feat: add extra data source

src/algorithms/PVT/gnuradio_blocks/rtklib_pvt_gs.cc

@@ -1993,7 +1993,7 @@ int rtklib_pvt_gs::work(int noutput_items, gr_vector_const_void_star& input_item
         {
             std::vector<gr::tag_t> tags_vec;
             // time tag from obs to pvt is always propagated in channel 0
-            this->get_tags_in_range(tags_vec, 0, this->nitems_read(0), this->nitems_read(0) + noutput_items);
+            this->get_tags_in_range(tags_vec, 0, this->nitems_read(0), this->nitems_read(0) + noutput_items, pmt::mp("timetag"));
             for (const auto& it : tags_vec)
                 {
                     try

src/algorithms/observables/gnuradio_blocks/hybrid_observables_gs.cc

@@ -70,6 +70,7 @@ hybrid_observables_gs::hybrid_observables_gs(const Obs_Conf &conf_)
       d_smooth_filter_M(static_cast<double>(conf_.smoothing_factor)),
       d_T_rx_step_s(static_cast<double>(conf_.observable_interval_ms) / 1000.0),
       d_last_rx_clock_round20ms_error(0.0),
+      d_ref_channel(0U),
       d_T_rx_TOW_ms(0U),
       d_T_rx_step_ms(conf_.observable_interval_ms),
       d_T_status_report_timer_ms(0),
@@ -225,6 +226,7 @@ void hybrid_observables_gs::msg_handler_pvt_to_observables(const pmt::pmt_t &msg
                         {
                         case 1:  // reset TOW
                             d_T_rx_TOW_ms = 0;
+                            d_ref_channel = 0;
                             d_last_rx_clock_round20ms_error = 0;
                             d_T_rx_TOW_set = false;
                             for (uint32_t n = 0; n < d_nchannels_out; n++)
@@ -508,17 +510,20 @@ void hybrid_observables_gs::update_TOW(const std::vector<Gnss_Synchro> &data)
         {
             // int32_t TOW_ref = std::numeric_limits<uint32_t>::max();
             uint32_t TOW_ref = 0U;
+            uint32_t ref_ch = 0U;
             for (it = data.cbegin(); it != data.cend(); it++)
                 {
                     if (it->Flag_valid_word)
                         {
                             if (it->TOW_at_current_symbol_ms > TOW_ref)
                                 {
+                                    ref_ch = it->Channel_ID;
                                     TOW_ref = it->TOW_at_current_symbol_ms;
                                     d_T_rx_TOW_set = true;
                                 }
                         }
                 }
+            d_ref_channel = ref_ch;
             d_T_rx_TOW_ms = TOW_ref;
             // align the receiver clock to integer multiple of d_T_rx_step_ms
             if (d_T_rx_TOW_ms % d_T_rx_step_ms)
@@ -657,6 +662,22 @@ void hybrid_observables_gs::set_tag_timestamp_in_sdr_timeframe(const std::vector
         }
 }
 
+void hybrid_observables_gs::propagate_extra_data(const std::vector<Gnss_Synchro> &data)
+{
+    if (d_extra_data_tags.empty())
+        {
+            return;
+        }
+
+    do
+        {
+            auto &tag = d_extra_data_tags.front();
+            add_item_tag(0, this->nitems_written(0) + 1, tag.key, tag.value);
+            d_extra_data_tags.pop();
+        }
+    while (!d_extra_data_tags.empty());
+}
+
 
 int hybrid_observables_gs::general_work(int noutput_items __attribute__((unused)),
     gr_vector_int &ninput_items, gr_vector_const_void_star &input_items,
@@ -671,9 +692,21 @@ int hybrid_observables_gs::general_work(int noutput_items __attribute__((unused)
         {
             d_Rx_clock_buffer.push_back(in[d_nchannels_in - 1][0].Tracking_sample_counter);
 
