mirror of
https://github.com/SatDump/SatDump
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262 lines
No EOL
10 KiB
C++
262 lines
No EOL
10 KiB
C++
#include "module_xrit_decoder.h"
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#include "logger.h"
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#include "common/sathelper/correlator.h"
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#include "common/sathelper/packetfixer.h"
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#include "common/sathelper/derandomizer.h"
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#include "common/codings/differential/nrzm.h"
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#include "imgui/imgui.h"
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#include "common/codings/viterbi/viterbi27.h"
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#include "common/codings/correlator.h"
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#include "common/codings/reedsolomon/reedsolomon.h"
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#define FRAME_SIZE 1024
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#define ENCODED_FRAME_SIZE 1024 * 8 * 2
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// Return filesize
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size_t getFilesize(std::string filepath);
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namespace xrit
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{
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XRITDecoderModule::XRITDecoderModule(std::string input_file, std::string output_file_hint, std::map<std::string, std::string> parameters) : ProcessingModule(input_file, output_file_hint, parameters),
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is_bpsk(std::stoi(parameters["is_bpsk"])),
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diff_decode(std::stoi(parameters["diff_decode"])),
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viterbi(ENCODED_FRAME_SIZE / 2, viterbi::CCSDS_R2_K7_POLYS)
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{
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buffer = new uint8_t[ENCODED_FRAME_SIZE];
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}
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std::vector<ModuleDataType> XRITDecoderModule::getInputTypes()
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{
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return {DATA_FILE, DATA_STREAM};
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}
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std::vector<ModuleDataType> XRITDecoderModule::getOutputTypes()
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{
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return {DATA_FILE};
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}
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XRITDecoderModule::~XRITDecoderModule()
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{
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delete[] buffer;
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}
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void XRITDecoderModule::process()
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{
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if (input_data_type == DATA_FILE)
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filesize = getFilesize(d_input_file);
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else
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filesize = 0;
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if (input_data_type == DATA_FILE)
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data_in = std::ifstream(d_input_file, std::ios::binary);
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if (output_data_type == DATA_FILE)
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{
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data_out = std::ofstream(d_output_file_hint + ".cadu", std::ios::binary);
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d_output_files.push_back(d_output_file_hint + ".cadu");
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}
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logger->info("Using input symbols " + d_input_file);
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logger->info("Decoding to " + d_output_file_hint + ".cadu");
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time_t lastTime = 0;
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// Correlator
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Correlator correlator(is_bpsk ? BPSK : QPSK, diff_decode ? 0xfc4ef4fd0cc2df89 : 0xfca2b63db00d9794);
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// Viterbi, rs, etc
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sathelper::PacketFixer packetFixer;
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sathelper::Derandomizer derand;
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reedsolomon::ReedSolomon rs(reedsolomon::RS223);
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// Other buffers
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uint8_t frameBuffer[FRAME_SIZE];
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phase_t phase;
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bool swap;
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// Vectors are inverted
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diff::NRZMDiff diff;
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while (input_data_type == DATA_FILE ? !data_in.eof() : input_active.load())
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{
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// Read a buffer
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if (input_data_type == DATA_FILE)
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data_in.read((char *)buffer, ENCODED_FRAME_SIZE);
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else
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input_fifo->read((uint8_t *)buffer, ENCODED_FRAME_SIZE);
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int pos = correlator.correlate((int8_t *)buffer, phase, swap, cor, ENCODED_FRAME_SIZE);
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locked = pos == 0; // Update locking state
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if (pos != 0 && pos < ENCODED_FRAME_SIZE) // Safety
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{
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std::memmove(buffer, &buffer[pos], pos);
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if (input_data_type == DATA_FILE)
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data_in.read((char *)&buffer[ENCODED_FRAME_SIZE - pos], pos);
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else
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input_fifo->read((uint8_t *)&buffer[ENCODED_FRAME_SIZE - pos], pos);
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}
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// Correct phase ambiguity
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if (is_bpsk) // BPSK
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packetFixer.fixPacket(buffer, ENCODED_FRAME_SIZE, (sathelper::PhaseShift)(phase + 2), swap);
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else // QPSK
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packetFixer.fixPacket(buffer, ENCODED_FRAME_SIZE, (sathelper::PhaseShift)phase, swap);
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// Viterbi
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viterbi.work((int8_t *)buffer, frameBuffer);
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// NRZ-M Decoding
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if (diff_decode)
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diff.decode(frameBuffer, FRAME_SIZE);
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// Derandomize that frame
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derand.work(&frameBuffer[4], FRAME_SIZE - 4);
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// RS Correction
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rs.decode_interlaved(&frameBuffer[4], true, 4, errors);
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// Write it out if it's not garbage
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if (errors[0] >= 0 && errors[1] >= 0 && errors[2] >= 0 && errors[3] >= 0)
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{
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frameBuffer[0] = 0x1a;
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frameBuffer[1] = 0xcf;
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frameBuffer[2] = 0xfc;
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frameBuffer[3] = 0x1d;
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if (output_data_type == DATA_FILE)
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data_out.write((char *)frameBuffer, FRAME_SIZE);
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else
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output_fifo->write(frameBuffer, FRAME_SIZE);
