FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/lsp_lsf.c @ 421:09534cdc59ec
libtwamr/tw_amr.h: rm trailing spaces from enum Mode list
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 07 May 2024 05:40:10 +0000 |
parents | 05a46720af0f |
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rev | line source |
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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 } |