racerxdl / decoder.c

#include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <unistd.h> #include <time.h> #include <math.h> #include <memory.h> #include <limits.h> #include <sys/time.h> #include <sys/resource.h> #include <fec.h> #include "random/pn.h" static const unsigned char BitsSetTable256[256] = { # define B2(n) n, n+1, n+1, n+2 # define B4(n) B2(n), B2(n+1), B2(n+1), B2(n+2) # define B6(n) B4(n), B4(n+1), B4(n+1), B4(n+2) B6(0), B6(1), B6(1), B6(2) }; // Header, because I don't want an extra file #define FRAMESIZE 1024 #define SYNCWORDSIZE 32 #define MINCORRELATIONBITS 46 #define FRAMEBITS (FRAMESIZE * 8) #define RSBLOCKS 4 #define RSPARITYSIZE 32 #define RSPARITYBLOCK (RSPARITYSIZE * RSBLOCKS) #define VITPOLYA 0x4F #define VITPOLYB 0x6D #define CHECK_VITERBI_CORRECTIONS #define CODEDFRAMESIZE (FRAMEBITS * 2) #define SYNCWORDSIZEDOUBLE (SYNCWORDSIZE * 2) #define PARITY_OFFSET 892 const uint64_t UW0 = 0xfca2b63db00d9794; const uint64_t UW2 = 0x035d49c24ff2686b; const uint64_t REVUW0 = 0xfc51793e700e6b68; const uint64_t REVUW2 = 0x03ae86c18ff19497; typedef struct { uint32_t uw0mc; uint32_t uw0p; uint32_t uw2mc; uint32_t uw2p; uint32_t ruw0mc; uint32_t ruw0p; uint32_t ruw2mc; uint32_t ruw2p; } correlation_t ; uint8_t UW0b[SYNCWORDSIZE * 2]; uint8_t UW2b[SYNCWORDSIZE * 2]; uint8_t REVUW0b[SYNCWORDSIZE * 2]; uint8_t REVUW2b[SYNCWORDSIZE * 2]; uint8_t codedData[CODEDFRAMESIZE]; uint8_t decodedData[FRAMESIZE]; uint8_t correctedData[CODEDFRAMESIZE]; uint8_t rsCorrectedData[FRAMESIZE]; uint8_t rsWorkBuffer[255]; uint8_t M_PDU[886]; int viterbiPolynomial[2] = {VITPOLYA, VITPOLYB}; void initUW(); void checkCorrelation(uint8_t *buffer, int buffLength, correlation_t *corr); void resetCorrelation(correlation_t * corr); uint32_t hardCorrelate(uint8_t dataByte, uint8_t wordByte); void fixPacket(uint8_t *buffer, int buffLength, uint8_t n); void convEncode(uint8_t *data, int dataLength, uint8_t *output, int outputLen); uint32_t calculateError(uint8_t *original, uint8_t *corrected, int length); void deinterleaveRS(uint8_t *data, uint8_t *rsbuff, uint8_t pos, uint8_t I); void interleaveRS(uint8_t *idata, uint8_t *outbuff, uint8_t pos, uint8_t I); void writeChannel(uint8_t *data, int size, uint16_t vcid); // Code uint32_t swapEndianess(uint32_t num) { return ((num>>24)&0xff) | ((num<<8)&0xff0000) | ((num>>8)&0xff00) | ((num<<24)&0xff000000); } uint32_t maxCorrelation(uint32_t a, uint32_t b, uint32_t c, uint32_t d) { uint32_t f = (a > b ? a : b); uint32_t g = (c > d ? c : d); return f > g ? f : g; } void initUW() { printf("Converting Sync Words to Soft Data\n"); for (int i = 0; i < SYNCWORDSIZEDOUBLE; i++) { UW0b[i] = (UW0 >> (SYNCWORDSIZEDOUBLE-i-1)) & 1 ? 0xFF : 0x00; UW2b[i] = (UW2 >> (SYNCWORDSIZEDOUBLE-i-1)) & 1 ? 0xFF : 0x00; REVUW0b[i] = (REVUW0 >> (SYNCWORDSIZEDOUBLE-i-1)) & 1 ? 0xFF : 0x00; REVUW2b[i] = (REVUW2 >> (SYNCWORDSIZEDOUBLE-i-1)) & 1 ? 