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  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  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;
303 
304  ffio_init_context(&pb, buf, len, 0, NULL, NULL, NULL, NULL);
305  flags = (flags & RTP_FLAG_KEY) ? 2 : 0;
306  res = ff_rm_parse_packet (rdt->rmctx, &pb, st, rdt->rmst[st->index], len, pkt,
307  &seq, flags, *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
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 + FF_INPUT_BUFFER_PADDING_SIZE);
402  av_base64_decode(target, p, *target_len);
403  return target;
404 }
405 
406 static int
408  PayloadContext *rdt, const char *line)
409 {
410  AVStream *stream = s->streams[st_index];
411  const char *p = line;
412 
413  if (av_strstart(p, "OpaqueData:buffer;", &p)) {
414  rdt->mlti_data = rdt_parse_b64buf(&rdt->mlti_data_size, p);
415  } else if (av_strstart(p, "StartTime:integer;", &p))
416  stream->first_dts = atoi(p);
417  else if (av_strstart(p, "ASMRuleBook:string;", &p)) {
418  int n, first = -1;
419 
420  for (n = 0; n < s->nb_streams; n++)
421  if (s->streams[n]->id == stream->id) {
422  int count = s->streams[n]->index + 1;
423  if (first == -1) first = n;
424  if (rdt->nb_rmst < count) {
425  RMStream **rmst= av_realloc(rdt->rmst, count*sizeof(*rmst));
426  if (!rmst)
427  return AVERROR(ENOMEM);
428  memset(rmst + rdt->nb_rmst, 0,
429  (count - rdt->nb_rmst) * sizeof(*rmst));
430  rdt->rmst = rmst;
431  rdt->nb_rmst = count;
432  }
433  rdt->rmst[s->streams[n]->index] = ff_rm_alloc_rmstream();
434  rdt_load_mdpr(rdt, s->streams[n], (n - first) * 2);
435  }
436  }
437 
438  return 0;
439 }
440 
441 static void
442 real_parse_asm_rule(AVStream *st, const char *p, const char *end)
443 {
444  do {
445  /* can be either averagebandwidth= or AverageBandwidth= */
446  if (sscanf(p, " %*1[Aa]verage%*1[Bb]andwidth=%d", &st->codec->bit_rate) == 1)
447  break;
448  if (!(p = strchr(p, ',')) || p > end)
449  p = end;
450  p++;
451  } while (p < end);
452 }
453 
454 static AVStream *
456 {
457  AVStream *st;
458 
459  if (!(st = avformat_new_stream(s, NULL)))
460  return NULL;
461  st->id = orig_st->id;
462  st->codec->codec_type = orig_st->codec->codec_type;
463  st->first_dts = orig_st->first_dts;
464 
465  return st;
466 }
467 
468 static void
470  const char *p)
471 {
472  const char *end;
473  int n_rules = 0, odd = 0;
474  AVStream *st;
475 
476  /**
477  * The ASMRuleBook contains a list of comma-separated strings per rule,
478  * and each rule is separated by a ;. The last one also has a ; at the
479  * end so we can use it as delimiter.
480  * Every rule occurs twice, once for when the RTSP packet header marker
481  * is set and once for if it isn't. We only read the first because we
482  * don't care much (that's what the "odd" variable is for).
483  * Each rule contains a set of one or more statements, optionally
484  * preceded by a single condition. If there's a condition, the rule
485  * starts with a '#'. Multiple conditions are merged between brackets,
486  * so there are never multiple conditions spread out over separate
487  * statements. Generally, these conditions are bitrate limits (min/max)
488  * for multi-bitrate streams.
