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annotate libtwamr/g_adapt.c @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 2a265be82195
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 : g_adapt.c
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11 * Purpose : gain adaptation for MR795 gain quantization
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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 "g_adapt.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 "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 #include "gmed_n.h"
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35
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36 /*
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37 ********************************************************************************
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38 * LOCAL VARIABLES AND TABLES
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39 ********************************************************************************
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40 */
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41 #define LTP_GAIN_THR1 2721 /* 2721 Q13 = 0.3322 ~= 1.0 / (10*log10(2)) */
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42 #define LTP_GAIN_THR2 5443 /* 5443 Q13 = 0.6644 ~= 2.0 / (10*log10(2)) */
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43
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44 /*
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45 ********************************************************************************
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46 * PUBLIC PROGRAM CODE
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47 ********************************************************************************
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48 */
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49
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50 /*************************************************************************
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51 *
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52 * Function: gain_adapt_reset
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53 * Purpose: Initializes state memory to zero
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54 *
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55 **************************************************************************
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56 */
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57 void gain_adapt_reset (GainAdaptState *st)
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58 {
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59 Word16 i;
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60
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61 st->onset = 0;
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62 st->prev_alpha = 0;
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63 st->prev_gc = 0;
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64
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65 for (i = 0; i < LTPG_MEM_SIZE; i++)
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66 {
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67 st->ltpg_mem[i] = 0;
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68 }
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69 }
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70
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71 /*************************************************************************
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72 *
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73 * Function: gain_adapt()
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74 * Purpose: calculate pitch/codebook gain adaptation factor alpha
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75 * (and update the adaptor state)
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76 *
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77 **************************************************************************
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78 */
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79 void gain_adapt(
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80 GainAdaptState *st, /* i : state struct */
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81 Word16 ltpg, /* i : ltp coding gain (log2()), Q13 */
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82 Word16 gain_cod, /* i : code gain, Q1 */
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83 Word16 *alpha /* o : gain adaptation factor, Q15 */
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84 )
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85 {
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86 Word16 adapt; /* adaptdation status; 0, 1, or 2 */
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87 Word16 result; /* alpha factor, Q13 */
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88 Word16 filt; /* median-filtered LTP coding gain, Q13 */
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89 Word16 tmp, i;
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90
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91 /* basic adaptation */
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92 test ();
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93 if (sub (ltpg, LTP_GAIN_THR1) <= 0)
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94 {
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95 adapt = 0; move16 ();
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96 }
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97 else
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98 {
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99 test ();
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100 if (sub (ltpg, LTP_GAIN_THR2) <= 0)
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101 {
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102 adapt = 1; move16 ();
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103 }
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104 else
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105 {
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106 adapt = 2; move16 ();
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107 }
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108 }
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109
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110 /*
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111 * // onset indicator
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112 * if ((cbGain > onFact * cbGainMem[0]) && (cbGain > 100.0))
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113 * onset = 8;
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114 * else
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115 * if (onset)
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116 * onset--;
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117 */
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118 /* tmp = cbGain / onFact; onFact = 2.0; 200 Q1 = 100.0 */
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119 tmp = shr_r (gain_cod, 1);
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120 test (); test ();
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121 if ((sub (tmp, st->prev_gc) > 0) && sub(gain_cod, 200) > 0)
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122 {
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123 st->onset = 8; move16 ();
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124 }
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125 else
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126 {
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127 test ();
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128 if (st->onset != 0)
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129 {
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130 st->onset = sub (st->onset, 1); move16 ();
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131 }
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132 }
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133
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134 /*
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135 * // if onset, increase adaptor state
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136 * if (onset && (gainAdapt < 2)) gainAdapt++;
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137 */
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138 test(); test ();
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139 if ((st->onset != 0) && (sub (adapt, 2) < 0))
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140 {
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141 adapt = add (adapt, 1);
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142 }
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143
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144 st->ltpg_mem[0] = ltpg; move16 ();
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145 filt = gmed_n (st->ltpg_mem, 5); move16 (); /* function result */
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parents:
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146
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147 test ();
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148 if (adapt == 0)
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149 {
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150 test ();
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151 if (sub (filt, 5443) > 0) /* 5443 Q13 = 0.66443... */
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152 {
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153 result = 0; move16 ();
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154 }
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155 else
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156 {
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157 test ();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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158 if (filt < 0)
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159 {
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160 result = 16384; move16 (); /* 16384 Q15 = 0.5 */
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161 }
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162 else
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parents:
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163 { /* result = 0.5 - 0.75257499*filt */
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parents:
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164 /* result (Q15) = 16384 - 24660 * (filt << 2) */
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parents:
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165 filt = shl (filt, 2); /* Q15 */
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parents:
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166 result = sub (16384, mult (24660, filt));
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parents:
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167 }
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168 }
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parents:
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169 }
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parents:
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170 else
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parents:
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171 {
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172 result = 0; move16 ();
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parents:
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173 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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174 /*
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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175 * if (prevAlpha == 0.0) result = 0.5 * (result + prevAlpha);
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parents:
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176 */
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177 test ();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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178 if (st->prev_alpha == 0)
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parents:
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179 {
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parents:
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180 result = shr (result, 1);
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parents:
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181 }
2a265be82195 libtwamr: integrate g_adapt.c
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parents:
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182
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parents:
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183 /* store the result */
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parents:
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184 *alpha = result; move16 ();
2a265be82195 libtwamr: integrate g_adapt.c
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parents:
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185
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parents:
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186 /* update adapter state memory */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 st->prev_alpha = result; move16 ();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 st->prev_gc = gain_cod; move16 ();
2a265be82195 libtwamr: integrate g_adapt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189
2a265be82195 libtwamr: integrate g_adapt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 for (i = LTPG_MEM_SIZE-1; i > 0; i--)
2a265be82195 libtwamr: integrate g_adapt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 {
2a265be82195 libtwamr: integrate g_adapt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 st->ltpg_mem[i] = st->ltpg_mem[i-1]; move16 ();
2a265be82195 libtwamr: integrate g_adapt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 }
2a265be82195 libtwamr: integrate g_adapt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 /* mem[0] is just present for convenience in calling the gmed_n[5]
2a265be82195 libtwamr: integrate g_adapt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 * function above. The memory depth is really LTPG_MEM_SIZE-1.
2a265be82195 libtwamr: integrate g_adapt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 */
2a265be82195 libtwamr: integrate g_adapt.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 }