0xFF : 0x00; } } uint32_t hardCorrelate(uint8_t dataByte, uint8_t wordByte) { //1 if (a > 127 and b == 255) or (a < 127 and b == 0) else 0 return (dataByte >= 127 & wordByte == 0) | (dataByte < 127 & wordByte == 255); } void checkCorrelation(uint8_t *buffer, int buffLength, correlation_t *corr) { resetCorrelation(corr); for (int i = 0; i < buffLength - SYNCWORDSIZEDOUBLE; i++) { uint32_t uw0c = 0; uint32_t uw2c = 0; uint32_t ruw0c = 0; uint32_t ruw2c = 0; for (int k = 0; k < SYNCWORDSIZEDOUBLE; k++) { uw0c += hardCorrelate(buffer[i+k], UW0b[k]); uw2c += hardCorrelate(buffer[i+k], UW2b[k]); ruw0c += hardCorrelate(buffer[i+k], REVUW0b[k]); ruw2c += hardCorrelate(buffer[i+k], REVUW2b[k]); } corr->uw0p = uw0c > corr->uw0mc ? i : corr->uw0p; corr->uw2p = uw2c > corr->uw2mc ? i : corr->uw2p; corr->ruw0p = ruw0c > corr->ruw0mc ? i : corr->ruw0p; corr->ruw2p = ruw2c > corr->ruw2mc ? i : corr->ruw2p; corr->uw0mc = uw0c > corr->uw0mc ? uw0c : corr->uw0mc; corr->uw2mc = uw2c > corr->uw2mc ? uw2c : corr->uw2mc; corr->ruw0mc = ruw0c > corr->ruw0mc ? ruw0c : corr->ruw0mc; corr->ruw2mc = ruw2c > corr->ruw2mc ? ruw2c : corr->ruw2mc; } } void resetCorrelation(correlation_t * corr) { memset(corr, 0x00, sizeof(correlation_t)); } void fixPacket(uint8_t *buffer, int buffLength, uint8_t n) { if (n != 0) { for (int i=0; i < buffLength; i+=2) { if (n % 2) { // Process IQ Inversion char a = buffer[i]; buffer[i] = buffer[i+1]; buffer[i+1] = a; } if (n >= 4) { // Process 180 phase shift, aka inverted bits buffer[i] ^= 0xFF; buffer[i+1] ^= 0xFF; } } } } uint32_t calculateError(uint8_t *original, uint8_t *corrected, int length) { uint32_t errors = 0; for (int i=0; i<length; i++) { errors += hardCorrelate(original[i], ~corrected[i]); } return errors; } void convEncode(uint8_t *data, int dataLength, uint8_t *output, int outputLen) { unsigned int encstate = 0; uint8_t c; uint32_t pos = 0; uint32_t opos = 0; memset(output, 0x00, outputLen); while (pos < dataLength && (pos * 16) < outputLen) { c = data[pos]; for(int i=7;i>=0;i--){ encstate = (encstate << 1) | ((c >> 7) & 1); c <<= 1; output[opos] = ~(0 - parity(encstate & viterbiPolynomial[0])); output[opos+1] = ~(0 - parity(encstate & viterbiPolynomial[1])); opos += 2; } pos++; } } void printBuff(uint8_t *buff, int length) { int countlen = (length > 40 ? 40 : length); for (int i=0; i<countlen; i++) { if (i % 8 == 0 && i != 0) { printf("\n"); } printf("%d ", buff[i]); } printf("\n"); } void deinterleaveRS(uint8_t *data, uint8_t *rsbuff, uint8_t pos, uint8_t I) { // Copy data for (int i=0; i<223; i++) { rsbuff[i] = data[i*I + pos]; } // Copy parity for (int i=0; i<32; i++) { rsbuff[i+223] = data[PARITY_OFFSET + i*I + pos]; } } void interleaveRS(uint8_t *idata, uint8_t *outbuff, uint8_t pos, uint8_t I) { // Copy data for (int i=0; i<223; i++) { outbuff[i*I + pos] = idata[i]; } // Copy parity - Not needed here, but I do. for (int i=0; i<32; i++) { outbuff[PARITY_OFFSET + i*I + pos] = idata[i+223]; } } void writeChannel(uint8_t *data, int size, uint16_t vcid) { char filename[256]; sprintf(filename, "channels/channel_%d.bin", vcid); FILE *f = fopen(filename, "a+"); fwrite(data, size, 1, f); fclose(f); } int main(int argc,char *argv[]) { if (argc < 3) { printf("Usage: ./decoder inputfile outputfile"); return 1; } char *inputfile = argv[1]; char *outputfile = argv[2]; void *viterbi; uint32_t averageVitCorrections = 0; uint32_t averageRSCorrections = 0; correlation_t corr; printf("Opening files\n"); FILE *input = fopen(inputfile, "r"); FILE *output = fopen(outputfile, "w"); initUW(); printf("Initializing