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41 lines
923 B
C++
41 lines
923 B
C++
#pragma once
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#include "tools/music.h"
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#include <memory>
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#include <vector>
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class BPMCalculator
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{
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public:
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explicit BPMCalculator(const std::shared_ptr<Music>& music);
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void setMusic(const std::shared_ptr<Music>& music);
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std::shared_ptr<Music> music() const;
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void start();
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void stop();
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void click();
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float fetchCurrentBPMApproximation();
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microsec getStartingOffset() const;
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void setStartingOffset(microsec offset);
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void moveStartingOffsetBy(microsec shift);
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microsec fetchTimeUntilNextBeat();
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microsec fetchBeatInterval();
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private:
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bool _need_recalculate;
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bool _calculating;
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std::shared_ptr<Music> _music;
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std::vector<microsec> _deltas;
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microsec _previous_click_offset;
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microsec _first_click_offset;
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int _approximated_bpm;
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inline float calculateBPM(microsec all_microseconds, std::size_t beats_amount) const;
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inline void reset();
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};
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