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annotate libgsmefr/pred_lt6.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 db8e0b69a6bb
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: Pred_lt_6()
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4 *
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5 * PURPOSE: Compute the result of long term prediction with fractional
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6 * interpolation of resolution 1/6. (Interpolated past excitation).
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7 *
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8 * DESCRIPTION:
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9 * The past excitation signal at the given delay is interpolated at
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10 * the given fraction to build the adaptive codebook excitation.
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11 * On return exc[0..L_subfr-1] contains the interpolated signal
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12 * (adaptive codebook excitation).
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13 *
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14 *************************************************************************/
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15
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16 #include "gsm_efr.h"
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17 #include "typedef.h"
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18 #include "namespace.h"
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19 #include "basic_op.h"
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20 #include "no_count.h"
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21 #include "codec.h"
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22
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23 #define UP_SAMP 6
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24 #define L_INTERPOL 10
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25 #define FIR_SIZE (UP_SAMP*L_INTERPOL+1)
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27 /* 1/6 resolution interpolation filter (-3 dB at 3600 Hz) */
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28
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29 static const Word16 inter_6[FIR_SIZE] =
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30 {
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31 29443,
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32 28346, 25207, 20449, 14701, 8693, 3143,
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33 -1352, -4402, -5865, -5850, -4673, -2783,
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34 -672, 1211, 2536, 3130, 2991, 2259,
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35 1170, 0, -1001, -1652, -1868, -1666,
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36 -1147, -464, 218, 756, 1060, 1099,
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37 904, 550, 135, -245, -514, -634,
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38 -602, -451, -231, 0, 191, 308,
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39 340, 296, 198, 78, -36, -120,
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40 -163, -165, -132, -79, -19, 34,
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41 73, 91, 89, 70, 38, 0
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42 };
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43
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44 void Pred_lt_6 (
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45 Word16 exc[], /* in/out: excitation buffer */
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46 Word16 T0, /* input : integer pitch lag */
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47 Word16 frac, /* input : fraction of lag */
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48 Word16 L_subfr /* input : subframe size */
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49 )
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50 {
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51 Word16 i, j, k;
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52 Word16 *x0, *x1, *x2;
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53 const Word16 *c1, *c2;
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54 Word32 s;
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56 x0 = &exc[-T0]; move16 ();
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57
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58 frac = negate (frac);
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59 test ();
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60 if (frac < 0)
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61 {
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62 frac = add (frac, UP_SAMP);
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63 x0--;
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64 }
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65 for (j = 0; j < L_subfr; j++)
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66 {
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67 x1 = x0++; move16 ();
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68 x2 = x0; move16 ();
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69 c1 = &inter_6[frac];
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70 c2 = &inter_6[sub (UP_SAMP, frac)];
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71
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72 s = 0; move32 ();
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73 for (i = 0, k = 0; i < L_INTERPOL; i++, k += UP_SAMP)
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74 {
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75 s = L_mac (s, x1[-i], c1[k]);
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76 s = L_mac (s, x2[i], c2[k]);
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77 }
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78
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79 exc[j] = round (s); move16 ();
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80 }
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81
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82 return;
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83 }