mirror of
https://github.com/SatDump/SatDump
synced 2026-08-13 17:47:30 -04:00
124 lines
3.9 KiB
C++
124 lines
3.9 KiB
C++
#include "module_ax25_decoder.h"
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#include "common/utils.h"
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#include "imgui/imgui.h"
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#include "logger.h"
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#include "common/codings/deframing/hdlc_def.h"
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#include "common/codings/differential/nrzi.h"
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#include "common/codings/lfsr.h"
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#include <cstdint>
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namespace ax25
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{
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AX25DecoderModule::AX25DecoderModule(std::string input_file, std::string output_file_hint, nlohmann::json parameters)
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: satdump::pipeline::base::FileStreamToFileStreamModule(input_file, output_file_hint, parameters)
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{
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input_buffer = new int8_t[256];
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d_nrzi = parameters.contains("nrzi") ? parameters["nrzi"].get<bool>() : false;
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d_g3ruh = parameters.contains("g3ruh") ? parameters["g3ruh"].get<bool>() : false;
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fsfsm_file_ext = ".frm";
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}
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AX25DecoderModule::~AX25DecoderModule() { delete[] input_buffer; }
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void AX25DecoderModule::process()
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{
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diff::NRZIDiff nrzi_decoder;
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common::lfsr g3rhu_descramble(0x21, 0x0, 16);
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HDLCDeframer hdlc_deframer(d_parameters["min_sz"].get<int>(), d_parameters["max_sz"].get<int>());
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uint8_t bits_buf[256];
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while (should_run())
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{
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// Read buffer
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read_data((uint8_t *)input_buffer, 256);
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// Slice
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for (int i = 0; i < 256; i++)
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bits_buf[i] = input_buffer[i] > 0;
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// Optional NRZ-I
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if (d_nrzi)
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nrzi_decoder.decode_bits(bits_buf, 256);
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// Optional G3RUH
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for (int i = 0; i < 256; i++)
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bits_buf[i] = g3rhu_descramble.next_bit_descramble(bits_buf[i]);
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// Deframe
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auto frames = hdlc_deframer.work(bits_buf, 256);
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for (auto frm : frames)
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{
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std::string source_callsign;
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for (int i = 0; i < 6; i++)
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source_callsign += frm[i] >> 1;
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std::string destination_callsign;
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for (int i = 7; i < 7 + 6; i++)
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destination_callsign += frm[i] >> 1;
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int source_ssid = frm[6] >> 1;
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int target_ssid = frm[7 + 6] >> 1;
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int ctrl = frm[14];
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int pid = frm[15];
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logger->trace("AX.25 Frame - SRC : " + source_callsign + ",%d DST : " + destination_callsign + ",%d CTRL : %d PID : %d", source_ssid, target_ssid, ctrl, pid);
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// Add a custom header to ease up forwarding to the next stuff
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uint16_t pkt_sz = frm.size();
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uint8_t buffer_sz[6];
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buffer_sz[0] = 0x1a;
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buffer_sz[1] = 0xcf;
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buffer_sz[2] = 0xfc;
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buffer_sz[3] = 0x1d;
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buffer_sz[4] = pkt_sz >> 8;
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buffer_sz[5] = pkt_sz & 0xFF;
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frm.insert(frm.begin(), buffer_sz, buffer_sz + 6);
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write_data((uint8_t *)frm.data(), frm.size());
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frm_cnt++;
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}
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}
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logger->info("Decoding finished");
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cleanup();
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}
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nlohmann::json AX25DecoderModule::getModuleStats()
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{
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auto v = satdump::pipeline::base::FileStreamToFileStreamModule::getModuleStats();
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v["frm_cnt"] = frm_cnt;
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return v;
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}
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void AX25DecoderModule::drawUI(bool window)
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{
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ImGui::Begin("AX-25 Decoder", NULL, window ? 0 : NOWINDOW_FLAGS);
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ImGui::Button("Deframer", {200 * ui_scale, 20 * ui_scale});
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{
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ImGui::Text("Frames : ");
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ImGui::SameLine();
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ImGui::TextColored(style::theme.green, UITO_C_STR(frm_cnt));
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}
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drawProgressBar();
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ImGui::End();
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}
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std::string AX25DecoderModule::getID() { return "ax25_decoder"; }
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std::shared_ptr<satdump::pipeline::ProcessingModule> AX25DecoderModule::getInstance(std::string input_file, std::string output_file_hint, nlohmann::json parameters)
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{
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return std::make_shared<AX25DecoderModule>(input_file, output_file_hint, parameters);
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}
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} // namespace ax25
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