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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 identifical 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, 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  buf += pkt_len;
208  len -= pkt_len;
209  consumed += pkt_len;
210  }
211  if (len < 16)
212  return -1;
213  /**
214  * Layout of the header (in bits):
215  * 1: len_included
216  * Flag indicating whether this header includes a length field;
217  * this can be used to concatenate multiple RDT packets in a
218  * single UDP/TCP data frame and is used to precede RDT data
219  * by stream status packets
220  * 1: need_reliable
221  * Flag indicating whether this header includes a "reliable
222  * sequence number"; these are apparently sequence numbers of
223  * data packets alone. For data packets, this flag is always
224  * set, according to the Real documentation [1]
225  * 5: set_id
226  * ID of a set of streams of identical content, possibly with
227  * different codecs or bitrates
228  * 1: is_reliable
229  * Flag set for certain streams deemed less tolerable for packet
230  * loss
231  * 16: seq_no
232  * Packet sequence number; if >=0xFF00, this is a non-data packet
233  * containing stream status info, the second byte indicates the
234  * type of status packet (see wireshark docs / source code [2])
235  * if (len_included) {
236  * 16: packet_len
237  * } else {
238  * packet_len = remainder of UDP/TCP frame
239  * }
240  * 1: is_back_to_back
241  * Back-to-Back flag; used for timing, set for one in every 10
242  * packets, according to the Real documentation [1]
243  * 1: is_slow_data
244  * Slow-data flag; currently unused, according to Real docs [1]
245  * 5: stream_id
246  * ID of the stream within this particular set of streams
247  * 1: is_no_keyframe
248  * Non-keyframe flag (unset if packet belongs to a keyframe)
249  * 32: timestamp (PTS)
250  * if (set_id == 0x1F) {
251  * 16: set_id (extended set-of-streams ID; see set_id)
252  * }
253  * if (need_reliable) {
254  * 16: reliable_seq_no
255  * Reliable sequence number (see need_reliable)
256  * }
257  * if (stream_id == 0x3F) {
258  * 16: stream_id (extended stream ID; see stream_id)
259  * }
260  * [1] https://protocol.helixcommunity.org/files/2005/devdocs/RDT_Feature_Level_20.txt
261  * [2] http://www.wireshark.org/docs/dfref/r/rdt.html and
262  * http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-rdt.c
263  */
264  init_get_bits(&gb, buf, len << 3);
265  len_included = get_bits1(&gb);
266  need_reliable = get_bits1(&gb);
267  set_id = get_bits(&gb, 5);
268  skip_bits(&gb, 1);
269  seq_no = get_bits(&gb, 16);
270  if (len_included)
271  skip_bits(&gb, 16);
272  skip_bits(&gb, 2);
273  stream_id = get_bits(&gb, 5);
274  is_keyframe = !get_bits1(&gb);
275  timestamp = get_bits_long(&gb, 32);
276  if (set_id == 0x1f)
277  set_id = get_bits(&gb, 16);
278  if (need_reliable)
279  skip_bits(&gb, 16);
280  if (stream_id == 0x1f)
281  stream_id = get_bits(&gb, 16);
282 
283  if (pset_id) *pset_id = set_id;
284  if (pseq_no) *pseq_no = seq_no;
285  if (pstream_id) *pstream_id = stream_id;
286  if (pis_keyframe) *pis_keyframe = is_keyframe;
287  if (ptimestamp) *ptimestamp = timestamp;
288 
289  return consumed + (get_bits_count(&gb) >> 3);
290 }
291 
292 /**< return 0 on packet, no more left, 1 on packet, 1 on partial packet... */
293 static int
295  AVPacket *pkt, uint32_t *timestamp,
296  const uint8_t *buf, int len, uint16_t rtp_seq, int flags)
297 {
298  int seq = 1, res;
299  AVIOContext pb;
300 
301  if (rdt->audio_pkt_cnt == 0) {
302  int pos, rmflags;
303 
304  ffio_init_context(&pb, (uint8_t *)buf, len, 0, NULL, NULL, NULL, NULL);
305  rmflags = (flags & RTP_FLAG_KEY) ? 2 : 0;
306  res = ff_rm_parse_packet (rdt->rmctx, &pb, st, rdt->rmst[st->index], len, pkt,
307  &seq, rmflags, *timestamp);
308  pos = avio_tell(&pb);
309  if (res < 0)
310  return res;
311  if (res > 0) {
312  if (st->codec->codec_id == AV_CODEC_ID_AAC) {
313  memcpy (rdt->buffer, buf + pos, len - pos);
314  rdt->rmctx->pb = avio_alloc_context (rdt->buffer, len - pos, 0,
315  NULL, NULL, NULL, NULL);
316  }
317  goto get_cache;
318  }
319  } else {
320 get_cache:
321  rdt->audio_pkt_cnt =
322  ff_rm_retrieve_cache (rdt->rmctx, rdt->rmctx->pb,
323  st, rdt->rmst[st->index], pkt);
324  if (rdt->audio_pkt_cnt == 0 &&
326  av_freep(&rdt->rmctx->pb);
327  }
328  pkt->stream_index = st->index;
329  pkt->pts = *timestamp;
330 
331  return rdt->audio_pkt_cnt > 0;
332 }
333 
334 int
336  uint8_t **bufptr, int len)
337 {
338  uint8_t *buf = bufptr ? *bufptr : NULL;
339  int seq_no, flags = 0, stream_id, set_id, is_keyframe;
340  uint32_t timestamp;
341  int rv= 0;
342 
343  if (!s->parse_packet)
344  return -1;
345 
346  if (!buf && s->prev_stream_id != -1) {
347  /* return the next packets, if any */
348  timestamp= 0; ///< Should not be used if buf is NULL, but should be set to the timestamp of the packet returned....
