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#include "module_ccsds_ldpc_decoder.h"
#include "logger.h"
#include "common/widgets/themed_widgets.h"
#include "common/codings/randomization.h"
#include "common/utils.h"
#include "common/codings/rotation.h"
#include "core/exception.h"
namespace ccsds
{
CCSDSLDPCDecoderModule::CCSDSLDPCDecoderModule(std::string input_file, std::string output_file_hint, nlohmann::json parameters)
: ProcessingModule(input_file, output_file_hint, parameters),
is_ccsds(parameters.count("ccsds") > 0 ? parameters["ccsds"].get<bool>() : true),
d_constellation_str(parameters["constellation"].get<std::string>()),
// d_iq_invert(parameters.count("iq_invert") > 0 ? parameters["iq_invert"].get<bool>() : false),
d_derand(parameters.count("derandomize") > 0 ? parameters["derandomize"].get<bool>() : true),
d_ldpc_rate_str(parameters["ldpc_rate"].get<std::string>()),
d_ldpc_block_size(parameters.count("ldpc_block_size") > 0 ? parameters["ldpc_block_size"].get<int>() : 0),
d_ldpc_iterations(parameters["ldpc_iterations"].get<int>()),
d_internal_stream(parameters.count("internal_stream") > 0 ? parameters["internal_stream"].get<bool>() : false),
d_cadu_size(parameters.count("internal_stream") > 0 ? parameters["internal_cadu_size"].get<int>() : 0),
d_cadu_bytes(ceil(d_cadu_size / 8.0)) // If we can't use complete bytes, add one and padding
{
// Get constellation
if (d_constellation_str == "bpsk")
d_constellation = dsp::BPSK;
else if (d_constellation_str == "qpsk")
d_constellation = dsp::QPSK;
else if (d_constellation_str == "oqpsk")
d_constellation = dsp::OQPSK;
else
throw satdump_exception("CCSDS LDPC Decoder : invalid constellation type!");
// Parse LDPC settings
d_ldpc_rate = codings::ldpc::ldpc_rate_from_string(d_ldpc_rate_str);
ldpc_dec = std::make_unique<codings::ldpc::CCSDSLDPC>(d_ldpc_rate, d_ldpc_block_size);
d_ldpc_simd = ldpc_dec->simd();
if (d_ldpc_rate == codings::ldpc::RATE_7_8)
d_ldpc_asm_size = 32;
else
d_ldpc_asm_size = 64;
d_ldpc_frame_size = ldpc_dec->frame_length() + d_ldpc_asm_size;
d_ldpc_codeword_size = ldpc_dec->frame_length();
d_ldpc_data_size = ldpc_dec->data_length();
correlator = std::make_unique<CorrelatorGeneric>(d_constellation,
d_ldpc_rate == codings::ldpc::RATE_7_8 ? unsigned_to_bitvec<uint32_t>(0x1acffc1d)
: unsigned_to_bitvec<uint64_t>(0x034776c7272895b0),
d_ldpc_frame_size);
logger->trace("LDPC Frame size %d, SIMD %d", d_ldpc_frame_size, d_ldpc_simd);
// Parse internal sync marker if set
if (d_internal_stream)
{
uint32_t asm_sync = 0x1acffc1d;
if (parameters.count("internal_asm") > 0)
asm_sync = std::stoul(parameters["internal_asm"].get<std::string>(), nullptr, 16);
deframer = std::make_unique<deframing::BPSK_CCSDS_Deframer>(d_cadu_size, asm_sync);
if (d_cadu_size % 8 != 0) // If this is not a perfect byte length match, pad the frames
{
deframer->CADU_PADDING = d_cadu_size % 8;
logger->info("Frames will be padded!");
}
}
soft_buffer = new int8_t[d_ldpc_frame_size];
frames_in_ldpc_buffer = 0;
