context.c File Reference

#include "context.h"
#include "tables.h"

Include dependency graph for context.c:

Functions
void	kvz_ctx_init (cabac_ctx_t *ctx, uint32_t qp, uint32_t init_value)
	Initialize struct cabac_ctx. More...
void	kvz_init_contexts (encoder_state_t *state, int8_t QP, int8_t slice)
	Initialize cabac context to be used for coding. More...
void	kvz_context_copy (encoder_state_t *const target_state, const encoder_state_t *const source_state)
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_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. More...
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. More...

Variables
static const uint8_t	INIT_SAO_MERGE_FLAG [3] = { 153, 153, 153 }
static const uint8_t	INIT_SAO_TYPE_IDX [3] = { 160, 185, 200 }
static const uint8_t	INIT_QT_ROOT_CBF [3][1]
static const uint8_t	INIT_MVP_IDX [3][2]
static const uint8_t	INIT_REF_PIC [3][2]
static const uint8_t	INIT_MVD [3][2]
static const uint8_t	INIT_MERGE_FLAG_EXT [3][1]
static const uint8_t	INIT_MERGE_IDX_EXT [3][1]
static const uint8_t	INIT_CU_TRANSQUANT_BYPASS [3][1]
static const uint8_t	INIT_SKIP_FLAG [3][3]
static const uint8_t	INIT_PRED_MODE [3][1]
static const uint8_t	INIT_PART_SIZE [3][4]
static const uint8_t	INIT_SPLIT_FLAG [3][3]
static const uint8_t	INIT_INTRA_PRED_MODE [3]
static const uint8_t	INIT_CHROMA_PRED_MODE [3][2]
static const uint8_t	INIT_INTER_DIR [3][5]
static const uint8_t	INIT_TRANS_SUBDIV_FLAG [3][3]
static const uint8_t	INIT_QT_CBF [3][8]
static const uint8_t	INIT_CU_QP_DELTA_ABS [3][2]
static const uint8_t	INIT_SIG_CG_FLAG [3][4]
static const uint8_t	INIT_SIG_FLAG [3][42]
static const uint8_t	INIT_LAST [3][30]
static const uint8_t	INIT_ONE_FLAG [3][24]
static const uint8_t	INIT_ABS_FLAG [3][6]
static const uint8_t	INIT_TRANSFORMSKIP_FLAG [3][2]

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 *const	target_state,
		const encoder_state_t *const	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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Variable Documentation

INIT_ABS_FLAG

const uint8_t INIT_ABS_FLAG[3][6]

static

Initial value:

=
{
  { 107,167, 91,107,107,167},
  { 107,167, 91,122,107,167},
  { 138,153,136,167,152,152},
}

INIT_CHROMA_PRED_MODE

const uint8_t INIT_CHROMA_PRED_MODE[3][2]

static

Initial value:

= {
  { 152,  139 },
  { 152,  139 },
  {  63,  139 },
}

INIT_CU_QP_DELTA_ABS

const uint8_t INIT_CU_QP_DELTA_ABS[3][2]

static

Initial value:

= {
  { 154, 154 },
  { 154, 154 },
  { 154, 154 },
}

INIT_CU_TRANSQUANT_BYPASS

const uint8_t INIT_CU_TRANSQUANT_BYPASS[3][1]

static

Initial value:

= {
  { 154, },
  { 154, },
  { 154, },
}

INIT_INTER_DIR

const uint8_t INIT_INTER_DIR[3][5]

static

Initial value:

= {
  {  95,  79,  63,  31,  31, },
  {  95,  79,  63,  31,  31, },
  {  154 ,  154 ,  154 ,  154 ,  154 , },
}

INIT_INTRA_PRED_MODE

const uint8_t INIT_INTRA_PRED_MODE[3]

static

Initial value:

= {
  183, 154, 184
}

INIT_LAST

const uint8_t INIT_LAST[3][30]

static

Initial value:

= {
  { 125,  110,  124,  110,   95,   94,  125,  111,  111,   79,  125,  126,  111,  111,   79,
    108,  123,   93,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154   },
  { 125,  110,   94,  110,   95,   79,  125,  111,  110,   78,  110,  111,  111,   95,   94,
    108,  123,  108,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154   },
  { 110,  110,  124,  125,  140,  153,  125,  127,  140,  109,  111,  143,  127,  111,   79,
    108,  123,   63,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154 ,   154   },
}

INIT_MERGE_FLAG_EXT

const uint8_t INIT_MERGE_FLAG_EXT[3][1]

static

Initial value:

= {
  { 154, },
  { 110, },
  {  154 , },
}

INIT_MERGE_IDX_EXT

const uint8_t INIT_MERGE_IDX_EXT[3][1]

static

Initial value:

