leq.hpp

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#ifndef EDSP_LEQ_HPP
#define EDSP_LEQ_HPP

#include <edsp/filter/moving_average_filter.hpp>
#include <edsp/feature/temporal/energy.hpp>
#include <edsp/converter/pow2db.hpp>

namespace edsp { namespace feature { inline namespace temporal {

    template <typename T>
    struct leq {
        using size_type = std::size_t;
        using value_type = T;

        inline explicit leq(size_type number_frames);

        ~leq() = default;
        
        template <typename ForwardIt>
        inline value_type extract(ForwardIt first, ForwardIt last);

    private:
        filter::moving_average<T> filter;
    };

    template<typename T>
    inline leq<T>::leq(leq::size_type number_frames) :
        filter(number_frames) {

    }

    template<typename T>
    template<typename ForwardIt>
    inline typename leq<T>::value_type leq<T>::extract(ForwardIt first, ForwardIt last) {
        const auto e      = energy(first, last);
        const auto energy_mean = filter.tick(e);
        return converter::pow2db(energy_mean);
    }

}}}

#endif //EDSP_LEQ_HPP