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annotate libtwamr/hp_max.c @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 176a44ff94a1
children
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176a44ff94a1 libtwamr: integrate hp_max.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 : hp_max.c
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11 * Purpose : Find the maximum correlation of scal_sig[] in a given
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12 * delay range.
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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 ********************************************************************************
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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 "hp_max.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 "oper_32b.h"
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33 #include "no_count.h"
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34 #include "cnst.h"
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35
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36 /*
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37 ********************************************************************************
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38 * PUBLIC PROGRAM CODE
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39 ********************************************************************************
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40 */
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41 Word16 hp_max (
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42 Word32 corr[], /* i : correlation vector. */
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43 Word16 scal_sig[], /* i : scaled signal. */
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44 Word16 L_frame, /* i : length of frame to compute pitch */
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45 Word16 lag_max, /* i : maximum lag */
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46 Word16 lag_min, /* i : minimum lag */
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47 Word16 *cor_hp_max) /* o : max high-pass filtered norm. correlation */
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48 {
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49 Word16 i;
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50 Word16 *p, *p1;
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51 Word32 max, t0, t1;
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52 Word16 max16, t016, cor_max;
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53 Word16 shift, shift1, shift2;
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54
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55 max = MIN_32; move32 ();
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56 t0 = 0L; move32 ();
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57
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58 for (i = lag_max-1; i > lag_min; i--)
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59 {
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60 /* high-pass filtering */
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61 t0 = L_sub (L_sub(L_shl(corr[-i], 1), corr[-i-1]), corr[-i+1]);
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62 t0 = L_abs (t0);
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63
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64 test ();
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65 if (L_sub (t0, max) >= 0)
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66 {
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67 max = t0; move32 ();
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68 }
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69 }
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70
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71 /* compute energy */
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72 p = scal_sig; move16 ();
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73 p1 = &scal_sig[0]; move16 ();
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74 t0 = 0L; move32 ();
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75 for (i = 0; i < L_frame; i++, p++, p1++)
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76 {
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77 t0 = L_mac (t0, *p, *p1);
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78 }
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79
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80 p = scal_sig; move16 ();
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81 p1 = &scal_sig[-1]; move16 ();
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82 t1 = 0L; move32 ();
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83 for (i = 0; i < L_frame; i++, p++, p1++)
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84 {
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85 t1 = L_mac (t1, *p, *p1);
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86 }
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87
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88 /* high-pass filtering */
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89 t0 = L_sub(L_shl(t0, 1), L_shl(t1, 1));
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90 t0 = L_abs (t0);
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91
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92 /* max/t0 */
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93 shift1 = sub(norm_l(max), 1);
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94 max16 = extract_h(L_shl(max, shift1));
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95 shift2 = norm_l(t0);
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96 t016 = extract_h(L_shl(t0, shift2));
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97
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98 test ();
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99 if (t016 != 0)
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100 {
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101 cor_max = div_s(max16, t016);
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102 }
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103 else
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104 {
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105 cor_max = 0; move16 ();
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106 }
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107
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108 shift = sub(shift1, shift2);
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109
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110 test ();
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111 if (shift >= 0)
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112 {
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113 *cor_hp_max = shr(cor_max, shift); move16 (); /* Q15 */
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114 }
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115 else
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116 {
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117 *cor_hp_max = shl(cor_max, negate(shift)); move16 (); /* Q15 */
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118 }
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119
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120 return 0;
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121 }