Libav
rdt.c
Go to the documentation of this file.
1 /*
2  * Realmedia RTSP protocol (RDT) support.
3  * Copyright (c) 2007 Ronald S. Bultje
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
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 
47  int n_streams;
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;
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 
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) < 0)
180  return -1;
181 
182  return 0;
183 }
184 
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;
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 
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;
350  s->streams[s->prev_stream_id],
351  pkt, &timestamp, NULL, 0, 0, flags);
352  return rv;
353  }
354 
355  if (len < 12)
356  return -1;
357  rv = ff_rdt_parse_header(buf, len, &set_id, &seq_no, &stream_id, &is_keyframe, &timestamp);
358  if (rv < 0)
359  return rv;
360  if (is_keyframe &&
361  (set_id != s->prev_set_id || timestamp != s->prev_timestamp ||
362  stream_id != s->prev_stream_id)) {
363  flags |= RTP_FLAG_KEY;
364  s->prev_set_id = set_id;
365  s->prev_timestamp = timestamp;
366  }
367  s->prev_stream_id = stream_id;
368  buf += rv;
369  len -= rv;
370 
371  if (s->prev_stream_id >= s->n_streams) {
372  s->prev_stream_id = -1;
373  return -1;
374  }
375 
377  s->streams[s->prev_stream_id],
378  pkt, &timestamp, buf, len, 0, flags);
379 
380  return rv;
381 }
382 
383 void
384 ff_rdt_subscribe_rule (char *cmd, int size,
385  int stream_nr, int rule_nr)
386 {
387  av_strlcatf(cmd, size, "stream=%d;rule=%d,stream=%d;rule=%d",
388  stream_nr, rule_nr * 2, stream_nr, rule_nr * 2 + 1);
389 }
390 
391 static unsigned char *
392 rdt_parse_b64buf (unsigned int *target_len, const char *p)
393 {
394  unsigned char *target;
395  int len = strlen(p);
396  if (*p == '\"') {
397  p++;
398  len -= 2; /* skip embracing " at start/end */
399  }
400  *target_len = len * 3 / 4;
401  target = av_mallocz(*target_len + FF_INPUT_BUFFER_PADDING_SIZE);
402  if (!target)
403  return NULL;
404  av_base64_decode(target, p, *target_len);
405  return target;
406 }
407 
408 static int
410  PayloadContext *rdt, const char *line)
411 {
412  AVStream *stream = s->streams[st_index];
413  const char *p = line;
414 
415  if (av_strstart(p, "OpaqueData:buffer;", &p)) {
416  rdt->mlti_data = rdt_parse_b64buf(&rdt->mlti_data_size, p);
417  } else if (av_strstart(p, "StartTime:integer;", &p))
418  stream->first_dts = atoi(p);
419  else if (av_strstart(p, "ASMRuleBook:string;", &p)) {
420  int n, first = -1;
421 
422  for (n = 0; n < s->nb_streams; n++)
423  if (s->streams[n]->id == stream->id) {
424  int count = s->streams[n]->index + 1, err;
425  if (first == -1) first = n;
426  if (rdt->nb_rmst < count) {
427  if ((err = av_reallocp(&rdt->rmst,
428  count * sizeof(*rdt->rmst))) < 0) {
429  rdt->nb_rmst = 0;
430  return err;
431  }
432  memset(rdt->rmst + rdt->nb_rmst, 0,
433  (count - rdt->nb_rmst) * sizeof(*rdt->rmst));
434  rdt->nb_rmst = count;
435  }
436  rdt->rmst[s->streams[n]->index] = ff_rm_alloc_rmstream();
437  rdt_load_mdpr(rdt, s->streams[n], (n - first) * 2);
438  }
439  }
440 
441  return 0;
442 }
443 
444 static void
