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next round of abstraction. Add nsr_file_signal_source

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This commit is contained in:
Jim Melton 2021-02-12 16:18:23 -07:00
parent c8ecc907c9
commit 4399aa5d10
7 changed files with 90 additions and 345 deletions
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2
src/algorithms/signal_source/adapters/file_signal_source.cc
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@ -24,7 +24,7 @@ using namespace std::string_literals;
FileSignalSource::FileSignalSource(ConfigurationInterface const* configuration, FileSignalSource::FileSignalSource(ConfigurationInterface const* configuration,
std::string const& role, unsigned int in_streams, unsigned int out_streams, std::string const& role, unsigned int in_streams, unsigned int out_streams,
Concurrent_Queue<pmt::pmt_t>* queue) Concurrent_Queue<pmt::pmt_t>* queue)
: FileSourceBase(configuration, role, "File_Signal_Source"s, queue) : FileSourceBase(configuration, role, "File_Signal_Source"s, queue, "short"s)
{ {
if (in_streams > 0) if (in_streams > 0)
{ {

66
src/algorithms/signal_source/adapters/file_source_base.cc
View File

@ -177,6 +177,7 @@ uint64_t FileSourceBase::samples() const
void FileSourceBase::init() void FileSourceBase::init()
{ {
create_file_source(); create_file_source();
// At this point, we know that the file exists // At this point, we know that the file exists
samples_ = computeSamplesInFile(); samples_ = computeSamplesInFile();
auto signal_duration_s = 1.0 * samples_ / sampling_frequency_; auto signal_duration_s = 1.0 * samples_ / sampling_frequency_;
@ -196,6 +197,7 @@ void FileSourceBase::init()
DLOG(INFO) << "Item type " << item_type_; DLOG(INFO) << "Item type " << item_type_;
DLOG(INFO) << "Item size " << item_size_; DLOG(INFO) << "Item size " << item_size_;
DLOG(INFO) << "Repeat " << repeat_; DLOG(INFO) << "Repeat " << repeat_;
DLOG(INFO) << "Dump " << dump_; DLOG(INFO) << "Dump " << dump_;
DLOG(INFO) << "Dump filename " << dump_filename_; DLOG(INFO) << "Dump filename " << dump_filename_;
@ -206,12 +208,13 @@ void FileSourceBase::init()
FileSourceBase::FileSourceBase(ConfigurationInterface const* configuration, std::string role, std::string impl, FileSourceBase::FileSourceBase(ConfigurationInterface const* configuration, std::string role, std::string impl,
Concurrent_Queue<pmt::pmt_t>* queue) Concurrent_Queue<pmt::pmt_t>* queue,
std::string default_item_type)
: SignalSourceBase(configuration, role, impl) : SignalSourceBase(configuration, role, impl)
, filename_(configuration->property(role + ".filename"s, "../data/example_capture.dat"s)) , filename_(configuration->property(role + ".filename"s, "../data/example_capture.dat"s))
, file_source_() , file_source_()
, item_type_(configuration->property(role + ".item_type"s, "short"s)) , item_type_(configuration->property(role + ".item_type"s, default_item_type))
, item_size_(0) // invalid , item_size_(0) // invalid
, is_complex_(false) , is_complex_(false)
@ -283,6 +286,9 @@ std::tuple<size_t, bool> FileSourceBase::itemTypeToSize() const
return std::make_tuple(item_size, is_complex); return std::make_tuple(item_size, is_complex);
} }
// Default case is one decoded packet per one read sample
double FileSourceBase::packetsPerSample() const { return 1.0; }
size_t FileSourceBase::samplesToSkip() const size_t FileSourceBase::samplesToSkip() const
{ {
auto samples_to_skip = size_t(0); auto samples_to_skip = size_t(0);
@ -310,32 +316,38 @@ size_t FileSourceBase::computeSamplesInFile() const
auto n_samples = size_t(samples()); auto n_samples = size_t(samples());
// this could throw, but the existence of the file has been proven before we get here. // if configured with 0 samples (read the whole file), figure out how many samples are in the file, and go from there
auto size = fs::file_size(filename()); if (n_samples == 0)
n_samples = std::floor(1.0 * size / item_size());
auto to_skip = samplesToSkip();
/*!
* BUG workaround: The GNU Radio file source does not stop the receiver after reaching the End of File.
* A possible solution is to compute the file length in samples using file size, excluding at least
* the last 2 milliseconds, and enable always the valve block
*/
auto tail = static_cast<size_t>(std::ceil(0.002 * sampling_frequency()));
DLOG(INFO) << "Total samples in the file= " << n_samples;
std::cout << "Processing file " << filename() << ", which contains " << n_samples << " samples (" << size << " bytes)\n";
if (n_samples > (to_skip + tail))
{ {
// process all the samples available in the file excluding up to the last 2 ms // this could throw, but the existence of the file has been proven before we get here.
n_samples -= to_skip + tail; auto size = fs::file_size(filename());
}
else // if there is some kind of compression/encoding, figure out the uncompressed number of samples
{ n_samples = std::floor(packetsPerSample() * size / item_size());
// this will terminate the program
LOG(FATAL) << "Skipping " << to_skip << " samples from the front and truncating 2ms (" << tail << " samples)\n" auto to_skip = samplesToSkip();
<< "is greater than the number of samples in the file (" << n_samples << ")";
/*!
* BUG workaround: The GNU Radio file source does not stop the receiver after reaching the End of File.
* A possible solution is to compute the file length in samples using file size, excluding at least
* the last 2 milliseconds, and enable always the valve block
*/
auto tail = static_cast<size_t>(std::ceil(0.002 * sampling_frequency()));
DLOG(INFO) << "Total samples in the file= " << n_samples;
std::cout << "Processing file " << filename() << ", which contains " << n_samples << " samples (" << size << " bytes)\n";
if (n_samples > (to_skip + tail))
{
// process all the samples available in the file excluding up to the last 2 ms
n_samples -= to_skip + tail;
}
else
{
// this will terminate the program
LOG(FATAL) << "Skipping " << to_skip << " samples from the front and truncating 2ms (" << tail << " samples)\n"
<< "is greater than the number of samples in the file (" << n_samples << ")";
}
} }
return n_samples; return n_samples;

