sdrangel/sdrbase/dsp/fftcorr.h

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2018-2020 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
// //
// FFT based cross correlation. Uses FFTW/Kiss engine. //
// //
// 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 SDRBASE_DSP_FFTCORR2_H_
#define SDRBASE_DSP_FFTCORR2_H_
#include <complex>
#include "dsp/fftwindow.h"
#include "export.h"
class FFTEngine;
class SDRBASE_API fftcorr {
public:
typedef std::complex<float> cmplx;
fftcorr(int len);
~fftcorr();
int run(const cmplx& inA, const cmplx* inB, cmplx **out); //!< if inB = 0 then run auto-correlation
const cmplx& run(const cmplx& inA, const cmplx* inB);
private:
void init_fft();
int flen; //!< FFT length
int flen2; //!< half FFT length
FFTEngine *fftA;
FFTEngine *fftB;
FFTEngine *fftInvA;
unsigned int fftASequence;
unsigned int fftBSequence;
unsigned int fftInvASequence;
FFTWindow m_window;
cmplx *dataA; // from A input
cmplx *dataB; // from B input
cmplx *dataBj; // conjugate of B
cmplx *dataP; // product of A with conjugate of B
int inptrA;
int inptrB;
int outptr;
};
#endif /* SDRBASE_DSP_FFTCORR2_H_ */