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airwindows/plugins/WinVST/SmoothEQ2/SmoothEQ2Proc.cpp
Christopher Johnson 05cb274c27 kCathedral5
2025-08-23 22:30:02 -04:00

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/* ========================================
* SmoothEQ2 - SmoothEQ2.h
* Copyright (c) airwindows, Airwindows uses the MIT license
* ======================================== */
#ifndef __SmoothEQ2_H
#include "SmoothEQ2.h"
#endif
void SmoothEQ2::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames)
{
float* in1 = inputs[0];
float* in2 = inputs[1];
float* out1 = outputs[0];
float* out2 = outputs[1];
double trebleGain = (A-0.5)*2.0;
trebleGain = 1.0+(trebleGain*fabs(trebleGain)*fabs(trebleGain));
double highmidGain = (B-0.5)*2.0;
highmidGain = 1.0+(highmidGain*fabs(highmidGain)*fabs(highmidGain));
double lowmidGain = (C-0.5)*2.0;
lowmidGain = 1.0+(lowmidGain*fabs(lowmidGain)*fabs(lowmidGain));
double bassGain = (D-0.5)*2.0;
bassGain = 1.0+(bassGain*fabs(bassGain)*fabs(bassGain));
double trebleRef = E-0.5;
double highmidRef = F-0.5;
double lowmidRef = G-0.5;
double bassRef = H-0.5;
double highF = 0.75 + ((trebleRef+trebleRef+trebleRef+highmidRef)*0.125);
double bassF = 0.25 + ((lowmidRef+bassRef+bassRef+bassRef)*0.125);
double midF = (highF*0.5) + (bassF*0.5) + ((highmidRef+lowmidRef)*0.125);
double highQ = fmax(fmin(1.0+(highmidRef-trebleRef),4.0),0.125);
double midQ = fmax(fmin(1.0+(lowmidRef-highmidRef),4.0),0.125);
double lowQ = fmax(fmin(1.0+(bassRef-lowmidRef),4.0),0.125);
highA[biq_freq] = ((pow(highF,3)*20000.0)/getSampleRate());
highC[biq_freq] = highB[biq_freq] = highA[biq_freq] = fmax(fmin(highA[biq_freq],0.4999),0.00025);
double highFreq = pow(highF,3)*20000.0;
double omega = 2.0*M_PI*(highFreq/getSampleRate());
double K = 2.0-cos(omega);
double highCoef = -sqrt((K*K)-1.0)+K;
highA[biq_reso] = 2.24697960 * highQ;
highB[biq_reso] = 0.80193774 * highQ;
highC[biq_reso] = 0.55495813 * highQ;
midA[biq_freq] = ((pow(midF,3)*20000.0)/getSampleRate());
midC[biq_freq] = midB[biq_freq] = midA[biq_freq] = fmax(fmin(midA[biq_freq],0.4999),0.00025);
double midFreq = pow(midF,3)*20000.0;
omega = 2.0*M_PI*(midFreq/getSampleRate());
K = 2.0-cos(omega);
double midCoef = -sqrt((K*K)-1.0)+K;
midA[biq_reso] = 2.24697960 * midQ;
midB[biq_reso] = 0.80193774 * midQ;
midC[biq_reso] = 0.55495813 * midQ;
lowA[biq_freq] = ((pow(bassF,3)*20000.0)/getSampleRate());
lowC[biq_freq] = lowB[biq_freq] = lowA[biq_freq] = fmax(fmin(lowA[biq_freq],0.4999),0.00025);
double lowFreq = pow(bassF,3)*20000.0;
omega = 2.0*M_PI*(lowFreq/getSampleRate());
K = 2.0-cos(omega);
double lowCoef = -sqrt((K*K)-1.0)+K;
lowA[biq_reso] = 2.24697960 * lowQ;
lowB[biq_reso] = 0.80193774 * lowQ;
lowC[biq_reso] = 0.55495813 * lowQ;
K = tan(M_PI * highA[biq_freq]);
double norm = 1.0 / (1.0 + K / highA[biq_reso] + K * K);
highA[biq_a0] = K * K * norm;
highA[biq_a1] = 2.0 * highA[biq_a0];
highA[biq_a2] = highA[biq_a0];