9
src/algorithms/signal_source/adapters/file_source_base.h
View File

@ -84,13 +84,20 @@ public:
protected: protected:
//! Constructor //! Constructor
// Subclasses may want to assert default item types that are appropriate to the specific file
// type supported. Rather than require the item type to be specified in the config file, allow
// sub-classes to impose their will
FileSourceBase(ConfigurationInterface const* configuration, std::string role, std::string impl, FileSourceBase(ConfigurationInterface const* configuration, std::string role, std::string impl,
Concurrent_Queue<pmt::pmt_t>* queue); Concurrent_Queue<pmt::pmt_t>* queue,
std::string default_item_type="short");
//! compute the item size, from the item_type(). Subclasses may constrain types that don't make //! compute the item size, from the item_type(). Subclasses may constrain types that don't make
// sense. The return of this method is a tuple of item_size and is_complex // sense. The return of this method is a tuple of item_size and is_complex
virtual std::tuple<size_t, bool> itemTypeToSize() const; virtual std::tuple<size_t, bool> itemTypeToSize() const;
//! the number of (possibly unpacked) samples in a (raw) file sample (default=1)
virtual double packetsPerSample() const;
//! compute the number of samples to skip //! compute the number of samples to skip
virtual size_t samplesToSkip() const; virtual size_t samplesToSkip() const;

