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get_bits.h
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1 /*
2  * copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * bitstream reader API header.
24  */
25 
26 #ifndef AVCODEC_GET_BITS_H
27 #define AVCODEC_GET_BITS_H
28 
29 #include <stdint.h>
30 
31 #include "libavutil/common.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/log.h"
34 #include "libavutil/avassert.h"
35 #include "mathops.h"
36 
37 /*
38  * Safe bitstream reading:
39  * optionally, the get_bits API can check to ensure that we
40  * don't read past input buffer boundaries. This is protected
41  * with CONFIG_SAFE_BITSTREAM_READER at the global level, and
42  * then below that with UNCHECKED_BITSTREAM_READER at the per-
43  * decoder level. This means that decoders that check internally
44  * can "#define UNCHECKED_BITSTREAM_READER 1" to disable
45  * overread checks.
46  * Boundary checking causes a minor performance penalty so for
47  * applications that won't want/need this, it can be disabled
48  * globally using "#define CONFIG_SAFE_BITSTREAM_READER 0".
49  */
50 #ifndef UNCHECKED_BITSTREAM_READER
51 #define UNCHECKED_BITSTREAM_READER !CONFIG_SAFE_BITSTREAM_READER
52 #endif
53 
54 typedef struct GetBitContext {
56  int index;
60 
61 #define VLC_TYPE int16_t
62 
63 typedef struct VLC {
64  int bits;
65  VLC_TYPE (*table)[2]; ///< code, bits
67 } VLC;
68 
69 typedef struct RL_VLC_ELEM {
70  int16_t level;
71  int8_t len;
73 } RL_VLC_ELEM;
74 
75 /* Bitstream reader API docs:
76  * name
77  * arbitrary name which is used as prefix for the internal variables
78  *
79  * gb
80  * getbitcontext
81  *
82  * OPEN_READER(name, gb)
83  * load gb into local variables
84  *
85  * CLOSE_READER(name, gb)
86  * store local vars in gb
87  *
88  * UPDATE_CACHE(name, gb)
89  * Refill the internal cache from the bitstream.
90  * After this call at least MIN_CACHE_BITS will be available.
91  *
92  * GET_CACHE(name, gb)
93  * Will output the contents of the internal cache,
94  * next bit is MSB of 32 or 64 bit (FIXME 64bit).
95  *
96  * SHOW_UBITS(name, gb, num)
97  * Will return the next num bits.
98  *
99  * SHOW_SBITS(name, gb, num)
100  * Will return the next num bits and do sign extension.
101  *
102  * SKIP_BITS(name, gb, num)
103  * Will skip over the next num bits.
104  * Note, this is equivalent to SKIP_CACHE; SKIP_COUNTER.
105  *
106  * SKIP_CACHE(name, gb, num)
107  * Will remove the next num bits from the cache (note SKIP_COUNTER
108  * MUST be called before UPDATE_CACHE / CLOSE_READER).
109  *
110  * SKIP_COUNTER(name, gb, num)
111  * Will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS).
112  *
113  * LAST_SKIP_BITS(name, gb, num)
114  * Like SKIP_BITS, to be used if next call is UPDATE_CACHE or CLOSE_READER.
115  *
116  * BITS_LEFT(name, gb)
117  * Return the number of bits left
118  *
119  * For examples see get_bits, show_bits, skip_bits, get_vlc.
