size]+[data]) to
150  * the RM demuxer to parse the stream-specific header data.
151  */
152  if (!rdt->mlti_data)
153  return -1;
154  ffio_init_context(&pb, rdt->mlti_data, rdt->mlti_data_size, 0,
155  NULL, NULL, NULL, NULL);
156  tag = avio_rl32(&pb);
157  if (tag == MKTAG('M', 'L', 'T', 'I')) {
158  int num, chunk_nr;
159 
160  /* read index of MDPR chunk numbers */
161  num = avio_rb16(&pb);
162  if (rule_nr < 0 || rule_nr >= num)
163  return -1;
164  avio_skip(&pb, rule_nr * 2);
165  chunk_nr = avio_rb16(&pb);
166  avio_skip(&pb, (num - 1 - rule_nr) * 2);
167 
168  /* read MDPR chunks */
169  num = avio_rb16(&pb);
170  if (chunk_nr >= num)
171  return -1;
172  while (chunk_nr--)
173  avio_skip(&pb, avio_rb32(&pb));
174  size = avio_rb32(&pb);
175  } else {
176  size = rdt->mlti_data_size;
177  avio_seek(&pb, 0, SEEK_SET);
178  }
179  if (ff_rm_read_mdpr_codecdata(rdt->rmctx, &pb, st, rdt->rmst[st->index], size, NULL) < 0)
180  return -1;
181 
182  return 0;
183 }
184 
185 /**
186  * Actual data handling.
187  */
188 
189 int
191  int *pset_id, int *pseq_no, int *pstream_id,
192  int *pis_keyframe, uint32_t *ptimestamp)
193 {
194  GetBitContext gb;
195  int consumed = 0, set_id, seq_no, stream_id, is_keyframe,
196  len_included, need_reliable;
197  uint32_t timestamp;
198 
199  /* skip status packets */
200  while (len >= 5 && buf[1] == 0xFF /* status packet */) {
201  int pkt_len;
202 
203  if (!(buf[0] & 0x80))
204  return -1; /* not followed by a data packet */
205 
206  pkt_len = AV_RB16(buf+3);
207  if (pkt_len > len)
208  return AVERROR_INVALIDDATA;
209  buf += pkt_len;
210  len -= pkt_len;
211  consumed += pkt_len;
212  }
213  if (len < 16)
214  return -1;
215  /**
216  * Layout of the header (in bits):
217  * 1: len_included
218  * Flag indicating whether this header includes a length field;
219  * this can be used to concatenate multiple RDT packets in a
220  * single UDP/TCP data frame and is used to precede RDT data
221  * by stream status packets
222  * 1: need_reliable
223  * Flag indicating whether this header includes a "reliable
224  * sequence number"; these are apparently sequence numbers of
225  * data packets alone. For data packets, this flag is always
226  * set, according to the Real documentation [1]
227  * 5: set_id
228  * ID of a set of streams of identical content, possibly with
229  * different codecs or bitrates
230  * 1: is_reliable
231  * Flag set for certain streams deemed less tolerable for packet
232  * loss
233  * 16: seq_no
234  * Packet sequence number; if >=0xFF00, this is a non-data packet
235  * containing stream status info, the second byte indicates the
236  * type of status packet (see wireshark docs / source code [2])
237  * if (len_included) {
238  * 16: packet_len
239  * } else {
240  * packet_len = remainder of UDP/TCP frame
241  * }
242  * 1: is_back_to_back
243  * Back-to-Back flag; used for timing, set for one in every 10
244  * packets, according to the Real documentation [1]
245  * 1: is_slow_data
246  * Slow-data flag; currently unused, according to Real docs [1]
247  * 5: stream_id
248  * ID of the stream within this particular set of streams
249  * 1: is_no_keyframe
