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annotate libgsmefr/d_gains.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +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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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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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 {
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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 {
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142 st->pbuf[i - 1] = st->pbuf[i];
53
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143 }
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144
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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 {
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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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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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234
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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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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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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
253 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
254
61
a18782a7d270 libgsmefr: d_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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 }