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annotate libtwamr/autocorr.c @ 301:019eed8b1948

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doc/FR1-library-history: new article
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 15 Apr 2024 18:36:21 +0000
parents 07f936338de1
children
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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 : autocorr.c
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11 *
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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 * MODULE INCLUDE FILE AND VERSION ID
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17 ********************************************************************************
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18 */
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19 #include "namespace.h"
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20 #include "autocorr.h"
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21
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22 /*
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23 ********************************************************************************
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24 * INCLUDE FILES
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25 ********************************************************************************
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26 */
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27 #include "typedef.h"
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28 #include "basic_op.h"
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29 #include "oper_32b.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 ********************************************************************************
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41 * PUBLIC PROGRAM CODE
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42 ********************************************************************************
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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 : autocorr
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48 * Purpose : Compute autocorrelations of signal with windowing
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49 *
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50 **************************************************************************
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51 */
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52 Word16 Autocorr (
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53 Word16 x[], /* (i) : Input signal (L_WINDOW) */
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54 Word16 m, /* (i) : LPC order */
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55 Word16 r_h[], /* (o) : Autocorrelations (msb) */
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56 Word16 r_l[], /* (o) : Autocorrelations (lsb) */
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57 const Word16 wind[] /* (i) : window for LPC analysis (L_WINDOW) */
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58 )
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59 {
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60 Word16 i, j, norm;
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61 Word16 y[L_WINDOW];
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62 Word32 sum;
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63 Word16 overfl, overfl_shft;
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64
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65 /* Windowing of signal */
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66
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67 for (i = 0; i < L_WINDOW; i++)
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68 {
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69 y[i] = mult_r (x[i], wind[i]); move16 ();
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70 }
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71
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72 /* Compute r[0] and test for overflow */
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73
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74 overfl_shft = 0; move16 ();
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75
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76 do
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77 {
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78 overfl = 0; move16 ();
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79 sum = 0L; move32 ();
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80
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81 for (i = 0; i < L_WINDOW; i++)
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82 {
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83 sum = L_mac (sum, y[i], y[i]);
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84 }
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85
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86 /* If overflow divide y[] by 4 */
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87
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88 test ();
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89 if (L_sub (sum, MAX_32) == 0L)
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90 {
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91 overfl_shft = add (overfl_shft, 4);
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92 overfl = 1; move16 (); /* Set the overflow flag */
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93
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94 for (i = 0; i < L_WINDOW; i++)
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95 {
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96 y[i] = shr (y[i], 2); move16 ();
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97 }
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98 }
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99 test ();
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100 }
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101 while (overfl != 0);
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102
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103 sum = L_add (sum, 1L); /* Avoid the case of all zeros */
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104
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105 /* Normalization of r[0] */
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106
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107 norm = norm_l (sum);
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108 sum = L_shl (sum, norm);
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109 L_Extract (sum, &r_h[0], &r_l[0]); /* Put in DPF format (see oper_32b) */
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110
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111 /* r[1] to r[m] */
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112
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113 for (i = 1; i <= m; i++)
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114 {
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115 sum = 0; move32 ();
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116
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117 for (j = 0; j < L_WINDOW - i; j++)
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118 {
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119 sum = L_mac (sum, y[j], y[j + i]);
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120 }
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121
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122 sum = L_shl (sum, norm);
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123 L_Extract (sum, &r_h[i], &r_l[i]);
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124 }
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125
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126 norm = sub (norm, overfl_shft);
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127
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128 return norm;
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129 }