-            // time tags
             std::vector<gr::tag_t> tags_vec;
-            this->get_tags_in_range(tags_vec, d_nchannels_in - 1, this->nitems_read(d_nchannels_in - 1), this->nitems_read(d_nchannels_in - 1) + 1);
+            // extra data tags
+            get_tags_in_range(tags_vec, d_nchannels_in - 1, this->nitems_read(d_nchannels_in - 1), this->nitems_read(d_nchannels_in - 1) + 1, pmt::mp("extra_data"));
+            // std::cout << "OBS (" << std::to_string(tags_vec.size()) << ")" << std::endl;
+            while (!d_extra_data_tags.empty())
+                {
+                    d_extra_data_tags.pop();
+                }
+            for (const auto &tag : tags_vec)
+                {
+                    d_extra_data_tags.emplace(tag);
+                }
+            // time tags
+            tags_vec.clear();
+            this->get_tags_in_range(tags_vec, d_nchannels_in - 1, this->nitems_read(d_nchannels_in - 1), this->nitems_read(d_nchannels_in - 1) + 1, pmt::mp("timetag"));
             for (const auto &it : tags_vec)
                 {
                     try
@@ -759,6 +792,8 @@ int hybrid_observables_gs::general_work(int noutput_items __attribute__((unused)
         {
             std::vector<Gnss_Synchro> epoch_data(d_nchannels_out);
             int32_t n_valid = 0;
+            std::vector<gr::tag_t> tags{};
+
             for (uint32_t n = 0; n < d_nchannels_out; n++)
                 {
                     Gnss_Synchro interpolated_gnss_synchro{};
@@ -794,6 +829,7 @@ int hybrid_observables_gs::general_work(int noutput_items __attribute__((unused)
                 {
                     compute_pranges(epoch_data);
                     set_tag_timestamp_in_sdr_timeframe(epoch_data, d_Rx_clock_buffer.front());
+                    propagate_extra_data(epoch_data);
                 }
 
             // Carrier smoothing (optional)

src/algorithms/observables/gnuradio_blocks/hybrid_observables_gs.h

@@ -79,6 +79,9 @@ private:
     void smooth_pseudoranges(std::vector<Gnss_Synchro>& data);
 
     void set_tag_timestamp_in_sdr_timeframe(const std::vector<Gnss_Synchro>& data, uint64_t rx_clock);
+
+    void propagate_extra_data(const std::vector<Gnss_Synchro> &data);
+
     int32_t save_matfile() const;
 
     Obs_Conf d_conf;
@@ -90,6 +93,8 @@ private:
     std::vector<std::queue<GnssTime>> d_SourceTagTimestamps;
     std::queue<GnssTime> d_TimeChannelTagTimestamps;
 
+    std::queue<gr::tag_t> d_extra_data_tags;
+
     std::vector<bool> d_channel_last_pll_lock;
     std::vector<double> d_channel_last_pseudorange_smooth;
     std::vector<double> d_channel_last_carrier_phase_rads;
@@ -102,6 +107,7 @@ private:
     double d_T_rx_step_s;
     double d_last_rx_clock_round20ms_error;
 
+    uint32_t d_ref_channel;
     uint32_t d_T_rx_TOW_ms;
     uint32_t d_T_rx_step_ms;
     uint32_t d_T_status_report_timer_ms;

src/algorithms/signal_source/adapters/file_source_base.cc

@@ -60,7 +60,15 @@ FileSourceBase::FileSourceBase(ConfigurationInterface const* configuration, std:
       is_complex_(false),
       repeat_(configuration->property(role_ + ".repeat"s, false)),
       enable_throttle_control_(configuration->property(role_ + ".enable_throttle_control"s, false)),
-      dump_(configuration->property(role_ + ".dump"s, false))
+      dump_(configuration->property(role_ + ".dump"s, false)),
+      // Configuration for attaching extra data to the sample stream
+      attach_extra_data_(configuration->property(role_ + ".extra_data.enabled"s, false)),
+      ed_path_(configuration->property(role_ + ".extra_data.filename"s, "../data/extra_data.dat"s)),
+      ed_offset_in_file_(configuration->property(role_ + ".extra_data.file_offset"s, 0UL)),
+      ed_item_size_(configuration->property(role_ + ".extra_data.item_size"s, 1UL)),
+      ed_repeat_(configuration->property(role_ + ".extra_data.repeat"s, false)),
+      ed_offset_in_samples_(configuration->property(role_ + ".extra_data.sample_offset"s, 0UL)),
+      ed_sample_period_(configuration->property(role_ + ".extra_data.sample_period"s, 1UL))
 {
     minimum_tail_s_ = std::max(configuration->property("Acquisition_1C.coherent_integration_time_ms", 0.0) * 0.001 * 2.0, minimum_tail_s_);
     minimum_tail_s_ = std::max(configuration->property("Acquisition_2S.coherent_integration_time_ms", 0.0) * 0.001 * 2.0, minimum_tail_s_);
@@ -157,6 +165,7 @@ void FileSourceBase::init()
     create_throttle();
     create_valve();
     create_sink();
+    create_extra_data_source();
 }
 
