FreeCalypso > hg > gsm-net-reveng

annotate trau-decode/extr-main.c @ 58:a7ede064f883

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atrau-parse: check sync one bit
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 25 Sep 2024 17:50:41 +0000
parents 0565aaa84b17
children
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9
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1 /*
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2 * This program reads a 64 kbit/s timeslot recording file with a focus
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3 * on a single sub-timeslot just like trau-parse, but it needs to be
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4 * invoked with a starting and ending offset for the frame-aligned
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5 * portion of interest (found with trau-parse), and it saves (converts)
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6 * the selected stream of TRAU-UL frames to a Themyscira gsmx file.
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7 */
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8
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9 #include <sys/types.h>
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.h>
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15
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16 static void
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17 reduce_to_subslot(buf, right_shift)
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18 uint8_t *buf;
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19 {
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20 unsigned n;
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21
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22 for (n = 0; n < 160; n++) {
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23 buf[n] >>= right_shift;
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24 buf[n] &= 3;
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25 }
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26 }
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27
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28 static void
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29 unpack_dibits(dibits, frame_bits)
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30 uint8_t *dibits, *frame_bits;
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31 {
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32 int i, inb;
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33 uint8_t *op;
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34
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35 op = frame_bits;
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36 for (i = 0; i < 160; i++) {
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37 inb = dibits[i];
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38 if (inb & 2)
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39 *op++ = 1;
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40 else
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41 *op++ = 0;
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42 if (inb & 1)
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43 *op++ = 1;
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44 else
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45 *op++ = 0;
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46 }
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47 }
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48
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49 static unsigned
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50 bits_to_num(bits, nbits)
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51 uint8_t *bits;
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52 unsigned nbits;
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53 {
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54 unsigned accum;
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55 unsigned n;
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56
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57 accum = 0;
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58 for (n = 0; n < nbits; n++) {
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59 accum <<= 1;
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60 if (*bits)
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61 accum |= 1;
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62 bits++;
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63 }
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64 return accum;
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65 }
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66
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67 static void
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68 collect_d_bits(frame_bits, d_bits)
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69 uint8_t *frame_bits, *d_bits;
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70 {
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71 bcopy(frame_bits + 33, d_bits, 15);
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72 bcopy(frame_bits + 49, d_bits + 15, 15);
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73 bcopy(frame_bits + 65, d_bits + 30, 15);
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74 bcopy(frame_bits + 81, d_bits + 45, 15);
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75 bcopy(frame_bits + 97, d_bits + 60, 15);
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76 bcopy(frame_bits + 113, d_bits + 75, 15);
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77 bcopy(frame_bits + 129, d_bits + 90, 15);
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78 bcopy(frame_bits + 145, d_bits + 105, 15);
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79 bcopy(frame_bits + 161, d_bits + 120, 15);
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80 bcopy(frame_bits + 177, d_bits + 135, 15);
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81 bcopy(frame_bits + 193, d_bits + 150, 15);
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82 bcopy(frame_bits + 209, d_bits + 165, 15);
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83 bcopy(frame_bits + 225, d_bits + 180, 15);
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84 bcopy(frame_bits + 241, d_bits + 195, 15);
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85 bcopy(frame_bits + 257, d_bits + 210, 15);
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86 bcopy(frame_bits + 273, d_bits + 225, 15);
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87 bcopy(frame_bits + 289, d_bits + 240, 15);
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88 bcopy(frame_bits + 305, d_bits + 255, 5);
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89 }
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90
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91 static void
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92 process_frame(cur_offset, dibits, outf)
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93 u_long cur_offset;
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94 uint8_t *dibits;
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95 FILE *outf;
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96 {
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97 uint8_t frame_bits[320], d_bits[260];
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98 unsigned c1_5;
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99
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100 unpack_dibits(dibits, frame_bits);
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101 if (frame_bits[28]) { /* C12 aka BFI */
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102 putc(0xBF, outf);
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103 putc(frame_bits[31], outf); /* C15 aka TAF */
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104 return;
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105 }
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106 collect_d_bits(frame_bits, d_bits);
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107 c1_5 = bits_to_num(frame_bits + 17, 5);
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108 switch (c1_5) {
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109 case 0x02:
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110 convert_fr_frame(d_bits, outf);
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111 break;
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112 case 0x1A:
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113 convert_efr_frame(d_bits, outf);
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114 break;
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115 default:
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116 fprintf(stderr,
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117 "error: unknown frame type 0x%x at file offset 0x%lx\n",
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118 c1_5, cur_offset);
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119 exit(1);
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120 }
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121 }
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122
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123 main(argc, argv)
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124 char **argv;
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125 {
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126 FILE *inf, *outf;
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127 int subslot, right_shift;
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128 u_long start_offset, end_offset, cur_offset;
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129 uint8_t readbuf[160];
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130 int cc;
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131
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132 if (argc != 6) {
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133 fprintf(stderr, "usage: %s binfile subslot start end outfile\n",
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134 argv[0]);
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135 exit(1);
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136 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 inf = fopen(argv[1], "r");
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 if (!inf) {
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 perror(argv[1]);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 exit(1);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 }
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 subslot = atoi(argv[2]);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 if (subslot < 0 || subslot > 3) {
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 fprintf(stderr, "error: invalid subslot argument\n");
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 exit(1);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 }
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 right_shift = (3 - subslot) * 2;
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 start_offset = strtoul(argv[3], 0, 0);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 fseek(inf, start_offset, SEEK_SET);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 end_offset = strtoul(argv[4], 0, 0);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 outf = fopen(argv[5], "w");
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 if (!outf) {
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 perror(argv[5]);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 exit(1);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 }
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 for (cur_offset = start_offset; ; cur_offset += 160) {
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 if (end_offset && cur_offset >= end_offset)
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 break;
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 cc = fread(readbuf, 1, 160, inf);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 if (cc < 160)
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 break;
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 reduce_to_subslot(readbuf, right_shift);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 process_frame(cur_offset, readbuf, outf);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 }
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 exit(0);
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 }