273
src/algorithms/signal_source/adapters/nsr_file_signal_source.cc
View File

@ -10,289 +10,68 @@
* GNSS-SDR is a Global Navigation Satellite System software-defined receiver. * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
* This file is part of GNSS-SDR. * This file is part of GNSS-SDR.
* *
* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors) * Copyright (C) 2010-2021 (see AUTHORS file for a list of contributors)
* SPDX-License-Identifier: GPL-3.0-or-later * SPDX-License-Identifier: GPL-3.0-or-later
* *
* ----------------------------------------------------------------------------- * -----------------------------------------------------------------------------
*/ */
#include "nsr_file_signal_source.h" #include "nsr_file_signal_source.h"
#include "configuration_interface.h"
#include "gnss_sdr_flags.h"
#include "gnss_sdr_valve.h"
#include <glog/logging.h> #include <glog/logging.h>
#include <exception>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <utility>
using namespace std::string_literals; using namespace std::string_literals;
NsrFileSignalSource::NsrFileSignalSource(const ConfigurationInterface* configuration, NsrFileSignalSource::NsrFileSignalSource(const ConfigurationInterface* configuration,
const std::string& role, unsigned int in_streams, unsigned int out_streams, const std::string& role, unsigned int in_streams, unsigned int out_streams,
Concurrent_Queue<pmt::pmt_t>* queue) Concurrent_Queue<pmt::pmt_t>* queue)
: SignalSourceBase(configuration, role, "Nsr_File_Signal_Source"s) : FileSourceBase(configuration, role, "Nsr_File_Signal_Source"s, queue, "byte"s)
, in_streams_(in_streams), out_streams_(out_streams)
{ {
const std::string default_filename("../data/my_capture.dat"); if (in_streams > 0)
const std::string default_item_type("byte");
const std::string default_dump_filename("../data/my_capture_dump.dat");
samples_ = configuration->property(role + ".samples", static_cast<uint64_t>(0));
sampling_frequency_ = configuration->property(role + ".sampling_frequency", static_cast<int64_t>(0));
filename_ = configuration->property(role + ".filename", default_filename);
// override value with commandline flag, if present
if (FLAGS_signal_source != "-")
{
filename_ = FLAGS_signal_source;
}
if (FLAGS_s != "-")
{
filename_ = FLAGS_s;
}
item_type_ = configuration->property(role + ".item_type", default_item_type);
repeat_ = configuration->property(role + ".repeat", false);
dump_ = configuration->property(role + ".dump", false);
dump_filename_ = configuration->property(role + ".dump_filename", default_dump_filename);
enable_throttle_control_ = configuration->property(role + ".enable_throttle_control", false);
if (item_type_ == "byte")
{
item_size_ = sizeof(char);
}
else
{
LOG(WARNING) << item_type_ << " unrecognized item type. Using byte.";
item_size_ = sizeof(char);
}
try
{
file_source_ = gr::blocks::file_source::make(item_size_, filename_.c_str(), repeat_);
unpack_byte_ = make_unpack_byte_2bit_samples();
}
catch (const std::exception& e)
{
std::cerr
<< "The receiver was configured to work with a file signal source\n"
<< "but the specified file is unreachable by GNSS-SDR.\n"
<< "Please modify your configuration file\n"
<< "and point " << role << ".filename to a valid raw data file. Then:\n"
<< "$ gnss-sdr --config_file=/path/to/my_GNSS_SDR_configuration.conf\n"
<< "Examples of configuration files available at:\n"
<< GNSSSDR_INSTALL_DIR "/share/gnss-sdr/conf/\n";
LOG(WARNING) << "nsr_file_signal_source: Unable to open the samples file "
<< filename_ << ", exiting the program.";
throw;
