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tmo/CSD-tests: document Experiment 7
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 28 Nov 2024 02:53:59 +0000
parents 323a4b75a32d
children
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57
fe3cdbbc96f9 d144: new program atrau-parse
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This program reads a binary file containing a capture of 64 kbit/s output
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3 * of a TRAU in 14.4 kbit/s data mode. Per GSM specs this output is supposed
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4 * to contain A-TRAU frames of TS 48.020 chapter 11 (RAA' function);
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5 * this program looks for such frames and parses them.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <stdio.h>
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10 #include <stdint.h>
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11 #include <stdlib.h>
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12
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13 static void
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14 decode_ra2(ts_bytes, frame_bits)
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15 uint8_t *ts_bytes, *frame_bits;
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16 {
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17 uint8_t *ip, *op;
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18 unsigned n;
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19
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20 ip = ts_bytes;
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21 op = frame_bits;
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22 for (n = 0; n < 160; n++) {
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23 *op++ = (*ip & 0x80) >> 7;
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24 *op++ = (*ip & 0x40) >> 6;
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25 ip++;
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26 }
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27 }
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28
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29 static int
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30 check_sync_zeros(frame_bits)
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31 uint8_t *frame_bits;
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32 {
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33 int i;
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34
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35 for (i = 0; i < 16; i++) {
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36 if (frame_bits[i])
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37 return 0;
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38 }
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39 return 1;
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40 }
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41
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42 static unsigned
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43 gather_nibble(bits)
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44 uint8_t *bits;
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45 {
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46 unsigned n, acc;
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47
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48 acc = 0;
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49 for (n = 0; n < 4; n++) {
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50 acc <<= 1;
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51 acc |= *bits++;
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52 }
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53 return acc;
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54 }
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55
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56 static void
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57 dump_subframe(bits)
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58 uint8_t *bits;
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59 {
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60 unsigned n, d;
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61
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62 printf(" %u ", *bits++);
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63 for (n = 0; n < 9; n++) {
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64 d = gather_nibble(bits);
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65 printf("%x", d);
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66 bits += 4;
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67 }
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68 putchar('\n');
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69 }
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70
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71 static void
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72 dump_frame(frame_bits)
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73 uint8_t *frame_bits;
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74 {
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75 unsigned n;
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76
58
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77 if (!check_sync_zeros(frame_bits) || !frame_bits[16])
57
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78 printf(" Bad sync bits!\n");
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79 printf(" C1-C5: %u%u%u%u%u\n", frame_bits[17], frame_bits[18],
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80 frame_bits[19], frame_bits[20], frame_bits[21]);
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81 printf(" M1=%u M2=%u\n", frame_bits[22], frame_bits[23]);
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82 for (n = 0; n < 8; n++)
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83 dump_subframe(frame_bits + 24 + n * 37);
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84 }
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85
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86 main(argc, argv)
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87 char **argv;
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88 {
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89 FILE *binf;
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90 uint8_t frame_in[160], frame_bits[320];
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91 u_long file_offset;
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92 int cc;
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93
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94 if (argc != 2) {
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95 fprintf(stderr, "usage: %s capture.bin\n", argv[0]);
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96 exit(1);
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97 }
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98 binf = fopen(argv[1], "r");
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99 if (!binf) {
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100 perror(argv[1]);
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101 exit(1);
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102 }
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103 for (file_offset = 0; ; file_offset += 160) {
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104 cc = fread(frame_in, 1, 160, binf);
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105 if (cc <= 0)
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106 break;
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107 if (cc != 160) {
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108 fprintf(stderr,
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109 "error: %s is not a multiple of 160 bytes\n",
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110 argv[1]);
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111 exit(1);
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112 }
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113 printf("Frame at 0x%lx:\n", file_offset);
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114 decode_ra2(frame_in, frame_bits);
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115 dump_frame(frame_bits);
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116 putchar('\n');
57
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117 }
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118 exit(0);
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119 }