FreeCalypso > hg > vband-misc

annotate hr-sid/sidgen.c @ 45:5c82f2e56d56

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hr-sid: hack created
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 09 Jun 2024 08:57:28 +0000
parents
children
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45
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * This program generates a sequence of GSM-HR codec frames in raw packed
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Mychaela Falconia <falcon@freecalypso.org>
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3 * format (aka TS 101 318) that aims to reverse-engineer the logic of
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Mychaela Falconia <falcon@freecalypso.org>
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4 * the SID detector in TI Calypso DSP, and maybe later in historical
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5 * E1 BTS implementations too.
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6 */
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7
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8 #include <stdio.h>
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9 #include <stdint.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13
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14 static const uint8_t perfect_sid[14] = {
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15 0x11, 0x22, 0x33, 0x44, 0xFF, 0xFF, 0xFF,
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16 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
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17 };
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18
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19 static void
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20 clear_bit(buf, num)
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21 uint8_t *buf;
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22 unsigned num;
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23 {
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24 unsigned nbyte = num / 8;
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25 unsigned nbit = num % 8;
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26 unsigned mask = 0x80 >> nbit;
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27
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28 buf[nbyte] &= ~mask;
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29 }
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30
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31 static void
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32 corrupt_class1_bit(buf, num)
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33 uint8_t *buf;
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34 unsigned num;
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35 {
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36 clear_bit(buf, num + 36);
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37 }
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38
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39 static void
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40 corrupt_class2_bit(buf, num)
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41 uint8_t *buf;
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42 unsigned num;
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43 {
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44 if (num < 8)
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45 clear_bit(buf, num + 81);
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46 else
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47 clear_bit(buf, (num - 8) + 98);
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48 }
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49
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50 main(argc, argv)
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51 char **argv;
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52 {
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53 FILE *outf;
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54 uint8_t class1[14], class2[14];
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55 unsigned n1, n2;
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56
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57 if (argc != 2) {
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58 fprintf(stderr, "usage: %s outfile\n", argv[0]);
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59 exit(1);
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60 }
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61 outf = fopen(argv[1], "w");
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62 if (!outf) {
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63 perror(argv[1]);
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64 exit(1);
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65 }
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Mychaela Falconia <falcon@freecalypso.org>
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66 bcopy(perfect_sid, class1, 14);
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67 for (n1 = 0; n1 < 20; n1++) {
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68 bcopy(class1, class2, 14);
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69 for (n2 = 0; n2 < 17; n2++) {
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70 fwrite(class2, 1, 14, outf);
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71 corrupt_class2_bit(class2, n2);
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72 }
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73 fwrite(class2, 1, 14, outf);
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74 corrupt_class1_bit(class1, n1);
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75 }
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Mychaela Falconia <falcon@freecalypso.org>
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76 fclose(outf);
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77 exit(0);
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78 }