FreeCalypso > hg > gsm-codec-lib
comparison frtest/cvt-dlcap.c @ 19:7960744ba19c
frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 20 Nov 2022 06:11:16 +0000 |
parents | |
children | b7ea278390eb |
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18:39dbaccc349d | 19:7960744ba19c |
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1 /* | |
2 * This program reads a TCH downlink capture produced with FreeCalypso tools | |
3 * (fw version with TCH downlink sniffing feature and fc-shell tch record) | |
4 * and converts it into our extended-libgsm binary format, to be further | |
5 * fed to gsmfr-decode. | |
6 */ | |
7 | |
8 #include <sys/types.h> | |
9 #include <ctype.h> | |
10 #include <stdio.h> | |
11 #include <stdlib.h> | |
12 | |
13 static const char bfi_marker[2] = {0xBF, 0x00}; | |
14 | |
15 static | |
16 decode_hex_digit(ch) | |
17 { | |
18 if (isdigit(ch)) | |
19 return(ch - '0'); | |
20 else if (isupper(ch)) | |
21 return(ch - 'A' + 10); | |
22 else | |
23 return(ch - 'a' + 10); | |
24 } | |
25 | |
26 main(argc, argv) | |
27 char **argv; | |
28 { | |
29 FILE *inf, *outf; | |
30 char linebuf[128]; | |
31 int lineno; | |
32 char *cp; | |
33 int i; | |
34 u_short status_words[3]; | |
35 u_char tidsp_bytes[33], libgsm_bytes[33]; | |
36 | |
37 if (argc != 3) { | |
38 fprintf(stderr, "usage: %s infile outfile\n", argv[0]); | |
39 exit(1); | |
40 } | |
41 inf = fopen(argv[1], "r"); | |
42 if (!inf) { | |
43 perror(argv[1]); | |
44 exit(1); | |
45 } | |
46 outf = fopen(argv[2], "w"); | |
47 if (!outf) { | |
48 perror(argv[2]); | |
49 exit(1); | |
50 } | |
51 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) { | |
52 /* grok DSP status words */ | |
53 cp = linebuf; | |
54 for (i = 0; i < 3; i++) { | |
55 if (!isxdigit(cp[0]) || !isxdigit(cp[1]) || | |
56 !isxdigit(cp[2]) || !isxdigit(cp[3])) { | |
57 invalid: fprintf(stderr, | |
58 "error: %s is not in the expected format\n", | |
59 argv[1]); | |
60 exit(1); | |
61 } | |
62 status_words[i] = (decode_hex_digit(cp[0]) << 12) | | |
63 (decode_hex_digit(cp[1]) << 8) | | |
64 (decode_hex_digit(cp[2]) << 4) | | |
65 decode_hex_digit(cp[3]); | |
66 cp += 4; | |
67 if (*cp++ != ' ') | |
68 goto invalid; | |
69 } | |
70 /* read the frame bits */ | |
71 for (i = 0; i < 33; i++) { | |
72 if (!isxdigit(cp[0]) || !isxdigit(cp[1])) | |
73 goto invalid; | |
74 tidsp_bytes[i] = (decode_hex_digit(cp[0]) << 4) | | |
75 decode_hex_digit(cp[1]); | |
76 cp += 2; | |
77 } | |
78 /* bit 2 of status word 0 is BFI */ | |
79 if (status_words[0] & 0x0004) | |
80 fwrite(bfi_marker, 1, 2, outf); | |
81 else { | |
82 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes); | |
83 fwrite(libgsm_bytes, 1, 33, outf); | |
84 } | |
85 } | |
86 exit(0); | |
87 } |