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176 lines
7.4 KiB
C++
Executable file
176 lines
7.4 KiB
C++
Executable file
/* ========================================
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* Coils - Coils.h
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* Copyright (c) 2016 airwindows, All rights reserved
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* ======================================== */
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#ifndef __Coils_H
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#include "Coils.h"
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#endif
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void Coils::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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//[0] is frequency: 0.000001 to 0.499999 is near-zero to near-Nyquist
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//[1] is resonance, 0.7071 is Butterworth. Also can't be zero
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double boost = 1.0-pow(A,2);
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if (boost < 0.001) boost = 0.001; //there's a divide, we can't have this be zero
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figureL[0] = figureR[0] = 600.0/getSampleRate(); //fixed frequency, 600hz
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figureL[1] = figureR[1] = 0.023; //resonance
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double offset = (B*2.0)-1.0;
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double sinOffset = sin(offset); //we can cache this, it's expensive
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double wet = C;
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double K = tan(M_PI * figureR[0]);
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double norm = 1.0 / (1.0 + K / figureR[1] + K * K);
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figureL[2] = figureR[2] = K / figureR[1] * norm;
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figureL[4] = figureR[4] = -figureR[2];
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figureL[5] = figureR[5] = 2.0 * (K * K - 1.0) * norm;
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figureL[6] = figureR[6] = (1.0 - K / figureR[1] + K * K) * norm;
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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 tempSample = (inputSample * figure[2]) + figure[7];
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//figure[7] = -(tempSample * figure[5]) + figure[8];
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//figure[8] = (inputSample * figure[4]) - (tempSample * figure[6]);
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//inputSample = tempSample + sin(drySample-tempSample);
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//or
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//inputSample = tempSample + ((sin(((drySample-tempSample)/boost)+offset)-sinOffset)*boost);
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//
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//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
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//the full frequencies but distorts like a real transformer. Purest case, and since
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//we are not using a high Q we can remove the extra sin/asin on the biquad.
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double tempSample = (inputSampleL * figureL[2]) + figureL[7];
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figureL[7] = -(tempSample * figureL[5]) + figureL[8];
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figureL[8] = (inputSampleL * figureL[4]) - (tempSample * figureL[6]);
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inputSampleL = tempSample + ((sin(((drySampleL-tempSample)/boost)+offset)-sinOffset)*boost);
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//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
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//the full frequencies but distorts like a real transformer. Since
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//we are not using a high Q we can remove the extra sin/asin on the biquad.
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tempSample = (inputSampleR * figureR[2]) + figureR[7];
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figureR[7] = -(tempSample * figureR[5]) + figureR[8];
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figureR[8] = (inputSampleR * figureR[4]) - (tempSample * figureR[6]);
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inputSampleR = tempSample + ((sin(((drySampleR-tempSample)/boost)+offset)-sinOffset)*boost);
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//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
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//the full frequencies but distorts like a real transformer. Since
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//we are not using a high Q we can remove the extra sin/asin on the biquad.
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if (wet !=1.0) {
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inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
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inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
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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 Coils::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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//[0] is frequency: 0.000001 to 0.499999 is near-zero to near-Nyquist
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//[1] is resonance, 0.7071 is Butterworth. Also can't be zero
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double boost = 1.0-pow(A,2);
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if (boost < 0.001) boost = 0.001; //there's a divide, we can't have this be zero
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figureL[0] = figureR[0] = 600.0/getSampleRate(); //fixed frequency, 600hz
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figureL[1] = figureR[1] = 0.023; //resonance
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double offset = (B*2.0)-1.0;
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double sinOffset = sin(offset); //we can cache this, it's expensive
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double wet = C;
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double K = tan(M_PI * figureR[0]);
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double norm = 1.0 / (1.0 + K / figureR[1] + K * K);
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figureL[2] = figureR[2] = K / figureR[1] * norm;
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figureL[4] = figureR[4] = -figureR[2];
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figureL[5] = figureR[5] = 2.0 * (K * K - 1.0) * norm;
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figureL[6] = figureR[6] = (1.0 - K / figureR[1] + K * K) * norm;
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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-43) inputSampleL = fpd * 1.18e-43;
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if (fabs(inputSampleR)<1.18e-43) inputSampleR = fpd * 1.18e-43;
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double drySampleL = inputSampleL;
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double drySampleR = inputSampleR;
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//double tempSample = (inputSample * figure[2]) + figure[7];
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//figure[7] = -(tempSample * figure[5]) + figure[8];
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//figure[8] = (inputSample * figure[4]) - (tempSample * figure[6]);
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//inputSample = tempSample + sin(drySample-tempSample);
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//or
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//inputSample = tempSample + ((sin(((drySample-tempSample)/boost)+offset)-sinOffset)*boost);
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//
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//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
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//the full frequencies but distorts like a real transformer. Purest case, and since
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//we are not using a high Q we can remove the extra sin/asin on the biquad.
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double tempSample = (inputSampleL * figureL[2]) + figureL[7];
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figureL[7] = -(tempSample * figureL[5]) + figureL[8];
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figureL[8] = (inputSampleL * figureL[4]) - (tempSample * figureL[6]);
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inputSampleL = tempSample + ((sin(((drySampleL-tempSample)/boost)+offset)-sinOffset)*boost);
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//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
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//the full frequencies but distorts like a real transformer. Since
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//we are not using a high Q we can remove the extra sin/asin on the biquad.
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tempSample = (inputSampleR * figureR[2]) + figureR[7];
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figureR[7] = -(tempSample * figureR[5]) + figureR[8];
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figureR[8] = (inputSampleR * figureR[4]) - (tempSample * figureR[6]);
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inputSampleR = tempSample + ((sin(((drySampleR-tempSample)/boost)+offset)-sinOffset)*boost);
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//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
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//the full frequencies but distorts like a real transformer. Since
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//we are not using a high Q we can remove the extra sin/asin on the biquad.
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if (wet !=1.0) {
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inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
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inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
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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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