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 "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;
87  uint8_t *mlti_data;
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  FFIOContext pb0;
135  AVIOContext *const pb = &pb0.pub;
136  unsigned int size;
137  uint32_t tag;
138 
139  /**
140  * Layout of the MLTI chunk:
141  * 4: MLTI
142  * 2: number of streams
143  * Then for each stream ([number_of_streams] times):
144  * 2: mdpr index
145  * 2: number of mdpr chunks
146  * Then for each mdpr chunk ([number_of_mdpr_chunks] times):
147  * 4: size
148  * [size]: data
149  * we skip MDPR chunks until we reach the one of the stream
150  * we're interested in, and forward that ([size]+[data]) to
151  * the RM demuxer to parse the stream-specific header data.
152  */
153  if (!rdt->mlti_data)
154  return -1;
155  ffio_init_context(&pb0, rdt->mlti_data, rdt->mlti_data_size, 0,
156  NULL, NULL, NULL, NULL);
157  tag = avio_rl32(pb);
158  if (tag == MKTAG('M', 'L', 'T', 'I')) {
159  int num, chunk_nr;
160 
161  /* read index of MDPR chunk numbers */
162  num = avio_rb16(pb);
163  if (rule_nr < 0 || rule_nr >= num)
164  return -1;
165  avio_skip(pb, rule_nr * 2);
166  chunk_nr = avio_rb16(pb);
167  avio_skip(pb, (num - 1 - rule_nr) * 2);
168 
169  /* read MDPR chunks */
170  num = avio_rb16(pb);
171  if (chunk_nr >= num)
172  return -1;
173  while (chunk_nr--)
174  avio_skip(pb, avio_rb32(pb));
175  size = avio_rb32(pb);
176  } else {
177  size = rdt->mlti_data_size;
178  avio_seek(pb, 0, SEEK_SET);
179  }
180  if (ff_rm_read_mdpr_codecdata(rdt->rmctx, pb, st, rdt->rmst[st->index], size, NULL) < 0)
181  return -1;
182 
183  return 0;
184 }
185 
186 /**
187  * Actual data handling.
188  */
189 
190 int
191 ff_rdt_parse_header(const uint8_t *buf, int len,
192  int *pset_id, int *pseq_no, int *pstream_id,
193  int *pis_keyframe, uint32_t *ptimestamp)
194 {
195  GetBitContext gb;
196  int consumed = 0, set_id, seq_no, stream_id, is_keyframe,
197  len_included, need_reliable;
198  uint32_t timestamp;
199 
200  /* skip status packets */
201  while (len >= 5 && buf[1] == 0xFF /* status packet */) {
202  int pkt_len;
203 
204  if (!(buf[0] & 0x80))
205  return -1; /* not followed by a data packet */
206 
207  pkt_len = AV_RB16(buf+3);
208  buf += pkt_len;
209  len -= pkt_len;
210  consumed += pkt_len;
211  }
212  if (len < 16)
213  return -1;
214  /**
215  * Layout of the header (in bits):
216  * 1: len_included
217  * Flag indicating whether this header includes a length field;
218  * this can be used to concatenate multiple RDT packets in a
219  * single UDP/TCP data frame and is used to precede RDT data
220  * by stream status packets
221  * 1: need_reliable
222  * Flag indicating whether this header includes a "reliable
223  * sequence number"; these are apparently sequence numbers of
224  * data packets alone. For data packets, this flag is always
225  * set, according to the Real documentation [1]
226  * 5: set_id
227  * ID of a set of streams of identical content, possibly with
228  * different codecs or bitrates
229  * 1: is_reliable
230  * Flag set for certain streams deemed less tolerable for packet
231  * loss
232  * 16: seq_no
233  * Packet sequence number; if >=0xFF00, this is a non-data packet
234  * containing stream status info, the second byte indicates the
235  * type of status packet (see wireshark docs / source code [2])
236  * if (len_included) {
237  * 16: packet_len
238  * } else {
239  * packet_len = remainder of UDP/TCP frame
240  * }
