FFmpeg
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 "libavutil/mem.h"
31 #include "demux.h"
32 #include "rtpdec.h"
33 #include "rdt.h"
34 #include "libavutil/base64.h"
35 #include "libavutil/md5.h"
36 #include "rm.h"
37 #include "internal.h"
38 #include "avio_internal.h"
39 #include "libavcodec/get_bits.h"
40 
42  AVFormatContext *ic; /**< the containing (RTSP) demux context */
43  /** Each RDT stream-set (represented by one RTSPStream) can contain
44  * multiple streams (of the same content, but with possibly different
45  * codecs/bitrates). Each such stream is represented by one AVStream
46  * in the AVFormatContext, and this variable points to the offset in
47  * that array such that the first is the first stream of this set. */
49  int n_streams; /**< streams with identical content in this set */
52  uint32_t prev_timestamp;
54 };
55 
57 ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx,
58  void *priv_data, const RTPDynamicProtocolHandler *handler)
59 {
61  if (!s)
62  return NULL;
63 
64  s->ic = ic;
65  s->streams = &ic->streams[first_stream_of_set_idx];
66  do {
67  s->n_streams++;
68  } while (first_stream_of_set_idx + s->n_streams < ic->nb_streams &&
69  s->streams[s->n_streams]->id == s->streams[0]->id);
70  s->prev_set_id = -1;
71  s->prev_stream_id = -1;
72  s->prev_timestamp = -1;
73  s->parse_packet = handler ? handler->parse_packet : NULL;
74  s->dynamic_protocol_context = priv_data;
75 
76  return s;
77 }
78 
79 void
81 {
82  av_free(s);
83 }
84 
87  int nb_rmst;
89  uint8_t *mlti_data;
90  unsigned int mlti_data_size;
92  int audio_pkt_cnt; /**< remaining audio packets in rmdec */
93 };
94 
95 void
96 ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
97  const char *challenge)
98 {
99  int ch_len = strlen (challenge), i;
100  unsigned char zres[16],
101  buf[64] = { 0xa1, 0xe9, 0x14, 0x9d, 0x0e, 0x6b, 0x3b, 0x59 };
102 #define XOR_TABLE_SIZE 37
103  static const unsigned char xor_table[XOR_TABLE_SIZE] = {
104  0x05, 0x18, 0x74, 0xd0, 0x0d, 0x09, 0x02, 0x53,
105  0xc0, 0x01, 0x05, 0x05, 0x67, 0x03, 0x19, 0x70,
106  0x08, 0x27, 0x66, 0x10, 0x10, 0x72, 0x08, 0x09,
107  0x63, 0x11, 0x03, 0x71, 0x08, 0x08, 0x70, 0x02,
108  0x10, 0x57, 0x05, 0x18, 0x54 };
109 
110  /* some (length) checks */
111  if (ch_len == 40) /* what a hack... */
112  ch_len = 32;
113  else if (ch_len > 56)
114  ch_len = 56;
115  memcpy(buf + 8, challenge, ch_len);
116 
117  /* xor challenge bytewise with xor_table */
118  for (i = 0; i < XOR_TABLE_SIZE; i++)
119  buf[8 + i] ^= xor_table[i];
120 
121  av_md5_sum(zres, buf, 64);
122  ff_data_to_hex(response, zres, 16, 1);
123 
124  /* add tail */
125  strcpy (response + 32, "01d0a8e3");
126 
127  /* calculate checksum */
128  for (i = 0; i < 8; i++)
129  chksum[i] = response[i * 4];
130  chksum[8] = 0;
131 }
132 
133 static int
134 rdt_load_mdpr (PayloadContext *rdt, AVStream *st, int rule_nr)
135 {
136  FFIOContext pb0;
137  AVIOContext *const pb = &pb0.pub;
138  unsigned int size;
139  uint32_t tag;
140 
141  /**
142  * Layout of the MLTI chunk:
143  * 4: MLTI
144  * 2: number of streams
145  * Then for each stream ([number_of_streams] times):
146  * 2: mdpr index
147  * 2: number of mdpr chunks
148  * Then for each mdpr chunk ([number_of_mdpr_chunks] times):
149  * 4: size
150  * [size]: data
151  * we skip MDPR chunks until we reach the one of the stream
152  * we're interested in, and forward that ([size]+[data]) to
153  * the RM demuxer to parse the stream-specific header data.
