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cabac.h
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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 extern const uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63];
35 #define H264_NORM_SHIFT_OFFSET 0
36 #define H264_LPS_RANGE_OFFSET 512
37 #define H264_MLPS_STATE_OFFSET 1024
38 #define H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET 1280
39 
40 #define CABAC_BITS 16
41 #define CABAC_MASK ((1<<CABAC_BITS)-1)
42 
43 typedef struct CABACContext{
44  int low;
45  int range;
52 
53 void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size);
54 int ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size);
55 
56 #endif /* AVCODEC_CABAC_H */
const uint8_t * bytestream_end
Definition: cabac.h:49
void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size)
Definition: cabac.c:164
const uint8_t * bytestream
Definition: cabac.h:48
uint8_t
const uint8_t * bytestream_start
Definition: cabac.h:47
int outstanding_count
Definition: cabac.h:46
void * buf
Definition: avisynth_c.h:690
int range
Definition: cabac.h:45
PutBitContext pb
Definition: cabac.h:50
int low
Definition: cabac.h:44
const uint8_t ff_h264_cabac_tables[512+4 *2 *64+4 *64+63]
Definition: cabac.c:35
static AVCodec * c
int ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size)
Definition: cabac.c:177
bitstream writer API