mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-10-31 12:36:41 +08:00
9cdf82c2c2
Therefore use a proper prefix for this API, e.g.
ff_init_vlc_sparse -> ff_vlc_init_sparse
ff_free_vlc -> ff_vlc_free
INIT_VLC_LE -> VLC_INIT_LE
INIT_VLC_USE_NEW_STATIC -> VLC_INIT_USE_STATIC
(The ancient INIT_VLC_USE_STATIC has been removed
in 595324e143, so that
the NEW has been dropped.)
Finally, reorder the flags and change their values
accordingly.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
227 lines
11 KiB
C
227 lines
11 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_VLC_H
|
|
#define AVCODEC_VLC_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#define VLC_MULTI_MAX_SYMBOLS 6
|
|
|
|
// When changing this, be sure to also update tableprint_vlc.h accordingly.
|
|
typedef int16_t VLCBaseType;
|
|
|
|
typedef struct VLCElem {
|
|
VLCBaseType sym, len;
|
|
} VLCElem;
|
|
|
|
typedef struct VLC {
|
|
int bits;
|
|
VLCElem *table;
|
|
int table_size, table_allocated;
|
|
} VLC;
|
|
|
|
typedef struct VLC_MULTI_ELEM {
|
|
uint8_t val[VLC_MULTI_MAX_SYMBOLS];
|
|
int8_t len; // -31,32
|
|
uint8_t num;
|
|
} VLC_MULTI_ELEM;
|
|
|
|
typedef struct VLC_MULTI {
|
|
VLC_MULTI_ELEM *table;
|
|
int table_size, table_allocated;
|
|
} VLC_MULTI;
|
|
|
|
typedef struct RL_VLC_ELEM {
|
|
int16_t level;
|
|
int8_t len;
|
|
uint8_t run;
|
|
} RL_VLC_ELEM;
|
|
|
|
#define vlc_init(vlc, nb_bits, nb_codes, \
|
|
bits, bits_wrap, bits_size, \
|
|
codes, codes_wrap, codes_size, \
|
|
flags) \
|
|
ff_vlc_init_sparse(vlc, nb_bits, nb_codes, \
|
|
bits, bits_wrap, bits_size, \
|
|
codes, codes_wrap, codes_size, \
|
|
NULL, 0, 0, flags)
|
|
|
|
/**
|
|
* Build VLC decoding tables suitable for use with get_vlc2().
|
|
*
|
|
* @param[in,out] vlc The VLC to be initialized; table and table_allocated
|
|
* must have been set when initializing a static VLC,
|
|
* otherwise this will be treated as uninitialized.
|
|
* @param[in] nb_bits The number of bits to use for the VLC table;
|
|
* higher values take up more memory and cache, but
|
|
* allow to read codes with fewer reads.
|
|
* Corresponds to the `bits` parameter of get_vlc2().
|
|
* @param[in] nb_codes The number of provided bits, codes and (if supplied)
|
|
* symbol entries.
|
|
* @param[in] bits The lengths (in bits) of the codes. Entries > 0
|
|
* correspond to valid codes; entries == 0 will be skipped.
|
|
* @param[in] bits_wrap Stride (in bytes) of the bits table.
|
|
* @param[in] codes_size Size of the bits. 1, 2 and 4 are supported.
|
|
* @param[in] codes Table which gives the bit pattern of of each vlc code.
|
|
* @param[in] codes_wrap Stride (in bytes) of the codes table.
|
|
* @param[in] codes_size Size of the codes. 1, 2 and 4 are supported.
|
|
* @param[in] symbols The symbols, i.e. what is returned from get_vlc2()
|
|
* when the corresponding code is encountered.
|
|
* May be NULL, then 0, 1, 2, 3, 4,... will be used.
|
|
* @param[in] symbols_wrap Stride (in bytes) of the symbols table.
|
|
* @param[in] symbols_size Size of the symbols. 1 and 2 are supported.