445 real_parse_asm_rule(AVStream *st, const char *p, const char *end)
446 {
447  do {
448  /* can be either averagebandwidth= or AverageBandwidth= */
449  if (sscanf(p, " %*1[Aa]verage%*1[Bb]andwidth=%d", &st->codec->bit_rate) == 1)
450  break;
451  if (!(p = strchr(p, ',')) || p > end)
452  p = end;
453  p++;
454  } while (p < end);
455 }
456 
457 static AVStream *
459 {
460  AVStream *st;
461 
462  if (!(st = avformat_new_stream(s, NULL)))
463  return NULL;
464  st->id = orig_st->id;
465  st->codec->codec_type = orig_st->codec->codec_type;
466  st->first_dts = orig_st->first_dts;
467 
468  return st;
469 }
470 
471 static void
473  const char *p)
474 {
475  const char *end;
476  int n_rules = 0, odd = 0;
477  AVStream *st;
478 
493  if (*p == '\"') p++;
494  while (1) {
495  if (!(end = strchr(p, ';')))
496  break;
497  if (!odd && end != p) {
498  if (n_rules > 0)
499  st = add_dstream(s, orig_st);
500  else
501  st = orig_st;
502  if (!st)
503  break;
504  real_parse_asm_rule(st, p, end);
505  n_rules++;
506  }
507  p = end + 1;
508  odd ^= 1;
509  }
510 }
511 
512 void
514  const char *line)
515 {
516  const char *p = line;
517 
518  if (av_strstart(p, "ASMRuleBook:string;", &p))
519  real_parse_asm_rulebook(s, s->streams[stream_index], p);
520 }
521 
522 static PayloadContext *
524 {
525  PayloadContext *rdt = av_mallocz(sizeof(PayloadContext));
526  int ret;
527  if (!rdt)
528  return NULL;
529  ret = avformat_open_input(&rdt->rmctx, "", &ff_rdt_demuxer, NULL);
530  if (ret < 0) {
531  av_free(rdt);
532  return NULL;
533  }
534 
535  return rdt;
536 }
537 
538 static void
540 {
541  int i;
542 
543  for (i = 0; i < rdt->nb_rmst; i++)
544  if (rdt->rmst[i]) {
545  ff_rm_free_rmstream(rdt->rmst[i]);
546  av_freep(&rdt->rmst[i]);
547  }
548  if (rdt->rmctx)
550  av_freep(&rdt->mlti_data);
551  av_freep(&rdt->rmst);
552  av_free(rdt);
553 }
554 
555 #define RDT_HANDLER(n, s, t) \
556 static RTPDynamicProtocolHandler rdt_ ## n ## _handler = { \
557  .enc_name = s, \
558  .codec_type = t, \
559  .codec_id = AV_CODEC_ID_NONE, \
560  .parse_sdp_a_line = rdt_parse_sdp_line, \
561  .alloc = rdt_new_context, \
562  .free = rdt_free_context, \
563  .parse_packet = rdt_parse_packet \
564 }
565 
566 RDT_HANDLER(live_video, "x-pn-multirate-realvideo-live", AVMEDIA_TYPE_VIDEO);
567 RDT_HANDLER(live_audio, "x-pn-multirate-realaudio-live", AVMEDIA_TYPE_AUDIO);
568 RDT_HANDLER(video, "x-pn-realvideo", AVMEDIA_TYPE_VIDEO);
569 RDT_HANDLER(audio, "x-pn-realaudio", AVMEDIA_TYPE_AUDIO);
570 
572 {
573  ff_register_dynamic_payload_handler(&rdt_video_handler);
574  ff_register_dynamic_payload_handler(&rdt_audio_handler);
575  ff_register_dynamic_payload_handler(&rdt_live_video_handler);
576  ff_register_dynamic_payload_handler(&rdt_live_audio_handler);
577 }
static void real_parse_asm_rulebook(AVFormatContext *s, AVStream *orig_st, const char *p)
Definition: rdt.c:472
int64_t first_dts
Definition: avformat.h:850
int n_streams
streams with identifical content in this set
Definition: rdt.c:47
Bytestream IO Context.
Definition: avio.h:68
int size
#define RTP_MAX_PACKET_LENGTH
Definition: rtpdec.h:36
static int is_keyframe(NalUnitType naltype)
Definition: libx265.c:47
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.
