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annotate libtwamr/q_gain_c.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 3a25bdfad0d8
children
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3a25bdfad0d8 libtwamr: integrate q_gain_c.c
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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 : q_gain_c.c
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11 * Purpose : Scalar quantization of the innovative
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12 * : codebook gain.
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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 ********************************************************************************
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19 * MODULE INCLUDE FILE AND VERSION ID
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20 ********************************************************************************
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21 */
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22 #include "namespace.h"
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23 #include "q_gain_c.h"
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24
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25 /*
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26 ********************************************************************************
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27 * INCLUDE FILES
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28 ********************************************************************************
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29 */
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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 "log2.h"
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36 #include "pow2.h"
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37 #include "gains_tab.h"
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38
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39 /*
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40 ********************************************************************************
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41 * PUBLIC PROGRAM CODE
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42 ********************************************************************************
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43 */
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44
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45 /*--------------------------------------------------------------------------*
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46 * Function q_gain_code() *
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47 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
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48 * Scalar quantization of the innovative codebook gain. *
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49 * *
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50 *--------------------------------------------------------------------------*/
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51 Word16 q_gain_code ( /* o : quantization index, Q0 */
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52 enum Mode mode, /* i : AMR mode */
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53 Word16 exp_gcode0, /* i : predicted CB gain (exponent), Q0 */
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54 Word16 frac_gcode0, /* i : predicted CB gain (fraction), Q15 */
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55 Word16 *gain, /* i/o: quantized fixed codebook gain, Q1 */
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56 Word16 *qua_ener_MR122, /* o : quantized energy error, Q10 */
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57 /* (for MR122 MA predictor update) */
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58 Word16 *qua_ener /* o : quantized energy error, Q10 */
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59 /* (for other MA predictor update) */
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60 )
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61 {
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62 const Word16 *p;
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63 Word16 i, index;
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64 Word16 gcode0, err, err_min;
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65 Word16 g_q0;
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66
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67 test ();
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68 g_q0 = 0; move16 ();
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69 test ();
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70 if (sub(mode, MR122) == 0)
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71 {
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72 g_q0 = shr (*gain, 1); /* Q1 -> Q0 */
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73 }
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74
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75 /*-------------------------------------------------------------------*
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76 * predicted codebook gain *
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77 * ~~~~~~~~~~~~~~~~~~~~~~~ *
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78 * gc0 = Pow2(int(d)+frac(d)) *
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79 * = 2^exp + 2^frac *
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80 * *
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81 *-------------------------------------------------------------------*/
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82
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83 gcode0 = extract_l (Pow2 (exp_gcode0, frac_gcode0)); /* predicted gain */
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84
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85 test ();
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86 if (sub(mode, MR122) == 0)
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87 {
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88 gcode0 = shl (gcode0, 4);
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89 }
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90 else
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91 {
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92 gcode0 = shl (gcode0, 5);
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93 }
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94
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95 /*-------------------------------------------------------------------*
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96 * Search for best quantizer *
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97 *-------------------------------------------------------------------*/
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98
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99 p = &qua_gain_code[0]; move16 ();
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100 test ();
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101 if (sub(mode, MR122) == 0)
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102 {
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103 err_min = abs_s (sub (g_q0, mult (gcode0, *p++)));
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104 }
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105 else
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106 {
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107 err_min = abs_s (sub (*gain, mult (gcode0, *p++)));
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108 }
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109 p += 2; /* skip quantized energy errors */
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110 index = 0; move16 ();
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111
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112 for (i = 1; i < NB_QUA_CODE; i++)
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113 {
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114 test ();
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115 if (sub(mode, MR122) == 0)
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116 {
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117 err = abs_s (sub (g_q0, mult (gcode0, *p++)));
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118 }
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119 else
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120 {
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121 err = abs_s (sub (*gain, mult (gcode0, *p++)));
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122 }
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123
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124 p += 2; /* skip quantized energy error */
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125
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126 test ();
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127 if (sub (err, err_min) < 0)
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128 {
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129 err_min = err; move16 ();
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130 index = i; move16 ();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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131 }
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Mychaela Falconia <falcon@freecalypso.org>
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132 }
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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133
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Mychaela Falconia <falcon@freecalypso.org>
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134 p = &qua_gain_code[add (add (index,index), index)]; move16 ();
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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135 test ();
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Mychaela Falconia <falcon@freecalypso.org>
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136 if (sub(mode, MR122) == 0)
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Mychaela Falconia <falcon@freecalypso.org>
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137 {
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
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138 *gain = shl (mult (gcode0, *p++), 1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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139 }
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 else
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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141 {
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
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142 *gain = mult (gcode0, *p++);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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143 }
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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144 move16 ();
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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145
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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146 /* quantized error energies (for MA predictor update) */
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 *qua_ener_MR122 = *p++; move16 ();
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 *qua_ener = *p; move16 ();
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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149
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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150 return index;
3a25bdfad0d8 libtwamr: integrate q_gain_c.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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151 }