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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 : b_cn_cod.c
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11 * Purpose : Contains function for comfort noise generation.
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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 "b_cn_cod.h"
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22
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23 /*
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24 ********************************************************************************
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25 * INCLUDE FILES
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26 ********************************************************************************
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27 */
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28 #include "typedef.h"
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29 #include "basic_op.h"
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30 #include "oper_32b.h"
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31 #include "no_count.h"
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32 #include "cnst.h"
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33 #include "window.h"
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34
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35 /*
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36 ********************************************************************************
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37 * LOCAL CONSTANTS
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38 ********************************************************************************
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39 */
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40 #define NB_PULSE 10 /* number of random pulses in DTX operation */
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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 * FUNCTION NAME: pseudonoise
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50 *
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51 *************************************************************************/
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52 Word16 pseudonoise (
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53 Word32 *shift_reg, /* i/o : Old CN generator shift register state */
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54 Word16 no_bits /* i : Number of bits */
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55 )
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56 {
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57 Word16 noise_bits, Sn, i;
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58
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59 noise_bits = 0; move16 ();
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60 for (i = 0; i < no_bits; i++)
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61 {
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62 /* State n == 31 */
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63 test (); logic32 ();
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64 if ((*shift_reg & 0x00000001L) != 0)
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65 {
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66 Sn = 1; move16 ();
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67 }
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68 else
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69 {
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70 Sn = 0; move16 ();
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71 }
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72
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73 /* State n == 3 */
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74 test (); logic32 ();
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75 if ((*shift_reg & 0x10000000L) != 0)
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76 {
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77 Sn = Sn ^ 1; move16 (); logic16 ();
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78 }
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79 else
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80 {
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81 Sn = Sn ^ 0; move16 (); logic16 ();
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82 }
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83
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84 noise_bits = shl (noise_bits, 1);
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85 noise_bits = noise_bits | (extract_l (*shift_reg) & 1);
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86 logic16 (); logic16 (); move16 ();
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87
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88 *shift_reg = L_shr (*shift_reg, 1);
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89 test ();
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90 if (Sn & 1)
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91 {
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92 *shift_reg = *shift_reg | 0x40000000L; move32 (); logic32 ();
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93 }
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94 }
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95 return noise_bits;
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96 }
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97
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98 /***************************************************************************
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99 *
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100 * Function : build_CN_code
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101 *
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102 ***************************************************************************/
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103 void build_CN_code (
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104 Word32 *seed, /* i/o : Old CN generator shift register state */
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105 Word16 cod[] /* o : Generated CN fixed codebook vector */
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106 )
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107 {
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108 Word16 i, j, k;
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109
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110 for (i = 0; i < L_SUBFR; i++)
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111 {
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112 cod[i] = 0; move16 ();
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113 }
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114
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115 for (k = 0; k < NB_PULSE; k++)
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116 {
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117 i = pseudonoise (seed, 2); /* generate pulse position */
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118 i = shr (extract_l (L_mult (i, 10)), 1);
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119 i = add (i, k);
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120
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121 j = pseudonoise (seed, 1); /* generate sign */
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122
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123 test ();
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124 if (j > 0)
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125 {
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126 cod[i] = 4096; move16 ();
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127 }
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128 else
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129 {
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130 cod[i] = -4096; move16 ();
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131 }
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132 }
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133
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134 return;
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135 }
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136
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137 /*************************************************************************
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138 *
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139 * FUNCTION NAME: build_CN_param
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140 *
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141 *************************************************************************/
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142 void build_CN_param (
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143 Word16 *seed, /* i/o : Old CN generator shift register state */
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144 const Word16 n_param, /* i : number of params */
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145 const Word16 param_size_table[],/* i : size of params */
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146 Word16 parm[] /* o : CN Generated params */
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147 )
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148 {
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149 Word16 i;
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150 const Word16 *p;
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151
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152 *seed = extract_l(L_add(L_shr(L_mult(*seed, 31821), 1), 13849L));
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153
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154 p = &window_200_40[*seed & 0x7F]; logic16();
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155 for(i=0; i< n_param;i++){
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156 move16 (); logic16(); logic16(); logic16();
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157 parm[i] = *p++ & ~(0xFFFF<<param_size_table[i]);
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158 }
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159 }