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/* ========================================
* Channel4 - Channel4.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __Channel4_H
#include "Channel4.h"
#endif
void Channel4::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();
float fpTemp;
double fpOld = 0.618033988749894848204586; //golden ratio!
double fpNew = 1.0 - fpOld;
const double localiirAmount = iirAmount / overallscale;
const double localthreshold = threshold / overallscale;
const double density = pow(drive,2); //this doesn't relate to the plugins Density and Drive much
double clamp;
long double bridgerectifier;
long double inputSampleL;
long double inputSampleR;
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.
}
if (fpFlip)
{
iirSampleLA = (iirSampleLA * (1 - localiirAmount)) + (inputSampleL * localiirAmount);
inputSampleL = inputSampleL - iirSampleLA;
iirSampleRA = (iirSampleRA * (1 - localiirAmount)) + (inputSampleR * localiirAmount);
inputSampleR = inputSampleR - iirSampleRA;
}
else
{
iirSampleLB = (iirSampleLB * (1 - localiirAmount)) + (inputSampleL * localiirAmount);
inputSampleL = inputSampleL - iirSampleLB;
iirSampleRB = (iirSampleRB * (1 - localiirAmount)) + (inputSampleR * localiirAmount);
inputSampleR = inputSampleR - iirSampleRB;
}
//highpass section
bridgerectifier = fabs(inputSampleL)*1.57079633;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
else bridgerectifier = sin(bridgerectifier);
if (inputSampleL > 0) inputSampleL = (inputSampleL*(1-density))+(bridgerectifier*density);
else inputSampleL = (inputSampleL*(1-density))-(bridgerectifier*density);
bridgerectifier = fabs(inputSampleR)*1.57079633;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
else bridgerectifier = sin(bridgerectifier);
if (inputSampleR > 0) inputSampleR = (inputSampleR*(1-density))+(bridgerectifier*density);
else inputSampleR = (inputSampleR*(1-density))-(bridgerectifier*density);
//drive section
clamp = inputSampleL - lastSampleL;
if (clamp > localthreshold)
inputSampleL = lastSampleL + localthreshold;
if (-clamp > localthreshold)
inputSampleL = lastSampleL - localthreshold;
lastSampleL = inputSampleL;
clamp = inputSampleR - lastSampleR;
if (clamp > localthreshold)
inputSampleR = lastSampleR + localthreshold;
if (-clamp > localthreshold)
inputSampleR = lastSampleR - localthreshold;
lastSampleR = inputSampleR;
//slew section
//noise shaping to 32-bit floating point
if (fpFlip) {
fpTemp = inputSampleL;
fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
inputSampleL += fpNShapeLA;
fpTemp = inputSampleR;
fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
inputSampleR += fpNShapeRA;
}
else {
fpTemp = inputSampleL;
fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
inputSampleL += fpNShapeLB;
fpTemp = inputSampleR;
fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
inputSampleR += fpNShapeRB;
}
fpFlip = !fpFlip;
//end noise shaping on 32 bit output
*out1 = inputSampleL;
*out2 = inputSampleR;
*in1++;
*in2++;
*out1++;
*out2++;
}
}
void Channel4::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 fpTemp; //this is different from singlereplacing
double fpOld = 0.618033988749894848204586; //golden ratio!
double fpNew = 1.0 - fpOld;
const double localiirAmount = iirAmount / overallscale;
const double localthreshold = threshold / overallscale;
const double density = pow(drive,2); //this doesn't relate to the plugins Density and Drive much
double clamp;
long double bridgerectifier;
long double inputSampleL;
long double inputSampleR;
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.
}
if (fpFlip)
{
iirSampleLA = (iirSampleLA * (1 - localiirAmount)) + (inputSampleL * localiirAmount);
inputSampleL = inputSampleL - iirSampleLA;
iirSampleRA = (iirSampleRA * (1 - localiirAmount)) + (inputSampleR * localiirAmount);
inputSampleR = inputSampleR - iirSampleRA;
}
else
{
iirSampleLB = (iirSampleLB * (1 - localiirAmount)) + (inputSampleL * localiirAmount);
inputSampleL = inputSampleL - iirSampleLB;
iirSampleRB = (iirSampleRB * (1 - localiirAmount)) + (inputSampleR * localiirAmount);
inputSampleR = inputSampleR - iirSampleRB;
}
//highpass section
bridgerectifier = fabs(inputSampleL)*1.57079633;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
else bridgerectifier = sin(bridgerectifier);
if (inputSampleL > 0) inputSampleL = (inputSampleL*(1-density))+(bridgerectifier*density);
else inputSampleL = (inputSampleL*(1-density))-(bridgerectifier*density);
bridgerectifier = fabs(inputSampleR)*1.57079633;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
else bridgerectifier = sin(bridgerectifier);
if (inputSampleR > 0) inputSampleR = (inputSampleR*(1-density))+(bridgerectifier*density);
else inputSampleR = (inputSampleR*(1-density))-(bridgerectifier*density);
//drive section
clamp = inputSampleL - lastSampleL;
if (clamp > localthreshold)
inputSampleL = lastSampleL + localthreshold;
if (-clamp > localthreshold)
inputSampleL = lastSampleL - localthreshold;
lastSampleL = inputSampleL;
clamp = inputSampleR - lastSampleR;
if (clamp > localthreshold)
inputSampleR = lastSampleR + localthreshold;
if (-clamp > localthreshold)
inputSampleR = lastSampleR - localthreshold;
lastSampleR = inputSampleR;
//slew section
//noise shaping to 64-bit floating point
if (fpFlip) {
fpTemp = inputSampleL;
fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
inputSampleL += fpNShapeLA;
fpTemp = inputSampleR;
fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
inputSampleR += fpNShapeRA;
}
else {
fpTemp = inputSampleL;
fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
inputSampleL += fpNShapeLB;
fpTemp = inputSampleR;
fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
inputSampleR += fpNShapeRB;
}
fpFlip = !fpFlip;
//end noise shaping on 64 bit output
*out1 = inputSampleL;
*out2 = inputSampleR;
*in1++;
*in2++;
*out1++;
*out2++;
}
}
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