highA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
highA[biq_b2] = (1.0 - K / highA[biq_reso] + K * K) * norm;
K = tan(M_PI * highB[biq_freq]);
norm = 1.0 / (1.0 + K / highB[biq_reso] + K * K);
highB[biq_a0] = K * K * norm;
highB[biq_a1] = 2.0 * highB[biq_a0];
highB[biq_a2] = highB[biq_a0];
highB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
highB[biq_b2] = (1.0 - K / highB[biq_reso] + K * K) * norm;
K = tan(M_PI * highC[biq_freq]);
norm = 1.0 / (1.0 + K / highC[biq_reso] + K * K);
highC[biq_a0] = K * K * norm;
highC[biq_a1] = 2.0 * highC[biq_a0];
highC[biq_a2] = highC[biq_a0];
highC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
highC[biq_b2] = (1.0 - K / highC[biq_reso] + K * K) * norm;
K = tan(M_PI * midA[biq_freq]);
norm = 1.0 / (1.0 + K / midA[biq_reso] + K * K);
midA[biq_a0] = K * K * norm;
midA[biq_a1] = 2.0 * midA[biq_a0];
midA[biq_a2] = midA[biq_a0];
midA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
midA[biq_b2] = (1.0 - K / midA[biq_reso] + K * K) * norm;
K = tan(M_PI * midB[biq_freq]);
norm = 1.0 / (1.0 + K / midB[biq_reso] + K * K);
midB[biq_a0] = K * K * norm;
midB[biq_a1] = 2.0 * midB[biq_a0];
midB[biq_a2] = midB[biq_a0];
midB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
midB[biq_b2] = (1.0 - K / midB[biq_reso] + K * K) * norm;
K = tan(M_PI * midC[biq_freq]);
norm = 1.0 / (1.0 + K / midC[biq_reso] + K * K);
midC[biq_a0] = K * K * norm;
midC[biq_a1] = 2.0 * midC[biq_a0];
midC[biq_a2] = midC[biq_a0];
midC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
midC[biq_b2] = (1.0 - K / midC[biq_reso] + K * K) * norm;
K = tan(M_PI * lowA[biq_freq]);
norm = 1.0 / (1.0 + K / lowA[biq_reso] + K * K);
lowA[biq_a0] = K * K * norm;
lowA[biq_a1] = 2.0 * lowA[biq_a0];
lowA[biq_a2] = lowA[biq_a0];
lowA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
lowA[biq_b2] = (1.0 - K / lowA[biq_reso] + K * K) * norm;
K = tan(M_PI * lowB[biq_freq]);
norm = 1.0 / (1.0 + K / lowB[biq_reso] + K * K);
lowB[biq_a0] = K * K * norm;
lowB[biq_a1] = 2.0 * lowB[biq_a0];
lowB[biq_a2] = lowB[biq_a0];
lowB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
lowB[biq_b2] = (1.0 - K / lowB[biq_reso] + K * K) * norm;
K = tan(M_PI * lowC[biq_freq]);
norm = 1.0 / (1.0 + K / lowC[biq_reso] + K * K);
lowC[biq_a0] = K * K * norm;
lowC[biq_a1] = 2.0 * lowC[biq_a0];
lowC[biq_a2] = lowC[biq_a0];
lowC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
lowC[biq_b2] = (1.0 - K / lowC[biq_reso] + K * K) * norm;
while (--sampleFrames >= 0)
{
double inputSampleL = *in1;
double inputSampleR = *in2;
if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
double trebleL = inputSampleL;
double outSample = (trebleL * highA[biq_a0]) + highA[biq_sL1];
highA[biq_sL1] = (trebleL * highA[biq_a1]) - (outSample * highA[biq_b1]) + highA[biq_sL2];
highA[biq_sL2] = (trebleL * highA[biq_a2]) - (outSample * highA[biq_b2]);
double highmidL = outSample; trebleL -= highmidL;
outSample = (highmidL * midA[biq_a0]) + midA[biq_sL1];
