libavcodec/dirac_arith.h File Reference

Arithmetic decoder for Dirac. More...

#include "bytestream.h"
#include "get_bits.h"

Go to the source code of this file.

Data Structures
struct	DiracArith
Defines
#define	CTX_SB_F1   CTX_ZP_F5
#define	CTX_SB_DATA   0
#define	CTX_PMODE_REF1   0
#define	CTX_PMODE_REF2   1
#define	CTX_GLOBAL_BLOCK   2
#define	CTX_MV_F1   CTX_ZP_F2
#define	CTX_MV_DATA   0
#define	CTX_DC_F1   CTX_ZP_F5
#define	CTX_DC_DATA   0
Enumerations
enum	dirac_arith_contexts {   CTX_ZPZN_F1, CTX_ZPNN_F1, CTX_NPZN_F1, CTX_NPNN_F1,   CTX_ZP_F2, CTX_ZP_F3, CTX_ZP_F4, CTX_ZP_F5,   CTX_ZP_F6, CTX_NP_F2, CTX_NP_F3, CTX_NP_F4,   CTX_NP_F5, CTX_NP_F6, CTX_COEFF_DATA, CTX_SIGN_NEG,   CTX_SIGN_ZERO, CTX_SIGN_POS, CTX_ZERO_BLOCK, CTX_DELTA_Q_F,   CTX_DELTA_Q_DATA, CTX_DELTA_Q_SIGN, DIRAC_CTX_COUNT }
Functions
static void	renorm (DiracArith *c)
static void	refill (DiracArith *c)
static int	dirac_get_arith_bit (DiracArith *c, int ctx)
static int	dirac_get_arith_uint (DiracArith *c, int follow_ctx, int data_ctx)
static int	dirac_get_arith_int (DiracArith *c, int follow_ctx, int data_ctx)
void	ff_dirac_init_arith_decoder (DiracArith *c, GetBitContext *gb, int length)
Variables
const uint8_t	ff_dirac_next_ctx [DIRAC_CTX_COUNT]
const uint16_t	ff_dirac_prob [256]
int16_t	ff_dirac_prob_branchless [256][2]

---

Detailed Description

Arithmetic decoder for Dirac.

Author:

Marco Gerards <marco@gnu.org>

Definition in file dirac_arith.h.

---

Define Documentation

#define CTX_DC_DATA   0

Definition at line 72 of file dirac_arith.h.

Referenced by decode_block_params().

#define CTX_DC_F1   CTX_ZP_F5

Definition at line 71 of file dirac_arith.h.

Referenced by decode_block_params().

#define CTX_GLOBAL_BLOCK   2

Definition at line 68 of file dirac_arith.h.

Referenced by decode_block_params().

#define CTX_MV_DATA   0

Definition at line 70 of file dirac_arith.h.

Referenced by decode_block_params().

#define CTX_MV_F1   CTX_ZP_F2

Definition at line 69 of file dirac_arith.h.

Referenced by decode_block_params().

#define CTX_PMODE_REF1   0

Definition at line 66 of file dirac_arith.h.

Referenced by decode_block_params().

#define CTX_PMODE_REF2   1

Definition at line 67 of file dirac_arith.h.

Referenced by decode_block_params().

#define CTX_SB_DATA   0

Definition at line 65 of file dirac_arith.h.

Referenced by dirac_unpack_block_motion_data().

#define CTX_SB_F1   CTX_ZP_F5

Definition at line 64 of file dirac_arith.h.

Referenced by dirac_unpack_block_motion_data().

---

Enumeration Type Documentation

enum dirac_arith_contexts

Enumerator:

CTX_ZPZN_F1
CTX_ZPNN_F1
CTX_NPZN_F1
CTX_NPNN_F1
CTX_ZP_F2
CTX_ZP_F3
CTX_ZP_F4
CTX_ZP_F5
CTX_ZP_F6
CTX_NP_F2
CTX_NP_F3
CTX_NP_F4
CTX_NP_F5
CTX_NP_F6
CTX_COEFF_DATA
CTX_SIGN_NEG
CTX_SIGN_ZERO
CTX_SIGN_POS
CTX_ZERO_BLOCK
CTX_DELTA_Q_F
CTX_DELTA_Q_DATA
CTX_DELTA_Q_SIGN
DIRAC_CTX_COUNT

Definition at line 34 of file dirac_arith.h.

---

Function Documentation

static int dirac_get_arith_bit	(	DiracArith *	c,
		int	ctx
	)			[inline, static]

Definition at line 128 of file dirac_arith.h.

Referenced by codeblock(), coeff_unpack_arith(), decode_block_params(), dirac_get_arith_int(), and dirac_get_arith_uint().

static int dirac_get_arith_int	(	DiracArith *	c,
		int	follow_ctx,
		int	data_ctx
	)			[inline, static]

Definition at line 180 of file dirac_arith.h.

Referenced by codeblock(), and decode_block_params().

static int dirac_get_arith_uint	(	DiracArith *	c,
		int	follow_ctx,
		int	data_ctx
	)			[inline, static]

Definition at line 169 of file dirac_arith.h.

Referenced by coeff_unpack_arith(), dirac_get_arith_int(), and dirac_unpack_block_motion_data().

void ff_dirac_init_arith_decoder	(	DiracArith *	c,
		GetBitContext *	gb,
		int	length
	)

Definition at line 86 of file dirac_arith.c.

Referenced by decode_subband_internal(), and dirac_unpack_block_motion_data().

static void refill

(

DiracArith *

c

)

[inline, static]

Definition at line 106 of file dirac_arith.h.

static void renorm

(

DiracArith *

c

)

[inline, static]

Definition at line 89 of file dirac_arith.h.

Referenced by dirac_get_arith_bit().

---

Variable Documentation

const uint8_t ff_dirac_next_ctx[DIRAC_CTX_COUNT]

Definition at line 66 of file dirac_arith.c.

Referenced by dirac_get_arith_uint().

const uint16_t ff_dirac_prob[256]

Definition at line 31 of file dirac_arith.c.

Referenced by ff_dirac_init_arith_decoder().

int16_t ff_dirac_prob_branchless[256][2]

Definition at line 84 of file dirac_arith.c.

Referenced by dirac_get_arith_bit(), and ff_dirac_init_arith_decoder().