FreeCalypso > hg > gsm-codec-lib

annotate frtest/dlcap-parse.c @ 207:10f11a2d4042

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pcap utils: fix bug in the case of RTP timestamp 16-bit rollover
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 17 Feb 2023 19:56:45 +0000
parents 5fe0b3eb35c1
children 251aed72925e
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1 /*
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2 * This program reads a TCH/FS downlink capture produced with FreeCalypso tools
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3 * (fw version with TCH downlink sniffing feature and fc-shell tch record),
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4 * parses the frame bits according to our current understanding, and dumps
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5 * everything in human-readable form for further analysis.
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6 */
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7
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8 #include <ctype.h>
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9 #include <stdio.h>
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10 #include <stdint.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include <gsm.h>
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15 #include "../libgsmfrp/gsm_fr_preproc.h"
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17 static void
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18 process_record(lineno, fn_mod_104, status_words, tidsp_bytes, dummy_state)
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19 int lineno;
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20 unsigned fn_mod_104;
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21 uint16_t *status_words;
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22 uint8_t *tidsp_bytes;
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23 gsm dummy_state;
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24 {
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25 uint8_t libgsm_bytes[33];
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26 int16_t params[76];
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27 int i, j, n;
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29 printf("#%d: fn=%u DSP %04X %04X %04X\n", lineno, fn_mod_104,
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30 status_words[0], status_words[1], status_words[2]);
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31 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
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32 fputs(" bits ", stdout);
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33 for (i = 0; i < 33; i++)
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34 printf("%02X", tidsp_bytes[i]);
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35 printf(" SID=%d\n", gsmfr_preproc_sid_classify(libgsm_bytes));
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36 gsm_explode(dummy_state, libgsm_bytes, params);
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37 fputs(" FR", stdout);
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38 n = 0;
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39 for (i = 0; i < 8; i++)
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40 printf(" %d", params[n++]);
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41 putchar('\n');
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42 for (i = 0; i < 4; i++) {
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43 putchar(' ');
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44 for (j = 0; j < 17; j++)
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45 printf(" %d", params[n++]);
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46 putchar('\n');
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47 }
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48 }
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50 main(argc, argv)
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51 char **argv;
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52 {
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53 FILE *inf;
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54 gsm dummy_state;
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55 char linebuf[128];
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56 int lineno, rc;
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57 uint16_t status_words[3];
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58 uint8_t tidsp_bytes[33];
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59 unsigned fn_mod_104;
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60
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61 if (argc != 2) {
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62 fprintf(stderr, "usage: %s dlcap-file\n", argv[0]);
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63 exit(1);
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64 }
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65 inf = fopen(argv[1], "r");
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66 if (!inf) {
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67 perror(argv[1]);
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68 exit(1);
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69 }
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70 dummy_state = gsm_create();
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71 if (!dummy_state) {
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72 fprintf(stderr, "gsm_create() failed!\n");
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73 exit(1);
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74 }
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75 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
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76 /* support both old and new formats */
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77 if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) &&
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78 isxdigit(linebuf[2]) && isxdigit(linebuf[3])) {
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79 /* also support parsing output from fc-vm2hex */
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80 if (linebuf[4] == '\n') {
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81 printf("#%d: fn=0 DSP %.4s\n", lineno, linebuf);
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82 continue;
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83 }
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84 rc = parse_dlcap_common(linebuf, status_words,
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85 tidsp_bytes);
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86 if (rc < 0) {
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87 invalid: fprintf(stderr,
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88 "error: %s is not in the expected format\n",
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89 argv[1]);
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90 exit(1);
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91 }
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92 fn_mod_104 = 0; /* won't have TAF */
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93 } else if (!strncmp(linebuf, "FR ", 3)) {
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94 rc = parse_dlcap_common(linebuf + 3, status_words,
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95 tidsp_bytes);
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96 if (rc < 0)
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97 goto invalid;
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98 if (linebuf[84] != ' ')
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99 goto invalid;
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100 if (!isdigit(linebuf[85]))
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101 goto invalid;
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102 fn_mod_104 = strtoul(linebuf + 85, 0, 10);
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103 } else
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104 goto invalid;
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105 process_record(lineno, fn_mod_104, status_words, tidsp_bytes,
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106 dummy_state);
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107 }
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108 exit(0);
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109 }