FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/dec_lag3.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 fb001496ca8c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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fb001496ca8c libtwamr: integrate dec_lag3.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 : dec_lag3.c
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11 * Purpose : Decoding of fractional pitch lag with 1/3 resolution.
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12 * Extract the integer and fraction parts of the pitch lag from
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13 * the received adaptive codebook index.
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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 ********************************************************************************
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20 * MODULE INCLUDE FILE AND VERSION ID
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21 ********************************************************************************
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22 */
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23 #include "namespace.h"
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24 #include "dec_lag3.h"
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25
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26 /*
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27 ********************************************************************************
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28 * INCLUDE FILES
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29 ********************************************************************************
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30 */
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31 #include "typedef.h"
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32 #include "basic_op.h"
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33 #include "no_count.h"
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34
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35 /*
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36 ********************************************************************************
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37 * LOCAL VARIABLES AND TABLES
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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 ********************************************************************************
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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 * FUNCTION: Dec_lag3
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48 *
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49 * PURPOSE: Decoding of fractional pitch lag with 1/3 resolution.
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50 * Extract the integer and fraction parts of the pitch lag from
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51 * the received adaptive codebook index.
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52 *
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53 * See "Enc_lag3.c" for more details about the encoding procedure.
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54 *
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55 * The fractional lag in 1st and 3rd subframes is encoded with 8 bits
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56 * while that in 2nd and 4th subframes is relatively encoded with 4, 5
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57 * and 6 bits depending on the mode.
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58 *
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59 *************************************************************************/
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60 void Dec_lag3(Word16 index, /* i : received pitch index */
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61 Word16 t0_min, /* i : minimum of search range */
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62 Word16 t0_max, /* i : maximum of search range */
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63 Word16 i_subfr, /* i : subframe flag */
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64 Word16 T0_prev, /* i : integer pitch delay of last subframe
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65 used in 2nd and 4th subframes */
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66 Word16 * T0, /* o : integer part of pitch lag */
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67 Word16 * T0_frac, /* o : fractional part of pitch lag */
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68 Word16 flag4 /* i : flag for encoding with 4 bits */
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69 )
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70 {
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71 Word16 i;
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72 Word16 tmp_lag;
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73
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74 test ();
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75 if (i_subfr == 0) { /* if 1st or 3rd subframe */
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76 test ();
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77 if (sub(index, 197) < 0) {
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78
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79 *T0 = add(mult(add(index, 2), 10923), 19);
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80
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81 i = add(add(*T0, *T0), *T0);
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82 *T0_frac = add(sub(index, i), 58);
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83 } else {
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84 *T0 = sub(index, 112);
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85 *T0_frac = 0; move16 ();
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86 }
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87
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88 } else { /* 2nd or 4th subframe */
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89
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90 test ();
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91 if (flag4 == 0) {
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92
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93 /* 'normal' decoding: either with 5 or 6 bit resolution */
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94
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95 i = sub(mult(add(index, 2), 10923), 1);
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96 *T0 = add(i, t0_min);
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97
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98 i = add(add(i, i), i);
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99 *T0_frac = sub(sub(index, 2), i);
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100 }
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101 else {
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102
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103 /* decoding with 4 bit resolution */
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104
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105 tmp_lag = T0_prev; move16 ();
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106
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107 test ();
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108 if ( sub( sub(tmp_lag, t0_min), 5) > 0)
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109 tmp_lag = add (t0_min, 5);
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110 test ();
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111 if ( sub( sub(t0_max, tmp_lag), 4) > 0)
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112 tmp_lag = sub (t0_max, 4);
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113
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114 test ();
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115 if (sub(index, 4) < 0)
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116 {
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117 i = sub(tmp_lag, 5);
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118 *T0 = add(i, index);
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119 *T0_frac = 0; move16 ();
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120 }
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121 else
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122 {
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123 test ();
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124 if (sub(index, 12) < 0)
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125 {
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126 i = sub(mult(sub(index, 5), 10923), 1);
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127 *T0 = add(i, tmp_lag);
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128
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129 i = add(add(i, i), i);
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130 *T0_frac = sub(sub(index, 9), i);
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131 }
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132 else
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133 {
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134 i = add( sub (index, 12), tmp_lag);
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135 *T0 = add (i, 1);
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136 *T0_frac = 0; move16 ();
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137 }
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138 }
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139
fb001496ca8c libtwamr: integrate dec_lag3.c
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140 } /* end if (decoding with 4 bit resolution) */
fb001496ca8c libtwamr: integrate dec_lag3.c
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141 }
fb001496ca8c libtwamr: integrate dec_lag3.c
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142
fb001496ca8c libtwamr: integrate dec_lag3.c
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143 return;
fb001496ca8c libtwamr: integrate dec_lag3.c
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144 }