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/*
* Copyright (c) 2020-2021 Vasile Vilvoiu <vasi@vilvoiu.ro>
*
* specgram is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#ifndef _WINDOW_FUNCTION_HPP_
#define _WINDOW_FUNCTION_HPP_
#include "input-parser.hpp"
#include <vector>
#include <complex>
#include <memory>
enum class WindowFunctionType {
kNone,
kHann,
kHamming,
kBlackman,
kNuttall
};
class WindowFunction {
protected:
const std::size_t window_size_;
std::vector<double> cached_factors_;
explicit WindowFunction(std::size_t window_size);
public:
WindowFunction() = delete;
ComplexWindow Apply(const ComplexWindow& window) const;
static std::unique_ptr<WindowFunction> FromType(WindowFunctionType type, std::size_t window_size);
};
class GeneralizedCosineWindowFunction : public WindowFunction {
protected:
public:
GeneralizedCosineWindowFunction(std::size_t window_size, const std::vector<double>& a);
};
class HannWindowFunction : public GeneralizedCosineWindowFunction {
public:
explicit HannWindowFunction(std::size_t window_size);
};
class HammingWindowFunction : public GeneralizedCosineWindowFunction {
public:
explicit HammingWindowFunction(std::size_t window_size);
};
class BlackmanWindowFunction : public GeneralizedCosineWindowFunction {
public:
explicit BlackmanWindowFunction(std::size_t window_size);
};
class NuttallWindowFunction : public GeneralizedCosineWindowFunction {
public:
explicit NuttallWindowFunction(std::size_t window_size);
};
#endif
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