FreeCalypso > hg > gsm-codec-lib

annotate frtest/cvt-dlcap.c @ 137:b7ea278390eb

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gsmfr-cvt-dlcap: support new FC TCH DL recording format
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 13 Dec 2022 04:37:45 +0000
parents 7960744ba19c
children be57e06bed84
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
19
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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1 /*
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2 * This program reads a TCH 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 * and converts it into our extended-libgsm binary format, to be further
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5 * fed to gsmfr-decode.
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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6 */
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7
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8 #include <sys/types.h>
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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9 #include <ctype.h>
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10 #include <stdio.h>
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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11 #include <stdlib.h>
137
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12 #include <string.h>
b7ea278390eb gsmfr-cvt-dlcap: support new FC TCH DL recording format
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13 #include <strings.h>
19
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14
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15 static
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16 decode_hex_digit(ch)
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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17 {
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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18 if (isdigit(ch))
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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19 return(ch - '0');
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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20 else if (isupper(ch))
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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21 return(ch - 'A' + 10);
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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22 else
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23 return(ch - 'a' + 10);
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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24 }
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25
137
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26 static
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27 parse_classic_part(line, status_words, tidsp_bytes)
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28 char *line;
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29 u_short *status_words;
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30 u_char *tidsp_bytes;
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31 {
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32 char *cp;
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33 int i;
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34
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35 /* grok DSP status words */
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36 cp = line;
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37 for (i = 0; i < 3; i++) {
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38 if (!isxdigit(cp[0]) || !isxdigit(cp[1]) ||
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39 !isxdigit(cp[2]) || !isxdigit(cp[3]))
b7ea278390eb gsmfr-cvt-dlcap: support new FC TCH DL recording format
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40 return -1;
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41 status_words[i] = (decode_hex_digit(cp[0]) << 12) |
b7ea278390eb gsmfr-cvt-dlcap: support new FC TCH DL recording format
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42 (decode_hex_digit(cp[1]) << 8) |
b7ea278390eb gsmfr-cvt-dlcap: support new FC TCH DL recording format
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43 (decode_hex_digit(cp[2]) << 4) |
b7ea278390eb gsmfr-cvt-dlcap: support new FC TCH DL recording format
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44 decode_hex_digit(cp[3]);
b7ea278390eb gsmfr-cvt-dlcap: support new FC TCH DL recording format
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45 cp += 4;
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46 if (*cp++ != ' ')
b7ea278390eb gsmfr-cvt-dlcap: support new FC TCH DL recording format
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47 return -1;
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48 }
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49 /* read the frame bits */
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50 for (i = 0; i < 33; i++) {
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51 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
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52 return -1;
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53 tidsp_bytes[i] = (decode_hex_digit(cp[0]) << 4) |
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54 decode_hex_digit(cp[1]);
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55 cp += 2;
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56 }
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57 return 0;
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58 }
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59
19
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60 main(argc, argv)
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61 char **argv;
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62 {
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63 FILE *inf, *outf;
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64 char linebuf[128];
137
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65 int lineno, rc;
19
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66 u_short status_words[3];
137
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67 u_char tidsp_bytes[33], libgsm_bytes[33], bfi[2];
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68 unsigned fn_mod_104;
19
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69
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70 if (argc != 3) {
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71 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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72 exit(1);
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73 }
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74 inf = fopen(argv[1], "r");
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75 if (!inf) {
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76 perror(argv[1]);
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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77 exit(1);
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78 }
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79 outf = fopen(argv[2], "w");
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80 if (!outf) {
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81 perror(argv[2]);
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82 exit(1);
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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83 }
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84 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
137
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85 /* support both old and new formats */
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86 if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) &&
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87 isxdigit(linebuf[2]) && isxdigit(linebuf[3])) {
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88 rc = parse_classic_part(linebuf, status_words,
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89 tidsp_bytes);
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90 if (rc < 0) {
19
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91 invalid: fprintf(stderr,
137
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92 "error: %s is not in the expected format\n",
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93 argv[1]);
19
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94 exit(1);
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95 }
137
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96 fn_mod_104 = 0; /* won't have TAF */
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97 } else if (!strncmp(linebuf, "FR ", 3)) {
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98 rc = parse_classic_part(linebuf + 3, status_words,
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99 tidsp_bytes);
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100 if (rc < 0)
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101 goto invalid;
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102 if (linebuf[84] != ' ')
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103 goto invalid;
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104 if (!isdigit(linebuf[85]))
19
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105 goto invalid;
137
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106 fn_mod_104 = strtoul(linebuf + 85, 0, 10);
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107 } else
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108 goto invalid;
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109 /*
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110 * Bit 15 of status word 0 is buffer validity flag,
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111 * bit 2 is BFI.
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112 */
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113 if (!(status_words[0] & 0x8000) || (status_words[0] & 0x0004)) {
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114 bfi[0] = 0xBF;
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115 bfi[1] = fn_mod_104 == 60;
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116 fwrite(bfi, 1, 2, outf);
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117 } else {
19
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diff changeset
118 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 fwrite(libgsm_bytes, 1, 33, outf);
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 }
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 }
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 exit(0);
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 }