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annotate libtwamr/calc_cor.c @ 498:65f672c43dc8

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libgsmhr1/typedefs.h: import original
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 19 Jun 2024 00:49:48 +0000
parents 67c31802392b
children
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67c31802392b libtwamr: integrate calc_cor.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 : calc_cor.c
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11 * Purpose : Calculate all correlations for prior the OL LTP
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12 *
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13 ********************************************************************************
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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 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "calc_cor.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "oper_32b.h"
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32 #include "no_count.h"
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33 #include "cnst.h"
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34
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35 /*
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36 ********************************************************************************
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37 * PUBLIC PROGRAM CODE
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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 * FUNCTION: comp_corr
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43 *
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44 * PURPOSE: Calculate all correlations of scal_sig[] in a given delay
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45 * range.
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46 *
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47 * DESCRIPTION:
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48 * The correlation is given by
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49 * cor[t] = <scal_sig[n],scal_sig[n-t]>, t=lag_min,...,lag_max
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50 * The functions outputs the all correlations
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51 *
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52 *************************************************************************/
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53 void comp_corr (
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54 Word16 scal_sig[], /* i : scaled signal. */
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55 Word16 L_frame, /* i : length of frame to compute pitch */
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56 Word16 lag_max, /* i : maximum lag */
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57 Word16 lag_min, /* i : minimum lag */
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58 Word32 corr[]) /* o : correlation of selected lag */
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59 {
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60 Word16 i, j;
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61 Word16 *p, *p1;
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62 Word32 t0;
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63
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64 for (i = lag_max; i >= lag_min; i--)
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65 {
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66 p = scal_sig; move16 ();
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67 p1 = &scal_sig[-i]; move16 ();
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68 t0 = 0; move32 ();
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69
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70 for (j = 0; j < L_frame; j++, p++, p1++)
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71 {
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72 t0 = L_mac (t0, *p, *p1);
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73 }
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74 corr[-i] = t0; move32 ();
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75 }
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76
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77 return;
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78 }