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airwindows/plugins/WinVST/ToTape9/ToTape9Proc.cpp
Christopher Johnson 198d0ac4f9 Slew4
2026-03-07 19:56:29 -05:00

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/* ========================================
* ToTape9 - ToTape9.h
* Copyright (c) airwindows, Airwindows uses the MIT license
* ======================================== */
#ifndef __ToTape9_H
#include "ToTape9.h"
#endif
void ToTape9::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); //should give us working basic scaling, usually 2 or 4
if (spacing < 1) spacing = 1; if (spacing > 16) spacing = 16;
int slewsing = floor(overallscale*2.0);
if (slewsing < 2) slewsing = 2; if (slewsing > 32) slewsing = 32;
double inputGain = pow(A*2.0,2.0);
double dublyAmount = B*2.0;
double outlyAmount = (1.0-B)*-2.0;
if (outlyAmount < -1.0) outlyAmount = -1.0;
double iirEncFreq = (1.0-C)/overallscale;
double iirDecFreq = C/overallscale;
double flutDepth = pow(D,6)*overallscale*50;
if (flutDepth > 498.0) flutDepth = 498.0;
double flutFrequency = (0.02*pow(E,3))/overallscale;
double bias = (F*2.0)-1.0;
double underBias = (pow(bias,4)*0.25)/overallscale;
double overBias = pow(1.0-bias,3)/overallscale;
if (bias > 0.0) underBias = 0.0;
if (bias < 0.0) overBias = 1.0/overallscale;
gslew[threshold9] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold8] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold7] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold6] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold5] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold4] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold3] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold2] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold1] = overBias;
overBias *= 1.618033988749894848204586;
double headBumpDrive = (G*0.1)/overallscale;
double headBumpMix = G*0.5;
hdbA[hdb_freq] = (((H*H)*175.0)+25.0)/getSampleRate();
hdbB[hdb_freq] = hdbA[hdb_freq]*0.9375;
hdbB[hdb_reso] = hdbA[hdb_reso] = 0.618033988749894848204586;
hdbB[hdb_a1] = hdbA[hdb_a1] = 0.0;
double K = tan(M_PI * hdbA[hdb_freq]);
double norm = 1.0 / (1.0 + K / hdbA[hdb_reso] + K * K);
hdbA[hdb_a0] = K / hdbA[hdb_reso] * norm;
hdbA[hdb_a2] = -hdbA[hdb_a0];
hdbA[hdb_b1] = 2.0 * (K * K - 1.0) * norm;
hdbA[hdb_b2] = (1.0 - K / hdbA[hdb_reso] + K * K) * norm;
K = tan(M_PI * hdbB[hdb_freq]);
norm = 1.0 / (1.0 + K / hdbB[hdb_reso] + K * K);
hdbB[hdb_a0] = K / hdbB[hdb_reso] * norm;
hdbB[hdb_a2] = -hdbB[hdb_a0];
hdbB[hdb_b1] = 2.0 * (K * K - 1.0) * norm;
hdbB[hdb_b2] = (1.0 - K / hdbB[hdb_reso] + K * K) * norm;
double outputGain = I*2.0;
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;
if (inputGain != 1.0) {
inputSampleL *= inputGain;
inputSampleR *= inputGain;
}
//Dubly encode
iirEncL = (iirEncL * (1.0 - iirEncFreq)) + (inputSampleL * iirEncFreq);
double highPart = ((inputSampleL-iirEncL)*2.848);
highPart += avgEncL; avgEncL = (inputSampleL-iirEncL)*1.152;
if (highPart > 1.0) highPart = 1.0; if (highPart < -1.0) highPart = -1.0;
double dubly = fabs(highPart);
if (dubly > 0.0) {
double adjust = log(1.0+(255.0*dubly))/2.40823996531;
if (adjust > 0.0) dubly /= adjust;
compEncL = (compEncL*(1.0-iirEncFreq))+(dubly*iirEncFreq);
inputSampleL += ((highPart*compEncL)*dublyAmount);
