FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/inter_6.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 63ad83f3d821
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: Interpol_6()
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4 *
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5 * PURPOSE: Interpolating the normalized correlation with 1/6 resolution.
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6 *
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7 *************************************************************************/
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8
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9 #include "gsm_efr.h"
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10 #include "typedef.h"
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11 #include "namespace.h"
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12 #include "basic_op.h"
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13 #include "no_count.h"
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14 #include "codec.h"
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16 #define UP_SAMP 6
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17 #define L_INTERPOL 4
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18 #define FIR_SIZE (UP_SAMP*L_INTERPOL+1)
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20 /* 1/6 resolution interpolation filter (-3 dB at 3600 Hz) */
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22 static const Word16 inter_6[FIR_SIZE] =
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23 {
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24 29519,
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25 28316, 24906, 19838, 13896, 7945, 2755,
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26 -1127, -3459, -4304, -3969, -2899, -1561,
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27 -336, 534, 970, 1023, 823, 516,
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28 220, 0, -131, -194, -215, 0
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29 };
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31 Word16 Interpol_6 ( /* (o) : interpolated value */
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32 Word16 *x, /* (i) : input vector */
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33 Word16 frac /* (i) : fraction */
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34 )
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35 {
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36 Word16 i, k;
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37 Word16 *x1, *x2;
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38 const Word16 *c1, *c2;
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39 Word32 s;
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40
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41 test ();
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42 if (frac < 0)
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43 {
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44 frac = add (frac, UP_SAMP);
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45 x--;
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46 }
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47 x1 = &x[0]; move16 ();
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48 x2 = &x[1]; move16 ();
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49 c1 = &inter_6[frac]; move16 ();
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50 c2 = &inter_6[sub (UP_SAMP, frac)]; move16 ();
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52 s = 0; move32 ();
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53 for (i = 0, k = 0; i < L_INTERPOL; i++, k += UP_SAMP)
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54 {
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55 s = L_mac (s, x1[-i], c1[k]);
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56 s = L_mac (s, x2[i], c2[k]);
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57 }
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59 return round (s);
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60 }