350  s->streams[s->prev_stream_id],
351  pkt, &timestamp, NULL, 0, 0, flags);
352  return rv;
353  }
354 
355  if (len < 12)
356  return -1;
357  rv = ff_rdt_parse_header(buf, len, &set_id, &seq_no, &stream_id, &is_keyframe, &timestamp);
358  if (rv < 0)
359  return rv;
360  if (is_keyframe &&
361  (set_id != s->prev_set_id || timestamp != s->prev_timestamp ||
362  stream_id != s->prev_stream_id)) {
363  flags |= RTP_FLAG_KEY;
364  s->prev_set_id = set_id;
365  s->prev_timestamp = timestamp;
366  }
367  s->prev_stream_id = stream_id;
368  buf += rv;
369  len -= rv;
370 
371  if (s->prev_stream_id >= s->n_streams) {
372  s->prev_stream_id = -1;
373  return -1;
374  }
375 
377  s->streams[s->prev_stream_id],
378  pkt, &timestamp, buf, len, 0, flags);
379 
380  return rv;
381 }
382 
383 void
384 ff_rdt_subscribe_rule (char *cmd, int size,
385  int stream_nr, int rule_nr)
386 {
387  av_strlcatf(cmd, size, "stream=%d;rule=%d,stream=%d;rule=%d",
388  stream_nr, rule_nr * 2, stream_nr, rule_nr * 2 + 1);
389 }
390 
391 static unsigned char *
392 rdt_parse_b64buf (unsigned int *target_len, const char *p)
393 {
394  unsigned char *target;
395  int len = strlen(p);
396  if (*p == '\"') {
397  p++;
398  len -= 2; /* skip embracing " at start/end */
399  }
400  *target_len = len * 3 / 4;
401  target = av_mallocz(*target_len + AV_INPUT_BUFFER_PADDING_SIZE);
402  if (!target)
403  return NULL;
404  av_base64_decode(target, p, *target_len);
405  return target;
406 }
407 
408 static int
410  PayloadContext *rdt, const char *line)
411 {
412  AVStream *stream = s->streams[st_index];
413  const char *p = line;
414 
415  if (av_strstart(p, "OpaqueData:buffer;", &p)) {
416  rdt->mlti_data = rdt_parse_b64buf(&rdt->mlti_data_size, p);
417  } else if (av_strstart(p, "StartTime:integer;", &p))
418  stream->first_dts = atoi(p);
419  else if (av_strstart(p, "ASMRuleBook:string;", &p)) {
420  int n, first = -1;
421 
422  for (n = 0; n < s->nb_streams; n++)
423  if (s->streams[n]->id == stream->id) {
424  int count = s->streams[n]->index + 1, err;
425  if (first == -1) first = n;
426  if (rdt->nb_rmst < count) {
427  if ((err = av_reallocp(&rdt->rmst,
428  count * sizeof(*rdt->rmst))) < 0) {
429  rdt->nb_rmst = 0;
430  return err;
431  }
432  memset(rdt->rmst + rdt->nb_rmst, 0,
433  (count - rdt->nb_rmst) * sizeof(*rdt->rmst));
434  rdt->nb_rmst = count;
435  }
436  rdt->rmst[s->streams[n]->index] = ff_rm_alloc_rmstream();
437  if (!rdt->rmst[s->streams[n]->index])
438  return AVERROR(ENOMEM);
439  rdt_load_mdpr(rdt, s->streams[n], (n - first) * 2);
440  }
441  }
442 
443  return 0;
444 }
445 
446 static void
447 real_parse_asm_rule(AVStream *st, const char *p, const char *end)
448 {
449  do {
450  /* can be either averagebandwidth= or AverageBandwidth= */
451  if (sscanf(p, " %*1[Aa]verage%*1[Bb]andwidth=%d", &st->codec->bit_rate) == 1)
452  break;
453  if (!(p = strchr(p, ',')) || p > end)
454  p = end;
455  p++;
456  } while (p < end);
457 }
458 
459 static AVStream *
461 {
462  AVStream *st;
463 
464  if (!(st = avformat_new_stream(s, NULL)))
465  return NULL;
466  st->id = orig_st->id;
467  st->codec->codec_type = orig_st->codec->codec_type;
468  st->first_dts = orig_st->first_dts;
469 
470  return st;
471 }
472 
473 static void
475  const char *p)
476 {
477  const char *end;
478  int n_rules = 0, odd = 0;
479  AVStream *st;
480 
481  /**
482  * The ASMRuleBook contains a list of comma-separated strings per rule,
483  * and each rule is separated by a ;. The last one also has a ; at the
484  * end so we can use it as delimiter.
