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282 lines
12 KiB
C++
Executable file
282 lines
12 KiB
C++
Executable file
/* ========================================
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* Holt - Holt.h
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* Copyright (c) 2016 airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __Holt_H
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#include "Holt.h"
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#endif
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void Holt::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 alpha = pow(A,4)+0.00001;
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if (alpha > 1.0) alpha = 1.0;
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double beta = (alpha * pow(B,2))+0.00001;
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alpha += ((1.0-beta)*pow(A,3)); //correct for droop in frequency
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if (alpha > 1.0) alpha = 1.0;
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double trend;
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double forecast; //defining these here because we're copying the routine four times
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double aWet = 1.0;
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double bWet = 1.0;
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double cWet = 1.0;
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double dWet = C*4.0;
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//four-stage wet/dry control using progressive stages that bypass when not engaged
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if (dWet < 1.0) {aWet = dWet; bWet = 0.0; cWet = 0.0; dWet = 0.0;}
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else if (dWet < 2.0) {bWet = dWet - 1.0; cWet = 0.0; dWet = 0.0;}
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else if (dWet < 3.0) {cWet = dWet - 2.0; dWet = 0.0;}
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else {dWet -= 3.0;}
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//this is one way to make a little set of dry/wet stages that are successively added to the
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//output as the control is turned up. Each one independently goes from 0-1 and stays at 1
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//beyond that point: this is a way to progressively add a 'black box' sound processing
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//which lets you fall through to simpler processing at lower settings.
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double gain = D;
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double wet = E;
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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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if (aWet > 0.0) {
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trend = (beta * (inputSampleL - previousSampleAL) + ((0.999-beta) * previousTrendAL));
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forecast = previousSampleAL + previousTrendAL;
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inputSampleL = (alpha * inputSampleL) + ((0.999-alpha) * forecast);
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previousSampleAL = inputSampleL; previousTrendAL = trend;
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inputSampleL = (inputSampleL * aWet) + (drySampleL * (1.0-aWet));
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trend = (beta * (inputSampleR - previousSampleAR) + ((0.999-beta) * previousTrendAR));
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forecast = previousSampleAR + previousTrendAR;
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inputSampleR = (alpha * inputSampleR) + ((0.999-alpha) * forecast);
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previousSampleAR = inputSampleR; previousTrendAR = trend;
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inputSampleR = (inputSampleR * aWet) + (drySampleR * (1.0-aWet));
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}
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if (bWet > 0.0) {
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trend = (beta * (inputSampleL - previousSampleBL) + ((0.999-beta) * previousTrendBL));
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forecast = previousSampleBL + previousTrendBL;
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inputSampleL = (alpha * inputSampleL) + ((0.999-alpha) * forecast);
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previousSampleBL = inputSampleL; previousTrendBL = trend;
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inputSampleL = (inputSampleL * bWet) + (previousSampleAL * (1.0-bWet));
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trend = (beta * (inputSampleR - previousSampleBR) + ((0.999-beta) * previousTrendBR));
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forecast = previousSampleBR + previousTrendBR;
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inputSampleR = (alpha * inputSampleR) + ((0.999-alpha) * forecast);
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previousSampleBR = inputSampleR; previousTrendBR = trend;
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inputSampleR = (inputSampleR * bWet) + (previousSampleAR * (1.0-bWet));
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}
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if (cWet > 0.0) {
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trend = (beta * (inputSampleL - previousSampleCL) + ((0.999-beta) * previousTrendCL));