120  */
121 
122 #ifdef LONG_BITSTREAM_READER
123 # define MIN_CACHE_BITS 32
124 #else
125 # define MIN_CACHE_BITS 25
126 #endif
127 
128 #define OPEN_READER_NOSIZE(name, gb) \
129  unsigned int name ## _index = (gb)->index; \
130  unsigned int av_unused name ## _cache
131 
132 #if UNCHECKED_BITSTREAM_READER
133 #define OPEN_READER(name, gb) OPEN_READER_NOSIZE(name, gb)
134 
135 #define BITS_AVAILABLE(name, gb) 1
136 #else
137 #define OPEN_READER(name, gb) \
138  OPEN_READER_NOSIZE(name, gb); \
139  unsigned int name ## _size_plus8 = (gb)->size_in_bits_plus8
140 
141 #define BITS_AVAILABLE(name, gb) name ## _index < name ## _size_plus8
142 #endif
143 
144 #define CLOSE_READER(name, gb) (gb)->index = name ## _index
145 
146 # ifdef LONG_BITSTREAM_READER
147 
148 # define UPDATE_CACHE_LE(name, gb) name ## _cache = \
149  AV_RL64((gb)->buffer + (name ## _index >> 3)) >> (name ## _index & 7)
150 
151 # define UPDATE_CACHE_BE(name, gb) name ## _cache = \
152  AV_RB64((gb)->buffer + (name ## _index >> 3)) >> (32 - (name ## _index & 7))
153 
154 #else
155 
156 # define UPDATE_CACHE_LE(name, gb) name ## _cache = \
157  AV_RL32((gb)->buffer + (name ## _index >> 3)) >> (name ## _index & 7)
158 
159 # define UPDATE_CACHE_BE(name, gb) name ## _cache = \
160  AV_RB32((gb)->buffer + (name ## _index >> 3)) << (name ## _index & 7)
161 
162 #endif
163 
164 
165 #ifdef BITSTREAM_READER_LE
166 
167 # define UPDATE_CACHE(name, gb) UPDATE_CACHE_LE(name, gb)
168 
169 # define SKIP_CACHE(name, gb, num) name ## _cache >>= (num)
170 
171 #else
172 
173 # define UPDATE_CACHE(name, gb) UPDATE_CACHE_BE(name, gb)
174 
175 # define SKIP_CACHE(name, gb, num) name ## _cache <<= (num)
176 
177 #endif
178 
179 #if UNCHECKED_BITSTREAM_READER
180 # define SKIP_COUNTER(name, gb, num) name ## _index += (num)
181 #else
182 # define SKIP_COUNTER(name, gb, num) \
183  name ## _index = FFMIN(name ## _size_plus8, name ## _index + (num))
184 #endif
185 
186 #define BITS_LEFT(name, gb) ((int)((gb)->size_in_bits - name ## _index))
187 
188 #define SKIP_BITS(name, gb, num) \
189  do { \
190  SKIP_CACHE(name, gb, num); \
191  SKIP_COUNTER(name, gb, num); \
192  } while (0)
193 
194 #define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
195 
196 #define SHOW_UBITS_LE(name, gb, num) zero_extend(name ## _cache, num)
197 #define SHOW_SBITS_LE(name, gb, num) sign_extend(name ## _cache, num)
198 
199 #define SHOW_UBITS_BE(name, gb, num) NEG_USR32(name ## _cache, num)
200 #define SHOW_SBITS_BE(name, gb, num) NEG_SSR32(name ## _cache, num)
201 
202 #ifdef BITSTREAM_READER_LE
203 # define SHOW_UBITS(name, gb, num) SHOW_UBITS_LE(name, gb, num)
204 # define SHOW_SBITS(name, gb, num) SHOW_SBITS_LE(name, gb, num)
205 #else
206 # define SHOW_UBITS(name, gb, num) SHOW_UBITS_BE(name, gb, num)
207 # define SHOW_SBITS(name, gb, num) SHOW_SBITS_BE(name, gb, num)
208 #endif
209 
210 #define GET_CACHE(name, gb) ((uint32_t) name ## _cache)
211 
212 static inline int get_bits_count(const GetBitContext *s)
213 {
214  return s->index;
215 }
216 
217 static inline void skip_bits_long(GetBitContext *s, int n)
218 {
219 #if UNCHECKED_BITSTREAM_READER
220  s->index += n;
221 #else
222  s->index += av_clip(n, -s->index, s->size_in_bits_plus8 - s->index);
223 #endif
224 }
225 
226 /**
227  * read mpeg1 dc style vlc (sign bit + mantissa with no MSB).
