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annotate libtwamr/dec_gain.c @ 458:e26b974f7ba3

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doc/AMR-study-utils: update for the current situation
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 10 May 2024 18:45:36 +0000
parents 5ccfe176bae1
children
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : dec_gain.c
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11 * Purpose : Decode the pitch and codebook gains
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12 *
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13 ********************************************************************************
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14 */
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15
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16 /*
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17 ********************************************************************************
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18 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "dec_gain.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include <stddef.h>
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30 #include "tw_amr.h"
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31 #include "typedef.h"
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32 #include "basic_op.h"
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33 #include "oper_32b.h"
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34 #include "no_count.h"
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35 #include "cnst.h"
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36 #include "pow2.h"
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37 #include "log2.h"
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38 #include "gc_pred.h"
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39 #include "qua_gain_tab.h"
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40
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41 /*
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42 ********************************************************************************
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43 * PUBLIC PROGRAM CODE
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44 ********************************************************************************
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45 */
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46
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47 /*************************************************************************
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48 *
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49 * FUNCTION: Dec_gain()
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50 *
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51 * PURPOSE: Decode the pitch and codebook gains
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52 *
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53 ************************************************************************/
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54 void Dec_gain(
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55 gc_predState *pred_state, /* i/o: MA predictor state */
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56 enum Mode mode, /* i : AMR mode */
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57 Word16 index, /* i : index of quantization. */
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58 Word16 code[], /* i : Innovative vector. */
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59 Word16 evenSubfr, /* i : Flag for even subframes */
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60 Word16 * gain_pit, /* o : Pitch gain. */
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61 Word16 * gain_cod /* o : Code gain. */
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62 )
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63 {
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64 const Word16 *p;
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65 Word16 frac, gcode0, exp, qua_ener, qua_ener_MR122;
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66 Word16 g_code;
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67 Word32 L_tmp;
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68
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69 /* Read the quantized gains (table depends on mode) */
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70 index = shl (index, 2);
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71
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72 test(); test(); test();
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73 if ( sub (mode, MR102) == 0
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74 || sub (mode, MR74) == 0
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75 || sub (mode, MR67) == 0)
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76 {
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77 p = &table_gain_highrates[index]; move16 ();
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78
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79 *gain_pit = *p++; move16 ();
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80 g_code = *p++; move16 ();
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81 qua_ener_MR122 = *p++; move16 ();
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82 qua_ener = *p; move16 ();
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83 }
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84 else
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85 {
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86 test();
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87 if (sub (mode, MR475) == 0)
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88 {
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89 index = add (index, shl(sub(1, evenSubfr), 1));
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90 p = &table_gain_MR475[index]; move16 ();
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91
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92 *gain_pit = *p++; move16 ();
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93 g_code = *p++; move16 ();
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94
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95 /*---------------------------------------------------------*
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96 * calculate predictor update values (not stored in 4.75 *
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97 * quantizer table to save space): *
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98 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
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99 * *
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100 * qua_ener = log2(g) *
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101 * qua_ener_MR122 = 20*log10(g) *
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102 *---------------------------------------------------------*/
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103
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104 /* Log2(x Q12) = log2(x) + 12 */
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105 Log2 (L_deposit_l (g_code), &exp, &frac);
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106 exp = sub(exp, 12);
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107
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108 qua_ener_MR122 = add (shr_r (frac, 5), shl (exp, 10));
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109
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110 /* 24660 Q12 ~= 6.0206 = 20*log10(2) */
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111 L_tmp = Mpy_32_16(exp, frac, 24660);
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112 qua_ener = round (L_shl (L_tmp, 13)); /* Q12 * Q0 = Q13 -> Q10 */
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113 }
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114 else
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115 {
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116 p = &table_gain_lowrates[index]; move16 ();
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117
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118 *gain_pit = *p++; move16 ();
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119 g_code = *p++; move16 ();
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120 qua_ener_MR122 = *p++; move16 ();
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121 qua_ener = *p; move16 ();
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122 }
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123 }
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124
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125 /*-------------------------------------------------------------------*
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126 * predict codebook gain *
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127 * ~~~~~~~~~~~~~~~~~~~~~ *
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128 * gc0 = Pow2(int(d)+frac(d)) *
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129 * = 2^exp + 2^frac *
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130 * *
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131 * gcode0 (Q14) = 2^14*2^frac = gc0 * 2^(14-exp) *
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132 *-------------------------------------------------------------------*/
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133
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134 gc_pred(pred_state, mode, code, &exp, &frac, NULL, NULL);
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135
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136 gcode0 = extract_l(Pow2(14, frac));
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137
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138 /*------------------------------------------------------------------*
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139 * read quantized gains, update table of past quantized energies *
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140 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
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141 * st->past_qua_en(Q10) = 20 * Log10(g_fac) / constant *
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142 * = Log2(g_fac) *
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143 * = qua_ener *
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144 * constant = 20*Log10(2) *
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145 *------------------------------------------------------------------*/
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146
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147 L_tmp = L_mult(g_code, gcode0);
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148 L_tmp = L_shr(L_tmp, sub(10, exp));
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149 *gain_cod = extract_h(L_tmp);
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150
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151 /* update table of past quantized energies */
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152
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153 gc_pred_update(pred_state, qua_ener_MR122, qua_ener);
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154
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155 return;
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156 }