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forecast = previousSampleCL + previousTrendCL;
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inputSampleL = (alpha * inputSampleL) + ((0.999-alpha) * forecast);
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previousSampleCL = inputSampleL; previousTrendCL = trend;
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inputSampleL = (inputSampleL * cWet) + (previousSampleBL * (1.0-cWet));
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trend = (beta * (inputSampleR - previousSampleCR) + ((0.999-beta) * previousTrendCR));
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forecast = previousSampleCR + previousTrendCR;
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inputSampleR = (alpha * inputSampleR) + ((0.999-alpha) * forecast);
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previousSampleCR = inputSampleR; previousTrendCR = trend;
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inputSampleR = (inputSampleR * cWet) + (previousSampleBR * (1.0-cWet));
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}
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if (dWet > 0.0) {
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trend = (beta * (inputSampleL - previousSampleDL) + ((0.999-beta) * previousTrendDL));
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forecast = previousSampleDL + previousTrendDL;
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inputSampleL = (alpha * inputSampleL) + ((0.999-alpha) * forecast);
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previousSampleDL = inputSampleL; previousTrendDL = trend;
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inputSampleL = (inputSampleL * dWet) + (previousSampleCL * (1.0-dWet));
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trend = (beta * (inputSampleR - previousSampleDR) + ((0.999-beta) * previousTrendDR));
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forecast = previousSampleDR + previousTrendDR;
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inputSampleR = (alpha * inputSampleR) + ((0.999-alpha) * forecast);
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previousSampleDR = inputSampleR; previousTrendDR = trend;
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inputSampleR = (inputSampleR * dWet) + (previousSampleCR * (1.0-dWet));
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}
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if (gain < 1.0) {
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inputSampleL *= gain;
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inputSampleR *= gain;
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}
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//clip to 1.2533141373155 to reach maximum output
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if (inputSampleL > 1.2533141373155) inputSampleL = 1.2533141373155;
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if (inputSampleL < -1.2533141373155) inputSampleL = -1.2533141373155;
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if (inputSampleR > 1.2533141373155) inputSampleR = 1.2533141373155;
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if (inputSampleR < -1.2533141373155) inputSampleR = -1.2533141373155;
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inputSampleL = sin(inputSampleL * fabs(inputSampleL)) / ((fabs(inputSampleL) == 0.0) ?1:fabs(inputSampleL));
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inputSampleR = sin(inputSampleR * fabs(inputSampleR)) / ((fabs(inputSampleR) == 0.0) ?1:fabs(inputSampleR));
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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 Holt::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 alpha = pow(A,4)+0.00001;
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if (alpha > 1.0) alpha = 1.0;
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double beta = (alpha * pow(B,2))+0.00001;
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alpha += ((1.0-beta)*pow(A,3)); //correct for droop in frequency
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if (alpha > 1.0) alpha = 1.0;
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double trend;
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double forecast; //defining these here because we're copying the routine four times
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double aWet = 1.0;
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double bWet = 1.0;
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double cWet = 1.0;
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double dWet = C*4.0;
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//four-stage wet/dry control using progressive stages that bypass when not engaged
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if (dWet < 1.0) {aWet = dWet; bWet = 0.0; cWet = 0.0; dWet = 0.0;}
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else if (dWet < 2.0) {bWet = dWet - 1.0; cWet = 0.0; dWet = 0.0;}
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else if (dWet < 3.0) {cWet = dWet - 2.0; dWet = 0.0;}
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else {dWet -= 3.0;}
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//this is one way to make a little set of dry/wet stages that are successively added to the
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//output as the control is turned up. Each one independently goes from 0-1 and stays at 1
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//beyond that point: this is a way to progressively add a 'black box' sound processing
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//which lets you fall through to simpler processing at lower settings.