228  * if MSB not set it is negative
229  * @param n length in bits
230  */
231 static inline int get_xbits(GetBitContext *s, int n)
232 {
233  register int sign;
234  register int32_t cache;
235  OPEN_READER(re, s);
236  av_assert2(n>0 && n<=25);
237  UPDATE_CACHE(re, s);
238  cache = GET_CACHE(re, s);
239  sign = ~cache >> 31;
240  LAST_SKIP_BITS(re, s, n);
241  CLOSE_READER(re, s);
242  return (NEG_USR32(sign ^ cache, n) ^ sign) - sign;
243 }
244 
245 static inline int get_sbits(GetBitContext *s, int n)
246 {
247  register int tmp;
248  OPEN_READER(re, s);
249  av_assert2(n>0 && n<=25);
250  UPDATE_CACHE(re, s);
251  tmp = SHOW_SBITS(re, s, n);
252  LAST_SKIP_BITS(re, s, n);
253  CLOSE_READER(re, s);
254  return tmp;
255 }
256 
257 /**
258  * Read 1-25 bits.
259  */
260 static inline unsigned int get_bits(GetBitContext *s, int n)
261 {
262  register int tmp;
263  OPEN_READER(re, s);
264  av_assert2(n>0 && n<=25);
265  UPDATE_CACHE(re, s);
266  tmp = SHOW_UBITS(re, s, n);
267  LAST_SKIP_BITS(re, s, n);
268  CLOSE_READER(re, s);
269  return tmp;
270 }
271 
272 /**
273  * Read 0-25 bits.
274  */
276 {
277  return n ? get_bits(s, n) : 0;
278 }
279 
280 static inline unsigned int get_bits_le(GetBitContext *s, int n)
281 {
282  register int tmp;
283  OPEN_READER(re, s);
284  av_assert2(n>0 && n<=25);
285  UPDATE_CACHE_LE(re, s);
286  tmp = SHOW_UBITS_LE(re, s, n);
287  LAST_SKIP_BITS(re, s, n);
288  CLOSE_READER(re, s);
289  return tmp;
290 }
291 
292 /**
293  * Show 1-25 bits.
294  */
295 static inline unsigned int show_bits(GetBitContext *s, int n)
296 {
297  register int tmp;
299  av_assert2(n>0 && n<=25);
300  UPDATE_CACHE(re, s);
301  tmp = SHOW_UBITS(re, s, n);
302  return tmp;
303 }
304 
305 static inline void skip_bits(GetBitContext *s, int n)
306 {
307  OPEN_READER(re, s);
308  LAST_SKIP_BITS(re, s, n);
309  CLOSE_READER(re, s);
310 }
311 
312 static inline unsigned int get_bits1(GetBitContext *s)
313 {
314  unsigned int index = s->index;
315  uint8_t result = s->buffer[index >> 3];
316 #ifdef BITSTREAM_READER_LE
317  result >>= index & 7;
318  result &= 1;
319 #else
320  result <<= index & 7;
321  result >>= 8 - 1;
322 #endif
323 #if !UNCHECKED_BITSTREAM_READER
324  if (s->index < s->size_in_bits_plus8)
325 #endif
326  index++;
327  s->index = index;
328 
329  return result;
330 }
331 
332 static inline unsigned int show_bits1(GetBitContext *s)
333 {
334  return show_bits(s, 1);
335 }
336 
337 static inline void skip_bits1(GetBitContext *s)
338 {
339  skip_bits(s, 1);
340 }
341 
342 /**
343  * Read 0-32 bits.