midA[biq_sL1] = (highmidL * midA[biq_a1]) - (outSample * midA[biq_b1]) + midA[biq_sL2];
midA[biq_sL2] = (highmidL * midA[biq_a2]) - (outSample * midA[biq_b2]);
double lowmidL = outSample; highmidL -= lowmidL;
outSample = (lowmidL * lowA[biq_a0]) + lowA[biq_sL1];
lowA[biq_sL1] = (lowmidL * lowA[biq_a1]) - (outSample * lowA[biq_b1]) + lowA[biq_sL2];
lowA[biq_sL2] = (lowmidL * lowA[biq_a2]) - (outSample * lowA[biq_b2]);
double bassL = outSample; lowmidL -= bassL;
trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
//first stage of three crossovers
outSample = (trebleL * highB[biq_a0]) + highB[biq_sL1];
highB[biq_sL1] = (trebleL * highB[biq_a1]) - (outSample * highB[biq_b1]) + highB[biq_sL2];
highB[biq_sL2] = (trebleL * highB[biq_a2]) - (outSample * highB[biq_b2]);
highmidL = outSample; trebleL -= highmidL;
outSample = (highmidL * midB[biq_a0]) + midB[biq_sL1];
midB[biq_sL1] = (highmidL * midB[biq_a1]) - (outSample * midB[biq_b1]) + midB[biq_sL2];
midB[biq_sL2] = (highmidL * midB[biq_a2]) - (outSample * midB[biq_b2]);
lowmidL = outSample; highmidL -= lowmidL;
outSample = (lowmidL * lowB[biq_a0]) + lowB[biq_sL1];
lowB[biq_sL1] = (lowmidL * lowB[biq_a1]) - (outSample * lowB[biq_b1]) + lowB[biq_sL2];
lowB[biq_sL2] = (lowmidL * lowB[biq_a2]) - (outSample * lowB[biq_b2]);
bassL = outSample; lowmidL -= bassL;
trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
//second stage of three crossovers
outSample = (trebleL * highC[biq_a0]) + highC[biq_sL1];
highC[biq_sL1] = (trebleL * highC[biq_a1]) - (outSample * highC[biq_b1]) + highC[biq_sL2];
highC[biq_sL2] = (trebleL * highC[biq_a2]) - (outSample * highC[biq_b2]);
highmidL = outSample; trebleL -= highmidL;
outSample = (highmidL * midC[biq_a0]) + midC[biq_sL1];
midC[biq_sL1] = (highmidL * midC[biq_a1]) - (outSample * midC[biq_b1]) + midC[biq_sL2];
midC[biq_sL2] = (highmidL * midC[biq_a2]) - (outSample * midC[biq_b2]);
lowmidL = outSample; highmidL -= lowmidL;
outSample = (lowmidL * lowC[biq_a0]) + lowC[biq_sL1];
lowC[biq_sL1] = (lowmidL * lowC[biq_a1]) - (outSample * lowC[biq_b1]) + lowC[biq_sL2];
lowC[biq_sL2] = (lowmidL * lowC[biq_a2]) - (outSample * lowC[biq_b2]);
bassL = outSample; lowmidL -= bassL;
trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
//third stage of three crossovers
highLIIR = (highLIIR*highCoef) + (trebleL*(1.0-highCoef));
highmidL = highLIIR; trebleL -= highmidL;
midLIIR = (midLIIR*midCoef) + (highmidL*(1.0-midCoef));
lowmidL = midLIIR; highmidL -= lowmidL;
lowLIIR = (lowLIIR*lowCoef) + (lowmidL*(1.0-lowCoef));
bassL = lowLIIR; lowmidL -= bassL;
inputSampleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
//fourth stage of three crossovers is the exponential filters
double trebleR = inputSampleR;
outSample = (trebleR * highA[biq_a0]) + highA[biq_sR1];
highA[biq_sR1] = (trebleR * highA[biq_a1]) - (outSample * highA[biq_b1]) + highA[biq_sR2];
highA[biq_sR2] = (trebleR * highA[biq_a2]) - (outSample * highA[biq_b2]);
double highmidR = outSample; trebleR -= highmidR;