 
@@ -205,6 +214,14 @@ void FileSourceBase::connect(gr::top_block_sptr top_block)
             DLOG(INFO) << "connected output to file sink";
         }
 
+    // EXTRA DATA
+    if (extra_data_source())
+        {
+            top_block->connect(std::move(output), 0, extra_data_source(), 0);
+            DLOG(INFO) << "connected output to extra data source, which now becomes the new output";
+            output = extra_data_source();
+        }
+
     post_connect_hook(std::move(top_block));
 }
 
@@ -253,13 +270,21 @@ void FileSourceBase::disconnect(gr::top_block_sptr top_block)
             DLOG(INFO) << "disconnected output to file sink";
         }
 
+    // EXTRA DATA
+    if (extra_data_source())
+        {
+            // TODO - FIXME: This is NOT okay, `output` is the extra data source, not the valve/source/throttle/whatever is left of this
+            top_block->disconnect(std::move(output), 0, extra_data_source(), 0);
+            DLOG(INFO) << "disconnected output to extra data source";
+            output = extra_data_source();
+        }
+
     post_disconnect_hook(std::move(top_block));
 }
 
 
 gr::basic_block_sptr FileSourceBase::get_left_block()
 {
-    // TODO: is this right? Shouldn't the left block be a nullptr?
     LOG(WARNING) << "Left block of a signal source should not be retrieved";
     return gr::blocks::file_source::sptr();
 }
@@ -270,6 +295,7 @@ gr::basic_block_sptr FileSourceBase::get_right_block()
     // clang-tidy wants braces around the if-conditions. clang-format wants to break the braces into
     // multiple line blocks. It's much more readable this way
     // clang-format off
+    if (extra_data_source_) { return extra_data_source_; }
     if (valve_) { return valve_; }
     if (throttle_) { return throttle_; }
     return source();
@@ -478,6 +504,7 @@ gnss_shared_ptr<gr::block> FileSourceBase::file_source() const { return file_sou
 gnss_shared_ptr<gr::block> FileSourceBase::valve() const { return valve_; }
 gnss_shared_ptr<gr::block> FileSourceBase::throttle() const { return throttle_; }
 gnss_shared_ptr<gr::block> FileSourceBase::sink() const { return sink_; }
+ExtraDataSource::sptr FileSourceBase::extra_data_source() const { return extra_data_source_; }
 
 
 gr::blocks::file_source::sptr FileSourceBase::create_file_source()
@@ -574,6 +601,24 @@ gr::blocks::file_sink::sptr FileSourceBase::create_sink()
     return sink_;
 }
 
+ExtraDataSource::sptr FileSourceBase::create_extra_data_source()
+{
+    if (attach_extra_data_)
+        {
+            extra_data_source_ = std::make_shared<ExtraDataSource>(
+                ed_path_,
+                ed_offset_in_file_,
+                ed_item_size_,
+                ed_repeat_,
+                ed_offset_in_samples_,
+                ed_sample_period_,
+                gr::io_signature::make(1, 1, item_size_));
+            DLOG(INFO) << "extra_data_source(" << extra_data_source_->unique_id() << ")";
+        }
+    return extra_data_source_;
+}
+
+
 
