transform.c File Reference

#include "transform.h"
#include "image.h"
#include "kvazaar.h"
#include "rdo.h"
#include "strategies/strategies-dct.h"
#include "strategies/strategies-quant.h"
#include "strategies/strategies-picture.h"
#include "tables.h"

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Typedefs
typedef enum rdpcm_dir	rdpcm_dir
	RDPCM direction.

Enumerations
enum	rdpcm_dir { RDPCM_VER = 0 , RDPCM_HOR = 1 }
	RDPCM direction. More...

Functions
static bool	bypass_transquant (const int width, const int in_stride, const int out_stride, const kvz_pixel *const ref_in, const kvz_pixel *const pred_in, kvz_pixel *rec_out, coeff_t *coeff_out)
	Bypass transform and quantization.
static void	rdpcm (const int width, const rdpcm_dir dir, coeff_t *coeff)
	Apply DPCM to residual.
int32_t	kvz_get_scaled_qp (int8_t type, int8_t qp, int8_t qp_offset)
	Get scaled QP used in quantization.
void	kvz_transformskip (const encoder_control_t *const encoder, int16_t *block, int16_t *coeff, int8_t block_size)
	NxN inverse transform (2D)
void	kvz_itransformskip (const encoder_control_t *const encoder, int16_t *block, int16_t *coeff, int8_t block_size)
	inverse transform skip
void	kvz_transform2d (const encoder_control_t *const encoder, int16_t *block, int16_t *coeff, int8_t block_size, color_t color, cu_type_t type)
	forward transform (2D)
void	kvz_itransform2d (const encoder_control_t *const encoder, int16_t *block, int16_t *coeff, int8_t block_size, color_t color, cu_type_t type)
int	kvz_quantize_residual_trskip (encoder_state_t *const state, const cu_info_t *const cur_cu, const int width, const color_t color, const coeff_scan_order_t scan_order, int8_t *trskip_out, const int in_stride, const int out_stride, const kvz_pixel *const ref_in, const kvz_pixel *const pred_in, kvz_pixel *rec_out, coeff_t *coeff_out)
	Like kvz_quantize_residual except that this uses trskip if that is better.
static void	quantize_tr_residual (encoder_state_t *const state, const color_t color, const int32_t x, const int32_t y, const uint8_t depth, cu_info_t *cur_pu, lcu_t *lcu, bool early_skip)
	Calculate the residual coefficients for a single TU.
void	kvz_quantize_lcu_residual (encoder_state_t *const state, const bool luma, const bool chroma, const int32_t x, const int32_t y, const uint8_t depth, cu_info_t *cur_pu, lcu_t *lcu, bool early_skip)
	This function calculates the residual coefficients for a region of the LCU (defined by x, y and depth) and updates the reconstruction with the kvantized residual.

Variables
const uint8_t	kvz_g_chroma_scale [58]

Typedef Documentation

rdpcm_dir

typedef enum rdpcm_dir rdpcm_dir

Enumeration Type Documentation

rdpcm_dir

enum rdpcm_dir

Enumerator
RDPCM_VER
RDPCM_HOR

Function Documentation

bypass_transquant()

static bool bypass_transquant ( const int  width, const int  in_stride, const int  out_stride, const kvz_pixel *const  ref_in, const kvz_pixel *const  pred_in, kvz_pixel *  rec_out, coeff_t *  coeff_out  )

static

Copies the reference pixels directly to reconstruction and the residual directly to coefficients. Used when cu_transquant_bypass_flag is set. Parameters pred_in and rec_out may be aliased.

Parameters

width	Transform width.
in_stride	Stride for ref_in and pred_in
out_stride	Stride for rec_out.
ref_in	Reference pixels.
pred_in	Predicted pixels.
rec_out	Returns the reconstructed pixels.
coeff_out	Returns the coefficients used for reconstruction of rec_out.

Returns

Whether coeff_out contains any non-zero coefficients.

