108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
/* -*- c++ -*- */
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/*
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* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
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*
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* Copyright (C) 2017,2019 Libre Space Foundation <http://libre.space>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_SATNOGS_WATERFALL_SINK_IMPL_H
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#define INCLUDED_SATNOGS_WATERFALL_SINK_IMPL_H
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#include <satnogs/waterfall_sink.h>
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#include <volk/volk.h>
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#include <gnuradio/fft/fft.h>
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#include <iostream>
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#include <fstream>
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#include <chrono>
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namespace gr {
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namespace satnogs {
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class waterfall_sink_impl : public waterfall_sink {
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private:
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/**
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* Waterfall header data.
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* This structure is only for readability purposes and make more clear to
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* possible users the structure of the header.
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*/
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typedef struct {
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char start_time[32]; /**< String with the start of the waterfall in ISO-8601 format */
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uint32_t samp_rate; /**< The sampling rate of the waterfall */
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uint32_t fft_size; /**< The FFT size of the flowgraph */
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uint32_t nfft_per_row; /**< The number of FFTs performed to plot one row */
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float center_freq; /**< The center frequency of the observation. Just for viasualization purposes */
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uint32_t endianness; /**< The endianness of the rest of the file. Should be 0 for big endian */
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} header_t;
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/**
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* The different types of operation of the waterfall
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*/
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typedef enum {
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WATERFALL_MODE_DECIMATION = 0,//!< WATERFALL_MODE_DECIMATION Performs just a decimation and computes the energy only
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WATERFALL_MODE_MAX_HOLD = 1, //!< WATERFALL_MODE_MAX_HOLD compute the max hold energy of all the FFT snapshots between two consecutive pixel rows
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WATERFALL_MODE_MEAN = 2 //!< WATERFALL_MODE_MEAN compute the mean energy of all the FFT snapshots between two consecutive pixel rows
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} wf_mode_t;
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const float d_samp_rate;
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const float d_center_freq;
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const size_t d_fft_size;
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wf_mode_t d_mode;
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size_t d_refresh;
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size_t d_fft_cnt;
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size_t d_fft_shift;
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size_t d_samples_cnt;
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fft::fft_complex d_fft;
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gr_complex *d_shift_buffer;
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float *d_hold_buffer;
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float *d_tmp_buffer;
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std::ofstream d_fos;
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std::chrono::system_clock::time_point d_start;
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void
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apply_header();
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void
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write_timestamp();
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public:
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waterfall_sink_impl(float samp_rate, float center_freq, float rps,
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size_t fft_size, const std::string &filename, int mode);
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~waterfall_sink_impl();
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bool
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start();
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int
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work(int noutput_items, gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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void
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compute_decimation(const gr_complex *in, size_t n_fft);
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void
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compute_max_hold(const gr_complex *in, size_t n_fft);
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void
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compute_mean(const gr_complex *in, size_t n_fft);
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};
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} // namespace satnogs
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} // namespace gr
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#endif /* INCLUDED_SATNOGS_WATERFALL_SINK_IMPL_H */
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