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annotate src/post_pro.c @ 5:799b56cbccb6

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EFR2 decoder: add post-processing step from AMR
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 03 Apr 2024 06:09:10 +0000
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799b56cbccb6 EFR2 decoder: add post-processing step from AMR
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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 : post_pro.c
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11 * Purpose : Postprocessing of output speech.
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12 *
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13 * - 2nd order high pass filtering with cut
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14 * off frequency at 60 Hz.
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15 * - Multiplication of output by two.
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16 *
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17 ********************************************************************************
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18 */
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19
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20
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21 /*
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22 ********************************************************************************
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23 * MODULE INCLUDE FILE AND VERSION ID
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24 ********************************************************************************
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25 */
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26 #if 0
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27 #include "post_pro.h"
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28 const char post_pro_id[] = "@(#)$Id $" post_pro_h;
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29 #endif
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30
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31 /*
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32 ********************************************************************************
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33 * INCLUDE FILES
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34 ********************************************************************************
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35 */
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36 #include <stdlib.h>
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37 #include <stdio.h>
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38 #include "typedef.h"
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39 #include "basic_op.h"
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40 #include "oper_32b.h"
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41 #include "count.h"
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42 #include "post_pro.h"
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43
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44 /*
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45 ********************************************************************************
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46 * LOCAL VARIABLES AND TABLES
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47 ********************************************************************************
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48 */
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49 /* filter coefficients (fc = 60 Hz) */
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50 static const Word16 b[3] = {7699, -15398, 7699};
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51 static const Word16 a[3] = {8192, 15836, -7667};
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52
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53 typedef struct {
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54 Word16 y2_hi;
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55 Word16 y2_lo;
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56 Word16 y1_hi;
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57 Word16 y1_lo;
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58 Word16 x0;
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59 Word16 x1;
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60 } Post_ProcessState;
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61
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62 static Post_ProcessState ppstate;
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63
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64 /*
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65 ********************************************************************************
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66 * PUBLIC PROGRAM CODE
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67 ********************************************************************************
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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: Post_Process_reset
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73 * Purpose: Initializes state memory to zero
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74 *
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75 **************************************************************************
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76 */
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77 void AMR_postproc_reset (void)
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78 {
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79 Post_ProcessState *state = &ppstate;
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80
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81 state->y2_hi = 0;
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82 state->y2_lo = 0;
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83 state->y1_hi = 0;
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84 state->y1_lo = 0;
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85 state->x0 = 0;
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86 state->x1 = 0;
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87 }
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88
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89 /*************************************************************************
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90 *
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91 * FUNCTION: Post_Process()
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92 *
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93 * PURPOSE: Postprocessing of input speech.
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94 *
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95 * DESCRIPTION:
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96 * - 2nd order high pass filtering with cut off frequency at 60 Hz.
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97 * - Multiplication of output by two.
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98 *
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99 * Algorithm:
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100 *
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101 * y[i] = b[0]*x[i]*2 + b[1]*x[i-1]*2 + b[2]*x[i-2]*2
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102 * + a[1]*y[i-1] + a[2]*y[i-2];
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103 *
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104 *
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105 *************************************************************************/
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106 void Post_Process (
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107 Word16 signal[], /* i/o : signal */
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108 Word16 lg /* i : length of signal */
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109 )
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110 {
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111 Post_ProcessState *st = &ppstate;
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112 Word16 i, x2;
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113 Word32 L_tmp;
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114
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115 test (); test ();
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116 for (i = 0; i < lg; i++)
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117 {
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118 x2 = st->x1; move16 ();
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119 st->x1 = st->x0; move16 ();
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120 st->x0 = signal[i]; move16 ();
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121
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122 /* y[i] = b[0]*x[i]*2 + b[1]*x[i-1]*2 + b140[2]*x[i-2]/2 */
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123 /* + a[1]*y[i-1] + a[2] * y[i-2]; */
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124
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125 L_tmp = Mpy_32_16 (st->y1_hi, st->y1_lo, a[1]);
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126 L_tmp = L_add (L_tmp, Mpy_32_16 (st->y2_hi, st->y2_lo, a[2]));
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127 L_tmp = L_mac (L_tmp, st->x0, b[0]);
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128 L_tmp = L_mac (L_tmp, st->x1, b[1]);
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129 L_tmp = L_mac (L_tmp, x2, b[2]);
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130 L_tmp = L_shl (L_tmp, 2);
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131
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132 /* Multiplication by two of output speech with saturation. */
799b56cbccb6 EFR2 decoder: add post-processing step from AMR
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 signal[i] = round(L_shl(L_tmp, 1)); move16 ();
799b56cbccb6 EFR2 decoder: add post-processing step from AMR
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134
799b56cbccb6 EFR2 decoder: add post-processing step from AMR
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 st->y2_hi = st->y1_hi; move16 ();
799b56cbccb6 EFR2 decoder: add post-processing step from AMR
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 st->y2_lo = st->y1_lo; move16 ();
799b56cbccb6 EFR2 decoder: add post-processing step from AMR
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 L_Extract (L_tmp, &st->y1_hi, &st->y1_lo);
799b56cbccb6 EFR2 decoder: add post-processing step from AMR
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 }
799b56cbccb6 EFR2 decoder: add post-processing step from AMR
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 }