outSample = (highmidR * midA[biq_a0]) + midA[biq_sR1];
midA[biq_sR1] = (highmidR * midA[biq_a1]) - (outSample * midA[biq_b1]) + midA[biq_sR2];
midA[biq_sR2] = (highmidR * midA[biq_a2]) - (outSample * midA[biq_b2]);
double lowmidR = outSample; highmidR -= lowmidR;
outSample = (lowmidR * lowA[biq_a0]) + lowA[biq_sR1];
lowA[biq_sR1] = (lowmidR * lowA[biq_a1]) - (outSample * lowA[biq_b1]) + lowA[biq_sR2];
lowA[biq_sR2] = (lowmidR * lowA[biq_a2]) - (outSample * lowA[biq_b2]);
double bassR = outSample; lowmidR -= bassR;
trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
//first stage of three crossovers
outSample = (trebleR * highB[biq_a0]) + highB[biq_sR1];
highB[biq_sR1] = (trebleR * highB[biq_a1]) - (outSample * highB[biq_b1]) + highB[biq_sR2];
highB[biq_sR2] = (trebleR * highB[biq_a2]) - (outSample * highB[biq_b2]);
highmidR = outSample; trebleR -= highmidR;
outSample = (highmidR * midB[biq_a0]) + midB[biq_sR1];
midB[biq_sR1] = (highmidR * midB[biq_a1]) - (outSample * midB[biq_b1]) + midB[biq_sR2];
midB[biq_sR2] = (highmidR * midB[biq_a2]) - (outSample * midB[biq_b2]);
lowmidR = outSample; highmidR -= lowmidR;
outSample = (lowmidR * lowB[biq_a0]) + lowB[biq_sR1];
lowB[biq_sR1] = (lowmidR * lowB[biq_a1]) - (outSample * lowB[biq_b1]) + lowB[biq_sR2];
lowB[biq_sR2] = (lowmidR * lowB[biq_a2]) - (outSample * lowB[biq_b2]);
bassR = outSample; lowmidR -= bassR;
trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
//second stage of three crossovers
outSample = (trebleR * highC[biq_a0]) + highC[biq_sR1];
highC[biq_sR1] = (trebleR * highC[biq_a1]) - (outSample * highC[biq_b1]) + highC[biq_sR2];
highC[biq_sR2] = (trebleR * highC[biq_a2]) - (outSample * highC[biq_b2]);
highmidR = outSample; trebleR -= highmidR;
outSample = (highmidR * midC[biq_a0]) + midC[biq_sR1];
midC[biq_sR1] = (highmidR * midC[biq_a1]) - (outSample * midC[biq_b1]) + midC[biq_sR2];
midC[biq_sR2] = (highmidR * midC[biq_a2]) - (outSample * midC[biq_b2]);
lowmidR = outSample; highmidR -= lowmidR;
outSample = (lowmidR * lowC[biq_a0]) + lowC[biq_sR1];
lowC[biq_sR1] = (lowmidR * lowC[biq_a1]) - (outSample * lowC[biq_b1]) + lowC[biq_sR2];
lowC[biq_sR2] = (lowmidR * lowC[biq_a2]) - (outSample * lowC[biq_b2]);
bassR = outSample; lowmidR -= bassR;
trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
//third stage of three crossovers
highRIIR = (highRIIR*highCoef) + (trebleR*(1.0-highCoef));
highmidR = highRIIR; trebleR -= highmidR;
midRIIR = (midRIIR*midCoef) + (highmidR*(1.0-midCoef));
lowmidR = midRIIR; highmidR -= lowmidR;
lowRIIR = (lowRIIR*lowCoef) + (lowmidR*(1.0-lowCoef));
bassR = lowRIIR; lowmidR -= bassR;
inputSampleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
//fourth stage of three crossovers is the exponential filters
//begin 32 bit stereo floating point dither
int expon; frexpf((float)inputSampleL, &expon);
fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
frexpf((float)inputSampleR, &expon);
fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
