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annotate libtwamr/int_lsf.c @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 693ea1d5cf1e
children
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693ea1d5cf1e libtwamr: integrate int_lsf.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 : int_lsf.c
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11 *
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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 * MODULE INCLUDE FILE AND VERSION ID
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17 ********************************************************************************
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18 */
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19 #include "namespace.h"
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20 #include "int_lsf.h"
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21
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22 /*
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23 ********************************************************************************
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24 * INCLUDE FILES
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25 ********************************************************************************
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26 */
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27 #include "typedef.h"
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28 #include "basic_op.h"
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29 #include "no_count.h"
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30 #include "cnst.h"
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31
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32 /*
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33 ********************************************************************************
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34 * LOCAL VARIABLES AND TABLES
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35 ********************************************************************************
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36 */
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37 /*
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38 *--------------------------------------*
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39 * Constants (defined in cnst.h) *
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40 *--------------------------------------*
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41 * M : LSF order *
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42 *--------------------------------------*
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43 */
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44
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45 /*
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46 ********************************************************************************
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47 * PUBLIC PROGRAM CODE
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48 ********************************************************************************
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49 */
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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 * Function : Int_lsf
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55 * Purpose : Interpolates the LSFs for selected subframe
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56 * Description : The 20 ms speech frame is divided into 4 subframes.
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57 * The LSFs are interpolated at the 1st, 2nd and 3rd
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58 * subframe and only forwarded at the 4th subframe.
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59 *
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60 * |------|------|------|------|
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61 * sf1 sf2 sf3 sf4
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62 * F0 F1
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63 *
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64 * sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1
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65 * sf2: 1/2 F0 + 1/2 F1 sf4: F1
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66 * Returns : void
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67 *
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68 **************************************************************************
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69 */
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70 void Int_lsf(
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71 Word16 lsf_old[], /* i : LSF vector at the 4th SF of past frame */
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72 Word16 lsf_new[], /* i : LSF vector at the 4th SF of present frame */
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73 Word16 i_subfr, /* i : Pointer to current sf (equal to 0,40,80 or 120) */
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74 Word16 lsf_out[] /* o : interpolated LSF parameters for current sf */
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75 )
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76 {
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77 Word16 i;
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78
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79 if ( i_subfr == 0 )
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80 {
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81 test ();
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82 for (i = 0; i < M; i++) {
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83 lsf_out[i] = add(sub(lsf_old[i], shr(lsf_old[i], 2)), shr(lsf_new[i], 2));
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84 move16 ();
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85 }
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86 }
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87 else if ( sub(i_subfr, 40) == 0 )
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88 {
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89 test (); test ();
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90 for (i = 0; i < M; i++) {
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91 lsf_out[i] = add(shr(lsf_old[i],1), shr(lsf_new[i], 1) );
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92 move16 ();
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93 }
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94 }
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95 else if ( sub(i_subfr, 80) == 0 )
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96 {
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97 test (); test (); test ();
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98 for (i = 0; i < M; i++) {
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99 lsf_out[i] = add(shr(lsf_old[i], 2), sub(lsf_new[i], shr(lsf_new[i], 2)));
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100 move16 ();
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101 }
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102 }
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103 else if ( sub(i_subfr, 120) == 0 )
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104 {
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105 test (); test (); test (); test ();
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106 for (i = 0; i < M; i++) {
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107 lsf_out[i] = lsf_new[i]; move16 ();
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108 }
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109 }
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110
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111 return;
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112 }