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annotate libtwamr/pred_lt.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 df14b0c17e6d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
398
df14b0c17e6d libtwamr: integrate pred_lt.c
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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 : pred_lt.c
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11 * Purpose : Compute the result of long term prediction
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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 ********************************************************************************
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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 "pred_lt.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "no_count.h"
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32 #include "cnst.h"
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33
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34 /*
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35 ********************************************************************************
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36 * LOCAL VARIABLES AND TABLES
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37 ********************************************************************************
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38 */
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39 #define UP_SAMP_MAX 6
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40 #define L_INTER10 (L_INTERPOL-1)
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41 #define FIR_SIZE (UP_SAMP_MAX*L_INTER10+1)
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42
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43 /* 1/6 resolution interpolation filter (-3 dB at 3600 Hz) */
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44 /* Note: the 1/3 resolution filter is simply a subsampled
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45 * version of the 1/6 resolution filter, i.e. it uses
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46 * every second coefficient:
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47 *
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48 * inter_3l[k] = inter_6[2*k], 0 <= k <= 3*L_INTER10
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49 */
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50 static const Word16 inter_6[FIR_SIZE] =
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51 {
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52 29443,
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53 28346, 25207, 20449, 14701, 8693, 3143,
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54 -1352, -4402, -5865, -5850, -4673, -2783,
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55 -672, 1211, 2536, 3130, 2991, 2259,
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56 1170, 0, -1001, -1652, -1868, -1666,
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57 -1147, -464, 218, 756, 1060, 1099,
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58 904, 550, 135, -245, -514, -634,
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59 -602, -451, -231, 0, 191, 308,
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60 340, 296, 198, 78, -36, -120,
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61 -163, -165, -132, -79, -19, 34,
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62 73, 91, 89, 70, 38, 0
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63 };
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64
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65 /*
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66 ********************************************************************************
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67 * PUBLIC PROGRAM CODE
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68 ********************************************************************************
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69 */
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70 /*************************************************************************
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71 *
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72 * FUNCTION: Pred_lt_3or6()
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73 *
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74 * PURPOSE: Compute the result of long term prediction with fractional
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75 * interpolation of resolution 1/3 or 1/6. (Interpolated past
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76 * excitation).
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77 *
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78 * DESCRIPTION:
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79 * The past excitation signal at the given delay is interpolated at
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80 * the given fraction to build the adaptive codebook excitation.
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81 * On return exc[0..L_subfr-1] contains the interpolated signal
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82 * (adaptive codebook excitation).
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83 *
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84 *************************************************************************/
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85 void Pred_lt_3or6 (
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86 Word16 exc[], /* in/out: excitation buffer */
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87 Word16 T0, /* input : integer pitch lag */
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88 Word16 frac, /* input : fraction of lag */
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89 Word16 L_subfr, /* input : subframe size */
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90 Word16 flag3 /* input : if set, upsampling rate = 3 (6 otherwise) */
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91 )
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92 {
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93 Word16 i, j, k;
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94 Word16 *x0, *x1, *x2;
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95 const Word16 *c1, *c2;
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96 Word32 s;
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97
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98 x0 = &exc[-T0]; move16 ();
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99
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100 frac = negate (frac);
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101 test();
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102 if (flag3 != 0)
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103 {
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104 frac = shl (frac, 1); /* inter_3l[k] = inter_6[2*k] -> k' = 2*k */
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105 }
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106
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107 test ();
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108 if (frac < 0)
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109 {
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110 frac = add (frac, UP_SAMP_MAX);
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111 x0--;
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112 }
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113
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114 for (j = 0; j < L_subfr; j++)
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115 {
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116 x1 = x0++; move16 ();
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117 x2 = x0; move16 ();
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118 c1 = &inter_6[frac];
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119 c2 = &inter_6[sub (UP_SAMP_MAX, frac)];
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120
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121 s = 0; move32 ();
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122 for (i = 0, k = 0; i < L_INTER10; i++, k += UP_SAMP_MAX)
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123 {
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124 s = L_mac (s, x1[-i], c1[k]);
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125 s = L_mac (s, x2[i], c2[k]);
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126 }
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127
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128 exc[j] = round (s); move16 ();
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129 }
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130
df14b0c17e6d libtwamr: integrate pred_lt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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131 return;
df14b0c17e6d libtwamr: integrate pred_lt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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132 }