FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/int_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 | 693ea1d5cf1e |
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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 } |