satdump/tools/nat2pro/msg_nat.cpp

#include "main.h"
#include "products/image_products.h"
#include "common/repack.h"
#include "logger.h"

void decodeMSGNat(std::vector<uint8_t> msg_file, std::string pro_output_file)
{
    uint8_t *buf = msg_file.data();

    // Parse header
    std::string mh_strs[48];
    mh_strs[0] = (char *)buf;
    mh_strs[1] = (char *)buf + 80;
    mh_strs[2] = (char *)buf + 160;
    mh_strs[3] = (char *)buf + 240;
    mh_strs[4] = (char *)buf + 320;
    mh_strs[5] = (char *)buf + 400;
    mh_strs[6] = (char *)buf + 480;
    mh_strs[6] += (char *)buf + 526;
    mh_strs[7] = (char *)buf + 542;
    mh_strs[7] += (char *)buf + 588;
    mh_strs[8] = (char *)buf + 604;
    mh_strs[8] += (char *)buf + 650;
    mh_strs[9] = (char *)buf + 666;
    mh_strs[9] += (char *)buf + 712;
    mh_strs[10] = (char *)buf + 728;
    mh_strs[10] += (char *)buf + 774;
    mh_strs[11] = (char *)buf + 2154;
    mh_strs[12] = (char *)buf + 2234;
    mh_strs[13] = (char *)buf + 2314;
    mh_strs[14] = (char *)buf + 2394;
    mh_strs[15] = (char *)buf + 2474;
    mh_strs[16] = (char *)buf + 2554;
    mh_strs[17] = (char *)buf + 2634;
    mh_strs[18] = (char *)buf + 2714;
    mh_strs[19] = (char *)buf + 2794;
    mh_strs[20] = (char *)buf + 2874;
    mh_strs[21] = (char *)buf + 2954;
    mh_strs[22] = (char *)buf + 3034;
    mh_strs[23] = (char *)buf + 3114;
    mh_strs[24] = (char *)buf + 3194;
    mh_strs[25] = (char *)buf + 3274;
    mh_strs[26] = (char *)buf + 3354;
    mh_strs[27] = (char *)buf + 3434;
    mh_strs[28] = (char *)buf + 3514;
    mh_strs[29] = (char *)buf + 3594;
    mh_strs[30] = (char *)buf + 3674;
    mh_strs[31] = (char *)buf + 3754;
    mh_strs[32] = (char *)buf + 3834;
    mh_strs[33] = (char *)buf + 3914;
    mh_strs[34] = (char *)buf + 3994;
    mh_strs[35] = (char *)buf + 4074;
    mh_strs[36] = (char *)buf + 4154;
    mh_strs[37] = (char *)buf + 4234;
    mh_strs[38] = (char *)buf + 4314;
    mh_strs[39] = (char *)buf + 4394;
    mh_strs[40] = (char *)buf + 4474;
    mh_strs[41] = (char *)buf + 4554;
    mh_strs[42] = (char *)buf + 4634;
    mh_strs[43] = (char *)buf + 4714;
    mh_strs[44] = (char *)buf + 4794;
    mh_strs[45] = (char *)buf + 4874;
    mh_strs[46] = (char *)buf + 4954;
    mh_strs[47] = (char *)buf + 5034;

    for (int i = 0; i < 48; i++)
        logger->debug("L%d %s", i, mh_strs[i].substr(0, mh_strs[i].size() - 1).c_str());

    // IMG Size
    int vis_ir_x_size, vis_ir_y_size;
    int hrv_x_size, hrv_y_size;
    float longitude;
    sscanf(mh_strs[44].c_str(), "NumberLinesVISIR            : %d", &vis_ir_y_size);
    sscanf(mh_strs[45].c_str(), "NumberColumnsVISIR          : %d", &vis_ir_x_size);
    sscanf(mh_strs[46].c_str(), "NumberLinesHRV              : %d", &hrv_y_size);
    sscanf(mh_strs[47].c_str(), "NumberColumnsHRV            : %d", &hrv_x_size);
    sscanf(mh_strs[14].c_str(), "LLOS                        : %f", &longitude);

    logger->warn("VIS/IR Size : %dx%d", vis_ir_x_size, vis_ir_y_size);
    logger->warn("HRV    Size : %dx%d", hrv_x_size, hrv_y_size);
    logger->warn("Longitude   : %f", longitude);

