FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/q_gains.c @ 183:452c1d5a6268
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> |
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date | Tue, 03 Jan 2023 00:12:18 +0000 |
parents | 03599300d2db |
children | 33487966077e |
rev | line source |
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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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18 |
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19 #include "gains_tb.h" |
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20 |
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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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24 |
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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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30 |
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31 gain_q14 = shl (*gain, 2); |
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32 |
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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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35 |
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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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39 |
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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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47 |
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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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52 |
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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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55 |
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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 { |
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151 st->past_qua_en[i] = st->past_qua_en[i - 1]; |
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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
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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)); |
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157 |
88
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158 update_gain_code_history_tx (st, *gain); |
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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
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164 st->gcode0_CN = update_gcode0_CN (st->gain_code_old_tx); |
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165 st->gcode0_CN = shl (st->gcode0_CN, 4); |
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166 } |
88
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167 *gain = st->CN_excitation_gain; |
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168 |
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169 if ((txdtx_ctrl & TX_SID_UPDATE) != 0) |
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170 { |
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171 aver_gain = aver_gain_code_history (st->CN_excitation_gain, |
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172 st->gain_code_old_tx); |
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173 |
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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, |
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179 mult (st->gcode0_CN, qua_gain_code[0]))); |
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180 index = 0; |
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181 |
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182 for (i = 1; i < NB_QUA_CODE; i++) |
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183 { |
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184 err = abs_s (sub (aver_gain, |
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185 mult (st->gcode0_CN, qua_gain_code[i]))); |
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186 |
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187 if (sub (err, err_min) < 0) |
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188 { |
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189 err_min = err; move16 (); |
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190 index = i; move16 (); |
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191 } |
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192 } |
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193 } |
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194 update_gain_code_history_tx (st, *gain); |
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195 |
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196 /*-------------------------------------------------------------------* |
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197 * reset table of past quantized energies * |
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198 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * |
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199 *-------------------------------------------------------------------*/ |
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200 |
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201 for (i = 0; i < 4; i++) |
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202 { |
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203 st->past_qua_en[i] = -2381; |
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204 } |
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205 } |
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206 |
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207 return index; |
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208 } |