489  */
490  if (*p == '\"') p++;
491  while (1) {
492  if (!(end = strchr(p, ';')))
493  break;
494  if (!odd && end != p) {
495  if (n_rules > 0)
496  st = add_dstream(s, orig_st);
497  else
498  st = orig_st;
499  if (!st)
500  break;
501  real_parse_asm_rule(st, p, end);
502  n_rules++;
503  }
504  p = end + 1;
505  odd ^= 1;
506  }
507 }
508 
509 void
511  const char *line)
512 {
513  const char *p = line;
514 
515  if (av_strstart(p, "ASMRuleBook:string;", &p))
516  real_parse_asm_rulebook(s, s->streams[stream_index], p);
517 }
518 
519 static PayloadContext *
521 {
522  PayloadContext *rdt = av_mallocz(sizeof(PayloadContext));
523 
524  int ret = avformat_open_input(&rdt->rmctx, "", &ff_rdt_demuxer, NULL);
525  if (ret < 0) {
526  av_free(rdt);
527  return NULL;
528  }
529 
530  return rdt;
531 }
532 
533 static void
535 {
536  int i;
537 
538  for (i = 0; i < rdt->nb_rmst; i++)
539  if (rdt->rmst[i]) {
540  ff_rm_free_rmstream(rdt->rmst[i]);
541  av_freep(&rdt->rmst[i]);
542  }
543  if (rdt->rmctx)
545  av_freep(&rdt->mlti_data);
546  av_freep(&rdt->rmst);
547  av_free(rdt);
548 }
549 
550 #define RDT_HANDLER(n, s, t) \
551 static RTPDynamicProtocolHandler ff_rdt_ ## n ## _handler = { \
552  .enc_name = s, \
553  .codec_type = t, \
554  .codec_id = AV_CODEC_ID_NONE, \
555  .parse_sdp_a_line = rdt_parse_sdp_line, \
556  .alloc = rdt_new_context, \
557  .free = rdt_free_context, \
558  .parse_packet = rdt_parse_packet \
559 }
560 
561 RDT_HANDLER(live_video, "x-pn-multirate-realvideo-live", AVMEDIA_TYPE_VIDEO);
562 RDT_HANDLER(live_audio, "x-pn-multirate-realaudio-live", AVMEDIA_TYPE_AUDIO);
563 RDT_HANDLER(video, "x-pn-realvideo", AVMEDIA_TYPE_VIDEO);
564 RDT_HANDLER(audio, "x-pn-realaudio", AVMEDIA_TYPE_AUDIO);
565 
567 {
568  ff_register_dynamic_payload_handler(&ff_rdt_video_handler);
569  ff_register_dynamic_payload_handler(&ff_rdt_audio_handler);
570  ff_register_dynamic_payload_handler(&ff_rdt_live_video_handler);
571  ff_register_dynamic_payload_handler(&ff_rdt_live_audio_handler);
572 }
static void real_parse_asm_rulebook(AVFormatContext *s, AVStream *orig_st, const char *p)
Definition: rdt.c:469
int64_t first_dts
Definition: avformat.h:784
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:205
int n_streams
streams with identifical content in this set
Definition: rdt.c:47
const char * s
Definition: avisynth_c.h:668
Bytestream IO Context.
Definition: avio.h:68
#define RTP_MAX_PACKET_LENGTH
Definition: rtpdec.h:36
RMStream * ff_rm_alloc_rmstream(void)
Definition: rmdec.c:109
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
char buffer[RTP_MAX_PACKET_LENGTH+FF_INPUT_BUFFER_PADDING_SIZE]
Definition: rdt.c:89
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:644
Definition: rmdec.c:40
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:199
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:256
void * av_realloc(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:141
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:595
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
static int rdt_parse_sdp_line(AVFormatContext *s, int st_index, PayloadContext *rdt, const char *line)
Definition: rdt.c:407
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
Format I/O context.
Definition: avformat.h:944
int prev_set_id
Definition: rdt.c:51
uint8_t
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:610
static AVPacket pkt
Definition: demuxing.c:56
int id
Format-specific stream ID.
Definition: avformat.h:650
end end
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:771
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But first
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
AVStream ** streams
Definition: avformat.h:992
int ff_rm_read_mdpr_codecdata(AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *rst, int codec_data_size, const uint8_t *mime)
Read the MDPR chunk, which contains stream-specific codec initialization parameters.
