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annotate libtwamr/a_refl.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 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 : a_refl.c
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11 * Purpose : Convert from direct form coefficients to
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12 * reflection coefficients
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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 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "a_refl.h"
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23
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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 * LOCAL VARIABLES AND TABLES
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39 ********************************************************************************
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40 */
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41
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42 /*
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43 ********************************************************************************
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44 * PUBLIC PROGRAM CODE
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45 ********************************************************************************
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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 * Function : A_Refl
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51 *
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52 **************************************************************************
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53 */
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54 void A_Refl(
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55 Word16 a[], /* i : Directform coefficients */
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56 Word16 refl[] /* o : Reflection coefficients */
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57 )
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58 {
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59 /* local variables */
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60 Word16 i,j;
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61 Word16 aState[M];
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62 Word16 bState[M];
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63 Word16 normShift;
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64 Word16 normProd;
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65 Word32 L_acc;
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66 Word16 scale;
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67 Word32 L_temp;
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68 Word16 temp;
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69 Word16 mult;
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70
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71 /* initialize states */
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72 for (i = 0; i < M; i++)
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73 {
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74 aState[i] = a[i]; move16 ();
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75 }
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76
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77 /* backward Levinson recursion */
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78 for (i = M-1; i >= 0; i--)
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79 {
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80 if (sub(abs_s(aState[i]), 4096) >= 0)
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81 {
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82 goto ExitRefl;
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83 }
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84
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85 refl[i] = shl(aState[i], 3);
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86
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87 L_temp = L_mult(refl[i], refl[i]);
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88 L_acc = L_sub(MAX_32, L_temp);
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89
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90 normShift = norm_l(L_acc);
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91 scale = sub(15, normShift);
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92
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93 L_acc = L_shl(L_acc, normShift);
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94 normProd = round(L_acc);
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95
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96 mult = div_s(16384, normProd);
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97
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98 for (j = 0; j < i; j++)
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99 {
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100 L_acc = L_deposit_h(aState[j]);
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101 L_acc = L_msu(L_acc, refl[i], aState[i-j-1]);
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102
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103 temp = round(L_acc);
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104 L_temp = L_mult(mult, temp);
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105 L_temp = L_shr_r(L_temp, scale);
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106
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107 if (L_sub(L_abs(L_temp), 32767) > 0)
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108 {
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109 goto ExitRefl;
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110 }
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111
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112 bState[j] = extract_l(L_temp);
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113 }
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114
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115 for (j = 0; j < i; j++)
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116 {
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117 aState[j] = bState[j]; move16 ();
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118 }
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119 }
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120 return;
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121
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122 ExitRefl:
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123 for (i = 0; i < M; i++)
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124 {
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125 refl[i] = 0; move16 ();
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126 }
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127 }