FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/q_gains.c @ 181:3a0ee08a3b9d

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doc/EFR-rationale: typo fix
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 02 Jan 2023 20:09:07 +0000
parents 03599300d2db
children 33487966077e
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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 "gsm_efr.h"
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11 #include "typedef.h"
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12 #include "namespace.h"
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13 #include "basic_op.h"
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14 #include "oper_32b.h"
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15 #include "no_count.h"
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16 #include "sig_proc.h"
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17 #include "codec.h"
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19 #include "gains_tb.h"
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21 #include "cnst.h"
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22 #include "dtx.h"
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23 #include "enc_state.h"
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25 Word16 q_gain_pitch ( /* Return index of quantization */
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26 Word16 *gain /* (i) : Pitch gain to quantize */
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27 )
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28 {
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29 Word16 i, index, gain_q14, err, err_min;
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31 gain_q14 = shl (*gain, 2);
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33 err_min = abs_s (sub (gain_q14, qua_gain_pitch[0]));
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34 index = 0; move16 ();
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36 for (i = 1; i < NB_QUA_PITCH; i++)
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37 {
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38 err = abs_s (sub (gain_q14, qua_gain_pitch[i]));
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40 test ();
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41 if (sub (err, err_min) < 0)
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42 {
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43 err_min = err; move16 ();
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44 index = i; move16 ();
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45 }
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46 }
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48 *gain = shr (qua_gain_pitch[index], 2); move16 ();
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49
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50 return index;
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51 }
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53 /* average innovation energy. */
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54 /* MEAN_ENER = 36.0/constant, constant = 20*Log10(2) */
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56 #define MEAN_ENER 783741L /* 36/(20*log10(2)) */
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57
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58 Word16 q_gain_code ( /* Return quantization index */
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59 struct EFR_encoder_state *st,
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60 Word16 code[], /* (i) : fixed codebook excitation */
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61 Word16 lcode, /* (i) : codevector size */
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62 Word16 *gain, /* (i/o) : quantized fixed codebook gain */
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63 Word16 txdtx_ctrl,
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64 Word16 i_subfr
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65 )
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66 {
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67 Word16 i, index;
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68 Word16 gcode0, err, err_min, exp, frac;
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69 Word32 ener, ener_code;
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70 Word16 aver_gain;
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71
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72 if ((txdtx_ctrl & TX_SP_FLAG) != 0)
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73 {
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74
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75 /*-------------------------------------------------------------------*
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76 * energy of code: *
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77 * ~~~~~~~~~~~~~~~ *
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78 * ener_code(Q17) = 10 * Log10(energy/lcode) / constant *
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79 * = 1/2 * Log2(energy/lcode) *
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80 * constant = 20*Log10(2) *
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81 *-------------------------------------------------------------------*/
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82
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83 /* ener_code = log10(ener_code/lcode) / (20*log10(2)) */
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84 ener_code = 0; move32 ();
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85 for (i = 0; i < lcode; i++)
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86 {
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87 ener_code = L_mac (ener_code, code[i], code[i]);
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88 }
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89 /* ener_code = ener_code / lcode */
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90 ener_code = L_mult (round (ener_code), 26214);
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91
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92 /* ener_code = 1/2 * Log2(ener_code) */
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93 Log2 (ener_code, &exp, &frac);
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94 ener_code = L_Comp (sub (exp, 30), frac);
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95
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96 /* predicted energy */
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97
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98 ener = MEAN_ENER; move32 ();
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99 for (i = 0; i < 4; i++)
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100 {
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101 ener = L_mac (ener, st->past_qua_en[i], st->pred[i]);
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102 }
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103
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104 /*-------------------------------------------------------------------*
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105 * predicted codebook gain *
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106 * ~~~~~~~~~~~~~~~~~~~~~~~ *
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107 * gcode0(Qx) = Pow10( (ener*constant - ener_code*constant) / 20 ) *
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108 * = Pow2(ener-ener_code) *
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109 * constant = 20*Log10(2) *
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110 *-------------------------------------------------------------------*/
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111
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112 ener = L_shr (L_sub (ener, ener_code), 1);
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113 L_Extract (ener, &exp, &frac);
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114
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115 gcode0 = extract_l (Pow2 (exp, frac)); /* predicted gain */
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116
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117 gcode0 = shl (gcode0, 4);
