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210 lines
9.4 KiB
C++
Executable file
210 lines
9.4 KiB
C++
Executable file
/* ========================================
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* Elliptical - Elliptical.h
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* Copyright (c) airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __Elliptical_H
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#include "Elliptical.h"
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#endif
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void Elliptical::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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double rangescale = 0.1 / overallscale;
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double cutoff = pow(A,3);
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double slope = pow(B,3) * 6.0;
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double newA = cutoff * rangescale;
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double newB = newA; //other part of interleaved IIR is the same
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double fpOld = 0.618033988749894848204586; //golden ratio!
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double newC = cutoff * rangescale; //first extra pole is the same
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cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
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double newD = cutoff * rangescale;
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cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
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double newE = cutoff * rangescale;
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cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
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double newF = cutoff * rangescale;
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cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
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double newG = cutoff * rangescale;
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cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
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double newH = cutoff * rangescale;
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//converge toward the unvarying fixed cutoff value
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double polesC = slope; if (slope > 1.0) polesC = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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double polesD = slope; if (slope > 1.0) polesD = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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double polesE = slope; if (slope > 1.0) polesE = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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double polesF = slope; if (slope > 1.0) polesF = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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double polesG = slope; if (slope > 1.0) polesG = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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double polesH = slope; if (slope > 1.0) polesH = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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//each one will either be 0.0, the fractional slope value, or 1
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while (--sampleFrames >= 0)
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{
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double inputSampleL = *in1;
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double inputSampleR = *in2;
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if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
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if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
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double mid = inputSampleL + inputSampleR;
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double side = inputSampleL - inputSampleR;
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//assign mid and side.Between these sections, you can do mid/side processing
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double temp = side;
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double correction;
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if (fpFlip) {
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iirA = (iirA * (1.0 - newA)) + (temp * newA); temp -= iirA; correction = iirA;
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} else {
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iirB = (iirB * (1.0 - newB)) + (temp * newB); temp -= iirB; correction = iirB;
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}
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iirC = (iirC * (1.0 - newC)) + (temp * newC); temp -= iirC;
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iirD = (iirD * (1.0 - newD)) + (temp * newD); temp -= iirD;
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iirE = (iirE * (1.0 - newE)) + (temp * newE); temp -= iirE;
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iirF = (iirF * (1.0 - newF)) + (temp * newF); temp -= iirF;
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iirG = (iirG * (1.0 - newG)) + (temp * newG); temp -= iirG;
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iirH = (iirH * (1.0 - newH)) + (temp * newH); temp -= iirH;
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//set up all the iir filters in case they are used
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if (polesC == 1.0) correction += iirC; if (polesC > 0.0 && polesC < 1.0) correction += (iirC * polesC);
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if (polesD == 1.0) correction += iirD; if (polesD > 0.0 && polesD < 1.0) correction += (iirD * polesD);
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if (polesE == 1.0) correction += iirE; if (polesE > 0.0 && polesE < 1.0) correction += (iirE * polesE);
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if (polesF == 1.0) correction += iirF; if (polesF > 0.0 && polesF < 1.0) correction += (iirF * polesF);
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if (polesG == 1.0) correction += iirG; if (polesG > 0.0 && polesG < 1.0) correction += (iirG * polesG);
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if (polesH == 1.0) correction += iirH; if (polesH > 0.0 && polesH < 1.0) correction += (iirH * polesH);
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//each of these are added directly if they're fully engaged,
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//multiplied by 0-1 if they are the interpolated one, or skipped if they are beyond the interpolated one.
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//the purpose is to do all the math at the floating point exponent nearest to the tiny value in use.
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//also, it's formatted that way to easily substitute the next variable: this could be written as a loop
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//with everything an array value. However, this makes just as much sense for this few poles.
