mirror of https://github.com/gnss-sdr/gnss-sdr
330 lines
12 KiB
C++
330 lines
12 KiB
C++
/*!
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* \file two_bit_packed_file_signal_source.cc
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* \brief Interface of a class that reads signals samples from a file. Each
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* sample is two bits, which are packed into bytes or shorts.
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*
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* \author Cillian O'Driscoll, 2015 cillian.odriscoll (at) gmail.com
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2019 (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 "two_bit_packed_file_signal_source.h"
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#include "configuration_interface.h"
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#include "gnss_sdr_flags.h"
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#include "gnss_sdr_valve.h"
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#include <glog/logging.h>
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#include <gnuradio/blocks/char_to_float.h>
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#include <exception>
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#include <fstream>
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#include <iomanip>
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#include <iostream>
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#include <utility>
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TwoBitPackedFileSignalSource::TwoBitPackedFileSignalSource(ConfigurationInterface* configuration,
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const std::string& role,
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unsigned int in_streams,
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unsigned int out_streams,
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const std::shared_ptr<Concurrent_Queue<pmt::pmt_t>>& queue) : role_(role),
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in_streams_(in_streams),
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out_streams_(out_streams),
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queue_(std::move(queue))
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{
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std::string default_filename = "../data/my_capture.dat";
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std::string default_item_type = "byte";
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std::string default_dump_filename = "../data/my_capture_dump.dat";
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std::string default_sample_type = "real";
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double default_seconds_to_skip = 0.0;
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samples_ = configuration->property(role + ".samples", 0);
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sampling_frequency_ = configuration->property(role + ".sampling_frequency", 0);
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filename_ = configuration->property(role + ".filename", default_filename);
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// override value with commandline flag, if present
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if (FLAGS_signal_source != "-")
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{
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filename_ = FLAGS_signal_source;
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}
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if (FLAGS_s != "-")
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{
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filename_ = FLAGS_s;
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}
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item_type_ = configuration->property(role + ".item_type", default_item_type);
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big_endian_items_ = configuration->property(role + ".big_endian_items", true);
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big_endian_bytes_ = configuration->property(role + ".big_endian_bytes", false);
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sample_type_ = configuration->property(role + ".sample_type", default_sample_type); // options: "real", "iq", "qi"
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repeat_ = configuration->property(role + ".repeat", false);
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dump_ = configuration->property(role + ".dump", false);
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dump_filename_ = configuration->property(role + ".dump_filename", default_dump_filename);
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enable_throttle_control_ = configuration->property(role + ".enable_throttle_control", false);
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double seconds_to_skip = configuration->property(role + ".seconds_to_skip", default_seconds_to_skip);
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int64_t bytes_to_skip = 0;
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if (item_type_ == "byte")
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{
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item_size_ = sizeof(char);
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}
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else if (item_type_ == "short")
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{
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// If we have shorts stored in little endian format, might as
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// well read them in as bytes.
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if (big_endian_items_)
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{
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item_size_ = sizeof(int16_t);
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}
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else
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{
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item_size_ = sizeof(char);
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}
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}
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else
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{
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LOG(WARNING) << item_type_ << " unrecognized item type. Using byte.";
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item_size_ = sizeof(char);
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}
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if (sample_type_ == "real")
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{
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is_complex_ = false;
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}
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else if (sample_type_ == "iq")
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{
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is_complex_ = true;
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reverse_interleaving_ = false;
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}
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else if (sample_type_ == "qi")
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{
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is_complex_ = true;
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reverse_interleaving_ = true;
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}
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else
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{
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LOG(WARNING) << sample_type_ << " unrecognized sample type. Assuming: "
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<< (is_complex_ ? (reverse_interleaving_ ? "qi" : "iq") : "real");
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}
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try
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{
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file_source_ = gr::blocks::file_source::make(item_size_, filename_.c_str(), repeat_);
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if (seconds_to_skip > 0)
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{
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bytes_to_skip = static_cast<int64_t>(
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seconds_to_skip * sampling_frequency_ / 4);
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if (is_complex_)
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{
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bytes_to_skip <<= 1;
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}
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file_source_->seek(bytes_to_skip, SEEK_SET);
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}
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unpack_samples_ = make_unpack_2bit_samples(big_endian_bytes_,
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item_size_, big_endian_items_, reverse_interleaving_);
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if (is_complex_)
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{
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char_to_float_ =
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gr::blocks::interleaved_char_to_complex::make(false);
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}
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else
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{
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char_to_float_ =
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gr::blocks::char_to_float::make();
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}
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}
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catch (const std::exception& e)
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{
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std::cerr
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<< "The receiver was configured to work with a file signal source "
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<< std::endl
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<< "but the specified file is unreachable by GNSS-SDR."
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<< std::endl
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<< "Please modify your configuration file"
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<< std::endl
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<< "and point SignalSource.filename to a valid raw data file. Then:"
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<< std::endl
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<< "$ gnss-sdr --config_file=/path/to/my_GNSS_SDR_configuration.conf"
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<< std::endl
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<< "Examples of configuration files available at:"
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<< std::endl
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<< GNSSSDR_INSTALL_DIR "/share/gnss-sdr/conf/"
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<< std::endl;
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LOG(WARNING) << "file_signal_source: Unable to open the samples file "
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<< filename_.c_str() << ", exiting the program.";
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throw(e);
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}
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DLOG(INFO) << "file_source(" << file_source_->unique_id() << ")";
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size_t output_item_size = (is_complex_ ? sizeof(gr_complex) : sizeof(float));
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if (samples_ == 0) // read all file
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{
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/*!