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118
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119 /*-------------------------------------------------------------------*
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120 * Search for best quantizer *
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121 *-------------------------------------------------------------------*/
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122
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123 err_min = abs_s (sub (*gain, mult (gcode0, qua_gain_code[0])));
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124 index = 0; move16 ();
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125
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126 for (i = 1; i < NB_QUA_CODE; i++)
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127 {
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128 err = abs_s (sub (*gain, mult (gcode0, qua_gain_code[i])));
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129
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130 test ();
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131 if (sub (err, err_min) < 0)
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132 {
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133 err_min = err; move16 ();
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134 index = i; move16 ();
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135 }
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136 }
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137
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138 *gain = mult (gcode0, qua_gain_code[index]);
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139 move16 ();
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140
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141 /*------------------------------------------------------------------*
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142 * update table of past quantized energies *
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143 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
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144 * past_qua_en(Q12) = 20 * Log10(qua_gain_code) / constant *
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145 * = Log2(qua_gain_code) *
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146 * constant = 20*Log10(2) *
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147 *------------------------------------------------------------------*/
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148
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149 for (i = 3; i > 0; i--)
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150 {
88
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151 st->past_qua_en[i] = st->past_qua_en[i - 1];
53
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152 }
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153 Log2 (L_deposit_l (qua_gain_code[index]), &exp, &frac);
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154
88
03599300d2db libgsmefr: q_gains.c compiles
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155 st->past_qua_en[0] = shr (frac, 5);
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156 st->past_qua_en[0] = add (st->past_qua_en[0], shl (sub (exp, 11), 10));
53
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157
88
03599300d2db libgsmefr: q_gains.c compiles
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158 update_gain_code_history_tx (st, *gain);
53
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159 }
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160 else
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161 {
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162 if ((txdtx_ctrl & TX_PREV_HANGOVER_ACTIVE) != 0 && (i_subfr == 0))
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163 {
88
03599300d2db libgsmefr: q_gains.c compiles
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164 st->gcode0_CN = update_gcode0_CN (st->gain_code_old_tx);
03599300d2db libgsmefr: q_gains.c compiles
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165 st->gcode0_CN = shl (st->gcode0_CN, 4);
53
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166 }
88
03599300d2db libgsmefr: q_gains.c compiles
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167 *gain = st->CN_excitation_gain;
53
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168
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169 if ((txdtx_ctrl & TX_SID_UPDATE) != 0)
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170 {
88
03599300d2db libgsmefr: q_gains.c compiles
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diff changeset
171 aver_gain = aver_gain_code_history (st->CN_excitation_gain,
03599300d2db libgsmefr: q_gains.c compiles
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parents: 53
diff changeset
172 st->gain_code_old_tx);
53
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173
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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174 /*---------------------------------------------------------------*
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175 * Search for best quantizer *
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176 *---------------------------------------------------------------*/
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177
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178 err_min = abs_s (sub (aver_gain,
88
03599300d2db libgsmefr: q_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
179 mult (st->gcode0_CN, qua_gain_code[0])));
03599300d2db libgsmefr: q_gains.c compiles
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diff changeset
180 index = 0;
53
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181
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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182 for (i = 1; i < NB_QUA_CODE; i++)
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183 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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184 err = abs_s (sub (aver_gain,
88
03599300d2db libgsmefr: q_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
185 mult (st->gcode0_CN, qua_gain_code[i])));
53
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diff changeset
186
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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187 if (sub (err, err_min) < 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
188 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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189 err_min = err; move16 ();
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190 index = i; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
191 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
192 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
193 }
88
03599300d2db libgsmefr: q_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
194 update_gain_code_history_tx (st, *gain);
53
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diff changeset
195
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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196 /*-------------------------------------------------------------------*
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197 * reset table of past quantized energies *
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diff changeset
198 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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199 *-------------------------------------------------------------------*/
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
200
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
201 for (i = 0; i < 4; i++)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 {
88
03599300d2db libgsmefr: q_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
203 st->past_qua_en[i] = -2381;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
204 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
205 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 return index;
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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208 }