FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/agc.c @ 359:dfb1f86541b2
libtwamr/tls_flags.c: use namespace.h for the right prefix
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 05 May 2024 22:56:24 +0000 |
parents | 6b33f3ba4289 |
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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 : agc.c |
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11 * |
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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 "agc.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 #include "inv_sqrt.h" |
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33 |
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34 /* |
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35 ***************************************************************************** |
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36 * LOCAL VARIABLES AND TABLES |
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37 ***************************************************************************** |
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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 * LOCAL PROGRAM CODE |
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43 ***************************************************************************** |
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44 */ |
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45 |
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46 static Word32 energy_old( /* o : return energy of signal */ |
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47 Word16 in[], /* i : input signal (length l_trm) */ |
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48 Word16 l_trm /* i : signal length */ |
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49 ) |
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50 { |
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51 Word32 s; |
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52 Word16 i, temp; |
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53 |
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54 temp = shr (in[0], 2); |
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55 s = L_mult (temp, temp); |
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56 |
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57 for (i = 1; i < l_trm; i++) |
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58 { |
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59 temp = shr (in[i], 2); |
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60 s = L_mac (s, temp, temp); |
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61 } |
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62 |
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63 return s; |
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64 } |
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65 |
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66 static Word32 energy_new( /* o : return energy of signal */ |
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67 Word16 in[], /* i : input signal (length l_trm) */ |
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68 Word16 l_trm /* i : signal length */ |
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69 ) |
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70 { |
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71 Word32 s; |
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72 Word16 i; |
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73 Flag ov_save; |
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74 |
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75 ov_save = Overflow; move16 (); /* save overflow flag in case energy_old */ |
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76 /* must be called */ |
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77 s = L_mult(in[0], in[0]); |
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78 for (i = 1; i < l_trm; i++) |
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79 { |
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80 s = L_mac(s, in[i], in[i]); |
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81 } |
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82 |
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83 /* check for overflow */ |
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84 test (); |
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85 if (L_sub (s, MAX_32) == 0L) |
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86 { |
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87 Overflow = ov_save; move16 (); /* restore overflow flag */ |
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88 s = energy_old (in, l_trm); move32 (); /* function result */ |
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89 } |
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90 else |
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91 { |
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92 s = L_shr(s, 4); |
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93 } |
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94 |
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95 return s; |
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96 } |
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97 /* |
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98 ***************************************************************************** |
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99 * PUBLIC PROGRAM CODE |
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100 ***************************************************************************** |
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101 */ |
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102 /* |
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103 ************************************************************************** |
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104 * |
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105 * Function : agc_reset |
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106 * Purpose : Reset of agc (i.e. set state memory to 1.0) |
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107 * |
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108 ************************************************************************** |
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109 */ |
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110 void agc_reset (agcState *state) |
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111 { |
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112 state->past_gain = 4096; /* initial value of past_gain = 1.0 */ |
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113 } |
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114 |
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115 /* |
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116 ************************************************************************** |
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117 * |
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118 * Function : agc |
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119 * Purpose : Scales the postfilter output on a subframe basis |
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120 * |
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121 ************************************************************************** |
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122 */ |
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123 int agc ( |
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124 agcState *st, /* i/o : agc state */ |
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125 Word16 *sig_in, /* i : postfilter input signal (l_trm) */ |
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126 Word16 *sig_out, /* i/o : postfilter output signal (l_trm) */ |
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127 Word16 agc_fac, /* i : AGC factor */ |
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128 Word16 l_trm /* i : subframe size */ |
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129 ) |
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130 { |
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131 Word16 i, exp; |
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132 Word16 gain_in, gain_out, g0, gain; |
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133 Word32 s; |
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134 |
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135 /* calculate gain_out with exponent */ |
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136 s = energy_new(sig_out, l_trm); move32 (); /* function result */ |
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137 |
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138 test (); |
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139 if (s == 0) |
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140 { |
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141 st->past_gain = 0; move16 (); |
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142 return 0; |
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143 } |
