project-kyoku/include/tools/bpmcalculator.h

#pragma once

#include "tools/music.h"
#include <memory>
#include <vector>

class BPMCalculator
{
public:
    explicit BPMCalculator(const std::shared_ptr<Music>& music);
    void setMusic(const std::shared_ptr<Music>& music);
    std::shared_ptr<Music> music() const;

    void start();

    void click();
    int getCurrentApproximation() const;

private:
    std::shared_ptr<Music> _music;
    std::vector<microsec> _deltas;
    microsec _previous_click_offset;
};