FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/q_gains.c @ 85:db8e0b69a6bb
libgsmefr: pred_lt6.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 08:59:34 +0000 |
parents | 49dd1ac8e75b |
children | 03599300d2db |
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 "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 } |