FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/d_gains.c @ 169:0c965c3c5e6e

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doc/Utils-overview: new Calypso TCH DL utils
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 25 Dec 2022 09:53:04 +0000
parents a18782a7d270
children 9b07190a6d08
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1 /*************************************************************************
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2 *
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3 * FILE NAME: D_GAINS.C
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4 *
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5 * FUNCTIONS DEFINED IN THIS FILE:
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6 *
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7 * d_gain_pitch(), d_gain_code() and gmed5()
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8 *
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9 * MA prediction is performed on the innovation energy
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10 * ( in dB/(20*log10(2)) ) with mean removed.
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11 *************************************************************************/
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12
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13 #include "gsm_efr.h"
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14 #include "typedef.h"
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15 #include "namespace.h"
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16 #include "basic_op.h"
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17 #include "oper_32b.h"
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18 #include "no_count.h"
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19 #include "sig_proc.h"
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20 #include "memops.h"
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21 #include "codec.h"
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23 #include "gains_tb.h"
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24
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25 #include "cnst.h"
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26 #include "dec_state.h"
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27 #include "dtx.h"
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28
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29 /*************************************************************************
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30 *
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31 * FUNCTION: gmed5
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32 *
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33 * PURPOSE: calculates 5-point median.
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34 *
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35 * DESCRIPTION:
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36 *
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37 *************************************************************************/
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38
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39 static Word16 gmed5 ( /* out : index of the median value (0...4) */
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40 Word16 ind[] /* in : Past gain values */
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41 )
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42 {
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43 Word16 i, j, ix = 0, tmp[5];
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44 Word16 max, tmp2[5];
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46 Copy (ind, tmp2, 5);
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48 for (i = 0; i < 5; i++)
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49 {
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50 max = -8192; move16 ();
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51 for (j = 0; j < 5; j++)
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52 {
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53 if (tmp2[j] >= max)
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54 {
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55 max = tmp2[j]; move16 ();
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56 ix = j; move16 ();
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57 }
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58 }
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59 tmp2[ix] = -16384; move16 ();
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60 tmp[i] = ix; move16 ();
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61 }
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63 return (ind[tmp[2]]);
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64 }
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65
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66 /*************************************************************************
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67 *
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68 * FUNCTION: d_gain_pitch
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69 *
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70 * PURPOSE: decodes the pitch gain using the received index.
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71 *
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72 * DESCRIPTION:
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73 * In case of no frame erasure, the gain is obtained from the
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74 * quantization table at the given index; otherwise, a downscaled
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75 * past gain is used.
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76 *
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77 *************************************************************************/
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78
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79 Word16 d_gain_pitch ( /* out : quantized pitch gain */
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80 struct EFR_decoder_state *st,
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81 Word16 index, /* in : index of quantization */
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82 Word16 bfi, /* in : bad frame indicator (good = 0) */
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83 Word16 state,
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84 Word16 prev_bf,
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85 Word16 rxdtx_ctrl
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86 )
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87 {
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88 static const Word16 pdown[7] =
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89 {
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90 32767, 32112, 32112, 26214,
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91 9830, 6553, 6553
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92 };
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93
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94 Word16 gain, tmp, i;
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95
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96 if (bfi == 0)
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97 {
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98 if ((rxdtx_ctrl & RX_SP_FLAG) != 0)
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99 {
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100 gain = shr (qua_gain_pitch[index], 2);
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101
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102 if (prev_bf != 0)
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103 {
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104 if (gain > st->prev_gp)
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105 {
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106 gain = st->prev_gp;
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107 }
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108 }
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109 }
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110 else
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111 {
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112 gain = 0;
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113 }
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114 st->prev_gp = gain;
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115 }
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116 else
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117 {
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118 if ((rxdtx_ctrl & RX_SP_FLAG) != 0)
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119 {
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120 tmp = gmed5 (st->pbuf);
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121
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122 if (tmp < st->past_gain_pit)
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123 {
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124 st->past_gain_pit = tmp;
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125 }
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126 gain = mult (pdown[state], st->past_gain_pit);
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127 }
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128 else
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129 {
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130 gain = 0;
53
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131 }
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132 }
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133
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134 st->past_gain_pit = gain;
53
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135
61
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136 if (sub (st->past_gain_pit, 4096) > 0) /* if (past_gain_pit > 1.0) */
53
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137 {
61
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138 st->past_gain_pit = 4096;
53
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139 }
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140 for (i = 1; i < 5; i++)
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141 {
61
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142 st->pbuf[i - 1] = st->pbuf[i];
53
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143 }
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144
61
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145 st->pbuf[4] = st->past_gain_pit;
53
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146
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147 return gain;
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148 }
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149
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150 /*************************************************************************
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151 *
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152 * FUNCTION: d_gain_code
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153 *
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154 * PURPOSE: decode the fixed codebook gain using the received index.