 // Subclass hooks to augment created objects, as required
 void FileSourceBase::create_file_source_hook() {}

src/algorithms/signal_source/adapters/file_source_base.h

@@ -28,6 +28,8 @@
 #include <string>
 #include <tuple>
 
+#include "extra_data_source.h"
+
 /** \addtogroup Signal_Source
  * \{ */
 /** \addtogroup Signal_Source_adapters
@@ -131,6 +133,7 @@ protected:
     gnss_shared_ptr<gr::block> valve() const;
     gnss_shared_ptr<gr::block> throttle() const;
     gnss_shared_ptr<gr::block> sink() const;
+    ExtraDataSource::sptr extra_data_source() const;
 
     // The methods create the various blocks, if enabled, and return access to them. The created
     // object is also held in this class
@@ -138,6 +141,7 @@ protected:
     gr::blocks::throttle::sptr create_throttle();
     gnss_shared_ptr<gr::block> create_valve();
     gr::blocks::file_sink::sptr create_sink();
+    ExtraDataSource::sptr create_extra_data_source();
 
     // Subclass hooks to augment created objects, as required
     virtual void create_file_source_hook();
@@ -155,6 +159,7 @@ private:
     gr::blocks::file_source::sptr file_source_;
     gr::blocks::throttle::sptr throttle_;
     gr::blocks::file_sink::sptr sink_;
+    ExtraDataSource::sptr extra_data_source_;
 
     // The valve allows only the configured number of samples through, then it closes.
 
@@ -179,6 +184,15 @@ private:
     bool repeat_;
     bool enable_throttle_control_;
     bool dump_;
+
+    // Configuration for Extra Data source
+    bool attach_extra_data_;
+    std::string ed_path_;
+    std::size_t ed_offset_in_file_;
+    std::size_t ed_item_size_;
+    bool ed_repeat_;
+    std::size_t ed_offset_in_samples_;
+    std::size_t ed_sample_period_;
 };
 
 /** \} */

src/algorithms/signal_source/gnuradio_blocks/CMakeLists.txt

@@ -31,6 +31,7 @@ set(SIGNAL_SOURCE_GR_BLOCKS_SOURCES
     unpack_2bit_samples.cc
     unpack_spir_gss6450_samples.cc
     labsat23_source.cc
+    extra_data_source.cc
     ${OPT_DRIVER_SOURCES}
 )
 
@@ -45,6 +46,7 @@ set(SIGNAL_SOURCE_GR_BLOCKS_HEADERS
     unpack_2bit_samples.h
     unpack_spir_gss6450_samples.h
     labsat23_source.h
+    extra_data_source.h
     ${OPT_DRIVER_HEADERS}
 )
 

src/algorithms/signal_source/gnuradio_blocks/extra_data_source.cc

@@ -0,0 +1,82 @@
+/*!
+ * \file extra_data_source.cc
+ * \brief  GNURadio block that adds extra data to the sample stream.
+ * \author Victor Castillo, 2024. victorcastilloaguero(at).gmail.es
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
+ * This file is part of GNSS-SDR.
+ *
+ * Copyright (C) 2010-2021  (see AUTHORS file for a list of contributors)
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -----------------------------------------------------------------------------
+ */
+
+#include "extra_data_source.h"
+#include <pmt/pmt.h>
+
+
+ExtraDataSource::ExtraDataSource(
+    const std::string& path,
+    const std::size_t& offset_in_file,
+    const std::size_t& item_size,
+    const bool& repeat,
+    const std::size_t& offset_in_samples,
+    const std::size_t& sample_period,
+    const gr::io_signature::sptr& io_signature
+    )
+    : gr::sync_block("Extra Data Source",
+          io_signature, io_signature),
+      extra_data_file_(
+          path,
+          offset_in_file,
+          item_size,
+          repeat),
+      offset_in_samples_(offset_in_samples),
+      sample_period_(sample_period),
+      next_tagged_sample_(offset_in_samples_)
+{
+    if (io_signature->min_streams() != 1 and io_signature->max_streams() != 1)
+        {
+            std::cout << "ERROR: This block only supports adding data to a single stream." << "\n";
+        }
+}
+
+std::vector<uint8_t> ExtraDataSource::get_next_item()
+{
+    return extra_data_file_.read_item();
+}
+
+std::size_t ExtraDataSource::get_offset_in_samples() const
+{
+    return offset_in_samples_;
+}
+
+std::size_t ExtraDataSource::get_sample_period() const
+{
+    return sample_period_;
+}
+
+int ExtraDataSource::work(int noutput_items,
+    gr_vector_const_void_star& input_items,
+    gr_vector_void_star& output_items)
+{
+    const std::size_t ch = 0;
+    const int item_size = input_signature()->sizeof_stream_item(ch);
+    std::memcpy(output_items[ch], input_items[ch], noutput_items * item_size);
+
+    const uint64_t total_items_written = nitems_written(ch) + noutput_items;
+    if (total_items_written >= next_tagged_sample_)
+        {
+            for (uint64_t sample = next_tagged_sample_; sample < total_items_written; sample += sample_period_)
+                {
+                    auto extra_data_item = get_next_item();
+                    add_item_tag(ch, sample, pmt::mp("extra_data"), pmt::init_u8vector(extra_data_item.size(), extra_data_item));
+                    next_tagged_sample_ += sample_period_;
+                }
+        }
+
+    return noutput_items;
+}

