paqa_dither.c File Reference

Tests the dither scaling and conversion accuracy in pa_converters.c. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "portaudio.h"
#include "pa_converters.h"
#include "pa_dither.h"
#include "pa_types.h"
#include "pa_endianness.h"
#include "paqa_macros.h"

Macros
#define	PAQA_SHOW_CHARTS   0
#define	NUM_BINS   32
#define	NUM_SAMPLES   1024
#define	LINEARITY_NUM_STEPS   41

Functions
int	ShowDitherDistribution (void)
double	CalculateRSquared (double *xa, double *ya, int numPoints)
void	linearRegression (double *xa, double *ya, int numPoints, double *a, double *b)
int	TestAllDitherScaling (void)
int	TestAllDitherClipping (void)
int	main (int argc, const char **argv)

Detailed Description

Tests the dither scaling and conversion accuracy in pa_converters.c.

Author

Phil Burk philb.nosp@m.urk@.nosp@m.mobil.nosp@m.eer..nosp@m.com

Link with pa_dither.c and pa_converters.c

Macro Definition Documentation

#define LINEARITY_NUM_STEPS   41

#define NUM_BINS   32

Referenced by ShowDitherDistribution().

#define NUM_SAMPLES   1024

#define PAQA_SHOW_CHARTS   0

Function Documentation

double CalculateRSquared	(	double *	xa,
		double *	ya,
		int	numPoints
	)

Calculate the Coefficient of Determination, "R-squared". You want a value as close to 1.0 as possible.

void linearRegression	(	double *	xa,
		double *	ya,
		int	numPoints,
		double *	a,
		double *	b
	)

int main	(	int	argc,
		const char **	argv
	)

References PAQA_EXIT_RESULT, PAQA_PRINT_RESULT, ShowDitherDistribution(), TestAllDitherClipping(), and TestAllDitherScaling().

int ShowDitherDistribution

(

void

)

Show a histogram of the dither values.

References NUM_BINS, PaUtil_Generate16BitTriangularDither(), and PaUtil_InitializeTriangularDitherState().

Referenced by main().

int TestAllDitherClipping

(

void

)

References paFloat32, paInt16, paInt32, paInt8, and paUInt8.

Referenced by main().

int TestAllDitherScaling

(

void

)

References paFloat32, paInt16, paInt32, and paInt8.

Referenced by main().