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annotate trau-decode/trau-hr-dump.c @ 72:afebef67e8d4 default tip

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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 61181373875d
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 #include "gsmhr_unpack.h"
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18 #include "osmo_bits.h"
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20 /*
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21 * EFR TRAU parity (also used for HR)
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22 *
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23 * g(x) = x^3 + x^1 + 1
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24 */
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25 static const struct osmo_crc8gen_code gsm0860_efr_crc3 = {
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26 .bits = 3,
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27 .poly = 0x3,
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28 .init = 0x0,
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29 .remainder = 0x7,
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30 };
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31
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32 static uint8_t *filebuf;
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33 static unsigned total_size;
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34
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35 static void
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36 read_ts_file(filename, subslot_arg)
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37 char *filename, *subslot_arg;
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38 {
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39 FILE *inf;
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40 struct stat st;
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41 int subslot, right_shift;
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42 unsigned n;
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43 uint8_t *dp;
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44 int b;
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45
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46 inf = fopen(filename, "r");
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47 if (!inf) {
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48 perror(filename);
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49 exit(1);
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50 }
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51 fstat(fileno(inf), &st);
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52 if (!S_ISREG(st.st_mode)) {
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53 fprintf(stderr, "error: %s is not a regular file\n", filename);
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54 exit(1);
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55 }
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56 total_size = st.st_size;
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57 if (total_size < 160) {
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58 fprintf(stderr, "error: %s is too short\n", filename);
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59 exit(1);
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60 }
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61 filebuf = malloc(total_size);
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62 if (!filebuf) {
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63 perror("malloc of file size");
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64 exit(1);
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65 }
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66 subslot = atoi(subslot_arg);
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67 if (subslot < 0 || subslot > 7) {
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68 fprintf(stderr, "error: invalid subslot argument\n");
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69 exit(1);
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70 }
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71 right_shift = 7 - subslot;
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72 dp = filebuf;
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73 for (n = 0; n < total_size; n++) {
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74 b = getc(inf);
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75 if (b < 0) {
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76 fprintf(stderr,
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77 "error: getc() returned EOF contrary to st_size\n");
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78 exit(1);
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79 }
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80 *dp++ = (b >> right_shift) & 1;
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81 }
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82 fclose(inf);
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83 }
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84
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85 static int
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86 check_sync(pos)
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87 unsigned pos;
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88 {
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89 uint8_t *cand = filebuf + pos;
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90 unsigned n;
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91
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92 for (n = 0; n < 8; n++) {
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93 if (cand[n])
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94 return 0;
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95 }
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96 if (!cand[8])
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97 return 0;
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98 if (cand[16])
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99 return 0;
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100 if (!cand[17])
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101 return 0;
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102 for (n = 3; n < 20; n++) {
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103 if (!cand[n * 8])
0
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104 return 0;
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105 }
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106 return 1;
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107 }
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108
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109 static int
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110 bit_parity(bits, nbits)
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111 ubit_t *bits;
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112 unsigned nbits;
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113 {
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114 unsigned n, sum;
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115
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116 sum = 0;
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117 for (n = 0; n < nbits; n++)
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118 sum += bits[n];
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119 return sum & 1;
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120 }
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121
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122 static void
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123 bits2bytes(bits, bytes, nbytes)
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124 ubit_t *bits;
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125 uint8_t *bytes;
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126 unsigned nbytes;
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127 {
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128 unsigned n, m, acc;
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129
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
130 for (n = 0; n < nbytes; n++) {
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
