FreeCalypso > hg > gsm-net-reveng

annotate trau-decode/trau-hr-dump.c @ 96:13d47c9df28b

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trau-hr-dump: add -s option for subset sync pattern match With this option, trau-hr-dump can be used to decode TFO-HRv1 captures that contain embedded TFO messages.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 18 Mar 2025 23:55:29 +0000
parents 7c7ace4999c1
children
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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, decodes each frame as HRv1 speech and dumps everything it
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5 * decodes.
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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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20 static int include_raw, sync_subset;
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22 static void
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23 read_ts_file(filename, subslot_arg)
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24 char *filename, *subslot_arg;
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25 {
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26 FILE *inf;
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27 struct stat st;
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28 int subslot, right_shift;
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29 unsigned n;
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30 uint8_t *dp;
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31 int b;
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32
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33 inf = fopen(filename, "r");
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34 if (!inf) {
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35 perror(filename);
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36 exit(1);
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37 }
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38 fstat(fileno(inf), &st);
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39 if (!S_ISREG(st.st_mode)) {
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40 fprintf(stderr, "error: %s is not a regular file\n", filename);
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41 exit(1);
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42 }
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43 total_size = st.st_size;
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44 if (total_size < 160) {
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45 fprintf(stderr, "error: %s is too short\n", filename);
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46 exit(1);
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47 }
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48 filebuf = malloc(total_size);
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49 if (!filebuf) {
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50 perror("malloc of file size");
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51 exit(1);
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52 }
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53 subslot = atoi(subslot_arg);
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54 if (subslot < 0 || subslot > 7) {
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55 fprintf(stderr, "error: invalid subslot argument\n");
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56 exit(1);
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57 }
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58 right_shift = 7 - subslot;
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59 dp = filebuf;
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60 for (n = 0; n < total_size; n++) {
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61 b = getc(inf);
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62 if (b < 0) {
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63 fprintf(stderr,
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64 "error: getc() returned EOF contrary to st_size\n");
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65 exit(1);
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66 }
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67 *dp++ = (b >> right_shift) & 1;
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68 }
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69 fclose(inf);
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70 }
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71
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72 static int
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73 check_sync(pos)
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74 unsigned pos;
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75 {
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76 uint8_t *cand = filebuf + pos;
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77 unsigned n;
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78
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79 for (n = 0; n < 8; n++) {
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80 if (cand[n])
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81 return 0;
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82 }
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83 if (!cand[8])
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84 return 0;
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85 if (cand[16] && !sync_subset)
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86 return 0;
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87 if (!cand[17])
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88 return 0;
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89 for (n = 3; n < 20; n++) {
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90 if (sync_subset && (n & 1) == 0)
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91 continue;
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92 if (!cand[n * 8])
0
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93 return 0;
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94 }
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95 return 1;
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96 }
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97
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98 static void
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99 dump_raw_frame(frame_bits)
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100 uint8_t *frame_bits;
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101 {
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102 uint8_t *sp = frame_bits;
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103 unsigned n, m, d;
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104
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105 for (n = 0; n < 40; n++) {
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106 d = 0;
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107 for (m = 0; m < 4; m++) {
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108 d <<= 1;
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109 d |= *sp++;
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110 }
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111 printf("%x", d);
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112 }
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113 putchar('\n');
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114 }
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115
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116 static void
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117 process_frame(pos)
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118 unsigned pos;
0
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119 {
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120 uint8_t *frame = filebuf + pos;
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121
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122 printf("Frame at 0x%x:\n", pos);
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123 if (include_raw)
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124 dump_raw_frame(frame);
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125 print_gsmhr_frame(frame);
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126 }
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127
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128 static void
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f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
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129 process_filebuf()
0
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130 {
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f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
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131 unsigned p, endp;
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132 int sync = 0, match;
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133
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134 endp = total_size - 160;
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61181373875d trau-hr-dump: off-by-one error in file end limit
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135 for (p = 0; p <= endp; ) {
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f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
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136 match = check_sync(p);
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137 if (match != sync) {
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138 printf("# %s frame sync at file offset 0x%x\n",
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139 match ? "Acquired" : "Lost", p);
0
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140 }
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f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
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141 if (match) {
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142 process_frame(p);
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143 if (!filebuf[p+158] && !filebuf[p+159]) {
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144 printf(
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145 "# both T bits equal 0, shifting frame alignment\n");
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146 p += 158;
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147 } else
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148 p += 160;
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149 } else
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150 p++;
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151 sync = match;
0
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152 }
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153 }
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154
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155 main(argc, argv)
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156 char **argv;
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157 {
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158 extern int optind;
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159 int c;
73
06f241846c67 trau-hr-dump: add -r option for raw frame output
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160
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161 while ((c = getopt(argc, argv, "rs")) != EOF) {
95
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162 switch (c) {
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163 case 'r':
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164 include_raw = 1;
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165 continue;
96
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166 case 's':
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167 sync_subset = 1;
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168 continue;
95
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169 default:
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170 usage:
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171 fprintf(stderr, "usage: %s [-r] [-s] binfile subslot\n",
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172 argv[0]);
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173 exit(1);
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174 }
0
131e0f1972bb beginning of trau-parse program
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175 }
95
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diff changeset
176 if (argc != optind + 2)
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177 goto usage;
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178 read_ts_file(argv[optind], argv[optind + 1]);
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f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
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diff changeset
179 process_filebuf();
0
131e0f1972bb beginning of trau-parse program
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180 exit(0);
131e0f1972bb beginning of trau-parse program
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181 }