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#include "module_demod_base.h"
#include "logger.h"
#include "imgui/imgui.h"
#include "core/config.h"
#include "common/dsp_source_sink/format_notated.h"
namespace demod
{
BaseDemodModule::BaseDemodModule(std::string input_file, std::string output_file_hint, nlohmann::json parameters) : ProcessingModule(input_file, output_file_hint, parameters),
constellation(100.0f / 127.0f, 100.0f / 127.0f, demod_constellation_size)
{
// Parameters parsing
if (parameters.count("samplerate") > 0)
d_samplerate = parameters["samplerate"].get<long>();
else
throw satdump_exception("Samplerate parameter must be present!");
if (parameters.count("buffer_size") > 0)
d_buffer_size = parameters["buffer_size"].get<long>();
else
d_buffer_size = std::min<int>(dsp::STREAM_BUFFER_SIZE, std::max<int>(8192 + 1, d_samplerate / 200));
if (parameters.count("symbolrate") > 0)
d_symbolrate = parameters["symbolrate"].get<long>();
if (parameters.count("agc_rate") > 0)
d_agc_rate = parameters["agc_rate"].get<float>();
if (parameters.count("dc_block") > 0)
d_dc_block = parameters["dc_block"].get<bool>();
if (parameters.count("freq_shift") > 0)
d_frequency_shift = parameters["freq_shift"].get<long>();
if (parameters.count("iq_swap") > 0)
d_iq_swap = parameters["iq_swap"].get<bool>();
/////////////////////
if (parameters.count("enable_doppler") > 0)
d_doppler_enable = parameters["enable_doppler"].get<bool>();
if (parameters.count("doppler_alpha") > 0)
d_doppler_alpha = parameters["doppler_alpha"].get<float>();
/////////////////////
if (parameters.count("dump_intermediate") > 0)
d_dump_intermediate = parameters["dump_intermediate"].get<std::string>();
snr = 0;
peak_snr = 0;
showWaterfall = satdump::config::main_cfg["user_interface"]["show_waterfall_demod_fft"]["value"].get<bool>();
}
void BaseDemodModule::initb(bool resample_here)
{
if (d_parameters.contains("min_sps"))
MIN_SPS = d_parameters["min_sps"].get<float>();
if (d_parameters.contains("max_sps"))
MAX_SPS = d_parameters["max_sps"].get<float>();
float input_sps = (float)d_samplerate / (float)d_symbolrate; // Compute input SPS
resample = input_sps > MAX_SPS || input_sps < MIN_SPS; // If SPS is out of allowed range, we resample
int range = pow(10, (std::to_string(int(d_symbolrate)).size() - 1)); // Avoid complex resampling
final_samplerate = d_samplerate;
if (d_parameters.count("custom_samplerate") > 0)
final_samplerate = d_parameters["custom_samplerate"].get<long>();
else if (MAX_SPS == MIN_SPS)
final_samplerate = d_symbolrate * MAX_SPS;
else if (input_sps > MAX_SPS)
final_samplerate = resample ? (round(d_symbolrate / range) * range) * MAX_SPS : d_samplerate; // Get the final samplerate we'll be working with
else if (input_sps < MIN_SPS)
final_samplerate = resample ? d_symbolrate * MIN_SPS : d_samplerate; // Get the final samplerate we'll be working with
float decimation_factor = d_samplerate / final_samplerate; // Decimation factor to rescale our input buffer
if (resample)
d_buffer_size *= ceil(decimation_factor);
if (d_buffer_size > 8192 * 20)
d_buffer_size = 8192 * 20;
final_sps = final_samplerate / (float)d_symbolrate;
logger->debug("Input SPS : %f", input_sps);
logger->debug("Resample : " + std::to_string(resample));
logger->debug("Samplerate : %f", final_samplerate);
logger->debug("Dec factor : %f", decimation_factor);
logger->debug("Final SPS : %f", final_sps);
if (input_sps < 1.0)
throw satdump_exception("SPS is invalid. Must be above 1!");
// Init DSP Blocks
if (input_data_type == DATA_FILE)
file_source = std::make_shared<dsp::FileSourceBlock>(d_input_file, d_parameters["baseband_format"].get<std::string>(), d_buffer_size, d_iq_swap);
if (d_dc_block)
dc_blocker = std::make_shared<dsp::CorrectIQBlock<complex_t>>(input_data_type == DATA_DSP_STREAM ? input_stream : file_source->output_stream);
// Cleanup things a bit
std::shared_ptr<dsp::stream<complex_t>> input_data = d_dc_block ? dc_blocker->output_stream : (input_data_type == DATA_DSP_STREAM ? input_stream : file_source->output_stream);
