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#include "config.h"
#include "splitter.h"
#include <algorithm>
#include <cmath>
#include <limits>
#include "math_defs.h"
#include "opthelpers.h"
template<typename Real>
void BandSplitterR<Real>::init(Real f0norm)
{
const Real w{f0norm * al::MathDefs<Real>::Tau()};
const Real cw{std::cos(w)};
if(cw > std::numeric_limits<float>::epsilon())
mCoeff = (std::sin(w) - 1.0f) / cw;
else
mCoeff = cw * -0.5f;
mLpZ1 = 0.0f;
mLpZ2 = 0.0f;
mApZ1 = 0.0f;
}
template<typename Real>
void BandSplitterR<Real>::process(const al::span<const Real> input, Real *hpout, Real *lpout)
{
const Real ap_coeff{mCoeff};
const Real lp_coeff{mCoeff*0.5f + 0.5f};
Real lp_z1{mLpZ1};
Real lp_z2{mLpZ2};
Real ap_z1{mApZ1};
auto proc_sample = [ap_coeff,lp_coeff,&lp_z1,&lp_z2,&ap_z1,&lpout](const Real in) noexcept -> Real
{
/* Low-pass sample processing. */
Real d{(in - lp_z1) * lp_coeff};
Real lp_y{lp_z1 + d};
lp_z1 = lp_y + d;
d = (lp_y - lp_z2) * lp_coeff;
lp_y = lp_z2 + d;
lp_z2 = lp_y + d;
*(lpout++) = lp_y;
/* All-pass sample processing. */
Real ap_y{in*ap_coeff + ap_z1};
ap_z1 = in - ap_y*ap_coeff;
/* High-pass generated from removing low-passed output. */
return ap_y - lp_y;
};
std::transform(input.cbegin(), input.cend(), hpout, proc_sample);
mLpZ1 = lp_z1;
mLpZ2 = lp_z2;
mApZ1 = ap_z1;
}
template<typename Real>
void BandSplitterR<Real>::processHfScale(const al::span<Real> samples, const Real hfscale)
{
const Real ap_coeff{mCoeff};
const Real lp_coeff{mCoeff*0.5f + 0.5f};
Real lp_z1{mLpZ1};
Real lp_z2{mLpZ2};
Real ap_z1{mApZ1};
auto proc_sample = [hfscale,ap_coeff,lp_coeff,&lp_z1,&lp_z2,&ap_z1](const Real in) noexcept -> Real
{
/* Low-pass sample processing. */
Real d{(in - lp_z1) * lp_coeff};
Real lp_y{lp_z1 + d};
lp_z1 = lp_y + d;
d = (lp_y - lp_z2) * lp_coeff;
lp_y = lp_z2 + d;
lp_z2 = lp_y + d;
/* All-pass sample processing. */
Real ap_y{in*ap_coeff + ap_z1};
ap_z1 = in - ap_y*ap_coeff;
/* High-pass generated by removing the low-passed signal, which is then
* scaled and added back to the low-passed signal.
*/
return (ap_y-lp_y)*hfscale + lp_y;
};
std::transform(samples.begin(), samples.end(), samples.begin(), proc_sample);
mLpZ1 = lp_z1;
mLpZ2 = lp_z2;
mApZ1 = ap_z1;
}
template<typename Real>
void BandSplitterR<Real>::applyAllpass(const al::span<Real> samples) const
{
const Real coeff{mCoeff};
Real z1{0.0f};
auto proc_sample = [coeff,&z1](const Real in) noexcept -> Real
{
const Real out{in*coeff + z1};
z1 = in - out*coeff;
return out;
};
std::transform(samples.begin(), samples.end(), samples.begin(), proc_sample);
}
template class BandSplitterR<float>;
template class BandSplitterR<double>;
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