libavcodec/cabac.h File Reference

Context Adaptive Binary Arithmetic Coder. More...

#include "bitstream.h"
#include <assert.h>
#include "libavutil/x86_cpu.h"

Go to the source code of this file.

Data Structures
struct	CABACContext
Defines
#define	CABAC_BITS   16
#define	CABAC_MASK   ((1<<CABAC_BITS)-1)
#define	BRANCHLESS_CABAC_DECODER   1
#define	LOW   "0"
#define	RANGE   "4"
#define	BYTESTART   "12"
#define	BYTE   "16"
#define	BYTEEND   "20"
Functions
void	ff_init_cabac_encoder (CABACContext *c, uint8_t *buf, int buf_size)
void	ff_init_cabac_decoder (CABACContext *c, const uint8_t *buf, int buf_size)
void	ff_init_cabac_states (CABACContext *c)
static void	put_cabac_bit (CABACContext *c, int b)
static void	renorm_cabac_encoder (CABACContext *c)
static void	refill (CABACContext *c)
static void	refill2 (CABACContext *c)
static void	renorm_cabac_decoder (CABACContext *c)
static void	renorm_cabac_decoder_once (CABACContext *c)
static av_always_inline int	get_cabac_inline (CABACContext *c, uint8_t *const state)
static int av_noinline av_unused	get_cabac_noinline (CABACContext *c, uint8_t *const state)
static int av_unused	get_cabac (CABACContext *c, uint8_t *const state)
static int av_unused	get_cabac_bypass (CABACContext *c)
static av_always_inline int	get_cabac_bypass_sign (CABACContext *c, int val)
static int av_unused	get_cabac_terminate (CABACContext *c)
Variables
uint8_t	ff_h264_mlps_state [4 *64]
uint8_t	ff_h264_lps_range [4 *2 *64]
	rangeTabLPS
uint8_t	ff_h264_mps_state [2 *64]
	transIdxMPS
uint8_t	ff_h264_lps_state [2 *64]
	transIdxLPS
const uint8_t	ff_h264_norm_shift [512]

---

Detailed Description

Context Adaptive Binary Arithmetic Coder.

Definition in file cabac.h.

---

Define Documentation

#define BRANCHLESS_CABAC_DECODER   1

Definition at line 38 of file cabac.h.

#define BYTE   "16"

Referenced by get_cabac_bypass(), get_cabac_bypass_sign(), and get_cabac_inline().

#define BYTEEND   "20"

#define BYTESTART   "12"

#define CABAC_BITS   16

Definition at line 36 of file cabac.h.

Referenced by decode_mb_cabac(), get_cabac_bypass(), get_cabac_bypass_sign(), get_cabac_inline(), get_cabac_terminate(), refill(), and refill2().

#define CABAC_MASK   ((1<<CABAC_BITS)-1)

Definition at line 37 of file cabac.h.

Referenced by get_cabac_bypass(), get_cabac_bypass_sign(), get_cabac_inline(), refill(), refill2(), renorm_cabac_decoder(), and renorm_cabac_decoder_once().

#define LOW   "0"

Referenced by Faac_encode_init(), get_cabac_bypass(), get_cabac_bypass_sign(), and get_cabac_inline().

#define RANGE   "4"

Referenced by get_cabac_bypass(), get_cabac_bypass_sign(), and get_cabac_inline().

---

Function Documentation

void ff_init_cabac_decoder	(	CABACContext *	c,
		const uint8_t *	buf,
		int	buf_size
	)

Parameters:

buf_size

size of buf in bits

Definition at line 134 of file cabac.c.

Referenced by decode_mb_cabac(), and decode_slice().

void ff_init_cabac_encoder	(	CABACContext *	c,
		uint8_t *	buf,
		int	buf_size
	)

Parameters:

buf_size

size of buf in bits

Definition at line 117 of file cabac.c.

void ff_init_cabac_states

(

CABACContext *

c

)

Definition at line 149 of file cabac.c.

