git.sesse.net Git - ffmpeg/blob - libavcodec/vlc.h

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #ifndef AVCODEC_VLC_H
  20 #define AVCODEC_VLC_H
  21
  22 #include <stdint.h>
  23
  24 #define VLC_TYPE int16_t
  25
  26 typedef struct VLC {
  27     int bits;
  28     VLC_TYPE (*table)[2]; ///< code, bits
  29     int table_size, table_allocated;
  30 } VLC;
  31
  32 typedef struct RL_VLC_ELEM {
  33     int16_t level;
  34     int8_t len;
  35     uint8_t run;
  36 } RL_VLC_ELEM;
  37
  38 #define init_vlc(vlc, nb_bits, nb_codes,                \
  39                  bits, bits_wrap, bits_size,            \
  40                  codes, codes_wrap, codes_size,         \
  41                  flags)                                 \
  42     ff_init_vlc_sparse(vlc, nb_bits, nb_codes,          \
  43                        bits, bits_wrap, bits_size,      \
  44                        codes, codes_wrap, codes_size,   \
  45                        NULL, 0, 0, flags)
  46
  47 int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
  48                        const void *bits, int bits_wrap, int bits_size,
  49                        const void *codes, int codes_wrap, int codes_size,
  50                        const void *symbols, int symbols_wrap, int symbols_size,
  51                        int flags);
  52 void ff_free_vlc(VLC *vlc);
  53
  54 #define INIT_VLC_LE             2
  55 #define INIT_VLC_USE_NEW_STATIC 4
  56
  57 #define INIT_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, h, i, j, static_size) \
  58     do {                                                                   \
  59         static VLC_TYPE table[static_size][2];                             \
  60         (vlc)->table           = table;                                    \
  61         (vlc)->table_allocated = static_size;                              \
  62         ff_init_vlc_sparse(vlc, bits, a, b, c, d, e, f, g, h, i, j,        \
  63             INIT_VLC_USE_NEW_STATIC);                                      \
  64     } while (0)
  65
  66 #define INIT_LE_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, h, i, j, static_size) \
  67     do {                                                                   \
  68         static VLC_TYPE table[static_size][2];                             \
  69         (vlc)->table           = table;                                    \
  70         (vlc)->table_allocated = static_size;                              \
  71         ff_init_vlc_sparse(vlc, bits, a, b, c, d, e, f, g, h, i, j,        \
  72             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);                        \
  73     } while (0)
  74
  75 #define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)       \
  76     INIT_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, NULL, 0, 0, static_size)
  77
  78 #define INIT_LE_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size) \
  79     INIT_LE_VLC_SPARSE_STATIC(vlc, bits, a, b, c, d, e, f, g, NULL, 0, 0, static_size)
  80
  81 #endif /* AVCODEC_VLC_H */