|
|
* @param[in] flags A combination of the VLC_INIT_* flags.
|
|
*
|
|
* 'wrap' and 'size' make it possible to use any memory configuration and types
|
|
* (byte/word/int) to store the 'bits', 'codes', and 'symbols' tables.
|
|
*/
|
|
int ff_vlc_init_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);
|
|
|
|
/**
|
|
* Build VLC decoding tables suitable for use with get_vlc2()
|
|
*
|
|
* This function takes lengths and symbols and calculates the codes from them.
|
|
* For this the input lengths and symbols have to be sorted according to "left
|
|
* nodes in the corresponding tree first".
|
|
*
|
|
* @param[in,out] vlc The VLC to be initialized; table and table_allocated
|
|
* must have been set when initializing a static VLC,
|
|
* otherwise this will be treated as uninitialized.
|
|
* @param[in] nb_bits The number of bits to use for the VLC table;
|
|
* higher values take up more memory and cache, but
|
|
* allow to read codes with fewer reads.
|
|
* @param[in] nb_codes The number of provided length and (if supplied) symbol
|
|
* entries.
|
|
* @param[in] lens The lengths of the codes. Entries > 0 correspond to
|
|
* valid codes; entries == 0 will be skipped and entries
|
|
* with len < 0 indicate that the tree is incomplete and
|
|
* has an open end of length -len at this position.
|
|
* @param[in] lens_wrap Stride (in bytes) of the lengths.
|
|
* @param[in] symbols The symbols, i.e. what is returned from get_vlc2()
|
|
* when the corresponding code is encountered.
|
|
* May be NULL, then 0, 1, 2, 3, 4,... will be used.
|
|
* @param[in] symbols_wrap Stride (in bytes) of the symbols.
|
|
* @param[in] symbols_size Size of the symbols. 1 and 2 are supported.
|
|
* @param[in] offset An offset to apply to all the valid symbols.
|
|
* @param[in] flags A combination of the VLC_INIT_* flags; notice that
|
|
* VLC_INIT_INPUT_LE is pointless and ignored.
|
|
*/
|
|
int ff_vlc_init_from_lengths(VLC *vlc, int nb_bits, int nb_codes,
|
|
const int8_t *lens, int lens_wrap,
|
|
const void *symbols, int symbols_wrap, int symbols_size,
|
|
int offset, int flags, void *logctx);
|
|
|
|
/**
|
|
* Build VLC decoding tables suitable for use with get_vlc_multi()
|
|
*
|
|
* This function takes lengths and symbols and calculates the codes from them.
|
|
* For this the input lengths and symbols have to be sorted according to "left
|
|
* nodes in the corresponding tree first".
|
|
*
|
|
* @param[in,out] vlc The VLC to be initialized; table and table_allocated
|
|
* must have been set when initializing a static VLC,
|
|
* otherwise this will be treated as uninitialized.
|
|
* @param[in,out] multi The VLC_MULTI to be initialized; table and table_allocated
|
|
* must have been set when initializing a static VLC,
|
|
* otherwise this will be treated as uninitialized.
|
|
* @param[in] nb_bits The number of bits to use for the VLC table;
|
|
* higher values take up more memory and cache, but
|
|
* allow to read codes with fewer reads.
|
|
* @param[in] nb_elems The max possible number of elements.
|
|
* @param[in] nb_codes The number of provided length and (if supplied) symbol
|
|
* entries.
|
|
* @param[in] lens The lengths of the codes. Entries > 0 correspond to
|
|
* valid codes; entries == 0 will be skipped and entries
|
|
* with len < 0 indicate that the tree is incomplete and
|
|
* has an open end of length -len at this position.
|
|
* @param[in] lens_wrap Stride (in bytes) of the lengths.
|
|
* @param[in] symbols The symbols, i.e. what is returned from get_vlc2()
|
|
* when the corresponding code is encountered.