485  * Every rule occurs twice, once for when the RTSP packet header marker
486  * is set and once for if it isn't. We only read the first because we
487  * don't care much (that's what the "odd" variable is for).
488  * Each rule contains a set of one or more statements, optionally
489  * preceded by a single condition. If there's a condition, the rule
490  * starts with a '#'. Multiple conditions are merged between brackets,
491  * so there are never multiple conditions spread out over separate
492  * statements. Generally, these conditions are bitrate limits (min/max)
493  * for multi-bitrate streams.
494  */
495  if (*p == '\"') p++;
496  while (1) {
497  if (!(end = strchr(p, ';')))
498  break;
499  if (!odd && end != p) {
500  if (n_rules > 0)
501  st = add_dstream(s, orig_st);
502  else
503  st = orig_st;
504  if (!st)
505  break;
506  real_parse_asm_rule(st, p, end);
507  n_rules++;
508  }
509  p = end + 1;
510  odd ^= 1;
511  }
512 }
513 
514 void
516  const char *line)
517 {
518  const char *p = line;
519 
520  if (av_strstart(p, "ASMRuleBook:string;", &p))
521  real_parse_asm_rulebook(s, s->streams[stream_index], p);
522 }
523 
524 
525 
526 static av_cold int rdt_init(AVFormatContext *s, int st_index, PayloadContext *rdt)
527 {
528  int ret;
529 
530  rdt->rmctx = avformat_alloc_context();
531  if (!rdt->rmctx)
532  return AVERROR(ENOMEM);
533 
534  if ((ret = ff_copy_whitelists(rdt->rmctx, s)) < 0)
535  return ret;
536 
537  return avformat_open_input(&rdt->rmctx, "", &ff_rdt_demuxer, NULL);
538 }
539 
540 static void
542 {
543  int i;
544 
545  for (i = 0; i < rdt->nb_rmst; i++)
546  if (rdt->rmst[i]) {
547  ff_rm_free_rmstream(rdt->rmst[i]);
548  av_freep(&rdt->rmst[i]);
549  }
550  if (rdt->rmctx)
552  av_freep(&rdt->mlti_data);
553  av_freep(&rdt->rmst);
554 }
555 
556 #define RDT_HANDLER(n, s, t) \
557 static RTPDynamicProtocolHandler rdt_ ## n ## _handler = { \
558  .enc_name = s, \
559  .codec_type = t, \
560  .codec_id = AV_CODEC_ID_NONE, \
561  .priv_data_size = sizeof(PayloadContext), \
562  .init = rdt_init, \
563  .parse_sdp_a_line = rdt_parse_sdp_line, \
564  .close = rdt_close_context, \
565  .parse_packet = rdt_parse_packet \
566 }
567 
568 RDT_HANDLER(live_video, "x-pn-multirate-realvideo-live", AVMEDIA_TYPE_VIDEO);
569 RDT_HANDLER(live_audio, "x-pn-multirate-realaudio-live", AVMEDIA_TYPE_AUDIO);
570 RDT_HANDLER(video, "x-pn-realvideo", AVMEDIA_TYPE_VIDEO);
571 RDT_HANDLER(audio, "x-pn-realaudio", AVMEDIA_TYPE_AUDIO);
572 
574 {
575  ff_register_dynamic_payload_handler(&rdt_video_handler);
576  ff_register_dynamic_payload_handler(&rdt_audio_handler);
577  ff_register_dynamic_payload_handler(&rdt_live_video_handler);
578  ff_register_dynamic_payload_handler(&rdt_live_audio_handler);
579 }
static void real_parse_asm_rulebook(AVFormatContext *s, AVStream *orig_st, const char *p)
Definition: rdt.c:474
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: avformat.h:1018
#define NULL
Definition: coverity.c:32
int n_streams
streams with identifical content in this set
Definition: rdt.c:47
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
#define RTP_MAX_PACKET_LENGTH
Definition: rtpdec.h:36
static int is_keyframe(NalUnitType naltype)
Definition: libx265.c:50
RMStream * ff_rm_alloc_rmstream(void)
Definition: rmdec.c:112
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:405
RTP/JPEG specific private data.