= {
  { 137, },
  { 122, },
  {  154 , },
}

INIT_MVD

const uint8_t INIT_MVD[3][2]

static

Initial value:

= {
  { 169,  198, },
  { 140,  198, },
  {  154 ,   154 , },
}

INIT_MVP_IDX

const uint8_t INIT_MVP_IDX[3][2]

static

Initial value:

= {
  { 168,   154 , },
  { 168,   154 , },
  {  154 ,   154 , },
}

INIT_ONE_FLAG

const uint8_t INIT_ONE_FLAG[3][24]

static

Initial value:

=
{
  {154,196,167,167,154,152,167,182,182,134,149,136,153,121,136,122,169,208,166,167,154,152,167,182},
  {154,196,196,167,154,152,167,182,182,134,149,136,153,121,136,137,169,194,166,167,154,167,137,182},
  {140, 92,137,138,140,152,138,139,153, 74,149, 92,139,107,122,152,140,179,166,182,140,227,122,197},
}

INIT_PART_SIZE

const uint8_t INIT_PART_SIZE[3][4]

static

Initial value:

= {
  { 154,  139,   154 ,   154 , },
  { 154,  139,   154 ,   154 , },
  { 184,   154 ,   154 ,   154 , },
}

INIT_PRED_MODE

const uint8_t INIT_PRED_MODE[3][1]

static

Initial value:

= {
  { 134, },
  { 149, },
  {  154 , },
}

INIT_QT_CBF

const uint8_t INIT_QT_CBF[3][8]

static

Initial value:

= {
  { 153,  111,   154 ,   154 ,   149,   92,  167,  154 },
  { 153,  111,   154 ,   154 ,   149,  107,  167,  154 },
  { 111,  141,   154 ,   154 ,    94,  138,  182,  154 },
}

INIT_QT_ROOT_CBF

const uint8_t INIT_QT_ROOT_CBF[3][1]

static

Initial value:

= {
  {  79, },
  {  79, },
  {  154 , },
}

INIT_REF_PIC

const uint8_t INIT_REF_PIC[3][2]

static

Initial value:

= {
  { 153,  153 },
  { 153,  153 },
  {  154 ,   154  },
}

INIT_SAO_MERGE_FLAG

const uint8_t INIT_SAO_MERGE_FLAG[3] = { 153, 153, 153 }

static

INIT_SAO_TYPE_IDX

const uint8_t INIT_SAO_TYPE_IDX[3] = { 160, 185, 200 }

static

INIT_SIG_CG_FLAG

const uint8_t INIT_SIG_CG_FLAG[3][4]

static

Initial value:

= {
  { 121,  140,  61,  154  },
  { 121,  140,  61,  154 },
  {  91,  171,  134,  141  },
}

INIT_SIG_FLAG

const uint8_t INIT_SIG_FLAG[3][42]

static

Initial value:

= {
   {170,154,139,153,139,123,123, 63,124,166,
    183,140,136,153,154,166,183,140,136,153,
    154,166,183,140,136,153,154,170,153,138,
    138,122,121,122,121,167,151,183,140,151,
    183,140},
   {155,154,139,153,139,123,123,63,153,166,
   183,140,136,153,154,166,183,140,136,153,
   154,166,183,140,136,153,154,170,153,123,
   123,107,121,107,121,167,151,183,140,151,
   183,140},
   {111,111,125,110,110,94,124,108,124,107,
   125,141,179,153,125,107,125,141,179,153,
   125,107,125,141,179,153,125,140,139,182,
   182,152,136,152,136,153,136,139,111,136,
   139,111},
}

INIT_SKIP_FLAG

const uint8_t INIT_SKIP_FLAG[3][3]

static

Initial value:

=  {
  { 197,  185,  201, },
  { 197,  185,  201, },
  {  154 ,   154 ,   154 , },
}

INIT_SPLIT_FLAG

const uint8_t INIT_SPLIT_FLAG[3][3]

static

Initial value:

= {
  { 107,  139,  126 },
  { 107,  139,  126 },
  { 139,  141,  157 },
}

INIT_TRANS_SUBDIV_FLAG

const uint8_t INIT_TRANS_SUBDIV_FLAG[3][3]

static

Initial value:

= {
  { 224,  167,  122 },
  { 124,  138,   94 },
  { 153,  138,  138 },
}

INIT_TRANSFORMSKIP_FLAG

const uint8_t INIT_TRANSFORMSKIP_FLAG[3][2]

static

Initial value:

=
{
  { 139,  139},
  { 139,  139},
  { 139,  139},
}