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#ifndef FILTER_SPLITTER_H
#define FILTER_SPLITTER_H
#include <cstddef>
#include "alspan.h"
/* Band splitter. Splits a signal into two phase-matching frequency bands. */
template<typename Real>
class BandSplitterR {
Real mCoeff{0.0f};
Real mLpZ1{0.0f};
Real mLpZ2{0.0f};
Real mApZ1{0.0f};
public:
BandSplitterR() = default;
BandSplitterR(const BandSplitterR&) = default;
BandSplitterR(Real f0norm) { init(f0norm); }
void init(Real f0norm);
void clear() noexcept { mLpZ1 = mLpZ2 = mApZ1 = 0.0f; }
void process(const al::span<const Real> input, Real *hpout, Real *lpout);
void processHfScale(const al::span<Real> samples, const Real hfscale);
/* The all-pass portion of the band splitter. Applies the same phase shift
* without splitting the signal. Note that each use of this method is
* indepedent, it does not track history between calls.
*/
void applyAllpass(const al::span<Real> samples) const;
};
using BandSplitter = BandSplitterR<float>;
#endif /* FILTER_SPLITTER_H */
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