}
DLOG(INFO) << "file_source(" << file_source_->unique_id() << ")";
if (samples_ == 0) // read all file
{
/*!
* BUG workaround: The GNU Radio file source does not stop the receiver after reaching the End of File.
* A possible solution is to compute the file length in samples using file size, excluding the last 2 milliseconds, and enable always the
* valve block
*/
std::ifstream file(filename_.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
std::ifstream::pos_type size;
if (file.is_open())
{
size = file.tellg();
LOG(INFO) << "Total samples in the file= " << floor(static_cast<double>(size) / static_cast<double>(item_size()));
}
else
{
std::cout << "file_signal_source: Unable to open the samples file " << filename_.c_str() << '\n';
LOG(ERROR) << "file_signal_source: Unable to open the samples file " << filename_.c_str();
}
std::streamsize ss = std::cout.precision();
std::cout << std::setprecision(16);
std::cout << "Processing file " << filename_ << ", which contains " << size << " [bytes]\n";
std::cout.precision(ss);
if (size > 0)
{
int sample_packet_factor = 4; // 1 byte -> 4 samples
samples_ = floor(static_cast<double>(size) / static_cast<double>(item_size())) * sample_packet_factor;
samples_ = samples_ - ceil(0.002 * static_cast<double>(sampling_frequency_)); // process all the samples available in the file excluding the last 2 ms
}
}
CHECK(samples_ > 0) << "File does not contain enough samples to process.";
const double signal_duration_s = static_cast<double>(samples_) * (1 / static_cast<double>(sampling_frequency_));
LOG(INFO) << "Total number samples to be processed= " << samples_ << " GNSS signal duration= " << signal_duration_s << " [s]";
std::cout << "GNSS signal recorded time to be processed: " << signal_duration_s << " [s]\n";
valve_ = gnss_sdr_make_valve(sizeof(float), samples_, queue);
DLOG(INFO) << "valve(" << valve_->unique_id() << ")";
if (dump_)
{
// sink_ = gr_make_file_sink(item_size_, dump_filename_.c_str());
sink_ = gr::blocks::file_sink::make(sizeof(float), dump_filename_.c_str());
DLOG(INFO) << "file_sink(" << sink_->unique_id() << ")";
}
if (enable_throttle_control_)
{
throttle_ = gr::blocks::throttle::make(sizeof(float), sampling_frequency_);
}
DLOG(INFO) << "File source filename " << filename_;
DLOG(INFO) << "Samples " << samples_;
DLOG(INFO) << "Sampling frequency " << sampling_frequency_;
DLOG(INFO) << "Item type " << item_type_;
DLOG(INFO) << "Item size " << item_size_;
DLOG(INFO) << "Repeat " << repeat_;
DLOG(INFO) << "Dump " << dump_;
DLOG(INFO) << "Dump filename " << dump_filename_;
if (in_streams_ > 0)
{ {
LOG(ERROR) << "A signal source does not have an input stream"; LOG(ERROR) << "A signal source does not have an input stream";
} }
if (out_streams_ > 1) if (out_streams > 1)
{ {
LOG(ERROR) << "This implementation only supports one output stream"; LOG(ERROR) << "This implementation only supports one output stream";
} }
} }
std::tuple<size_t, bool> NsrFileSignalSource::itemTypeToSize() const
void NsrFileSignalSource::connect(gr::top_block_sptr top_block)
{ {
if (samples_ > 0) auto is_complex = false;
auto item_size = size_t(sizeof(char)); // default
if (item_type() == "byte")
{ {
if (enable_throttle_control_ == true) item_size = sizeof(char);
{
top_block->connect(file_source_, 0, unpack_byte_, 0);
top_block->connect(unpack_byte_, 0, throttle_, 0);
DLOG(INFO) << "connected file source to throttle";
top_block->connect(throttle_, 0, valve_, 0);
DLOG(INFO) << "connected throttle to valve";
if (dump_)
{
top_block->connect(valve_, 0, sink_, 0);
