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annotate libgsmefr/agc.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents 7b11cbe99a0e
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: agc
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4 *
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5 * PURPOSE: Scales the postfilter output on a subframe basis by automatic
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6 * control of the subframe gain.
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7 *
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8 * DESCRIPTION:
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9 * sig_out[n] = sig_out[n] * gain[n];
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10 * where gain[n] is the gain at the nth sample given by
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11 * gain[n] = agc_fac * gain[n-1] + (1 - agc_fac) g_in/g_out
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12 * g_in/g_out is the square root of the ratio of energy at the input
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13 * and output of the postfilter.
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14 *
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15 *************************************************************************/
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16
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17 #include "gsm_efr.h"
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18 #include "typedef.h"
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19 #include "namespace.h"
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20 #include "basic_op.h"
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21 #include "no_count.h"
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22 #include "cnst.h"
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23 #include "dec_state.h"
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24 #include "sig_proc.h"
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25
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26 void agc (
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27 struct EFR_decoder_state *st,
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28 Word16 *sig_in, /* (i) : postfilter input signal */
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29 Word16 *sig_out, /* (i/o) : postfilter output signal */
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30 Word16 agc_fac, /* (i) : AGC factor */
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31 Word16 l_trm /* (i) : subframe size */
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32 )
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33 {
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34 Word16 i, exp;
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35 Word16 gain_in, gain_out, g0, gain;
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36 Word32 s;
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37
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38 Word16 temp;
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39
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40 /* calculate gain_out with exponent */
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41
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42 temp = shr (sig_out[0], 2);
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43 s = L_mult (temp, temp);
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44
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45 for (i = 1; i < l_trm; i++)
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46 {
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47 temp = shr (sig_out[i], 2);
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48 s = L_mac (s, temp, temp);
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49 }
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50
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51 if (s == 0)
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52 {
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53 st->past_gain = 0;
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54 return;
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55 }
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56 exp = sub (norm_l (s), 1);
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57 gain_out = round (L_shl (s, exp));
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58
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59 /* calculate gain_in with exponent */
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61 temp = shr (sig_in[0], 2);
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62 s = L_mult (temp, temp);
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63
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64 for (i = 1; i < l_trm; i++)
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65 {
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66 temp = shr (sig_in[i], 2);
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67 s = L_mac (s, temp, temp);
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68 }
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70 if (s == 0)
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71 {
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72 g0 = 0;
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73 }
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74 else
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75 {
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76 i = norm_l (s);
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77 gain_in = round (L_shl (s, i));
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78 exp = sub (exp, i);
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79
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80 /*---------------------------------------------------*
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81 * g0 = (1-agc_fac) * sqrt(gain_in/gain_out); *
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82 *---------------------------------------------------*/
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83
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84 s = L_deposit_l (div_s (gain_out, gain_in));
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85 s = L_shl (s, 7); /* s = gain_out / gain_in */
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86 s = L_shr (s, exp); /* add exponent */
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87
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88 s = Inv_sqrt (s);
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89 i = round (L_shl (s, 9));
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90
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91 /* g0 = i * (1-agc_fac) */
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92 g0 = mult (i, sub (32767, agc_fac));
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93 }
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94
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95 /* compute gain[n] = agc_fac * gain[n-1]
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96 + (1-agc_fac) * sqrt(gain_in/gain_out) */
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97 /* sig_out[n] = gain[n] * sig_out[n] */
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98
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99 gain = st->past_gain;
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100
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101 for (i = 0; i < l_trm; i++)
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102 {
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103 gain = mult (gain, agc_fac);
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104 gain = add (gain, g0);
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105 sig_out[i] = extract_h (L_shl (L_mult (sig_out[i], gain), 3));
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106 }
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107
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108 st->past_gain = gain;
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109
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110 return;
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111 }
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112
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113 void agc2 (
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114 Word16 *sig_in, /* (i) : postfilter input signal */
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115 Word16 *sig_out, /* (i/o) : postfilter output signal */
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116 Word16 l_trm /* (i) : subframe size */
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117 )
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118 {
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119 Word16 i, exp;
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120 Word16 gain_in, gain_out, g0;
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121 Word32 s;
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122
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123 Word16 temp;
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124
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125 /* calculate gain_out with exponent */
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126
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127 temp = shr (sig_out[0], 2);
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128 s = L_mult (temp, temp);
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129 for (i = 1; i < l_trm; i++)
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130 {
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131 temp = shr (sig_out[i], 2);
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132 s = L_mac (s, temp, temp);
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133 }
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134
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135 test ();
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136 if (s == 0)
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137 {
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138 return;
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139 }
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140 exp = sub (norm_l (s), 1);
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141 gain_out = round (L_shl (s, exp));
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142
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143 /* calculate gain_in with exponent */
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144
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145 temp = shr (sig_in[0], 2);
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146 s = L_mult (temp, temp);
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147 for (i = 1; i < l_trm; i++)
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148 {
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149 temp = shr (sig_in[i], 2);
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150 s = L_mac (s, temp, temp);
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151 }
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152
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153 test ();
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154 if (s == 0)
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155 {
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156 g0 = 0; move16 ();
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157 }
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158 else
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159 {
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160 i = norm_l (s);
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161 gain_in = round (L_shl (s, i));
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162 exp = sub (exp, i);
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163
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164 /*---------------------------------------------------*
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165 * g0 = sqrt(gain_in/gain_out); *
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166 *---------------------------------------------------*/
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167
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168 s = L_deposit_l (div_s (gain_out, gain_in));
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169 s = L_shl (s, 7); /* s = gain_out / gain_in */
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170 s = L_shr (s, exp); /* add exponent */
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171
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172 s = Inv_sqrt (s);
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173 g0 = round (L_shl (s, 9));
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174 }
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175
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176 /* sig_out(n) = gain(n) sig_out(n) */
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177
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178 for (i = 0; i < l_trm; i++)
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179 {
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180 sig_out[i] = extract_h (L_shl (L_mult (sig_out[i], g0), 3));
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181 move16 ();
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182 }
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183
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184 return;
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185 }