sdrangel/ft8/fft.h

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2018-2020, 2023 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
// //
// This is the code from ft8mon: https://github.com/rtmrtmrtmrtm/ft8mon //
// reformatted and adapted to Qt and SDRangel context //
// //
// Caution: this is intentionally not thread safe and one such engine should //
// be allocated by thread. Due to optimization of FFT buffers these buffers are //
// not shared among threads. //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#ifndef FFT_H
#define FFT_H
#include <QMutex>
#include <vector>
#include <complex>
#include "export.h"
namespace FT8
{
class FFTBuffers;
class FT8_API FFTEngine
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{
public:
std::vector<std::complex<float>> one_fft(const std::vector<float> &samples, int i0, int block);
std::vector<float> one_ifft(const std::vector<std::complex<float>> &bins);
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typedef std::vector<std::vector<std::complex<float>>> ffts_t;
ffts_t ffts(const std::vector<float> &samples, int i0, int block);
std::vector<std::complex<float>> one_fft_c(const std::vector<float> &samples, int i0, int block);
std::vector<std::complex<float>> one_fft_cc(const std::vector<std::complex<float>> &samples, int i0, int block);
std::vector<std::complex<float>> one_ifft_cc(const std::vector<std::complex<float>> &bins);
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std::vector<float> hilbert_shift(const std::vector<float> &x, float hz0, float hz1, int rate);
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FFTEngine();
~FFTEngine();
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private:
std::vector<std::complex<float>> analytic(const std::vector<float> &x);
FFTBuffers *m_fftBuffers;
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}; // FFTEngine
} // namespace FT8
#endif