MusicScaleFilterBank.h

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//=====================================================================================
//=====================================================================================
#pragma once
namespace krotos
{
    class MusicScaleFilterBank
    {
      public:
        MusicScaleFilterBank(float sampleRate);
 
        void setSamplingRate(float fs);
 
        void setParameters(float fMin, float fMax, int numBandsPerOctave, int numFFTBins);
 
        std::vector<std::vector<float>> filterSpectrum(const std::vector<std::vector<float>>& spectrum);
 
      private:
        void musicScaleFilterUnrolled(std::vector<std::vector<float>>& filteredLogSpec,
                                      std::vector<std::vector<float>>& spectrum, int frame);
        void musicScaleFilterUnrolled96000(std::vector<std::vector<float>>& filteredLogSpec,
                                           const std::vector<std::vector<float>>& spectrum, int frame);
        void musicScaleFilterUnrolled48000(std::vector<std::vector<float>>& filteredLogSpec,
                                           const std::vector<std::vector<float>>& spectrum, int frame);
        void musicScaleFilterUnrolled44100(std::vector<std::vector<float>>& filteredLogSpec,
                                           const std::vector<std::vector<float>>& spectrum, int frame);
        void musicScaleFilterUnrolled22050(std::vector<std::vector<float>>& filteredLogSpec,
                                           const std::vector<std::vector<float>>& spectrum, int frame);
 
        void buildLogFreqAxis();
 
        std::vector<float> mapNotesToFFTBins();
 
        std::vector<std::vector<float>> buildFilterBank();
 
        std::vector<float> triangularFilterCoeff(float start, float mid, float stop);
 
        float m_maxFreq;
        float m_minFreq;
        int m_bandsPerOct;
        int m_numFFTBins{-1};
        int m_numBands{0};
 
        // Filerbank
        std::vector<std::vector<float>> m_filterBank;
 
        const float m_A4 = 440.0f;
        std::vector<float> m_freqLogAxis;
        float m_samplingRate{-1.0f};
        const float sr_441k = 44100.0f;
        const float sr_48k = 48000.0f;
        const float sr_96k = 96000.0f;
        const float sr_225k = 22050.0f;
    };
} // namespace krotos