344  */
345 static inline unsigned int get_bits_long(GetBitContext *s, int n)
346 {
347  if (!n) {
348  return 0;
349  } else if (n <= MIN_CACHE_BITS) {
350  return get_bits(s, n);
351  } else {
352 #ifdef BITSTREAM_READER_LE
353  unsigned ret = get_bits(s, 16);
354  return ret | (get_bits(s, n - 16) << 16);
355 #else
356  unsigned ret = get_bits(s, 16) << (n - 16);
357  return ret | get_bits(s, n - 16);
358 #endif
359  }
360 }
361 
362 /**
363  * Read 0-64 bits.
364  */
365 static inline uint64_t get_bits64(GetBitContext *s, int n)
366 {
367  if (n <= 32) {
368  return get_bits_long(s, n);
369  } else {
370 #ifdef BITSTREAM_READER_LE
371  uint64_t ret = get_bits_long(s, 32);
372  return ret | (uint64_t) get_bits_long(s, n - 32) << 32;
373 #else
374  uint64_t ret = (uint64_t) get_bits_long(s, n - 32) << 32;
375  return ret | get_bits_long(s, 32);
376 #endif
377  }
378 }
379 
380 /**
381  * Read 0-32 bits as a signed integer.
382  */
383 static inline int get_sbits_long(GetBitContext *s, int n)
384 {
385  return sign_extend(get_bits_long(s, n), n);
386 }
387 
388 /**
389  * Show 0-32 bits.
390  */
391 static inline unsigned int show_bits_long(GetBitContext *s, int n)
392 {
393  if (n <= MIN_CACHE_BITS) {
394  return show_bits(s, n);
395  } else {
396  GetBitContext gb = *s;
397  return get_bits_long(&gb, n);
398  }
399 }
400 
401 static inline int check_marker(GetBitContext *s, const char *msg)
402 {
403  int bit = get_bits1(s);
404  if (!bit)
405  av_log(NULL, AV_LOG_INFO, "Marker bit missing at %d of %d %s\n", get_bits_count(s) - 1, s->size_in_bits, msg);
406 
407  return bit;
408 }
409 
410 /**
411  * Initialize GetBitContext.
412  * @param buffer bitstream buffer, must be AV_INPUT_BUFFER_PADDING_SIZE bytes
413  * larger than the actual read bits because some optimized bitstream
414  * readers read 32 or 64 bit at once and could read over the end
415  * @param bit_size the size of the buffer in bits
416  * @return 0 on success, AVERROR_INVALIDDATA if the buffer_size would overflow.
417  */
418 static inline int init_get_bits(GetBitContext *s, const uint8_t *buffer,
419  int bit_size)
420 {
421  int buffer_size;
422  int ret = 0;
423 
424  if (bit_size >= INT_MAX - 7 || bit_size < 0 || !buffer) {
425  bit_size = 0;
426  buffer = NULL;
427  ret = AVERROR_INVALIDDATA;
428  }
429 
430  buffer_size = (bit_size + 7) >> 3;
431 
432  s->buffer = buffer;
433  s->size_in_bits = bit_size;
434  s->size_in_bits_plus8 = bit_size + 8;
435  s->buffer_end = buffer + buffer_size;
436  s->index = 0;
437 
438  return ret;
439 }
440 
441 /**
442  * Initialize GetBitContext.
443  * @param buffer bitstream buffer, must be AV_INPUT_BUFFER_PADDING_SIZE bytes
444  * larger than the actual read bits because some optimized bitstream
445  * readers read 32 or 64 bit at once and could read over the end
446  * @param byte_size the size of the buffer in bytes
447  * @return 0 on success, AVERROR_INVALIDDATA if the buffer_size would overflow.
