/* ========================================
* Distance - Distance.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __Distance_H
#include "Distance.h"
#endif
void Distance::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();
double softslew = (pow(A*2.0,3.0)*12.0)+0.6;
softslew *= overallscale;
double filtercorrect = softslew / 2.0;
double thirdfilter = softslew / 3.0;
double levelcorrect = 1.0 + (softslew / 6.0);
double postfilter;
double wet = B;
double dry = 1.0-wet;
double bridgerectifier;
long double inputSampleL;
long double inputSampleR;
long double drySampleL;
long double drySampleR;
while (--sampleFrames >= 0)
{
inputSampleL = *in1;
inputSampleR = *in2;
if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
static int noisesource = 0;
//this declares a variable before anything else is compiled. It won't keep assigning
//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
//but it lets me add this denormalization fix in a single place rather than updating
//it in three different locations. The variable isn't thread-safe but this is only
//a random seed and we can share it with whatever.
noisesource = noisesource % 1700021; noisesource++;
int residue = noisesource * noisesource;
residue = residue % 170003; residue *= residue;
residue = residue % 17011; residue *= residue;
residue = residue % 1709; residue *= residue;
residue = residue % 173; residue *= residue;
residue = residue % 17;
double applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSampleL = applyresidue;
}
if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
static int noisesource = 0;
noisesource = noisesource % 1700021; noisesource++;
int residue = noisesource * noisesource;
residue = residue % 170003; residue *= residue;
residue = residue % 17011; residue *= residue;
residue = residue % 1709; residue *= residue;
residue = residue % 173; residue *= residue;
residue = residue % 17;
double applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSampleR = applyresidue;
//this denormalization routine produces a white noise at -300 dB which the noise
//shaping will interact with to produce a bipolar output, but the noise is actually
//all positive. That should stop any variables from going denormal, and the routine
//only kicks in if digital black is input. As a final touch, if you save to 24-bit
//the silence will return to being digital black again.
}
drySampleL = inputSampleL;
drySampleR = inputSampleR;
inputSampleL *= softslew;
lastclampL = clampL;
clampL = inputSampleL - lastL;
postfilter = changeL = fabs(clampL - lastclampL);
postfilter += filtercorrect;
if (changeL > 1.5707963267949) changeL = 1.5707963267949;
bridgerectifier = (1.0-sin(changeL));
if (bridgerectifier < 0.0) bridgerectifier = 0.0;
inputSampleL = lastL + (clampL * bridgerectifier);
lastL = inputSampleL;
inputSampleL /= softslew;
inputSampleL += (thirdresultL * thirdfilter);
inputSampleL /= (thirdfilter + 1.0);
inputSampleL += (prevresultL * postfilter);
inputSampleL /= (postfilter + 1.0);
//do an IIR like thing to further squish superdistant stuff
thirdresultL = prevresultL;
prevresultL = inputSampleL;
inputSampleL *= levelcorrect;
inputSampleR *= softslew;
lastclampR = clampR;
clampR = inputSampleR - lastR;
postfilter = changeR = fabs(clampR - lastclampR);
postfilter += filtercorrect;
if (changeR > 1.5707963267949) changeR = 1.5707963267949;
bridgerectifier = (1.0-sin(changeR));
if (bridgerectifier < 0.0) bridgerectifier = 0.0;
inputSampleR = lastR + (clampR * bridgerectifier);
lastR = inputSampleR;
inputSampleR /= softslew;
inputSampleR += (thirdresultR * thirdfilter);
inputSampleR /= (thirdfilter + 1.0);
inputSampleR += (prevresultR * postfilter);
inputSampleR /= (postfilter + 1.0);
//do an IIR like thing to further squish superdistant stuff
thirdresultR = prevresultR;
prevresultR = inputSampleR;
inputSampleR *= levelcorrect;
if (wet < 1.0) {
inputSampleL = (drySampleL * dry)+(inputSampleL*wet);
inputSampleR = (drySampleR * dry)+(inputSampleR*wet);
}
//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);
inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
frexpf((float)inputSampleR, &expon);
dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
//end 32 bit dither
*out1 = inputSampleL;
*out2 = inputSampleR;
*in1++;
*in2++;
*out1++;
*out2++;
}
}
void Distance::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();
double softslew = (pow(A*2.0,3.0)*12.0)+0.6;
softslew *= overallscale;
double filtercorrect = softslew / 2.0;
double thirdfilter = softslew / 3.0;
double levelcorrect = 1.0 + (softslew / 6.0);
double postfilter;
double wet = B;
double dry = 1.0-wet;
double bridgerectifier;
long double inputSampleL;
long double inputSampleR;
long double drySampleL;
long double drySampleR;
while (--sampleFrames >= 0)
{
inputSampleL = *in1;
inputSampleR = *in2;
if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
static int noisesource = 0;
//this declares a variable before anything else is compiled. It won't keep assigning
//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
//but it lets me add this denormalization fix in a single place rather than updating
//it in three different locations. The variable isn't thread-safe but this is only
//a random seed and we can share it with whatever.
