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annotate libtwamr/ex_ctrl.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +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 }