448  */
449 static inline int init_get_bits8(GetBitContext *s, const uint8_t *buffer,
450  int byte_size)
451 {
452  if (byte_size > INT_MAX / 8 || byte_size < 0)
453  byte_size = -1;
454  return init_get_bits(s, buffer, byte_size * 8);
455 }
456 
457 static inline const uint8_t *align_get_bits(GetBitContext *s)
458 {
459  int n = -get_bits_count(s) & 7;
460  if (n)
461  skip_bits(s, n);
462  return s->buffer + (s->index >> 3);
463 }
464 
465 #define init_vlc(vlc, nb_bits, nb_codes, \
466  bits, bits_wrap, bits_size, \
467  codes, codes_wrap, codes_size, \
468  flags) \
469  ff_init_vlc_sparse(vlc, nb_bits, nb_codes, \
470  bits, bits_wrap, bits_size, \
471  codes, codes_wrap, codes_size, \
472  NULL, 0, 0, flags)
473 
474 int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
475  const void *bits, int bits_wrap, int bits_size,
476  const void *codes, int codes_wrap, int codes_size,
477  const void *symbols, int symbols_wrap, int symbols_size,
478  int flags);
479 void ff_free_vlc(VLC *vlc);
480 
481 #define INIT_VLC_LE 2
482 #define INIT_VLC_USE_NEW_STATIC 4
483 
484 #define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size) \
485  do { \
486  static VLC_TYPE table[static_size][2]; \
487  (vlc)->table = table; \
488  (vlc)->table_allocated = static_size; \
489  init_vlc(vlc, bits, a, b, c, d, e, f, g, INIT_VLC_USE_NEW_STATIC); \
490  } while (0)
491 
492 /**
493  * If the vlc code is invalid and max_depth=1, then no bits will be removed.
494  * If the vlc code is invalid and max_depth>1, then the number of bits removed
495  * is undefined.
496  */
497 #define GET_VLC(code, name, gb, table, bits, max_depth) \
498  do { \
499  int n, nb_bits; \
500  unsigned int index; \
501  \
502  index = SHOW_UBITS(name, gb, bits); \
503  code = table[index][0]; \
504  n = table[index][1]; \
505  \
506  if (max_depth > 1 && n < 0) { \
507  LAST_SKIP_BITS(name, gb, bits); \
508  UPDATE_CACHE(name, gb); \
509  \
510  nb_bits = -n; \
511  \
512  index = SHOW_UBITS(name, gb, nb_bits) + code; \
513  code = table[index][0]; \
514  n = table[index][1]; \
515  if (max_depth > 2 && n < 0) { \
516  LAST_SKIP_BITS(name, gb, nb_bits); \
517  UPDATE_CACHE(name, gb); \
518  \
519  nb_bits = -n; \
520  \
521  index = SHOW_UBITS(name, gb, nb_bits) + code; \
522  code = table[index][0]; \
523  n = table[index][1]; \
524  } \
525  } \
526  SKIP_BITS(name, gb, n); \
527  } while (0)
528 
529 #define GET_RL_VLC_INTERNAL(level, run, name, gb, table, bits, \
530  max_depth, need_update) \
531  do { \
532  int n, nb_bits; \
533  unsigned int index; \
534  \
535  index = SHOW_UBITS(name, gb, bits); \
536  level = table[index].level; \
537  n = table[index].len; \
538  \
539  if (max_depth > 1 && n < 0) { \
540  SKIP_BITS(name, gb, bits); \
541  if (need_update) { \
542  UPDATE_CACHE(name, gb); \
543  } \
544  \
545  nb_bits = -n; \
546  \
547  index = SHOW_UBITS(name, gb, nb_bits) + level; \
548  level = table[index].level; \
549  n = table[index].len; \
550  if (max_depth > 2 && n < 0) { \
551  LAST_SKIP_BITS(name, gb, nb_bits); \
552  if (need_update) { \
553  UPDATE_CACHE(name, gb); \
554  } \
555  nb_bits = -n; \
556  \
557  index = SHOW_UBITS(name, gb, nb_bits) + level; \
558  level = table[index].level; \
559  n = table[index].len; \
560  } \
561  } \
562  run = table[index].run; \
563  SKIP_BITS(name, gb, n); \
564  } while (0)
565 
566 /**
567  * Parse a vlc code.
