FreeCalypso > hg > gsm-codec-lib
annotate frtest/cvt-dlcap.c @ 137:b7ea278390eb
gsmfr-cvt-dlcap: support new FC TCH DL recording format
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 13 Dec 2022 04:37:45 +0000 |
parents | 7960744ba19c |
children | be57e06bed84 |
rev | line source |
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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. |
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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 <ctype.h> |
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10 #include <stdio.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 |
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15 static |
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16 decode_hex_digit(ch) |
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17 { |
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18 if (isdigit(ch)) |
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19 return(ch - '0'); |
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20 else if (isupper(ch)) |
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21 return(ch - 'A' + 10); |
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22 else |
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23 return(ch - 'a' + 10); |
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24 } |
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25 |
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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])) |
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40 return -1; |
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41 status_words[i] = (decode_hex_digit(cp[0]) << 12) | |
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42 (decode_hex_digit(cp[1]) << 8) | |
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43 (decode_hex_digit(cp[2]) << 4) | |
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44 decode_hex_digit(cp[3]); |
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45 cp += 4; |
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46 if (*cp++ != ' ') |
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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 |
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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]; |
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65 int lineno, rc; |
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66 u_short status_words[3]; |
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67 u_char tidsp_bytes[33], libgsm_bytes[33], bfi[2]; |
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68 unsigned fn_mod_104; |
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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]); |
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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); |
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83 } |
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84 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) { |
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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) { |
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91 invalid: fprintf(stderr, |
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92 "error: %s is not in the expected format\n", |
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93 argv[1]); |
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94 exit(1); |
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95 } |
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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])) |
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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 { |
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118 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes); |
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119 fwrite(libgsm_bytes, 1, 33, outf); |
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120 } |
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121 } |
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122 exit(0); |
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123 } |