mirror of
https://github.com/airwindows/airwindows.git
synced 2026-05-21 14:56:19 -06:00
288 lines
No EOL
10 KiB
C++
Executable file
288 lines
No EOL
10 KiB
C++
Executable file
/* ========================================
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* Channel4 - Channel4.h
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* Copyright (c) 2016 airwindows, All rights reserved
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* ======================================== */
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#ifndef __Channel4_H
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#include "Channel4.h"
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#endif
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void Channel4::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames)
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{
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float* in1 = inputs[0];
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float* in2 = inputs[1];
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float* out1 = outputs[0];
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float* out2 = outputs[1];
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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= getSampleRate();
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float fpTemp;
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double fpOld = 0.618033988749894848204586; //golden ratio!
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double fpNew = 1.0 - fpOld;
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const double localiirAmount = iirAmount / overallscale;
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const double localthreshold = threshold / overallscale;
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const double density = pow(drive,2); //this doesn't relate to the plugins Density and Drive much
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double clamp;
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long double bridgerectifier;
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long double inputSampleL;
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long double inputSampleR;
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while (--sampleFrames >= 0)
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{
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inputSampleL = *in1;
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inputSampleR = *in2;
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if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
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static int noisesource = 0;
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//this declares a variable before anything else is compiled. It won't keep assigning
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//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
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//but it lets me add this denormalization fix in a single place rather than updating
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//it in three different locations. The variable isn't thread-safe but this is only
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//a random seed and we can share it with whatever.
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noisesource = noisesource % 1700021; noisesource++;
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int residue = noisesource * noisesource;
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residue = residue % 170003; residue *= residue;
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residue = residue % 17011; residue *= residue;
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residue = residue % 1709; residue *= residue;
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residue = residue % 173; residue *= residue;
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residue = residue % 17;
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double applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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inputSampleL = applyresidue;
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}
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if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
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static int noisesource = 0;
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noisesource = noisesource % 1700021; noisesource++;
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int residue = noisesource * noisesource;
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residue = residue % 170003; residue *= residue;
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residue = residue % 17011; residue *= residue;
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residue = residue % 1709; residue *= residue;
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residue = residue % 173; residue *= residue;
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residue = residue % 17;
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double applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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inputSampleR = applyresidue;
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//this denormalization routine produces a white noise at -300 dB which the noise
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//shaping will interact with to produce a bipolar output, but the noise is actually
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//all positive. That should stop any variables from going denormal, and the routine
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//only kicks in if digital black is input. As a final touch, if you save to 24-bit
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//the silence will return to being digital black again.
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}
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if (fpFlip)
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{
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iirSampleLA = (iirSampleLA * (1 - localiirAmount)) + (inputSampleL * localiirAmount);
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inputSampleL = inputSampleL - iirSampleLA;
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iirSampleRA = (iirSampleRA * (1 - localiirAmount)) + (inputSampleR * localiirAmount);
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inputSampleR = inputSampleR - iirSampleRA;
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}
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else
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{
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iirSampleLB = (iirSampleLB * (1 - localiirAmount)) + (inputSampleL * localiirAmount);
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inputSampleL = inputSampleL - iirSampleLB;
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iirSampleRB = (iirSampleRB * (1 - localiirAmount)) + (inputSampleR * localiirAmount);
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inputSampleR = inputSampleR - iirSampleRB;
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}
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//highpass section
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bridgerectifier = fabs(inputSampleL)*1.57079633;
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if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
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else bridgerectifier = sin(bridgerectifier);
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if (inputSampleL > 0) inputSampleL = (inputSampleL*(1-density))+(bridgerectifier*density);
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else inputSampleL = (inputSampleL*(1-density))-(bridgerectifier*density);
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bridgerectifier = fabs(inputSampleR)*1.57079633;
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if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
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else bridgerectifier = sin(bridgerectifier);
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if (inputSampleR > 0) inputSampleR = (inputSampleR*(1-density))+(bridgerectifier*density);
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else inputSampleR = (inputSampleR*(1-density))-(bridgerectifier*density);
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//drive section
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clamp = inputSampleL - lastSampleL;
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if (clamp > localthreshold)
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inputSampleL = lastSampleL + localthreshold;
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if (-clamp > localthreshold)
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inputSampleL = lastSampleL - localthreshold;
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lastSampleL = inputSampleL;
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clamp = inputSampleR - lastSampleR;
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if (clamp > localthreshold)
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inputSampleR = lastSampleR + localthreshold;
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if (-clamp > localthreshold)
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inputSampleR = lastSampleR - localthreshold;
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lastSampleR = inputSampleR;
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//slew section
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//noise shaping to 32-bit floating point
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if (fpFlip) {
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fpTemp = inputSampleL;
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fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
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inputSampleL += fpNShapeLA;
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fpTemp = inputSampleR;
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fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
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inputSampleR += fpNShapeRA;
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}
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else {
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fpTemp = inputSampleL;
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fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
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inputSampleL += fpNShapeLB;
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fpTemp = inputSampleR;
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fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
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inputSampleR += fpNShapeRB;
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}
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fpFlip = !fpFlip;
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//end noise shaping on 32 bit output
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*out1 = inputSampleL;
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*out2 = inputSampleR;
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*in1++;
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*in2++;
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*out1++;
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*out2++;
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}
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}
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void Channel4::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames)
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{
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double* in1 = inputs[0];
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double* in2 = inputs[1];
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double* out1 = outputs[0];
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double* out2 = outputs[1];
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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= getSampleRate();
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double fpTemp; //this is different from singlereplacing
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double fpOld = 0.618033988749894848204586; //golden ratio!
