signal_detector_cvf_impl.h

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/* -*- c++ -*- */
/*
 * Copyright 2019 Free Software Foundation Inc..
 *
 * This 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; either version 3, or (at your option)
 * any later version.
 *
 * This software 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef INCLUDED_INSPECTOR_SIGNAL_DETECTOR_CVF_IMPL_H
#define INCLUDED_INSPECTOR_SIGNAL_DETECTOR_CVF_IMPL_H

#include <gnuradio/fft/fft.h>
#include <gnuradio/filter/firdes.h>
#include <gnuradio/filter/single_pole_iir.h>
#include <inspector/signal_detector_cvf.h>
#include <fstream>

namespace gr {
namespace inspector {

class signal_detector_cvf_impl : public signal_detector_cvf
{
private:
    bool d_auto_threshold;
    int d_fft_len;
    unsigned int d_tmpbuflen;
    float d_threshold, d_sensitivity, d_average, d_quantization, d_min_bw;
    float *d_pxx, *d_tmp_pxx, *d_pxx_out, *d_tmpbuf;
    double d_samp_rate;
    std::ofstream logfile;

    std::vector<filter::single_pole_iir<float, float, double>> d_avg_filter;
    filter::firdes::win_type d_window_type;
    std::vector<float> d_window;
    std::vector<std::vector<float>> d_signal_edges;
    fft::fft_complex* d_fft;
    std::vector<float> d_freq;
    const char* d_filename;

    void write_logfile_header();
    void write_logfile_entry();

public:
    signal_detector_cvf_impl(double samp_rate,
                             int fft_len,
                             int window_type,
                             float threshold,
                             float sensitivity,
                             bool auto_threshold,
                             float average,
                             float quantization,
                             float min_bw,
                             const char* filename);

    ~signal_detector_cvf_impl();

    // set window coefficients
    void build_window();
    // create frequency vector
    std::vector<float> build_freq();
    // auto threshold calculation
    void build_threshold();
    // signal grouping logic
    std::vector<std::vector<unsigned int>> find_signal_edges();

    pmt::pmt_t pack_message();
    // check if signals have changed
    bool compare_signal_edges(std::vector<std::vector<float>>* edges);
    // PSD estimation
    void periodogram(float* pxx, const gr_complex* signal);

    int work(int noutput_items,
             gr_vector_const_void_star& input_items,
             gr_vector_void_star& output_items);

    void set_samp_rate(double d_samp_rate)
    {
        signal_detector_cvf_impl::d_samp_rate = d_samp_rate;
    }

    void set_fft_len(int fft_len);
    void set_window_type(int d_window);

    void set_threshold(float d_threshold)
    {
        signal_detector_cvf_impl::d_threshold = d_threshold;
    }

    void set_sensitivity(float d_sensitivity)
    {
        signal_detector_cvf_impl::d_sensitivity = d_sensitivity;
    }

    void set_auto_threshold(bool d_auto_threshold)
    {
        signal_detector_cvf_impl::d_auto_threshold = d_auto_threshold;
    }

    void set_average(float d_average)
    {
        signal_detector_cvf_impl::d_average = d_average;
        for (unsigned int i = 0; i < d_fft_len; i++) {
            d_avg_filter[i].set_taps(d_average);
        }
    }

    void set_quantization(float d_quantization)
    {
        signal_detector_cvf_impl::d_quantization = d_quantization;
    }
};

} // namespace inspector
} // namespace gr

#endif /* INCLUDED_INSPECTOR_SIGNAL_DETECTOR_CVF_IMPL_H */