FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/g_adapt.c @ 387:7818f466a639
libtwamr: integrate lsp.tab
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 06 May 2024 06:36:40 +0000 |
parents | 2a265be82195 |
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rev | line source |
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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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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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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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163 { /* result = 0.5 - 0.75257499*filt */ |
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164 /* result (Q15) = 16384 - 24660 * (filt << 2) */ |
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165 filt = shl (filt, 2); /* Q15 */ |
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166 result = sub (16384, mult (24660, filt)); |
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167 } |
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168 } |
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169 } |
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170 else |
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171 { |
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172 result = 0; move16 (); |
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173 } |
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174 /* |
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175 * if (prevAlpha == 0.0) result = 0.5 * (result + prevAlpha); |
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176 */ |
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177 test (); |
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178 if (st->prev_alpha == 0) |
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179 { |
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180 result = shr (result, 1); |
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181 } |
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182 |
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183 /* store the result */ |
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184 *alpha = result; move16 (); |
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185 |
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186 /* update adapter state memory */ |
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187 st->prev_alpha = result; move16 (); |
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188 st->prev_gc = gain_cod; move16 (); |
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189 |
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190 for (i = LTPG_MEM_SIZE-1; i > 0; i--) |
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191 { |
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192 st->ltpg_mem[i] = st->ltpg_mem[i-1]; move16 (); |
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193 } |
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194 /* mem[0] is just present for convenience in calling the gmed_n[5] |
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195 * function above. The memory depth is really LTPG_MEM_SIZE-1. |
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196 */ |
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197 } |