annotate tchtools/fc-tch2fr.c @ 960:411d1cc14326

sms-pdu-decode family: prepare for SC address becoming optional
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 04 Aug 2023 23:09:12 +0000
parents a7ad6b39e01b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
903
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
2 * This program reads TCH downlink capture files in the old format from 2016
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
3 * (the format which fc-shell tch record will write if the firmware running
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
4 * on the Calypso GSM device is an old version that emits TCH DL bits in
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
5 * the old format from 2016), completely *disregards* all 3 status words
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
6 * including the essential word of control flags, converts the 260-bit
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
7 * payload portion of each frame into standard libgsm/RTP format, and
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
8 * writes the result into a .gsm binary file.
6
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 *
903
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
10 * This program was written in 2016, at that time we (FreeCalypso team)
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
11 * did not have a proper understanding of how the complete TCH DL processing
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
12 * chain works - we particularly missed the Rx DTX handler block that MUST
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
13 * be present between the output of the GSM 05.03 channel decoder and the
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
14 * input to the GSM 06.10 speech decoder - and therefore the function
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
15 * performed by this program is a bogo-transform.
6
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 *
903
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
17 * This bogo-transform program is kept as part of FC host tools package
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
18 * only for backward compatibility - for actual decoding of TCH DL captures,
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
19 * please use our new gsmfr-dlcap-* and gsmefr-dlcap-* utilities that are
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
20 * maintained as part of Themyscira Wireless GSM codec libraries & utilities
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
diff changeset
21 * package.
6
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 */
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 #include <sys/types.h>
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 #include <ctype.h>
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 #include <stdio.h>
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 #include <stdlib.h>
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 static
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 decode_hex_digit(ch)
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 if (isdigit(ch))
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 return(ch - '0');
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 else if (isupper(ch))
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 return(ch - 'A' + 10);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 else
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 return(ch - 'a' + 10);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 main(argc, argv)
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 char **argv;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 FILE *inf, *outf;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 char linebuf[128];
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 int lineno;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 char *cp;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 int i, j;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 u_char tidsp_bytes[33], libgsm_bytes[33];
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 if (argc != 3) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 exit(1);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 inf = fopen(argv[1], "r");
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 if (!inf) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 perror(argv[1]);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 exit(1);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 outf = fopen(argv[2], "w");
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 if (!outf) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 perror(argv[2]);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 exit(1);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 /* skip DSP status words */
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66 cp = linebuf;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67 for (i = 0; i < 3; i++) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68 for (j = 0; j < 4; j++) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 if (!isxdigit(*cp++)) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 invalid: fprintf(stderr,
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
71 "error: %s is not in the expected format\n",
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
72 argv[1]);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
73 exit(1);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
74 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
76 if (*cp++ != ' ')
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
77 goto invalid;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
78 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
79 /* read the frame bits */
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
80 for (i = 0; i < 33; i++) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
81 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
82 goto invalid;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
83 tidsp_bytes[i] = (decode_hex_digit(cp[0]) << 4) |
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
84 decode_hex_digit(cp[1]);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
85 cp += 2;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
86 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
87 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
88 fwrite(libgsm_bytes, 1, 33, outf);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
89 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
90 exit(0);
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
91 }