250  * Non-keyframe flag (unset if packet belongs to a keyframe)
251  * 32: timestamp (PTS)
252  * if (set_id == 0x1F) {
253  * 16: set_id (extended set-of-streams ID; see set_id)
254  * }
255  * if (need_reliable) {
256  * 16: reliable_seq_no
257  * Reliable sequence number (see need_reliable)
258  * }
259  * if (stream_id == 0x3F) {
260  * 16: stream_id (extended stream ID; see stream_id)
261  * }
262  * [1] https://protocol.helixcommunity.org/files/2005/devdocs/RDT_Feature_Level_20.txt
263  * [2] http://www.wireshark.org/docs/dfref/r/rdt.html and
264  * http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-rdt.c
265  */
266  init_get_bits(&gb, buf, len << 3);
267  len_included = get_bits1(&gb);
268  need_reliable = get_bits1(&gb);
269  set_id = get_bits(&gb, 5);
270  skip_bits(&gb, 1);
271  seq_no = get_bits(&gb, 16);
272  if (len_included)
273  skip_bits(&gb, 16);
274  skip_bits(&gb, 2);
275  stream_id = get_bits(&gb, 5);
276  is_keyframe = !get_bits1(&gb);
277  timestamp = get_bits_long(&gb, 32);
278  if (set_id == 0x1f)
279  set_id = get_bits(&gb, 16);
280  if (need_reliable)
281  skip_bits(&gb, 16);
282  if (stream_id == 0x1f)
283  stream_id = get_bits(&gb, 16);
284 
285  if (pset_id) *pset_id = set_id;
286  if (pseq_no) *pseq_no = seq_no;
287  if (pstream_id) *pstream_id = stream_id;
288  if (pis_keyframe) *pis_keyframe = is_keyframe;
289  if (ptimestamp) *ptimestamp = timestamp;
290 
291  return consumed + (get_bits_count(&gb) >> 3);
292 }
293 
294 /**< return 0 on packet, no more left, 1 on packet, 1 on partial packet... */
295 static int
297  AVPacket *pkt, uint32_t *timestamp,
298  const uint8_t *buf, int len, uint16_t rtp_seq, int flags)
299 {
300  int seq = 1, res;
301  AVIOContext pb;
302 
303  if (rdt->audio_pkt_cnt == 0) {
304  int pos, rmflags;
305 
306  ffio_init_context(&pb, (uint8_t *)buf, len, 0, NULL, NULL, NULL, NULL);
307  rmflags = (flags & RTP_FLAG_KEY) ? 2 : 0;
308  res = ff_rm_parse_packet (rdt->rmctx, &pb, st, rdt->rmst[st->index], len, pkt,
309  &seq, rmflags, *timestamp);
310  pos = avio_tell(&pb);
311  if (res < 0)
312  return res;
313  if (res > 0) {
314  if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
315  memcpy (rdt->buffer, buf + pos, len - pos);
316  rdt->rmctx->pb = avio_alloc_context (rdt->buffer, len - pos, 0,
317  NULL, NULL, NULL, NULL);
318  }
319  goto get_cache;
320  }
321  } else {
322 get_cache:
323  rdt->audio_pkt_cnt =
324  ff_rm_retrieve_cache (rdt->rmctx, rdt->rmctx->pb,
325  st, rdt->rmst[st->index], pkt);
326  if (rdt->audio_pkt_cnt == 0 &&
328  avio_context_free(&rdt->rmctx->pb);
329  }
330  pkt->stream_index = st->index;
331  pkt->pts = *timestamp;
332 
333  return rdt->audio_pkt_cnt > 0;
334 }
335 
336 int
338  uint8_t **bufptr, int len)
339 {
340  uint8_t *buf = bufptr ? *bufptr : NULL;
341  int seq_no, flags = 0, stream_id, set_id, is_keyframe;
342  uint32_t timestamp;
343  int rv= 0;
344 
345  if (!s->parse_packet)
346  return -1;
347 
348  if (!buf && s->prev_stream_id != -1) {
349  /* return the next packets, if any */
350  timestamp= 0; ///< Should not be used if buf is NULL, but should be set to the timestamp of the packet returned....
