mirror of https://github.com/gnss-sdr/gnss-sdr
502 lines
22 KiB
C++
502 lines
22 KiB
C++
/*!
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* \file labsat23_source.cc
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*
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* \brief Unpacks the Labsat 2 (ls2) and (ls3) capture files
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* \author Javier Arribas jarribas (at) cttc.es
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* GNSS-SDR 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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* GNSS-SDR 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 GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#include "labsat23_source.h"
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#include <gnuradio/io_signature.h>
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#include <exception>
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#include <iostream>
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#include <sstream>
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labsat23_source_sptr labsat23_make_source(const char *signal_file_basename, int channel_selector)
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{
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return labsat23_source_sptr(new labsat23_source(signal_file_basename, channel_selector));
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}
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std::string labsat23_source::generate_filename()
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{
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std::ostringstream ss;
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ss << std::setw(4) << std::setfill('0') << d_current_file_number;
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return d_signal_file_basename + "_" + ss.str() + ".LS3";
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}
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labsat23_source::labsat23_source(const char *signal_file_basename,
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int channel_selector) : gr::block("labsat23_source",
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(1, 1, sizeof(gr_complex)))
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{
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if (channel_selector < 1 or channel_selector > 2)
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{
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std::cout << "Labsat source config error: channel selection out of bounds, check gnss-sdr config file" << std::endl;
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exit(1);
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}
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d_channel_selector_config = channel_selector;
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d_header_parsed = false;
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d_bits_per_sample = 0;
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d_current_file_number = 0;
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d_labsat_version = 0;
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d_ref_clock = 0;
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d_channel_selector = 0;
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d_signal_file_basename = std::string(signal_file_basename);
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std::string signal_file;
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this->set_output_multiple(8);
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signal_file = generate_filename();
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binary_input_file = new std::ifstream(signal_file.c_str(), std::ios::in | std::ios::binary);
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if (binary_input_file->is_open())
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{
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std::cout << "Labsat file source is reading samples from " << signal_file << std::endl;
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}
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else
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{
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std::cout << "Labsat file " << signal_file << " could not be opened!" << std::endl;
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delete binary_input_file;
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exit(1);
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}
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}
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labsat23_source::~labsat23_source()
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{
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try
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{
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if (binary_input_file->is_open())
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{
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binary_input_file->close();
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}
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}
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catch (const std::ifstream::failure &e)
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{
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std::cerr << "Problem closing input file" << '\n';
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}
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catch (const std::exception &e)
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{
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std::cerr << e.what() << '\n';
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}
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delete binary_input_file;
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}
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int labsat23_source::getBit(uint8_t byte, int position)
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{
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return (byte >> position) & 0x01;
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}
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void labsat23_source::decode_samples_one_channel(int16_t input_short, gr_complex *out, int type)
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{
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std::bitset<16> bs(input_short);
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switch (type)
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{
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case 2:
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//two bits per sample, 8 samples per int16
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for (int i = 0; i < 8; i++)
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{
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out[i] = gr_complex(static_cast<float>(bs[15 - (2 * i)]),
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static_cast<float>(bs[14 - (2 * i)]));
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out[i] = out[i] * gr_complex(2, 0) - gr_complex(1, 1);
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}
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break;
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case 4:
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//four bits per sample, 4 samples per int16
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for (int i = 0; i < 4; i++)
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{
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out[i] = gr_complex(0.0, 0.0);
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//In-Phase
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if (bs[15 - 4 * i])
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{
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if (bs[13 - 4 * i]) //11
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{
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out[i] += gr_complex(-1, 0);
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}
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else //10
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{
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out[i] += gr_complex(-2, 0);
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}
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}
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else
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{
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if (bs[13 - 4 * i]) //01
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{
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out[i] += gr_complex(1, 0);
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}
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}
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//Quadrature
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if (bs[14 - 4 * i])
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{
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if (bs[12 - 4 * i]) //11
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{
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out[i] += gr_complex(0, -1);
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}
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else //10
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{
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out[i] += gr_complex(0, -2);
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}
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}
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else
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{
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if (bs[12 - 4 * i]) //01
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{
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out[i] += gr_complex(0, 1);
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}
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}
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out[i] += gr_complex(0.5, 0.5);
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}
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break;
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}
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}
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int labsat23_source::general_work(int noutput_items,
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__attribute__((unused)) gr_vector_int &ninput_items,
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__attribute__((unused)) gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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{
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auto *out = reinterpret_cast<gr_complex *>(output_items[0]);
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if (d_header_parsed == false)
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{
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if (binary_input_file->eof() == false)
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{
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char memblock[1024];
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binary_input_file->read(memblock, 1024);
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//parse Labsat header
