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airwindows/plugins/WinVST/TapeHack2/TapeHack2Proc.cpp
Christopher Johnson fe67011732 TapeHack2
2026-01-18 15:53:19 -05:00

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/* ========================================
* TapeHack2 - TapeHack2.h
* Copyright (c) airwindows, Airwindows uses the MIT license
* ======================================== */
#ifndef __TapeHack2_H
#include "TapeHack2.h"
#endif
void TapeHack2::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 spacing = floor(overallscale*2.0);
if (spacing < 2) spacing = 2; if (spacing > 32) spacing = 32;
double inputGain = A*10.0;
double outputGain = B*0.9239;
double wet = C;
while (--sampleFrames >= 0)
{
double inputSampleL = *in1;
double inputSampleR = *in2;
if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
double drySampleL = inputSampleL;
double drySampleR = inputSampleR;
inputSampleL *= inputGain;
inputSampleR *= inputGain;
double darkSampleL = inputSampleL;
double darkSampleR = inputSampleR;
if (avgPos > 31) avgPos = 0;
if (spacing > 31) {
avg32L[avgPos] = darkSampleL; avg32R[avgPos] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 32; x++) {darkSampleL += avg32L[x]; darkSampleR += avg32R[x];}
darkSampleL /= 32.0; darkSampleR /= 32.0;
} if (spacing > 15) {
avg16L[avgPos%16] = darkSampleL; avg16R[avgPos%16] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 16; x++) {darkSampleL += avg16L[x]; darkSampleR += avg16R[x];}
darkSampleL /= 16.0; darkSampleR /= 16.0;
} if (spacing > 7) {
avg8L[avgPos%8] = darkSampleL; avg8R[avgPos%8] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 8; x++) {darkSampleL += avg8L[x]; darkSampleR += avg8R[x];}
darkSampleL /= 8.0; darkSampleR /= 8.0;
} if (spacing > 3) {
avg4L[avgPos%4] = darkSampleL; avg4R[avgPos%4] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 4; x++) {darkSampleL += avg4L[x]; darkSampleR += avg4R[x];}
darkSampleL /= 4.0; darkSampleR /= 4.0;
} if (spacing > 1) {
avg2L[avgPos%2] = darkSampleL; avg2R[avgPos%2] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 2; x++) {darkSampleL += avg2L[x]; darkSampleR += avg2R[x];}
darkSampleL /= 2.0; darkSampleR /= 2.0;
} //only update avgPos after the post-distortion filter stage
double avgSlewL = fmin(fabs(lastDarkL-inputSampleL)*0.12*overallscale,1.0);
avgSlewL = 1.0-(1.0-avgSlewL*1.0-avgSlewL);
inputSampleL = (inputSampleL*(1.0-avgSlewL)) + (darkSampleL*avgSlewL);
lastDarkL = darkSampleL;
double avgSlewR = fmin(fabs(lastDarkR-inputSampleR)*0.12*overallscale,1.0);
avgSlewR = 1.0-(1.0-avgSlewR*1.0-avgSlewR);
inputSampleR = (inputSampleR*(1.0-avgSlewR)) + (darkSampleR*avgSlewR);
lastDarkR = darkSampleR;
inputSampleL = fmax(fmin(inputSampleL,2.305929007734908),-2.305929007734908);
double addtwo = inputSampleL * inputSampleL;
double empower = inputSampleL * addtwo; // inputSampleL to the third power
inputSampleL -= (empower / 6.0);
empower *= addtwo; // to the fifth power
inputSampleL += (empower / 69.0);
empower *= addtwo; //seventh
inputSampleL -= (empower / 2530.08);
empower *= addtwo; //ninth
inputSampleL += (empower / 224985.6);
empower *= addtwo; //eleventh
inputSampleL -= (empower / 9979200.0f);
//this is a degenerate form of a Taylor Series to approximate sin()
inputSampleR = fmax(fmin(inputSampleR,2.305929007734908),-2.305929007734908);
addtwo = inputSampleR * inputSampleR;
empower = inputSampleR * addtwo; // inputSampleR to the third power
inputSampleR -= (empower / 6.0);
empower *= addtwo; // to the fifth power
inputSampleR += (empower / 69.0);
empower *= addtwo; //seventh
inputSampleR -= (empower / 2530.08);
empower *= addtwo; //ninth
inputSampleR += (empower / 224985.6);
empower *= addtwo; //eleventh
inputSampleR -= (empower / 9979200.0f);
