FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/q_gains.c @ 53:49dd1ac8e75b

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libgsmefr: import most *.c files from ETSI source
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 25 Nov 2022 16:18:21 +0000
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children 03599300d2db
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1 /*--------------------------------------------------------------------------*
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2 * Function q_gain_pitch(), q_gain_code() *
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3 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
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4 * Scalar quantization of the pitch gain and the innovative codebook gain. *
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5 * *
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6 * MA prediction is performed on the innovation energy *
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7 * (in dB/(20*log10(2))) with mean removed. *
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8 *-------------------------------------------------------------------------*/
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9
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10 #include "typedef.h"
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11 #include "basic_op.h"
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12 #include "oper_32b.h"
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13 #include "count.h"
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14 #include "sig_proc.h"
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15
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16 #include "gains_tb.h"
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17
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18 #include "cnst.h"
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19 #include "dtx.h"
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20
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21 /* past quantized energies. */
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22 /* initialized to -14.0/constant, constant = 20*Log10(2) */
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23 Word16 past_qua_en[4];
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24
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25 /* MA prediction coeff */
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26 Word16 pred[4];
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27
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28 extern Word16 CN_excitation_gain, gain_code_old_tx[4 * DTX_HANGOVER];
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29
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30 Word16 q_gain_pitch ( /* Return index of quantization */
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31 Word16 *gain /* (i) : Pitch gain to quantize */
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32 )
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33 {
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34 Word16 i, index, gain_q14, err, err_min;
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35
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36 gain_q14 = shl (*gain, 2);
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37
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38 err_min = abs_s (sub (gain_q14, qua_gain_pitch[0]));
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39 index = 0; move16 ();
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40
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41 for (i = 1; i < NB_QUA_PITCH; i++)
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42 {
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43 err = abs_s (sub (gain_q14, qua_gain_pitch[i]));
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44
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45 test ();
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46 if (sub (err, err_min) < 0)
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47 {
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48 err_min = err; move16 ();
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49 index = i; move16 ();
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50 }
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51 }
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52
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53 *gain = shr (qua_gain_pitch[index], 2); move16 ();
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54
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55 return index;
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56 }
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57
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58 /* average innovation energy. */
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59 /* MEAN_ENER = 36.0/constant, constant = 20*Log10(2) */
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60
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61 #define MEAN_ENER 783741L /* 36/(20*log10(2)) */
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62
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63 Word16 q_gain_code ( /* Return quantization index */
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64 Word16 code[], /* (i) : fixed codebook excitation */
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65 Word16 lcode, /* (i) : codevector size */
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66 Word16 *gain, /* (i/o) : quantized fixed codebook gain */
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67 Word16 txdtx_ctrl,
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68 Word16 i_subfr
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69 )
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70 {
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71 Word16 i, index;
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72 Word16 gcode0, err, err_min, exp, frac;
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73 Word32 ener, ener_code;
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74 Word16 aver_gain;
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75 static Word16 gcode0_CN;
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76
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77 logic16 (); test ();
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78 if ((txdtx_ctrl & TX_SP_FLAG) != 0)
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79 {
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80
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81 /*-------------------------------------------------------------------*
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82 * energy of code: *
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83 * ~~~~~~~~~~~~~~~ *
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84 * ener_code(Q17) = 10 * Log10(energy/lcode) / constant *
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85 * = 1/2 * Log2(energy/lcode) *
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86 * constant = 20*Log10(2) *
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87 *-------------------------------------------------------------------*/
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88
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89 /* ener_code = log10(ener_code/lcode) / (20*log10(2)) */
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90 ener_code = 0; move32 ();
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91 for (i = 0; i < lcode; i++)
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92 {
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93 ener_code = L_mac (ener_code, code[i], code[i]);
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94 }
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95 /* ener_code = ener_code / lcode */
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96 ener_code = L_mult (round (ener_code), 26214);
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97
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98 /* ener_code = 1/2 * Log2(ener_code) */
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99 Log2 (ener_code, &exp, &frac);
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100 ener_code = L_Comp (sub (exp, 30), frac);
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101
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102 /* predicted energy */
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103
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104 ener = MEAN_ENER; move32 ();
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105 for (i = 0; i < 4; i++)
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106 {
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107 ener = L_mac (ener, past_qua_en[i], pred[i]);
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108 }
