qo100-trx-prototypes/blocks/fft-beacon-finder.h

#ifndef _FFT_BEACON_FINDER_
#define _FFT_BEACON_FINDER_

#include <complex>

#include <liquid/liquid.h>

const size_t FFT_LEN = 512;

class FFTBeaconFinder {
    private:
        int samplingrate;

        nco_crcf coarse_correction;
        fftplan fft;

        std::complex<float> fft_in[FFT_LEN];
        std::complex<float> fft_out[FFT_LEN];

        size_t pos;
        int next_fft_in;

        int last_center;
        float last_center_level;

        bool has_sync;

        int spectral_bin_to_fft_idx(int);

    public:
        FFTBeaconFinder(int);
        ~FFTBeaconFinder();

        void reset_sync();

        std::complex<float> work(std::complex<float>);
};

#endif