FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/ex_ctrl.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 3f27ca24c620
children
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1 /*************************************************************************
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2 *
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3 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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4 * R99 Version 3.3.0
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5 * REL-4 Version 4.1.0
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6 *
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7 ********************************************************************************
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8 *
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9 * File : ex_ctrl.c
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10 * Purpose : Excitation Control module in background noise
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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 ********************************************************************************
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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 "ex_ctrl.h"
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22
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23 #include "typedef.h"
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24 #include "basic_op.h"
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25 #include "no_count.h"
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26 #include "cnst.h"
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27 #include "memops.h"
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28 #include "gmed_n.h"
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29 #include "sqrt_l.h"
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30
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31 /*
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32 ********************************************************************************
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33 * LOCAL VARIABLES AND TABLES
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34 ********************************************************************************
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35 */
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36 /*-----------------------------------------------------------------*
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37 * Decoder constant parameters (defined in "cnst.h") *
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38 *-----------------------------------------------------------------*
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39 * L_FRAME : Frame size. *
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40 * L_SUBFR : Sub-frame size. *
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41 *-----------------------------------------------------------------*/
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42
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43 /*
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44 ********************************************************************************
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45 * PUBLIC PROGRAM CODE
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46 ********************************************************************************
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47 */
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48
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49 /*
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50 **************************************************************************
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51 *
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52 * Function : Ex_ctrl
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53 * Purpose : Charaterice synthesis speech and detect background noise
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54 * Returns : background noise decision; 0 = no bgn, 1 = bgn
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55 *
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56 **************************************************************************
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57 */
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58 Word16 Ex_ctrl (Word16 excitation[], /*i/o: Current subframe excitation */
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59 Word16 excEnergy, /* i : Exc. Energy, sqrt(totEx*totEx)*/
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60 Word16 exEnergyHist[], /* i : History of subframe energies */
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61 Word16 voicedHangover, /* i : # of fr. after last voiced fr.*/
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62 Word16 prevBFI, /* i : Set i previous BFI */
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63 Word16 carefulFlag /* i : Restrict dymamic in scaling */
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64 )
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65 {
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66 Word16 i, exp;
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67 Word16 testEnergy, scaleFactor, avgEnergy, prevEnergy;
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68 Word32 t0;
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69
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70 /* get target level */
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71 avgEnergy = gmed_n(exEnergyHist, 9); move16();
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72
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73 prevEnergy = shr( add (exEnergyHist[7], exEnergyHist[8]) ,1);
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74
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75 test ();
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76 if ( sub (exEnergyHist[8], prevEnergy) < 0)
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77 {
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78 prevEnergy = exEnergyHist[8]; move16 ();
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79 }
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80
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81 /* upscaling to avoid too rapid energy rises for some cases */
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82 test (); test ();
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83 if ( sub (excEnergy, avgEnergy) < 0 && sub (excEnergy, 5) > 0)
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84 {
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85 testEnergy = shl(prevEnergy, 2); /* testEnergy = 4*prevEnergy; */
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86
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87 test (); test ();
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88 if ( sub (voicedHangover, 7) < 0 || prevBFI != 0 )
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89 {
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90 /* testEnergy = 3*prevEnergy */
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91 testEnergy = sub (testEnergy, prevEnergy);
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92 }
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93
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94 test ();
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95 if ( sub (avgEnergy, testEnergy) > 0)
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96 {
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97 avgEnergy = testEnergy; move16 ();
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98 }
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99
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100 /* scaleFactor=avgEnergy/excEnergy in Q0 (const 29 below)*/
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101 exp = norm_s (excEnergy);
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102 excEnergy = shl (excEnergy, exp);
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103 excEnergy = div_s ((Word16) 16383, excEnergy);
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104 t0 = L_mult (avgEnergy, excEnergy);
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105 t0 = L_shr (t0, sub (20, exp)); /* const=30 for t0 in Q0, 20 for Q10 */
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106 if ( L_sub(t0, 32767) > 0 )
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107 {
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108 t0 = 32767; move32 (); /* saturate */
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109 }
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110 scaleFactor = extract_l (t0);
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111
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112 /* test if scaleFactor > 3.0 */
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113 test (); test ();
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114 if ( carefulFlag != 0 && sub(scaleFactor, 3072) > 0 )
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115 {
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116 scaleFactor = 3072; move16 ();
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117 }
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118
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119 /* scale the excitation by scaleFactor */
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120 for (i = 0; i < L_SUBFR; i++)
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121 {
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122 t0 = L_mult (scaleFactor, excitation[i]);
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123 t0 = L_shr (t0, 11);
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124 excitation[i] = extract_l (t0);
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125 }
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126 }
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127
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128 return 0;
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129 }