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annotate libtwamr/autocorr.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 : autocorr.c
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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 * MODULE INCLUDE FILE AND VERSION ID
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17 ********************************************************************************
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18 */
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19 #include "namespace.h"
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20 #include "autocorr.h"
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21
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22 /*
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23 ********************************************************************************
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24 * INCLUDE FILES
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25 ********************************************************************************
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26 */
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27 #include "typedef.h"
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28 #include "basic_op.h"
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29 #include "oper_32b.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 *
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47 * Function : autocorr
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48 * Purpose : Compute autocorrelations of signal with windowing
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49 *
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50 **************************************************************************
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51 */
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52 Word16 Autocorr (
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53 Word16 x[], /* (i) : Input signal (L_WINDOW) */
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54 Word16 m, /* (i) : LPC order */
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55 Word16 r_h[], /* (o) : Autocorrelations (msb) */
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56 Word16 r_l[], /* (o) : Autocorrelations (lsb) */
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57 const Word16 wind[] /* (i) : window for LPC analysis (L_WINDOW) */
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58 )
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59 {
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60 Word16 i, j, norm;
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61 Word16 y[L_WINDOW];
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62 Word32 sum;
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63 Word16 overfl, overfl_shft;
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64
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65 /* Windowing of signal */
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66
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67 for (i = 0; i < L_WINDOW; i++)
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68 {
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69 y[i] = mult_r (x[i], wind[i]); move16 ();
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70 }
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71
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72 /* Compute r[0] and test for overflow */
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73
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74 overfl_shft = 0; move16 ();
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75
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76 do
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77 {
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78 overfl = 0; move16 ();
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79 sum = 0L; move32 ();
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80
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81 for (i = 0; i < L_WINDOW; i++)
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82 {
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83 sum = L_mac (sum, y[i], y[i]);
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84 }
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85
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86 /* If overflow divide y[] by 4 */
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87
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88 test ();
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89 if (L_sub (sum, MAX_32) == 0L)
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90 {
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91 overfl_shft = add (overfl_shft, 4);
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92 overfl = 1; move16 (); /* Set the overflow flag */
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93
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94 for (i = 0; i < L_WINDOW; i++)
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95 {
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96 y[i] = shr (y[i], 2); move16 ();
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97 }
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98 }
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99 test ();
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100 }
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101 while (overfl != 0);
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102
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103 sum = L_add (sum, 1L); /* Avoid the case of all zeros */
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104
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105 /* Normalization of r[0] */
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106
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107 norm = norm_l (sum);
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108 sum = L_shl (sum, norm);
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109 L_Extract (sum, &r_h[0], &r_l[0]); /* Put in DPF format (see oper_32b) */
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110
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111 /* r[1] to r[m] */
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112
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113 for (i = 1; i <= m; i++)
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114 {
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115 sum = 0; move32 ();
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116
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117 for (j = 0; j < L_WINDOW - i; j++)
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118 {
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119 sum = L_mac (sum, y[j], y[j + i]);
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120 }
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121
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122 sum = L_shl (sum, norm);
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123 L_Extract (sum, &r_h[i], &r_l[i]);
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124 }
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125
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126 norm = sub (norm, overfl_shft);
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127
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128 return norm;
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129 }