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//check preamble
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int byte_counter = 0;
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bool preamble_ok = true;
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for (int i = 0; i < 8; i++)
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{
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if (memblock[byte_counter] != 0x00)
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{
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preamble_ok = false;
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}
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//std::cout << "H[" << i << "]:" << (int)memblock[byte_counter] << std::endl;
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byte_counter++;
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}
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if (preamble_ok == false)
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{
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std::cout << "Labsat source do not detect the preamble in the selected file" << std::endl;
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return -1;
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}
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// check Labsat version
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if (memblock[byte_counter] == 0x4C and memblock[byte_counter + 1] == 0x53 and memblock[byte_counter + 2] == 0x32)
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{
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d_labsat_version = 2;
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std::cout << "Labsat file version 2 detected" << std::endl;
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}
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if (memblock[byte_counter] == 0x4C and memblock[byte_counter + 1] == 0x53 and memblock[byte_counter + 2] == 0x33)
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{
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d_labsat_version = 3;
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std::cout << "Labsat file version 3 detected" << std::endl;
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}
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if (d_labsat_version == 0)
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{
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std::cout << "Labsat source do not detect the labsat version in file header" << std::endl;
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return -1;
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}
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byte_counter += 3;
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int sub_version = static_cast<int>(memblock[byte_counter]);
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std::cout << "Labsat file sub version " << sub_version << std::endl;
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byte_counter++;
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int header_bytes = 0;
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header_bytes += memblock[byte_counter] | (memblock[byte_counter + 1] << 8) | (memblock[byte_counter + 2] << 16) | (memblock[byte_counter + 3] << 24);
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byte_counter += 4;
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//std::cout << "header_bytes=" << header_bytes << std::endl;
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// read first section
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// section ID (little-endian)
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uint8_t section_id = static_cast<int>(memblock[byte_counter]) + static_cast<int>(memblock[byte_counter + 1]) * 256;
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//std::cout << "Section ID: " << (int)section_id << std::endl;
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byte_counter += 2;
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//uint8_t section_lenght_bytes = 0;
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//section_lenght_bytes += memblock[byte_counter] | (memblock[byte_counter + 1] << 8) | (memblock[byte_counter + 2] << 16) | (memblock[byte_counter + 3] << 24);
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//std::cout << "section_lenght_bytes=" << (int)section_lenght_bytes << std::endl;
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byte_counter += 4;
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if (section_id == 2)
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{
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d_ref_clock = static_cast<uint8_t>(memblock[byte_counter]);
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switch (d_ref_clock)
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{
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case 0:
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std::cout << "Labsat reference clock: internal OXCO" << std::endl;
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break;
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case 1:
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std::cout << "Labsat reference clock: internal TXCO" << std::endl;
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break;
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case 2:
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std::cout << "Labsat reference clock: external 10 MHz" << std::endl;
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break;
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case 3:
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std::cout << "Labsat reference clock: external 16.386 MHz" << std::endl;
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break;
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default:
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std::cout << "Labsat Unknown reference clock ID " << static_cast<int>(d_ref_clock) << std::endl;
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}
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byte_counter++;
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d_bits_per_sample = static_cast<uint8_t>(memblock[byte_counter]);
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switch (d_bits_per_sample)
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{
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case 2:
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std::cout << "Labsat is using 2 bits per sample" << std::endl;
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break;
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case 4:
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std::cout << "Labsat is using 4 bits per sample" << std::endl;
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break;
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default:
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std::cout << "Labsat Unknown bits per sample ID " << static_cast<int>(d_bits_per_sample) << std::endl;
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return -1;
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}
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byte_counter++;
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d_channel_selector = static_cast<uint8_t>(memblock[byte_counter]);
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switch (d_channel_selector)
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{
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case 0:
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std::cout << "Available channels: Channel A + B, 1 bit quantisation" << std::endl;
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break;
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case 1:
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std::cout << "Available channels: Channel A, 1 bit quantisation" << std::endl;
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break;
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case 2:
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std::cout << "Available channels: Channel B, 1 bit quantisation" << std::endl;
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break;
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case 3:
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std::cout << "Available channels: Channel A, 2 bit quantisation" << std::endl;
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break;
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case 4:
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std::cout << "Available channels: Channel B, 2 bit quantisation" << std::endl;
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break;
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default:
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std::cout << "Unknown channel selection ID " << static_cast<int>(d_channel_selector) << std::endl;
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return -1;
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}
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// check if the selected channel in config file match the file encoding
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if (d_channel_selector_config == 2 and d_channel_selector != 0)
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{
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std::cout << "Labsat source channel config inconsistency: channel 2 is selected but the file has only one channel" << std::endl;
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return -1;
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}
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//todo: Add support for dual channel files
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if (d_channel_selector == 0)
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{
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std::cout << "ERROR: Labsat file contains more than one channel and it is not currently supported by Labsat signal source." << std::endl;
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return -1;
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}
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byte_counter++;
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auto quantization = static_cast<uint8_t>(memblock[byte_counter]);
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switch (quantization)
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{
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case 1:
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std::cout << "1 bit per sample" << std::endl;
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break;
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case 2:
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std::cout << "2 bit per sample" << std::endl;
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break;
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default:
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std::cout << "Unknown quantization ID " << static_cast<int>(quantization) << std::endl;
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}
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byte_counter++;
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auto channel_a_constellation = static_cast<uint8_t>(memblock[byte_counter]);
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switch (channel_a_constellation)
