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annotate libtwamr/lsp_lsf.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 05a46720af0f
children
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05a46720af0f libtwamr: integrate d_plsf_3.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 : lsp_lsf.c
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11 * Purpose : Lsp_lsf: Transformation lsp to lsf
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12 * : Lsf_lsp: Transformation lsf to lsp
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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 "lsp_lsf.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
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33 /*
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34 ********************************************************************************
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35 * LOCAL VARIABLES AND TABLES
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36 ********************************************************************************
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37 */
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38 #include "lsp_lsf.tab" /* Look-up table for transformations */
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39
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40 /*
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41 ********************************************************************************
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42 * PUBLIC PROGRAM CODE
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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 * FUNCTIONS: Lsp_lsf and Lsf_lsp
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48 *
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49 * PURPOSE:
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50 * Lsp_lsf: Transformation lsp to lsf
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51 * Lsf_lsp: Transformation lsf to lsp
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52 *
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53 * DESCRIPTION:
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54 * lsp[i] = cos(2*pi*lsf[i]) and lsf[i] = arccos(lsp[i])/(2*pi)
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55 *
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56 * The transformation from lsp[i] to lsf[i] and lsf[i] to lsp[i] are
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57 * approximated by a look-up table and interpolation.
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58 *
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59 *************************************************************************/
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60 void Lsf_lsp (
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61 Word16 lsf[], /* (i) : lsf[m] normalized (range: 0.0<=val<=0.5) */
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62 Word16 lsp[], /* (o) : lsp[m] (range: -1<=val<1) */
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63 Word16 m /* (i) : LPC order */
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64 )
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65 {
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66 Word16 i, ind, offset;
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67 Word32 L_tmp;
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68
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69 for (i = 0; i < m; i++)
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70 {
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71 ind = shr (lsf[i], 8); /* ind = b8-b15 of lsf[i] */
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72 offset = lsf[i] & 0x00ff; logic16 (); /* offset = b0-b7 of lsf[i] */
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73
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74 /* lsp[i] = table[ind]+ ((table[ind+1]-table[ind])*offset) / 256 */
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75
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76 L_tmp = L_mult (sub (table[ind + 1], table[ind]), offset);
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77 lsp[i] = add (table[ind], extract_l (L_shr (L_tmp, 9)));
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78 move16 ();
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79 }
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80 return;
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81 }
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82
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83 void Lsp_lsf (
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84 Word16 lsp[], /* (i) : lsp[m] (range: -1<=val<1) */
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85 Word16 lsf[], /* (o) : lsf[m] normalized (range: 0.0<=val<=0.5) */
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86 Word16 m /* (i) : LPC order */
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87 )
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88 {
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89 Word16 i, ind;
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90 Word32 L_tmp;
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91
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92 ind = 63; move16 (); /* begin at end of table -1 */
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93
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94 for (i = m - 1; i >= 0; i--)
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95 {
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96 /* find value in table that is just greater than lsp[i] */
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97 test ();
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98 while (sub (table[ind], lsp[i]) < 0)
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99 {
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100 ind--;
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101 test ();
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102 }
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103
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104 /* acos(lsp[i])= ind*256 + ( ( lsp[i]-table[ind] ) *
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105 slope[ind] )/4096 */
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106
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107 L_tmp = L_mult (sub (lsp[i], table[ind]), slope[ind]);
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108 /*(lsp[i]-table[ind])*slope[ind])>>12*/
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109 lsf[i] = round (L_shl (L_tmp, 3)); move16 ();
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110 lsf[i] = add (lsf[i], shl (ind, 8)); move16 ();
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111 }
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112 return;
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113 }