mirror of
https://github.com/airwindows/airwindows.git
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196 lines
6.9 KiB
C++
Executable file
196 lines
6.9 KiB
C++
Executable file
/* ========================================
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* Pear - Pear.h
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* Copyright (c) airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __Pear_H
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#include "Pear.h"
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#endif
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void Pear::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 > 3) cycleEnd = 3;
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cycleEnd--; //this is going to be 0 for 44.1 or 48k, 1 for 88.2 or 96k, 2 for 176 or 192k.
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//DIFFERENT! Offsetting the bt shift
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int bitshiftFreq = (10-(A*10.0))+cycleEnd;
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double freq = 1.0;
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switch (bitshiftFreq)
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{
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case 16: freq = 0.0000152587890625; break;
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case 15: freq = 0.000030517578125; break;
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case 14: freq = 0.00006103515625; break;
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case 13: freq = 0.0001220703125; break;
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case 12: freq = 0.000244140625; break;
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case 11: freq = 0.00048828125; break;
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case 10: freq = 0.0009765625; break;
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case 9: freq = 0.001953125; break;
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case 8: freq = 0.00390625; break;
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case 7: freq = 0.0078125; break;
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case 6: freq = 0.015625; break;
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case 5: freq = 0.03125; break;
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case 4: freq = 0.0625; break;
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case 3: freq = 0.125; break;
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case 2: freq = 0.25; break;
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case 1: freq = 0.5; break;
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case 0: freq = 1.0; break;
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}
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double maxPoles = B*pear_total;
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double wet = (C*2.0)-1.0; //inv-dry-wet for highpass
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double dry = 2.0-(C*2.0);
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if (dry > 1.0) dry = 1.0; //full dry for use with inv, to 0.0 at full wet
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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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//Pear is a variation on a Holt filter, made to act like my biquad filters:
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//its variables (L and R prevSample and prevSlew) contained in arrays for easier handling.
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//On top of that, the array is used to facilitate use of the filter in a stack which will
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//sharpen its very weak frequency response performance (3dB/oct per pole) and allow it to run
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//in a loop. Many earlier Airwindows filters did this 'unrolled', often with variables given
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//lettered suffixes like iirA through iirZ. The use of an array will make this a lot tidier.
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for (int x = 0; x < maxPoles; x += 4) {
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double slew = ((inputSampleL - pear[x]) + pear[x+1])*freq*0.5;
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pear[x] = inputSampleL = (freq * inputSampleL) + ((1.0-freq) * (pear[x] + pear[x+1]));
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pear[x+1] = slew;
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slew = ((inputSampleR - pear[x+2]) + pear[x+3])*freq*0.5;
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pear[x+2] = inputSampleR = (freq * inputSampleR) + ((1.0-freq) * (pear[x+2] + pear[x+3]));
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pear[x+3] = slew;
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}
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inputSampleL *= wet;
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inputSampleR *= wet;
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drySampleL *= dry;
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drySampleR *= dry;
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inputSampleL += drySampleL;
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inputSampleR += 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 Pear::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 > 3) cycleEnd = 3;
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cycleEnd--; //this is going to be 0 for 44.1 or 48k, 1 for 88.2 or 96k, 2 for 176 or 192k.
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//DIFFERENT! Offsetting the bt shift
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int bitshiftFreq = (10-(A*10.0))+cycleEnd;
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double freq = 1.0;
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switch (bitshiftFreq)
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{
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case 16: freq = 0.0000152587890625; break;
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case 15: freq = 0.000030517578125; break;
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case 14: freq = 0.00006103515625; break;
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case 13: freq = 0.0001220703125; break;
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case 12: freq = 0.000244140625; break;
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case 11: freq = 0.00048828125; break;
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case 10: freq = 0.0009765625; break;
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case 9: freq = 0.001953125; break;
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case 8: freq = 0.00390625; break;
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case 7: freq = 0.0078125; break;
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case 6: freq = 0.015625; break;
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case 5: freq = 0.03125; break;
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case 4: freq = 0.0625; break;
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case 3: freq = 0.125; break;
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case 2: freq = 0.25; break;
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case 1: freq = 0.5; break;
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case 0: freq = 1.0; break;
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}
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double maxPoles = B*pear_total;
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double wet = (C*2.0)-1.0; //inv-dry-wet for highpass
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double dry = 2.0-(C*2.0);
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if (dry > 1.0) dry = 1.0; //full dry for use with inv, to 0.0 at full wet
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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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//Pear is a variation on a Holt filter, made to act like my biquad filters:
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//its variables (L and R prevSample and prevSlew) contained in arrays for easier handling.
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//On top of that, the array is used to facilitate use of the filter in a stack which will
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//sharpen its very weak frequency response performance (3dB/oct per pole) and allow it to run
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//in a loop. Many earlier Airwindows filters did this 'unrolled', often with variables given
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//lettered suffixes like iirA through iirZ. The use of an array will make this a lot tidier.
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for (int x = 0; x < maxPoles; x += 4) {
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double slew = ((inputSampleL - pear[x]) + pear[x+1])*freq*0.5;
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pear[x] = inputSampleL = (freq * inputSampleL) + ((1.0-freq) * (pear[x] + pear[x+1]));
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pear[x+1] = slew;
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slew = ((inputSampleR - pear[x+2]) + pear[x+3])*freq*0.5;
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pear[x+2] = inputSampleR = (freq * inputSampleR) + ((1.0-freq) * (pear[x+2] + pear[x+3]));
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pear[x+3] = slew;
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}
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inputSampleL *= wet;
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inputSampleR *= wet;
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drySampleL *= dry;
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drySampleR *= dry;
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inputSampleL += drySampleL;
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inputSampleR += 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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