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{
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case 0:
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std::cout << "Labsat Channel A is GPS" << std::endl;
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break;
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case 1:
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std::cout << "Labsat Channel A is GLONASS" << std::endl;
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break;
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case 2:
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std::cout << "Labsat Channel A is BDS" << std::endl;
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break;
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default:
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std::cout << "Unknown channel A constellation ID " << static_cast<int>(channel_a_constellation) << std::endl;
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}
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byte_counter++;
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auto channel_b_constellation = static_cast<uint8_t>(memblock[byte_counter]);
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switch (channel_b_constellation)
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{
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case 0:
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std::cout << "Labsat Channel B is GPS" << std::endl;
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break;
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case 1:
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std::cout << "Labsat Channel B is GLONASS" << std::endl;
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break;
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case 2:
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std::cout << "Labsat Channel B is BDS" << std::endl;
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break;
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default:
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std::cout << "Unknown channel B constellation ID " << static_cast<int>(channel_b_constellation) << std::endl;
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}
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// end of header
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d_header_parsed = true;
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// seek file to the first signal sample
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binary_input_file->clear();
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binary_input_file->seekg(header_bytes, binary_input_file->beg);
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return 0;
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}
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std::cout << "Labsat file header error: section 2 is not available." << std::endl;
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return -1;
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}
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std::cout << "Labsat file read error: file is empty." << std::endl;
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return -1;
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}
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// ready to start reading samples
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switch (d_bits_per_sample)
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{
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case 2:
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{
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switch (d_channel_selector)
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{
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case 0:
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// dual channel 2 bits per complex sample
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break;
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default:
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// single channel 2 bits per complex sample (1 bit I + 1 bit Q, 8 samples per int16)
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int n_int16_to_read = noutput_items / 8;
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if (n_int16_to_read > 0)
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{
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int16_t memblock[n_int16_to_read];
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binary_input_file->read(reinterpret_cast<char *>(memblock), n_int16_to_read * 2);
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n_int16_to_read = binary_input_file->gcount() / 2; //from bytes to int16
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if (n_int16_to_read > 0)
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{
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int output_pointer = 0;
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for (int i = 0; i < n_int16_to_read; i++)
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{
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decode_samples_one_channel(memblock[i], &out[output_pointer], d_bits_per_sample);
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output_pointer += 8;
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}
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return output_pointer;
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}
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// trigger the read of the next file in the sequence
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std::cout << "End of current file, reading the next Labsat file in sequence: " << generate_filename() << std::endl;
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d_current_file_number++;
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binary_input_file->close();
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binary_input_file->open(generate_filename().c_str(), std::ios::in | std::ios::binary);
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if (binary_input_file->is_open())
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{
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std::cout << "Labsat file source is reading samples from " << generate_filename() << std::endl;
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}
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else
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{
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std::cout << "Last file reached, LabSat source stop" << std::endl;
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return -1;
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}
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}
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else
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{
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return 0;
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}
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};
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break;
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}
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case 4:
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{
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switch (d_channel_selector)
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{
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case 0:
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// dual channel
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break;
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default:
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// single channel 4 bits per complex sample (2 bit I + 2 bit Q, 4 samples per int16)
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int n_int16_to_read = noutput_items / 4;
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if (n_int16_to_read > 0)
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{
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int16_t memblock[n_int16_to_read];
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binary_input_file->read(reinterpret_cast<char *>(memblock), n_int16_to_read * 2);
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n_int16_to_read = binary_input_file->gcount() / 2; //from bytes to int16
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if (n_int16_to_read > 0)
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{
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int output_pointer = 0;
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for (int i = 0; i < n_int16_to_read; i++)
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{
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decode_samples_one_channel(memblock[i], &out[output_pointer], d_bits_per_sample);
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output_pointer += 4;
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}
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return output_pointer;
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}
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// trigger the read of the next file in the sequence
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std::cout << "End of current file, reading the next Labsat file in sequence: " << generate_filename() << std::endl;
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d_current_file_number++;
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binary_input_file->close();
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binary_input_file->open(generate_filename().c_str(), std::ios::in | std::ios::binary);
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if (binary_input_file->is_open())
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{
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std::cout << "Labsat file source is reading samples from " << generate_filename() << std::endl;
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}
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else
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{
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std::cout << "Last file reached, LabSat source stop" << std::endl;
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return -1;
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}
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}
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else
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{
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return 0;
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}
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}
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break;
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}
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default:
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{
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return -1;
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}
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}
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std::cout << "Warning!!" << std::endl;
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return 0;
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}
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