🛠️🐜 Antkeeper superbuild with dependencies included
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132 lines
3.4 KiB
132 lines
3.4 KiB
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#include "config.h"
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#include "splitter.h"
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#include <cmath>
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#include <limits>
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#include <algorithm>
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#include "math_defs.h"
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template<typename Real>
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void BandSplitterR<Real>::init(Real f0norm)
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{
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const Real w{f0norm * al::MathDefs<Real>::Tau()};
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const Real cw{std::cos(w)};
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if(cw > std::numeric_limits<float>::epsilon())
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coeff = (std::sin(w) - 1.0f) / cw;
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else
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coeff = cw * -0.5f;
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lp_z1 = 0.0f;
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lp_z2 = 0.0f;
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ap_z1 = 0.0f;
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}
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template<typename Real>
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void BandSplitterR<Real>::process(Real *hpout, Real *lpout, const Real *input, const int count)
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{
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ASSUME(count > 0);
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const Real ap_coeff{this->coeff};
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const Real lp_coeff{this->coeff*0.5f + 0.5f};
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Real lp_z1{this->lp_z1};
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Real lp_z2{this->lp_z2};
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Real ap_z1{this->ap_z1};
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auto proc_sample = [ap_coeff,lp_coeff,&lp_z1,&lp_z2,&ap_z1,&lpout](const Real in) noexcept -> Real
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{
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/* Low-pass sample processing. */
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Real d{(in - lp_z1) * lp_coeff};
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Real lp_y{lp_z1 + d};
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lp_z1 = lp_y + d;
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d = (lp_y - lp_z2) * lp_coeff;
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lp_y = lp_z2 + d;
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lp_z2 = lp_y + d;
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*(lpout++) = lp_y;
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/* All-pass sample processing. */
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Real ap_y{in*ap_coeff + ap_z1};
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ap_z1 = in - ap_y*ap_coeff;
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/* High-pass generated from removing low-passed output. */
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return ap_y - lp_y;
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};
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std::transform(input, input+count, hpout, proc_sample);
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this->lp_z1 = lp_z1;
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this->lp_z2 = lp_z2;
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this->ap_z1 = ap_z1;
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}
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template<typename Real>
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void BandSplitterR<Real>::applyHfScale(Real *samples, const Real hfscale, const int count)
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{
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ASSUME(count > 0);
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const Real ap_coeff{this->coeff};
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const Real lp_coeff{this->coeff*0.5f + 0.5f};
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Real lp_z1{this->lp_z1};
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Real lp_z2{this->lp_z2};
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Real ap_z1{this->ap_z1};
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auto proc_sample = [hfscale,ap_coeff,lp_coeff,&lp_z1,&lp_z2,&ap_z1](const Real in) noexcept -> Real
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{
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/* Low-pass sample processing. */
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Real d{(in - lp_z1) * lp_coeff};
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Real lp_y{lp_z1 + d};
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lp_z1 = lp_y + d;
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d = (lp_y - lp_z2) * lp_coeff;
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lp_y = lp_z2 + d;
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lp_z2 = lp_y + d;
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/* All-pass sample processing. */
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Real ap_y{in*ap_coeff + ap_z1};
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ap_z1 = in - ap_y*ap_coeff;
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/* High-pass generated from removing low-passed output. */
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return (ap_y-lp_y)*hfscale + lp_y;
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};
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std::transform(samples, samples+count, samples, proc_sample);
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this->lp_z1 = lp_z1;
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this->lp_z2 = lp_z2;
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this->ap_z1 = ap_z1;
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}
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template class BandSplitterR<float>;
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template class BandSplitterR<double>;
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template<typename Real>
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void SplitterAllpassR<Real>::init(Real f0norm)
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{
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const Real w{f0norm * al::MathDefs<Real>::Tau()};
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const Real cw{std::cos(w)};
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if(cw > std::numeric_limits<float>::epsilon())
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coeff = (std::sin(w) - 1.0f) / cw;
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else
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coeff = cw * -0.5f;
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z1 = 0.0f;
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}
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template<typename Real>
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void SplitterAllpassR<Real>::process(Real *samples, int count)
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{
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ASSUME(count > 0);
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const Real coeff{this->coeff};
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Real z1{this->z1};
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auto proc_sample = [coeff,&z1](const Real in) noexcept -> Real
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{
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const Real out{in*coeff + z1};
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z1 = in - out*coeff;
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return out;
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};
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std::transform(samples, samples+count, samples, proc_sample);
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this->z1 = z1;
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}
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template class SplitterAllpassR<float>;
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template class SplitterAllpassR<double>;
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