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annotate libtwamr/cor_h.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 5401aaf7acb0
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 : cor_h.c
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11 * Purpose : correlation functions for codebook search
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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 "cor_h.h"
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22 /*
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23 *****************************************************************************
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24 * INCLUDE FILES
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25 *****************************************************************************
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26 */
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27 #include "typedef.h"
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28 #include "basic_op.h"
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29 #include "no_count.h"
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30 #include "inv_sqrt.h"
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31 #include "cnst.h"
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32
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33 /*
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34 *****************************************************************************
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35 * PUBLIC PROGRAM CODE
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36 *****************************************************************************
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37 */
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38 /*************************************************************************
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39 *
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40 * FUNCTION: cor_h_x()
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41 *
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42 * PURPOSE: Computes correlation between target signal "x[]" and
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43 * impulse response"h[]".
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44 *
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45 * DESCRIPTION:
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46 * The correlation is given by:
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47 * d[n] = sum_{i=n}^{L-1} x[i] h[i-n] n=0,...,L-1
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48 *
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49 * d[n] is normalized such that the sum of 5 maxima of d[n] corresponding
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50 * to each position track does not saturate.
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51 *
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52 *************************************************************************/
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53 void cor_h_x (
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54 Word16 h[], /* (i): impulse response of weighted synthesis filter */
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55 Word16 x[], /* (i): target */
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56 Word16 dn[], /* (o): correlation between target and h[] */
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57 Word16 sf /* (i): scaling factor: 2 for 12.2, 1 for others */
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58 )
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59 {
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60 cor_h_x2(h, x, dn, sf, NB_TRACK, STEP);
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61 }
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62
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63 /*************************************************************************
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64 *
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65 * FUNCTION: cor_h_x2()
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66 *
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67 * PURPOSE: Computes correlation between target signal "x[]" and
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68 * impulse response"h[]".
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69 *
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70 * DESCRIPTION:
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71 * See cor_h_x, d[n] can be normalized regards to sum of the
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72 * five MR122 maxima or the four MR102 maxima.
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73 *
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74 *************************************************************************/
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75 void cor_h_x2 (
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76 Word16 h[], /* (i): impulse response of weighted synthesis filter */
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77 Word16 x[], /* (i): target */
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78 Word16 dn[], /* (o): correlation between target and h[] */
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79 Word16 sf, /* (i): scaling factor: 2 for 12.2, 1 for others */
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80 Word16 nb_track,/* (i): the number of ACB tracks */
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81 Word16 step /* (i): step size from one pulse position to the next
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82 in one track */
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83 )
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84 {
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85 Word16 i, j, k;
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86 Word32 s, y32[L_CODE], max, tot;
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87
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88 /* first keep the result on 32 bits and find absolute maximum */
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89
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90 tot = 5; move32 ();
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91
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92 for (k = 0; k < nb_track; k++)
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93 {
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94 max = 0; move32 ();
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95 for (i = k; i < L_CODE; i += step)
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96 {
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97 s = 0; move32 ();
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98 for (j = i; j < L_CODE; j++)
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99 s = L_mac (s, x[j], h[j - i]);
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100
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101 y32[i] = s; move32 ();
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102
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103 s = L_abs (s);
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104 test ();
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105 if (L_sub (s, max) > (Word32) 0L)
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106 max = s; move32 ();
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107 }
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108 tot = L_add (tot, L_shr (max, 1));
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109 }
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110
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111 j = sub (norm_l (tot), sf);
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112
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113 for (i = 0; i < L_CODE; i++)
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114 {
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115 dn[i] = round (L_shl (y32[i], j)); move16 ();
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116 }
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117 }
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118
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119 /*************************************************************************
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120 *
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121 * FUNCTION: cor_h()
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122 *
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123 * PURPOSE: Computes correlations of h[] needed for the codebook search;
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124 * and includes the sign information into the correlations.
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125 *
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126 * DESCRIPTION: The correlations are given by
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127 * rr[i][j] = sum_{n=i}^{L-1} h[n-i] h[n-j]; i>=j; i,j=0,...,L-1
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128 *
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129 * and the sign information is included by
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130 * rr[i][j] = rr[i][j]*sign[i]*sign[j]
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131 *
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132 *************************************************************************/
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133
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134 void cor_h (
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135 Word16 h[], /* (i) : impulse response of weighted synthesis
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parents:
diff changeset
136 filter */
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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137 Word16 sign[], /* (i) : sign of d[n] */
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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138 Word16 rr[][L_CODE] /* (o) : matrix of autocorrelation */
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 )
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 {
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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141 Word16 i, j, k, dec, h2[L_CODE];
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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142 Word32 s;
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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144 /* Scaling for maximum precision */
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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146 s = 2; move32 ();
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 for (i = 0; i < L_CODE; i++)
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 s = L_mac (s, h[i], h[i]);
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 j = sub (extract_h (s), 32767);
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 test ();
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 if (j == 0)
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 {
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 for (i = 0; i < L_CODE; i++)
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 {
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 h2[i] = shr (h[i], 1); move16 ();
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 }
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 }
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 else
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 {
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 s = L_shr (s, 1);
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 k = extract_h (L_shl (Inv_sqrt (s), 7));
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 k = mult (k, 32440); /* k = 0.99*k */
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 for (i = 0; i < L_CODE; i++)
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 {
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 h2[i] = round (L_shl (L_mult (h[i], k), 9));
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 move16 ();
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 }
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 }
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 /* build matrix rr[] */
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 s = 0; move32 ();
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 i = L_CODE - 1;
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 for (k = 0; k < L_CODE; k++, i--)
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 {
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 s = L_mac (s, h2[k], h2[k]);
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 rr[i][i] = round (s); move16 ();
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 }
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 for (dec = 1; dec < L_CODE; dec++)
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 {
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 s = 0; move32 ();
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 j = L_CODE - 1;
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 i = sub (j, dec);
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 for (k = 0; k < (L_CODE - dec); k++, i--, j--)
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 {
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 s = L_mac (s, h2[k], h2[k + dec]);
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 rr[j][i] = mult (round (s), mult (sign[i], sign[j]));
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 move16 ();
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 rr[i][j] = rr[j][i]; move16 ();
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 }
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 }
5401aaf7acb0 libtwamr: integrate cor_h.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 }