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155 *
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156 * DESCRIPTION:
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157 * The received index gives the gain correction factor gamma.
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158 * The quantized gain is given by g_q = g0 * gamma
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159 * where g0 is the predicted gain.
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160 * To find g0, 4th order MA prediction is applied to the mean-removed
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161 * innovation energy in dB.
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162 * In case of frame erasure, downscaled past gain is used.
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163 *
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164 *************************************************************************/
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165
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166 /* average innovation energy. */
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167 /* MEAN_ENER = 36.0/constant, constant = 20*Log10(2) */
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168 #define MEAN_ENER 783741L /* 36/(20*log10(2)) */
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169
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170 void d_gain_code (
61
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171 struct EFR_decoder_state *st,
53
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172 Word16 index, /* input : received quantization index */
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173 Word16 code[], /* input : innovation codevector */
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174 Word16 lcode, /* input : codevector length */
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175 Word16 *gain_code, /* output: decoded innovation gain */
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176 Word16 bfi, /* input : bad frame indicator */
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177 Word16 state,
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178 Word16 prev_bf,
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179 Word16 rxdtx_ctrl,
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180 Word16 i_subfr,
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181 Word16 rx_dtx_state
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182 )
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183 {
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184 static const Word16 cdown[7] =
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185 {
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186 32767, 32112, 32112, 32112,
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187 32112, 32112, 22937
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188 };
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189
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190 Word16 i, tmp;
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191 Word16 gcode0, exp, frac, av_pred_en;
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192 Word32 ener, ener_code;
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193
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194 if (((rxdtx_ctrl & RX_UPD_SID_QUANT_MEM) != 0) && (i_subfr == 0))
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195 {
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196 st->gcode0_CN = update_gcode0_CN (st->gain_code_old_rx);
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197 st->gcode0_CN = shl (st->gcode0_CN, 4);
53
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198 }
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199
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200 /* Handle cases of comfort noise fixed codebook gain decoding in
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201 which past valid SID frames are repeated */
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202
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203 if (((rxdtx_ctrl & RX_NO_TRANSMISSION) != 0)
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204 || ((rxdtx_ctrl & RX_INVALID_SID_FRAME) != 0)
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205 || ((rxdtx_ctrl & RX_LOST_SID_FRAME) != 0))
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206 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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207
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208 if ((rxdtx_ctrl & RX_NO_TRANSMISSION) != 0)
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209 {
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210 /* DTX active: no transmission. Interpolate gain values
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211 in memory */
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212 if (i_subfr == 0)
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213 {
61
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diff changeset
214 *gain_code = interpolate_CN_param (st->gain_code_old_CN,
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diff changeset
215 st->gain_code_new_CN, rx_dtx_state);
53
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216 }
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217 else
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218 {
61
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219 *gain_code = st->prev_gc;
53
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220 }
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diff changeset
221 }
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222 else
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223 { /* Invalid or lost SID frame:
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224 use gain values from last good SID frame */
61
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diff changeset
225 st->gain_code_old_CN = st->gain_code_new_CN;
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226 *gain_code = st->gain_code_new_CN;
53
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227
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228 /* reset table of past quantized energies */
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229 for (i = 0; i < 4; i++)
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230 {
61
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diff changeset
231 st->past_qua_en[i] = -2381;
53
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232 }
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233 }
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diff changeset
234
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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235 if ((rxdtx_ctrl & RX_DTX_MUTING) != 0)
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236 {
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237 /* attenuate the gain value by 0.75 dB in each subframe */
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238 /* (total of 3 dB per frame) */
61
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diff changeset
239 st->gain_code_muting_CN = mult (st->gain_code_muting_CN, 30057);
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240 *gain_code = st->gain_code_muting_CN;
53
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diff changeset
241 }
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diff changeset
242 else
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243 {
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244 /* Prepare for DTX muting by storing last good gain value */