    // Other data
    long int headerpos, datapos, trailerpos;
    sscanf(mh_strs[8].c_str(), "%*s : %*d %ld\n", &headerpos);
    sscanf(mh_strs[9].c_str(), "%*s : %*d %ld\n", &datapos);
    sscanf(mh_strs[10].c_str(), "%*s : %*d %ld\n", &trailerpos);

    char bandsel[16];
    sscanf(mh_strs[39].c_str(), "%*s : %s", bandsel);

    image::Image<uint16_t> vis_ir_imgs[12];
    for (int channel = 0; channel < 12; channel++)
    {
        if (bandsel[channel] != 'X')
            continue;

        vis_ir_imgs[channel].init((channel == 11 ? hrv_x_size : vis_ir_x_size), (channel == 11 ? hrv_y_size : vis_ir_y_size), 1);
    }

    uint16_t repacked_line[81920];

    // Read line data
    // uint8_t pkt_hdr[48];
    uint8_t *data_ptr = buf + datapos;
    for (int line = 0; line < vis_ir_y_size; line++)
    {
        for (int channel = 0; channel < 12; channel++)
        {
            if (bandsel[channel] != 'X')
                continue;

            for (int i = 0; i < (channel == 11 ? 3 : 1); i++)
            {
                // uint16_t seq_cnt = (data_ptr + 16)[0] << 8 | (data_ptr + 16)[1];
                uint32_t pkt_len = (data_ptr + 18)[0] << 24 | (data_ptr + 18)[1] << 16 | (data_ptr + 18)[2] << 8 | (data_ptr + 18)[3];

                // logger->info("PKT %d CHANNEL %d SEQ %d LEN %d", line, channel, seq_cnt, pkt_len);

                int datasize = pkt_len - 15 - 27;

                repackBytesTo10bits(data_ptr + 38 + 27, datasize, repacked_line);

                for (int x = 0; x < (channel == 11 ? hrv_x_size : vis_ir_x_size); x++)
                    vis_ir_imgs[channel][(channel == 11 ? (line * 3 + i) : line) * (channel == 11 ? hrv_x_size : vis_ir_x_size) + x] = repacked_line[x] << 6;

                data_ptr += 38 + 27 + datasize;
            }
        }
    }

    // Saving
    satdump::ImageProducts seviri_products;
    seviri_products.instrument_name = "seviri";
    seviri_products.has_timestamps = false;
    seviri_products.bit_depth = 10;

    nlohmann::json proj_cfg;
    proj_cfg["type"] = "geos";
    proj_cfg["lon"] = longitude;
    proj_cfg["alt"] = 35792.74;
    proj_cfg["scale_x"] = 1.145;
    proj_cfg["scale_y"] = 1.145;
    proj_cfg["offset_x"] = -0.0005;
    proj_cfg["offset_y"] = 0.0005;
    proj_cfg["sweep_x"] = false;
    seviri_products.set_proj_cfg(proj_cfg);

    for (int channel = 0; channel < 12; channel++)
    {
        if (bandsel[channel] != 'X')
            continue;
        vis_ir_imgs[channel].mirror(true, true);
        seviri_products.images.push_back({"SEVIRI-" + std::to_string(channel + 1), std::to_string(channel + 1), vis_ir_imgs[channel]});
    }

    if (!std::filesystem::exists(pro_output_file))
        std::filesystem::create_directories(pro_output_file);
    seviri_products.save(pro_output_file);

    // Write composite
    std::string path = "SEVIRI_321";
    image::Image<uint16_t> compo_321(vis_ir_x_size, vis_ir_y_size, 3);

    compo_321.draw_image(0, vis_ir_imgs[2]);
    compo_321.draw_image(1, vis_ir_imgs[1]);
    compo_321.draw_image(2, vis_ir_imgs[0]);

    logger->info("Saving " + path);
    compo_321.save_png(path + ".png");
}