/*---------------------------------------------------------------------------*\ FILE........: fdmdv_interleave.c AUTHOR......: David Rowe DATE CREATED: May 27 2012 Given an input file of bits outputs an interleaved or optionally de-intervleaved file of bits. \*---------------------------------------------------------------------------*/ /* Copyright (C) 2012 David Rowe All rights reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 2, as published by the Free Software Foundation. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program; if not, see . */ #include #include #include #include #include #include #include "fdmdv.h" #define MAX_INTERLEAVER 1024 int main(int argc, char *argv[]) { FILE *fin, *fout, *finter; int interleaver[MAX_INTERLEAVER]; char *packed_bits; int *bits; int *interleaved_bits; int i, bit, byte, m, mpacked, frames, interleave, src_bit, dest_bit; if (argc < 4) { printf("usage: %s InputBitFile OutputBitFile InterleaverFile [de]\n", argv[0]); printf("e.g %s hts1a.c2 hts1a_interleaved.c2 interleaver.txt\n", argv[0]); exit(1); } if (strcmp(argv[1], "-") == 0) fin = stdin; else if ( (fin = fopen(argv[1],"rb")) == NULL ) { fprintf(stderr, "Error opening input bit file: %s: %s.\n", argv[1], strerror(errno)); exit(1); } if (strcmp(argv[2], "-") == 0) fout = stdout; else if ( (fout = fopen(argv[2],"wb")) == NULL ) { fprintf(stderr, "Error opening output bit file: %s: %s.\n", argv[2], strerror(errno)); exit(1); } if ((finter = fopen(argv[3],"rt")) == NULL ) { fprintf(stderr, "Error opening interleaver file: %s: %s.\n", argv[3], strerror(errno)); exit(1); } if (argc == 5) interleave = 1; else interleave = 0; /* load interleaver, size determines block size we will process */ src_bit = 0; while(fscanf(finter, "%d\n", &dest_bit) == 1) { if (interleave) interleaver[dest_bit] = src_bit; else interleaver[src_bit] = dest_bit; src_bit++; if (src_bit == MAX_INTERLEAVER) { fprintf(stderr, "Error interleaver too big\n"); exit(1); } } fclose(finter); m = src_bit; fprintf(stderr, "Interleaver size m = %d interleave = %d\n", m, interleave); mpacked = m/8; packed_bits = (char*)malloc(mpacked*sizeof(char)); assert(packed_bits != NULL); bits = (int*)malloc(m*sizeof(int)); assert(bits != NULL); interleaved_bits = (int*)malloc(m*sizeof(int)); assert(interleaved_bits != NULL); frames = 0; while(fread(packed_bits, sizeof(char), mpacked, fin) == mpacked) { frames++; /* unpack bits, MSB first */ bit = 7; byte = 0; for(i=0; i> bit) & 0x1; bit--; if (bit < 0) { bit = 7; byte++; } } assert(byte == mpacked); /* (de) interleave */ for(i=0; i