352  s->streams[s->prev_stream_id],
353  pkt, &timestamp, NULL, 0, 0, flags);
354  return rv;
355  }
356 
357  if (len < 12)
358  return -1;
359  rv = ff_rdt_parse_header(buf, len, &set_id, &seq_no, &stream_id, &is_keyframe, &timestamp);
360  if (rv < 0)
361  return rv;
362  if (is_keyframe &&
363  (set_id != s->prev_set_id || timestamp != s->prev_timestamp ||
364  stream_id != s->prev_stream_id)) {
365  flags |= RTP_FLAG_KEY;
366  s->prev_set_id = set_id;
367  s->prev_timestamp = timestamp;
368  }
369  s->prev_stream_id = stream_id;
370  buf += rv;
371  len -= rv;
372 
373  if (s->prev_stream_id >= s->n_streams) {
374  s->prev_stream_id = -1;
375  return -1;
376  }
377 
379  s->streams[s->prev_stream_id],
380  pkt, &timestamp, buf, len, 0, flags);
381 
382  return rv;
383 }
384 
385 void
386 ff_rdt_subscribe_rule (char *cmd, int size,
387  int stream_nr, int rule_nr)
388 {
389  av_strlcatf(cmd, size, "stream=%d;rule=%d,stream=%d;rule=%d",
390  stream_nr, rule_nr * 2, stream_nr, rule_nr * 2 + 1);
391 }
392 
393 static unsigned char *
394 rdt_parse_b64buf (unsigned int *target_len, const char *p)
395 {
396  unsigned char *target;
397  int len = strlen(p);
398  if (*p == '\"') {
399  p++;
400  len -= 2; /* skip embracing " at start/end */
401  }
402  *target_len = len * 3 / 4;
403  target = av_mallocz(*target_len + AV_INPUT_BUFFER_PADDING_SIZE);
404  if (!target)
405  return NULL;
406  av_base64_decode(target, p, *target_len);
407  return target;
408 }
409 
410 static int
412  PayloadContext *rdt, const char *line)
413 {
414  AVStream *stream = s->streams[st_index];
415  const char *p = line;
416 
417  if (av_strstart(p, "OpaqueData:buffer;", &p)) {
418  rdt->mlti_data = rdt_parse_b64buf(&rdt->mlti_data_size, p);
419  } else if (av_strstart(p, "StartTime:integer;", &p))
420  stream->first_dts = atoi(p);
421  else if (av_strstart(p, "ASMRuleBook:string;", &p)) {
422  int n, first = -1;
423 
424  for (n = 0; n < s->nb_streams; n++)
425  if (s->streams[n]->id == stream->id) {
426  int count = s->streams[n]->index + 1, err;
427  if (first == -1) first = n;
428  if (rdt->nb_rmst < count) {
429  if ((err = av_reallocp(&rdt->rmst,
430  count * sizeof(*rdt->rmst))) < 0) {
431  rdt->nb_rmst = 0;
432  return err;
433  }
434  memset(rdt->rmst + rdt->nb_rmst, 0,
435  (count - rdt->nb_rmst) * sizeof(*rdt->rmst));
436  rdt->nb_rmst = count;
437  }
438  rdt->rmst[s->streams[n]->index] = ff_rm_alloc_rmstream();
439  if (!rdt->rmst[s->streams[n]->index])
440  return AVERROR(ENOMEM);
441  rdt_load_mdpr(rdt, s->streams[n], (n - first) * 2);
442  }
443  }
444 
445  return 0;
446 }
447 
448 static void
449 real_parse_asm_rule(AVStream *st, const char *p, const char *end)
450 {
451  do {
452  /* can be either averagebandwidth= or AverageBandwidth= */
453  if (sscanf(p, " %*1[Aa]verage%*1[Bb]andwidth=%"SCNd64, &st->codecpar->bit_rate) == 1)
454  break;
455  if (!(p = strchr(p, ',')) || p > end)
456  p = end;
457  p++;
458  } while (p < end);
459 }
460 
461 static AVStream *
463 {
464  AVStream *st;
465 
466  if (!(st = avformat_new_stream(s, NULL)))
467  return NULL;
468  st->id = orig_st->id;
469  st->codecpar->codec_type = orig_st->codecpar->codec_type;
470  st->first_dts = orig_st->first_dts;
471 
472  return st;
473 }
474 
475 static void
477  const char *p)
478 {
479  const char *end;
480  int n_rules = 0, odd = 0;
481  AVStream *st;
482 
483  /**
484  * The ASMRuleBook contains a list of comma-separated strings per rule,
485  * and each rule is separated by a ;. The last one also has a ; at the
486  * end so we can use it as delimiter.
487  * Every rule occurs twice, once for when the RTSP packet header marker
488  * is set and once for if it isn't. We only read the first because we
489  * don't care much (that's what the "odd" variable is for).
490  * Each rule contains a set of one or more statements, optionally
491  * preceded by a single condition. If there's a condition, the rule
492  * starts with a '#'. Multiple conditions are merged between brackets,
493  * so there are never multiple conditions spread out over separate
494  * statements. Generally, these conditions are bitrate limits (min/max)
495  * for multi-bitrate streams.
