Generate Pink Noise using Gardner method, and make "waves". Provides an example of how to post stuff to/from the audio callback using lock-free FIFOs implemented by the PA ringbuffer. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include "portaudio.h"
#include "pa_ringbuffer.h"
#include "pa_util.h"

Data Structures
struct	PinkNoise

struct	BiQuad

struct	OceanWave

struct	paTestData

Macros
#define	PINK_MAX_RANDOM_ROWS (30)

#define	PINK_RANDOM_BITS (24)

#define	PINK_RANDOM_SHIFT ((sizeof(long)*8)-PINK_RANDOM_BITS)

#define	NEW_ROW_SIZE (12 + (8*rand())/RAND_MAX)

Enumerations
enum	EnvState { State_kAttack, State_kPreDecay, State_kDecay, State_kCnt }

Functions
void	InitializePinkNoise (PinkNoise *pink, int numRows)

float	GeneratePinkNoise (PinkNoise *pink)

unsigned	GenerateWave (OceanWave wave, float output, unsigned noOfFrames)

float	ProcessBiquad (const BiQuad coeffs, float memory, float input)

OceanWave *	InitializeWave (double SR, float attackInSeconds, float maxLevel, float positionLeftRight)

int	main (void)

Detailed Description

Generate Pink Noise using Gardner method, and make "waves". Provides an example of how to post stuff to/from the audio callback using lock-free FIFOs implemented by the PA ringbuffer.

Optimization suggested by James McCartney uses a tree
to select which random value to replace.

    x x x x x x x x x x x x x x x x
    x   x   x   x   x   x   x   x
    x       x       x       x
     x               x
       x

Tree is generated by counting trailing zeros in an increasing index. When the index is zero, no random number is selected.

Author: Phil Burk http://www.softsynth.com Robert Bielik

Definition in file paex_ocean_shore.c.

Data Structures

Macros

Enumerations

Functions

Detailed Description