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comparison libgsmfrp/bad_frame.c @ 109:2361a7d8c1eb

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libgsmfrp: randomize grid position params when muting speech, following GSM 06.11 example solution in more detail
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 28 Nov 2022 04:15:20 +0000
parents b2255a5d0519
children f081a6850fb5
comparison
equal deleted inserted replaced
108:3b64f255689a 109:2361a7d8c1eb
25 frame[sub*7+7] |= (xmaxc & 1) << 7; 25 frame[sub*7+7] |= (xmaxc & 1) << 7;
26 } 26 }
27 return mute_flag; 27 return mute_flag;
28 } 28 }
29 29
30 static void random_grid_pos(struct gsmfr_preproc_state *st, gsm_byte *frame)
31 {
32 unsigned sub, Mc;
33
34 for (sub = 0; sub < 4; sub++) {
35 Mc = gsmfr_preproc_prng(st, 2);
36 frame[sub*7+6] &= 0x9F;
37 frame[sub*7+6] |= Mc << 5;
38 }
39 }
40
30 void gsmfr_preproc_bfi(struct gsmfr_preproc_state *st, int taf, gsm_byte *frame) 41 void gsmfr_preproc_bfi(struct gsmfr_preproc_state *st, int taf, gsm_byte *frame)
31 { 42 {
32 int mute; 43 int mute;
33 44
34 switch (st->rx_state) { 45 switch (st->rx_state) {
40 st->rx_state = SPEECH_MUTING; 51 st->rx_state = SPEECH_MUTING;
41 return; 52 return;
42 case SPEECH_MUTING: 53 case SPEECH_MUTING:
43 mute = reduce_xmaxc(st->speech_frame); 54 mute = reduce_xmaxc(st->speech_frame);
44 memcpy(frame, &st->speech_frame, sizeof(gsm_frame)); 55 memcpy(frame, &st->speech_frame, sizeof(gsm_frame));
56 random_grid_pos(st, frame);
45 if (mute) 57 if (mute)
46 st->rx_state = NO_DATA; 58 st->rx_state = NO_DATA;
47 return; 59 return;
48 case COMFORT_NOISE: 60 case COMFORT_NOISE:
49 gsmfr_preproc_gen_cn(st, frame); 61 gsmfr_preproc_gen_cn(st, frame);