26 #ifndef AVCODEC_GET_BITS_H
27 #define AVCODEC_GET_BITS_H
51 #ifndef UNCHECKED_BITSTREAM_READER
52 #define UNCHECKED_BITSTREAM_READER !CONFIG_SAFE_BITSTREAM_READER
62 #define VLC_TYPE int16_t
123 #ifdef LONG_BITSTREAM_READER
124 # define MIN_CACHE_BITS 32
126 # define MIN_CACHE_BITS 25
129 #define OPEN_READER_NOSIZE(name, gb) \
130 unsigned int name ## _index = (gb)->index; \
131 unsigned int av_unused name ## _cache
133 #if UNCHECKED_BITSTREAM_READER
134 #define OPEN_READER(name, gb) OPEN_READER_NOSIZE(name, gb)
136 #define BITS_AVAILABLE(name, gb) 1
138 #define OPEN_READER(name, gb) \
139 OPEN_READER_NOSIZE(name, gb); \
140 unsigned int name ## _size_plus8 = (gb)->size_in_bits_plus8
142 #define BITS_AVAILABLE(name, gb) name ## _index < name ## _size_plus8
145 #define CLOSE_READER(name, gb) (gb)->index = name ## _index
147 # ifdef LONG_BITSTREAM_READER
149 # define UPDATE_CACHE_LE(name, gb) name ## _cache = \
150 AV_RL64((gb)->buffer + (name ## _index >> 3)) >> (name ## _index & 7)
152 # define UPDATE_CACHE_BE(name, gb) name ## _cache = \
153 AV_RB64((gb)->buffer + (name ## _index >> 3)) >> (32 - (name ## _index & 7))
157 # define UPDATE_CACHE_LE(name, gb) name ## _cache = \
158 AV_RL32((gb)->buffer + (name ## _index >> 3)) >> (name ## _index & 7)
160 # define UPDATE_CACHE_BE(name, gb) name ## _cache = \
161 AV_RB32((gb)->buffer + (name ## _index >> 3)) << (name ## _index & 7)
166 #ifdef BITSTREAM_READER_LE
168 # define UPDATE_CACHE(name, gb) UPDATE_CACHE_LE(name, gb)
170 # define SKIP_CACHE(name, gb, num) name ## _cache >>= (num)
174 # define UPDATE_CACHE(name, gb) UPDATE_CACHE_BE(name, gb)
176 # define SKIP_CACHE(name, gb, num) name ## _cache <<= (num)
180 #if UNCHECKED_BITSTREAM_READER
181 # define SKIP_COUNTER(name, gb, num) name ## _index += (num)
183 # define SKIP_COUNTER(name, gb, num) \
184 name ## _index = FFMIN(name ## _size_plus8, name ## _index + (num))
187 #define BITS_LEFT(name, gb) ((int)((gb)->size_in_bits - name ## _index))
189 #define SKIP_BITS(name, gb, num) \
191 SKIP_CACHE(name, gb, num); \
192 SKIP_COUNTER(name, gb, num); \
195 #define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
197 #define SHOW_UBITS_LE(name, gb, num) zero_extend(name ## _cache, num)
198 #define SHOW_SBITS_LE(name, gb, num) sign_extend(name ## _cache, num)
200 #define SHOW_UBITS_BE(name, gb, num) NEG_USR32(name ## _cache, num)
201 #define SHOW_SBITS_BE(name, gb, num) NEG_SSR32(name ## _cache, num)
203 #ifdef BITSTREAM_READER_LE
204 # define SHOW_UBITS(name, gb, num) SHOW_UBITS_LE(name, gb, num)
205 # define SHOW_SBITS(name, gb, num) SHOW_SBITS_LE(name, gb, num)
207 # define SHOW_UBITS(name, gb, num) SHOW_UBITS_BE(name, gb, num)
208 # define SHOW_SBITS(name, gb, num) SHOW_SBITS_BE(name, gb, num)
211 #define GET_CACHE(name, gb) ((uint32_t) name ## _cache)
220 #if UNCHECKED_BITSTREAM_READER
243 return (
NEG_USR32(sign ^ cache, n) ^ sign) - sign;
309 #ifdef BITSTREAM_READER_LE
310 result >>= index & 7;
313 result <<= index & 7;
316 #if !UNCHECKED_BITSTREAM_READER
345 #ifdef BITSTREAM_READER_LE
347 return ret | (
get_bits(s, n - 16) << 16);
349 unsigned ret =
get_bits(s, 16) << (n - 16);
363 #ifdef BITSTREAM_READER_LE
427 buffer_size = (bit_size + 7) >> 3;
449 if (byte_size > INT_MAX / 8 || byte_size < 0)
462 #define init_vlc(vlc, nb_bits, nb_codes, \
463 bits, bits_wrap, bits_size, \
464 codes, codes_wrap, codes_size, \
466 ff_init_vlc_sparse(vlc, nb_bits, nb_codes, \
467 bits, bits_wrap, bits_size, \
468 codes, codes_wrap, codes_size, \
472 const void *
bits,
int bits_wrap,
int bits_size,
473 const void *codes,
int codes_wrap,
int codes_size,
474 const void *symbols,
int symbols_wrap,
int symbols_size,
478 #define INIT_VLC_LE 2
479 #define INIT_VLC_USE_NEW_STATIC 4
481 #define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size) \
483 static VLC_TYPE table[static_size][2]; \
484 (vlc)->table = table; \
485 (vlc)->table_allocated = static_size; \
486 init_vlc(vlc, bits, a, b, c, d, e, f, g, INIT_VLC_USE_NEW_STATIC); \
494 #define GET_VLC(code, name, gb, table, bits, max_depth) \
497 unsigned int index; \
499 index = SHOW_UBITS(name, gb, bits); \
500 code = table[index][0]; \
501 n = table[index][1]; \
503 if (max_depth > 1 && n < 0) { \
504 LAST_SKIP_BITS(name, gb, bits); \
505 UPDATE_CACHE(name, gb); \
509 index = SHOW_UBITS(name, gb, nb_bits) + code; \
510 code = table[index][0]; \
511 n = table[index][1]; \
512 if (max_depth > 2 && n < 0) { \
513 LAST_SKIP_BITS(name, gb, nb_bits); \