if (d_frequency_shift != 0)
freq_shift = std::make_shared<dsp::FreqShiftBlock>(input_data, d_samplerate, d_frequency_shift);
if (d_doppler_enable)
{
double frequency = -1;
if (d_parameters.count("satellite_frequency"))
frequency = d_parameters["satellite_frequency"].get<double>();
else
throw satdump_exception("Satellite Frequency is required for doppler correction!");
if (d_frequency_shift != 0)
frequency += d_frequency_shift;
int norad = -1;
if (d_parameters.count("satellite_norad"))
norad = d_parameters["satellite_norad"].get<double>();
else
throw satdump_exception("Satellite NORAD is required for doppler correction!");
// QTH, with a way to override it
double qth_lon = 0, qth_lat = 0, qth_alt = 0;
try
{
qth_lon = satdump::config::main_cfg["satdump_general"]["qth_lon"]["value"].get<double>();
qth_lat = satdump::config::main_cfg["satdump_general"]["qth_lat"]["value"].get<double>();
qth_alt = satdump::config::main_cfg["satdump_general"]["qth_alt"]["value"].get<double>();
}
catch (std::exception &)
{
}
if (d_parameters.count("qth_lon"))
qth_lon = d_parameters["qth_lon"].get<double>();
if (d_parameters.count("qth_lat"))
qth_lat = d_parameters["qth_lat"].get<double>();
if (d_parameters.count("qth_alt"))
qth_alt = d_parameters["qth_alt"].get<double>();
doppler_shift = std::make_shared<dsp::DopplerCorrectBlock>(d_frequency_shift != 0 ? freq_shift->output_stream : input_data,
d_samplerate, d_doppler_alpha, frequency, norad,
qth_lon, qth_lat, qth_alt);
if (input_data_type == DATA_FILE)
{
if (d_parameters.count("start_timestamp") > 0)
doppler_shift->start_time = d_parameters["start_timestamp"].get<double>();
else
{
logger->error("Start Timestamp is required for doppler correction! Disabling doppler.");
doppler_shift.reset();
d_doppler_enable = false;
}
}
}
std::shared_ptr<dsp::stream<complex_t>> input_data_final = d_doppler_enable ? doppler_shift->output_stream
: (d_frequency_shift != 0 ? freq_shift->output_stream : input_data);
if (input_data_type == DATA_FILE)
{
fft_splitter = std::make_shared<dsp::SplitterBlock>(input_data_final);
fft_splitter->add_output("fft");
fft_splitter->set_enabled("fft", show_fft);
if (d_dump_intermediate != "")
{
fft_splitter->add_output("intermediate");
fft_splitter->set_enabled("intermediate", true);
intermediate_file_sink = std::make_shared<dsp::FileSinkBlock>(fft_splitter->get_output("intermediate"));
}
fft_proc = std::make_shared<dsp::FFTPanBlock>(fft_splitter->get_output("fft"));
fft_proc->set_fft_settings(8192, final_samplerate, 120);
fft_proc->avg_num = 10;
fft_plot = std::make_shared<widgets::FFTPlot>(fft_proc->output_stream->writeBuf, 8192, -10, 20, 10);
waterfall_plot = std::make_shared<widgets::WaterfallPlot>(8192, 500);
waterfall_plot->set_rate(120, 10);
fft_proc->on_fft = [this](float *v)
{ waterfall_plot->push_fft(v); };
}
std::shared_ptr<dsp::stream<complex_t>> input_data_final_fft = input_data_type == DATA_FILE ? fft_splitter->output_stream : input_data_final;
// Init resampler if required
if (resample && resample_here)
resampler = std::make_shared<dsp::SmartResamplerBlock<complex_t>>(input_data_final_fft, final_samplerate, d_samplerate);
// AGC
agc = std::make_shared<dsp::AGCBlock<complex_t>>((resample && resample_here) ? resampler->output_stream : input_data_final_fft, d_agc_rate, 1.0f, 1.0f, 65536);
}
std::vector<ModuleDataType> BaseDemodModule::getInputTypes()
{
return {DATA_FILE, DATA_DSP_STREAM};
}
std::vector<ModuleDataType> BaseDemodModule::getOutputTypes()
{
return {DATA_FILE, DATA_STREAM};
}
BaseDemodModule::~BaseDemodModule()
{
}
void BaseDemodModule::start()
{
// Start
if (input_data_type == DATA_FILE)
file_source->start();
if (d_dc_block)
dc_blocker->start();
if (d_frequency_shift != 0)
freq_shift->start();
if (d_doppler_enable)
doppler_shift->start();
if (input_data_type == DATA_FILE)
fft_splitter->start();
if (input_data_type == DATA_FILE && d_dump_intermediate != "")
{
intermediate_file_sink->start();
intermediate_file_sink->set_output_sample_type(d_dump_intermediate);