DLOG(INFO) << "connected valve to file sink";
}
}
else
{
top_block->connect(file_source_, 0, unpack_byte_, 0);
top_block->connect(unpack_byte_, 0, valve_, 0);
DLOG(INFO) << "connected file source to valve";
if (dump_)
{
top_block->connect(valve_, 0, sink_, 0);
DLOG(INFO) << "connected valve to file sink";
}
}
} }
else else
{ {
if (enable_throttle_control_ == true) LOG(WARNING) << item_type() << " unrecognized item type. Using byte.";
{
top_block->connect(file_source_, 0, unpack_byte_, 0);
top_block->connect(unpack_byte_, 0, throttle_, 0);
DLOG(INFO) << "connected file source to throttle";
if (dump_)
{
top_block->connect(throttle_, 0, sink_, 0);
DLOG(INFO) << "connected file source to sink";
}
}
else
{
if (dump_)
{
top_block->connect(file_source_, 0, unpack_byte_, 0);
top_block->connect(unpack_byte_, 0, sink_, 0);
DLOG(INFO) << "connected file source to sink";
}
}
} }
return std::make_tuple(item_size, is_complex);
} }
// 1 byte -> 4 samples
double NsrFileSignalSource::packetsPerSample() const { return 4.0; }
gnss_shared_ptr<gr::block> NsrFileSignalSource::source() const { return unpack_byte_; }
void NsrFileSignalSource::disconnect(gr::top_block_sptr top_block)
void NsrFileSignalSource::create_file_source_hook()
{ {
if (samples_ > 0) unpack_byte_ = make_unpack_byte_2bit_samples();
{ DLOG(INFO) << "unpack_byte_2bit_samples(" << unpack_byte_->unique_id() << ")";
if (enable_throttle_control_ == true)
{
top_block->disconnect(file_source_, 0, unpack_byte_, 0);
DLOG(INFO) << "disconnected file source to unpack_byte_";
top_block->connect(unpack_byte_, 0, throttle_, 0);
DLOG(INFO) << "disconnected unpack_byte_ to throttle_";
top_block->disconnect(throttle_, 0, valve_, 0);
DLOG(INFO) << "disconnected throttle to valve";
if (dump_)
{
top_block->disconnect(valve_, 0, sink_, 0);
DLOG(INFO) << "disconnected valve to file sink";
}
}
else
{
top_block->disconnect(file_source_, 0, unpack_byte_, 0);
DLOG(INFO) << "disconnected file source to unpack_byte_";
top_block->disconnect(unpack_byte_, 0, valve_, 0);
DLOG(INFO) << "disconnected unpack_byte_ to valve";
if (dump_)
{
top_block->disconnect(valve_, 0, sink_, 0);
DLOG(INFO) << "disconnected valve to file sink";
}
}
}
else
{
if (enable_throttle_control_ == true)
{
top_block->disconnect(file_source_, 0, unpack_byte_, 0);
DLOG(INFO) << "disconnected file source to unpack_byte_";
top_block->disconnect(unpack_byte_, 0, throttle_, 0);
DLOG(INFO) << "disconnected unpack_byte_ to throttle";
if (dump_)
{
top_block->disconnect(unpack_byte_, 0, sink_, 0);
DLOG(INFO) << "disconnected funpack_byte_ to sink";
}
}
else
{
if (dump_)
{
top_block->disconnect(file_source_, 0, unpack_byte_, 0);
DLOG(INFO) << "disconnected file source to unpack_byte_";
top_block->disconnect(unpack_byte_, 0, sink_, 0);
DLOG(INFO) << "disconnected unpack_byte_ to sink";
}
}
}
} }
void NsrFileSignalSource::pre_connect_hook(gr::top_block_sptr top_block)
gr::basic_block_sptr NsrFileSignalSource::get_left_block()
{ {
LOG(WARNING) << "Left block of a signal source should not be retrieved"; top_block->connect(file_source(), 0, unpack_byte_, 0);
// return gr_block_sptr(); DLOG(INFO) << "connected file_source to unpacker";
return gr::blocks::file_source::sptr();
} }
void NsrFileSignalSource::pre_disconnect_hook(gr::top_block_sptr top_block)
gr::basic_block_sptr NsrFileSignalSource::get_right_block()
{ {
if (samples_ > 0) top_block->disconnect(file_source(), 0, unpack_byte_, 0);
{ DLOG(INFO) << "disconnected file_source from unpacker";
return valve_;
}
if (enable_throttle_control_ == true)
{
return throttle_;
}
return unpack_byte_;
} }