241  * 1: is_back_to_back
242  * Back-to-Back flag; used for timing, set for one in every 10
243  * packets, according to the Real documentation [1]
244  * 1: is_slow_data
245  * Slow-data flag; currently unused, according to Real docs [1]
246  * 5: stream_id
247  * ID of the stream within this particular set of streams
248  * 1: is_no_keyframe
249  * Non-keyframe flag (unset if packet belongs to a keyframe)
250  * 32: timestamp (PTS)
251  * if (set_id == 0x1F) {
252  * 16: set_id (extended set-of-streams ID; see set_id)
253  * }
254  * if (need_reliable) {
255  * 16: reliable_seq_no
256  * Reliable sequence number (see need_reliable)
257  * }
258  * if (stream_id == 0x3F) {
259  * 16: stream_id (extended stream ID; see stream_id)
260  * }
261  * [1] https://protocol.helixcommunity.org/files/2005/devdocs/RDT_Feature_Level_20.txt
262  * [2] http://www.wireshark.org/docs/dfref/r/rdt.html and
263  * http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-rdt.c
264  */
265  init_get_bits(&gb, buf, len << 3);
266  len_included = get_bits1(&gb);
267  need_reliable = get_bits1(&gb);
268  set_id = get_bits(&gb, 5);
269  skip_bits(&gb, 1);
270  seq_no = get_bits(&gb, 16);
271  if (len_included)
272  skip_bits(&gb, 16);
273  skip_bits(&gb, 2);
274  stream_id = get_bits(&gb, 5);
275  is_keyframe = !get_bits1(&gb);
276  timestamp = get_bits_long(&gb, 32);
277  if (set_id == 0x1f)
278  set_id = get_bits(&gb, 16);
279  if (need_reliable)
280  skip_bits(&gb, 16);
281  if (stream_id == 0x1f)
282  stream_id = get_bits(&gb, 16);
283 
284  if (pset_id) *pset_id = set_id;
285  if (pseq_no) *pseq_no = seq_no;
286  if (pstream_id) *pstream_id = stream_id;
287  if (pis_keyframe) *pis_keyframe = is_keyframe;
288  if (ptimestamp) *ptimestamp = timestamp;
289 
290  return consumed + (get_bits_count(&gb) >> 3);
291 }
292 
293 /**< return 0 on packet, no more left, 1 on packet, 1 on partial packet... */
294 static int
296  AVPacket *pkt, uint32_t *timestamp,
297  const uint8_t *buf, int len, uint16_t rtp_seq, int flags)
298 {
299  int seq = 1, res;
300 
301  if (rdt->audio_pkt_cnt == 0) {
302  FFIOContext pb;
303  int pos, rmflags;
304 
305  ffio_init_context(&pb, (uint8_t *)buf, len, 0, NULL, NULL, NULL, NULL);
306  rmflags = (flags & RTP_FLAG_KEY) ? 2 : 0;
307  res = ff_rm_parse_packet(rdt->rmctx, &pb.pub, st, rdt->rmst[st->index],
308  len, pkt, &seq, rmflags, *timestamp);
309  pos = avio_tell(&pb.pub);
310  if (res < 0)
311  return res;
312  if (res > 0) {
313  if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
314  memcpy (rdt->buffer, buf + pos, len - pos);
315  rdt->rmctx->pb = avio_alloc_context (rdt->buffer, len - pos, 0,
316  NULL, NULL, NULL, NULL);
317  }
318  goto get_cache;
319  }
320  } else {
321 get_cache:
322  rdt->audio_pkt_cnt =
323  ff_rm_retrieve_cache (rdt->rmctx, rdt->rmctx->pb,
324  st, rdt->rmst[st->index], pkt);
325  if (rdt->audio_pkt_cnt == 0 &&
327  avio_context_free(&rdt->rmctx->pb);
328  }
329  pkt->stream_index = st->index;
330  pkt->pts = *timestamp;
331 
332  return rdt->audio_pkt_cnt > 0;
333 }
334 
335 int
337  uint8_t **bufptr, int len)
338 {
339  uint8_t *buf = bufptr ? *bufptr : NULL;
340  int seq_no, flags = 0, stream_id, set_id, is_keyframe;
341  uint32_t timestamp;
342  int rv= 0;
343 
344  if (!s->parse_packet)
345  return -1;
346 
347  if (!buf && s->prev_stream_id != -1) {
348  /* return the next packets, if any */
349  timestamp= 0; ///< Should not be used if buf is NULL, but should be set to the timestamp of the packet returned....
350  rv= s->parse_packet(s->ic, s->dynamic_protocol_context,
351  s->streams[s->prev_stream_id],
352  pkt, &timestamp, NULL, 0, 0, flags);
353  return rv;
354  }
355 
356  if (len < 12)
357  return -1;
358  rv = ff_rdt_parse_header(buf, len, &set_id, &seq_no, &stream_id, &is_keyframe, &timestamp);
359  if (rv < 0)
360  return rv;
361  if (is_keyframe &&
362  (set_id != s->prev_set_id || timestamp != s->prev_timestamp ||
363  stream_id != s->prev_stream_id)) {
364  flags |= RTP_FLAG_KEY;
365  s->prev_set_id = set_id;
366  s->prev_timestamp = timestamp;
367  }
368  s->prev_stream_id = stream_id;
369  buf += rv;
370  len -= rv;
371 
372  if (s->prev_stream_id >= s->n_streams) {
373  s->prev_stream_id = -1;
374  return -1;
375  }
376 
377  rv = s->parse_packet(s->ic, s->dynamic_protocol_context,
378  s->streams[s->prev_stream_id],
379  pkt, &timestamp, buf, len, 0, flags);
380 
381  return rv;
382 }
383 
384 void
385 ff_rdt_subscribe_rule (char *cmd, int size,
386  int stream_nr, int rule_nr)
387 {
388  av_strlcatf(cmd, size, "stream=%d;rule=%d,stream=%d;rule=%d",
389  stream_nr, rule_nr * 2, stream_nr, rule_nr * 2 + 1);
390 }
391 
392 static unsigned char *
393 rdt_parse_b64buf (unsigned int *target_len, const char *p)
394 {
395  unsigned char *target;
396  int len = strlen(p);
397  if (*p == '\"') {
398  p++;
399  len -= 2; /* skip embracing " at start/end */
400  }
401  *target_len = len * 3 / 4;
402  target = av_mallocz(*target_len + AV_INPUT_BUFFER_PADDING_SIZE);
403  if (!target)
404  return NULL;
405  av_base64_decode(target, p, *target_len);
406  return target;
407 }
408 
409 static int
411  PayloadContext *rdt, const char *line)
412 {
413  AVStream *stream = s->streams[st_index];
414  const char *p = line;
415 
416  if (av_strstart(p, "OpaqueData:buffer;", &p)) {
417  rdt->mlti_data = rdt_parse_b64buf(&rdt->mlti_data_size, p);
418  } else if (av_strstart(p, "StartTime:integer;", &p))
419  ffstream(stream)->first_dts = atoi(p);
420  else if (av_strstart(p, "ASMRuleBook:string;", &p)) {
421  int n, first = -1;
422 
423  for (n = 0; n < s->nb_streams; n++)
424  if (s->streams[n]->id == stream->id) {
425  int count = s->streams[n]->index + 1, err;
426  if (first == -1) first = n;
427  if (rdt->nb_rmst < count) {
428  if ((err = av_reallocp(&rdt->rmst,
429  count * sizeof(*rdt->rmst))) < 0) {
430  rdt->nb_rmst = 0;
431  return err;
432  }
433  memset(rdt->rmst + rdt->nb_rmst, 0,
434  (count - rdt->nb_rmst) * sizeof(*rdt->rmst));
435  rdt->nb_rmst = count;
436  }
437  rdt->rmst[s->streams[n]->index] = ff_rm_alloc_rmstream();
438  if (!rdt->rmst[s->streams[n]->index])
439  return AVERROR(ENOMEM);
440  rdt_load_mdpr(rdt, s->streams[n], (n - first) * 2);
441  }
442  }
443 
444  return 0;
445 }
446 
447 static void
448 real_parse_asm_rule(AVStream *st, const char *p, const char *end)
449 {
450  do {
451  /* can be either averagebandwidth= or AverageBandwidth= */
452  if (sscanf(p, " %*1[Aa]verage%*1[Bb]andwidth=%"SCNd64, &st->codecpar->bit_rate) == 1)
453  break;
454  if (!(p = strchr(p, ',')) || p > end)
455  p = end;
456  p++;
457  } while (p < end);
458 }
459 
460 static AVStream *
462 {
463  AVStream *st;
464 
465  if (!(st = avformat_new_stream(s, NULL)))
466  return NULL;
467  st->id = orig_st->id;
468  st->codecpar->codec_type = orig_st->codecpar->codec_type;
469  ffstream(st)->first_dts = ffstream(orig_st)->first_dts;
470 
471  return st;
472 }
473 
474 static void
476  const char *p)
477 {
478  const char *end;
479  int n_rules = 0, odd = 0;
480  AVStream *st;
481 
482  /**
483  * The ASMRuleBook contains a list of comma-separated strings per rule,
484  * and each rule is separated by a ;. The last one also has a ; at the
485  * end so we can use it as delimiter.