Definition: rdt.c:83
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:335
int index
stream index in AVFormatContext
Definition: avformat.h:843
Definition: rmdec.c:43
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:204
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:277
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:675
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:384
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
static int rdt_parse_sdp_line(AVFormatContext *s, int st_index, PayloadContext *rdt, const char *line)
Definition: rdt.c:409
Format I/O context.
Definition: avformat.h:1273
int prev_set_id
Definition: rdt.c:51
uint8_t
#define av_cold
Definition: attributes.h:74
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:690
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int id
Format-specific stream ID.
Definition: avformat.h:849
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:881
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:3741
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1341
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:111
AVStream ** streams
Each RDT stream-set (represented by one RTSPStream) can contain multiple streams (of the same content...
Definition: rdt.c:46
int av_reallocp(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:187
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
uint32_t tag
Definition: movenc.c:1334
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:198
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:390
AVFormatContext * rmctx
Definition: rdt.c:84
static void rdt_close_context(PayloadContext *rdt)
Definition: rdt.c:541
void ff_register_rdt_dynamic_payload_handlers(void)
Register RDT-related dynamic payload handlers with our cache.
Definition: rdt.c:573
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:112
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:312
int audio_pkt_cnt
remaining audio packets in rmdec
Definition: rdt.c:90
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:659
#define AVERROR(e)
Definition: error.h:43
#define XOR_TABLE_SIZE
int prev_stream_id
Definition: rdt.c:51
Definition: graph2dot.c:48
char buffer[RTP_MAX_PACKET_LENGTH+AV_INPUT_BUFFER_PADDING_SIZE]
Definition: rdt.c:89
GLsizei count
Definition: opengl_enc.c:109
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
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1329
int bit_rate
the average bitrate
Definition: avcodec.h:1566
static av_cold int rdt_init(AVFormatContext *s, int st_index, PayloadContext *rdt)
Definition: rdt.c:526
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
int n
Definition: avisynth_c.h:547
uint32_t prev_timestamp
Definition: rdt.c:50
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:842
DynamicPayloadPacketHandlerProc parse_packet
Definition: rdt.c:49
enum AVMediaType codec_type
Definition: avcodec.h:1509
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:976
#define RTP_FLAG_KEY
RTP packet contains a keyframe.
Definition: rtpdec.h:92
enum AVCodecID codec_id
Definition: avcodec.h:1518
AVIOContext * pb
I/O context.
Definition: avformat.h:1315
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:294
void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler)
Definition: rtpdec.c:67
int nb_rmst
Definition: rdt.c:85
RDTDemuxContext * ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx, void *priv_data, RTPDynamicProtocolHandler *handler)
Allocate and init the RDT parsing context.
Definition: rdt.c:55
void * buf
Definition: avisynth_c.h:553
static unsigned char * rdt_parse_b64buf(unsigned int *target_len, const char *p)
Definition: rdt.c:392
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:297
void ff_real_parse_sdp_a_line(AVFormatContext *s, int stream_index, const char *line)
Parse a server-related SDP line.
Definition: rdt.c:515
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:410
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:337
int ff_copy_whitelists(AVFormatContext *dst, AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:140
static int flags
Definition: cpu.c:47
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:72
static void real_parse_asm_rule(AVStream *st, const char *p, const char *end)
Definition: rdt.c:447
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:121
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:3713
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:635
static AVStream * add_dstream(AVFormatContext *s, AVStream *orig_st)
Definition: rdt.c:460
#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:1156
#define av_freep(p)
int stream_index
Definition: avcodec.h:1424
#define MKTAG(a, b, c, d)
Definition: common.h:315
#define RDT_HANDLER(n, s, t)
Definition: rdt.c:556
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:4026
This structure stores compressed data.
Definition: avcodec.h:1399
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1415
GLuint buffer
Definition: opengl_enc.c:102