FreeCalypso > hg > gsm-net-reveng
annotate trau-decode/trau-sync8.c @ 27:f508dacf2cf9
trau-decode: new programs dump-1bit and trau-sync8
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 18 Aug 2024 06:26:23 +0000 |
parents | trau-decode/parse-main.c@4d1732e4a143 |
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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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20 |
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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]) |
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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]) |
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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; |
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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'); |
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111 } |
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112 |
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113 static void |
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114 process_filebuf() |
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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); |
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125 } |
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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( |
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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; |
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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 } |
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147 read_ts_file(argv[1], argv[2]); |
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148 process_filebuf(); |
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149 exit(0); |
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150 } |