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annotate libgsmfrp/bad_frame.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents 2361a7d8c1eb
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);
6
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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 }