486  * Every rule occurs twice, once for when the RTSP packet header marker
487  * is set and once for if it isn't. We only read the first because we
488  * don't care much (that's what the "odd" variable is for).
489  * Each rule contains a set of one or more statements, optionally
490  * preceded by a single condition. If there's a condition, the rule
491  * starts with a '#'. Multiple conditions are merged between brackets,
492  * so there are never multiple conditions spread out over separate
493  * statements. Generally, these conditions are bitrate limits (min/max)
494  * for multi-bitrate streams.
495  */
496  if (*p == '\"') p++;
497  while (1) {
498  if (!(end = strchr(p, ';')))
499  break;
500  if (!odd && end != p) {
501  if (n_rules > 0)
502  st = add_dstream(s, orig_st);
503  else
504  st = orig_st;
505  if (!st)
506  break;
507  real_parse_asm_rule(st, p, end);
508  n_rules++;
509  }
510  p = end + 1;
511  odd ^= 1;
512  }
513 }
514 
515 void
517  const char *line)
518 {
519  const char *p = line;
520 
521  if (av_strstart(p, "ASMRuleBook:string;", &p))
522  real_parse_asm_rulebook(s, s->streams[stream_index], p);
523 }
524 
525 
526 
527 static av_cold int rdt_init(AVFormatContext *s, int st_index, PayloadContext *rdt)
528 {
529  int ret;
530 
531  rdt->rmctx = avformat_alloc_context();
532  if (!rdt->rmctx)
533  return AVERROR(ENOMEM);
534 
535  if ((ret = ff_copy_whiteblacklists(rdt->rmctx, s)) < 0)
536  return ret;
537 
538  return avformat_open_input(&rdt->rmctx, "", &ff_rdt_demuxer, NULL);
539 }
540 
541 static void
543 {
544  int i;
545 
546  for (i = 0; i < rdt->nb_rmst; i++)
547  if (rdt->rmst[i]) {
548  ff_rm_free_rmstream(rdt->rmst[i]);
549  av_freep(&rdt->rmst[i]);
550  }
551  if (rdt->rmctx)
553  av_freep(&rdt->mlti_data);
554  av_freep(&rdt->rmst);
555 }
556 
557 #define RDT_HANDLER(n, s, t) \
558 const RTPDynamicProtocolHandler ff_rdt_ ## n ## _handler = { \
559  .enc_name = s, \
560  .codec_type = t, \
561  .codec_id = AV_CODEC_ID_NONE, \
562  .priv_data_size = sizeof(PayloadContext), \
563  .init = rdt_init, \
564  .parse_sdp_a_line = rdt_parse_sdp_line, \
565  .close = rdt_close_context, \
566  .parse_packet = rdt_parse_packet \
567 }
568 
569 RDT_HANDLER(live_video, "x-pn-multirate-realvideo-live", AVMEDIA_TYPE_VIDEO);
570 RDT_HANDLER(live_audio, "x-pn-multirate-realaudio-live", AVMEDIA_TYPE_AUDIO);
571 RDT_HANDLER(video, "x-pn-realvideo", AVMEDIA_TYPE_VIDEO);
572 RDT_HANDLER(audio, "x-pn-realaudio", AVMEDIA_TYPE_AUDIO);
573 
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:385
rdt_parse_b64buf
static unsigned char * rdt_parse_b64buf(unsigned int *target_len, const char *p)
Definition: rdt.c:393
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:724
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
PayloadContext::mlti_data
uint8_t * mlti_data
Definition: rdt.c:87
FFStream::first_dts
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: internal.h:422
ff_rdt_demuxer
const AVInputFormat ff_rdt_demuxer
Definition: rmdec.c:1155
avio_context_free
void avio_context_free(AVIOContext **s)
Free the supplied IO context and everything associated with it.
