interpolator.hpp

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#pragma once
 
#include "tabulasonora/table_set.hpp"
 
#include <cstdint>
#include <span>
#include <utility>
 
namespace ts {

class Interpolator {
public:
    static constexpr int phase_count = 128;

    static constexpr int tap_count = 4;

    explicit Interpolator(const TableSet& tables) : coefficients_(tables.interp_coef()) {}

    [[nodiscard]] float sample(std::span<const float> buffer, double position) const noexcept;

    [[nodiscard]] float
    sample_ring(std::span<const float> ring, std::int64_t index, double fraction) const noexcept;

    void resample(std::span<const float> buffer,
                  std::span<const double> positions,
                  std::span<float> destination) const noexcept;
 
private:
    std::span<const float> coefficients_;
};

class PanLaw {
public:
    static constexpr int centre = 64;

    explicit PanLaw(const TableSet& tables) : table_(tables.pan()) {}

    [[nodiscard]] std::pair<double, double> gains(int pan) const noexcept;
 
private:
    std::span<const std::uint8_t> table_;
};
 
} // namespace ts