ldpc_input_buffer = new int8_t[(d_ldpc_frame_size - d_ldpc_asm_size) * d_ldpc_simd];
ldpc_output_buffer = new uint8_t[(d_ldpc_frame_size - d_ldpc_asm_size) * d_ldpc_simd];
deframer_buffer = new uint8_t[d_ldpc_frame_size * 64];
is_started = true;
}
std::vector<ModuleDataType> CCSDSLDPCDecoderModule::getInputTypes()
{
return {DATA_FILE, DATA_STREAM};
}
std::vector<ModuleDataType> CCSDSLDPCDecoderModule::getOutputTypes()
{
return {DATA_FILE, DATA_STREAM};
}
CCSDSLDPCDecoderModule::~CCSDSLDPCDecoderModule()
{
delete[] soft_buffer;
delete[] deframer_buffer;
delete[] ldpc_input_buffer;
delete[] ldpc_output_buffer;
}
void CCSDSLDPCDecoderModule::process()
{
if (input_data_type == DATA_FILE)
filesize = getFilesize(d_input_file);
else
filesize = 0;
std::string extension = is_ccsds ? ".cadu" : ".frm";
if (input_data_type == DATA_FILE)
data_in = std::ifstream(d_input_file, std::ios::binary);
if (output_data_type == DATA_FILE)
data_out = std::ofstream(d_output_file_hint + extension, std::ios::binary);
d_output_files.push_back(d_output_file_hint + extension);
logger->info("Using input symbols " + d_input_file);
logger->info("Decoding to " + d_output_file_hint + extension);
time_t lastTime = 0;
phase_t phase;
bool swap;
while (input_data_type == DATA_FILE ? !data_in.eof() : input_active.load())
{
// Read a buffer
if (input_data_type == DATA_FILE)
data_in.read((char *)soft_buffer, d_ldpc_frame_size);
else
input_fifo->read((uint8_t *)soft_buffer, d_ldpc_frame_size);
// if (d_iq_invert)
// rotate_soft((int8_t *)soft_buffer, d_ldpc_frame_size, PHASE_0, true);
int pos = correlator->correlate((int8_t *)soft_buffer, phase, swap, correlator_cor, d_ldpc_frame_size);
correlator_locked = pos == 0; // Update locking state
if (pos != 0 && pos < d_ldpc_frame_size) // Safety
{
memmove(soft_buffer, &soft_buffer[pos], d_ldpc_frame_size - pos);
if (input_data_type == DATA_FILE)
data_in.read((char *)&soft_buffer[d_ldpc_frame_size - pos], pos);
else
input_fifo->read((uint8_t *)&soft_buffer[d_ldpc_frame_size - pos], pos);
}
// Correct phase ambiguity
if (d_constellation == dsp::OQPSK)
{
rotate_soft((int8_t *)soft_buffer, d_ldpc_frame_size, phase, false);
if (swap)
{
int8_t last_q_oqpsk = 0;
for (int i = (d_ldpc_frame_size / 2) - 1; i >= 0; i--)
{
int8_t back = soft_buffer[i * 2 + 1];
soft_buffer[i * 2 + 1] = last_q_oqpsk;
last_q_oqpsk = back;
}
}
}
else
{
rotate_soft((int8_t *)soft_buffer, d_ldpc_frame_size, phase, swap);
}
// Derand
if (d_derand)
derand_ccsds_soft(&soft_buffer[d_ldpc_asm_size], d_ldpc_codeword_size - d_ldpc_asm_size);
// LDPC Decoding
memcpy(&ldpc_input_buffer[frames_in_ldpc_buffer * d_ldpc_codeword_size], &soft_buffer[d_ldpc_asm_size], d_ldpc_codeword_size);
frames_in_ldpc_buffer++;
if (frames_in_ldpc_buffer == d_ldpc_simd)
{
#if 1 // For debug if necessary
ldpc_corr = ldpc_dec->decode(ldpc_input_buffer, ldpc_output_buffer, d_ldpc_iterations);
#else
for (int i = 0; i < d_ldpc_simd * d_ldpc_codeword_size; i++)
ldpc_output_buffer[i] = ldpc_input_buffer[i] > 0;
