context.h File Reference

Context derivation for CABAC. More...

#include "cabac.h"
#include "encoderstate.h"
#include "global.h"

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Macros
#define	CNU   154

Functions
void	kvz_ctx_init (cabac_ctx_t *ctx, uint32_t qp, uint32_t init_value)
	Initialize struct cabac_ctx.
void	kvz_init_contexts (encoder_state_t *state, int8_t QP, int8_t slice)
	Initialize cabac context to be used for coding.
void	kvz_context_copy (encoder_state_t *target_state, const encoder_state_t *source_state)
int32_t	kvz_context_calc_pattern_sig_ctx (const uint32_t *sig_coeff_group_flag, uint32_t pos_x, uint32_t pos_y, int32_t width)
	Pattern decision for context derivation process of significant_coeff_flag.
uint32_t	kvz_context_get_sig_coeff_group (uint32_t *sig_coeff_group_flag, uint32_t pos_x, uint32_t pos_y, int32_t width)
int32_t	kvz_context_get_sig_ctx_inc (int32_t pattern_sig_ctx, uint32_t scan_idx, int32_t pos_x, int32_t pos_y, int32_t block_type, int8_t texture_type)
	Context derivation process of coeff_abs_significant_flag.

Macro Definition Documentation

CNU

#define CNU   154

Function Documentation

kvz_context_calc_pattern_sig_ctx()

int32_t kvz_context_calc_pattern_sig_ctx	(	const uint32_t *	sig_coeff_group_flag,
		uint32_t	pos_x,
		uint32_t	pos_y,
		int32_t	width
	)

Parameters

sig_coeff_group_flag	pointer to prior coded significant coeff group
pos_x	column of current coefficient group
pos_y	row of current coefficient group
width	width of the block

Returns

pattern for current coefficient group

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kvz_context_copy()

void kvz_context_copy	(	encoder_state_t *	target_state,
		const encoder_state_t *	source_state
	)

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kvz_context_get_sig_coeff_group()

uint32_t kvz_context_get_sig_coeff_group	(	uint32_t *	sig_coeff_group_flag,
		uint32_t	pos_x,
		uint32_t	pos_y,
		int32_t	width
	)

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kvz_context_get_sig_ctx_inc()

int32_t kvz_context_get_sig_ctx_inc	(	int32_t	pattern_sig_ctx,
		uint32_t	scan_idx,
		int32_t	pos_x,
		int32_t	pos_y,
		int32_t	block_type,
		int8_t	texture_type
	)

Parameters

pattern_sig_ctx	pattern for current coefficient group
scan_idx	pixel scan type in use
pos_x	column of current scan position
pos_y	row of current scan position
block_type	log2 value of block size if square block, or 4 otherwise
width	width of the block
texture_type	texture type (TEXT_LUMA...)

Returns

ctx_inc for current scan position

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kvz_ctx_init()

void kvz_ctx_init	(	cabac_ctx_t *	ctx,
		uint32_t	qp,
		uint32_t	init_value
	)

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kvz_init_contexts()

void kvz_init_contexts	(	encoder_state_t *	state,
		int8_t	QP,
		int8_t	slice
	)

Parameters

encoder	encoder control struct
slice	type of slice we are coding (P/B/I)

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