satdump/plugins/spacex_support/spacex/deframer.h

#pragma once

/*
    A CADU Deframer
*/

#include <vector>
#include <array>
#include <cstdint>

namespace ccsds
{
    namespace ccsds_tm
    {
        /*
    CCSDS Values to use throughout the whole program
*/

        const int CADU_SIZE = 1279;
        const int CADU_ASM_SIZE = 4;
        const uint32_t CADU_ASM = 0x1ACFFC1D;
        const uint32_t CADU_ASM_INV = 0xE53003E2;
        const uint8_t CADU_ASM_1 = 0x1A;
        const uint8_t CADU_ASM_2 = 0xCF;
        const uint8_t CADU_ASM_3 = 0xFC;
        const uint8_t CADU_ASM_4 = 0x1D;

        class CADUDeframer
        {
        private:
            // Main shifter used to locate sync words
            uint32_t shifter;
            // Bit inversion?
            bool bit_inversion;
            // Sync machine state
            int state;
            // Write a frame?
            bool writeFrame;
            // Values used to output a found frame
            int wroteBits, wroteBytes;
            uint8_t outBuffer;
            int skip, errors, good, sep_errors, state_2_bits_count;
            // Output Frame buffer
            std::array<uint8_t, CADU_SIZE> frameBuffer;
            // Found frame count
            int numFrames;

        public:
            CADUDeframer();
            // Get found frame count
            int getFrameCount();
            // Return state
            int getState();
            // Perform deframing
            std::vector<std::array<uint8_t, CADU_SIZE>> work(uint8_t *input, int size);
        };
    }
}