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annotate libgsmhr1/dtx_dec.c @ 601:c7c03231002d

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libgsmhr1: integrate main body of speech decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 12:49:19 +0000
parents 5809165fb140
children
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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,
601
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57 const Shortword *pswNewKs)
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58 {
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59 st->swR0OldCN = st->swOldR0Dec;
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60 if (deco_mode == CNIFIRSTSID) {
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61 rcToCorrDpL(ASHIFT, ASCALE, st->pswOldFrmKsDec,
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62 st->pL_OldCorrSeq);
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63 } else {
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64 memcpy(st->pL_OldCorrSeq, st->pL_CorrSeq,
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65 sizeof(st->pL_CorrSeq));
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66 }
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67 rcToCorrDpL(ASHIFT, ASCALE, pswNewKs, st->pL_NewCorrSeq);
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68 }
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69
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70 /*
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71 * This function is a fragment from original rxInterpR0Lpc():
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72 * interpolate R0 for CN output.
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73 */
601
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74 Shortword CN_Interpolate_R0(struct gsmhr_decoder_state *st, Shortword new_R0)
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75 {
601
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76 return linInterpSidShort(new_R0, st->swR0OldCN, st->swRxDTXState);
598
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77 }
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78
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79 /*
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80 * This function is a fragment from original rxInterpR0Lpc():
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81 * interpolate LPC for CN output.
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82 */
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83 void CN_Interpolate_LPC(struct gsmhr_decoder_state *st, Shortword *pswNewKs)
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84 {
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85 int i;
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86
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87 /* linearly interpolate between the two sets of correlation coefs */
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88 /* -------------------------------------------------------------- */
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89
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90 for (i = 0; i < NP + 1; i++)
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91 {
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92 st->pL_CorrSeq[i] = linInterpSid(st->pL_NewCorrSeq[i],
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93 st->pL_OldCorrSeq[i],
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94 st->swRxDTXState);
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95 }
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96
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97 /* Generate this frames K's (overwrite input) */
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98 /* ------------------------------------------ */
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99
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100 aFlatRcDp(st->pL_CorrSeq, pswNewKs);
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101 }
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102
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103
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104 /*************************************************************************
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105 *
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106 * FUNCTION NAME: linInterpSid
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107 *
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108 * PURPOSE:
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109 *
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110 * Linearly interpolate between two input numbers based on what the
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111 * current DtxState is.
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112 *
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113 * INPUTS:
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114 *
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115 * L_New - longword more current value
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116 *
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117 * L_Old - longword oldest value
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118 *
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119 * swDtxState - state is 0 at the transmitted SID Frame.
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120 *
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121 *
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122 * OUTPUTS:
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123 *
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124 * none
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125 *
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126 * RETURN VALUE:
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127 *
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128 * A value between old and new inputs with dtxState+1/12 of the new
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129 * (dtxState+1)-12/12 of the old
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130 *
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131 *
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132 *************************************************************************/
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133
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134 Longword linInterpSid(Longword L_New, Longword L_Old, Shortword swDtxState)
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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 | Automatic Variables |
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140 |_________________________________________________________________________|
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141 */
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142
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143 Shortword swOldFactor;
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144
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145
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146 /*_________________________________________________________________________
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147 | |
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148 | Executable Code |
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149 |_________________________________________________________________________|
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150 */
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151
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152 /* old factor = (1.0 - newFactor) */
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153 /* ------------------------------ */
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154
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155 swOldFactor = sub(0x7fff, psrCNNewFactor[swDtxState]);
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156 swOldFactor = add(0x1, swOldFactor);
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157
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158
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159 /* contributions from new and old */
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160 /* ------------------------------ */
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161
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162 L_New = L_mpy_ls(L_New, psrCNNewFactor[swDtxState]);
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163 L_Old = L_mpy_ls(L_Old, swOldFactor);
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164
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165 return (L_add(L_New, L_Old));
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166
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167 }
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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 * FUNCTION NAME: linInterpSidShort
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173 *
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174 * PURPOSE:
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175 *
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176 * Linearly interpolate between two input numbers based on what
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177 * the current DtxState is.
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178 *
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179 * INPUTS:
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180 *
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181 * swNew - 16 bit, more current value
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182 *
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183 * swOld - 16 bit, oldest value
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184 *
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185 * swDtxState - state is 0 at the transmitted SID Frame.
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186 *
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187 *
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188 * OUTPUTS:
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189 *
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190 * none
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191 *
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192 * RETURN VALUE:
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193 *
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194 * A value between old and new inputs with dtxState+1/12 of the new
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195 * (dtxState+1)-12/12 of the old
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196 *
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197 *************************************************************************/
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198
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199 Shortword linInterpSidShort(Shortword swNew, Shortword swOld,
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200 Shortword swDtxState)
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201 {
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202
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203 /*_________________________________________________________________________
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204 | |
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205 | Automatic Variables |
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206 |_________________________________________________________________________|
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207 */
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208
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209 Shortword swOldFactor;
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210 Longword L_New,
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211 L_Old;
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212
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213
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214 /*_________________________________________________________________________
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215 | |
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216 | Executable Code |
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217 |_________________________________________________________________________|
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218 */
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219
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220 /* old factor = (1.0 - newFactor) */
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221 /* ------------------------------ */
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222
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223 swOldFactor = sub(0x7fff, psrCNNewFactor[swDtxState]);
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224 swOldFactor = add(0x1, swOldFactor);
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225
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226
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227 /* contributions from new and old */
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228 /* ------------------------------ */
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229
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230 L_New = L_mult(swNew, psrCNNewFactor[swDtxState]);
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231 L_Old = L_mult(swOld, swOldFactor);
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232
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233
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234 return (round(L_add(L_New, L_Old)));
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235
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236 }