//this is a degenerate form of a Taylor Series to approximate sin()
darkSampleL = inputSampleL;
darkSampleR = inputSampleR;
if (avgPos > 31) avgPos = 0;
if (spacing > 31) {
post32L[avgPos] = darkSampleL; post32R[avgPos] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 32; x++) {darkSampleL += post32L[x]; darkSampleR += post32R[x];}
darkSampleL /= 32.0; darkSampleR /= 32.0;
} if (spacing > 15) {
post16L[avgPos%16] = darkSampleL; post16R[avgPos%16] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 16; x++) {darkSampleL += post16L[x]; darkSampleR += post16R[x];}
darkSampleL /= 16.0; darkSampleR /= 16.0;
} if (spacing > 7) {
post8L[avgPos%8] = darkSampleL; post8R[avgPos%8] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 8; x++) {darkSampleL += post8L[x]; darkSampleR += post8R[x];}
darkSampleL /= 8.0; darkSampleR /= 8.0;
} if (spacing > 3) {
post4L[avgPos%4] = darkSampleL; post4R[avgPos%4] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 4; x++) {darkSampleL += post4L[x]; darkSampleR += post4R[x];}
darkSampleL /= 4.0; darkSampleR /= 4.0;
} if (spacing > 1) {
post2L[avgPos%2] = darkSampleL; post2R[avgPos%2] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 2; x++) {darkSampleL += post2L[x]; darkSampleR += post2R[x];}
darkSampleL /= 2.0; darkSampleR /= 2.0;
} avgPos++;
inputSampleL = (inputSampleL*(1.0-avgSlewL)) + (darkSampleL*avgSlewL);
inputSampleR = (inputSampleR*(1.0-avgSlewR)) + (darkSampleR*avgSlewR);
//use the previously calculated depth of the filter
inputSampleL = (inputSampleL * outputGain * wet) + (drySampleL * (1.0-wet));
inputSampleR = (inputSampleR * outputGain * wet) + (drySampleR * (1.0-wet));
//begin 32 bit stereo floating point dither
int expon; frexpf((float)inputSampleL, &expon);
fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
frexpf((float)inputSampleR, &expon);
fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
//end 32 bit stereo floating point dither
*out1 = inputSampleL;
*out2 = inputSampleR;
in1++;
in2++;
out1++;
out2++;
}
}
void TapeHack2::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 spacing = floor(overallscale*2.0);
if (spacing < 2) spacing = 2; if (spacing > 32) spacing = 32;
double inputGain = A*10.0;
double outputGain = B*0.9239;
double wet = C;
while (--sampleFrames >= 0)
{
double inputSampleL = *in1;
double inputSampleR = *in2;
if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
double drySampleL = inputSampleL;
double drySampleR = inputSampleR;
inputSampleL *= inputGain;
inputSampleR *= inputGain;
double darkSampleL = inputSampleL;
double darkSampleR = inputSampleR;
if (avgPos > 31) avgPos = 0;
if (spacing > 31) {
avg32L[avgPos] = darkSampleL; avg32R[avgPos] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 32; x++) {darkSampleL += avg32L[x]; darkSampleR += avg32R[x];}
darkSampleL /= 32.0; darkSampleR /= 32.0;
} if (spacing > 15) {
avg16L[avgPos%16] = darkSampleL; avg16R[avgPos%16] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 16; x++) {darkSampleL += avg16L[x]; darkSampleR += avg16R[x];}
darkSampleL /= 16.0; darkSampleR /= 16.0;
} if (spacing > 7) {
avg8L[avgPos%8] = darkSampleL; avg8R[avgPos%8] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 8; x++) {darkSampleL += avg8L[x]; darkSampleR += avg8R[x];}
darkSampleL /= 8.0; darkSampleR /= 8.0;
} if (spacing > 3) {
avg4L[avgPos%4] = darkSampleL; avg4R[avgPos%4] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 4; x++) {darkSampleL += avg4L[x]; darkSampleR += avg4R[x];}
darkSampleL /= 4.0; darkSampleR /= 4.0;
} if (spacing > 1) {
avg2L[avgPos%2] = darkSampleL; avg2R[avgPos%2] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 2; x++) {darkSampleL += avg2L[x]; darkSampleR += avg2R[x];}
darkSampleL /= 2.0; darkSampleR /= 2.0;