496  */
497  if (*p == '\"') p++;
498  while (1) {
499  if (!(end = strchr(p, ';')))
500  break;
501  if (!odd && end != p) {
502  if (n_rules > 0)
503  st = add_dstream(s, orig_st);
504  else
505  st = orig_st;
506  if (!st)
507  break;
508  real_parse_asm_rule(st, p, end);
509  n_rules++;
510  }
511  p = end + 1;
512  odd ^= 1;
513  }
514 }
515 
516 void
518  const char *line)
519 {
520  const char *p = line;
521 
522  if (av_strstart(p, "ASMRuleBook:string;", &p))
523  real_parse_asm_rulebook(s, s->streams[stream_index], p);
524 }
525 
526 
527 
528 static av_cold int rdt_init(AVFormatContext *s, int st_index, PayloadContext *rdt)
529 {
530  int ret;
531 
532  rdt->rmctx = avformat_alloc_context();
533  if (!rdt->rmctx)
534  return AVERROR(ENOMEM);
535 
536  if ((ret = ff_copy_whiteblacklists(rdt->rmctx, s)) < 0)
537  return ret;
538 
539  return avformat_open_input(&rdt->rmctx, "", &ff_rdt_demuxer, NULL);
540 }
541 
542 static void
544 {
545  int i;
546 
547  for (i = 0; i < rdt->nb_rmst; i++)
548  if (rdt->rmst[i]) {
549  ff_rm_free_rmstream(rdt->rmst[i]);
550  av_freep(&rdt->rmst[i]);
551  }
552  if (rdt->rmctx)
554  av_freep(&rdt->mlti_data);
555  av_freep(&rdt->rmst);
556 }
557 
558 #define RDT_HANDLER(n, s, t) \
559 RTPDynamicProtocolHandler ff_rdt_ ## n ## _handler = { \
560  .enc_name = s, \
561  .codec_type = t, \
562  .codec_id = AV_CODEC_ID_NONE, \
563  .priv_data_size = sizeof(PayloadContext), \
564  .init = rdt_init, \
565  .parse_sdp_a_line = rdt_parse_sdp_line, \
566  .close = rdt_close_context, \
567  .parse_packet = rdt_parse_packet \
568 }
569 
570 RDT_HANDLER(live_video, "x-pn-multirate-realvideo-live", AVMEDIA_TYPE_VIDEO);
571 RDT_HANDLER(live_audio, "x-pn-multirate-realaudio-live", AVMEDIA_TYPE_AUDIO);
572 RDT_HANDLER(video, "x-pn-realvideo", AVMEDIA_TYPE_VIDEO);
573 RDT_HANDLER(audio, "x-pn-realaudio", AVMEDIA_TYPE_AUDIO);
574 
static void real_parse_asm_rulebook(AVFormatContext *s, AVStream *orig_st, const char *p)
Definition: rdt.c:476
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: avformat.h:1078
#define NULL
Definition: coverity.c:32
int n_streams
streams with identical content in this set
Definition: rdt.c:47
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int size
#define RTP_MAX_PACKET_LENGTH
Definition: rtpdec.h:36
static int is_keyframe(NalUnitType naltype)
Definition: libx265.c:60
RMStream * ff_rm_alloc_rmstream(void)
Definition: rmdec.c:107
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:159
RTP/JPEG specific private data.
Definition: rdt.c:83
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt, uint8_t **bufptr, int len)
Parse RDT-style packet data (header + media data).
Definition: rdt.c:337
int index
stream index in AVFormatContext
Definition: avformat.h:877
Definition: rmdec.c:43
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:241
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:536
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:763
void ff_rdt_subscribe_rule(char *cmd, int size, int stream_nr, int rule_nr)
Add subscription information to Subscribe parameter string.
Definition: rdt.c:386
static int rdt_parse_sdp_line(AVFormatContext *s, int st_index, PayloadContext *rdt, const char *line)
Definition: rdt.c:411
Format I/O context.
Definition: avformat.h:1351
int prev_set_id
Definition: rdt.c:51
static char buffer[20]
Definition: seek.c:32
uint8_t
#define av_cold
Definition: attributes.h:88
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:778
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:92
int id
Format-specific stream ID.
Definition: avformat.h:883
int ff_rm_parse_packet(AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *rst, int len, AVPacket *pkt, int *seq, int flags, int64_t ts)
Parse one rm-stream packet from the input bytestream.
Definition: rmdec.c:898
static void handler(vbi_event *ev, void *user_data)
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4526
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:144
AVStream ** streams
Each RDT stream-set (represented by one RTSPStream) can contain multiple streams (of the same content...
Definition: rdt.c:46
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
uint32_t tag
Definition: movenc.c:1532
bitstream reader API header.
static int rdt_load_mdpr(PayloadContext *rdt, AVStream *st, int rule_nr)
Definition: rdt.c:132
void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len)
Hash an array of data.
Definition: md5.c:208
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
AVFormatContext * rmctx
Definition: rdt.c:84
static void rdt_close_context(PayloadContext *rdt)
Definition: rdt.c:543
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
void ff_rdt_parse_close(RDTDemuxContext *s)
Definition: rdt.c:78
AVIOContext * avio_alloc_context(unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Allocate and initialize an AVIOContext for buffered I/O.
