FreeCalypso > hg > gsm-net-reveng

annotate trau-decode/trau-sync8.c @ 35:0979407719f0

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doc/TFO-xform/HRv1: article written
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 02 Sep 2024 07:32:09 +0000
parents f508dacf2cf9
children b15dfdc62ceb
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1 /*
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2 * This program reads a 64 kbit/s timeslot recording file, examines one
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3 * of the eight 8 kbit/s subslots (selected), looks for the sync pattern of
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4 * GSM 08.61 (HRv1 speech or HR data), and dumps each synced frame
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5 * as a hex line.
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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 <sys/file.h>
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10 #include <sys/stat.h>
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11 #include <stdio.h>
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12 #include <stdint.h>
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13 #include <stdlib.h>
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14 #include <string.h>
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15 #include <strings.h>
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16 #include <unistd.h>
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17
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18 static uint8_t *filebuf;
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19 static unsigned total_size;
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21 static void
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22 read_ts_file(filename, subslot_arg)
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23 char *filename, *subslot_arg;
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24 {
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25 FILE *inf;
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26 struct stat st;
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27 int subslot, right_shift;
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28 unsigned n;
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29 uint8_t *dp;
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30 int b;
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31
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32 inf = fopen(filename, "r");
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33 if (!inf) {
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34 perror(filename);
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35 exit(1);
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36 }
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37 fstat(fileno(inf), &st);
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38 if (!S_ISREG(st.st_mode)) {
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39 fprintf(stderr, "error: %s is not a regular file\n", filename);
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40 exit(1);
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41 }
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42 total_size = st.st_size;
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43 if (total_size < 160) {
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44 fprintf(stderr, "error: %s is too short\n", filename);
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45 exit(1);
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46 }
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47 filebuf = malloc(total_size);
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48 if (!filebuf) {
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49 perror("malloc of file size");
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50 exit(1);
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51 }
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52 subslot = atoi(subslot_arg);
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53 if (subslot < 0 || subslot > 7) {
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54 fprintf(stderr, "error: invalid subslot argument\n");
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55 exit(1);
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56 }
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57 right_shift = 7 - subslot;
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58 dp = filebuf;
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59 for (n = 0; n < total_size; n++) {
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60 b = getc(inf);
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61 if (b < 0) {
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62 fprintf(stderr,
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63 "error: getc() returned EOF contrary to st_size\n");
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64 exit(1);
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65 }
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66 *dp++ = (b >> right_shift) & 1;
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67 }
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68 fclose(inf);
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69 }
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70
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71 static int
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72 check_sync(pos)
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73 unsigned pos;
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74 {
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75 uint8_t *cand = filebuf + pos;
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76 unsigned n;
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77
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78 for (n = 0; n < 8; n++) {
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79 if (cand[n])
0
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80 return 0;
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81 }
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82 if (!cand[8])
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83 return 0;
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84 if (cand[16])
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85 return 0;
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86 if (!cand[17])
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87 return 0;
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88 for (n = 3; n < 20; n++) {
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89 if (!cand[n * 8])
0
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90 return 0;
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91 }
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92 return 1;
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93 }
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94
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95 static void
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96 process_frame(pos)
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97 unsigned pos;
0
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98 {
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99 uint8_t *sp = filebuf + pos;
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100 unsigned n, m, d;
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101
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102 for (n = 0; n < 40; n++) {
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103 d = 0;
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104 for (m = 0; m < 4; m++) {
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105 d <<= 1;
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106 d |= *sp++;
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107 }
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108 printf("%x", d);
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109 }
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110 putchar('\n');
0
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111 }
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112
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113 static void
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114 process_filebuf()
0
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115 {
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116 unsigned p, endp;
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117 int sync = 0, match;
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118
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119 endp = total_size - 160;
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120 for (p = 0; p < endp; ) {
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121 match = check_sync(p);
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122 if (match != sync) {
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123 printf("# %s frame sync at file offset 0x%x\n",
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124 match ? "Acquired" : "Lost", p);
0
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125 }
27
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126 if (match) {
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127 process_frame(p);
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128 if (!filebuf[p+158] && !filebuf[p+159]) {
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129 printf(
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
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130 "# both T bits equal 0, shifting frame alignment\n");
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131 p += 158;
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132 } else
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133 p += 160;
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134 } else
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135 p++;
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136 sync = match;
0
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137 }
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138 }
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139
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140 main(argc, argv)
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141 char **argv;
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142 {
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143 if (argc != 3) {
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144 fprintf(stderr, "usage: %s binfile subslot\n", argv[0]);
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145 exit(1);
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146 }
27
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147 read_ts_file(argv[1], argv[2]);
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148 process_filebuf();
0
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149 exit(0);
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150 }