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side -= correction;
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fpFlip = !fpFlip;
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inputSampleL = (mid+side)/2.0;
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inputSampleR = (mid-side)/2.0;
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//unassign mid and side
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//begin 32 bit stereo floating point dither
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int expon; frexpf((float)inputSampleL, &expon);
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
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frexpf((float)inputSampleR, &expon);
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
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//end 32 bit stereo floating point dither
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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 Elliptical::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 rangescale = 0.1 / overallscale;
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double cutoff = pow(A,3);
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double slope = pow(B,3) * 6.0;
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double newA = cutoff * rangescale;
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double newB = newA; //other part of interleaved IIR is the same
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double fpOld = 0.618033988749894848204586; //golden ratio!
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double newC = cutoff * rangescale; //first extra pole is the same
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cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
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double newD = cutoff * rangescale;
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cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
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double newE = cutoff * rangescale;
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cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
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double newF = cutoff * rangescale;
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cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
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double newG = cutoff * rangescale;
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cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
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double newH = cutoff * rangescale;
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//converge toward the unvarying fixed cutoff value
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double polesC = slope; if (slope > 1.0) polesC = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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double polesD = slope; if (slope > 1.0) polesD = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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double polesE = slope; if (slope > 1.0) polesE = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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double polesF = slope; if (slope > 1.0) polesF = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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double polesG = slope; if (slope > 1.0) polesG = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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double polesH = slope; if (slope > 1.0) polesH = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
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//each one will either be 0.0, the fractional slope value, or 1
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while (--sampleFrames >= 0)
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{
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double inputSampleL = *in1;
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double inputSampleR = *in2;
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if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
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if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
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double mid = inputSampleL + inputSampleR;
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double side = inputSampleL - inputSampleR;
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//assign mid and side.Between these sections, you can do mid/side processing
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double temp = side;
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double correction;
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if (fpFlip) {
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iirA = (iirA * (1.0 - newA)) + (temp * newA); temp -= iirA; correction = iirA;
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} else {
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iirB = (iirB * (1.0 - newB)) + (temp * newB); temp -= iirB; correction = iirB;
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}
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iirC = (iirC * (1.0 - newC)) + (temp * newC); temp -= iirC;
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iirD = (iirD * (1.0 - newD)) + (temp * newD); temp -= iirD;
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iirE = (iirE * (1.0 - newE)) + (temp * newE); temp -= iirE;
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iirF = (iirF * (1.0 - newF)) + (temp * newF); temp -= iirF;
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iirG = (iirG * (1.0 - newG)) + (temp * newG); temp -= iirG;
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iirH = (iirH * (1.0 - newH)) + (temp * newH); temp -= iirH;
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//set up all the iir filters in case they are used
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if (polesC == 1.0) correction += iirC; if (polesC > 0.0 && polesC < 1.0) correction += (iirC * polesC);
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if (polesD == 1.0) correction += iirD; if (polesD > 0.0 && polesD < 1.0) correction += (iirD * polesD);
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if (polesE == 1.0) correction += iirE; if (polesE > 0.0 && polesE < 1.0) correction += (iirE * polesE);
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if (polesF == 1.0) correction += iirF; if (polesF > 0.0 && polesF < 1.0) correction += (iirF * polesF);
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if (polesG == 1.0) correction += iirG; if (polesG > 0.0 && polesG < 1.0) correction += (iirG * polesG);
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if (polesH == 1.0) correction += iirH; if (polesH > 0.0 && polesH < 1.0) correction += (iirH * polesH);
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//each of these are added directly if they're fully engaged,
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//multiplied by 0-1 if they are the interpolated one, or skipped if they are beyond the interpolated one.
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//the purpose is to do all the math at the floating point exponent nearest to the tiny value in use.
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//also, it's formatted that way to easily substitute the next variable: this could be written as a loop
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//with everything an array value. However, this makes just as much sense for this few poles.
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side -= correction;
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fpFlip = !fpFlip;
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inputSampleL = (mid+side)/2.0;
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inputSampleR = (mid-side)/2.0;
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//unassign mid and side
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//begin 64 bit stereo floating point dither
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//int expon; frexp((double)inputSampleL, &expon);
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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//inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
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//frexp((double)inputSampleR, &expon);
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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//inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
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//end 64 bit stereo floating point dither
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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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