//end 32 bit stereo floating point dither
*out1 = inputSampleL;
*out2 = inputSampleR;
in1++;
in2++;
out1++;
out2++;
}
}
void SmoothEQ2::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames)
{
double* in1 = inputs[0];
double* in2 = inputs[1];
double* out1 = outputs[0];
double* out2 = outputs[1];
double trebleGain = (A-0.5)*2.0;
trebleGain = 1.0+(trebleGain*fabs(trebleGain)*fabs(trebleGain));
double highmidGain = (B-0.5)*2.0;
highmidGain = 1.0+(highmidGain*fabs(highmidGain)*fabs(highmidGain));
double lowmidGain = (C-0.5)*2.0;
lowmidGain = 1.0+(lowmidGain*fabs(lowmidGain)*fabs(lowmidGain));
double bassGain = (D-0.5)*2.0;
bassGain = 1.0+(bassGain*fabs(bassGain)*fabs(bassGain));
double trebleRef = E-0.5;
double highmidRef = F-0.5;
double lowmidRef = G-0.5;
double bassRef = H-0.5;
double highF = 0.75 + ((trebleRef+trebleRef+trebleRef+highmidRef)*0.125);
double bassF = 0.25 + ((lowmidRef+bassRef+bassRef+bassRef)*0.125);
double midF = (highF*0.5) + (bassF*0.5) + ((highmidRef+lowmidRef)*0.125);
double highQ = fmax(fmin(1.0+(highmidRef-trebleRef),4.0),0.125);
double midQ = fmax(fmin(1.0+(lowmidRef-highmidRef),4.0),0.125);
double lowQ = fmax(fmin(1.0+(bassRef-lowmidRef),4.0),0.125);
highA[biq_freq] = ((pow(highF,3)*20000.0)/getSampleRate());
highC[biq_freq] = highB[biq_freq] = highA[biq_freq] = fmax(fmin(highA[biq_freq],0.4999),0.00025);
double highFreq = pow(highF,3)*20000.0;
double omega = 2.0*M_PI*(highFreq/getSampleRate());
double K = 2.0-cos(omega);
double highCoef = -sqrt((K*K)-1.0)+K;
highA[biq_reso] = 2.24697960 * highQ;
highB[biq_reso] = 0.80193774 * highQ;
highC[biq_reso] = 0.55495813 * highQ;
midA[biq_freq] = ((pow(midF,3)*20000.0)/getSampleRate());
midC[biq_freq] = midB[biq_freq] = midA[biq_freq] = fmax(fmin(midA[biq_freq],0.4999),0.00025);
double midFreq = pow(midF,3)*20000.0;
omega = 2.0*M_PI*(midFreq/getSampleRate());
K = 2.0-cos(omega);
double midCoef = -sqrt((K*K)-1.0)+K;
midA[biq_reso] = 2.24697960 * midQ;
midB[biq_reso] = 0.80193774 * midQ;
midC[biq_reso] = 0.55495813 * midQ;
lowA[biq_freq] = ((pow(bassF,3)*20000.0)/getSampleRate());
lowC[biq_freq] = lowB[biq_freq] = lowA[biq_freq] = fmax(fmin(lowA[biq_freq],0.4999),0.00025);
double lowFreq = pow(bassF,3)*20000.0;
omega = 2.0*M_PI*(lowFreq/getSampleRate());
K = 2.0-cos(omega);
double lowCoef = -sqrt((K*K)-1.0)+K;
lowA[biq_reso] = 2.24697960 * lowQ;
lowB[biq_reso] = 0.80193774 * lowQ;
lowC[biq_reso] = 0.55495813 * lowQ;
K = tan(M_PI * highA[biq_freq]);
double norm = 1.0 / (1.0 + K / highA[biq_reso] + K * K);
highA[biq_a0] = K * K * norm;
highA[biq_a1] = 2.0 * highA[biq_a0];
highA[biq_a2] = highA[biq_a0];
highA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
highA[biq_b2] = (1.0 - K / highA[biq_reso] + K * K) * norm;
K = tan(M_PI * highB[biq_freq]);
norm = 1.0 / (1.0 + K / highB[biq_reso] + K * K);
highB[biq_a0] = K * K * norm;
highB[biq_a1] = 2.0 * highB[biq_a0];
highB[biq_a2] = highB[biq_a0];
highB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