568  * @param bits is the number of bits which will be read at once, must be
569  * identical to nb_bits in init_vlc()
570  * @param max_depth is the number of times bits bits must be read to completely
571  * read the longest vlc code
572  * = (max_vlc_length + bits - 1) / bits
573  */
575  int bits, int max_depth)
576 {
577  int code;
578 
579  OPEN_READER(re, s);
580  UPDATE_CACHE(re, s);
581 
582  GET_VLC(code, re, s, table, bits, max_depth);
583 
584  CLOSE_READER(re, s);
585 
586  return code;
587 }
588 
589 static inline int decode012(GetBitContext *gb)
590 {
591  int n;
592  n = get_bits1(gb);
593  if (n == 0)
594  return 0;
595  else
596  return get_bits1(gb) + 1;
597 }
598 
599 static inline int decode210(GetBitContext *gb)
600 {
601  if (get_bits1(gb))
602  return 0;
603  else
604  return 2 - get_bits1(gb);
605 }
606 
607 static inline int get_bits_left(GetBitContext *gb)
608 {
609  return gb->size_in_bits - get_bits_count(gb);
610 }
611 
612 static inline int skip_1stop_8data_bits(GetBitContext *gb)
613 {
614  if (get_bits_left(gb) <= 0)
615  return AVERROR_INVALIDDATA;
616 
617  while (get_bits1(gb)) {
618  skip_bits(gb, 8);
619  if (get_bits_left(gb) <= 0)
620  return AVERROR_INVALIDDATA;
621  }
622 
623  return 0;
624 }
625 
626 //#define TRACE
627 
628 #ifdef TRACE
629 static inline void print_bin(int bits, int n)
630 {
631  int i;
632 
633  for (i = n - 1; i >= 0; i--)
634  av_log(NULL, AV_LOG_DEBUG, "%d", (bits >> i) & 1);
635  for (i = n; i < 24; i++)
636  av_log(NULL, AV_LOG_DEBUG, " ");
637 }
638 
639 static inline int get_bits_trace(GetBitContext *s, int n, const char *file,
640  const char *func, int line)
641 {
642  int r = get_bits(s, n);
643 
644  print_bin(r, n);
645  av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d bit @%5d in %s %s:%d\n",
646  r, n, r, get_bits_count(s) - n, file, func, line);
647 
648  return r;
649 }
650 
651 static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2],
652  int bits, int max_depth, const char *file,
653  const char *func, int line)
654 {
655  int show = show_bits(s, 24);
656  int pos = get_bits_count(s);
657  int r = get_vlc2(s, table, bits, max_depth);
658  int len = get_bits_count(s) - pos;
659  int bits2 = show >> (24 - len);
660 
661  print_bin(bits2, len);
662 
663  av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d vlc @%5d in %s %s:%d\n",
664  bits2, len, r, pos, file, func, line);
665 
666  return r;
667 }
668 
669 #define GET_RL_VLC(level, run, name, gb, table, bits, \
670  max_depth, need_update) \
671  do { \
672  int show = SHOW_UBITS(name, gb, 24); \
673  int len; \
674  int pos = name ## _index; \
675  \
676  GET_RL_VLC_INTERNAL(level, run, name, gb, table, bits,max_depth, need_update); \
677  \
678  len = name ## _index - pos + 1; \
679  show = show >> (24 - len); \
680  \
681  print_bin(show, len); \
682  \
683  av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d/%-3d rlv @%5d in %s %s:%d\n",\
684  show, len, run-1, level, pos, __FILE__, __PRETTY_FUNCTION__, __LINE__);\
685  } while (0) \
686 
687 
688 static inline int get_xbits_trace(GetBitContext *s, int n, const char *file,
689  const char *func, int line)
690 {
691  int show = show_bits(s, n);
692  int r = get_xbits(s, n);
693 
694  print_bin(show, n);
695  av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d xbt @%5d in %s %s:%d\n",
696  show, n, r, get_bits_count(s) - n, file, func, line);
697 
698  return r;
699 }
700 
701 #define get_bits(s, n) get_bits_trace(s , n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
702 #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
703 #define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
704 
705 #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
706 #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
707 #else //TRACE
708 #define GET_RL_VLC GET_RL_VLC_INTERNAL
709 #endif
710 
711 #endif /* AVCODEC_GET_BITS_H */
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:391
static unsigned int show_bits1(GetBitContext *s)
Definition: get_bits.h:332
#define NULL
Definition: coverity.c:32
int table_size
Definition: get_bits.h:66
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:217
const uint8_t * buffer
Definition: get_bits.h:55
#define VLC_TYPE
Definition: get_bits.h:61
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:245
static int get_sbits_long(GetBitContext *s, int n)
Read 0-32 bits as a signed integer.
