satdump/plugins/eos_support/aqua/module_aqua_db_decoder.cpp

#include "module_aqua_db_decoder.h"
#include "logger.h"
#include "common/codings/reedsolomon/reedsolomon.h"
#include "common/codings/differential/nrzm.h"
#include "imgui/imgui.h"
#include "common/codings/randomization.h"
#include "common/dsp/constellation.h"
#include "common/utils.h"

#define BUFFER_SIZE (1024 * 8 * 8)
#define FRAME_SIZE 1024

namespace aqua
{
    AquaDBDecoderModule::AquaDBDecoderModule(std::string input_file, std::string output_file_hint, nlohmann::json parameters) : ProcessingModule(input_file, output_file_hint, parameters)
    {
        buffer = new uint8_t[BUFFER_SIZE];
        deframer.STATE_SYNCED = 10;
    }

    std::vector<ModuleDataType> AquaDBDecoderModule::getInputTypes()
    {
        return {DATA_FILE, DATA_STREAM};
    }

    std::vector<ModuleDataType> AquaDBDecoderModule::getOutputTypes()
    {
        return {DATA_FILE};
    }

    AquaDBDecoderModule::~AquaDBDecoderModule()
    {
        delete[] buffer;
    }

    void AquaDBDecoderModule::process()
    {
        if (input_data_type == DATA_FILE)
            filesize = getFilesize(d_input_file);
        else
            filesize = 0;
        if (input_data_type == DATA_FILE)
            data_in = std::ifstream(d_input_file, std::ios::binary);
        data_out = std::ofstream(d_output_file_hint + ".cadu", std::ios::binary);
        d_output_files.push_back(d_output_file_hint + ".cadu");

        logger->info("Using input symbols " + d_input_file);
        logger->info("Decoding to " + d_output_file_hint + ".cadu");

        time_t lastTime = 0;

        dsp::constellation_t constellation(dsp::QPSK);
        reedsolomon::ReedSolomon rs(reedsolomon::RS223);

        // I/Q Buffers
        uint8_t decodedBufI[BUFFER_SIZE / 2];
        uint8_t decodedBufQ[BUFFER_SIZE / 2];

        // Final buffer after decoding
        uint8_t finalBuffer[BUFFER_SIZE];

        // 2 NRZ-M Decoders
        diff::NRZMDiff diff1, diff2;

        uint8_t frame_buffer[FRAME_SIZE * 100];

        while (input_data_type == DATA_FILE ? !data_in.eof() : input_active.load())
        {
            // Read buffer
            if (input_data_type == DATA_FILE)
                data_in.read((char *)buffer, BUFFER_SIZE);
            else
                input_fifo->read((uint8_t *)buffer, BUFFER_SIZE);

            // Demodulate QPSK Constellation
            for (int i = 0; i < BUFFER_SIZE / 2; i++)
            {
                uint8_t demod = constellation.soft_demod((int8_t *)&buffer[i * 2]);
                decodedBufI[i] = demod >> 1;
                decodedBufQ[i] = demod & 1;
            }

            diff1.decode_bits(decodedBufI, BUFFER_SIZE / 2);
            diff2.decode_bits(decodedBufQ, BUFFER_SIZE / 2);

            for (int i = 0; i < BUFFER_SIZE / 2; i++)
            {
                finalBuffer[i * 2 + 0] = decodedBufI[i];
                finalBuffer[i * 2 + 1] = decodedBufQ[i];
            }

            int frames = deframer.work(finalBuffer, BUFFER_SIZE, frame_buffer);

            for (int i = 0; i < frames; i++)
            {
                uint8_t *cadu = &frame_buffer[i * FRAME_SIZE];

                // Derand
                derand_ccsds(&cadu[4], FRAME_SIZE - 4);

                // RS Correction
                rs.decode_interlaved(&cadu[4], true, 4, errors);

