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annotate libtwamr/b_cn_cod.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents 07f936338de1
children
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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 }