src/algorithms/signal_source/gnuradio_blocks/extra_data_source.h

@@ -0,0 +1,72 @@
+/*!
+ * \file extra_data_source.h
+ * \brief  GNURadio block that adds extra data to the sample stream.
+ * \author Victor Castillo, 2024. victorcastilloaguero(at).gmail.es
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
+ * This file is part of GNSS-SDR.
+ *
+ * Copyright (C) 2010-2021  (see AUTHORS file for a list of contributors)
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -----------------------------------------------------------------------------
+ */
+
+
+#ifndef GNSS_SDR_EXTRA_DATA_SOURCE_H
+#define GNSS_SDR_EXTRA_DATA_SOURCE_H
+
+#include "gnss_block_interface.h"
+#include "extra_data_file.h"
+#include <gnuradio/sync_block.h>  // for sync_block
+#include <gnuradio/types.h>       // for gr_vector_const_void_star
+#include <cstddef>  // for size_t
+#include <cstdint>
+#include <string>
+
+/** \addtogroup Signal_Source
+ * \{ */
+/** \addtogroup Signal_Source_gnuradio_blocks
+ * \{ */
+
+
+class ExtraDataSource: public gr::sync_block
+{
+public:
+    using sptr = gnss_shared_ptr<ExtraDataSource>;
+
+    ExtraDataSource(
+        const std::string& path,
+        const std::size_t& offset_in_file,
+        const std::size_t& item_size,
+        const bool& repeat,
+        const std::size_t& offset_in_samples,
+        const std::size_t& sample_period,
+        const gr::io_signature::sptr& io_signature);
+
+private:
+    std::vector<uint8_t> get_next_item();
+
+    std::size_t get_offset_in_samples() const;
+
+    std::size_t get_sample_period() const;
+
+public:
+    int work(int noutput_items,
+        gr_vector_const_void_star& input_items,
+        gr_vector_void_star& output_items) override;
+
+private:
+    ExtraDataFile extra_data_file_;
+    std::size_t offset_in_samples_;
+    std::size_t sample_period_;
+
+    std::size_t next_tagged_sample_;
+};
+
+
+/** \} */
+/** \} */
+#endif  // GNSS_SDR_EXTRA_DATA_SOURCE_H

src/algorithms/signal_source/libs/CMakeLists.txt

@@ -56,6 +56,7 @@ set(SIGNAL_SOURCE_LIB_SOURCES
     rtl_tcp_dongle_info.cc
     gnss_sdr_valve.cc
     gnss_sdr_timestamp.cc
+    extra_data_file.cc
     ${OPT_SIGNAL_SOURCE_LIB_SOURCES}
 )
 
