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annotate libtwamr/post_pro.c @ 458:e26b974f7ba3

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doc/AMR-study-utils: update for the current situation
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 10 May 2024 18:45:36 +0000
parents a0f914a28371
children
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a0f914a28371 libtwamr: integrate post_pro.c
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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 * MODULE INCLUDE FILE AND VERSION ID
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23 ********************************************************************************
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24 */
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25 #include "namespace.h"
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26 #include "post_pro.h"
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27
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28 /*
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29 ********************************************************************************
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30 * INCLUDE FILES
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31 ********************************************************************************
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32 */
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33 #include "typedef.h"
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34 #include "basic_op.h"
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35 #include "oper_32b.h"
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36 #include "no_count.h"
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37
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38 /*
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39 ********************************************************************************
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40 * LOCAL VARIABLES AND TABLES
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41 ********************************************************************************
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42 */
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43 /* filter coefficients (fc = 60 Hz) */
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44 static const Word16 b[3] = {7699, -15398, 7699};
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45 static const Word16 a[3] = {8192, 15836, -7667};
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46
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47 /*
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48 ********************************************************************************
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49 * PUBLIC PROGRAM CODE
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50 ********************************************************************************
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51 */
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52
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53 /*************************************************************************
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54 *
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55 * Function: Post_Process_reset
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56 * Purpose: Initializes state memory to zero
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57 *
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58 **************************************************************************
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59 */
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60 void Post_Process_reset (Post_ProcessState *state)
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61 {
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62 state->y2_hi = 0;
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63 state->y2_lo = 0;
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64 state->y1_hi = 0;
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65 state->y1_lo = 0;
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66 state->x0 = 0;
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67 state->x1 = 0;
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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()
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73 *
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74 * PURPOSE: Postprocessing of input speech.
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75 *
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76 * DESCRIPTION:
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77 * - 2nd order high pass filtering with cut off frequency at 60 Hz.
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78 * - Multiplication of output by two.
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79 *
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80 * Algorithm:
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81 *
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82 * y[i] = b[0]*x[i]*2 + b[1]*x[i-1]*2 + b[2]*x[i-2]*2
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83 * + a[1]*y[i-1] + a[2]*y[i-2];
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84 *
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85 *
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86 *************************************************************************/
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87 int Post_Process (
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88 Post_ProcessState *st, /* i/o : post process state */
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89 Word16 signal[], /* i/o : signal */
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90 Word16 lg /* i : length of signal */
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91 )
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92 {
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93 Word16 i, x2;
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94 Word32 L_tmp;
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95
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96 test (); test ();
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97 for (i = 0; i < lg; i++)
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98 {
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99 x2 = st->x1; move16 ();
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100 st->x1 = st->x0; move16 ();
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101 st->x0 = signal[i]; move16 ();
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102
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103 /* y[i] = b[0]*x[i]*2 + b[1]*x[i-1]*2 + b140[2]*x[i-2]/2 */
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104 /* + a[1]*y[i-1] + a[2] * y[i-2]; */
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105
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106 L_tmp = Mpy_32_16 (st->y1_hi, st->y1_lo, a[1]);
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107 L_tmp = L_add (L_tmp, Mpy_32_16 (st->y2_hi, st->y2_lo, a[2]));
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108 L_tmp = L_mac (L_tmp, st->x0, b[0]);
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109 L_tmp = L_mac (L_tmp, st->x1, b[1]);
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110 L_tmp = L_mac (L_tmp, x2, b[2]);
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111 L_tmp = L_shl (L_tmp, 2);
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112
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113 /* Multiplication by two of output speech with saturation. */
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114 signal[i] = round(L_shl(L_tmp, 1)); move16 ();
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115
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116 st->y2_hi = st->y1_hi; move16 ();
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117 st->y2_lo = st->y1_lo; move16 ();
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118 L_Extract (L_tmp, &st->y1_hi, &st->y1_lo);
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119 }
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120
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121 return 0;
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122 }