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annotate libtwamr/g_pitch.c @ 431:f0496507d409

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libtwamr: implement amr_dhf_subst_efr()
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 08 May 2024 00:27:51 +0000
parents bd4f660eb75a
children
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bd4f660eb75a libtwamr: integrate g_pitch.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 : g_pitch.c
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11 * Purpose : Compute the pitch (adaptive codebook) gain.
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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 * MODULE INCLUDE FILE AND VERSION ID
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18 ********************************************************************************
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19 */
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20 #include "namespace.h"
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21 #include "g_pitch.h"
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22
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23 /*
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24 ********************************************************************************
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25 * INCLUDE FILES
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26 ********************************************************************************
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27 */
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28 #include "tw_amr.h"
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "oper_32b.h"
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32 #include "no_count.h"
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33 #include "cnst.h"
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34
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35 /*
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36 ********************************************************************************
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37 * PUBLIC PROGRAM CODE
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38 ********************************************************************************
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39 */
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40 /*************************************************************************
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41 *
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42 * FUNCTION: G_pitch
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43 *
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44 * PURPOSE: Compute the pitch (adaptive codebook) gain.
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45 * Result in Q14 (NOTE: 12.2 bit exact using Q12)
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46 *
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47 * DESCRIPTION:
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48 * The adaptive codebook gain is given by
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49 *
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50 * g = <x[], y[]> / <y[], y[]>
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51 *
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52 * where x[] is the target vector, y[] is the filtered adaptive
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53 * codevector, and <> denotes dot product.
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54 * The gain is limited to the range [0,1.2] (=0..19661 Q14)
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55 *
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56 *************************************************************************/
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57 Word16 G_pitch ( /* o : Gain of pitch lag saturated to 1.2 */
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58 enum Mode mode, /* i : AMR mode */
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59 Word16 xn[], /* i : Pitch target. */
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60 Word16 y1[], /* i : Filtered adaptive codebook. */
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61 Word16 g_coeff[], /* i : Correlations need for gain quantization */
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62 Word16 L_subfr /* i : Length of subframe. */
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63 )
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64 {
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65 Word16 i;
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66 Word16 xy, yy, exp_xy, exp_yy, gain;
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67 Word32 s;
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68
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69 Word16 scaled_y1[L_SUBFR]; /* Usually dynamic allocation of (L_subfr) */
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70
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71 /* divide "y1[]" by 4 to avoid overflow */
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72
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73 for (i = 0; i < L_subfr; i++)
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74 {
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75 scaled_y1[i] = shr (y1[i], 2); move16 ();
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76 }
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77
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78 /* Compute scalar product <y1[],y1[]> */
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79
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80 /* Q12 scaling / MR122 */
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81 Overflow = 0; move16 ();
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82 s = 1L; move32 (); /* Avoid case of all zeros */
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83 for (i = 0; i < L_subfr; i++)
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84 {
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85 s = L_mac (s, y1[i], y1[i]);
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86 }
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87 test ();
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88 if (Overflow == 0) /* Test for overflow */
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89 {
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90 exp_yy = norm_l (s);
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91 yy = round (L_shl (s, exp_yy));
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92 }
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93 else
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94 {
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95 s = 1L; move32 (); /* Avoid case of all zeros */
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96 for (i = 0; i < L_subfr; i++)
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97 {
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98 s = L_mac (s, scaled_y1[i], scaled_y1[i]);
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99 }
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100 exp_yy = norm_l (s);
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101 yy = round (L_shl (s, exp_yy));
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102 exp_yy = sub (exp_yy, 4);
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103 }
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104
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105 /* Compute scalar product <xn[],y1[]> */
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106
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107 Overflow = 0; move16 ();
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108 s = 1L; move32 (); /* Avoid case of all zeros */
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109
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110 for (i = 0; i < L_subfr; i++)
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111 {
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112 s = L_mac(s, xn[i], y1[i]);
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113 }
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114 test ();
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115 if (Overflow == 0)
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116 {
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117 exp_xy = norm_l (s);
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118 xy = round (L_shl (s, exp_xy));
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119 }
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120 else
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121 {
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122 s = 1L; move32 (); /* Avoid case of all zeros */
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123 for (i = 0; i < L_subfr; i++)
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124 {
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125 s = L_mac (s, xn[i], scaled_y1[i]);
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126 }
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127 exp_xy = norm_l (s);
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128 xy = round (L_shl (s, exp_xy));
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129 exp_xy = sub (exp_xy, 2);
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130 }
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131
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132 g_coeff[0] = yy; move16 ();
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133 g_coeff[1] = sub (15, exp_yy); move16 ();
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134 g_coeff[2] = xy; move16 ();
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135 g_coeff[3] = sub (15, exp_xy); move16 ();
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136
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137 /* If (xy < 4) gain = 0 */
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138
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139 i = sub (xy, 4);
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140
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141 test ();
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142 if (i < 0)
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143 return ((Word16) 0);
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144
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145 /* compute gain = xy/yy */
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146
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147 xy = shr (xy, 1); /* Be sure xy < yy */
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148 gain = div_s (xy, yy);
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149
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150 i = sub (exp_xy, exp_yy); /* Denormalization of division */
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151 gain = shr (gain, i);
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152
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153 /* if(gain >1.2) gain = 1.2 */
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154
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155 test ();
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156 if (sub (gain, 19661) > 0)
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157 {
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158 gain = 19661; move16 ();
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159 }
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160
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161 test ();
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162 if (sub(mode, MR122) == 0)
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163 {
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164 /* clear 2 LSBits */
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165 gain = gain & 0xfffC; logic16 ();
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166 }
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167
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168 return (gain);
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169 }