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300 lines
12 KiB
C++
Executable file
300 lines
12 KiB
C++
Executable file
/* ========================================
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* StereoChorus - StereoChorus.h
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* Copyright (c) 2016 airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __StereoChorus_H
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#include "StereoChorus.h"
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#endif
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void StereoChorus::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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int cycleEnd = floor(overallscale);
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if (cycleEnd < 1) cycleEnd = 1;
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if (cycleEnd > 4) cycleEnd = 4;
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//this is going to be 2 for 88.1 or 96k, 3 for silly people, 4 for 176 or 192k
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if (cycle > cycleEnd-1) cycle = cycleEnd-1; //sanity check
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double speed = pow(0.32+(A/6),10);
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double depth = (B/60) / speed;
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double tupi = 3.141592653589793238 * 2.0;
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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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cycle++;
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if (cycle == cycleEnd) { //hit the end point and we do a chorus sample
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//assign working variables
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airFactorL = airPrevL - inputSampleL;
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if (flip) {airEvenL += airFactorL; airOddL -= airFactorL; airFactorL = airEvenL;}
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else {airOddL += airFactorL; airEvenL -= airFactorL; airFactorL = airOddL;}
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airOddL = (airOddL - ((airOddL - airEvenL)/256.0)) / 1.0001;
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airEvenL = (airEvenL - ((airEvenL - airOddL)/256.0)) / 1.0001;
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airPrevL = inputSampleL;
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inputSampleL += airFactorL;
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//left
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airFactorR = airPrevR - inputSampleR;
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if (flip) {airEvenR += airFactorR; airOddR -= airFactorR; airFactorR = airEvenR;}
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else {airOddR += airFactorR; airEvenR -= airFactorR; airFactorR = airOddR;}
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airOddR = (airOddR - ((airOddR - airEvenR)/256.0)) / 1.0001;
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airEvenR = (airEvenR - ((airEvenR - airOddR)/256.0)) / 1.0001;
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airPrevR = inputSampleR;
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inputSampleR += airFactorR;
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//right
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flip = !flip;
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//air, compensates for loss of highs in flanger's interpolation
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int tempL = 0;
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int tempR = 0;
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if (gcount < 1 || gcount > 32760) {gcount = 32760;}
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int count = gcount;
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pL[count+32760] = pL[count] = (int)(inputSampleL*8388352.0);
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//double buffer -8388352 to 8388352 is equal to 24 bit linear space
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double offset = depth + (depth * sin(sweepL));
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count += (int)floor(offset);
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tempL += (int)(pL[count] * (1-(offset-floor(offset)))); //less as value moves away from .0
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tempL += pL[count+1]; //we can assume always using this in one way or another?
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tempL += (int)(pL[count+2] * (offset-floor(offset))); //greater as value moves away from .0
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tempL -= (int)(((pL[count]-pL[count+1])-(pL[count+1]-pL[count+2]))/50); //interpolation hacks 'r us
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//left
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count = gcount;
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pR[count+32760] = pR[count] = (int)(inputSampleR*8388352.0);
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//double buffer -8388352 to 8388352 is equal to 24 bit linear space
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offset = depth + (depth * sin(sweepR));
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count += (int)floor(offset);
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tempR += (int)(pR[count] * (1-(offset-floor(offset)))); //less as value moves away from .0
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tempR += pR[count+1]; //we can assume always using this in one way or another?
