FreeCalypso > hg > gsm-codec-lib

annotate libgsmfrp/bad_frame.c @ 232:8710c94df334

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
miscutil: new program pcm8-to-pcm16
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 07 May 2023 19:03:36 +0000
parents 2361a7d8c1eb
children f081a6850fb5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * In this module we implement our handling of BFI frame gaps.
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 */
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 #include <stdint.h>
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 #include <string.h>
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 #include "gsm_fr_preproc.h"
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 #include "internal.h"
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 static int reduce_xmaxc(gsm_byte *frame)
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 {
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 int mute_flag = 1;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 unsigned sub, xmaxc;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 for (sub = 0; sub < 4; sub++) {
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 xmaxc = ((frame[sub*7+6] & 0x1F) << 1) | (frame[sub*7+7] >> 7);
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 if (xmaxc > 4) {
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 xmaxc -= 4;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 mute_flag = 0;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 } else
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 xmaxc = 0;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 frame[sub*7+6] &= 0xE0;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 frame[sub*7+6] |= xmaxc >> 1;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 frame[sub*7+7] &= 0x7F;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 frame[sub*7+7] |= (xmaxc & 1) << 7;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 }
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 return mute_flag;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 }
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29
109
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
30 static void random_grid_pos(struct gsmfr_preproc_state *st, gsm_byte *frame)
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
31 {
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
32 unsigned sub, Mc;
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
33
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
34 for (sub = 0; sub < 4; sub++) {
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
35 Mc = gsmfr_preproc_prng(st, 2);
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
36 frame[sub*7+6] &= 0x9F;
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
37 frame[sub*7+6] |= Mc << 5;
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
38 }
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
39 }
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
40
6
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 void gsmfr_preproc_bfi(struct gsmfr_preproc_state *st, int taf, gsm_byte *frame)
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 {
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 int mute;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 switch (st->rx_state) {
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 case NO_DATA:
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 memcpy(frame, &gsmfr_preproc_silence_frame, sizeof(gsm_frame));
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 return;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 case SPEECH:
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 memcpy(frame, &st->speech_frame, sizeof(gsm_frame));
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 st->rx_state = SPEECH_MUTING;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 return;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 case SPEECH_MUTING:
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 mute = reduce_xmaxc(st->speech_frame);
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 memcpy(frame, &st->speech_frame, sizeof(gsm_frame));
109
2361a7d8c1eb libgsmfrp: randomize grid position params when muting speech,
Mychaela Falconia <falcon@freecalypso.org>
parents: 6
diff changeset
56 random_grid_pos(st, frame);
6
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 if (mute)
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 st->rx_state = NO_DATA;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 return;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 case COMFORT_NOISE:
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 gsmfr_preproc_gen_cn(st, frame);
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 if (taf)
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 st->rx_state = LOST_SID;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64 return;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 case LOST_SID:
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66 gsmfr_preproc_gen_cn(st, frame);
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67 if (taf)
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68 st->rx_state = NO_DATA;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 return;
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 }
b2255a5d0519 libgsmfrp: implement BFI handling
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
71 }