FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/g_pitch.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents 827661987b41
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*************************************************************************
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2 *
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3 * FUNCTION: G_pitch
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4 *
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5 * PURPOSE: Compute the pitch (adaptive codebook) gain. Result in Q12
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6 *
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7 * DESCRIPTION:
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8 * The adaptive codebook gain is given by
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9 *
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10 * g = <x[], y[]> / <y[], y[]>
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11 *
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12 * where x[] is the target vector, y[] is the filtered adaptive
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13 * codevector, and <> denotes dot product.
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14 * The gain is limited to the range [0,1.2]
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15 *
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16 *************************************************************************/
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17
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18 #include "gsm_efr.h"
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19 #include "typedef.h"
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20 #include "namespace.h"
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21 #include "basic_op.h"
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22 #include "oper_32b.h"
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23 #include "no_count.h"
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24 #include "sig_proc.h"
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25 #include "codec.h"
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26
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27 Word16 G_pitch ( /* (o) : Gain of pitch lag saturated to 1.2 */
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28 Word16 xn[], /* (i) : Pitch target. */
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29 Word16 y1[], /* (i) : Filtered adaptive codebook. */
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30 Word16 L_subfr /* : Length of subframe. */
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31 )
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32 {
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33 Word16 i;
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34 Word16 xy, yy, exp_xy, exp_yy, gain;
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35 Word32 s;
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36
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37 Word16 scaled_y1[80]; /* Usually dynamic allocation of (L_subfr) */
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38
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39 /* divide by 2 "y1[]" to avoid overflow */
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40
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41 for (i = 0; i < L_subfr; i++)
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42 {
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43 scaled_y1[i] = shr (y1[i], 2); move16 ();
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44 }
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45
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46 /* Compute scalar product <y1[],y1[]> */
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47
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48 s = 0L; move32 (); /* Avoid case of all zeros */
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49 for (i = 0; i < L_subfr; i++)
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50 {
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51 s = L_mac (s, y1[i], y1[i]);
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52 }
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53 test ();
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54 if (s != MAX_32) /* Test for overflow */
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55 {
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56 s++; /* Avoid case of all zeros */
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57 exp_yy = norm_l (s);
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58 yy = round (L_shl (s, exp_yy));
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59 }
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60 else
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61 {
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62 s = 1L; move32 (); /* Avoid case of all zeros */
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63 for (i = 0; i < L_subfr; i++)
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64 {
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65 s = L_mac (s, scaled_y1[i], scaled_y1[i]);
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66 }
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67 exp_yy = norm_l (s);
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68 yy = round (L_shl (s, exp_yy));
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69 exp_yy = sub (exp_yy, 4);
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70 }
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71
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72 /* Compute scalar product <xn[],y1[]> */
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73
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74 Overflow = 0; move16 ();
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75 s = 1L; move32 (); /* Avoid case of all zeros */
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76 for (i = 0; i < L_subfr; i++)
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77 {
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78 Carry = 0; move16 ();
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79 s = L_macNs (s, xn[i], y1[i]);
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80
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81 test ();
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82 if (Overflow != 0)
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83 {
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84 break;
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85 }
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86 }
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87 test ();
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88 if (Overflow == 0)
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89 {
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90 exp_xy = norm_l (s);
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91 xy = round (L_shl (s, exp_xy));
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92 }
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93 else
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94 {
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95 s = 1L; move32 (); /* Avoid case of all zeros */
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96 for (i = 0; i < L_subfr; i++)
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97 {
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98 s = L_mac (s, xn[i], scaled_y1[i]);
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99 }
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100 exp_xy = norm_l (s);
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101 xy = round (L_shl (s, exp_xy));
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102 exp_xy = sub (exp_xy, 2);
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103 }
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104
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105 /* If (xy < 4) gain = 0 */
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106
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107 i = sub (xy, 4);
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108
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109 test ();
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110 if (i < 0)
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111 return ((Word16) 0);
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112
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113 /* compute gain = xy/yy */
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114
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115 xy = shr (xy, 1); /* Be sure xy < yy */
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116 gain = div_s (xy, yy);
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117
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118 i = add (exp_xy, 3 - 1); /* Denormalization of division */
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119 i = sub (i, exp_yy);
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120
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121 gain = shr (gain, i);
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122
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123 /* if(gain >1.2) gain = 1.2 */
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124
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125 test ();
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126 if (gain > 4915)
53
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 gain = 4915; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 return (gain);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 }