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tempR += (int)(pR[count+2] * (offset-floor(offset))); //greater as value moves away from .0
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tempR -= (int)(((pR[count]-pR[count+1])-(pR[count+1]-pR[count+2]))/50); //interpolation hacks 'r us
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//right
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sweepL += speed;
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sweepR += speed;
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if (sweepL > tupi){sweepL -= tupi;}
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if (sweepR > tupi){sweepR -= tupi;}
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gcount--;
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//still scrolling through the samples, remember
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inputSampleL = ((double)(tempL/16776704.0));
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inputSampleR = ((double)(tempR/16776704.0));
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if (cycleEnd == 4) {
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lastRefL[0] = lastRefL[4]; //start from previous last
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lastRefL[2] = (lastRefL[0] + inputSampleL)/2; //half
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lastRefL[1] = (lastRefL[0] + lastRefL[2])/2; //one quarter
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lastRefL[3] = (lastRefL[2] + inputSampleL)/2; //three quarters
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lastRefL[4] = inputSampleL; //full
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lastRefR[0] = lastRefR[4]; //start from previous last
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lastRefR[2] = (lastRefR[0] + inputSampleR)/2; //half
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lastRefR[1] = (lastRefR[0] + lastRefR[2])/2; //one quarter
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lastRefR[3] = (lastRefR[2] + inputSampleR)/2; //three quarters
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lastRefR[4] = inputSampleR; //full
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}
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if (cycleEnd == 3) {
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lastRefL[0] = lastRefL[3]; //start from previous last
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lastRefL[2] = (lastRefL[0]+lastRefL[0]+inputSampleL)/3; //third
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lastRefL[1] = (lastRefL[0]+inputSampleL+inputSampleL)/3; //two thirds
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lastRefL[3] = inputSampleL; //full
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lastRefR[0] = lastRefR[3]; //start from previous last
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lastRefR[2] = (lastRefR[0]+lastRefR[0]+inputSampleR)/3; //third
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lastRefR[1] = (lastRefR[0]+inputSampleR+inputSampleR)/3; //two thirds
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lastRefR[3] = inputSampleR; //full
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}
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if (cycleEnd == 2) {
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lastRefL[0] = lastRefL[2]; //start from previous last
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lastRefL[1] = (lastRefL[0] + inputSampleL)/2; //half
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lastRefL[2] = inputSampleL; //full
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lastRefR[0] = lastRefR[2]; //start from previous last
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lastRefR[1] = (lastRefR[0] + inputSampleR)/2; //half
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lastRefR[2] = inputSampleR; //full
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}
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if (cycleEnd == 1) {
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lastRefL[0] = inputSampleL;
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lastRefR[0] = inputSampleR;
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}
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cycle = 0; //reset
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inputSampleL = lastRefL[cycle];
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inputSampleR = lastRefR[cycle];
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} else {
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inputSampleL = lastRefL[cycle];
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inputSampleR = lastRefR[cycle];
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//we are going through our references now
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}
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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 StereoChorus::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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int cycleEnd = floor(overallscale);
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if (cycleEnd < 1) cycleEnd = 1;
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if (cycleEnd > 4) cycleEnd = 4;
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//this is going to be 2 for 88.1 or 96k, 3 for silly people, 4 for 176 or 192k
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if (cycle > cycleEnd-1) cycle = cycleEnd-1; //sanity check
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double speed = pow(0.32+(A/6),10);
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double depth = (B/60) / speed;
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double tupi = 3.141592653589793238 * 2.0;
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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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cycle++;
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if (cycle == cycleEnd) { //hit the end point and we do a chorus sample
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//assign working variables
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airFactorL = airPrevL - inputSampleL;
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if (flip) {airEvenL += airFactorL; airOddL -= airFactorL; airFactorL = airEvenL;}
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else {airOddL += airFactorL; airEvenL -= airFactorL; airFactorL = airOddL;}
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airOddL = (airOddL - ((airOddL - airEvenL)/256.0)) / 1.0001;
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airEvenL = (airEvenL - ((airEvenL - airOddL)/256.0)) / 1.0001;
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airPrevL = inputSampleL;
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inputSampleL += airFactorL;
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//left
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airFactorR = airPrevR - inputSampleR;
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if (flip) {airEvenR += airFactorR; airOddR -= airFactorR; airFactorR = airEvenR;}
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else {airOddR += airFactorR; airEvenR -= airFactorR; airFactorR = airOddR;}
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airOddR = (airOddR - ((airOddR - airEvenR)/256.0)) / 1.0001;
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airEvenR = (airEvenR - ((airEvenR - airOddR)/256.0)) / 1.0001;
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airPrevR = inputSampleR;
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inputSampleR += airFactorR;
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//right
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flip = !flip;
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//air, compensates for loss of highs in flanger's interpolation
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int tempL = 0;
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int tempR = 0;
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if (gcount < 1 || gcount > 32760) {gcount = 32760;}
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int count = gcount;
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pL[count+32760] = pL[count] = (int)(inputSampleL*8388352.0);
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//double buffer -8388352 to 8388352 is equal to 24 bit linear space
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double offset = depth + (depth * sin(sweepL));
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count += (int)floor(offset);
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tempL += (int)(pL[count] * (1-(offset-floor(offset)))); //less as value moves away from .0
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tempL += pL[count+1]; //we can assume always using this in one way or another?
