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annotate frtest/cvt-dlcap.c @ 46:edd2e20e7090

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gsmrec-dump: decode EFR frames
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 25 Nov 2022 03:06:03 +0000
parents 7960744ba19c
children b7ea278390eb
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19
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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2 * This program reads a TCH downlink capture produced with FreeCalypso tools
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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3 * (fw version with TCH downlink sniffing feature and fc-shell tch record)
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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4 * and converts it into our extended-libgsm binary format, to be further
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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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>
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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
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13 static const char bfi_marker[2] = {0xBF, 0x00};
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14
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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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 main(argc, argv)
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27 char **argv;
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28 {
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29 FILE *inf, *outf;
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30 char linebuf[128];
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31 int lineno;
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32 char *cp;
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33 int i;
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34 u_short status_words[3];
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35 u_char tidsp_bytes[33], libgsm_bytes[33];
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36
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37 if (argc != 3) {
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38 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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39 exit(1);
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40 }
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41 inf = fopen(argv[1], "r");
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42 if (!inf) {
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43 perror(argv[1]);
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44 exit(1);
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45 }
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46 outf = fopen(argv[2], "w");
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47 if (!outf) {
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48 perror(argv[2]);
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49 exit(1);
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50 }
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51 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
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52 /* grok DSP status words */
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53 cp = linebuf;
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54 for (i = 0; i < 3; i++) {
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55 if (!isxdigit(cp[0]) || !isxdigit(cp[1]) ||
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56 !isxdigit(cp[2]) || !isxdigit(cp[3])) {
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57 invalid: fprintf(stderr,
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58 "error: %s is not in the expected format\n",
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59 argv[1]);
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60 exit(1);
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61 }
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62 status_words[i] = (decode_hex_digit(cp[0]) << 12) |
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63 (decode_hex_digit(cp[1]) << 8) |
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64 (decode_hex_digit(cp[2]) << 4) |
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65 decode_hex_digit(cp[3]);
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66 cp += 4;
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67 if (*cp++ != ' ')
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68 goto invalid;
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69 }
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70 /* read the frame bits */
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71 for (i = 0; i < 33; i++) {
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72 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
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73 goto invalid;
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74 tidsp_bytes[i] = (decode_hex_digit(cp[0]) << 4) |
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75 decode_hex_digit(cp[1]);
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76 cp += 2;
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77 }
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78 /* bit 2 of status word 0 is BFI */
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79 if (status_words[0] & 0x0004)
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80 fwrite(bfi_marker, 1, 2, outf);
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81 else {
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82 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
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83 fwrite(libgsm_bytes, 1, 33, outf);
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84 }
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85 }
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86 exit(0);
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87 }