highB[biq_b2] = (1.0 - K / highB[biq_reso] + K * K) * norm;
K = tan(M_PI * highC[biq_freq]);
norm = 1.0 / (1.0 + K / highC[biq_reso] + K * K);
highC[biq_a0] = K * K * norm;
highC[biq_a1] = 2.0 * highC[biq_a0];
highC[biq_a2] = highC[biq_a0];
highC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
highC[biq_b2] = (1.0 - K / highC[biq_reso] + K * K) * norm;
K = tan(M_PI * midA[biq_freq]);
norm = 1.0 / (1.0 + K / midA[biq_reso] + K * K);
midA[biq_a0] = K * K * norm;
midA[biq_a1] = 2.0 * midA[biq_a0];
midA[biq_a2] = midA[biq_a0];
midA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
midA[biq_b2] = (1.0 - K / midA[biq_reso] + K * K) * norm;
K = tan(M_PI * midB[biq_freq]);
norm = 1.0 / (1.0 + K / midB[biq_reso] + K * K);
midB[biq_a0] = K * K * norm;
midB[biq_a1] = 2.0 * midB[biq_a0];
midB[biq_a2] = midB[biq_a0];
midB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
midB[biq_b2] = (1.0 - K / midB[biq_reso] + K * K) * norm;
K = tan(M_PI * midC[biq_freq]);
norm = 1.0 / (1.0 + K / midC[biq_reso] + K * K);
midC[biq_a0] = K * K * norm;
midC[biq_a1] = 2.0 * midC[biq_a0];
midC[biq_a2] = midC[biq_a0];
midC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
midC[biq_b2] = (1.0 - K / midC[biq_reso] + K * K) * norm;
K = tan(M_PI * lowA[biq_freq]);
norm = 1.0 / (1.0 + K / lowA[biq_reso] + K * K);
lowA[biq_a0] = K * K * norm;
lowA[biq_a1] = 2.0 * lowA[biq_a0];
lowA[biq_a2] = lowA[biq_a0];
lowA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
lowA[biq_b2] = (1.0 - K / lowA[biq_reso] + K * K) * norm;
K = tan(M_PI * lowB[biq_freq]);
norm = 1.0 / (1.0 + K / lowB[biq_reso] + K * K);
lowB[biq_a0] = K * K * norm;
lowB[biq_a1] = 2.0 * lowB[biq_a0];
lowB[biq_a2] = lowB[biq_a0];
lowB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
lowB[biq_b2] = (1.0 - K / lowB[biq_reso] + K * K) * norm;
K = tan(M_PI * lowC[biq_freq]);
norm = 1.0 / (1.0 + K / lowC[biq_reso] + K * K);
lowC[biq_a0] = K * K * norm;
lowC[biq_a1] = 2.0 * lowC[biq_a0];
lowC[biq_a2] = lowC[biq_a0];
lowC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
lowC[biq_b2] = (1.0 - K / lowC[biq_reso] + K * K) * norm;
while (--sampleFrames >= 0)
{
double inputSampleL = *in1;
double inputSampleR = *in2;
if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
double trebleL = inputSampleL;
double outSample = (trebleL * highA[biq_a0]) + highA[biq_sL1];
highA[biq_sL1] = (trebleL * highA[biq_a1]) - (outSample * highA[biq_b1]) + highA[biq_sL2];
highA[biq_sL2] = (trebleL * highA[biq_a2]) - (outSample * highA[biq_b2]);
double highmidL = outSample; trebleL -= highmidL;
outSample = (highmidL * midA[biq_a0]) + midA[biq_sL1];
midA[biq_sL1] = (highmidL * midA[biq_a1]) - (outSample * midA[biq_b1]) + midA[biq_sL2];
midA[biq_sL2] = (highmidL * midA[biq_a2]) - (outSample * midA[biq_b2]);
double lowmidL = outSample; highmidL -= lowmidL;
outSample = (lowmidL * lowA[biq_a0]) + lowA[biq_sL1];
lowA[biq_sL1] = (lowmidL * lowA[biq_a1]) - (outSample * lowA[biq_b1]) + lowA[biq_sL2];