|
|
* May be NULL, then 0, 1, 2, 3, 4,... will be used.
|
|
* @param[in] symbols_wrap Stride (in bytes) of the symbols.
|
|
* @param[in] symbols_size Size of the symbols. 1 and 2 are supported.
|
|
* @param[in] offset An offset to apply to all the valid symbols.
|
|
* @param[in] flags A combination of the VLC_INIT_* flags; notice that
|
|
* VLC_INIT_INPUT_LE is pointless and ignored.
|
|
*/
|
|
int ff_vlc_init_multi_from_lengths(VLC *vlc, VLC_MULTI *multi, int nb_bits, int nb_elems,
|
|
int nb_codes, const int8_t *lens, int lens_wrap,
|
|
const void *symbols, int symbols_wrap, int symbols_size,
|
|
int offset, int flags, void *logctx);
|
|
|
|
|
|
void ff_vlc_free_multi(VLC_MULTI *vlc);
|
|
void ff_vlc_free(VLC *vlc);
|
|
|
|
#define VLC_INIT_USE_STATIC 1
|
|
#define VLC_INIT_STATIC_OVERLONG (2 | VLC_INIT_USE_STATIC)
|
|
/* If VLC_INIT_INPUT_LE is set, the LSB bit of the codes used to
|
|
* initialize the VLC table is the first bit to be read. */
|
|
#define VLC_INIT_INPUT_LE 4
|
|
/* If set the VLC is intended for a little endian bitstream reader. */
|
|
#define VLC_INIT_OUTPUT_LE 8
|
|
#define VLC_INIT_LE (VLC_INIT_INPUT_LE | VLC_INIT_OUTPUT_LE)
|
|
|
|
#define VLC_INIT_CUSTOM_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, \
|
|
h, i, j, flags, static_size) \
|
|
do { \
|
|
static VLCElem table[static_size]; \
|
|
(vlc)->table = table; \
|
|
(vlc)->table_allocated = static_size; \
|
|
ff_vlc_init_sparse(vlc, bits, a, b, c, d, e, f, g, h, i, j, \
|
|
flags | VLC_INIT_USE_STATIC); \
|
|
} while (0)
|
|
|
|
#define VLC_INIT_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, h, i, j, static_size) \
|
|
VLC_INIT_CUSTOM_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, \
|
|
h, i, j, 0, static_size)
|
|
|
|
#define VLC_INIT_LE_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, h, i, j, static_size) \
|
|
VLC_INIT_CUSTOM_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, \
|
|
h, i, j, VLC_INIT_LE, static_size)
|
|
|
|
#define VLC_INIT_CUSTOM_STATIC(vlc, bits, a, b, c, d, e, f, g, flags, static_size) \
|
|
VLC_INIT_CUSTOM_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, \
|
|
NULL, 0, 0, flags, static_size)
|
|
|
|
#define VLC_INIT_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size) \
|
|
VLC_INIT_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, NULL, 0, 0, static_size)
|
|
|
|
#define VLC_INIT_LE_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size) \
|
|
VLC_INIT_LE_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, NULL, 0, 0, static_size)
|
|
|
|
#define VLC_INIT_STATIC_FROM_LENGTHS(vlc, bits, nb_codes, lens, len_wrap, \
|
|
symbols, symbols_wrap, symbols_size, \
|
|
offset, flags, static_size) \
|
|
do { \
|
|
static VLCElem table[static_size]; \
|
|
(vlc)->table = table; \
|
|
(vlc)->table_allocated = static_size; \
|
|
ff_vlc_init_from_lengths(vlc, bits, nb_codes, lens, len_wrap, \
|
|
symbols, symbols_wrap, symbols_size, \
|
|
offset, flags | VLC_INIT_USE_STATIC, \
|
|
NULL); \
|
|
} while (0)
|
|
|
|
#endif /* AVCODEC_VLC_H */
|