quant.h File Reference

definitions for quantization functions More...

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Defines
#define	Q_BITS   15
#define	DQ_BITS   6
#define	Q_BITS_8   16
#define	DQ_BITS_8   6
Functions
void	init_qp_process (ImageParameters *p_Img)
void	free_qp_matrices (ImageParameters *p_Img)
void	assign_quant_params (Slice *currslice, pic_parameter_set_rbsp_t *pps, seq_parameter_set_rbsp_t *sps)
void	CalculateQuant4x4Param (Slice *currslice)
void	CalculateQuant8x8Param (Slice *currslice)
Variables
static const int	dequant_coef8 [6][8][8]
static const int	dequant_coef [6][4][4]
static const int	quant_coef [6][4][4]
static const int	A [4][4]

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Detailed Description

definitions for quantization functions

Author:

Definition in file quant.h.

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Function Documentation

void assign_quant_params	(	Slice *	currSlice,
		pic_parameter_set_rbsp_t *	pps,
		seq_parameter_set_rbsp_t *	sps
	)

For mapping the q-matrix to the active id and calculate quantisation values.

Parameters:

	currSlice	Slice pointer
	pps	Picture parameter set
	sps	Sequence parameter set

Definition at line 137 of file quant.c.

References CalculateQuant4x4Param(), CalculateQuant8x8Param(), and YUV444.

Referenced by read_new_slice().

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void CalculateQuant4x4Param

(

Slice *

currslice

)

For calculating the quantisation values at frame level.

Definition at line 265 of file quant.c.

References dequant_coef.

Referenced by assign_quant_params().

void CalculateQuant8x8Param

(

Slice *

currslice

)

Calculate the quantisation and inverse quantisation parameters.

Definition at line 295 of file quant.c.

Referenced by assign_quant_params().

void init_qp_process

(

ImageParameters *

p_Img

)

Initiate quantization process arrays.

Definition at line 86 of file quant.c.

References no_mem_exit().

Referenced by init_global_buffers().

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Variable Documentation

const int A[4][4] [static]

Initial value:

 {
  { 16, 20, 16, 20},
  { 20, 25, 20, 25},
  { 16, 20, 16, 20},
  { 20, 25, 20, 25}
}

Definition at line 157 of file quant.h.

const int dequant_coef[6][4][4] [static]

Dequantization coefficients.

Definition at line 90 of file quant.h.

Referenced by CalculateQuant4x4Param(), and itrans_sp().