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https://github.com/airwindows/airwindows.git
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238 lines
8.7 KiB
C++
Executable file
238 lines
8.7 KiB
C++
Executable file
/* ========================================
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* DeBez - DeBez.h
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* Copyright (c) airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __DeBez_H
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#include "DeBez.h"
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#endif
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void DeBez::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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VstInt32 inFramesToProcess = sampleFrames; //vst doesn't give us this as a separate variable so we'll make it
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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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rezA = rezB; rezB = A*2.0;
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bitA = bitB; bitB = B*2.0;
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wetA = wetB; wetB = C*2.0;
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bool steppedFreq = true; // Revised Bezier Undersampling
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if (rezB > 1.0) { // has full rez at center, stepped
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steppedFreq = false; // to left, continuous to right
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rezB = 1.0-(rezB-1.0);
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} //if it's set up like that it's the revised algorithm
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rezB = fmin(fmax(pow(rezB,3.0),0.0005),1.0); //note: no overallscale, already inside undersampling
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int bezFreqFraction = (int)(1.0/rezB);
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double bezFreqTrim = (double)bezFreqFraction/(bezFreqFraction+1.0);
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if (steppedFreq) { //this hard-locks derez to exact subdivisions of 1.0
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rezB = 1.0 / bezFreqFraction;
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bezFreqTrim = 1.0-(rezB*bezFreqTrim);
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} else { //this makes it match the 1.0 case using stepped
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bezFreqTrim = 1.0-pow(rezB*0.5,1.0/(rezB*0.5));
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} //the revision more accurately connects the bezier curves
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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 drySampleL = inputSampleL;
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double drySampleR = inputSampleR;
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double temp = (double)sampleFrames/inFramesToProcess;
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double rez = (rezA*temp)+(rezB*(1.0-temp));
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double bit = ((bitA*temp)+(bitB*(1.0-temp)))-1.0;
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double wet = ((wetA*temp)+(wetB*(1.0-temp)))-1.0;
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double dry = 1.0 - wet;
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if (wet > 1.0) wet = 1.0;
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if (wet < -1.0) wet = -1.0;
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if (dry > 1.0) dry = 1.0;
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if (dry < 0.0) dry = 0.0;
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//this bitcrush can be subtracted.
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bezF[bez_cycle] += rez;
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bezF[bez_SampL] += (inputSampleL * rez);
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bezF[bez_SampR] += (inputSampleR * rez);
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if (bezF[bez_cycle] > 1.0) {
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if (steppedFreq) bezF[bez_cycle] = 0.0;
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else bezF[bez_cycle] -= 1.0;
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inputSampleL = (bezF[bez_SampL]+bezF[bez_AvgInSampL])*0.5;
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bezF[bez_AvgInSampL] = bezF[bez_SampL];
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inputSampleR = (bezF[bez_SampR]+bezF[bez_AvgInSampR])*0.5;
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bezF[bez_AvgInSampR] = bezF[bez_SampR];
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bool crushGate = (bit < 0.0);
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bit = 1.0-fabs(bit);
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bit = fmin(fmax(bit*16.0,0.5),16.0);
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double bitFactor = pow(2.0,bit);
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inputSampleL *= bitFactor;
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inputSampleL = floor(inputSampleL+(crushGate?0.5/bitFactor:0.0));
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inputSampleL /= bitFactor;
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inputSampleR *= bitFactor;
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inputSampleR = floor(inputSampleR+(crushGate?0.5/bitFactor:0.0));
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inputSampleR /= bitFactor;
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//derez inside debez
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bezF[bez_CL] = bezF[bez_BL];
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bezF[bez_BL] = bezF[bez_AL];
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bezF[bez_AL] = inputSampleL;
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bezF[bez_SampL] = 0.0;
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bezF[bez_CR] = bezF[bez_BR];
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bezF[bez_BR] = bezF[bez_AR];
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bezF[bez_AR] = inputSampleR;
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bezF[bez_SampR] = 0.0;
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}
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double X = bezF[bez_cycle]*bezFreqTrim;
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double CBLfreq = (bezF[bez_CL]*(1.0-X))+(bezF[bez_BL]*X);
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double BALfreq = (bezF[bez_BL]*(1.0-X))+(bezF[bez_AL]*X);
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double CBALfreq = (bezF[bez_BL]+(CBLfreq*(1.0-X))+(BALfreq*X))*0.125;
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inputSampleL = CBALfreq+bezF[bez_AvgOutSampL]; bezF[bez_AvgOutSampL] = CBALfreq;
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double CBRfreq = (bezF[bez_CR]*(1.0-X))+(bezF[bez_BR]*X);
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double BARfreq = (bezF[bez_BR]*(1.0-X))+(bezF[bez_AR]*X);
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double CBARfreq = (bezF[bez_BR]+(CBRfreq*(1.0-X))+(BARfreq*X))*0.125;
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inputSampleR = CBARfreq+bezF[bez_AvgOutSampR]; bezF[bez_AvgOutSampR] = CBARfreq;
