FreeCalypso > hg > vband-misc

annotate hr-sid/sidgen.c @ 55:f27bc1e17311

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
fr-sid/goodsp-frame41.gsmx: starting point This 33-byte binary file contains frame #41 from good_sp.cod from GSM 06.32 test sequence set, converted from ETSI *.cod format into our gsmx format. This frame is an example of a real FRv1 SID.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 22 Aug 2024 05:00:08 +0000
parents 5c82f2e56d56
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
45
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * This program generates a sequence of GSM-HR codec frames in raw packed
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 * format (aka TS 101 318) that aims to reverse-engineer the logic of
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 * the SID detector in TI Calypso DSP, and maybe later in historical
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 * E1 BTS implementations too.
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 */
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 #include <stdio.h>
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 #include <stdint.h>
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 #include <stdlib.h>
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 #include <string.h>
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 #include <strings.h>
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 static const uint8_t perfect_sid[14] = {
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 0x11, 0x22, 0x33, 0x44, 0xFF, 0xFF, 0xFF,
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 };
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 static void
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 clear_bit(buf, num)
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 uint8_t *buf;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 unsigned num;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 {
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 unsigned nbyte = num / 8;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 unsigned nbit = num % 8;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 unsigned mask = 0x80 >> nbit;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 buf[nbyte] &= ~mask;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 }
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 static void
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 corrupt_class1_bit(buf, num)
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 uint8_t *buf;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 unsigned num;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 {
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 clear_bit(buf, num + 36);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 }
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 static void
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 corrupt_class2_bit(buf, num)
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 uint8_t *buf;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 unsigned num;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 {
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 if (num < 8)
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 clear_bit(buf, num + 81);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 else
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 clear_bit(buf, (num - 8) + 98);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 }
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 main(argc, argv)
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 char **argv;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 {
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 FILE *outf;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 uint8_t class1[14], class2[14];
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 unsigned n1, n2;
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 if (argc != 2) {
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 fprintf(stderr, "usage: %s outfile\n", argv[0]);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 exit(1);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 }
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 outf = fopen(argv[1], "w");
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 if (!outf) {
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 perror(argv[1]);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64 exit(1);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 }
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66 bcopy(perfect_sid, class1, 14);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67 for (n1 = 0; n1 < 20; n1++) {
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68 bcopy(class1, class2, 14);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 for (n2 = 0; n2 < 17; n2++) {
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 fwrite(class2, 1, 14, outf);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
71 corrupt_class2_bit(class2, n2);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
72 }
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
73 fwrite(class2, 1, 14, outf);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
74 corrupt_class1_bit(class1, n1);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75 }
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
76 fclose(outf);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
77 exit(0);
5c82f2e56d56 hr-sid: hack created
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
78 }