DiscreteCosineTransform.h

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#pragma once
 
#include <cmath>
#include <cstddef>
#include <vector>
 
namespace krotos
{
    class DiscreteCosineTransform
    {
 
      public:
        DiscreteCosineTransform();
 
        void setInputOutputSize(const std::size_t& inputSize, const std::size_t& outputSize);
 
        std::vector<float> calculateDCT(const std::vector<float>& input);
 
        void buildDctMatrix(const std::size_t& inputSize, const std::size_t& outputSize);
 
      private:
        float m_pi = 3.141592653589793238f;
        std::size_t m_inputSize = 0;
        std::size_t m_outputSize = 0;
 
        std::vector<std::vector<float>> m_dctMatrix;
    };
} // namespace krotos