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kvz_get_scaled_qp()

int32_t kvz_get_scaled_qp	(	int8_t	type,
		int8_t	qp,
		int8_t	qp_offset
	)

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kvz_itransform2d()

void kvz_itransform2d	(	const encoder_control_t *const	encoder,
		int16_t *	block,
		int16_t *	coeff,
		int8_t	block_size,
		color_t	color,
		cu_type_t	type
	)

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kvz_itransformskip()

void kvz_itransformskip	(	const encoder_control_t *const	encoder,
		int16_t *	block,
		int16_t *	coeff,
		int8_t	block_size
	)

Parameters

coeff	input data (transform coefficients)
block	output data (residual)
block_size	width of transform

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kvz_quantize_lcu_residual()

void kvz_quantize_lcu_residual	(	encoder_state_t *const	state,
		const bool	luma,
		const bool	chroma,
		const int32_t	x,
		const int32_t	y,
		const uint8_t	depth,
		cu_info_t *	cur_pu,
		lcu_t *	lcu,
		bool	early_skip
	)

Processes the TU tree recursively.

Inputs are:

• lcu->rec pixels after prediction for the area
• lcu->ref reference pixels for the area
• lcu->cu for the area
• early_skip if this is used for early skip, bypass IT and IQ

Outputs are:

• lcu->rec reconstruction after quantized residual
• lcu->coeff quantized coefficients for the area
• lcu->cbf coded block flags for the area
• lcu->cu.intra.tr_skip tr skip flags for the area (in case of luma)

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kvz_quantize_residual_trskip()

int kvz_quantize_residual_trskip	(	encoder_state_t *const	state,
		const cu_info_t *const	cur_cu,
		const int	width,
		const color_t	color,
		const coeff_scan_order_t	scan_order,
		int8_t *	trskip_out,
		const int	in_stride,
		const int	out_stride,
		const kvz_pixel *const	ref_in,
		const kvz_pixel *const	pred_in,
		kvz_pixel *	rec_out,
		coeff_t *	coeff_out
	)

Using this function saves one step of quantization and inverse quantization compared to doing the decision separately from the actual operation.

Parameters

width	Transform width.
color	Color.
scan_order	Coefficient scan order.
trskip_out	Whether transform skip is used.
stride	Stride for ref_in, pred_in and rec_out.
ref_in	Reference pixels.
pred_in	Predicted pixels.
rec_out	Reconstructed pixels.
coeff_out	Coefficients used for reconstruction of rec_out.

Returns

Whether coeff_out contains any non-zero coefficients.

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kvz_transform2d()

void kvz_transform2d	(	const encoder_control_t *const	encoder,
		int16_t *	block,
		int16_t *	coeff,
		int8_t	block_size,
		color_t	color,
		cu_type_t	type
	)

Parameters

block	input residual
coeff	transform coefficients
block_size	width of transform

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kvz_transformskip()

void kvz_transformskip	(	const encoder_control_t *const	encoder,
		int16_t *	block,
		int16_t *	coeff,
		int8_t	block_size
	)

Parameters

coeff	input data (transform coefficients)
block	output data (residual)
block_size	input data (width of transform)

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quantize_tr_residual()

static void quantize_tr_residual ( encoder_state_t *const  state, const color_t  color, const int32_t  x, const int32_t  y, const uint8_t  depth, cu_info_t *  cur_pu, lcu_t *  lcu, bool  early_skip  )

static

Parameters

early_skip

if this is used for early skip, bypass IT and IQ

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rdpcm()

static void rdpcm ( const int  width, const rdpcm_dir  dir, coeff_t *  coeff  )

static

Parameters

width	width of the block
dir	RDPCM direction
coeff	coefficients (residual) to filter

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Variable Documentation

kvz_g_chroma_scale

const uint8_t kvz_g_chroma_scale[58]

Initial value:

=
{
   0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,
  17,18,19,20,21,22,23,24,25,26,27,28,29,29,30,31,32,
  33,33,34,34,35,35,36,36,37,37,38,39,40,41,42,43,44,
  45,46,47,48,49,50,51
}