std::string int_file = d_output_file_hint + "_" + std::to_string((uint64_t)d_samplerate) + "_intermediate_iq";
logger->trace("Recording intermediate to " + int_file);
intermediate_file_sink->start_recording(int_file, d_samplerate);
}
if (input_data_type == DATA_FILE)
fft_proc->start();
if (resample && resampler)
resampler->start();
agc->start();
}
void BaseDemodModule::stop()
{
// Stop
if (input_data_type == DATA_FILE)
file_source->stop();
if (d_dc_block)
dc_blocker->stop();
if (d_frequency_shift != 0)
freq_shift->stop();
if (d_doppler_enable)
doppler_shift->stop();
if (input_data_type == DATA_FILE)
fft_splitter->stop();
if (input_data_type == DATA_FILE && d_dump_intermediate != "")
{
intermediate_file_sink->stop_recording();
intermediate_file_sink->stop();
}
if (input_data_type == DATA_FILE)
fft_proc->stop();
if (resample && resampler)
resampler->stop();
agc->stop();
}
void BaseDemodModule::drawUI(bool window)
{
ImGui::Begin(name.c_str(), NULL, window ? 0 : NOWINDOW_FLAGS);
ImGui::BeginGroup();
constellation.draw(); // Constellation
ImGui::EndGroup();
ImGui::SameLine();
ImGui::BeginGroup();
{
// Show SNR information
ImGui::Button("Signal", {200 * ui_scale, 20 * ui_scale});
if (show_freq)
{
ImGui::Text("Freq : ");
ImGui::SameLine();
ImGui::TextColored(style::theme.orange, "%s", format_notated(display_freq, "Hz", 4).c_str());
}
snr_plot.draw(snr, peak_snr);
if (!streamingInput)
if (ImGui::Checkbox("Show FFT", &show_fft))
fft_splitter->set_enabled("fft", show_fft);
}
ImGui::EndGroup();
if (!streamingInput)
ImGui::ProgressBar((double)progress / (double)filesize, ImVec2(ImGui::GetContentRegionAvail().x, 20 * ui_scale));
drawStopButton();
ImGui::End();
drawFFT();
}
void BaseDemodModule::drawFFT()
{
if (show_fft && !streamingInput)
{
ImGui::SetNextWindowSize({400 * (float)ui_scale, (float)(showWaterfall ? 400 : 200) * (float)ui_scale});
if (ImGui::Begin("Baseband FFT", NULL, ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoResize))
{
fft_plot->draw({float(ImGui::GetWindowSize().x - 0), float(ImGui::GetWindowSize().y - 40 * ui_scale) * float(showWaterfall ? 0.5 : 1.0)});
// Find "actual" left edge of FFT, before frequency shift.
// Inset by 10% (819), then account for > 100% freq shifts via modulo
int pos = (abs((float)d_frequency_shift / (float)d_samplerate) * (float)8192) + 819;
pos %= 8192;
// Compute min and max of the middle 80% of original baseband
float min = 1000;
float max = -1000;
for (int i = 0; i < 6554; i++) // 8192 * 80% = 6554
{
if (fft_proc->output_stream->writeBuf[pos] < min)
min = fft_proc->output_stream->writeBuf[pos];
if (fft_proc->output_stream->writeBuf[pos] > max)
max = fft_proc->output_stream->writeBuf[pos];
pos++;
if (pos >= 8192)
pos = 0;
}
waterfall_plot->scale_min = fft_plot->scale_min = fft_plot->scale_min * 0.99 + min * 0.01;
waterfall_plot->scale_max = fft_plot->scale_max = fft_plot->scale_max * 0.99 + max * 0.01;
if (showWaterfall)
waterfall_plot->draw({ImGui::GetWindowSize().x - 0, (float)(ImGui::GetWindowSize().y - 45 * ui_scale) / 2});
}
ImGui::End();
}
}
void BaseDemodModule::drawStopButton()
{
if (input_data_type != DATA_FILE)
return;
if (ImGui::IsWindowHovered(ImGuiHoveredFlags_AllowWhenBlockedByActiveItem))
{
ImGuiStyle &style = ImGui::GetStyle();
ImVec2 cur_pos = ImGui::GetCursorPos();
cur_pos.x = ImGui::GetContentRegionMax().x - ImGui::CalcTextSize("Abort").x - style.FramePadding.x * 2.0f;
cur_pos.y -= 20.0f * ui_scale + style.ItemSpacing.y;
ImGui::SetCursorPos(cur_pos);
ImGui::PushStyleColor(ImGuiCol_Button, style::theme.red.Value);
if (ImGui::Button("Abort##demodstop", ImVec2(0.0f, 20.0f * ui_scale)))
demod_should_stop = true;
ImGui::PopStyleColor();
if (ImGui::IsItemHovered())
ImGui::SetTooltip("This Abort button will simulate the \ndemodulation being finished. \nProcessing will carry on!");
}
}
std::vector<std::string> BaseDemodModule::getParameters()
{
return {"samplerate", "symbolrate", "agc_rate", "iq_swap", "buffer_size", "dc_block", "baseband_format"};
}
}
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