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annotate libgsmefr/q_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 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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parents:
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125
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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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
03599300d2db libgsmefr: q_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
151 st->past_qua_en[i] = st->past_qua_en[i - 1];
53
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152 }
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Mychaela Falconia <falcon@freecalypso.org>
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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
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
155 st->past_qua_en[0] = shr (frac, 5);
03599300d2db libgsmefr: q_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
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
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
158 update_gain_code_history_tx (st, *gain);
53
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159 }
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diff changeset
160 else
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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161 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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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
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
164 st->gcode0_CN = update_gcode0_CN (st->gain_code_old_tx);
03599300d2db libgsmefr: q_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
165 st->gcode0_CN = shl (st->gcode0_CN, 4);
53
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166 }
88
03599300d2db libgsmefr: q_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
167 *gain = st->CN_excitation_gain;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
168
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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169 if ((txdtx_ctrl & TX_SID_UPDATE) != 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
170 {
88
03599300d2db libgsmefr: q_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
171 aver_gain = aver_gain_code_history (st->CN_excitation_gain,
03599300d2db libgsmefr: q_gains.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
172 st->gain_code_old_tx);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
173
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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174 /*---------------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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175 * Search for best quantizer *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
176 *---------------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
177
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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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
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
180 index = 0;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
181
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
182 for (i = 1; i < NB_QUA_CODE; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
183 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
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
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 if (sub (err, err_min) < 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 err_min = err; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 index = i; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 /*-------------------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
197 * reset table of past quantized energies *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
198 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 *-------------------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 for (i = 0; i < 4; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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>
parents:
diff changeset
208 }