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libavcodec
cabac.h
Go to the documentation of this file.
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/*
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* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Context Adaptive Binary Arithmetic Coder.
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*/
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#ifndef AVCODEC_CABAC_H
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#define AVCODEC_CABAC_H
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#include <stdint.h>
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#include "
put_bits.h
"
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#if CONFIG_HARDCODED_TABLES
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#define CABAC_TABLE_CONST const
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#else
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#define CABAC_TABLE_CONST
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#endif
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extern
CABAC_TABLE_CONST
uint8_t
ff_h264_cabac_tables
[512 + 4*2*64 + 4*64 + 63];
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#define H264_NORM_SHIFT_OFFSET 0
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#define H264_LPS_RANGE_OFFSET 512
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#define H264_MLPS_STATE_OFFSET 1024
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#define H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET 1280
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#define CABAC_BITS 16
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#define CABAC_MASK ((1<<CABAC_BITS)-1)
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typedef
struct
CABACContext
{
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int
low
;
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int
range
;
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int
outstanding_count
;
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const
uint8_t
*
bytestream_start
;
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const
uint8_t
*
bytestream
;
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const
uint8_t
*
bytestream_end
;
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PutBitContext
pb
;
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}
CABACContext
;
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void
ff_init_cabac_encoder
(
CABACContext
*
c
,
uint8_t
*
buf
,
int
buf_size);
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void
ff_init_cabac_decoder
(
CABACContext
*
c
,
const
uint8_t
*
buf
,
int
buf_size);
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void
ff_init_cabac_states
(
void
);
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#endif
/* AVCODEC_CABAC_H */
ff_h264_cabac_tables
CABAC_TABLE_CONST uint8_t ff_h264_cabac_tables[512+4 *2 *64+4 *64+63]
Definition:
cabac_tablegen.h:30
PutBitContext
Definition:
put_bits.h:35
CABACContext::bytestream_end
const uint8_t * bytestream_end
Definition:
cabac.h:54
ff_init_cabac_encoder
void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size)
Definition:
cabac.c:41
CABACContext::bytestream
const uint8_t * bytestream
Definition:
cabac.h:53
uint8_t
uint8_t
Definition:
audio_convert.c:194
ff_init_cabac_states
void ff_init_cabac_states(void)
Definition:
cabac.c:69
CABACContext
Definition:
cabac.h:48
CABACContext::bytestream_start
const uint8_t * bytestream_start
Definition:
cabac.h:52
CABACContext::outstanding_count
int outstanding_count
Definition:
cabac.h:51
buf
void * buf
Definition:
avisynth_c.h:553
CABACContext::range
int range
Definition:
cabac.h:50
CABACContext::pb
PutBitContext pb
Definition:
cabac.h:55
CABACContext::low
int low
Definition:
cabac.h:49
c
static double c[64]
Definition:
vsrc_mptestsrc.c:87
CABAC_TABLE_CONST
#define CABAC_TABLE_CONST
Definition:
cabac.h:37
ff_init_cabac_decoder
void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size)
Definition:
cabac.c:54
put_bits.h
bitstream writer API
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