61
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diff changeset
245 st->gain_code_muting_CN = st->gain_code_new_CN;
53
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246 }
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247
61
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diff changeset
248 st->past_gain_code = *gain_code;
53
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249
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250 for (i = 1; i < 5; i++)
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diff changeset
251 {
61
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diff changeset
252 st->gbuf[i - 1] = st->gbuf[i];
53
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253 }
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254
61
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parents: 53
diff changeset
255 st->gbuf[4] = st->past_gain_code;
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
256 st->prev_gc = st->past_gain_code;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
257
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
258 return;
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
259 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
260
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
261 /*----------------- Test erasure ---------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
262
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
263 if (bfi != 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
264 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
265 tmp = gmed5 (st->gbuf);
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
266 if (sub (tmp, st->past_gain_code) < 0)
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
267 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
268 st->past_gain_code = tmp;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
269 }
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
270 st->past_gain_code = mult (st->past_gain_code, cdown[state]);
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
271 *gain_code = st->past_gain_code;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
272
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
273 av_pred_en = 0;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
274 for (i = 0; i < 4; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
275 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
276 av_pred_en = add (av_pred_en, st->past_qua_en[i]);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
277 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
278
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
279 /* av_pred_en = 0.25*av_pred_en - 4/(20Log10(2)) */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
280 av_pred_en = mult (av_pred_en, 8192); /* *= 0.25 */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
281
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
282 /* if (av_pred_en < -14/(20Log10(2))) av_pred_en = .. */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
283 if (sub (av_pred_en, -2381) < 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
284 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
285 av_pred_en = -2381;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
286 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
287 for (i = 3; i > 0; i--)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
288 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
289 st->past_qua_en[i] = st->past_qua_en[i - 1];
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
290 }
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
291 st->past_qua_en[0] = av_pred_en;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
292 for (i = 1; i < 5; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
293 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
294 st->gbuf[i - 1] = st->gbuf[i];
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
295 }
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
296 st->gbuf[4] = st->past_gain_code;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
297
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
298 /* Use the most recent comfort noise fixed codebook gain value
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
299 for updating the fixed codebook gain history */
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
300 if (st->gain_code_new_CN == 0)
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
301 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
302 tmp = st->prev_gc;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
303 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
304 else
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
305 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
306 tmp = st->gain_code_new_CN;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
307 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
308
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
309 update_gain_code_history_rx (st, tmp);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
310
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
311 if (sub (i_subfr, (3 * L_SUBFR)) == 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
312 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
313 st->gain_code_old_CN = *gain_code;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
314 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
315 return;
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
316 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
317
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
318 if ((rxdtx_ctrl & RX_SP_FLAG) != 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
319 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
320
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
321 /*-------------- Decode codebook gain ---------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
322
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
323 /*-------------------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
324 * energy of code: *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
325 * ~~~~~~~~~~~~~~~ *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
326 * ener_code = 10 * Log10(energy/lcode) / constant *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
327 * = 1/2 * Log2(energy/lcode) *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
328 * constant = 20*Log10(2) *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
329 *-------------------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
330
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
331 /* ener_code = log10(ener_code/lcode) / (20*log10(2)) */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
332 ener_code = 0; move32 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
333 for (i = 0; i < lcode; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
334 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
335 ener_code = L_mac (ener_code, code[i], code[i]);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
336 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
337 /* ener_code = ener_code / lcode */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
338 ener_code = L_mult (round (ener_code), 26214);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
339
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
340 /* ener_code = 1/2 * Log2(ener_code) */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
341 Log2 (ener_code, &exp, &frac);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
342 ener_code = L_Comp (sub (exp, 30), frac);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
