FreeCalypso > hg > gsm-net-reveng

annotate trau-decode/extr-efr.c @ 14:98c0881c2af0

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
tfo/find-is-hdr: move here from freecalypso-reveng This little program was developed in freecalypso-reveng Hg repository in 2023-03, when we didn't have a separate repository for network-side reverse eng, but now that we do have separate repositories for FreeCalypso (mobile side) vs network side reverse eng, move TFO RE work to the proper place.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 24 May 2024 21:18:22 +0000
parents 0565aaa84b17
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
9
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents: 5
diff changeset
2 * This module implements the EFR decoding part of trau-extr.
4
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 */
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 #include <stdio.h>
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 #include <stdint.h>
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 #include <stdlib.h>
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 #include <string.h>
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 #include <strings.h>
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 #include <gsm_efr.h>
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 #include "osmo_bits.h"
d9c095357c32 trau-parse: check and report EFR CRC
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12
5
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
13 static void
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
14 dbits_to_frame(d_bits, frame)
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
15 ubit_t *d_bits;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
16 uint8_t *frame;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
17 {
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
18 ubit_t intermed[248], *ip;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
19 uint8_t *op, mask;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
20 unsigned nb;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
21
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
22 intermed[0] = 1;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
23 intermed[1] = 1;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
24 intermed[2] = 0;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
25 intermed[3] = 0;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
26 bcopy(d_bits + 1, intermed + 4, 38);
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
27 bcopy(d_bits + 42, intermed + 42, 53);
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
28 bcopy(d_bits + 98, intermed + 95, 50);
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
29 bcopy(d_bits + 151, intermed + 145, 53);
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
30 bcopy(d_bits + 207, intermed + 198, 50);
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
31 ip = intermed;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
32 op = frame;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
33 for (nb = 0; nb < EFR_RTP_FRAME_LEN; nb++) {
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
34 *op = 0;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
35 for (mask = 0x80; mask; mask >>= 1) {
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
36 if (*ip)
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
37 *op |= mask;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
38 ip++;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
39 }
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
40 op++;
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
41 }
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
42 }
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
43
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
44 void
9
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents: 5
diff changeset
45 convert_efr_frame(d_bits, outf)
5
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
46 ubit_t *d_bits;
9
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents: 5
diff changeset
47 FILE *outf;
5
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
48 {
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
49 uint8_t frame[EFR_RTP_FRAME_LEN];
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
50
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
51 dbits_to_frame(d_bits, frame);
9
0565aaa84b17 trau-decode: implement trau-extr program
Mychaela Falconia <falcon@freecalypso.org>
parents: 5
diff changeset
52 fwrite(frame, 1, EFR_RTP_FRAME_LEN, outf);
5
bf5c9fb431b8 trau-parse: implement EFR decoding
Mychaela Falconia <falcon@freecalypso.org>
parents: 4
diff changeset
53 }