pitch_detector.h

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/*
Summary:
The PitchDetector class attempts to find the fundamental period of a loaded signal using a method inspired by the YIN algorithm. By computing an error metric that measures how well the waveform repeats at different periods, it identifies a period length that best represents the fundamental frequency. This helps ensure that wavetables and other audio processing steps align wave cycles with their fundamental pitch.
 */
 
#pragma once
 
#include "JuceHeader.h"
 
class PitchDetector {
public:
    static constexpr int kNumPoints = 2520;
 
    PitchDetector();
 
    void setSize(int size) { size_ = size; }
 
    void loadSignal(const float* signal, int size);
 
    float getPeriodError(float period);
 
    float findYinPeriod(int max_period);
 
    float matchPeriod(int max_period);
 
    const float* data() const { return signal_data_.get(); }
 
protected:
    int size_;                                    
    std::unique_ptr<float[]> signal_data_;        
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PitchDetector)
};