} //end Dubly encode L
iirEncR = (iirEncR * (1.0 - iirEncFreq)) + (inputSampleR * iirEncFreq);
highPart = ((inputSampleR-iirEncR)*2.848);
highPart += avgEncR; avgEncR = (inputSampleR-iirEncR)*1.152;
if (highPart > 1.0) highPart = 1.0; if (highPart < -1.0) highPart = -1.0;
dubly = fabs(highPart);
if (dubly > 0.0) {
double adjust = log(1.0+(255.0*dubly))/2.40823996531;
if (adjust > 0.0) dubly /= adjust;
compEncR = (compEncR*(1.0-iirEncFreq))+(dubly*iirEncFreq);
inputSampleR += ((highPart*compEncR)*dublyAmount);
} //end Dubly encode R
//begin Flutter
if (flutDepth > 0.0) {
if (gcount < 0 || gcount > 999) gcount = 999;
dL[gcount] = inputSampleL;
int count = gcount;
double offset = flutDepth + (flutDepth * sin(sweepL));
sweepL += nextmaxL * flutFrequency;
if (sweepL > (M_PI*2.0)) {
sweepL -= M_PI*2.0;
double flutA = 0.24 + (fpdL / (double)UINT32_MAX * 0.74);
fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
double flutB = 0.24 + (fpdL / (double)UINT32_MAX * 0.74);
if (fabs(flutA-sin(sweepR+nextmaxR))<fabs(flutB-sin(sweepR+nextmaxR))) nextmaxL = flutA; else nextmaxL = flutB;
}
count += (int)floor(offset);
inputSampleL = (dL[count-((count > 999)?1000:0)] * (1-(offset-floor(offset))));
inputSampleL += (dL[count+1-((count+1 > 999)?1000:0)] * (offset-floor(offset)));
dR[gcount] = inputSampleR;
count = gcount;
offset = flutDepth + (flutDepth * sin(sweepR));
sweepR += nextmaxR * flutFrequency;
if (sweepR > (M_PI*2.0)) {
sweepR -= M_PI*2.0;
double flutA = 0.24 + (fpdR / (double)UINT32_MAX * 0.74);
fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
double flutB = 0.24 + (fpdR / (double)UINT32_MAX * 0.74);
if (fabs(flutA-sin(sweepL+nextmaxL))<fabs(flutB-sin(sweepL+nextmaxL))) nextmaxR = flutA; else nextmaxR = flutB;
}
count += (int)floor(offset);
inputSampleR = (dR[count-((count > 999)?1000:0)] * (1-(offset-floor(offset))));
inputSampleR += (dR[count+1-((count+1 > 999)?1000:0)] * (offset-floor(offset)));
gcount--;
}
//end Flutter
//start bias routine
if (fabs(bias) > 0.001) {
for (int x = 0; x < gslew_total; x += 3) {
if (underBias > 0.0) {
double stuck = fabs(inputSampleL - (gslew[x]/0.975)) / underBias;
if (stuck < 1.0) inputSampleL = (inputSampleL * stuck) + ((gslew[x]/0.975)*(1.0-stuck));
stuck = fabs(inputSampleR - (gslew[x+1]/0.975)) / underBias;
if (stuck < 1.0) inputSampleR = (inputSampleR * stuck) + ((gslew[x+1]/0.975)*(1.0-stuck));
}
if ((inputSampleL - gslew[x]) > gslew[x+2]) inputSampleL = gslew[x] + gslew[x+2];
if (-(inputSampleL - gslew[x]) > gslew[x+2]) inputSampleL = gslew[x] - gslew[x+2];
gslew[x] = inputSampleL * 0.975;
if ((inputSampleR - gslew[x+1]) > gslew[x+2]) inputSampleR = gslew[x+1] + gslew[x+2];
if (-(inputSampleR - gslew[x+1]) > gslew[x+2]) inputSampleR = gslew[x+1] - gslew[x+2];
gslew[x+1] = inputSampleR * 0.975;
}
}
//end bias routine
//begin tiny hysteresis
double applyHysteresis = (1.0-fabs(inputSampleL))*(1.0-fabs(inputSampleL))*0.012;
hysteresisL = fmax(fmin(hysteresisL+((inputSampleL*fabs(inputSampleL))),0.011449),-0.011449)*0.999;
inputSampleL += (hysteresisL*applyHysteresis);
applyHysteresis = (1.0-fabs(inputSampleR))*(1.0-fabs(inputSampleR))*0.012;
hysteresisR = fmax(fmin(hysteresisR+((inputSampleR*fabs(inputSampleR))),0.011449),-0.011449)*0.999;
inputSampleR += (hysteresisR*applyHysteresis);
