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annotate libgsmhr1/dtx_dec.c @ 598:5809165fb140

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libgsmhr1: integrate DTX functions for speech decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 09:51:11 +0000
parents
children c7c03231002d
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1 /***************************************************************************
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2 *
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3 * File Name: dtx_dec.c
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4 *
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5 * Derivation: this module is the subset of GSM 06.06 dtx.c
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6 * reduced to decoder functions that aren't in dtx_rxfe.c, i.e.,
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7 * apply only to the full decoder and not the TFO transform.
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8 *
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9 **************************************************************************/
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10
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11 /*________________________________________________________________________
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12 | |
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13 | Include Files |
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14 |________________________________________________________________________|
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15 */
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16
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17 #include <string.h>
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18 #include "typedefs.h"
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19 #include "namespace.h"
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20 #include "mathhalf.h"
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21 #include "mathdp31.h"
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22 #include "dec_func.h"
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23 #include "dec_state.h"
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24 #include "dtx_const.h"
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25 #include "dtx_dec.h"
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26
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27 /*________________________________________________________________________
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28 | |
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29 | Defines |
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30 |________________________________________________________________________|
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31 */
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32
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33 #define ASHIFT 4
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34 #define ASCALE 0x0800
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35
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36
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37 /*________________________________________________________________________
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38 | |
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39 | DTX Rom Tables |
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40 |________________________________________________________________________|
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41 */
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42
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43 /* interpolation curve for comfort noise (i*1/12) i=1..12 */
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44 static const Shortword psrCNNewFactor[12] = {
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45 0x0aaa, 0x1554, 0x1ffe, 0x2aa8, 0x3552,
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46 0x3ffc, 0x4aa6, 0x5550, 0x5ffa, 0x6aa4,
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47 0x754e, 0x7fff
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48 };
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49
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50
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51 /*
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52 * This function is a fragment from original rxInterpR0Lpc():
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53 * init or update CN interpolation endpoints on CNIFIRSTSID
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54 * or CNICONT.
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55 */
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56 void Init_CN_interpolation(struct gsmhr_decoder_state *st, Shortword deco_mode,
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57 Shortword new_R0, const Shortword *pswNewKs)
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58 {
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59 st->swR0OldCN = st->swOldR0Dec;
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60 st->swR0NewCN = new_R0;
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61 if (deco_mode == CNIFIRSTSID) {
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62 rcToCorrDpL(ASHIFT, ASCALE, st->pswOldFrmKsDec,
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63 st->pL_OldCorrSeq);
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64 } else {
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65 memcpy(st->pL_OldCorrSeq, st->pL_CorrSeq,
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66 sizeof(st->pL_CorrSeq));
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67 }
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68 rcToCorrDpL(ASHIFT, ASCALE, pswNewKs, st->pL_NewCorrSeq);
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69 }
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70
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71 /*
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72 * This function is a fragment from original rxInterpR0Lpc():
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73 * interpolate R0 for CN output.
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74 */
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75 Shortword CN_Interpolate_R0(struct gsmhr_decoder_state *st)
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76 {
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77 return linInterpSidShort(st->swR0NewCN, st->swR0OldCN,
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78 st->swRxDTXState);
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79 }
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80
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81 /*
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82 * This function is a fragment from original rxInterpR0Lpc():
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83 * interpolate LPC for CN output.
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84 */
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85 void CN_Interpolate_LPC(struct gsmhr_decoder_state *st, Shortword *pswNewKs)
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86 {
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87 int i;
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88
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89 /* linearly interpolate between the two sets of correlation coefs */
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90 /* -------------------------------------------------------------- */
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91
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92 for (i = 0; i < NP + 1; i++)
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93 {
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94 st->pL_CorrSeq[i] = linInterpSid(st->pL_NewCorrSeq[i],
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95 st->pL_OldCorrSeq[i],
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96 st->swRxDTXState);
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97 }
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98
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99 /* Generate this frames K's (overwrite input) */
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100 /* ------------------------------------------ */
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101
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102 aFlatRcDp(st->pL_CorrSeq, pswNewKs);
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103 }
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104
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105
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106 /*************************************************************************
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107 *
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108 * FUNCTION NAME: linInterpSid
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109 *
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110 * PURPOSE:
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111 *
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112 * Linearly interpolate between two input numbers based on what the
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113 * current DtxState is.
