FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/g_pitch.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 827661987b41
children
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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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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
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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125 test ();
195
827661987b41 libgsmefr/g_pitch.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 71
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126 if (gain > 4915)
53
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 }