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1 | /* |
2 | * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder | |
3 | * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * Context Adaptive Binary Arithmetic Coder. | |
25 | */ | |
26 | ||
27 | #ifndef AVCODEC_CABAC_H | |
28 | #define AVCODEC_CABAC_H | |
29 | ||
30 | #include <stdint.h> | |
31 | ||
32 | #include "put_bits.h" | |
33 | ||
34 | #if CONFIG_HARDCODED_TABLES | |
35 | #define CABAC_TABLE_CONST const | |
36 | #else | |
37 | #define CABAC_TABLE_CONST | |
38 | #endif | |
39 | extern CABAC_TABLE_CONST uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63]; | |
40 | #define H264_NORM_SHIFT_OFFSET 0 | |
41 | #define H264_LPS_RANGE_OFFSET 512 | |
42 | #define H264_MLPS_STATE_OFFSET 1024 | |
43 | #define H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET 1280 | |
44 | ||
45 | #define CABAC_BITS 16 | |
46 | #define CABAC_MASK ((1<<CABAC_BITS)-1) | |
47 | ||
48 | typedef struct CABACContext{ | |
49 | int low; | |
50 | int range; | |
51 | int outstanding_count; | |
52 | const uint8_t *bytestream_start; | |
53 | const uint8_t *bytestream; | |
54 | const uint8_t *bytestream_end; | |
55 | PutBitContext pb; | |
56 | }CABACContext; | |
57 | ||
58 | void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size); | |
59 | void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size); | |
60 | void ff_init_cabac_states(void); | |
61 | ||
62 | #endif /* AVCODEC_CABAC_H */ |