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annotate libgsmefr/reorder.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 9ad6bf2f1ee1
children 0faf23a9286f
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1 /*************************************************************************
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2 *
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3 * FUNCTION: Reorder_lsf()
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4 *
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5 * PURPOSE: To make sure that the LSFs are properly ordered and to keep a
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6 * certain minimum distance between adjacent LSFs. *
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7 * The LSFs are in the frequency range 0-0.5 and represented in Q15
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8 *
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9 *************************************************************************/
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10
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11 #include "gsm_efr.h"
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12 #include "typedef.h"
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13 #include "namespace.h"
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14 #include "basic_op.h"
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15 #include "no_count.h"
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16 #include "sig_proc.h"
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18 void Reorder_lsf (
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19 Word16 *lsf, /* (i/o) : vector of LSFs (range: 0<=val<=0.5) */
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20 Word16 min_dist, /* (i) : minimum required distance */
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21 Word16 n /* (i) : LPC order */
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22 )
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23 {
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24 Word16 i;
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25 Word16 lsf_min;
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27 lsf_min = min_dist; move16 ();
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28 for (i = 0; i < n; i++)
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29 {
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30 test ();
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31 if (sub (lsf[i], lsf_min) < 0)
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32 {
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33 lsf[i] = lsf_min; move16 ();
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34 }
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35 lsf_min = add (lsf[i], min_dist);
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36 }
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37 }