//begin TapeHack2
double darkSampleL = inputSampleL;
double darkSampleR = inputSampleR;
if (avgPos > 31) avgPos = 0;
if (slewsing > 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 (slewsing > 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 (slewsing > 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 (slewsing > 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 (slewsing > 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;
//begin TapeHack
inputSampleL = fmax(fmin(inputSampleL,2.305929007734908),-2.305929007734908);
double addtwo = inputSampleL * inputSampleL;
double empower = inputSampleL * addtwo; // inputSample 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; // inputSample 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 (slewsing > 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 (slewsing > 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 (slewsing > 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 (slewsing > 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 (slewsing > 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
//begin HeadBump
double headBumpSampleL = 0.0;
double headBumpSampleR = 0.0;
if (headBumpMix > 0.0) {
headBumpL += (inputSampleL * headBumpDrive);
headBumpL -= (headBumpL * headBumpL * headBumpL * (0.0618/sqrt(overallscale)));
headBumpR += (inputSampleR * headBumpDrive);
headBumpR -= (headBumpR * headBumpR * headBumpR * (0.0618/sqrt(overallscale)));
double headBiqSampleL = (headBumpL * hdbA[hdb_a0]) + hdbA[hdb_sL1];
hdbA[hdb_sL1] = (headBumpL * hdbA[hdb_a1]) - (headBiqSampleL * hdbA[hdb_b1]) + hdbA[hdb_sL2];
hdbA[hdb_sL2] = (headBumpL * hdbA[hdb_a2]) - (headBiqSampleL * hdbA[hdb_b2]);
headBumpSampleL = (headBiqSampleL * hdbB[hdb_a0]) + hdbB[hdb_sL1];
hdbB[hdb_sL1] = (headBiqSampleL * hdbB[hdb_a1]) - (headBumpSampleL * hdbB[hdb_b1]) + hdbB[hdb_sL2];
hdbB[hdb_sL2] = (headBiqSampleL * hdbB[hdb_a2]) - (headBumpSampleL * hdbB[hdb_b2]);
double headBiqSampleR = (headBumpR * hdbA[hdb_a0]) + hdbA[hdb_sR1];
hdbA[hdb_sR1] = (headBumpR * hdbA[hdb_a1]) - (headBiqSampleR * hdbA[hdb_b1]) + hdbA[hdb_sR2];
hdbA[hdb_sR2] = (headBumpR * hdbA[hdb_a2]) - (headBiqSampleR * hdbA[hdb_b2]);
headBumpSampleR = (headBiqSampleR * hdbB[hdb_a0]) + hdbB[hdb_sR1];
hdbB[hdb_sR1] = (headBiqSampleR * hdbB[hdb_a1]) - (headBumpSampleR * hdbB[hdb_b1]) + hdbB[hdb_sR2];
hdbB[hdb_sR2] = (headBiqSampleR * hdbB[hdb_a2]) - (headBumpSampleR * hdbB[hdb_b2]);
}
//end HeadBump
inputSampleL += (headBumpSampleL * headBumpMix);
inputSampleR += (headBumpSampleR * headBumpMix);
//Dubly decode
iirDecL = (iirDecL * (1.0 - iirDecFreq)) + (inputSampleL * iirDecFreq);
highPart = ((inputSampleL-iirDecL)*2.628);
highPart += avgDecL; avgDecL = (inputSampleL-iirDecL)*1.372;
if (highPart > 1.0) highPart = 1.0; if (highPart < -1.0) highPart = -1.0;
dubly = fabs(highPart);
if (dubly > 0.0) {
double adjust = log(1.0+(255.0*dubly))/2.40823996531;
if (adjust > 0.0) dubly /= adjust;
compDecL = (compDecL*(1.0-iirDecFreq))+(dubly*iirDecFreq);
inputSampleL += ((highPart*compDecL)*outlyAmount);
} //end Dubly decode L
iirDecR = (iirDecR * (1.0 - iirDecFreq)) + (inputSampleR * iirDecFreq);
highPart = ((inputSampleR-iirDecR)*2.628);
highPart += avgDecR; avgDecR = (inputSampleR-iirDecR)*1.372;