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tempL += (int)(pL[count+2] * (offset-floor(offset))); //greater as value moves away from .0
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tempL -= (int)(((pL[count]-pL[count+1])-(pL[count+1]-pL[count+2]))/50); //interpolation hacks 'r us
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//left
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count = gcount;
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pR[count+32760] = pR[count] = (int)(inputSampleR*8388352.0);
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//double buffer -8388352 to 8388352 is equal to 24 bit linear space
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offset = depth + (depth * sin(sweepR));
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count += (int)floor(offset);
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tempR += (int)(pR[count] * (1-(offset-floor(offset)))); //less as value moves away from .0
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tempR += pR[count+1]; //we can assume always using this in one way or another?
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tempR += (int)(pR[count+2] * (offset-floor(offset))); //greater as value moves away from .0
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tempR -= (int)(((pR[count]-pR[count+1])-(pR[count+1]-pR[count+2]))/50); //interpolation hacks 'r us
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//right
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sweepL += speed;
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sweepR += speed;
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if (sweepL > tupi){sweepL -= tupi;}
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if (sweepR > tupi){sweepR -= tupi;}
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gcount--;
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//still scrolling through the samples, remember
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inputSampleL = ((double)(tempL/16776704.0));
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inputSampleR = ((double)(tempR/16776704.0));
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if (cycleEnd == 4) {
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lastRefL[0] = lastRefL[4]; //start from previous last
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lastRefL[2] = (lastRefL[0] + inputSampleL)/2; //half
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lastRefL[1] = (lastRefL[0] + lastRefL[2])/2; //one quarter
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lastRefL[3] = (lastRefL[2] + inputSampleL)/2; //three quarters
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lastRefL[4] = inputSampleL; //full
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lastRefR[0] = lastRefR[4]; //start from previous last
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lastRefR[2] = (lastRefR[0] + inputSampleR)/2; //half
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lastRefR[1] = (lastRefR[0] + lastRefR[2])/2; //one quarter
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lastRefR[3] = (lastRefR[2] + inputSampleR)/2; //three quarters
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lastRefR[4] = inputSampleR; //full
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}
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if (cycleEnd == 3) {
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lastRefL[0] = lastRefL[3]; //start from previous last
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lastRefL[2] = (lastRefL[0]+lastRefL[0]+inputSampleL)/3; //third
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lastRefL[1] = (lastRefL[0]+inputSampleL+inputSampleL)/3; //two thirds
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lastRefL[3] = inputSampleL; //full
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lastRefR[0] = lastRefR[3]; //start from previous last
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lastRefR[2] = (lastRefR[0]+lastRefR[0]+inputSampleR)/3; //third
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lastRefR[1] = (lastRefR[0]+inputSampleR+inputSampleR)/3; //two thirds
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lastRefR[3] = inputSampleR; //full
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}
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if (cycleEnd == 2) {
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lastRefL[0] = lastRefL[2]; //start from previous last
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lastRefL[1] = (lastRefL[0] + inputSampleL)/2; //half
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lastRefL[2] = inputSampleL; //full
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lastRefR[0] = lastRefR[2]; //start from previous last
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lastRefR[1] = (lastRefR[0] + inputSampleR)/2; //half
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lastRefR[2] = inputSampleR; //full
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}
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if (cycleEnd == 1) {
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lastRefL[0] = inputSampleL;
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lastRefR[0] = inputSampleR;
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}
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cycle = 0; //reset
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inputSampleL = lastRefL[cycle];
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inputSampleR = lastRefR[cycle];
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} else {
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inputSampleL = lastRefL[cycle];
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inputSampleR = lastRefR[cycle];
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//we are going through our references now
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}
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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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