@@ -63,6 +64,7 @@ set(SIGNAL_SOURCE_LIB_HEADERS
     rtl_tcp_commands.h
     rtl_tcp_dongle_info.h
     gnss_sdr_valve.h
+    extra_data_file.h
     ${OPT_SIGNAL_SOURCE_LIB_HEADERS}
 )
 

src/algorithms/signal_source/libs/extra_data_file.cc

@@ -0,0 +1,93 @@
+/*!
+ * \file extra_data_file.cc
+ * \brief  Provides a simple abstraction for reading contiguous binary data from a file
+ * \author Victor Castillo, 2024. victorcastilloaguero(at).gmail.es
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
+ * This file is part of GNSS-SDR.
+ *
+ * Copyright (C) 2010-2021  (see AUTHORS file for a list of contributors)
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -----------------------------------------------------------------------------
+ */
+
+#include "extra_data_file.h"
+#include <cstring>
+
+ExtraDataFile::ExtraDataFile(
+    const std::string& path,
+    const std::size_t& offset_in_file,
+    const std::size_t& item_size,
+    const bool& repeat)
+    : path_(path),
+      file_(path_),
+      offset_in_file_(offset_in_file),
+      item_size_(item_size),
+      repeat_(repeat),
+      done_(false),
+      io_buffer_size_(item_size * IO_BUFFER_CAPACITY),
+      offset_in_io_buffer_(io_buffer_size_)  // Set to end of buffer so that first look up will trigger a read.
+{
+    file_.seekg(offset_in_file_, std::ios_base::beg);
+
+    io_buffer_.resize(io_buffer_size_);
+}
+
+void ExtraDataFile::reset()
+{
+    file_.seekg(offset_in_file_, std::ios_base::beg);
+    offset_in_io_buffer_ = io_buffer_size_;
+    done_ = false;
+}
+
+std::vector<uint8_t> ExtraDataFile::read_item()
+{
+    if (offset_in_io_buffer_ >= io_buffer_size_)
+        {
+            if (done_)
+                {
+                    return {};
+                }
+            else
+                {
+                    read_into_io_buffer();
+                }
+        }
+
+    std::vector<uint8_t> item_buf{};
+    read_into_item_buffer(item_buf);
+
+    return item_buf;
+}
+
+void ExtraDataFile::read_into_io_buffer()
+{
+    file_.read(reinterpret_cast<char*>(&io_buffer_[0]), io_buffer_size_);
+    const std::size_t bytes_read = file_.gcount();
+
+    if (bytes_read < io_buffer_size_)
+        {
+            if (repeat_)
+                {
+                    reset();
+                    file_.read(reinterpret_cast<char*>(&io_buffer_[bytes_read]), io_buffer_size_ - bytes_read);
+                }
+            else
+                {
+                    io_buffer_size_ = bytes_read;
+                    done_ = true;
+                }
+        }
+
+    offset_in_io_buffer_ = 0;
+}
+
+void ExtraDataFile::read_into_item_buffer(std::vector<uint8_t>& item_buf)
+{
+    item_buf.resize(item_size_);
+    std::memcpy(item_buf.data(), &io_buffer_[offset_in_io_buffer_], item_size_);
+    offset_in_io_buffer_ += item_size_;
+}