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114 *
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115 * INPUTS:
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116 *
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117 * L_New - longword more current value
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118 *
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119 * L_Old - longword oldest value
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120 *
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121 * swDtxState - state is 0 at the transmitted SID Frame.
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122 *
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123 *
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124 * OUTPUTS:
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125 *
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126 * none
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127 *
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128 * RETURN VALUE:
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129 *
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130 * A value between old and new inputs with dtxState+1/12 of the new
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131 * (dtxState+1)-12/12 of the old
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132 *
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133 *
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134 *************************************************************************/
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135
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136 Longword linInterpSid(Longword L_New, Longword L_Old, Shortword swDtxState)
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137 {
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138
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139 /*_________________________________________________________________________
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140 | |
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141 | Automatic Variables |
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142 |_________________________________________________________________________|
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143 */
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144
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145 Shortword swOldFactor;
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146
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147
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148 /*_________________________________________________________________________
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149 | |
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150 | Executable Code |
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151 |_________________________________________________________________________|
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152 */
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153
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154 /* old factor = (1.0 - newFactor) */
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155 /* ------------------------------ */
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156
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157 swOldFactor = sub(0x7fff, psrCNNewFactor[swDtxState]);
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158 swOldFactor = add(0x1, swOldFactor);
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159
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160
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161 /* contributions from new and old */
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162 /* ------------------------------ */
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163
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164 L_New = L_mpy_ls(L_New, psrCNNewFactor[swDtxState]);
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165 L_Old = L_mpy_ls(L_Old, swOldFactor);
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166
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167 return (L_add(L_New, L_Old));
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168
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169 }
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170
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171
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172 /*************************************************************************
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173 *
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174 * FUNCTION NAME: linInterpSidShort
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175 *
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176 * PURPOSE:
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177 *
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178 * Linearly interpolate between two input numbers based on what
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179 * the current DtxState is.
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180 *
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181 * INPUTS:
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182 *
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183 * swNew - 16 bit, more current value
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184 *
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185 * swOld - 16 bit, oldest value
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186 *
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187 * swDtxState - state is 0 at the transmitted SID Frame.
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188 *
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189 *
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190 * OUTPUTS:
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191 *
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192 * none
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193 *
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194 * RETURN VALUE:
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195 *
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196 * A value between old and new inputs with dtxState+1/12 of the new
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197 * (dtxState+1)-12/12 of the old
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198 *
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199 *************************************************************************/
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200
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201 Shortword linInterpSidShort(Shortword swNew, Shortword swOld,
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202 Shortword swDtxState)
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203 {
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204
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205 /*_________________________________________________________________________
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206 | |
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207 | Automatic Variables |
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208 |_________________________________________________________________________|
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209 */
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210
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211 Shortword swOldFactor;
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212 Longword L_New,
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213 L_Old;
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214
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215
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216 /*_________________________________________________________________________
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217 | |
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218 | Executable Code |
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219 |_________________________________________________________________________|
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220 */
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221
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222 /* old factor = (1.0 - newFactor) */
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223 /* ------------------------------ */
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224
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225 swOldFactor = sub(0x7fff, psrCNNewFactor[swDtxState]);
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226 swOldFactor = add(0x1, swOldFactor);
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227
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228
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229 /* contributions from new and old */
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230 /* ------------------------------ */
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231
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232 L_New = L_mult(swNew, psrCNNewFactor[swDtxState]);
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233 L_Old = L_mult(swOld, swOldFactor);
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234
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235
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236 return (round(L_add(L_New, L_Old)));
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237
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238 }