FFmpeg
vlc.h
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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
30 } VLC;
31 
32 typedef struct RL_VLC_ELEM {
33  int16_t level;
34  int8_t len;
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 */
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:359
int table_size
Definition: vlc.h:29
uint8_t
int8_t len
Definition: vlc.h:34
Definition: vlc.h:26
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:273
int bits
Definition: vlc.h:27
int table_allocated
Definition: vlc.h:29
#define flags(name, subs,...)
Definition: cbs_av1.c:561
uint8_t run
Definition: vlc.h:35
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
int16_t level
Definition: vlc.h:33
#define VLC_TYPE
Definition: vlc.h:24