src/algorithms/signal_source/libs/extra_data_file.h

@@ -0,0 +1,69 @@
+/*!
+ * \file extra_data_file.h
+ * \brief  Provides a simple abstraction for reading contiguous binary data from a file
+ * \author Victor Castillo, 2024. victorcastilloaguero(at).gmail.es
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
+ * This file is part of GNSS-SDR.
+ *
+ * Copyright (C) 2010-2021  (see AUTHORS file for a list of contributors)
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -----------------------------------------------------------------------------
+ */
+
+
+#ifndef GNSS_SDR_EXTRA_DATA_FILE_H
+#define GNSS_SDR_EXTRA_DATA_FILE_H
+
+#include <cstddef>  // for size_t
+#include <cstdint>
+#include <fstream>
+#include <string>
+#include <vector>
+
+/** \addtogroup Signal_Source
+ * \{ */
+/** \addtogroup Signal_Source_libs
+ * \{ */
+
+
+class ExtraDataFile
+{
+    static constexpr std::size_t IO_BUFFER_CAPACITY = 1024;
+
+public:
+    ExtraDataFile(
+        const std::string& path,
+        const std::size_t& offset_in_file,
+        const std::size_t& item_size,
+        const bool& repeat);
+
+
+    void reset();
+
+    std::vector<uint8_t> read_item();
+
+private:
+    void read_into_io_buffer();
+
+    void read_into_item_buffer(std::vector<uint8_t>& item_buf);
+
+private:
+    std::string path_;
+    std::ifstream file_;
+    std::size_t offset_in_file_;
+    std::size_t item_size_;
+    bool repeat_;
+    bool done_;
+
+    std::vector<uint8_t> io_buffer_;
+    std::size_t io_buffer_size_;
+    std::size_t offset_in_io_buffer_;
+};
+
+/** \} */
+/** \} */
+#endif  // GNSS_SDR_EXTRA_DATA_FILE_H

src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.cc

@@ -645,9 +645,17 @@ int gps_l1_ca_telemetry_decoder_gs::general_work(int noutput_items __attribute__
                     current_symbol.Flag_PLL_180_deg_phase_locked = false;
                 }
 
-            // time tags
+            // TODO - Merge these two loops
             std::vector<gr::tag_t> tags_vec;
-            this->get_tags_in_range(tags_vec, 0, this->nitems_read(0), this->nitems_read(0) + 1);
+            // get_tags_in_range(tags_vec, 0, this->nitems_read(0)-1, this->nitems_read(0), pmt::mp("extra_data"));
+            // for (const auto & tag : tags_vec)
+            //     {
+            //         add_item_tag(0, this->nitems_written(0) + 1, tag.key, tag.value);
+            //     }
+            // tags_vec.clear();
+
+            // time tags
+            this->get_tags_in_range(tags_vec, 0, this->nitems_read(0), this->nitems_read(0) + 1, pmt::mp("timetag"));
             for (const auto &it : tags_vec)
                 {
                     try

src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.cc

@@ -2095,6 +2095,16 @@ int dll_pll_veml_tracking::general_work(int noutput_items __attribute__((unused)
                     d_timetag_waiting = false;
                 }
 
+            std::vector<gr::tag_t> tags{};
+            // get_tags_in_window(tags, 0, 0, ninput_items[0], pmt::mp("extra_data"));
+            get_tags_in_range(tags, 0, nitems_read(0) - d_current_prn_length_samples, nitems_read(0), pmt::mp("extra_data"));
+
+            for (const auto &tag : tags)
+                {
+                    add_item_tag(0, this->nitems_written(0) + 1, tag.key, tag.value);
+                    // std::cout << "[ED TAG (TRK)] [" << std::to_string(tag.offset) << "] ";
+                    // std::cout << std::endl;
+                }
             *out[0] = std::move(current_synchro_data);
             return 1;
         }

src/core/libs/gnss_sdr_sample_counter.cc

@@ -154,7 +154,15 @@ int gnss_sdr_sample_counter::work(int noutput_items __attribute__((unused)),
     // *************** time tags ****************
     std::vector<gr::tag_t> tags_vec;
     // notice that nitems_read is updated in decimation blocks after leaving work() with return 1, equivalent to call consume_each
-    this->get_tags_in_range(tags_vec, 0, this->nitems_read(0), this->nitems_read(0) + samples_per_output);
+    this->get_tags_in_range(tags_vec, 0, this->nitems_read(0), this->nitems_read(0) + samples_per_output, pmt::mp("extra_data"));
+    // std::cout << "SAMPLE COUNTER (" << std::to_string(tags_vec.size()) << ")" << std::endl;
+    for (const auto &tag : tags_vec)
+        {
+            add_item_tag(0, this->nitems_written(0) + 1, tag.key, tag.value);
+        }
+
+    tags_vec.clear();
+    this->get_tags_in_range(tags_vec, 0, this->nitems_read(0), this->nitems_read(0) + samples_per_output, pmt::mp("timetag"));
     for (const auto &it : tags_vec)
         {
             try