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}
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if (input_data_type == DATA_FILE)
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progress = data_in.tellg();
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if (time(NULL) % 10 == 0 && lastTime != time(NULL))
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{
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lastTime = time(NULL);
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std::string lock_state = locked ? "SYNCED" : "NOSYNC";
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logger->info("Progress " + std::to_string(round(((float)progress / (float)filesize) * 1000.0f) / 10.0f) + "%, Viterbi BER : " + std::to_string(viterbi.ber() * 100) + "%, Lock : " + lock_state);
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}
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}
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if (output_data_type == DATA_FILE)
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data_out.close();
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if (input_data_type == DATA_FILE)
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data_in.close();
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}
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void XRITDecoderModule::drawUI(bool window)
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{
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ImGui::Begin("xRIT Decoder", NULL, window ? NULL : NOWINDOW_FLAGS);
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float ber = viterbi.ber();
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ImGui::BeginGroup();
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{
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// Constellation
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{
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ImDrawList *draw_list = ImGui::GetWindowDrawList();
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draw_list->AddRectFilled(ImGui::GetCursorScreenPos(),
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ImVec2(ImGui::GetCursorScreenPos().x + 200 * ui_scale, ImGui::GetCursorScreenPos().y + 200 * ui_scale),
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ImColor::HSV(0, 0, 0));
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if (is_bpsk)
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{
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for (int i = 0; i < 2048; i++)
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{
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draw_list->AddCircleFilled(ImVec2(ImGui::GetCursorScreenPos().x + (int)(100 * ui_scale + (((int8_t *)buffer)[i] / 127.0) * 130 * ui_scale) % int(200 * ui_scale),
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ImGui::GetCursorScreenPos().y + (int)(100 * ui_scale + rng.gasdev() * 14 * ui_scale) % int(200 * ui_scale)),
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2 * ui_scale,
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ImColor::HSV(113.0 / 360.0, 1, 1, 1.0));
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}
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}
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else
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{
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for (int i = 0; i < 2048; i++)
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{
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draw_list->AddCircleFilled(ImVec2(ImGui::GetCursorScreenPos().x + (int)(100 * ui_scale + (((int8_t *)buffer)[i * 2 + 0] / 127.0) * 100 * ui_scale) % int(200 * ui_scale),
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ImGui::GetCursorScreenPos().y + (int)(100 * ui_scale + (((int8_t *)buffer)[i * 2 + 1] / 127.0) * 100 * ui_scale) % int(200 * ui_scale)),
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2 * ui_scale,
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ImColor::HSV(113.0 / 360.0, 1, 1, 1.0));
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}
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}
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ImGui::Dummy(ImVec2(200 * ui_scale + 3, 200 * ui_scale + 3));
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}
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}
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ImGui::EndGroup();
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ImGui::SameLine();
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ImGui::BeginGroup();
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{
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ImGui::Button("Correlator", {200 * ui_scale, 20 * ui_scale});
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{
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ImGui::Text("Corr : ");
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ImGui::SameLine();
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ImGui::TextColored(locked ? IMCOLOR_SYNCED : IMCOLOR_SYNCING, UITO_C_STR(cor));
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std::memmove(&cor_history[0], &cor_history[1], (200 - 1) * sizeof(float));
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cor_history[200 - 1] = cor;
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ImGui::PlotLines("", cor_history, IM_ARRAYSIZE(cor_history), 0, "", 40.0f, 64.0f, ImVec2(200 * ui_scale, 50 * ui_scale));
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}
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ImGui::Spacing();
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ImGui::Button("Viterbi", {200 * ui_scale, 20 * ui_scale});
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{
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ImGui::Text("BER : ");
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ImGui::SameLine();
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ImGui::TextColored(ber < 0.22 ? IMCOLOR_SYNCED : IMCOLOR_NOSYNC, UITO_C_STR(ber));
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std::memmove(&ber_history[0], &ber_history[1], (200 - 1) * sizeof(float));
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ber_history[200 - 1] = ber;
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ImGui::PlotLines("", ber_history, IM_ARRAYSIZE(ber_history), 0, "", 0.0f, 1.0f, ImVec2(200 * ui_scale, 50 * ui_scale));
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}
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ImGui::Spacing();
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ImGui::Button("Reed-Solomon", {200 * ui_scale, 20 * ui_scale});
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{
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ImGui::Text("RS : ");
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for (int i = 0; i < 4; i++)
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{
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ImGui::SameLine();
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if (errors[i] == -1)
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ImGui::TextColored(IMCOLOR_NOSYNC, "%i ", i);
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else if (errors[i] > 0)
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ImGui::TextColored(IMCOLOR_SYNCING, "%i ", i);
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else
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ImGui::TextColored(IMCOLOR_SYNCED, "%i ", i);
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}
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}
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}
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ImGui::EndGroup();
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if (!streamingInput)
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ImGui::ProgressBar((float)progress / (float)filesize, ImVec2(ImGui::GetWindowWidth() - 10, 20 * ui_scale));
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ImGui::End();
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}
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std::string XRITDecoderModule::getID()
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{
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return "xrit_decoder";
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}
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std::vector<std::string> XRITDecoderModule::getParameters()
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{
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return {"is_bpsk", "diff_decode"};
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}
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std::shared_ptr<ProcessingModule> XRITDecoderModule::getInstance(std::string input_file, std::string output_file_hint, std::map<std::string, std::string> parameters)
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{
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return std::make_shared<XRITDecoderModule>(input_file, output_file_hint, parameters);
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}
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} |