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double gain = D;
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double wet = E;
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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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if (aWet > 0.0) {
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trend = (beta * (inputSampleL - previousSampleAL) + ((0.999-beta) * previousTrendAL));
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forecast = previousSampleAL + previousTrendAL;
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inputSampleL = (alpha * inputSampleL) + ((0.999-alpha) * forecast);
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previousSampleAL = inputSampleL; previousTrendAL = trend;
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inputSampleL = (inputSampleL * aWet) + (drySampleL * (1.0-aWet));
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trend = (beta * (inputSampleR - previousSampleAR) + ((0.999-beta) * previousTrendAR));
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forecast = previousSampleAR + previousTrendAR;
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inputSampleR = (alpha * inputSampleR) + ((0.999-alpha) * forecast);
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previousSampleAR = inputSampleR; previousTrendAR = trend;
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inputSampleR = (inputSampleR * aWet) + (drySampleR * (1.0-aWet));
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}
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if (bWet > 0.0) {
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trend = (beta * (inputSampleL - previousSampleBL) + ((0.999-beta) * previousTrendBL));
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forecast = previousSampleBL + previousTrendBL;
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inputSampleL = (alpha * inputSampleL) + ((0.999-alpha) * forecast);
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previousSampleBL = inputSampleL; previousTrendBL = trend;
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inputSampleL = (inputSampleL * bWet) + (previousSampleAL * (1.0-bWet));
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trend = (beta * (inputSampleR - previousSampleBR) + ((0.999-beta) * previousTrendBR));
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forecast = previousSampleBR + previousTrendBR;
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inputSampleR = (alpha * inputSampleR) + ((0.999-alpha) * forecast);
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previousSampleBR = inputSampleR; previousTrendBR = trend;
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inputSampleR = (inputSampleR * bWet) + (previousSampleAR * (1.0-bWet));
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}
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if (cWet > 0.0) {
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trend = (beta * (inputSampleL - previousSampleCL) + ((0.999-beta) * previousTrendCL));
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forecast = previousSampleCL + previousTrendCL;
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inputSampleL = (alpha * inputSampleL) + ((0.999-alpha) * forecast);
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previousSampleCL = inputSampleL; previousTrendCL = trend;
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inputSampleL = (inputSampleL * cWet) + (previousSampleBL * (1.0-cWet));
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trend = (beta * (inputSampleR - previousSampleCR) + ((0.999-beta) * previousTrendCR));
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forecast = previousSampleCR + previousTrendCR;
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inputSampleR = (alpha * inputSampleR) + ((0.999-alpha) * forecast);
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previousSampleCR = inputSampleR; previousTrendCR = trend;
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inputSampleR = (inputSampleR * cWet) + (previousSampleBR * (1.0-cWet));
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}
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if (dWet > 0.0) {
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trend = (beta * (inputSampleL - previousSampleDL) + ((0.999-beta) * previousTrendDL));
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forecast = previousSampleDL + previousTrendDL;
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inputSampleL = (alpha * inputSampleL) + ((0.999-alpha) * forecast);
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previousSampleDL = inputSampleL; previousTrendDL = trend;
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inputSampleL = (inputSampleL * dWet) + (previousSampleCL * (1.0-dWet));
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trend = (beta * (inputSampleR - previousSampleDR) + ((0.999-beta) * previousTrendDR));
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forecast = previousSampleDR + previousTrendDR;
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inputSampleR = (alpha * inputSampleR) + ((0.999-alpha) * forecast);
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previousSampleDR = inputSampleR; previousTrendDR = trend;
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inputSampleR = (inputSampleR * dWet) + (previousSampleCR * (1.0-dWet));
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}
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if (gain < 1.0) {
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inputSampleL *= gain;
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inputSampleR *= gain;
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}
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//clip to 1.2533141373155 to reach maximum output
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if (inputSampleL > 1.2533141373155) inputSampleL = 1.2533141373155;
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if (inputSampleL < -1.2533141373155) inputSampleL = -1.2533141373155;
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if (inputSampleR > 1.2533141373155) inputSampleR = 1.2533141373155;
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if (inputSampleR < -1.2533141373155) inputSampleR = -1.2533141373155;
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inputSampleL = sin(inputSampleL * fabs(inputSampleL)) / ((fabs(inputSampleL) == 0.0) ?1:fabs(inputSampleL));
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inputSampleR = sin(inputSampleR * fabs(inputSampleR)) / ((fabs(inputSampleR) == 0.0) ?1:fabs(inputSampleR));
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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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