154  */
155  if (!rdt->mlti_data)
156  return -1;
158  tag = avio_rl32(pb);
159  if (tag == MKTAG('M', 'L', 'T', 'I')) {
160  int num, chunk_nr;
161 
162  /* read index of MDPR chunk numbers */
163  num = avio_rb16(pb);
164  if (rule_nr < 0 || rule_nr >= num)
165  return -1;
166  avio_skip(pb, rule_nr * 2);
167  chunk_nr = avio_rb16(pb);
168  avio_skip(pb, (num - 1 - rule_nr) * 2);
169 
170  /* read MDPR chunks */
171  num = avio_rb16(pb);
172  if (chunk_nr >= num)
173  return -1;
174  while (chunk_nr--)
175  avio_skip(pb, avio_rb32(pb));
176  size = avio_rb32(pb);
177  } else {
178  size = rdt->mlti_data_size;
179  avio_seek(pb, 0, SEEK_SET);
180  }
181  if (ff_rm_read_mdpr_codecdata(rdt->rmctx, pb, st, rdt->rmst[st->index], size, NULL) < 0)
182  return -1;
183 
184  return 0;
185 }
186 
187 /**
188  * Actual data handling.
189  */
190 
191 int
192 ff_rdt_parse_header(const uint8_t *buf, int len,
193  int *pset_id, int *pseq_no, int *pstream_id,
194  int *pis_keyframe, uint32_t *ptimestamp)
195 {
196  GetBitContext gb;
197  int consumed = 0, set_id, seq_no, stream_id, is_keyframe,
198  len_included, need_reliable;
199  uint32_t timestamp;
200 
201  /* skip status packets */
202  while (len >= 5 && buf[1] == 0xFF /* status packet */) {
203  int pkt_len;
204 
205  if (!(buf[0] & 0x80))
206  return -1; /* not followed by a data packet */
207 
208  pkt_len = AV_RB16(buf+3);
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 
302  if (rdt->audio_pkt_cnt == 0) {
303  FFIOContext pb;
304  int pos, rmflags;
305 
306  ffio_init_read_context(&pb, buf, len);
307  rmflags = (flags & RTP_FLAG_KEY) ? 2 : 0;
308  res = ff_rm_parse_packet(rdt->rmctx, &pb.pub, st, rdt->rmst[st->index],
309  len, pkt, &seq, rmflags, *timestamp);
310  pos = avio_tell(&pb.pub);
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....
351  rv= s->parse_packet(s->ic, s->dynamic_protocol_context,
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 
378  rv = s->parse_packet(s->ic, s->dynamic_protocol_context,
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  ffstream(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  ffstream(st)->first_dts = ffstream(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.p, 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 const 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 
ff_rdt_subscribe_rule
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
rdt_parse_b64buf
static unsigned char * rdt_parse_b64buf(unsigned int *target_len, const char *p)
Definition: rdt.c:394
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
PayloadContext::mlti_data
uint8_t * mlti_data
Definition: rdt.c:89
FFStream::first_dts
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: internal.h:409
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
avio_context_free
void avio_context_free(AVIOContext **s)
Free the supplied IO context and everything associated with it.
Definition: aviobuf.c:126
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:421
PayloadContext::buffer
char buffer[RTP_MAX_PACKET_LENGTH+AV_INPUT_BUFFER_PADDING_SIZE]
Definition: rdt.c:91
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:266
PayloadContext::rmst
RMStream ** rmst
Definition: rdt.c:88
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1323
RDT_HANDLER
#define RDT_HANDLER(n, s, t)
Definition: rdt.c:558
ff_rm_retrieve_cache
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
avio_alloc_context
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, const 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:109
RDTDemuxContext::prev_set_id
int prev_set_id
Definition: rdt.c:53
ff_rdt_calc_response_and_checksum
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:96
ffio_init_read_context
void ffio_init_read_context(FFIOContext *s, const uint8_t *buffer, int buffer_size)
Wrap a buffer in an AVIOContext for reading.
Definition: aviobuf.c:99
av_strlcatf
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:103
FFIOContext
Definition: avio_internal.h:28
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:514
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:381
avformat_close_input
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: demux.c:363
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:417
GetBitContext
Definition: get_bits.h:108
ff_rdt_parse_packet
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
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:494
RMStream
Definition: rmdec.c:44
RTP_FLAG_KEY
#define RTP_FLAG_KEY
RTP packet contains a keyframe.
Definition: rtpdec.h:93
ff_data_to_hex
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Write hexadecimal string corresponding to given binary data.
Definition: utils.c:443
ff_rdt_parse_close
void ff_rdt_parse_close(RDTDemuxContext *s)
Definition: rdt.c:80
first
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But first
Definition: rate_distortion.txt:12
ff_rdt_parse_header
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)
Parse RDT-style packet header.