Definition: aviobuf.c:126
int ff_rm_read_mdpr_codecdata(AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *rst, unsigned int codec_data_size, const uint8_t *mime)
Read the MDPR chunk, which contains stream-specific codec initialization parameters.
Definition: rmdec.c:317
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
int audio_pkt_cnt
remaining audio packets in rmdec
Definition: rdt.c:90
#define AV_RB16
Definition: intreadwrite.h:53
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:747
#define AVERROR(e)
Definition: error.h:43
#define XOR_TABLE_SIZE
unsigned int pos
Definition: spdifenc.c:412
int prev_stream_id
Definition: rdt.c:51
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
Definition: graph2dot.c:48
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
char buffer[RTP_MAX_PACKET_LENGTH+AV_INPUT_BUFFER_PADDING_SIZE]
Definition: rdt.c:89
DynamicPayloadPacketHandlerProc parse_packet
Parse handler for this dynamic packet.
Definition: rtpdec.h:135
uint8_t * mlti_data
Definition: rdt.c:87
AVFormatContext * ic
the containing (RTSP) demux context
Definition: rdt.c:40
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
int(* DynamicPayloadPacketHandlerProc)(AVFormatContext *ctx, PayloadContext *s, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, uint16_t seq, int flags)
Packet parsing for "private" payloads in the RTP specs.
Definition: rtpdec.h:108
static av_cold int rdt_init(AVFormatContext *s, int st_index, PayloadContext *rdt)
Definition: rdt.c:528
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
uint32_t prev_timestamp
Definition: rdt.c:50
RDTDemuxContext * ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx, void *priv_data, const RTPDynamicProtocolHandler *handler)
Allocate and init the RDT parsing context.
Definition: rdt.c:55
int ff_rdt_parse_header(const uint8_t *buf, int len, int *pset_id, int *pseq_no, int *pstream_id, int *pis_keyframe, uint32_t *ptimestamp)
Actual data handling.
Definition: rdt.c:190
Stream structure.
Definition: avformat.h:876
DynamicPayloadPacketHandlerProc parse_packet
Definition: rdt.c:49
int av_reallocp(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory through a pointer to a pointer.
Definition: mem.c:161
int ff_rm_retrieve_cache(AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *rst, AVPacket *pkt)
Retrieve one cached packet from the rm-context.
Definition: rmdec.c:986
#define RTP_FLAG_KEY
RTP packet contains a keyframe.
Definition: rtpdec.h:92
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
static int rdt_parse_packet(AVFormatContext *ctx, PayloadContext *rdt, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, uint16_t rtp_seq, int flags)
Definition: rdt.c:296
int nb_rmst
Definition: rdt.c:85
static unsigned char * rdt_parse_b64buf(unsigned int *target_len, const char *p)
Definition: rdt.c:394
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
void ff_real_parse_sdp_a_line(AVFormatContext *s, int stream_index, const char *line)
Parse a server-related SDP line.
Definition: rdt.c:517
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:101
void * dynamic_protocol_context
Definition: rdt.c:48
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
#define flags(name, subs,...)
Definition: cbs_av1.c:576
RMStream ** rmst
Definition: rdt.c:86
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
Main libavformat public API header.
int ffio_init_context(AVIOContext *s, unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Definition: aviobuf.c:76
static void real_parse_asm_rule(AVStream *st, const char *p, const char *end)
Definition: rdt.c:449
void avio_context_free(AVIOContext **s)
Free the supplied IO context and everything associated with it.
Definition: aviobuf.c:143
void ff_rdt_calc_response_and_checksum(char response[41], char chksum[9], const char *challenge)
Calculate the response (RealChallenge2 in the RTSP header) to the challenge (RealChallenge1 in the RT...
Definition: rdt.c:94
void ff_rm_free_rmstream(RMStream *rms)
Definition: rmdec.c:116
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4498
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:215
static AVStream * add_dstream(AVFormatContext *s, AVStream *orig_st)
Definition: rdt.c:462
#define av_free(p)
int len
unsigned int mlti_data_size
Definition: rdt.c:88
int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
Decode a base64-encoded string.
Definition: base64.c:79
AVInputFormat ff_rdt_demuxer
Definition: rmdec.c:1171
Public header for MD5 hash function implementation.
#define av_freep(p)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int stream_index
Definition: packet.h:357
#define MKTAG(a, b, c, d)
Definition: common.h:406
#define RDT_HANDLER(n, s, t)
Definition: rdt.c:558
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:4899
This structure stores compressed data.
Definition: packet.h:332
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:348