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annotate libtwamr/agc.c @ 256:a33edf624061

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libgsmfr2: start with API definition and port of libgsmfrp code
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 12 Apr 2024 20:49:53 +0000
parents 07f936338de1
children 6b33f3ba4289
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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 <stdlib.h>
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29 #include <stdio.h>
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30 #include "typedef.h"
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31 #include "basic_op.h"
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32 #include "no_count.h"
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33 #include "cnst.h"
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34 #include "inv_sqrt.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
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42 /*
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43 *****************************************************************************
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44 * LOCAL PROGRAM CODE
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45 *****************************************************************************
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46 */
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47
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48 static Word32 energy_old( /* o : return energy of signal */
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49 Word16 in[], /* i : input signal (length l_trm) */
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50 Word16 l_trm /* i : signal length */
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51 )
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52 {
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53 Word32 s;
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54 Word16 i, temp;
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55
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56 temp = shr (in[0], 2);
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57 s = L_mult (temp, temp);
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58
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59 for (i = 1; i < l_trm; i++)
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60 {
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61 temp = shr (in[i], 2);
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62 s = L_mac (s, temp, temp);
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63 }
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64
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65 return s;
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66 }
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67
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68 static Word32 energy_new( /* o : return energy of signal */
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69 Word16 in[], /* i : input signal (length l_trm) */
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70 Word16 l_trm /* i : signal length */
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71 )
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72 {
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73 Word32 s;
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74 Word16 i;
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75 Flag ov_save;
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76
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77 ov_save = Overflow; move16 (); /* save overflow flag in case energy_old */
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78 /* must be called */
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79 s = L_mult(in[0], in[0]);
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80 for (i = 1; i < l_trm; i++)
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81 {
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82 s = L_mac(s, in[i], in[i]);
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83 }
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84
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85 /* check for overflow */
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86 test ();
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87 if (L_sub (s, MAX_32) == 0L)
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88 {
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89 Overflow = ov_save; move16 (); /* restore overflow flag */
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90 s = energy_old (in, l_trm); move32 (); /* function result */
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91 }
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92 else
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93 {
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94 s = L_shr(s, 4);
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95 }
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96
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97 return s;
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98 }
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99 /*
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100 *****************************************************************************
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101 * PUBLIC PROGRAM CODE
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102 *****************************************************************************
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103 */
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104 /*
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105 **************************************************************************
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106 *
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107 * Function : agc_init
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108 * Purpose : Allocates memory for agc state and initializes
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109 * state memory
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110 *
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111 **************************************************************************
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112 */
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113 int agc_init (agcState **state)
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114 {
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115 agcState* s;
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116
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117 if (state == (agcState **) NULL){
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118 fprintf(stderr, "agc_init: invalid parameter\n");
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119 return -1;
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120 }
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121 *state = NULL;
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122
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123 /* allocate memory */
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124 if ((s= (agcState *) malloc(sizeof(agcState))) == NULL){
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125 fprintf(stderr, "agc_init: can not malloc state structure\n");
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126 return -1;
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127 }
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128
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129 agc_reset(s);
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130 *state = s;
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131
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132 return 0;
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133 }
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134
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135 /*
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136 **************************************************************************
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137 *
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138 * Function : agc_reset
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139 * Purpose : Reset of agc (i.e. set state memory to 1.0)
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140 *
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141 **************************************************************************
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142 */
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143 int agc_reset (agcState *state)
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144 {
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145 if (state == (agcState *) NULL){
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146 fprintf(stderr, "agc_reset: invalid parameter\n");
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147 return -1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 }
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 state->past_gain = 4096; /* initial value of past_gain = 1.0 */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 return 0;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 }
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 /*
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 **************************************************************************
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 *
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 * Function : agc_exit
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 * Purpose : The memory used for state memory is freed
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 *
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 **************************************************************************
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 void agc_exit (agcState **state)
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 {
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 if (state == NULL || *state == NULL)
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 return;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 /* deallocate memory */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 free(*state);
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 *state = NULL;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 return;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 }