343
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
344 /* predicted energy */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
345
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
346 ener = MEAN_ENER; move32 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
347 for (i = 0; i < 4; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
348 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
349 ener = L_mac (ener, st->past_qua_en[i], st->pred[i]);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
350 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
351
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
352 /*-------------------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
353 * predicted codebook gain *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
354 * ~~~~~~~~~~~~~~~~~~~~~~~ *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
355 * gcode0 = Pow10( (ener*constant - ener_code*constant) / 20 ) *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
356 * = Pow2(ener-ener_code) *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
357 * constant = 20*Log10(2) *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
358 *-------------------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
359
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
360 ener = L_shr (L_sub (ener, ener_code), 1);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
361 L_Extract (ener, &exp, &frac);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
362
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
363 gcode0 = extract_l (Pow2 (exp, frac)); /* predicted gain */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
364
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
365 gcode0 = shl (gcode0, 4);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
366
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
367 *gain_code = mult (qua_gain_code[index], gcode0); move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
368
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
369 if (prev_bf != 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
370 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
371 if (sub (*gain_code, st->prev_gc) > 0)
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
372 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
373 *gain_code = st->prev_gc;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
374 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
375 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
376 /*-------------------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
377 * update table of past quantized energies *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
378 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
379 * past_qua_en = 20 * Log10(qua_gain_code) / constant *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
380 * = Log2(qua_gain_code) *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
381 * constant = 20*Log10(2) *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
382 *-------------------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
383
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
384 for (i = 3; i > 0; i--)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
385 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
386 st->past_qua_en[i] = st->past_qua_en[i - 1];
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
387 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
388 Log2 (L_deposit_l (qua_gain_code[index]), &exp, &frac);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
389
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
390 st->past_qua_en[0] = shr (frac, 5);
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
391 st->past_qua_en[0] = add (st->past_qua_en[0], shl (sub (exp, 11), 10));
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
392
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
393 update_gain_code_history_rx (st, *gain_code);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
394
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
395 if (sub (i_subfr, (3 * L_SUBFR)) == 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
396 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
397 st->gain_code_old_CN = *gain_code;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
398 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
399 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
400 else
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
401 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
402 if (((rxdtx_ctrl & RX_FIRST_SID_UPDATE) != 0) && (i_subfr == 0))
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
403 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
404 st->gain_code_new_CN = mult (st->gcode0_CN, qua_gain_code[index]);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
405
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
406 /*---------------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
407 * reset table of past quantized energies *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
408 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
409 *---------------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
410
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
411 for (i = 0; i < 4; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
412 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
413 st->past_qua_en[i] = -2381;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
414 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
415 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
416 if (((rxdtx_ctrl & RX_CONT_SID_UPDATE) != 0) && (i_subfr == 0))
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
417 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
418 st->gain_code_old_CN = st->gain_code_new_CN;
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
419 st->gain_code_new_CN = mult (st->gcode0_CN, qua_gain_code[index]);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
420 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
421 if (i_subfr == 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
422 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
423 *gain_code = interpolate_CN_param (st->gain_code_old_CN,
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
424 st->gain_code_new_CN,
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
425 rx_dtx_state);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
426 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
427 else
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
428 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
429 *gain_code = st->prev_gc;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
430 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
431 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
432
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
433 st->past_gain_code = *gain_code;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
434
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
435 for (i = 1; i < 5; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
436 {
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
437 st->gbuf[i - 1] = st->gbuf[i];
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
438 }
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
439 st->gbuf[4] = st->past_gain_code;
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
440 st->prev_gc = st->past_gain_code;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
441
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
442 return;
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
443 }