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comparison trau-decode/extr-efr.c @ 9:0565aaa84b17

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trau-decode: implement trau-extr program
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 24 May 2024 19:44:14 +0000
parents trau-decode/parse-efr.c@bf5c9fb431b8
children
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8:85662304252e 9:0565aaa84b17
1 /*
2 * This module implements the EFR decoding part of trau-extr.
3 */
4
5 #include <stdio.h>
6 #include <stdint.h>
7 #include <stdlib.h>
8 #include <string.h>
9 #include <strings.h>
10 #include <gsm_efr.h>
11 #include "osmo_bits.h"
12
13 static void
14 dbits_to_frame(d_bits, frame)
15 ubit_t *d_bits;
16 uint8_t *frame;
17 {
18 ubit_t intermed[248], *ip;
19 uint8_t *op, mask;
20 unsigned nb;
21
22 intermed[0] = 1;
23 intermed[1] = 1;
24 intermed[2] = 0;
25 intermed[3] = 0;
26 bcopy(d_bits + 1, intermed + 4, 38);
27 bcopy(d_bits + 42, intermed + 42, 53);
28 bcopy(d_bits + 98, intermed + 95, 50);
29 bcopy(d_bits + 151, intermed + 145, 53);
30 bcopy(d_bits + 207, intermed + 198, 50);
31 ip = intermed;
32 op = frame;
33 for (nb = 0; nb < EFR_RTP_FRAME_LEN; nb++) {
34 *op = 0;
35 for (mask = 0x80; mask; mask >>= 1) {
36 if (*ip)
37 *op |= mask;
38 ip++;
39 }
40 op++;
41 }
42 }
43
44 void
45 convert_efr_frame(d_bits, outf)
46 ubit_t *d_bits;
47 FILE *outf;
48 {
49 uint8_t frame[EFR_RTP_FRAME_LEN];
50
51 dbits_to_frame(d_bits, frame);
52 fwrite(frame, 1, EFR_RTP_FRAME_LEN, outf);
53 }