if (highPart > 1.0) highPart = 1.0; if (highPart < -1.0) highPart = -1.0;
dubly = fabs(highPart);
if (dubly > 0.0) {
double adjust = log(1.0+(255.0*dubly))/2.40823996531;
if (adjust > 0.0) dubly /= adjust;
compDecR = (compDecR*(1.0-iirDecFreq))+(dubly*iirDecFreq);
inputSampleR += ((highPart*compDecR)*outlyAmount);
} //end Dubly decode R
if (outputGain != 1.0) {
inputSampleL *= outputGain;
inputSampleR *= outputGain;
}
//begin ClipOnly3 as a little, compressed chunk that can be dropped into code
double noise = 1.0-((double(fpdL)/UINT32_MAX)*0.076);
if (wasPosClipL == true) { //current will be over
if (inputSampleL<lastSampleL) lastSampleL=(0.9085097*noise)+(inputSampleL*(1.0-noise));
else lastSampleL = 0.94; //~-0.2dB to nearly match ClipOnly and ClipOnly2
} wasPosClipL = false;
if (inputSampleL>0.9085097) {wasPosClipL=true;inputSampleL=(0.9085097*noise)+(lastSampleL*(1.0-noise));}
if (wasNegClipL == true) { //current will be -over
if (inputSampleL > lastSampleL) lastSampleL=(-0.9085097*noise)+(inputSampleL*(1.0-noise));
else lastSampleL = -0.94;
} wasNegClipL = false;
if (inputSampleL<-0.9085097) {wasNegClipL=true;inputSampleL=(-0.9085097*noise)+(lastSampleL*(1.0-noise));}
slewL[spacing*2] = fabs(lastSampleL-inputSampleL);
for (int x = spacing*2; x > 0; x--) slewL[x-1] = slewL[x];
intermediateL[spacing] = inputSampleL; inputSampleL = lastSampleL;
//latency is however many samples equals one 44.1k sample
for (int x = spacing; x > 0; x--) {intermediateL[x-1] = intermediateL[x];} lastSampleL = intermediateL[0];
if (wasPosClipL || wasNegClipL) {
for (int x = spacing; x > 0; x--) lastSampleL += intermediateL[x];
lastSampleL /= spacing;
} double finalSlew = 0.0;
for (int x = spacing*2; x >= 0; x--) if (finalSlew < slewL[x]) finalSlew = slewL[x];
double postclip = 0.94 / (1.0+(finalSlew*1.3986013));
if (inputSampleL > postclip) inputSampleL = postclip; if (inputSampleL < -postclip) inputSampleL = -postclip;
noise = 1.0-((double(fpdR)/UINT32_MAX)*0.076);
if (wasPosClipR == true) { //current will be over
if (inputSampleR<lastSampleR) lastSampleR=(0.9085097*noise)+(inputSampleR*(1.0-noise));
else lastSampleR = 0.94; //~-0.2dB to nearly match ClipOnly and ClipOnly2
} wasPosClipR = false;
if (inputSampleR>0.9085097) {wasPosClipR=true;inputSampleR=(0.9085097*noise)+(lastSampleR*(1.0-noise));}
if (wasNegClipR == true) { //current will be -over
if (inputSampleR > lastSampleR) lastSampleR=(-0.9085097*noise)+(inputSampleR*(1.0-noise));
else lastSampleR = -0.94;
} wasNegClipR = false;
if (inputSampleR<-0.9085097) {wasNegClipR=true;inputSampleR=(-0.9085097*noise)+(lastSampleR*(1.0-noise));}
slewR[spacing*2] = fabs(lastSampleR-inputSampleR);
for (int x = spacing*2; x > 0; x--) slewR[x-1] = slewR[x];
intermediateR[spacing] = inputSampleR; inputSampleR = lastSampleR;
//latency is however many samples equals one 44.1k sample
for (int x = spacing; x > 0; x--) {intermediateR[x-1] = intermediateR[x];} lastSampleR = intermediateR[0];
if (wasPosClipR || wasNegClipR) {
for (int x = spacing; x > 0; x--) lastSampleR += intermediateR[x];
lastSampleR /= spacing;
} finalSlew = 0.0;
for (int x = spacing*2; x >= 0; x--) if (finalSlew < slewR[x]) finalSlew = slewR[x];
postclip = 0.94 / (1.0+(finalSlew*1.3986013));