Viterbi\n"); set_viterbi27_polynomial(viterbiPolynomial); if((viterbi = create_viterbi27(FRAMEBITS)) == NULL){ printf("create_viterbi27 failed\n"); exit(1); } fseek(input, 0L, SEEK_END); uint64_t sz = ftell(input); fseek(input, 0L, SEEK_SET); printf("Input size is %lu\n", sz); uint64_t readsize = 0; uint64_t frameCount = 1; while (readsize < sz) { // Read Data uint32_t chunkSize = sz - readsize > CODEDFRAMESIZE ? CODEDFRAMESIZE : sz - readsize; memset(codedData, 0x00, CODEDFRAMESIZE); fread(codedData, chunkSize, 1, input); //printBuff(codedData, chunkSize); // Check Correlation checkCorrelation(codedData, chunkSize, &corr); // Get Max Correlation uint32_t maxCorr = maxCorrelation(corr.uw0mc, corr.uw2mc, corr.ruw0mc, corr.ruw2mc); if (maxCorr < MINCORRELATIONBITS) { printf(" Skipping read. Correlation %d less than required %d.\n", maxCorr, MINCORRELATIONBITS); } else { // Check Phase Shifting and Position uint8_t n; uint32_t p; if (maxCorr == corr.uw0mc) { n = 0; p = corr.uw0p; } else if (maxCorr == corr.uw2mc) { n = 4; p = corr.uw2p; } else if (maxCorr == corr.ruw0mc) { n = 1; p = corr.ruw0p; } else if (maxCorr == corr.ruw2mc) { n = 5; p = corr.ruw2p; } if (p != 0) { // Shift position char *shiftedPosition = codedData + p; //printf(" Missing bytes for frame: %d\n", p); memcpy(codedData, shiftedPosition, CODEDFRAMESIZE - p); // Copy from p to chunk size to start of codedData readsize += chunkSize; // Add what we processed to readsize. uint32_t oldChunkSize = chunkSize; chunkSize = (sz - readsize) > p ? p : (sz - readsize); // Read needed bytes to fill a frame. //printf(" Reading for frame missing bytes: %d\n", chunkSize); fread(codedData + CODEDFRAMESIZE - p, chunkSize, 1, input); } // Correct Frame Phase //printf(" Fixing packet.\n"); fixPacket(codedData, CODEDFRAMESIZE, n); // Viterbi //printf(" Decoding using viterbi.\n"); init_viterbi27(viterbi, 0); update_viterbi27_blk(viterbi, codedData, FRAMEBITS + 6); chainback_viterbi27(viterbi, decodedData, FRAMEBITS, 0); #ifdef CHECK_VITERBI_CORRECTIONS //printf(" Re-encoding.\n"); // Calculate Errors convEncode(decodedData, FRAMESIZE, correctedData, CODEDFRAMESIZE); //printf(" Calculating errors.\n"); uint32_t errors = calculateError(codedData, correctedData, CODEDFRAMESIZE) / 2; float signalErrors = (100.f * errors) / FRAMEBITS; // 0 to 16 signalErrors = 100 - (signalErrors * 10); uint32_t signalQuality = signalErrors < 0 ? 0 : signalErrors; #endif // De-randomization //printf(" De-randomizing data.\n"); uint8_t skipsize = (SYNCWORDSIZE/8); memcpy(decodedData, decodedData + skipsize, FRAMESIZE-skipsize); for (int i=0; i<FRAMESIZE-skipsize; i++) { decodedData[i] ^= pn[i]; } // Reed-solomon int derrlocs[255]; int derrors[4] = { 0, 0, 0, 0 }; for (int i=0; i<RSBLOCKS; i++) { deinterleaveRS(decodedData, rsWorkBuffer, i, RSBLOCKS); derrors[i] = decode_rs_ccsds(rsWorkBuffer, derrlocs, 0, 0); interleaveRS(rsWorkBuffer, rsCorrectedData, i, RSBLOCKS); } // If RS returns -1 for all 4 RS Blocks, if (derrors[0] == -1 && derrors[1] == -1 && derrors[2] == -1 && derrors[3] == -1) { #ifdef CHECK_VITERBI_CORRECTIONS printf(" Viterbi Errors: %u/%u bits\n", errors, FRAMEBITS); printf(" Signal Quality: %u%%\n", signalQuality); printf(" Sync Correlation: %d\n", maxCorr); #endif printf(" Corrupted packet, RS Cannot correct. Dropping.