FrequencyDomainAnalysisFramework.h

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//=====================================================================================
//=====================================================================================
 
#pragma once
 
#include <vector>
#include <cmath>
 
//=====================================================================================
namespace krotos
{
    class FrequencyDomainAnalysisFramework
    {
      public:
        //=====================================================================================
        FrequencyDomainAnalysisFramework(int analysisFrameSize, int sampleRate);
 
        //=====================================================================================
        // Mutators
 
        void setSamplingFrequency(int fs);
 
        void setNumberOfMelFrequencyCoefficients(int numCoeffs);
 
        void setNumberOfMelFrequencyCepstralCoefficients(int numCoeffs);
 
        void setFrequencyVector(const std::vector<float>& freqVector);
 
        //=====================================================================================
        // Accessors
 
        int getSamplingFrequency();
 
        int getNumberOfMelFrequencyCepstralCoefficients();
 
        //=====================================================================================
        void setSpectralFrame(std::vector<float> spectralFrame);
 
        //=====================================================================================
        // Spectra
        float getFreqOfLoudestPartial();
 
        std::vector<float> getMelSpectrum();
 
        std::vector<float> getMFCC();
 
        //=====================================================================================
        // Frequency-domain features
 
        float getSpectralCentroid();
 
        float getSpectralFlatness();
 
        float getSpectralRolloff();
 
        float getSpectralSpread();
 
        float getSpectralSlope();
 
        float getSpectralFlux();
 
        float getSpectralKurtosis();
 
        float getFrameEnergy();
 
        float getHighFreqencyContentOnsetDectionFunction();
 
        /*Gonna be uncommented once we find a use for the complex fft.So far all
        we are doing is using magnitude spectrum values so this would not work.Not
        needed for now though*/
        float getComplexSpectralDifference();
 
      private:
        void initialiseSpectralAnalysisAlgorithms();
 
        float calculateSpectralMoment(int n);
 
        int m_samplingFrequency{-1};
 
        std::vector<float> m_spectralFrame;
        int m_spectralFrameSize{-1};
        std::vector<float> m_freqVector;
 
        std::vector<float> m_prevMagSpecSpectralFlux;
 
        std::vector<float> m_prevMagSpecCSD;
        std::vector<float> m_prevPhase1CSD;
        std::vector<float> m_prevPhase2CSD;
 
        MelFrequencySpectrum m_melFrequencySpectrum;
        DiscreteCosineTransform m_dct;
 
        int m_numMelCoefficients;
        int m_numMelCepstralCoefficients;
        std::vector<float> m_windowing;
    };
} // namespace krotos