if (inputSampleR > postclip) inputSampleR = postclip; if (inputSampleR < -postclip) inputSampleR = -postclip;
//end ClipOnly3 as a little, compressed chunk that can be dropped into code
//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 ToTape9::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); //should give us working basic scaling, usually 2 or 4
if (spacing < 1) spacing = 1; if (spacing > 16) spacing = 16;
int slewsing = floor(overallscale*2.0);
if (slewsing < 2) slewsing = 2; if (slewsing > 32) slewsing = 32;
double inputGain = pow(A*2.0,2.0);
double dublyAmount = B*2.0;
double outlyAmount = (1.0-B)*-2.0;
if (outlyAmount < -1.0) outlyAmount = -1.0;
double iirEncFreq = (1.0-C)/overallscale;
double iirDecFreq = C/overallscale;
double flutDepth = pow(D,6)*overallscale*50;
if (flutDepth > 498.0) flutDepth = 498.0;
double flutFrequency = (0.02*pow(E,3))/overallscale;
double bias = (F*2.0)-1.0;
double underBias = (pow(bias,4)*0.25)/overallscale;
double overBias = pow(1.0-bias,3)/overallscale;
if (bias > 0.0) underBias = 0.0;
if (bias < 0.0) overBias = 1.0/overallscale;
gslew[threshold9] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold8] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold7] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold6] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold5] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold4] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold3] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold2] = overBias;
overBias *= 1.618033988749894848204586;
gslew[threshold1] = overBias;
overBias *= 1.618033988749894848204586;
double headBumpDrive = (G*0.1)/overallscale;
double headBumpMix = G*0.5;
hdbA[hdb_freq] = (((H*H)*175.0)+25.0)/getSampleRate();
hdbB[hdb_freq] = hdbA[hdb_freq]*0.9375;
hdbB[hdb_reso] = hdbA[hdb_reso] = 0.618033988749894848204586;
hdbB[hdb_a1] = hdbA[hdb_a1] = 0.0;
double K = tan(M_PI * hdbA[hdb_freq]);
double norm = 1.0 / (1.0 + K / hdbA[hdb_reso] + K * K);
hdbA[hdb_a0] = K / hdbA[hdb_reso] * norm;
hdbA[hdb_a2] = -hdbA[hdb_a0];
hdbA[hdb_b1] = 2.0 * (K * K - 1.0) * norm;
hdbA[hdb_b2] = (1.0 - K / hdbA[hdb_reso] + K * K) * norm;
K = tan(M_PI * hdbB[hdb_freq]);
norm = 1.0 / (1.0 + K / hdbB[hdb_reso] + K * K);
hdbB[hdb_a0] = K / hdbB[hdb_reso] * norm;
hdbB[hdb_a2] = -hdbB[hdb_a0];
hdbB[hdb_b1] = 2.0 * (K * K - 1.0) * norm;
hdbB[hdb_b2] = (1.0 - K / hdbB[hdb_reso] + K * K) * norm;
double outputGain = I*2.0;
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;
if (inputGain != 1.0) {
inputSampleL *= inputGain;
inputSampleR *= inputGain;
}
//Dubly encode
iirEncL = (iirEncL * (1.0 - iirEncFreq)) + (inputSampleL * iirEncFreq);
double highPart = ((inputSampleL-iirEncL)*2.848);
highPart += avgEncL; avgEncL = (inputSampleL-iirEncL)*1.152;
if (highPart > 1.0) highPart = 1.0; if (highPart < -1.0) highPart = -1.0;
double dubly = fabs(highPart);
if (dubly > 0.0) {
double adjust = log(1.0+(255.0*dubly))/2.40823996531;
if (adjust > 0.0) dubly /= adjust;
compEncL = (compEncL*(1.0-iirEncFreq))+(dubly*iirEncFreq);
inputSampleL += ((highPart*compEncL)*dublyAmount);
} //end Dubly encode L
iirEncR = (iirEncR * (1.0 - iirEncFreq)) + (inputSampleR * iirEncFreq);
highPart = ((inputSampleR-iirEncR)*2.848);
highPart += avgEncR; avgEncR = (inputSampleR-iirEncR)*1.152;