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109
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110 /*-------------------------------------------------------------------*
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111 * predicted codebook gain *
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112 * ~~~~~~~~~~~~~~~~~~~~~~~ *
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113 * gcode0(Qx) = Pow10( (ener*constant - ener_code*constant) / 20 ) *
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114 * = Pow2(ener-ener_code) *
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115 * constant = 20*Log10(2) *
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116 *-------------------------------------------------------------------*/
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117
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118 ener = L_shr (L_sub (ener, ener_code), 1);
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119 L_Extract (ener, &exp, &frac);
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120
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121 gcode0 = extract_l (Pow2 (exp, frac)); /* predicted gain */
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122
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123 gcode0 = shl (gcode0, 4);
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124
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125 /*-------------------------------------------------------------------*
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126 * Search for best quantizer *
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127 *-------------------------------------------------------------------*/
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128
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129 err_min = abs_s (sub (*gain, mult (gcode0, qua_gain_code[0])));
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130 index = 0; move16 ();
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131
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132 for (i = 1; i < NB_QUA_CODE; i++)
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133 {
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134 err = abs_s (sub (*gain, mult (gcode0, qua_gain_code[i])));
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135
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136 test ();
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137 if (sub (err, err_min) < 0)
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138 {
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139 err_min = err; move16 ();
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140 index = i; move16 ();
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141 }
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142 }
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143
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144 *gain = mult (gcode0, qua_gain_code[index]);
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145 move16 ();
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146
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147 /*------------------------------------------------------------------*
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148 * update table of past quantized energies *
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149 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
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150 * past_qua_en(Q12) = 20 * Log10(qua_gain_code) / constant *
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151 * = Log2(qua_gain_code) *
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152 * constant = 20*Log10(2) *
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153 *------------------------------------------------------------------*/
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154
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155 for (i = 3; i > 0; i--)
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156 {
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157 past_qua_en[i] = past_qua_en[i - 1];move16 ();
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158 }
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159 Log2 (L_deposit_l (qua_gain_code[index]), &exp, &frac);
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160
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161 past_qua_en[0] = shr (frac, 5); move16 ();
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162 past_qua_en[0] = add (past_qua_en[0], shl (sub (exp, 11), 10));
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163 move16 ();
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164
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165 update_gain_code_history_tx (*gain, gain_code_old_tx);
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166 }
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167 else
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168 {
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169 logic16 (); test (); test ();
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170 if ((txdtx_ctrl & TX_PREV_HANGOVER_ACTIVE) != 0 && (i_subfr == 0))
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171 {
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172 gcode0_CN = update_gcode0_CN (gain_code_old_tx);
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173 gcode0_CN = shl (gcode0_CN, 4);
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174 }
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175 *gain = CN_excitation_gain; move16 ();
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176
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177 logic16 (); test (); test ();
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178 if ((txdtx_ctrl & TX_SID_UPDATE) != 0)
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179 {
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180 aver_gain = aver_gain_code_history (CN_excitation_gain,
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181 gain_code_old_tx);
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182
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183 /*---------------------------------------------------------------*
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184 * Search for best quantizer *
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185 *---------------------------------------------------------------*/
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186
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187 err_min = abs_s (sub (aver_gain,
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188 mult (gcode0_CN, qua_gain_code[0])));
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189 index = 0; move16 ();
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190
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191 for (i = 1; i < NB_QUA_CODE; i++)
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192 {
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193 err = abs_s (sub (aver_gain,
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194 mult (gcode0_CN, qua_gain_code[i])));
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195
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196 test ();
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197 if (sub (err, err_min) < 0)
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198 {
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199 err_min = err; move16 ();
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200 index = i; move16 ();
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201 }
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202 }
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203 }
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204 update_gain_code_history_tx (*gain, gain_code_old_tx);
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205
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206 /*-------------------------------------------------------------------*
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207 * reset table of past quantized energies *
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208 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
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209 *-------------------------------------------------------------------*/
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210
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211 for (i = 0; i < 4; i++)
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212 {
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213 past_qua_en[i] = -2381; move16 ();
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214 }
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215 }
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216
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217 return index;
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218 }