Definition: rmdec.c:303
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:193
uint32_t tag
Definition: movenc.c:894
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)
Definition: md5.c:173
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:248
AVFormatContext * rmctx
Definition: rdt.c:84
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:109
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:183
static PayloadContext * rdt_new_context(void)
Definition: rdt.c:520
int audio_pkt_cnt
remaining audio packets in rmdec
Definition: rdt.c:90
#define AV_RB16
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:579
#define XOR_TABLE_SIZE
int prev_stream_id
Definition: rdt.c:51
Definition: graph2dot.c:48
DynamicPayloadPacketHandlerProc parse_packet
Parse handler for this dynamic packet.
Definition: rtpdec.h:137
uint8_t * mlti_data
Definition: rdt.c:87
int size
AVFormatContext * ic
the containing (RTSP) demux context
Definition: rdt.c:40
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:662
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
unsigned int nb_streams
A list of all streams in the file.
Definition: avformat.h:991
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:112
int bit_rate
the average bitrate
ret
Definition: avfilter.c:821
uint32_t prev_timestamp
Definition: rdt.c:50
static void rdt_free_context(PayloadContext *rdt)
Definition: rdt.c:534
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:643
NULL
Definition: eval.c:55
DynamicPayloadPacketHandlerProc parse_packet
Definition: rdt.c:49
enum AVMediaType codec_type
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:861
#define RTP_FLAG_KEY
RTP packet contains a keyframe.
Definition: rtpdec.h:96
enum AVCodecID codec_id
AVIOContext * pb
I/O context.
Definition: avformat.h:977
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:55
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:594
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:273
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:265
void ff_real_parse_sdp_a_line(AVFormatContext *s, int stream_index, const char *line)
Parse a server-related SDP line.
Definition: rdt.c:510
synthesis window for stochastic i
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:379
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:100
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:306
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFilterBuffer 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.Buffer references ownership and permissions
static int flags
Definition: cpu.c:23
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:33
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:71
static void real_parse_asm_rule(AVStream *st, const char *p, const char *end)
Definition: rdt.c:442
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
the buffer and buffer reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFilterBuffer structures They must not be accessed but through references stored in AVFilterBufferRef structures Several references can point to the same buffer
void ff_rm_free_rmstream(RMStream *rms)
Definition: rmdec.c:116
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
static AVStream * add_dstream(AVFormatContext *s, AVStream *orig_st)
Definition: rdt.c:455
A Quick Description Of Rate Distortion Theory We want to encode a video
int len
About Git write you should know how to use GIT properly Luckily Git comes with excellent documentation git help man git shows you the available git< command > help man git< command > shows information about the subcommand< command > The most comprehensive manual is the website Git Reference visit they are quite exhaustive You do not need a special username or password All you need is to provide a ssh public key to the Git server admin What follows now is a basic introduction to Git and some FFmpeg specific guidelines Read it at least if you are granted commit privileges to the FFmpeg project you are expected to be familiar with these rules I if not You can get git from etc no matter how small Every one of them has been saved from looking like a fool by this many times It s very easy for stray debug output or cosmetic modifications to slip please avoid problems through this extra level of scrutiny For cosmetics only commits you should e g by running git config global user name My Name git config global user email my email which is either set in your personal configuration file through git config core editor or set by one of the following environment VISUAL or EDITOR Log messages should be concise but descriptive Explain why you made a what you did will be obvious from the changes themselves most of the time Saying just bug fix or is bad Remember that people of varying skill levels look at and educate themselves while reading through your code Don t include filenames in log Git provides that information Possibly make the commit message have a descriptive first line
Definition: git-howto.txt:153
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.
AVInputFormat ff_rdt_demuxer
Definition: rmdec.c:1036
void INT64 INT64 count
Definition: avisynth_c.h:594
void av_register_rdt_dynamic_payload_handlers(void)
Register RDT-related dynamic payload handlers with our cache.
Definition: rdt.c:566
#define MKTAG(a, b, c, d)
Definition: common.h:282
#define RDT_HANDLER(n, s, t)
Definition: rdt.c:550
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
This structure stores compressed data.
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...