if (highPart > 1.0) highPart = 1.0; if (highPart < -1.0) highPart = -1.0;
dubly = fabs(highPart);
if (dubly > 0.0) {
double adjust = log(1.0+(255.0*dubly))/2.40823996531;
if (adjust > 0.0) dubly /= adjust;
compEncR = (compEncR*(1.0-iirEncFreq))+(dubly*iirEncFreq);
inputSampleR += ((highPart*compEncR)*dublyAmount);
} //end Dubly encode R
//begin Flutter
if (flutDepth > 0.0) {
if (gcount < 0 || gcount > 999) gcount = 999;
dL[gcount] = inputSampleL;
int count = gcount;
double offset = flutDepth + (flutDepth * sin(sweepL));
sweepL += nextmaxL * flutFrequency;
if (sweepL > (M_PI*2.0)) {
sweepL -= M_PI*2.0;
double flutA = 0.24 + (fpdL / (double)UINT32_MAX * 0.74);
fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
double flutB = 0.24 + (fpdL / (double)UINT32_MAX * 0.74);
if (fabs(flutA-sin(sweepR+nextmaxR))<fabs(flutB-sin(sweepR+nextmaxR))) nextmaxL = flutA; else nextmaxL = flutB;
}
count += (int)floor(offset);
inputSampleL = (dL[count-((count > 999)?1000:0)] * (1-(offset-floor(offset))));
inputSampleL += (dL[count+1-((count+1 > 999)?1000:0)] * (offset-floor(offset)));
dR[gcount] = inputSampleR;
count = gcount;
offset = flutDepth + (flutDepth * sin(sweepR));
sweepR += nextmaxR * flutFrequency;
if (sweepR > (M_PI*2.0)) {
sweepR -= M_PI*2.0;
double flutA = 0.24 + (fpdR / (double)UINT32_MAX * 0.74);
fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
double flutB = 0.24 + (fpdR / (double)UINT32_MAX * 0.74);
if (fabs(flutA-sin(sweepL+nextmaxL))<fabs(flutB-sin(sweepL+nextmaxL))) nextmaxR = flutA; else nextmaxR = flutB;
}
count += (int)floor(offset);
inputSampleR = (dR[count-((count > 999)?1000:0)] * (1-(offset-floor(offset))));
inputSampleR += (dR[count+1-((count+1 > 999)?1000:0)] * (offset-floor(offset)));
gcount--;
}
//end Flutter
//start bias routine
if (fabs(bias) > 0.001) {
for (int x = 0; x < gslew_total; x += 3) {
if (underBias > 0.0) {
double stuck = fabs(inputSampleL - (gslew[x]/0.975)) / underBias;
if (stuck < 1.0) inputSampleL = (inputSampleL * stuck) + ((gslew[x]/0.975)*(1.0-stuck));
stuck = fabs(inputSampleR - (gslew[x+1]/0.975)) / underBias;
if (stuck < 1.0) inputSampleR = (inputSampleR * stuck) + ((gslew[x+1]/0.975)*(1.0-stuck));
}
if ((inputSampleL - gslew[x]) > gslew[x+2]) inputSampleL = gslew[x] + gslew[x+2];
if (-(inputSampleL - gslew[x]) > gslew[x+2]) inputSampleL = gslew[x] - gslew[x+2];
gslew[x] = inputSampleL * 0.975;
if ((inputSampleR - gslew[x+1]) > gslew[x+2]) inputSampleR = gslew[x+1] + gslew[x+2];
if (-(inputSampleR - gslew[x+1]) > gslew[x+2]) inputSampleR = gslew[x+1] - gslew[x+2];
gslew[x+1] = inputSampleR * 0.975;
}
}
//end bias routine
//begin tiny hysteresis
double applyHysteresis = (1.0-fabs(inputSampleL))*(1.0-fabs(inputSampleL))*0.012;
hysteresisL = fmax(fmin(hysteresisL+((inputSampleL*fabs(inputSampleL))),0.011449),-0.011449)*0.999;
inputSampleL += (hysteresisL*applyHysteresis);
applyHysteresis = (1.0-fabs(inputSampleR))*(1.0-fabs(inputSampleR))*0.012;
hysteresisR = fmax(fmin(hysteresisR+((inputSampleR*fabs(inputSampleR))),0.011449),-0.011449)*0.999;
inputSampleR += (hysteresisR*applyHysteresis);
//begin TapeHack2
double darkSampleL = inputSampleL;
double darkSampleR = inputSampleR;
if (avgPos > 31) avgPos = 0;