lowA[biq_sL2] = (lowmidL * lowA[biq_a2]) - (outSample * lowA[biq_b2]);
double bassL = outSample; lowmidL -= bassL;
trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
//first stage of three crossovers
outSample = (trebleL * highB[biq_a0]) + highB[biq_sL1];
highB[biq_sL1] = (trebleL * highB[biq_a1]) - (outSample * highB[biq_b1]) + highB[biq_sL2];
highB[biq_sL2] = (trebleL * highB[biq_a2]) - (outSample * highB[biq_b2]);
highmidL = outSample; trebleL -= highmidL;
outSample = (highmidL * midB[biq_a0]) + midB[biq_sL1];
midB[biq_sL1] = (highmidL * midB[biq_a1]) - (outSample * midB[biq_b1]) + midB[biq_sL2];
midB[biq_sL2] = (highmidL * midB[biq_a2]) - (outSample * midB[biq_b2]);
lowmidL = outSample; highmidL -= lowmidL;
outSample = (lowmidL * lowB[biq_a0]) + lowB[biq_sL1];
lowB[biq_sL1] = (lowmidL * lowB[biq_a1]) - (outSample * lowB[biq_b1]) + lowB[biq_sL2];
lowB[biq_sL2] = (lowmidL * lowB[biq_a2]) - (outSample * lowB[biq_b2]);
bassL = outSample; lowmidL -= bassL;
trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
//second stage of three crossovers
outSample = (trebleL * highC[biq_a0]) + highC[biq_sL1];
highC[biq_sL1] = (trebleL * highC[biq_a1]) - (outSample * highC[biq_b1]) + highC[biq_sL2];
highC[biq_sL2] = (trebleL * highC[biq_a2]) - (outSample * highC[biq_b2]);
highmidL = outSample; trebleL -= highmidL;
outSample = (highmidL * midC[biq_a0]) + midC[biq_sL1];
midC[biq_sL1] = (highmidL * midC[biq_a1]) - (outSample * midC[biq_b1]) + midC[biq_sL2];
midC[biq_sL2] = (highmidL * midC[biq_a2]) - (outSample * midC[biq_b2]);
lowmidL = outSample; highmidL -= lowmidL;
outSample = (lowmidL * lowC[biq_a0]) + lowC[biq_sL1];
lowC[biq_sL1] = (lowmidL * lowC[biq_a1]) - (outSample * lowC[biq_b1]) + lowC[biq_sL2];
lowC[biq_sL2] = (lowmidL * lowC[biq_a2]) - (outSample * lowC[biq_b2]);
bassL = outSample; lowmidL -= bassL;
trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
//third stage of three crossovers
highLIIR = (highLIIR*highCoef) + (trebleL*(1.0-highCoef));
highmidL = highLIIR; trebleL -= highmidL;
midLIIR = (midLIIR*midCoef) + (highmidL*(1.0-midCoef));
lowmidL = midLIIR; highmidL -= lowmidL;
lowLIIR = (lowLIIR*lowCoef) + (lowmidL*(1.0-lowCoef));
bassL = lowLIIR; lowmidL -= bassL;
inputSampleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
//fourth stage of three crossovers is the exponential filters
double trebleR = inputSampleR;
outSample = (trebleR * highA[biq_a0]) + highA[biq_sR1];
highA[biq_sR1] = (trebleR * highA[biq_a1]) - (outSample * highA[biq_b1]) + highA[biq_sR2];
highA[biq_sR2] = (trebleR * highA[biq_a2]) - (outSample * highA[biq_b2]);
double highmidR = outSample; trebleR -= highmidR;
outSample = (highmidR * midA[biq_a0]) + midA[biq_sR1];
midA[biq_sR1] = (highmidR * midA[biq_a1]) - (outSample * midA[biq_b1]) + midA[biq_sR2];
midA[biq_sR2] = (highmidR * midA[biq_a2]) - (outSample * midA[biq_b2]);
double lowmidR = outSample; highmidR -= lowmidR;
outSample = (lowmidR * lowA[biq_a0]) + lowA[biq_sR1];
