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annotate 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
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1 /*
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2 * In this module we implement our handling of BFI frame gaps.
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3 */
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4
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5 #include <stdint.h>
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6 #include <string.h>
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7 #include "gsm_fr_preproc.h"
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8 #include "internal.h"
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9
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10 static int reduce_xmaxc(gsm_byte *frame)
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11 {
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12 int mute_flag = 1;
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13 unsigned sub, xmaxc;
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14
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15 for (sub = 0; sub < 4; sub++) {
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16 xmaxc = ((frame[sub*7+6] & 0x1F) << 1) | (frame[sub*7+7] >> 7);
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17 if (xmaxc > 4) {
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18 xmaxc -= 4;
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19 mute_flag = 0;
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20 } else
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21 xmaxc = 0;
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22 frame[sub*7+6] &= 0xE0;
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23 frame[sub*7+6] |= xmaxc >> 1;
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24 frame[sub*7+7] &= 0x7F;
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25 frame[sub*7+7] |= (xmaxc & 1) << 7;
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26 }
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27 return mute_flag;
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28 }
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29
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30 static void random_grid_pos(struct gsmfr_preproc_state *st, gsm_byte *frame)
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31 {
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32 unsigned sub, Mc;
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33
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34 for (sub = 0; sub < 4; sub++) {
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35 Mc = gsmfr_preproc_prng(st, 2);
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36 frame[sub*7+6] &= 0x9F;
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37 frame[sub*7+6] |= Mc << 5;
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38 }
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39 }
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40
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41 void gsmfr_preproc_bfi(struct gsmfr_preproc_state *st, int taf, gsm_byte *frame)
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42 {
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43 int mute;
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44
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45 switch (st->rx_state) {
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46 case NO_DATA:
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47 memcpy(frame, &gsmfr_preproc_silence_frame, sizeof(gsm_frame));
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48 return;
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49 case SPEECH:
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50 memcpy(frame, &st->speech_frame, sizeof(gsm_frame));
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51 st->rx_state = SPEECH_MUTING;
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52 return;
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53 case SPEECH_MUTING:
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54 mute = reduce_xmaxc(st->speech_frame);
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55 memcpy(frame, &st->speech_frame, sizeof(gsm_frame));
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56 random_grid_pos(st, frame);
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57 if (mute)
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58 st->rx_state = NO_DATA;
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59 return;
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60 case COMFORT_NOISE:
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61 gsmfr_preproc_gen_cn(st, frame);
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62 if (taf)
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63 st->rx_state = LOST_SID;
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64 return;
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65 case LOST_SID:
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66 gsmfr_preproc_gen_cn(st, frame);
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67 if (taf)
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68 st->rx_state = NO_DATA;
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69 return;
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70 }
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71 }