if (slewsing > 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 (slewsing > 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 (slewsing > 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 (slewsing > 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 (slewsing > 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;
//begin TapeHack
inputSampleL = fmax(fmin(inputSampleL,2.305929007734908),-2.305929007734908);
double addtwo = inputSampleL * inputSampleL;
double empower = inputSampleL * addtwo; // inputSample 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; // inputSample 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 (slewsing > 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 (slewsing > 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 (slewsing > 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 (slewsing > 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 (slewsing > 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
//begin HeadBump
double headBumpSampleL = 0.0;
double headBumpSampleR = 0.0;
if (headBumpMix > 0.0) {
headBumpL += (inputSampleL * headBumpDrive);
headBumpL -= (headBumpL * headBumpL * headBumpL * (0.0618/sqrt(overallscale)));
headBumpR += (inputSampleR * headBumpDrive);
headBumpR -= (headBumpR * headBumpR * headBumpR * (0.0618/sqrt(overallscale)));
double headBiqSampleL = (headBumpL * hdbA[hdb_a0]) + hdbA[hdb_sL1];
hdbA[hdb_sL1] = (headBumpL * hdbA[hdb_a1]) - (headBiqSampleL * hdbA[hdb_b1]) + hdbA[hdb_sL2];
hdbA[hdb_sL2] = (headBumpL * hdbA[hdb_a2]) - (headBiqSampleL * hdbA[hdb_b2]);
headBumpSampleL = (headBiqSampleL * hdbB[hdb_a0]) + hdbB[hdb_sL1];
hdbB[hdb_sL1] = (headBiqSampleL * hdbB[hdb_a1]) - (headBumpSampleL * hdbB[hdb_b1]) + hdbB[hdb_sL2];
hdbB[hdb_sL2] = (headBiqSampleL * hdbB[hdb_a2]) - (headBumpSampleL * hdbB[hdb_b2]);
double headBiqSampleR = (headBumpR * hdbA[hdb_a0]) + hdbA[hdb_sR1];
hdbA[hdb_sR1] = (headBumpR * hdbA[hdb_a1]) - (headBiqSampleR * hdbA[hdb_b1]) + hdbA[hdb_sR2];
hdbA[hdb_sR2] = (headBumpR * hdbA[hdb_a2]) - (headBiqSampleR * hdbA[hdb_b2]);
headBumpSampleR = (headBiqSampleR * hdbB[hdb_a0]) + hdbB[hdb_sR1];
hdbB[hdb_sR1] = (headBiqSampleR * hdbB[hdb_a1]) - (headBumpSampleR * hdbB[hdb_b1]) + hdbB[hdb_sR2];
hdbB[hdb_sR2] = (headBiqSampleR * hdbB[hdb_a2]) - (headBumpSampleR * hdbB[hdb_b2]);
}
//end HeadBump
inputSampleL += (headBumpSampleL * headBumpMix);
inputSampleR += (headBumpSampleR * headBumpMix);
//Dubly decode
iirDecL = (iirDecL * (1.0 - iirDecFreq)) + (inputSampleL * iirDecFreq);
highPart = ((inputSampleL-iirDecL)*2.628);
highPart += avgDecL; avgDecL = (inputSampleL-iirDecL)*1.372;
if (highPart > 1.0) highPart = 1.0; if (highPart < -1.0) highPart = -1.0;
dubly = fabs(highPart);
if (dubly > 0.0) {
double adjust = log(1.0+(255.0*dubly))/2.40823996531;
if (adjust > 0.0) dubly /= adjust;
compDecL = (compDecL*(1.0-iirDecFreq))+(dubly*iirDecFreq);
inputSampleL += ((highPart*compDecL)*outlyAmount);
} //end Dubly decode L
iirDecR = (iirDecR * (1.0 - iirDecFreq)) + (inputSampleR * iirDecFreq);
highPart = ((inputSampleR-iirDecR)*2.628);
highPart += avgDecR; avgDecR = (inputSampleR-iirDecR)*1.372;
if (highPart > 1.0) highPart = 1.0; if (highPart < -1.0) highPart = -1.0;
dubly = fabs(highPart);
if (dubly > 0.0) {
double adjust = log(1.0+(255.0*dubly))/2.40823996531;
if (adjust > 0.0) dubly /= adjust;
compDecR = (compDecR*(1.0-iirDecFreq))+(dubly*iirDecFreq);
