FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/pred_lt.c @ 542:f2d0f2f15d5f

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libgsmefr: add wrapper for TW-TS-001 RTP input
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 28 Sep 2024 06:38:08 +0000
parents df14b0c17e6d
children
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398
df14b0c17e6d libtwamr: integrate pred_lt.c
Mychaela Falconia <falcon@freecalypso.org>
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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 : pred_lt.c
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11 * Purpose : Compute the result of long term prediction
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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 ********************************************************************************
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18 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "pred_lt.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "no_count.h"
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32 #include "cnst.h"
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33
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34 /*
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35 ********************************************************************************
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36 * LOCAL VARIABLES AND TABLES
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37 ********************************************************************************
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38 */
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39 #define UP_SAMP_MAX 6
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40 #define L_INTER10 (L_INTERPOL-1)
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41 #define FIR_SIZE (UP_SAMP_MAX*L_INTER10+1)
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42
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43 /* 1/6 resolution interpolation filter (-3 dB at 3600 Hz) */
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44 /* Note: the 1/3 resolution filter is simply a subsampled
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45 * version of the 1/6 resolution filter, i.e. it uses
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46 * every second coefficient:
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47 *
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48 * inter_3l[k] = inter_6[2*k], 0 <= k <= 3*L_INTER10
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49 */
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50 static const Word16 inter_6[FIR_SIZE] =
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51 {
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52 29443,
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53 28346, 25207, 20449, 14701, 8693, 3143,
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54 -1352, -4402, -5865, -5850, -4673, -2783,
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55 -672, 1211, 2536, 3130, 2991, 2259,
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56 1170, 0, -1001, -1652, -1868, -1666,
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57 -1147, -464, 218, 756, 1060, 1099,
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58 904, 550, 135, -245, -514, -634,
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59 -602, -451, -231, 0, 191, 308,
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60 340, 296, 198, 78, -36, -120,
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61 -163, -165, -132, -79, -19, 34,
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62 73, 91, 89, 70, 38, 0
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63 };
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64
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65 /*
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66 ********************************************************************************
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67 * PUBLIC PROGRAM CODE
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68 ********************************************************************************
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69 */
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70 /*************************************************************************
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71 *
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72 * FUNCTION: Pred_lt_3or6()
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73 *
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74 * PURPOSE: Compute the result of long term prediction with fractional
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75 * interpolation of resolution 1/3 or 1/6. (Interpolated past
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76 * excitation).
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77 *
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78 * DESCRIPTION:
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79 * The past excitation signal at the given delay is interpolated at
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80 * the given fraction to build the adaptive codebook excitation.
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81 * On return exc[0..L_subfr-1] contains the interpolated signal
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82 * (adaptive codebook excitation).
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83 *
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84 *************************************************************************/
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85 void Pred_lt_3or6 (
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86 Word16 exc[], /* in/out: excitation buffer */
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87 Word16 T0, /* input : integer pitch lag */
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88 Word16 frac, /* input : fraction of lag */
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89 Word16 L_subfr, /* input : subframe size */
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90 Word16 flag3 /* input : if set, upsampling rate = 3 (6 otherwise) */
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91 )
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92 {
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93 Word16 i, j, k;
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94 Word16 *x0, *x1, *x2;
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95 const Word16 *c1, *c2;
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96 Word32 s;
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97
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98 x0 = &exc[-T0]; move16 ();
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99
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100 frac = negate (frac);
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101 test();
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102 if (flag3 != 0)
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103 {
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104 frac = shl (frac, 1); /* inter_3l[k] = inter_6[2*k] -> k' = 2*k */
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105 }
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106
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107 test ();
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108 if (frac < 0)
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109 {
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110 frac = add (frac, UP_SAMP_MAX);
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111 x0--;
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112 }
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113
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114 for (j = 0; j < L_subfr; j++)
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115 {
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116 x1 = x0++; move16 ();
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117 x2 = x0; move16 ();
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118 c1 = &inter_6[frac];
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119 c2 = &inter_6[sub (UP_SAMP_MAX, frac)];
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120
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121 s = 0; move32 ();
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122 for (i = 0, k = 0; i < L_INTER10; i++, k += UP_SAMP_MAX)
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123 {
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124 s = L_mac (s, x1[-i], c1[k]);
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125 s = L_mac (s, x2[i], c2[k]);
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126 }
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127
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128 exc[j] = round (s); move16 ();
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129 }
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130
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131 return;
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132 }