Definition: get_bits.h:383
uint8_t bits
Definition: crc.c:296
uint8_t
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:63
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:212
static const uint8_t bits2[81]
Definition: aactab.c:130
#define SHOW_UBITS_LE(name, gb, num)
Definition: get_bits.h:196
#define av_log(a,...)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:607
static uint64_t get_bits64(GetBitContext *s, int n)
Read 0-64 bits.
Definition: get_bits.h:365
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:173
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:360
static const struct endianess table[]
const char * r
Definition: vf_curves.c:107
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
Definition: graph2dot.c:48
simple assert() macros that are a bit more flexible than ISO C assert().
#define CLOSE_READER(name, gb)
Definition: get_bits.h:144
int8_t len
Definition: get_bits.h:71
static int check_marker(GetBitContext *s, const char *msg)
Definition: get_bits.h:401
Definition: get_bits.h:63
int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, const void *symbols, int symbols_wrap, int symbols_size, int flags)
Definition: bitstream.c:275
#define NEG_USR32(a, s)
Definition: mathops.h:175
int size_in_bits
Definition: get_bits.h:57
int32_t
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:295
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:194
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:574
int n
Definition: avisynth_c.h:547
#define GET_VLC(code, name, gb, table, bits, max_depth)
If the vlc code is invalid and max_depth=1, then no bits will be removed.
Definition: get_bits.h:497
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:206
static int decode210(GetBitContext *gb)
Definition: get_bits.h:599
int bits
Definition: get_bits.h:64
int table_allocated
Definition: get_bits.h:66
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
int size_in_bits_plus8
Definition: get_bits.h:58
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:449
static int get_xbits(GetBitContext *s, int n)
read mpeg1 dc style vlc (sign bit + mantissa with no MSB).
Definition: get_bits.h:231
#define OPEN_READER(name, gb)
Definition: get_bits.h:133
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:312
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:337
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:305
int index
Definition: gxfenc.c:89
#define UPDATE_CACHE_LE(name, gb)
Definition: get_bits.h:156
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:418
#define GET_CACHE(name, gb)
Definition: get_bits.h:210
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:67
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:345
#define MIN_CACHE_BITS
Definition: get_bits.h:125
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:139
static unsigned int get_bits_le(GetBitContext *s, int n)
Definition: get_bits.h:280
static int flags
Definition: cpu.c:47
uint8_t run
Definition: get_bits.h:72
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:207
#define OPEN_READER_NOSIZE(name, gb)
Definition: get_bits.h:128
common internal and external API header
const uint8_t * buffer_end
Definition: get_bits.h:55
float re
Definition: fft-test.c:73
int len
static int decode012(GetBitContext *gb)
Definition: get_bits.h:589
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:457
int16_t level
Definition: get_bits.h:70
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:612
#define av_always_inline
Definition: attributes.h:39
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
Definition: get_bits.h:275
GLuint buffer
Definition: opengl_enc.c:102