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 /*
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 **************************************************************************
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 *
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 * Function : agc
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 * Purpose : Scales the postfilter output on a subframe basis
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 *
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 **************************************************************************
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 int agc (
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 agcState *st, /* i/o : agc state */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 Word16 *sig_in, /* i : postfilter input signal (l_trm) */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 Word16 *sig_out, /* i/o : postfilter output signal (l_trm) */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 Word16 agc_fac, /* i : AGC factor */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 Word16 l_trm /* i : subframe size */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 )
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 {
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 Word16 i, exp;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 Word16 gain_in, gain_out, g0, gain;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 Word32 s;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 /* calculate gain_out with exponent */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 s = energy_new(sig_out, l_trm); move32 (); /* function result */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 test ();
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 if (s == 0)
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 {
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 st->past_gain = 0; move16 ();
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 return 0;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 }
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 exp = sub (norm_l (s), 1);
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 gain_out = round (L_shl (s, exp));
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 /* calculate gain_in with exponent */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 s = energy_new(sig_in, l_trm); move32 (); /* function result */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 test ();
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 if (s == 0)
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 {
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 g0 = 0; move16 ();
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 }
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 else
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 {
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 i = norm_l (s);
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 gain_in = round (L_shl (s, i));
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 exp = sub (exp, i);
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 /*---------------------------------------------------*
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 * g0 = (1-agc_fac) * sqrt(gain_in/gain_out); *
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 *---------------------------------------------------*/
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 s = L_deposit_l (div_s (gain_out, gain_in));
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 s = L_shl (s, 7); /* s = gain_out / gain_in */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 s = L_shr (s, exp); /* add exponent */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 s = Inv_sqrt (s); move32 (); /* function result */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 i = round (L_shl (s, 9));
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 /* g0 = i * (1-agc_fac) */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 g0 = mult (i, sub (32767, agc_fac));
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234 }
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236 /* compute gain[n] = agc_fac * gain[n-1]
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
237 + (1-agc_fac) * sqrt(gain_in/gain_out) */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
238 /* sig_out[n] = gain[n] * sig_out[n] */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 gain = st->past_gain; move16 ();
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242 for (i = 0; i < l_trm; i++)
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243 {
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
244 gain = mult (gain, agc_fac);
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
245 gain = add (gain, g0);
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
246 sig_out[i] = extract_h (L_shl (L_mult (sig_out[i], gain), 3));
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
247 move16 ();
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
248 }
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
249
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
250 st->past_gain = gain; move16 ();
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
251
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
252 return 0;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
253 }
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
254
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
255 /*
54f6bc41ed10 libtwamr: integrate a* modules
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 * Function : agc2
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
259 * Purpose : Scales the excitation on a subframe basis
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
260 *
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
261 **************************************************************************
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
262 */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
263 void agc2 (
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
264 Word16 *sig_in, /* i : postfilter input signal */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
265 Word16 *sig_out, /* i/o : postfilter output signal */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
266 Word16 l_trm /* i : subframe size */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
267 )
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
268 {
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
269 Word16 i, exp;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
270 Word16 gain_in, gain_out, g0;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
271 Word32 s;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
272
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
273 /* calculate gain_out with exponent */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
274 s = energy_new(sig_out, l_trm); move32 (); /* function result */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
275
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
276 test ();
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
277 if (s == 0)
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
278 {
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
279 return;
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
280 }
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
281 exp = sub (norm_l (s), 1);
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
282 gain_out = round (L_shl (s, exp));
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
283
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
284 /* calculate gain_in with exponent */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
285 s = energy_new(sig_in, l_trm); move32 (); /* function result */
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
286
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
287 test ();
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
288 if (s == 0)
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
289 {
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
290 g0 = 0; move16 ();
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
291 }
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
292 else
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
293 {
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
294 i = norm_l (s);
54f6bc41ed10 libtwamr: integrate a* modules
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
295 gain_in = round (L_shl (s, i));
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296 exp = sub (exp, i);
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297
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298 /*---------------------------------------------------*
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299 * g0 = sqrt(gain_in/gain_out); *
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300 *---------------------------------------------------*/
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301
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302 s = L_deposit_l (div_s (gain_out, gain_in));
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303 s = L_shl (s, 7); /* s = gain_out / gain_in */
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304 s = L_shr (s, exp); /* add exponent */
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305
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306 s = Inv_sqrt (s); move32 (); /* function result */
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307 g0 = round (L_shl (s, 9));
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308 }
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309
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310 /* sig_out(n) = gain(n) sig_out(n) */
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311
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312 for (i = 0; i < l_trm; i++)
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313 {
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314 sig_out[i] = extract_h (L_shl (L_mult (sig_out[i], g0), 3));
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315 move16 ();
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316 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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317
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Mychaela Falconia <falcon@freecalypso.org>
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318 return;
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319 }