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annotate v110/v110-dump16.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 796cc2d94204
children
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1 /*
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2 * This program reads a 64 kbit/s timeslot recording file, examines it
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3 * as V.110 with 16 kbit/s intermediate rate, locates 80-bit V.110 frames
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4 * and dumps them in a mostly raw form.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/file.h>
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9 #include <sys/stat.h>
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10 #include <sys/mman.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 const 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)
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23 char *filename;
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24 {
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25 int fd;
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26 struct stat st;
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28 fd = open(filename, O_RDONLY);
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29 if (fd < 0) {
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30 perror(filename);
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31 exit(1);
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32 }
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33 fstat(fd, &st);
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34 if (!S_ISREG(st.st_mode)) {
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35 fprintf(stderr, "error: %s is not a regular file\n", filename);
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36 exit(1);
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37 }
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38 total_size = st.st_size;
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39 if (total_size < 40) {
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40 fprintf(stderr, "error: %s is too short\n", filename);
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41 exit(1);
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42 }
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43 filebuf = mmap(NULL, total_size, PROT_READ, MAP_PRIVATE, fd, 0);
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44 if (filebuf == MAP_FAILED) {
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45 perror("mmap");
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46 exit(1);
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47 }
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48 close(fd);
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49 }
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50
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51 static int
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52 check_sync(pos)
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53 unsigned pos;
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54 {
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55 const uint8_t *cand = filebuf + pos;
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56 unsigned n;
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57
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58 for (n = 0; n < 4; n++) {
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59 if (cand[n] & 0xC0)
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60 return 0;
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61 }
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62 for (n = 1; n < 10; n++) {
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63 if (!(cand[n * 4] & 0x80))
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64 return 0;
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65 }
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66 return 1;
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67 }
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68
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69 static unsigned
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70 extract_data_byte(pos)
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71 unsigned pos;
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72 {
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73 const uint8_t *src = filebuf + pos;
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74 unsigned accum;
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75 unsigned n;
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76
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77 accum = 0;
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78 for (n = 0; n < 4; n++) {
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79 accum <<= 1;
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80 if (*src & 0x80)
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81 accum |= 1;
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82 accum <<= 1;
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83 if (*src & 0x40)
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84 accum |= 1;
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85 src++;
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86 }
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87 return accum;
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88 }
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89
0
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90 static void
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91 process_frame(pos)
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92 unsigned pos;
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93 {
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94 unsigned nb;
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95
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96 printf("Frame at 0x%x:", pos);
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97 pos += 4;
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98 for (nb = 0; nb < 9; nb++) {
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99 printf(" %02X", extract_data_byte(pos));
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100 pos += 4;
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101 }
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102 putchar('\n');
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103 }
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104
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105 static void
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106 process_filebuf()
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107 {
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108 unsigned p, endp;
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109 int sync = 0, match;
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110
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111 endp = total_size - 40;
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112 for (p = 0; p <= endp; ) {
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113 match = check_sync(p);
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114 if (match != sync) {
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115 printf("# %s frame sync at file offset 0x%x\n",
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116 match ? "Acquired" : "Lost", p);
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117 }
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118 if (match) {
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119 process_frame(p);
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120 p += 40;
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121 } else
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122 p++;
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123 sync = match;
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124 }
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125 }
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126
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127 main(argc, argv)
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128 char **argv;
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129 {
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130 if (argc != 2) {
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131 fprintf(stderr, "usage: %s binfile\n", argv[0]);
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132 exit(1);
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133 }
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134 read_ts_file(argv[1]);
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135 process_filebuf();
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136 exit(0);
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137 }