FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/reorder.c @ 107:41f1ae68d253

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amr2efr & efr2amr cosmetic: cleaner approach to bit reshuffling
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 27 Nov 2022 21:02:07 +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 }