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inputSampleL = (wet*inputSampleL)+(dry*drySampleL);
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inputSampleR = (wet*inputSampleR)+(dry*drySampleR);
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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 DeBez::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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VstInt32 inFramesToProcess = sampleFrames; //vst doesn't give us this as a separate variable so we'll make it
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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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rezA = rezB; rezB = A*2.0;
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bitA = bitB; bitB = B*2.0;
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wetA = wetB; wetB = C*2.0;
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bool steppedFreq = true; // Revised Bezier Undersampling
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if (rezB > 1.0) { // has full rez at center, stepped
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steppedFreq = false; // to left, continuous to right
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rezB = 1.0-(rezB-1.0);
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} //if it's set up like that it's the revised algorithm
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rezB = fmin(fmax(pow(rezB,3.0),0.0005),1.0); //note: no overallscale, already inside undersampling
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int bezFreqFraction = (int)(1.0/rezB);
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double bezFreqTrim = (double)bezFreqFraction/(bezFreqFraction+1.0);
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if (steppedFreq) { //this hard-locks derez to exact subdivisions of 1.0
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rezB = 1.0 / bezFreqFraction;
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bezFreqTrim = 1.0-(rezB*bezFreqTrim);
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} else { //this makes it match the 1.0 case using stepped
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bezFreqTrim = 1.0-pow(rezB*0.5,1.0/(rezB*0.5));
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} //the revision more accurately connects the bezier curves
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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 drySampleL = inputSampleL;
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double drySampleR = inputSampleR;
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double temp = (double)sampleFrames/inFramesToProcess;
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double rez = (rezA*temp)+(rezB*(1.0-temp));
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double bit = ((bitA*temp)+(bitB*(1.0-temp)))-1.0;
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double wet = ((wetA*temp)+(wetB*(1.0-temp)))-1.0;
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double dry = 1.0 - wet;
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if (wet > 1.0) wet = 1.0;
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if (wet < -1.0) wet = -1.0;
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if (dry > 1.0) dry = 1.0;
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if (dry < 0.0) dry = 0.0;
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//this bitcrush can be subtracted.
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bezF[bez_cycle] += rez;
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bezF[bez_SampL] += (inputSampleL * rez);
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bezF[bez_SampR] += (inputSampleR * rez);
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if (bezF[bez_cycle] > 1.0) {
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if (steppedFreq) bezF[bez_cycle] = 0.0;
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else bezF[bez_cycle] -= 1.0;
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inputSampleL = (bezF[bez_SampL]+bezF[bez_AvgInSampL])*0.5;
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bezF[bez_AvgInSampL] = bezF[bez_SampL];
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inputSampleR = (bezF[bez_SampR]+bezF[bez_AvgInSampR])*0.5;
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bezF[bez_AvgInSampR] = bezF[bez_SampR];
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bool crushGate = (bit < 0.0);
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bit = 1.0-fabs(bit);
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bit = fmin(fmax(bit*16.0,0.5),16.0);
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double bitFactor = pow(2.0,bit);
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inputSampleL *= bitFactor;
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inputSampleL = floor(inputSampleL+(crushGate?0.5/bitFactor:0.0));
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inputSampleL /= bitFactor;
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inputSampleR *= bitFactor;
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inputSampleR = floor(inputSampleR+(crushGate?0.5/bitFactor:0.0));
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inputSampleR /= bitFactor;
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//derez inside debez
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bezF[bez_CL] = bezF[bez_BL];
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bezF[bez_BL] = bezF[bez_AL];
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bezF[bez_AL] = inputSampleL;
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bezF[bez_SampL] = 0.0;
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bezF[bez_CR] = bezF[bez_BR];
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bezF[bez_BR] = bezF[bez_AR];
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bezF[bez_AR] = inputSampleR;
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bezF[bez_SampR] = 0.0;
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}
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double X = bezF[bez_cycle]*bezFreqTrim;
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double CBLfreq = (bezF[bez_CL]*(1.0-X))+(bezF[bez_BL]*X);
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double BALfreq = (bezF[bez_BL]*(1.0-X))+(bezF[bez_AL]*X);
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double CBALfreq = (bezF[bez_BL]+(CBLfreq*(1.0-X))+(BALfreq*X))*0.125;
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inputSampleL = CBALfreq+bezF[bez_AvgOutSampL]; bezF[bez_AvgOutSampL] = CBALfreq;
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double CBRfreq = (bezF[bez_CR]*(1.0-X))+(bezF[bez_BR]*X);
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double BARfreq = (bezF[bez_BR]*(1.0-X))+(bezF[bez_AR]*X);
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double CBARfreq = (bezF[bez_BR]+(CBRfreq*(1.0-X))+(BARfreq*X))*0.125;
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inputSampleR = CBARfreq+bezF[bez_AvgOutSampR]; bezF[bez_AvgOutSampR] = CBARfreq;
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inputSampleL = (wet*inputSampleL)+(dry*drySampleL);
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inputSampleR = (wet*inputSampleR)+(dry*drySampleR);
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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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