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144 exp = sub (norm_l (s), 1); |
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145 gain_out = round (L_shl (s, exp)); |
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146 |
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147 /* calculate gain_in with exponent */ |
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148 s = energy_new(sig_in, l_trm); move32 (); /* function result */ |
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149 |
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150 test (); |
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151 if (s == 0) |
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152 { |
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153 g0 = 0; move16 (); |
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154 } |
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155 else |
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156 { |
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157 i = norm_l (s); |
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158 gain_in = round (L_shl (s, i)); |
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159 exp = sub (exp, i); |
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160 |
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161 /*---------------------------------------------------* |
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162 * g0 = (1-agc_fac) * sqrt(gain_in/gain_out); * |
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163 *---------------------------------------------------*/ |
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164 |
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165 s = L_deposit_l (div_s (gain_out, gain_in)); |
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166 s = L_shl (s, 7); /* s = gain_out / gain_in */ |
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167 s = L_shr (s, exp); /* add exponent */ |
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168 |
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169 s = Inv_sqrt (s); move32 (); /* function result */ |
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170 i = round (L_shl (s, 9)); |
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171 |
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172 /* g0 = i * (1-agc_fac) */ |
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173 g0 = mult (i, sub (32767, agc_fac)); |
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174 } |
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175 |
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176 /* compute gain[n] = agc_fac * gain[n-1] |
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177 + (1-agc_fac) * sqrt(gain_in/gain_out) */ |
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178 /* sig_out[n] = gain[n] * sig_out[n] */ |
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179 |
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180 gain = st->past_gain; move16 (); |
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181 |
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182 for (i = 0; i < l_trm; i++) |
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183 { |
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184 gain = mult (gain, agc_fac); |
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185 gain = add (gain, g0); |
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186 sig_out[i] = extract_h (L_shl (L_mult (sig_out[i], gain), 3)); |
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187 move16 (); |
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188 } |
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189 |
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190 st->past_gain = gain; move16 (); |
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191 |
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192 return 0; |
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193 } |
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194 |
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195 /* |
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196 ************************************************************************** |
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197 * |
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198 * Function : agc2 |
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199 * Purpose : Scales the excitation on a subframe basis |
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200 * |
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201 ************************************************************************** |
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202 */ |
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203 void agc2 ( |
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204 Word16 *sig_in, /* i : postfilter input signal */ |
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205 Word16 *sig_out, /* i/o : postfilter output signal */ |
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206 Word16 l_trm /* i : subframe size */ |
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207 ) |
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208 { |
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209 Word16 i, exp; |
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210 Word16 gain_in, gain_out, g0; |
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211 Word32 s; |
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212 |
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213 /* calculate gain_out with exponent */ |
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214 s = energy_new(sig_out, l_trm); move32 (); /* function result */ |
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215 |
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216 test (); |
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217 if (s == 0) |
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218 { |
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219 return; |
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220 } |
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221 exp = sub (norm_l (s), 1); |
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222 gain_out = round (L_shl (s, exp)); |
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223 |
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224 /* calculate gain_in with exponent */ |
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225 s = energy_new(sig_in, l_trm); move32 (); /* function result */ |
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226 |
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227 test (); |
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228 if (s == 0) |
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229 { |
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230 g0 = 0; move16 (); |
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231 } |
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232 else |
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233 { |
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234 i = norm_l (s); |
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235 gain_in = round (L_shl (s, i)); |
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236 exp = sub (exp, i); |
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237 |
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238 /*---------------------------------------------------* |
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239 * g0 = sqrt(gain_in/gain_out); * |
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240 *---------------------------------------------------*/ |
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241 |
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242 s = L_deposit_l (div_s (gain_out, gain_in)); |
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243 s = L_shl (s, 7); /* s = gain_out / gain_in */ |
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244 s = L_shr (s, exp); /* add exponent */ |
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245 |
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246 s = Inv_sqrt (s); move32 (); /* function result */ |
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247 g0 = round (L_shl (s, 9)); |
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248 } |
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249 |
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250 /* sig_out(n) = gain(n) sig_out(n) */ |
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251 |
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252 for (i = 0; i < l_trm; i++) |
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253 { |
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254 sig_out[i] = extract_h (L_shl (L_mult (sig_out[i], g0), 3)); |
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255 move16 (); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
256 } |
54f6bc41ed10
libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
257 |
54f6bc41ed10
libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
258 return; |
54f6bc41ed10
libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
259 } |