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* BUG workaround: The GNU Radio file source does not stop the receiver after reaching the End of File.
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* A possible solution is to compute the file length in samples using file size, excluding the last 2 milliseconds, and enable always the
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* valve block
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*/
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std::ifstream file(filename_.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
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std::ifstream::pos_type size;
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if (file.is_open())
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{
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size = file.tellg();
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samples_ = floor(static_cast<double>(size) * (is_complex_ ? 2.0 : 4.0));
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LOG(INFO) << "Total samples in the file= " << samples_; // 4 samples per byte
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samples_ -= bytes_to_skip;
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// Also skip the last two milliseconds:
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samples_ -= ceil(0.002 * sampling_frequency_ / (is_complex_ ? 2.0 : 4.0));
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}
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else
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{
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std::cout << "file_signal_source: Unable to open the samples file " << filename_.c_str() << std::endl;
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LOG(ERROR) << "file_signal_source: Unable to open the samples file " << filename_.c_str();
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}
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std::streamsize ss = std::cout.precision();
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std::cout << std::setprecision(16);
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std::cout << "Processing file " << filename_ << ", which contains " << size << " [bytes]" << std::endl;
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std::cout.precision(ss);
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}
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CHECK(samples_ > 0) << "File does not contain enough samples to process.";
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double signal_duration_s;
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signal_duration_s = static_cast<double>(samples_) * (1 / static_cast<double>(sampling_frequency_));
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LOG(INFO) << "Total number samples to be processed= " << samples_ << " GNSS signal duration= " << signal_duration_s << " [s]";
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std::cout << "GNSS signal recorded time to be processed: " << signal_duration_s << " [s]" << std::endl;
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valve_ = gnss_sdr_make_valve(output_item_size, samples_, queue_);
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DLOG(INFO) << "valve(" << valve_->unique_id() << ")";
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if (dump_)
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{
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// sink_ = gr_make_file_sink(item_size_, dump_filename_.c_str());
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sink_ = gr::blocks::file_sink::make(output_item_size, dump_filename_.c_str());
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DLOG(INFO) << "file_sink(" << sink_->unique_id() << ")";
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}
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if (enable_throttle_control_)
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{
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throttle_ = gr::blocks::throttle::make(output_item_size, sampling_frequency_);
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}
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DLOG(INFO) << "File source filename " << filename_;
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DLOG(INFO) << "Samples " << samples_;
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DLOG(INFO) << "Sampling frequency " << sampling_frequency_;
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DLOG(INFO) << "Item type " << item_type_;
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DLOG(INFO) << "Item size " << item_size_;
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DLOG(INFO) << "Repeat " << repeat_;
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DLOG(INFO) << "Dump " << dump_;
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DLOG(INFO) << "Dump filename " << dump_filename_;
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if (in_streams_ > 0)
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{
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LOG(ERROR) << "A signal source does not have an input stream";
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}
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if (out_streams_ > 1)
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{
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LOG(ERROR) << "This implementation only supports one output stream";
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}
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}
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void TwoBitPackedFileSignalSource::connect(gr::top_block_sptr top_block)
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{
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gr::basic_block_sptr left_block = file_source_;
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gr::basic_block_sptr right_block = unpack_samples_;
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top_block->connect(file_source_, 0, unpack_samples_, 0);
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left_block = right_block;
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DLOG(INFO) << "connected file source to unpack samples";
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right_block = char_to_float_;
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top_block->connect(left_block, 0, right_block, 0);
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left_block = right_block;
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DLOG(INFO) << "connected unpack samples to char to float";
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if (enable_throttle_control_)
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{
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right_block = throttle_;
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top_block->connect(left_block, 0, right_block, 0);
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left_block = right_block;
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DLOG(INFO) << " connected to throttle";
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}
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top_block->connect(left_block, 0, valve_, 0);
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DLOG(INFO) << "connected to valve";
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if (dump_)
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{
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top_block->connect(valve_, 0, sink_, 0);
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DLOG(INFO) << "connected valve to file sink";
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}
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}
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void TwoBitPackedFileSignalSource::disconnect(gr::top_block_sptr top_block)
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{
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gr::basic_block_sptr left_block = file_source_;
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gr::basic_block_sptr right_block = unpack_samples_;
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top_block->disconnect(file_source_, 0, unpack_samples_, 0);
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left_block = right_block;
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DLOG(INFO) << "disconnected file source to unpack samples";
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right_block = char_to_float_;
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top_block->disconnect(left_block, 0, right_block, 0);
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left_block = right_block;
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DLOG(INFO) << "disconnected unpack samples to char to float";
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if (enable_throttle_control_)
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{
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right_block = throttle_;
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top_block->disconnect(left_block, 0, right_block, 0);
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left_block = right_block;
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DLOG(INFO) << " disconnected to throttle";
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}
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top_block->disconnect(left_block, 0, valve_, 0);
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DLOG(INFO) << "disconnected to valve";
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if (dump_)
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{
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top_block->disconnect(valve_, 0, sink_, 0);
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DLOG(INFO) << "disconnected valve to file sink";
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}
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}
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gr::basic_block_sptr TwoBitPackedFileSignalSource::get_left_block()
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{
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LOG(WARNING) << "Left block of a signal source should not be retrieved";
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// return gr_block_sptr();
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return gr::blocks::file_source::sptr();
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}
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gr::basic_block_sptr TwoBitPackedFileSignalSource::get_right_block()
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{
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return valve_;
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}
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