FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/g_pitch.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents d9229fdac1c7
children 827661987b41
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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 (L_sub (s, MAX_32) != 0L) /* Test for overflow */
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55 {
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56 s = L_add (s, 1L); /* 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
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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125 test ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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126 if (sub (gain, 4915) > 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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127 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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128 gain = 4915; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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129 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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130 return (gain);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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131 }