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annotate libtwamr/syn_filt.c @ 394:2af94ba0c075

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libtwamr: integrate syn_filt.c
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 06 May 2024 18:49:17 +0000
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2af94ba0c075 libtwamr: integrate syn_filt.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 : syn_filt.c
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11 * Purpose : Perform synthesis filtering through 1/A(z).
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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 * MODULE INCLUDE FILE AND VERSION ID
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18 ********************************************************************************
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19 */
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20 #include "namespace.h"
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21 #include "syn_filt.h"
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22
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23 /*
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24 ********************************************************************************
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25 * INCLUDE FILES
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26 ********************************************************************************
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27 */
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28 #include "typedef.h"
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29 #include "basic_op.h"
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30 #include "no_count.h"
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31 #include "cnst.h"
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32
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33 /*
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34 ********************************************************************************
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35 * LOCAL VARIABLES AND TABLES
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36 ********************************************************************************
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37 */
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38 /*
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39 *--------------------------------------*
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40 * Constants (defined in cnst.h *
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41 *--------------------------------------*
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42 * M : LPC order *
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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 ********************************************************************************
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48 * PUBLIC PROGRAM CODE
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49 ********************************************************************************
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50 */
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51 void Syn_filt (
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52 Word16 a[], /* (i) : a[M+1] prediction coefficients (M=10) */
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53 Word16 x[], /* (i) : input signal */
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54 Word16 y[], /* (o) : output signal */
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55 Word16 lg, /* (i) : size of filtering */
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56 Word16 mem[], /* (i/o) : memory associated with this filtering. */
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57 Word16 update /* (i) : 0=no update, 1=update of memory. */
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58 )
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59 {
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60 Word16 i, j;
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61 Word32 s;
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62 Word16 tmp[80]; /* This is usually done by memory allocation (lg+M) */
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63 Word16 *yy;
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64
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65 /* Copy mem[] to yy[] */
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66
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67 yy = tmp; move16 ();
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68
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69 for (i = 0; i < M; i++)
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70 {
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71 *yy++ = mem[i]; move16 ();
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72 }
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73
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74 /* Do the filtering. */
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75
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76 for (i = 0; i < lg; i++)
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77 {
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78 s = L_mult (x[i], a[0]);
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79 for (j = 1; j <= M; j++)
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80 {
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81 s = L_msu (s, a[j], yy[-j]);
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82 }
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83 s = L_shl (s, 3);
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84 *yy++ = round (s); move16 ();
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85 }
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86
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87 for (i = 0; i < lg; i++)
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88 {
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89 y[i] = tmp[i + M]; move16 ();
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90 }
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91
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92 /* Update of memory if update==1 */
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93
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94 test ();
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95 if (update != 0)
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96 {
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97 for (i = 0; i < M; i++)
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98 {
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99 mem[i] = y[lg - M + i]; move16 ();
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100 }
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101 }
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102 return;
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103 }