lowA[biq_sR1] = (lowmidR * lowA[biq_a1]) - (outSample * lowA[biq_b1]) + lowA[biq_sR2];
lowA[biq_sR2] = (lowmidR * lowA[biq_a2]) - (outSample * lowA[biq_b2]);
double bassR = outSample; lowmidR -= bassR;
trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
//first stage of three crossovers
outSample = (trebleR * highB[biq_a0]) + highB[biq_sR1];
highB[biq_sR1] = (trebleR * highB[biq_a1]) - (outSample * highB[biq_b1]) + highB[biq_sR2];
highB[biq_sR2] = (trebleR * highB[biq_a2]) - (outSample * highB[biq_b2]);
highmidR = outSample; trebleR -= highmidR;
outSample = (highmidR * midB[biq_a0]) + midB[biq_sR1];
midB[biq_sR1] = (highmidR * midB[biq_a1]) - (outSample * midB[biq_b1]) + midB[biq_sR2];
midB[biq_sR2] = (highmidR * midB[biq_a2]) - (outSample * midB[biq_b2]);
lowmidR = outSample; highmidR -= lowmidR;
outSample = (lowmidR * lowB[biq_a0]) + lowB[biq_sR1];
lowB[biq_sR1] = (lowmidR * lowB[biq_a1]) - (outSample * lowB[biq_b1]) + lowB[biq_sR2];
lowB[biq_sR2] = (lowmidR * lowB[biq_a2]) - (outSample * lowB[biq_b2]);
bassR = outSample; lowmidR -= bassR;
trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
//second stage of three crossovers
outSample = (trebleR * highC[biq_a0]) + highC[biq_sR1];
highC[biq_sR1] = (trebleR * highC[biq_a1]) - (outSample * highC[biq_b1]) + highC[biq_sR2];
highC[biq_sR2] = (trebleR * highC[biq_a2]) - (outSample * highC[biq_b2]);
highmidR = outSample; trebleR -= highmidR;
outSample = (highmidR * midC[biq_a0]) + midC[biq_sR1];
midC[biq_sR1] = (highmidR * midC[biq_a1]) - (outSample * midC[biq_b1]) + midC[biq_sR2];
midC[biq_sR2] = (highmidR * midC[biq_a2]) - (outSample * midC[biq_b2]);
lowmidR = outSample; highmidR -= lowmidR;
outSample = (lowmidR * lowC[biq_a0]) + lowC[biq_sR1];
lowC[biq_sR1] = (lowmidR * lowC[biq_a1]) - (outSample * lowC[biq_b1]) + lowC[biq_sR2];
lowC[biq_sR2] = (lowmidR * lowC[biq_a2]) - (outSample * lowC[biq_b2]);
bassR = outSample; lowmidR -= bassR;
trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
//third stage of three crossovers
highRIIR = (highRIIR*highCoef) + (trebleR*(1.0-highCoef));
highmidR = highRIIR; trebleR -= highmidR;
midRIIR = (midRIIR*midCoef) + (highmidR*(1.0-midCoef));
lowmidR = midRIIR; highmidR -= lowmidR;
lowRIIR = (lowRIIR*lowCoef) + (lowmidR*(1.0-lowCoef));
bassR = lowRIIR; lowmidR -= bassR;
inputSampleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
//fourth stage of three crossovers is the exponential filters
//begin 64 bit stereo floating point dither
//int expon; frexp((double)inputSampleL, &expon);
fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
//inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
//frexp((double)inputSampleR, &expon);
fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
//inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
//end 64 bit stereo floating point dither
*out1 = inputSampleL;
*out2 = inputSampleR;
in1++;
in2++;
out1++;
out2++;
}
}
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