#endif
if (d_internal_stream)
{
for (int i = 0; i < d_ldpc_simd; i++)
{
// Deframe
int frames = deframer->work(&ldpc_output_buffer[i * d_ldpc_codeword_size], d_ldpc_data_size, deframer_buffer);
for (int i = 0; i < frames; i++)
data_out.write((char *)&deframer_buffer[i * d_cadu_bytes], d_cadu_bytes);
}
}
else
{
// Repack
for (int i = 0; i < d_ldpc_simd * d_ldpc_codeword_size; i++)
deframer_buffer[i / 8] = deframer_buffer[i / 8] << 1 | ldpc_output_buffer[i];
for (int i = 0; i < d_ldpc_simd; i++)
{
// Write directly
if (d_ldpc_asm_size == 32)
{
const uint32_t sync = 0x1acffc1d;
if (output_data_type == DATA_FILE)
data_out.write((char *)&sync, 4);
else
output_fifo->write((uint8_t *)&sync, 4);
}
else if (d_ldpc_asm_size == 64)
{
const uint64_t sync = 0x034776c7272895b0;
for (int i = 7; i >= 0; i--)
{
uint8_t v = (sync >> i * 8) & 0xFF;
if (output_data_type == DATA_FILE)
data_out.write((char *)&v, 1);
else
output_fifo->write((uint8_t *)&v, 1);
}
}
if (output_data_type == DATA_FILE)
data_out.write((char *)&deframer_buffer[i * (d_ldpc_codeword_size / 8)], (d_ldpc_frame_size - d_ldpc_asm_size) / 8);
else
output_fifo->write((uint8_t *)&deframer_buffer[i * (d_ldpc_codeword_size / 8)], (d_ldpc_frame_size - d_ldpc_asm_size) / 8);
}
}
frames_in_ldpc_buffer = 0;
}
if (input_data_type == DATA_FILE)
progress = data_in.tellg();
// Update module stats
if (d_internal_stream)
module_stats["deframer_lock"] = deframer->getState() == deframer->STATE_SYNCED;
module_stats["correlator_lock"] = correlator_locked;
module_stats["correlator_corr"] = correlator_cor;
module_stats["ldpc_corr"] = ldpc_corr;
if (time(NULL) % 10 == 0 && lastTime != time(NULL))
{
lastTime = time(NULL);
std::string lock_state = correlator_locked ? "SYNCED" : "NOSYNC";
std::string deframer_state;
if (d_internal_stream)
deframer_state = deframer->getState() == deframer->STATE_NOSYNC ? "NOSYNC" : (deframer->getState() == deframer->STATE_SYNCING ? "SYNCING" : "SYNCED");
logger->info("Progress " + std::to_string(round(((double)progress / (double)filesize) * 1000.0f) / 10.0f) + "%%, Lock : " + lock_state + (d_internal_stream ? (", Deframer : " + deframer_state) : ""));
}
}
if (output_data_type == DATA_FILE)
data_out.close();
if (input_data_type == DATA_FILE)
data_in.close();
}
void CCSDSLDPCDecoderModule::drawUI(bool window)
{
if (!is_started)
return;
ImGui::Begin("CCSDS LDPC Decoder", NULL, window ? 0 : NOWINDOW_FLAGS);
ImGui::BeginGroup();
if (!streamingInput)
{
// Constellation
ImDrawList* draw_list = ImGui::GetWindowDrawList();
ImVec2 rect_min = ImGui::GetCursorScreenPos();
ImVec2 rect_max = { rect_min.x + 200 * ui_scale, rect_min.y + 200 * ui_scale };
draw_list->AddRectFilled(rect_min, rect_max, style::theme.widget_bg);
draw_list->PushClipRect(rect_min, rect_max);
if (d_constellation == dsp::BPSK)
{
for (int i = 0; i < 2048; i++)
{
draw_list->AddCircleFilled(ImVec2(ImGui::GetCursorScreenPos().x + (int)(100 * ui_scale + (((int8_t *)soft_buffer)[i] / 127.0) * 130 * ui_scale) % int(200 * ui_scale),