514 UPDATE_CACHE(name, gb); \
518 index = SHOW_UBITS(name, gb, nb_bits) + code; \
519 code = table[index][0]; \
520 n = table[index][1]; \
523 SKIP_BITS(name, gb, n); \
526 #define GET_RL_VLC_INTERNAL(level, run, name, gb, table, bits, \
527 max_depth, need_update) \
530 unsigned int index; \
532 index = SHOW_UBITS(name, gb, bits); \
533 level = table[index].level; \
534 n = table[index].len; \
536 if (max_depth > 1 && n < 0) { \
537 SKIP_BITS(name, gb, bits); \
539 UPDATE_CACHE(name, gb); \
544 index = SHOW_UBITS(name, gb, nb_bits) + level; \
545 level = table[index].level; \
546 n = table[index].len; \
548 run = table[index].run; \
549 SKIP_BITS(name, gb, n); \
562 int bits,
int max_depth)
616 static inline void print_bin(
int bits,
int n)
620 for (i = n - 1; i >= 0; i--)
622 for (i = n; i < 24; i++)
626 static inline int get_bits_trace(
GetBitContext *s,
int n,
const char *file,
639 int bits,
int max_depth,
const char *file,
640 const char *func,
int line)
648 print_bin(bits2, len);
651 bits2, len, r, pos, file, func, line);
656 #define GET_RL_VLC(level, run, name, gb, table, bits, \
657 max_depth, need_update) \
659 int show = SHOW_UBITS(name, gb, 24); \
661 int pos = name ## _index; \
663 GET_RL_VLC_INTERNAL(level, run, name, gb, table, bits,max_depth, need_update); \
665 len = name ## _index - pos + 1; \
666 show = show >> (24 - len); \
668 print_bin(show, len); \
670 av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d/%-3d rlv @%5d in %s %s:%d\n",\
671 show, len, run-1, level, pos, __FILE__, __PRETTY_FUNCTION__, __LINE__);\
675 static inline int get_xbits_trace(
GetBitContext *s,
int n,
const char *file,
676 const char *func,
int line)
688 #define get_bits(s, n) get_bits_trace(s , n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
689 #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__)
690 #define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__)
692 #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__)
693 #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__)
695 #define GET_RL_VLC GET_RL_VLC_INTERNAL
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
static unsigned int show_bits1(GetBitContext *s)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
static void skip_bits_long(GetBitContext *s, int n)
static int get_sbits(GetBitContext *s, int n)
static int get_sbits_long(GetBitContext *s, int n)
Read 0-32 bits as a signed integer.
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
static int get_bits_count(const GetBitContext *s)
static const uint8_t bits2[81]
#define SHOW_UBITS_LE(name, gb, num)
static int get_bits_left(GetBitContext *gb)
static uint64_t get_bits64(GetBitContext *s, int n)
Read 0-64 bits.
#define UPDATE_CACHE(name, gb)
void ff_free_vlc(VLC *vlc)
static const struct endianess table[]
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
simple assert() macros that are a bit more flexible than ISO C assert().
#define CLOSE_READER(name, gb)
Libavcodec external API header.
static int check_marker(GetBitContext *s, const char *msg)
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)
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
#define LAST_SKIP_BITS(name, gb, num)
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
#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.
#define SHOW_UBITS(name, gb, num)
static int decode210(GetBitContext *gb)
#define AV_LOG_INFO
Standard information.
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
static int get_xbits(GetBitContext *s, int n)
read mpeg1 dc style vlc (sign bit + mantissa with no MSB).
#define OPEN_READER(name, gb)
static unsigned int get_bits1(GetBitContext *s)
static void skip_bits1(GetBitContext *s)
static void skip_bits(GetBitContext *s, int n)
#define UPDATE_CACHE_LE(name, gb)
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
#define GET_CACHE(name, gb)
int(* func)(AVBPrint *dst, const char *in, const char *arg)
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
static av_const int sign_extend(int val, unsigned bits)
static unsigned int get_bits_le(GetBitContext *s, int n)
#define SHOW_SBITS(name, gb, num)
#define OPEN_READER_NOSIZE(name, gb)
common internal and external API header
const uint8_t * buffer_end
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
static int decode012(GetBitContext *gb)
VLC_TYPE(* table)[2]
code, bits
static const uint8_t * align_get_bits(GetBitContext *s)
static int skip_1stop_8data_bits(GetBitContext *gb)