131 acc = 0;
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
132 for (m = 0; m < 8; m++) {
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
133 acc <<= 1;
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
134 acc |= *bits++;
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
135 }
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
136 *bytes++ = acc;
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
137 }
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
138 }
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
139
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 static void
27
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
141 process_frame(pos)
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
142 unsigned pos;
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 {
28
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
144 ubit_t *frame = filebuf + pos;
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
145 ubit_t xc_bits[6], dbits[112];
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
146 uint8_t hr_bytes[14];
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
147 int16_t params[18];
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
148 int crc_stat;
27
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
149
28
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
150 printf("Frame at 0x%x:\n", pos);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
151 printf(" C1-C4: %u%u%u%u OP %s\n", frame[9], frame[10], frame[11],
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
152 frame[12], bit_parity(frame + 9, 5) ? "good" : "bad");
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
153 bcopy(frame + 14, xc_bits, 2);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
154 bcopy(frame + 18, xc_bits + 2, 4);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
155 printf(" XC1-XC5: %u%u%u%u%u OP %s\n", xc_bits[0], xc_bits[1],
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
156 xc_bits[2], xc_bits[3], xc_bits[4],
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
157 bit_parity(xc_bits, 6) ? "good" : "bad");
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
158 bcopy(frame + 22, dbits, 2);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
159 bcopy(frame + 25, dbits + 2, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
160 bcopy(frame + 33, dbits + 9, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
161 bcopy(frame + 41, dbits + 16, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
162 bcopy(frame + 49, dbits + 23, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
163 bcopy(frame + 57, dbits + 30, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
164 bcopy(frame + 65, dbits + 37, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
165 bcopy(frame + 76, dbits + 44, 4);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
166 bcopy(frame + 81, dbits + 48, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
167 bcopy(frame + 89, dbits + 55, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
168 bcopy(frame + 97, dbits + 62, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
169 bcopy(frame + 105, dbits + 69, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
170 bcopy(frame + 113, dbits + 76, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
171 bcopy(frame + 121, dbits + 83, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
172 bcopy(frame + 129, dbits + 90, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
173 bcopy(frame + 137, dbits + 97, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
174 bcopy(frame + 145, dbits + 104, 7);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
175 dbits[111] = frame[153];
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
176 crc_stat = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, dbits, 44,
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
177 frame + 73);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
178 printf(" CRC %s\n", crc_stat ? "bad" : "good");
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
179 bits2bytes(dbits, hr_bytes, 14);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
180 gsmhr_unpack_ts101318(hr_bytes, params);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
181 printf(" R0=%02x LPC=%03x,%03x,%02x Int=%x Mode=%x\n", params[0],
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
182 params[1], params[2], params[3], params[4], params[5]);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
183 printf(params[5] ? " s1=%02x,%03x,%02x" : " s1=%02x,%02x,%02x",
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
184 params[6], params[7], params[8]);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
185 printf(params[5] ? " s2=%x,%03x,%02x" : " s2=%02x,%02x,%02x",
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
186 params[9], params[10], params[11]);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
187 printf(params[5] ? " s3=%x,%03x,%02x" : " s3=%02x,%02x,%02x",
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
188 params[12], params[13], params[14]);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
189 printf(params[5] ? " s4=%x,%03x,%02x\n" : " s4=%02x,%02x,%02x\n",
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
190 params[15], params[16], params[17]);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
191 printf(" C6-C9: %u%u%u%u\n", frame[154], frame[155], frame[156],
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
192 frame[157]);
9bcdb091c24d trau-decode: new program trau-hr-dump
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
193 printf(" T1=%u T2=%u\n", frame[158], frame[159]);
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 static void
27
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
197 process_filebuf()
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 {
27
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
199 unsigned p, endp;
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
200 int sync = 0, match;
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
201
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
202 endp = total_size - 160;
42
61181373875d trau-hr-dump: off-by-one error in file end limit
Mychaela Falconia <falcon@freecalypso.org>
parents: 28
diff changeset
203 for (p = 0; p <= endp; ) {
27
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
204 match = check_sync(p);
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
205 if (match != sync) {
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
206 printf("# %s frame sync at file offset 0x%x\n",
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
207 match ? "Acquired" : "Lost", p);
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 }
27
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
209 if (match) {
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
210 process_frame(p);
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
211 if (!filebuf[p+158] && !filebuf[p+159]) {
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
212 printf(
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
213 "# both T bits equal 0, shifting frame alignment\n");
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
214 p += 158;
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
215 } else
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
216 p += 160;
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
217 } else
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
218 p++;
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
219 sync = match;
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 }
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 main(argc, argv)
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 char **argv;
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 if (argc != 3) {
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 fprintf(stderr, "usage: %s binfile subslot\n", argv[0]);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 exit(1);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 }
27
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
230 read_ts_file(argv[1], argv[2]);
f508dacf2cf9 trau-decode: new programs dump-1bit and trau-sync8
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
231 process_filebuf();
0
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 exit(0);
131e0f1972bb beginning of trau-parse program
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 }