ImGui::GetCursorScreenPos().y + (int)(100 * ui_scale + rng.gasdev() * 14 * ui_scale) % int(200 * ui_scale)),
2 * ui_scale,
style::theme.constellation);
}
}
else
{
for (int i = 0; i < 2048; i++)
{
draw_list->AddCircleFilled(ImVec2(ImGui::GetCursorScreenPos().x + (int)(100 * ui_scale + (((int8_t *)soft_buffer)[i * 2 + 0] / 127.0) * 100 * ui_scale) % int(200 * ui_scale),
ImGui::GetCursorScreenPos().y + (int)(100 * ui_scale + (((int8_t *)soft_buffer)[i * 2 + 1] / 127.0) * 100 * ui_scale) % int(200 * ui_scale)),
2 * ui_scale,
style::theme.constellation);
}
}
draw_list->PopClipRect();
ImGui::Dummy(ImVec2(200 * ui_scale + 3, 200 * ui_scale + 3));
}
ImGui::EndGroup();
ImGui::SameLine();
ImGui::BeginGroup();
{
ImGui::Button("Correlator", {200 * ui_scale, 20 * ui_scale});
{
ImGui::Text("Corr : ");
ImGui::SameLine();
ImGui::TextColored(correlator_locked ? style::theme.green : style::theme.orange, UITO_C_STR(correlator_cor));
std::memmove(&cor_history[0], &cor_history[1], (200 - 1) * sizeof(float));
cor_history[200 - 1] = correlator_cor;
if (d_ldpc_asm_size == 32)
widgets::ThemedPlotLines(style::theme.plot_bg.Value, "", cor_history, IM_ARRAYSIZE(cor_history), 0, "", 15.0f, 35.0f,
ImVec2(200 * ui_scale, 50 * ui_scale));
else
widgets::ThemedPlotLines(style::theme.plot_bg.Value, "", cor_history, IM_ARRAYSIZE(cor_history), 0, "", 25.0f, 70.0f,
ImVec2(200 * ui_scale, 50 * ui_scale));
}
ImGui::Button("LDPC", {200 * ui_scale, 20 * ui_scale});
{
ImGui::Text("Diff : ");
ImGui::SameLine();
ImGui::TextColored(ldpc_corr > 10 ? style::theme.orange : style::theme.green, UITO_C_STR(ldpc_corr));
std::memmove(&ldpc_history[0], &ldpc_history[1], (200 - 1) * sizeof(float));
ldpc_history[200 - 1] = ldpc_corr;
widgets::ThemedPlotLines(style::theme.plot_bg.Value, "", ldpc_history, IM_ARRAYSIZE(ldpc_history), 0, "", 0.0f, d_ldpc_codeword_size / 20,
ImVec2(200 * ui_scale, 50 * ui_scale));
}
if (d_internal_stream)
{
ImGui::Spacing();
ImGui::Button("Deframer", {200 * ui_scale, 20 * ui_scale});
{
ImGui::Text("State : ");
ImGui::SameLine();
if (deframer->getState() == deframer->STATE_NOSYNC)
ImGui::TextColored(style::theme.red, "NOSYNC");
else if (deframer->getState() == deframer->STATE_SYNCING)
ImGui::TextColored(style::theme.orange, "SYNCING");
else
ImGui::TextColored(style::theme.green, "SYNCED");
}
}
}
ImGui::EndGroup();
if (!streamingInput)
ImGui::ProgressBar((double)progress / (double)filesize, ImVec2(ImGui::GetContentRegionAvail().x, 20 * ui_scale));
ImGui::End();
}
std::string CCSDSLDPCDecoderModule::getID()
{
return "ccsds_ldpc_decoder";
}
std::vector<std::string> CCSDSLDPCDecoderModule::getParameters()
{
return {};
}
std::shared_ptr<ProcessingModule> CCSDSLDPCDecoderModule::getInstance(std::string input_file, std::string output_file_hint, nlohmann::json parameters)
{
return std::make_shared<CCSDSLDPCDecoderModule>(input_file, output_file_hint, parameters);
}
} // namespace npp
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