\n"); goto packet_process_end; } else { averageRSCorrections += derrors[0] != -1 ? derrors[0] : 0; averageRSCorrections += derrors[1] != -1 ? derrors[1] : 0; averageRSCorrections += derrors[2] != -1 ? derrors[2] : 0; averageRSCorrections += derrors[3] != -1 ? derrors[3] : 0; } // Packet Header Filtering uint8_t versionNumber = (*rsCorrectedData) & 0xC0 >> 6; uint8_t scid = ((*rsCorrectedData) & 0x3F) << 2 | (*(rsCorrectedData+1) & 0xC0) >> 6; uint8_t vcid = (*(rsCorrectedData+1)) & 0x3F; // Packet Counter from Packet uint32_t counter = *((uint32_t *) (rsCorrectedData+2)); counter = swapEndianess(counter); counter &= 0xFFFFFF00; counter = counter >> 8; writeChannel(rsCorrectedData, FRAMESIZE - RSPARITYBLOCK - (SYNCWORDSIZE/8), vcid); if (vcid == 63) { //printf("Empty Frame. Discarding.\n"); //fwrite(rsCorrectedData, FRAMESIZE - skipsize, 1, fill); } else { //if (vcid == 42) { fwrite(rsCorrectedData, FRAMESIZE - skipsize, 1, output); printf("Frame %lu.\n", frameCount); printf(" Version Number: %u\n", versionNumber); printf(" S/C ID: %u\n", scid); printf(" VC ID: %u\n", vcid); printf(" Packet Number: %u\n", counter); #ifdef CHECK_VITERBI_CORRECTIONS printf(" Viterbi Errors: %u/%u bits\n", errors, FRAMEBITS); printf(" Signal Quality: %u%%\n", signalQuality); #endif printf(" RS Errors: %d %d %d %d\n", derrors[0], derrors[1], derrors[2], derrors[3]); printf(" Sync Correlation: %d\n", maxCorr); switch(n) { case 0: printf(" Max Correlation with 0 degrees Word at %u\n", p); break; case 4: printf(" Max Correlation with 180 degrees Word at %u\n", p); break; case 1: printf(" Max Correlation with 0 degrees Word at %u\n with IQ Reversal", p); break; case 5: printf(" Max Correlation with 180 degrees Word at %u\n with IQ Reversal", p); break; } } packet_process_end: averageVitCorrections += errors; frameCount++; } readsize += chunkSize; } averageVitCorrections /= frameCount; averageRSCorrections /= frameCount * 4; printf("Average Viterbi Correction: %u\n", averageVitCorrections); printf("Average ReedSolomon Correction: %u\n", averageRSCorrections); fclose(input); fclose(output); return 0; }

char pn[1020] = { 0xff, 0x48, 0x0e, 0xc0, 0x9a, 0x0d, 0x70, 0xbc, 0x8e, 0x2c, 0x93, 0xad, 0xa7, 0xb7, 0x46, 0xce, 0x5a, 0x97, 0x7d, 0xcc, 0x32, 0xa2, 0xbf, 0x3e, 0x0a, 0x10, 0xf1, 0x88, 0x94, 0xcd, 0xea, 0xb1, 0xfe, 0x90, 0x1d, 0x81, 0x34, 0x1a, 0xe1, 0x79, 0x1c, 0x59, 0x27, 0x5b, 0x4f, 0x6e, 0x8d, 0x9c, 0xb5, 0x2e, 0xfb, 0x98, 0x65, 0x45, 0x7e, 0x7c, 0x14, 0x21, 0xe3, 0x11, 0x29, 0x9b, 0xd5, 0x63, 0xfd, 0x20, 0x3b, 0x02, 0x68, 0x35, 0xc2, 0xf2, 0x38, 0xb2, 0x4e, 0xb6, 0x9e, 0xdd, 0x1b, 0x39, 0x6a, 0x5d, 0xf7, 0x30, 0xca, 0x8a, 0xfc, 0xf8, 0x28, 0x43, 0xc6, 0x22, 0x53, 0x37, 0xaa, 0xc7, 0xfa, 0x40, 0x76, 0x04, 0xd0, 0x6b, 0x85, 0xe4, 0x71, 0x64, 0x9d, 0x6d, 0x3d, 0xba, 0x36, 0x72, 0xd4, 0xbb, 0xee, 0x61, 0x95, 0x15, 0xf9, 0xf0, 0x50, 0x87, 0x8c, 0x44, 0xa6, 0x6f, 0x55, 0x8f, 0xf4, 0x80, 0xec, 0x09, 0xa0, 0xd7, 0x0b, 0xc8, 0xe2, 0xc9, 0x3a, 0xda, 0x7b, 0x74, 0x6c, 0xe5, 0xa9, 0x77, 0xdc, 0xc3, 0x2a, 0x2b, 0xf3, 0xe0, 0xa1, 0x0f, 0x18, 0x89, 0x4c, 0xde, 0xab, 0x1f, 0xe9, 0x01, 0xd8, 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