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annotate libtwamr/reorder.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 05a46720af0f
children
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05a46720af0f libtwamr: integrate d_plsf_3.c
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : reorder.c
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11 * Purpose : To make sure that the LSFs are properly ordered
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12 * : and to keep a certain minimum distance between
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13 * : adjacent LSFs.
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14 *
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15 ********************************************************************************
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16 */
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17 /*
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18 ********************************************************************************
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19 * MODULE INCLUDE FILE AND VERSION ID
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20 ********************************************************************************
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21 */
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22 #include "namespace.h"
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23 #include "reorder.h"
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24
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25 /*
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26 ********************************************************************************
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27 * INCLUDE FILES
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28 ********************************************************************************
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29 */
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30 #include "typedef.h"
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31 #include "basic_op.h"
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32 #include "no_count.h"
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33
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34 /*
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35 ********************************************************************************
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36 * LOCAL VARIABLES AND TABLES
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37 ********************************************************************************
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38 */
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39
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40 /*
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41 ********************************************************************************
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42 * PUBLIC PROGRAM CODE
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43 ********************************************************************************
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44 */
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45 /*************************************************************************
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46 *
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47 * FUNCTION: Reorder_lsf()
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48 *
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49 * PURPOSE: To make sure that the LSFs are properly ordered and to keep a
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50 * certain minimum distance between adjacent LSFs.
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51 *
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52 * The LSFs are in the frequency range 0-0.5 and represented in Q15
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53 *
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54 *************************************************************************/
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55 void Reorder_lsf (
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56 Word16 *lsf, /* (i/o) : vector of LSFs (range: 0<=val<=0.5) */
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57 Word16 min_dist, /* (i) : minimum required distance */
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58 Word16 n /* (i) : LPC order */
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59 )
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60 {
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61 Word16 i;
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62 Word16 lsf_min;
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63
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64 lsf_min = min_dist; move16 ();
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65 for (i = 0; i < n; i++)
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66 {
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67 test ();
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68 if (sub (lsf[i], lsf_min) < 0)
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69 {
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70 lsf[i] = lsf_min; move16 ();
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71 }
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72 lsf_min = add (lsf[i], min_dist);
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73 }
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74 }