inputSampleR += ((highPart*compDecR)*outlyAmount);
} //end Dubly decode R
if (outputGain != 1.0) {
inputSampleL *= outputGain;
inputSampleR *= outputGain;
}
//begin ClipOnly3 as a little, compressed chunk that can be dropped into code
double noise = 1.0-((double(fpdL)/UINT32_MAX)*0.076);
if (wasPosClipL == true) { //current will be over
if (inputSampleL<lastSampleL) lastSampleL=(0.9085097*noise)+(inputSampleL*(1.0-noise));
else lastSampleL = 0.94; //~-0.2dB to nearly match ClipOnly and ClipOnly2
} wasPosClipL = false;
if (inputSampleL>0.9085097) {wasPosClipL=true;inputSampleL=(0.9085097*noise)+(lastSampleL*(1.0-noise));}
if (wasNegClipL == true) { //current will be -over
if (inputSampleL > lastSampleL) lastSampleL=(-0.9085097*noise)+(inputSampleL*(1.0-noise));
else lastSampleL = -0.94;
} wasNegClipL = false;
if (inputSampleL<-0.9085097) {wasNegClipL=true;inputSampleL=(-0.9085097*noise)+(lastSampleL*(1.0-noise));}
slewL[spacing*2] = fabs(lastSampleL-inputSampleL);
for (int x = spacing*2; x > 0; x--) slewL[x-1] = slewL[x];
intermediateL[spacing] = inputSampleL; inputSampleL = lastSampleL;
//latency is however many samples equals one 44.1k sample
for (int x = spacing; x > 0; x--) {intermediateL[x-1] = intermediateL[x];} lastSampleL = intermediateL[0];
if (wasPosClipL || wasNegClipL) {
for (int x = spacing; x > 0; x--) lastSampleL += intermediateL[x];
lastSampleL /= spacing;
} double finalSlew = 0.0;
for (int x = spacing*2; x >= 0; x--) if (finalSlew < slewL[x]) finalSlew = slewL[x];
double postclip = 0.94 / (1.0+(finalSlew*1.3986013));
if (inputSampleL > postclip) inputSampleL = postclip; if (inputSampleL < -postclip) inputSampleL = -postclip;
noise = 1.0-((double(fpdR)/UINT32_MAX)*0.076);
if (wasPosClipR == true) { //current will be over
if (inputSampleR<lastSampleR) lastSampleR=(0.9085097*noise)+(inputSampleR*(1.0-noise));
else lastSampleR = 0.94; //~-0.2dB to nearly match ClipOnly and ClipOnly2
} wasPosClipR = false;
if (inputSampleR>0.9085097) {wasPosClipR=true;inputSampleR=(0.9085097*noise)+(lastSampleR*(1.0-noise));}
if (wasNegClipR == true) { //current will be -over
if (inputSampleR > lastSampleR) lastSampleR=(-0.9085097*noise)+(inputSampleR*(1.0-noise));
else lastSampleR = -0.94;
} wasNegClipR = false;
if (inputSampleR<-0.9085097) {wasNegClipR=true;inputSampleR=(-0.9085097*noise)+(lastSampleR*(1.0-noise));}
slewR[spacing*2] = fabs(lastSampleR-inputSampleR);
for (int x = spacing*2; x > 0; x--) slewR[x-1] = slewR[x];
intermediateR[spacing] = inputSampleR; inputSampleR = lastSampleR;
//latency is however many samples equals one 44.1k sample
for (int x = spacing; x > 0; x--) {intermediateR[x-1] = intermediateR[x];} lastSampleR = intermediateR[0];
if (wasPosClipR || wasNegClipR) {
for (int x = spacing; x > 0; x--) lastSampleR += intermediateR[x];
lastSampleR /= spacing;
} finalSlew = 0.0;
for (int x = spacing*2; x >= 0; x--) if (finalSlew < slewR[x]) finalSlew = slewR[x];
postclip = 0.94 / (1.0+(finalSlew*1.3986013));
if (inputSampleR > postclip) inputSampleR = postclip; if (inputSampleR < -postclip) inputSampleR = -postclip;
//end ClipOnly3 as a little, compressed chunk that can be dropped into code
//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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