Referenced by decode_slice().

static int av_unused get_cabac	(	CABACContext *	c,
		uint8_t *const	state
	)			[static]

Definition at line 587 of file cabac.h.

Referenced by decode_cabac_b_mb_sub_type(), decode_cabac_mb_intra4x4_pred_mode(), decode_cabac_mb_mvd(), decode_cabac_mb_ref(), decode_cabac_p_mb_sub_type(), and decode_cabac_residual_internal().

static int av_unused get_cabac_bypass

(

CABACContext *

c

)

[static]

Definition at line 591 of file cabac.h.

Referenced by decode_cabac_mb_mvd(), and decode_cabac_residual_internal().

static av_always_inline int get_cabac_bypass_sign	(	CABACContext *	c,
		int	val
	)			[static]

Definition at line 639 of file cabac.h.

Referenced by decode_cabac_mb_mvd(), and decode_cabac_residual_internal().

static av_always_inline int get_cabac_inline	(	CABACContext *	c,
		uint8_t *const	state
	)			[static]

Definition at line 371 of file cabac.h.

Referenced by get_cabac(), and get_cabac_noinline().

static int av_noinline av_unused get_cabac_noinline	(	CABACContext *	c,
		uint8_t *const	state
	)			[static]

Definition at line 583 of file cabac.h.

Referenced by decode_cabac_field_decoding_flag(), decode_cabac_intra_mb_type(), decode_cabac_mb_cbp_chroma(), decode_cabac_mb_cbp_luma(), decode_cabac_mb_chroma_pre_mode(), decode_cabac_mb_dqp(), decode_cabac_mb_skip(), decode_cabac_mb_transform_size(), decode_cabac_mb_type_b(), and decode_mb_cabac().

static int av_unused get_cabac_terminate

(

CABACContext *

c

)

[static]

Returns:

the number of bytes read or 0 if no end

Definition at line 690 of file cabac.h.

Referenced by decode_cabac_intra_mb_type(), and decode_slice().

static void put_cabac_bit	(	CABACContext *	c,
		int	b
	)			[inline, static]

Definition at line 66 of file cabac.h.

Referenced by renorm_cabac_encoder().

static void refill

(

CABACContext *

c

)

[static]

Definition at line 263 of file cabac.h.

Referenced by get_cabac_bypass(), get_cabac_bypass_sign(), get_rac(), renorm_cabac_decoder(), and renorm_cabac_decoder_once().

static void refill2

(

CABACContext *

c

)

[static]

Definition at line 274 of file cabac.h.

Referenced by get_cabac_inline().

static void renorm_cabac_decoder

(

CABACContext *

c

)

[inline, static]

Definition at line 293 of file cabac.h.

static void renorm_cabac_decoder_once

(

CABACContext *

c

)

[inline, static]

Definition at line 302 of file cabac.h.

Referenced by get_cabac_inline(), and get_cabac_terminate().

static void renorm_cabac_encoder

(

CABACContext *

c

)

[inline, static]

Definition at line 73 of file cabac.h.

---

Variable Documentation

uint8_t ff_h264_lps_range[4 *2 *64]

rangeTabLPS

Definition at line 53 of file cabac.c.

Referenced by ff_init_cabac_states(), and get_cabac_inline().

uint8_t ff_h264_lps_state[2 *64]

transIdxLPS

Definition at line 54 of file cabac.c.

Referenced by ff_init_cabac_states(), and get_cabac_inline().

uint8_t ff_h264_mlps_state[4 *64]

Definition at line 52 of file cabac.c.

Referenced by ff_init_cabac_states(), and get_cabac_inline().

uint8_t ff_h264_mps_state[2 *64]

transIdxMPS

Definition at line 55 of file cabac.c.

Referenced by ff_init_cabac_states(), and get_cabac_inline().

const uint8_t ff_h264_norm_shift[512]

Definition at line 90 of file cabac.c.

Referenced by get_cabac_inline(), and refill2().