FrequencySpectrumFactory.hpp

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#ifndef ECHOMAP_FREQUENCYSPECTRUMFACTORY_HPP
#define ECHOMAP_FREQUENCYSPECTRUMFACTORY_HPP
 
#include <memory>
#include <span>
 
#include "../FrequencySpectrum.hpp"
#include "../Signal.hpp"
 
namespace echomap
{
 
class FFTWBuffers;

class FrequencySpectrumFactory
{
public:
    [[nodiscard]] static std::unique_ptr<FrequencySpectrum> create_frequency_spectrum(
            const Signal& signal,
            WindowFunctions::AllFunctions window_function,
            std::size_t transform_size
    );
 
private:
    static float prepare_input(
            const FFTWBuffers& buffers,
            WindowFunctions::AllFunctions window_function,
            std::span<const Signal::Sample::AmplitudeT> input
    );

    [[nodiscard]] static Signal::Sample::AmplitudeT amplitude_to_dbfs(Signal::Sample::AmplitudeT amplitude) noexcept;
};
 
} // namespace echomap
 
#endif // ECHOMAP_FREQUENCYSPECTRUMFACTORY_HPP