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:761
pkt
AVPacket * pkt
Definition: movenc.c:60
av_cold
#define av_cold
Definition: attributes.h:90
avformat_open_input
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: demux.c:215
RDTDemuxContext
Definition: rdt.c:41
rdt_parse_sdp_line
static int rdt_parse_sdp_line(AVFormatContext *s, int st_index, PayloadContext *rdt, const char *line)
Definition: rdt.c:411
real_parse_asm_rulebook
static void real_parse_asm_rulebook(AVFormatContext *s, AVStream *orig_st, const char *p)
Definition: rdt.c:476
s
#define s(width, name)
Definition: cbs_vp9.c:198
RDTDemuxContext::prev_stream_id
int prev_stream_id
Definition: rdt.c:53
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
ctx
AVFormatContext * ctx
Definition: movenc.c:49
get_bits.h
handler
static void handler(vbi_event *ev, void *user_data)
Definition: libzvbi-teletextdec.c:508
RDTDemuxContext::ic
AVFormatContext * ic
the containing (RTSP) demux context
Definition: rdt.c:42
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
PayloadContext::mlti_data_size
unsigned int mlti_data_size
Definition: rdt.c:90
NULL
#define NULL
Definition: coverity.c:32
ff_copy_whiteblacklists
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: avformat.c:898
RDTDemuxContext::dynamic_protocol_context
void * dynamic_protocol_context
Definition: rdt.c:50
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:388
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1297
av_base64_decode
int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
Decode a base64-encoded string.
Definition: base64.c:81
base64.h
rtpdec.h
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1311
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:442
XOR_TABLE_SIZE
#define XOR_TABLE_SIZE
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
RDTDemuxContext::streams
AVStream ** streams
Each RDT stream-set (represented by one RTSPStream) can contain multiple streams (of the same content...
Definition: rdt.c:48
avformat_alloc_context
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:161
rdt_close_context
static void rdt_close_context(PayloadContext *rdt)
Definition: rdt.c:543
FFIOContext::pub
AVIOContext pub
Definition: avio_internal.h:29
size
int size
Definition: twinvq_data.h:10344
av_reallocp
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:188
ff_rdt_demuxer
const struct FFInputFormat ff_rdt_demuxer
Definition: rmdec.c:1162
av_md5_sum
void av_md5_sum(uint8_t *dst, const uint8_t *src, size_t len)
Hash an array of data.
Definition: md5.c:203
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:41
line
Definition: graph2dot.c:48
ff_rdt_parse_open
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:57
av_strstart
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:36
ff_real_parse_sdp_a_line
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
ff_rm_parse_packet
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:888
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:517
avio_internal.h
add_dstream
static AVStream * add_dstream(AVFormatContext *s, AVStream *orig_st)
Definition: rdt.c:462
RDTDemuxContext::prev_timestamp
uint32_t prev_timestamp
Definition: rdt.c:52
md5.h
ff_rm_alloc_rmstream
RMStream * ff_rm_alloc_rmstream(void)
Definition: rmdec.c:106
PayloadContext::nb_rmst
int nb_rmst
Definition: rdt.c:87
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:256
demux.h
len
int len
Definition: vorbis_enc_data.h:426
RDTDemuxContext::n_streams
int n_streams
streams with identical content in this set
Definition: rdt.c:49
DynamicPayloadPacketHandlerProc
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:109
tag
uint32_t tag
Definition: movenc.c:1851
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:755
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:743
PayloadContext::rmctx
AVFormatContext * rmctx
Definition: rdt.c:86
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
real_parse_asm_rule
static void real_parse_asm_rule(AVStream *st, const char *p, const char *end)
Definition: rdt.c:449
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:746
pos
unsigned int pos
Definition: spdifenc.c:414
avformat.h
RDTDemuxContext::parse_packet
DynamicPayloadPacketHandlerProc parse_packet
Definition: rdt.c:51
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
RTP_MAX_PACKET_LENGTH
#define RTP_MAX_PACKET_LENGTH
Definition: rtpdec.h:37
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:749
rdt_parse_packet
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
video
A Quick Description Of Rate Distortion Theory We want to encode a video
Definition: rate_distortion.txt:3
rdt_init
static av_cold int rdt_init(AVFormatContext *s, int st_index, PayloadContext *rdt)
Definition: rdt.c:528
AVPacket::stream_index
int stream_index
Definition: packet.h:526
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:318
ff_rm_read_mdpr_codecdata
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:315
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
rdt.h
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:501
PayloadContext::audio_pkt_cnt
int audio_pkt_cnt
remaining audio packets in rmdec
Definition: rdt.c:92
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:97
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
rm.h
ff_rm_free_rmstream
void ff_rm_free_rmstream(RMStream *rms)
Definition: rmdec.c:115
avstring.h
PayloadContext
RTP/JPEG specific private data.
Definition: rdt.c:85
line
The official guide to swscale for confused that consecutive non overlapping rectangles of slice_bottom special converter These generally are unscaled converters of common like for each output line the vertical scaler pulls lines from a ring buffer When the ring buffer does not contain the wanted line
Definition: swscale.txt:40
RTPDynamicProtocolHandler
Definition: rtpdec.h:116
is_keyframe
static int is_keyframe(NalUnitType naltype)
Definition: libx265.c:86
rdt_load_mdpr
static int rdt_load_mdpr(PayloadContext *rdt, AVStream *st, int rule_nr)
Definition: rdt.c:134
AV_RB16
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:98