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double fpNew = 1.0 - fpOld;
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const double localiirAmount = iirAmount / overallscale;
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const double localthreshold = threshold / overallscale;
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const double density = pow(drive,2); //this doesn't relate to the plugins Density and Drive much
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double clamp;
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long double bridgerectifier;
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long double inputSampleL;
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long double inputSampleR;
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while (--sampleFrames >= 0)
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{
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inputSampleL = *in1;
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inputSampleR = *in2;
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if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
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static int noisesource = 0;
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//this declares a variable before anything else is compiled. It won't keep assigning
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//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
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//but it lets me add this denormalization fix in a single place rather than updating
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//it in three different locations. The variable isn't thread-safe but this is only
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//a random seed and we can share it with whatever.
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noisesource = noisesource % 1700021; noisesource++;
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int residue = noisesource * noisesource;
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residue = residue % 170003; residue *= residue;
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residue = residue % 17011; residue *= residue;
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residue = residue % 1709; residue *= residue;
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residue = residue % 173; residue *= residue;
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residue = residue % 17;
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double applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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inputSampleL = applyresidue;
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}
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if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
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static int noisesource = 0;
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noisesource = noisesource % 1700021; noisesource++;
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int residue = noisesource * noisesource;
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residue = residue % 170003; residue *= residue;
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residue = residue % 17011; residue *= residue;
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residue = residue % 1709; residue *= residue;
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residue = residue % 173; residue *= residue;
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residue = residue % 17;
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double applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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inputSampleR = applyresidue;
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//this denormalization routine produces a white noise at -300 dB which the noise
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//shaping will interact with to produce a bipolar output, but the noise is actually
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//all positive. That should stop any variables from going denormal, and the routine
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//only kicks in if digital black is input. As a final touch, if you save to 24-bit
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//the silence will return to being digital black again.
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}
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if (fpFlip)
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{
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iirSampleLA = (iirSampleLA * (1 - localiirAmount)) + (inputSampleL * localiirAmount);
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inputSampleL = inputSampleL - iirSampleLA;
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iirSampleRA = (iirSampleRA * (1 - localiirAmount)) + (inputSampleR * localiirAmount);
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inputSampleR = inputSampleR - iirSampleRA;
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}
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else
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{
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iirSampleLB = (iirSampleLB * (1 - localiirAmount)) + (inputSampleL * localiirAmount);
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inputSampleL = inputSampleL - iirSampleLB;
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iirSampleRB = (iirSampleRB * (1 - localiirAmount)) + (inputSampleR * localiirAmount);
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inputSampleR = inputSampleR - iirSampleRB;
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}
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//highpass section
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bridgerectifier = fabs(inputSampleL)*1.57079633;
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if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
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else bridgerectifier = sin(bridgerectifier);
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if (inputSampleL > 0) inputSampleL = (inputSampleL*(1-density))+(bridgerectifier*density);
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else inputSampleL = (inputSampleL*(1-density))-(bridgerectifier*density);
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bridgerectifier = fabs(inputSampleR)*1.57079633;
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if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
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else bridgerectifier = sin(bridgerectifier);
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if (inputSampleR > 0) inputSampleR = (inputSampleR*(1-density))+(bridgerectifier*density);
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else inputSampleR = (inputSampleR*(1-density))-(bridgerectifier*density);
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//drive section
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clamp = inputSampleL - lastSampleL;
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if (clamp > localthreshold)
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inputSampleL = lastSampleL + localthreshold;
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if (-clamp > localthreshold)
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inputSampleL = lastSampleL - localthreshold;
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lastSampleL = inputSampleL;
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clamp = inputSampleR - lastSampleR;
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if (clamp > localthreshold)
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inputSampleR = lastSampleR + localthreshold;
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if (-clamp > localthreshold)
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inputSampleR = lastSampleR - localthreshold;
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lastSampleR = inputSampleR;
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//slew section
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//noise shaping to 64-bit floating point
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if (fpFlip) {
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fpTemp = inputSampleL;
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fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
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inputSampleL += fpNShapeLA;
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fpTemp = inputSampleR;
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fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
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inputSampleR += fpNShapeRA;
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}
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else {
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fpTemp = inputSampleL;
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fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
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inputSampleL += fpNShapeLB;
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fpTemp = inputSampleR;
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fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
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inputSampleR += fpNShapeRB;
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}
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fpFlip = !fpFlip;
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//end noise shaping on 64 bit output
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*out1 = inputSampleL;
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*out2 = inputSampleR;
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*in1++;
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*in2++;
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*out1++;
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*out2++;
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}
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} |