Definition: utils.c:247
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:700
Definition: rmdec.c:41
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:186
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:580
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:409
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:922
int prev_set_id
Definition: rdt.c:51
int ff_rm_read_mdpr_codecdata(AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *rst, int codec_data_size)
Read the MDPR chunk, which contains stream-specific codec initialization parameters.
Definition: rmdec.c:286
uint8_t
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:595
int id
Format-specific stream ID.
Definition: avformat.h:706
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:718
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2497
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:990
AVStream ** streams
Each RDT stream-set (represented by one RTSPStream) can contain multiple streams (of the same content...
Definition: rdt.c:46
int av_reallocp(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:140
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
static int flags
Definition: log.c:44
uint32_t tag
Definition: movenc.c:844
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:175
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
AVFormatContext * rmctx
Definition: rdt.c:84
void ff_register_rdt_dynamic_payload_handlers(void)
Register RDT-related dynamic payload handlers with our cache.
Definition: rdt.c:571
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:107
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
static PayloadContext * rdt_new_context(void)
Definition: rdt.c:523
int audio_pkt_cnt
remaining audio packets in rmdec
Definition: rdt.c:90
#define AV_RB16
Definition: intreadwrite.h:53
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:564
#define XOR_TABLE_SIZE
int prev_stream_id
Definition: rdt.c:51
Definition: graph2dot.c:49
DynamicPayloadPacketHandlerProc parse_packet
Parse handler for this dynamic packet.
Definition: rtpdec.h:133
uint8_t * mlti_data
Definition: rdt.c:87
AVFormatContext * ic
the containing (RTSP) demux context
Definition: rdt.c:40
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:531
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:978
int bit_rate
the average bitrate
Definition: avcodec.h:1108
int(* DynamicPayloadPacketHandlerProc)(AVFormatContext *ctx, PayloadContext *s, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, uint16_t seq, int flags)
Packet parsing for "private" payloads in the RTP specs.
Definition: rtpdec.h:108
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:210
uint32_t prev_timestamp
Definition: rdt.c:50
static void rdt_free_context(PayloadContext *rdt)
Definition: rdt.c:539
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:699
NULL
Definition: eval.c:55
DynamicPayloadPacketHandlerProc parse_packet
Definition: rdt.c:49
enum AVMediaType codec_type
Definition: avcodec.h:1052
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:808
#define RTP_FLAG_KEY
RTP packet contains a keyframe.
Definition: rtpdec.h:92
enum AVCodecID codec_id
Definition: avcodec.h:1061
AVIOContext * pb
I/O context.
Definition: avformat.h:964
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
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:271
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:263
void ff_real_parse_sdp_a_line(AVFormatContext *s, int stream_index, const char *line)
Parse a server-related SDP line.
Definition: rdt.c:513
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:99
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:304
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:32
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:70
static void real_parse_asm_rule(AVStream *st, const char *p, const char *end)
Definition: rdt.c:445
void ff_rdt_calc_response_and_checksum(char response[41], char chksum[9], const char *challenge)
Calculate the response (RealChallenge2 in the RTSP header) to the challenge (RealChallenge1 in the RT...
Definition: rdt.c:94
void ff_rm_free_rmstream(RMStream *rms)
Definition: rmdec.c:116
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:2475
static AVStream * add_dstream(AVFormatContext *s, AVStream *orig_st)
Definition: rdt.c:458
int len
unsigned int mlti_data_size
Definition: rdt.c:88
int av_base64_decode(uint8_t *out, const char *in, int out_size)
Decode a base64-encoded string.
Definition: base64.c:45
AVInputFormat ff_rdt_demuxer
Definition: rmdec.c:965
int stream_index
Definition: avcodec.h:969
#define MKTAG(a, b, c, d)
Definition: common.h:238
#define RDT_HANDLER(n, s, t)
Definition: rdt.c:555
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Definition: utils.c:2751
This structure stores compressed data.
Definition: avcodec.h:944
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
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:960