Definition: aviobuf.c:147
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:547
PayloadContext::buffer
char buffer[RTP_MAX_PACKET_LENGTH+AV_INPUT_BUFFER_PADDING_SIZE]
Definition: rdt.c:89
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:220
PayloadContext::rmst
RMStream ** rmst
Definition: rdt.c:86
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1165
RDT_HANDLER
#define RDT_HANDLER(n, s, t)
Definition: rdt.c:557
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:969
RDTDemuxContext::prev_set_id
int prev_set_id
Definition: rdt.c:51
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:94
av_strlcatf
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:101
FFIOContext
Definition: avio_internal.h:29
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:660
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:468
avformat_close_input
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: demux.c:355
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:380
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:426
GetBitContext
Definition: get_bits.h:62
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:336
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:486
RMStream
Definition: rmdec.c:43
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)
Definition: utils.c:1098
ff_rdt_parse_close
void ff_rdt_parse_close(RDTDemuxContext *s)
Definition: rdt.c:78
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:773
pkt
AVPacket * pkt
Definition: movenc.c:59
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:207
RDTDemuxContext
Definition: rdt.c:39
rdt_parse_sdp_line
static int rdt_parse_sdp_line(AVFormatContext *s, int st_index, PayloadContext *rdt, const char *line)
Definition: rdt.c:410
real_parse_asm_rulebook
static void real_parse_asm_rulebook(AVFormatContext *s, AVStream *orig_st, const char *p)
Definition: rdt.c:475
s
#define s(width, name)
Definition: cbs_vp9.c:257
RDTDemuxContext::prev_stream_id
int prev_stream_id
Definition: rdt.c:51
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
ctx
AVFormatContext * ctx
Definition: movenc.c:48
get_bits.h
handler
static void handler(vbi_event *ev, void *user_data)
Definition: libzvbi-teletextdec.c:507
RDTDemuxContext::ic
AVFormatContext * ic
the containing (RTSP) demux context
Definition: rdt.c:40
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:992
PayloadContext::mlti_data_size
unsigned int mlti_data_size
Definition: rdt.c:88
NULL
#define NULL
Definition: coverity.c:32
RDTDemuxContext::dynamic_protocol_context
void * dynamic_protocol_context
Definition: rdt.c:48
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:499
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1139
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:79
base64.h
rtpdec.h
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1153
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:424
XOR_TABLE_SIZE
#define XOR_TABLE_SIZE
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:742
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
RDTDemuxContext::streams
AVStream ** streams
Each RDT stream-set (represented by one RTSPStream) can contain multiple streams (of the same content...
Definition: rdt.c:46
avformat_alloc_context
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:154
rdt_close_context
static void rdt_close_context(PayloadContext *rdt)
Definition: rdt.c:542
FFIOContext::pub
AVIOContext pub
Definition: avio_internal.h:30
ff_copy_whiteblacklists
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: utils.c:114
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:185
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:202
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:55
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:34
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:516
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:881
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:366
avio_internal.h
ffio_init_context
void ffio_init_context(FFIOContext *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:80
add_dstream
static AVStream * add_dstream(AVFormatContext *s, AVStream *orig_st)
Definition: rdt.c:461
RDTDemuxContext::prev_timestamp
uint32_t prev_timestamp
Definition: rdt.c:50
md5.h
ff_rm_alloc_rmstream
RMStream * ff_rm_alloc_rmstream(void)
Definition: rmdec.c:105
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, 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:130
PayloadContext::nb_rmst
int nb_rmst
Definition: rdt.c:85
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:263
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:47
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:1595
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:852
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:845
PayloadContext::rmctx
AVFormatContext * rmctx
Definition: rdt.c:84
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
real_parse_asm_rule
static void real_parse_asm_rule(AVStream *st, const char *p, const char *end)
Definition: rdt.c:448
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:758
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
RDTDemuxContext::parse_packet
DynamicPayloadPacketHandlerProc parse_packet
Definition: rdt.c:49
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:846
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:295
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:527
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:333
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
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
rdt.h
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
PayloadContext::audio_pkt_cnt
int audio_pkt_cnt
remaining audio packets in rmdec
Definition: rdt.c:90
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
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:114
avstring.h
PayloadContext
RTP/JPEG specific private data.
Definition: rdt.c:83
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:65
rdt_load_mdpr
static int rdt_load_mdpr(PayloadContext *rdt, AVStream *st, int rule_nr)
Definition: rdt.c:132
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