Whitenoise Refiner

readme.md

Simple WhiteNoise Refiner

• Takes data from a random source as 16-bit samples
• Applies bit masks to reduce amplitude

Exmaple Usage

./noise | aplay -N -f S16 -c2 -r 96000 -

noise.c

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>

int main( void )
{
        FILE* ifh = fopen( "/dev/urandom", "rb" );

        /* Number of samples to buffer */
        const size_t buffer_size = 256;
        /* Constant for the maximum amplitude desired */
        const int16_t max_amp  = 0x07FF;

        /* Buffer of samples to process */
        int16_t* buffer = calloc( buffer_size, sizeof( int16_t ) );

        size_t i;

        while ( 1 )
        {
                fread( buffer, sizeof( int16_t ), buffer_size, ifh );

                for ( i = 0; i < buffer_size; ++i )
                {
                        if ( buffer[i] > 0 )
                        {
                                buffer[i] = buffer[i] & max_amp;
                        }
                        else
                        {
                                buffer[i] = buffer[i] | ~max_amp;
                        }
                }

                fwrite( buffer, sizeof( int16_t ), buffer_size, stdout );
        }
}