} //only update avgPos after the post-distortion filter stage
double avgSlewL = fmin(fabs(lastDarkL-inputSampleL)*0.12*overallscale,1.0);
avgSlewL = 1.0-(1.0-avgSlewL*1.0-avgSlewL);
inputSampleL = (inputSampleL*(1.0-avgSlewL)) + (darkSampleL*avgSlewL);
lastDarkL = darkSampleL;
double avgSlewR = fmin(fabs(lastDarkR-inputSampleR)*0.12*overallscale,1.0);
avgSlewR = 1.0-(1.0-avgSlewR*1.0-avgSlewR);
inputSampleR = (inputSampleR*(1.0-avgSlewR)) + (darkSampleR*avgSlewR);
lastDarkR = darkSampleR;
inputSampleL = fmax(fmin(inputSampleL,2.305929007734908),-2.305929007734908);
double addtwo = inputSampleL * inputSampleL;
double empower = inputSampleL * addtwo; // inputSampleL to the third power
inputSampleL -= (empower / 6.0);
empower *= addtwo; // to the fifth power
inputSampleL += (empower / 69.0);
empower *= addtwo; //seventh
inputSampleL -= (empower / 2530.08);
empower *= addtwo; //ninth
inputSampleL += (empower / 224985.6);
empower *= addtwo; //eleventh
inputSampleL -= (empower / 9979200.0f);
//this is a degenerate form of a Taylor Series to approximate sin()
inputSampleR = fmax(fmin(inputSampleR,2.305929007734908),-2.305929007734908);
addtwo = inputSampleR * inputSampleR;
empower = inputSampleR * addtwo; // inputSampleR to the third power
inputSampleR -= (empower / 6.0);
empower *= addtwo; // to the fifth power
inputSampleR += (empower / 69.0);
empower *= addtwo; //seventh
inputSampleR -= (empower / 2530.08);
empower *= addtwo; //ninth
inputSampleR += (empower / 224985.6);
empower *= addtwo; //eleventh
inputSampleR -= (empower / 9979200.0f);
//this is a degenerate form of a Taylor Series to approximate sin()
darkSampleL = inputSampleL;
darkSampleR = inputSampleR;
if (avgPos > 31) avgPos = 0;
if (spacing > 31) {
post32L[avgPos] = darkSampleL; post32R[avgPos] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 32; x++) {darkSampleL += post32L[x]; darkSampleR += post32R[x];}
darkSampleL /= 32.0; darkSampleR /= 32.0;
} if (spacing > 15) {
post16L[avgPos%16] = darkSampleL; post16R[avgPos%16] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 16; x++) {darkSampleL += post16L[x]; darkSampleR += post16R[x];}
darkSampleL /= 16.0; darkSampleR /= 16.0;
} if (spacing > 7) {
post8L[avgPos%8] = darkSampleL; post8R[avgPos%8] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 8; x++) {darkSampleL += post8L[x]; darkSampleR += post8R[x];}
darkSampleL /= 8.0; darkSampleR /= 8.0;
} if (spacing > 3) {
post4L[avgPos%4] = darkSampleL; post4R[avgPos%4] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 4; x++) {darkSampleL += post4L[x]; darkSampleR += post4R[x];}
darkSampleL /= 4.0; darkSampleR /= 4.0;
} if (spacing > 1) {
post2L[avgPos%2] = darkSampleL; post2R[avgPos%2] = darkSampleR;
darkSampleL = 0.0; darkSampleR = 0.0;
for (int x = 0; x < 2; x++) {darkSampleL += post2L[x]; darkSampleR += post2R[x];}
darkSampleL /= 2.0; darkSampleR /= 2.0;
} avgPos++;
inputSampleL = (inputSampleL*(1.0-avgSlewL)) + (darkSampleL*avgSlewL);
inputSampleR = (inputSampleR*(1.0-avgSlewR)) + (darkSampleR*avgSlewR);
//use the previously calculated depth of the filter
inputSampleL = (inputSampleL * outputGain * wet) + (drySampleL * (1.0-wet));
inputSampleR = (inputSampleR * outputGain * wet) + (drySampleR * (1.0-wet));
//begin 64 bit stereo floating point dither
//int expon; frexp((double)inputSampleL, &expon);
fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
//inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
//frexp((double)inputSampleR, &expon);
fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
//inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
//end 64 bit stereo floating point dither
*out1 = inputSampleL;
*out2 = inputSampleR;
in1++;
in2++;
out1++;
out2++;
}
}
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