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annotate libtwamr/enc_lag3.c @ 553:ebcf414b7d99

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doc/TFO-transform: describe details for FRv1, both modes
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 07 Oct 2024 08:24:24 +0000
parents 0349de7c45b7
children
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363
0349de7c45b7 libtwamr: integrate enc_lag[36].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 : enc_lag3.c
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11 * Purpose : Encoding of fractional pitch lag with 1/3 resolution.
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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 "enc_lag3.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 "typedef.h"
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29 #include "basic_op.h"
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30 #include "no_count.h"
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31 #include "cnst.h"
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32
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33 /*
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34 ********************************************************************************
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35 * PUBLIC PROGRAM CODE
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36 ********************************************************************************
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37 */
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38 /*************************************************************************
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39 *
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40 * FUNCTION: Enc_lag3
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41 *
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42 * PURPOSE: Encoding of fractional pitch lag with 1/3 resolution.
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43 *
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44 * DESCRIPTION:
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45 * First and third subframes:
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46 * --------------------------
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47 * The pitch range is divided as follows:
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48 * 19 1/3 to 84 2/3 resolution 1/3
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49 * 85 to 143 resolution 1
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50 *
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51 * The period is encoded with 8 bits.
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52 * For the range with fractions:
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53 * index = (T-19)*3 + frac - 1;
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54 * where T=[19..85] and frac=[-1,0,1]
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55 * and for the integer only range
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56 * index = (T - 85) + 197; where T=[86..143]
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57 *
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58 * Second and fourth subframes:
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59 * ----------------------------
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60 * For the 2nd and 4th subframes a resolution of 1/3 is always used,
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61 * and the search range is relative to the lag in previous subframe.
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62 * If t0 is the lag in the previous subframe then
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63 * t_min=t0-5 and t_max=t0+4 and the range is given by
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64 * t_min - 2/3 to t_max + 2/3
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65 *
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66 * The period in the 2nd (and 4th) subframe is encoded with 5 bits:
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67 * index = (T-(t_min-1))*3 + frac - 1;
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68 * where T=[t_min-1..t_max+1]
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69 *
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70 *************************************************************************/
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71 Word16
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72 Enc_lag3( /* o : Return index of encoding */
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73 Word16 T0, /* i : Pitch delay */
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74 Word16 T0_frac, /* i : Fractional pitch delay */
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75 Word16 T0_prev, /* i : Integer pitch delay of last subframe */
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76 Word16 T0_min, /* i : minimum of search range */
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77 Word16 T0_max, /* i : maximum of search range */
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78 Word16 delta_flag, /* i : Flag for 1st (or 3rd) subframe */
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79 Word16 flag4 /* i : Flag for encoding with 4 bits */
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80 )
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81 {
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82 Word16 index, i, tmp_ind, uplag;
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83 Word16 tmp_lag;
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84
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85 test ();
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86 if (delta_flag == 0)
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87 { /* if 1st or 3rd subframe */
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88
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89 /* encode pitch delay (with fraction) */
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90
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91 test ();
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92 if (sub (T0, 85) <= 0)
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93 {
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94 /* index = T0*3 - 58 + T0_frac */
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95 i = add (add (T0, T0), T0);
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96 index = add (sub (i, 58), T0_frac);
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97 }
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98 else
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99 {
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100 index = add (T0, 112);
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101 }
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102 }
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103 else
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104 { /* if second or fourth subframe */
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105 test ();
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106 if (flag4 == 0) {
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107
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108 /* 'normal' encoding: either with 5 or 6 bit resolution */
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109
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110 /* index = 3*(T0 - T0_min) + 2 + T0_frac */
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111 i = sub (T0, T0_min);
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112 i = add (add (i, i), i);
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113 index = add (add (i, 2), T0_frac);
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114 }
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115 else {
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116
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117 /* encoding with 4 bit resolution */
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118
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119 tmp_lag = T0_prev; move16 ();
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120
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121 test ();
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122 if ( sub( sub(tmp_lag, T0_min), 5) > 0)
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123 tmp_lag = add (T0_min, 5);
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124 test ();
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125 if ( sub( sub(T0_max, tmp_lag), 4) > 0)
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126 tmp_lag = sub (T0_max, 4);
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127
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128 uplag = add (add (add (T0, T0), T0), T0_frac);
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129
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130 i = sub (tmp_lag, 2);
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131 tmp_ind = add (add (i, i), i);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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132
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133 test ();
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134 if (sub (tmp_ind, uplag) >= 0) {
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135 index = add (sub (T0, tmp_lag), 5);
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136 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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137 else
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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138 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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139 i = add (tmp_lag, 1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 i = add (add (i, i), i);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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141
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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142 test ();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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143 if (sub (i, uplag) > 0) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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144 index = add ( sub (uplag, tmp_ind), 3);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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145 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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146 else {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 index = add (sub (T0, tmp_lag), 11);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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149 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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150
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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151 } /* end if (encoding with 4 bit resolution) */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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152 } /* end if (second of fourth subframe) */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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153
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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154 return index;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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155 }