71
src/algorithms/signal_source/adapters/nsr_file_signal_source.h
View File

@ -12,7 +12,7 @@
* GNSS-SDR is a Global Navigation Satellite System software-defined receiver. * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
* This file is part of GNSS-SDR. * This file is part of GNSS-SDR.
* *
* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors) * Copyright (C) 2010-2021 (see AUTHORS file for a list of contributors)
* SPDX-License-Identifier: GPL-3.0-or-later * SPDX-License-Identifier: GPL-3.0-or-later
* *
* ----------------------------------------------------------------------------- * -----------------------------------------------------------------------------
@ -21,17 +21,9 @@
#ifndef GNSS_SDR_NSR_FILE_SIGNAL_SOURCE_H #ifndef GNSS_SDR_NSR_FILE_SIGNAL_SOURCE_H
#define GNSS_SDR_NSR_FILE_SIGNAL_SOURCE_H #define GNSS_SDR_NSR_FILE_SIGNAL_SOURCE_H
#include "signal_source_base.h" #include "file_source_base.h"
#include "concurrent_queue.h"
#include "gnss_block_interface.h"
#include "unpack_byte_2bit_samples.h" #include "unpack_byte_2bit_samples.h"
#include <gnuradio/blocks/file_sink.h>
#include <gnuradio/blocks/file_source.h>
#include <gnuradio/blocks/throttle.h>
#include <gnuradio/hier_block2.h>
#include <pmt/pmt.h>
#include <string>
/** \addtogroup Signal_Source /** \addtogroup Signal_Source
* \{ */ * \{ */
@ -44,7 +36,7 @@ class ConfigurationInterface;
* \brief Class that reads signals samples from a file * \brief Class that reads signals samples from a file
* and adapts it to a SignalSourceInterface * and adapts it to a SignalSourceInterface
*/ */
class NsrFileSignalSource : public SignalSourceBase class NsrFileSignalSource : public FileSourceBase
{ {
public: public:
NsrFileSignalSource(const ConfigurationInterface* configuration, const std::string& role, NsrFileSignalSource(const ConfigurationInterface* configuration, const std::string& role,
@ -53,59 +45,16 @@ public:
~NsrFileSignalSource() = default; ~NsrFileSignalSource() = default;
inline size_t item_size() override protected:
{ std::tuple<size_t, bool> itemTypeToSize() const override;
return item_size_; double packetsPerSample() const override;
} gnss_shared_ptr<gr::block> source() const override;
void create_file_source_hook() override;
void connect(gr::top_block_sptr top_block) override; void pre_connect_hook(gr::top_block_sptr top_block) override;
void disconnect(gr::top_block_sptr top_block) override; void pre_disconnect_hook(gr::top_block_sptr top_block) override;
gr::basic_block_sptr get_left_block() override;
gr::basic_block_sptr get_right_block() override;
inline std::string filename() const
{
return filename_;
}
inline std::string item_type() const
{
return item_type_;
}
inline bool repeat() const
{
return repeat_;
}
inline int64_t sampling_frequency() const
{
return sampling_frequency_;
}
inline uint64_t samples() const
{
return samples_;
}
private: private:
gr::blocks::file_source::sptr file_source_;
unpack_byte_2bit_samples_sptr unpack_byte_; unpack_byte_2bit_samples_sptr unpack_byte_;
gnss_shared_ptr<gr::block> valve_;
gr::blocks::file_sink::sptr sink_;
gr::blocks::throttle::sptr throttle_;
uint64_t samples_;
int64_t sampling_frequency_;
size_t item_size_;
std::string filename_;
std::string item_type_;
std::string dump_filename_;
uint32_t in_streams_;
uint32_t out_streams_;
bool repeat_;
bool dump_;
// Throttle control
bool enable_throttle_control_;
}; };

2
src/algorithms/signal_source/adapters/spir_file_signal_source.cc
View File

@ -24,7 +24,7 @@ using namespace std::string_literals;
SpirFileSignalSource::SpirFileSignalSource(const ConfigurationInterface* configuration, SpirFileSignalSource::SpirFileSignalSource(const ConfigurationInterface* configuration,
const std::string& role, unsigned int in_streams, unsigned int out_streams, const std::string& role, unsigned int in_streams, unsigned int out_streams,
Concurrent_Queue<pmt::pmt_t>* queue) Concurrent_Queue<pmt::pmt_t>* queue)
: FileSourceBase(configuration, role, "Spir_File_Signal_Source"s, queue) : FileSourceBase(configuration, role, "Spir_File_Signal_Source"s, queue, "int"s)
{ {
if (in_streams > 0) if (in_streams > 0)
{ {

12
src/algorithms/signal_source/adapters/spir_file_signal_source.h
View File

@ -19,7 +19,6 @@
#define GNSS_SDR_SPIR_FILE_SIGNAL_SOURCE_H #define GNSS_SDR_SPIR_FILE_SIGNAL_SOURCE_H
#include "file_source_base.h" #include "file_source_base.h"
#include "unpack_intspir_1bit_samples.h" #include "unpack_intspir_1bit_samples.h"
@ -45,12 +44,11 @@ public:
~SpirFileSignalSource() = default; ~SpirFileSignalSource() = default;
protected: protected:
std::tuple<size_t, bool> itemTypeToSize() const override; std::tuple<size_t, bool> itemTypeToSize() const override;
gnss_shared_ptr<gr::block> source() const override; gnss_shared_ptr<gr::block> source() const override;
void create_file_source_hook() override; void create_file_source_hook() override;
void pre_connect_hook(gr::top_block_sptr top_block) override; void pre_connect_hook(gr::top_block_sptr top_block) override;
void post_disconnect_hook(gr::top_block_sptr top_block) override; void post_disconnect_hook(gr::top_block_sptr top_block) override;
private: private: