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/* ========================================
* DitherFloat - DitherFloat.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __DitherFloat_H
#include "DitherFloat.h"
#endif
void DitherFloat::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames)
{
float* in1 = inputs[0];
float* in2 = inputs[1];
float* out1 = outputs[0];
float* out2 = outputs[1];
double overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= getSampleRate();
int floatOffset = (A * 32);
long double blend = B;
long double gain = 0;
switch (floatOffset)
{
case 0: gain = 1.0; break;
case 1: gain = 2.0; break;
case 2: gain = 4.0; break;
case 3: gain = 8.0; break;
case 4: gain = 16.0; break;
case 5: gain = 32.0; break;
case 6: gain = 64.0; break;
case 7: gain = 128.0; break;
case 8: gain = 256.0; break;
case 9: gain = 512.0; break;
case 10: gain = 1024.0; break;
case 11: gain = 2048.0; break;
case 12: gain = 4096.0; break;
case 13: gain = 8192.0; break;
case 14: gain = 16384.0; break;
case 15: gain = 32768.0; break;
case 16: gain = 65536.0; break;
case 17: gain = 131072.0; break;
case 18: gain = 262144.0; break;
case 19: gain = 524288.0; break;
case 20: gain = 1048576.0; break;
case 21: gain = 2097152.0; break;
case 22: gain = 4194304.0; break;
case 23: gain = 8388608.0; break;
case 24: gain = 16777216.0; break;
case 25: gain = 33554432.0; break;
case 26: gain = 67108864.0; break;
case 27: gain = 134217728.0; break;
case 28: gain = 268435456.0; break;
case 29: gain = 536870912.0; break;
case 30: gain = 1073741824.0; break;
case 31: gain = 2147483648.0; break;
case 32: gain = 4294967296.0; break;
}
//we are directly punching in the gain values rather than calculating them
while (--sampleFrames >= 0)
{
long double inputSampleL = *in1 + (gain-1);
long double inputSampleR = *in2 + (gain-1);
//stereo 32 bit dither, made small and tidy.
int expon; frexpf((float)inputSampleL, &expon);
long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62) * blend; //remove 'blend' for real use, it's for the demo;
inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
frexpf((float)inputSampleR, &expon);
dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62) * blend; //remove 'blend' for real use, it's for the demo;
inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
//end 32 bit dither
inputSampleL = (float)inputSampleL; //equivalent of 'floor' for 32 bit floating point
inputSampleR = (float)inputSampleR; //equivalent of 'floor' for 32 bit floating point
//We do that separately, we're truncating to floating point WHILE heavily offset.
*out1 = inputSampleL - (gain-1);
*out2 = inputSampleR - (gain-1);
*in1++;
*in2++;
*out1++;
*out2++;
}
}
void DitherFloat::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames)
{
double* in1 = inputs[0];
double* in2 = inputs[1];
double* out1 = outputs[0];
double* out2 = outputs[1];
double overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= getSampleRate();
int floatOffset = (A * 32);
long double blend = B;
long double gain = 0;
switch (floatOffset)
{
case 0: gain = 1.0; break;
case 1: gain = 2.0; break;
case 2: gain = 4.0; break;
case 3: gain = 8.0; break;
case 4: gain = 16.0; break;
case 5: gain = 32.0; break;
case 6: gain = 64.0; break;
case 7: gain = 128.0; break;
case 8: gain = 256.0; break;
case 9: gain = 512.0; break;
case 10: gain = 1024.0; break;
case 11: gain = 2048.0; break;
case 12: gain = 4096.0; break;
case 13: gain = 8192.0; break;
case 14: gain = 16384.0; break;
case 15: gain = 32768.0; break;
case 16: gain = 65536.0; break;
case 17: gain = 131072.0; break;
case 18: gain = 262144.0; break;
case 19: gain = 524288.0; break;
case 20: gain = 1048576.0; break;
case 21: gain = 2097152.0; break;
case 22: gain = 4194304.0; break;
case 23: gain = 8388608.0; break;
case 24: gain = 16777216.0; break;
case 25: gain = 33554432.0; break;
case 26: gain = 67108864.0; break;
case 27: gain = 134217728.0; break;
case 28: gain = 268435456.0; break;
case 29: gain = 536870912.0; break;
case 30: gain = 1073741824.0; break;
case 31: gain = 2147483648.0; break;
case 32: gain = 4294967296.0; break;
}
//we are directly punching in the gain values rather than calculating them
while (--sampleFrames >= 0)
{
long double inputSampleL = *in1 + (gain-1);
long double inputSampleR = *in2 + (gain-1);
//stereo 32 bit dither, made small and tidy.
int expon; frexpf((float)inputSampleL, &expon);
long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62) * blend; //remove 'blend' for real use, it's for the demo;
inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
frexpf((float)inputSampleR, &expon);
dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62) * blend; //remove 'blend' for real use, it's for the demo;
inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
//end 32 bit dither
inputSampleL = (float)inputSampleL; //equivalent of 'floor' for 32 bit floating point
inputSampleR = (float)inputSampleR; //equivalent of 'floor' for 32 bit floating point
//We do that separately, we're truncating to floating point WHILE heavily offset.
//note for 64 bit version: this is not for actually dithering 64 bit floats!
//This is specifically for demonstrating the sound of 32 bit floating point dither
//even over a 64 bit buss. Therefore it should be using float, above!
*out1 = inputSampleL - (gain-1);
*out2 = inputSampleR - (gain-1);
*in1++;
*in2++;
*out1++;
*out2++;
}
}
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