noisesource = noisesource % 1700021; noisesource++;
int residue = noisesource * noisesource;
residue = residue % 170003; residue *= residue;
residue = residue % 17011; residue *= residue;
residue = residue % 1709; residue *= residue;
residue = residue % 173; residue *= residue;
residue = residue % 17;
double applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSampleL = applyresidue;
}
if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
static int noisesource = 0;
noisesource = noisesource % 1700021; noisesource++;
int residue = noisesource * noisesource;
residue = residue % 170003; residue *= residue;
residue = residue % 17011; residue *= residue;
residue = residue % 1709; residue *= residue;
residue = residue % 173; residue *= residue;
residue = residue % 17;
double applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSampleR = applyresidue;
//this denormalization routine produces a white noise at -300 dB which the noise
//shaping will interact with to produce a bipolar output, but the noise is actually
//all positive. That should stop any variables from going denormal, and the routine
//only kicks in if digital black is input. As a final touch, if you save to 24-bit
//the silence will return to being digital black again.
}
drySampleL = inputSampleL;
drySampleR = inputSampleR;
inputSampleL *= softslew;
lastclampL = clampL;
clampL = inputSampleL - lastL;
postfilter = changeL = fabs(clampL - lastclampL);
postfilter += filtercorrect;
if (changeL > 1.5707963267949) changeL = 1.5707963267949;
bridgerectifier = (1.0-sin(changeL));
if (bridgerectifier < 0.0) bridgerectifier = 0.0;
inputSampleL = lastL + (clampL * bridgerectifier);
lastL = inputSampleL;
inputSampleL /= softslew;
inputSampleL += (thirdresultL * thirdfilter);
inputSampleL /= (thirdfilter + 1.0);
inputSampleL += (prevresultL * postfilter);
inputSampleL /= (postfilter + 1.0);
//do an IIR like thing to further squish superdistant stuff
thirdresultL = prevresultL;
prevresultL = inputSampleL;
inputSampleL *= levelcorrect;
inputSampleR *= softslew;
lastclampR = clampR;
clampR = inputSampleR - lastR;
postfilter = changeR = fabs(clampR - lastclampR);
postfilter += filtercorrect;
if (changeR > 1.5707963267949) changeR = 1.5707963267949;
bridgerectifier = (1.0-sin(changeR));
if (bridgerectifier < 0.0) bridgerectifier = 0.0;
inputSampleR = lastR + (clampR * bridgerectifier);
lastR = inputSampleR;
inputSampleR /= softslew;
inputSampleR += (thirdresultR * thirdfilter);
inputSampleR /= (thirdfilter + 1.0);
inputSampleR += (prevresultR * postfilter);
inputSampleR /= (postfilter + 1.0);
//do an IIR like thing to further squish superdistant stuff
thirdresultR = prevresultR;
prevresultR = inputSampleR;
inputSampleR *= levelcorrect;
if (wet < 1.0) {
inputSampleL = (drySampleL * dry)+(inputSampleL*wet);
inputSampleR = (drySampleR * dry)+(inputSampleR*wet);
}
//stereo 64 bit dither, made small and tidy.
int expon; frexp((double)inputSampleL, &expon);
long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
dither /= 536870912.0; //needs this to scale to 64 bit zone
inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
frexp((double)inputSampleR, &expon);
dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
dither /= 536870912.0; //needs this to scale to 64 bit zone
inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
//end 64 bit dither
*out1 = inputSampleL;
*out2 = inputSampleR;
*in1++;
*in2++;
*out1++;
*out2++;
}
}
