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annotate trau-decode/dump-1bit.c @ 71:ed314cc25b8d default tip

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tmo/CSD-tests: additional experiments and historical notes
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 26 Nov 2024 20:56:33 +0000
parents f508dacf2cf9
children
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f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
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1 /*
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2 * This program reads a 64 kbit/s timeslot recording file, focuses on one
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3 * bit out of the eight (a single 8 kbit/s subslot) and prints a dump
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4 * that shows just this one bit out of each byte. It is an aid for
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
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5 * development and debugging of frame sync tools for 8 kbit/s submultiplexing.
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6 */
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7
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10
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11 main(argc, argv)
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12 char **argv;
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13 {
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14 FILE *inf;
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15 int subslot, right_shift;
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16 unsigned file_offset, mod16;
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17 int inb;
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18
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19 if (argc != 3) {
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20 fprintf(stderr, "usage: %s binfile subslot\n", argv[0]);
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21 exit(1);
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22 }
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23 inf = fopen(argv[1], "r");
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24 if (!inf) {
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25 perror(argv[1]);
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26 exit(1);
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27 }
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28 subslot = atoi(argv[2]);
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29 if (subslot < 0 || subslot > 7) {
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30 fprintf(stderr, "error: invalid subslot argument\n");
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31 exit(1);
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32 }
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33 right_shift = 7 - subslot;
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34 for (file_offset = 0; ; file_offset++) {
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35 inb = getc(inf);
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36 if (inb < 0)
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37 break;
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38 mod16 = file_offset & 15;
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39 if (mod16 == 0)
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40 printf("%08X:", file_offset);
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41 if (mod16 == 0 || mod16 == 4 || mod16 == 8 || mod16 == 12)
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42 putchar(' ');
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43 printf(" %u", (inb >> right_shift) & 1);
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44 if (mod16 == 15)
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45 putchar('\n');
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46 }
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47 }