                // Write it out
                data_out.write((char *)cadu, FRAME_SIZE);
            }

            if (input_data_type == DATA_FILE)
                progress = data_in.tellg();

            if (time(NULL) % 10 == 0 && lastTime != time(NULL))
            {
                lastTime = time(NULL);
                std::string deframer_state = deframer.getState() == deframer.STATE_NOSYNC ? "NOSYNC" : (deframer.getState() == deframer.STATE_SYNCING ? "SYNCING" : "SYNCED");
                logger->info("Progress " + std::to_string(round(((float)progress / (float)filesize) * 1000.0f) / 10.0f) + "%, Deframer : " + deframer_state);
            }
        }

        data_out.close();
        if (output_data_type == DATA_FILE)
            data_in.close();
    }

    void AquaDBDecoderModule::drawUI(bool window)
    {
        ImGui::Begin("Aqua DB Decoder", NULL, window ? NULL : NOWINDOW_FLAGS);

        ImGui::BeginGroup();
        {
            // Constellation
            {
                ImDrawList *draw_list = ImGui::GetWindowDrawList();
                draw_list->AddRectFilled(ImGui::GetCursorScreenPos(),
                                         ImVec2(ImGui::GetCursorScreenPos().x + 200 * ui_scale, ImGui::GetCursorScreenPos().y + 200 * ui_scale),
                                         ImColor::HSV(0, 0, 0));

                for (int i = 0; i < 2048; i++)
                {
                    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),
                                                      ImGui::GetCursorScreenPos().y + (int)(100 * ui_scale + (((int8_t *)buffer)[i * 2 + 1] / 127.0) * 100 * ui_scale) % int(200 * ui_scale)),
                                               2 * ui_scale,
                                               ImColor::HSV(113.0 / 360.0, 1, 1, 1.0));
                }

                ImGui::Dummy(ImVec2(200 * ui_scale + 3, 200 * ui_scale + 3));
            }
        }
        ImGui::EndGroup();

        ImGui::SameLine();

        ImGui::BeginGroup();
        {
            ImGui::Button("Deframer", {200 * ui_scale, 20 * ui_scale});
            {
                ImGui::Text("State : ");

                ImGui::SameLine();

                if (deframer.getState() == deframer.STATE_NOSYNC)
                    ImGui::TextColored(IMCOLOR_NOSYNC, "NOSYNC");
                else if (deframer.getState() == deframer.STATE_SYNCING)
                    ImGui::TextColored(IMCOLOR_SYNCING, "SYNCING");
                else
                    ImGui::TextColored(IMCOLOR_SYNCED, "SYNCED");
            }

            ImGui::Spacing();

            ImGui::Button("Reed-Solomon", {200 * ui_scale, 20 * ui_scale});
            {
                ImGui::Text("RS    : ");
                for (int i = 0; i < 4; i++)
                {
                    ImGui::SameLine();

                    if (errors[i] == -1)
                        ImGui::TextColored(IMCOLOR_NOSYNC, "%i ", i);
                    else if (errors[i] > 0)
                        ImGui::TextColored(IMCOLOR_SYNCING, "%i ", i);
                    else
                        ImGui::TextColored(IMCOLOR_SYNCED, "%i ", i);
                }
            }
        }
        ImGui::EndGroup();

        if (!streamingInput)
            ImGui::ProgressBar((float)progress / (float)filesize, ImVec2(ImGui::GetWindowWidth() - 10, 20 * ui_scale));

        ImGui::End();
    }

    std::string AquaDBDecoderModule::getID()
    {
        return "aqua_db_decoder";
    }

    std::vector<std::string> AquaDBDecoderModule::getParameters()
    {
        return {};
    }

    std::shared_ptr<ProcessingModule> AquaDBDecoderModule::getInstance(std::string input_file, std::string output_file_hint, nlohmann::json parameters)
    {
        return std::make_shared<AquaDBDecoderModule>(input_file, output_file_hint, parameters);
    }
} // namespace aqua