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annotate libtwamr/g_code.c @ 454:4b6fa53a8240

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INSTALL: document the new way
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 10 May 2024 06:19:24 +0000
parents 1588a7d9e732
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 : g_code.c
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11 * Purpose : Compute the innovative codebook gain.
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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 "g_code.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 ********************************************************************************
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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 * FUNCTION: G_code
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47 *
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48 * PURPOSE: Compute the innovative codebook gain.
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49 *
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50 * DESCRIPTION:
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51 * The innovative codebook gain is given by
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52 *
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53 * g = <x[], y[]> / <y[], y[]>
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54 *
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55 * where x[] is the target vector, y[] is the filtered innovative
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56 * codevector, and <> denotes dot product.
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57 *
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58 *************************************************************************/
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59 Word16 G_code ( /* out : Gain of innovation code */
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60 Word16 xn2[], /* in : target vector */
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61 Word16 y2[] /* in : filtered innovation vector */
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62 )
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63 {
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64 Word16 i;
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65 Word16 xy, yy, exp_xy, exp_yy, gain;
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66 Word16 scal_y2[L_SUBFR];
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67 Word32 s;
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68
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69 /* Scale down Y[] by 2 to avoid overflow */
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70
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71 for (i = 0; i < L_SUBFR; i++)
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72 {
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73 scal_y2[i] = shr (y2[i], 1); move16 ();
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74 }
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75
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76 /* Compute scalar product <X[],Y[]> */
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77
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78 s = 1L; move32 (); /* Avoid case of all zeros */
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79 for (i = 0; i < L_SUBFR; i++)
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80 {
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81 s = L_mac (s, xn2[i], scal_y2[i]);
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82 }
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83 exp_xy = norm_l (s);
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84 xy = extract_h (L_shl (s, exp_xy));
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85
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86 /* If (xy < 0) gain = 0 */
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87
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88 test ();
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89 if (xy <= 0)
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90 return ((Word16) 0);
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91
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92 /* Compute scalar product <Y[],Y[]> */
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93
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94 s = 0L; move32 ();
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95 for (i = 0; i < L_SUBFR; i++)
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96 {
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97 s = L_mac (s, scal_y2[i], scal_y2[i]);
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98 }
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99 exp_yy = norm_l (s);
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100 yy = extract_h (L_shl (s, exp_yy));
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101
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102 /* compute gain = xy/yy */
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103
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104 xy = shr (xy, 1); /* Be sure xy < yy */
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105 gain = div_s (xy, yy);
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106
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107 /* Denormalization of division */
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108 i = add (exp_xy, 5); /* 15-1+9-18 = 5 */
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109 i = sub (i, exp_yy);
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110
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111 gain = shl (shr (gain, i), 1); /* Q0 -> Q1 */
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112
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113 return (gain);
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114 }