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annotate libtwamr/d2_11pf.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 c75327562b5e
children
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c75327562b5e libtwamr: integrate d2_11pf.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 : d2_11pf.c
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11 * Purpose : Algebraic codebook decoder
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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 /*
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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 "d2_11pf.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 #include "cnst.h"
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33
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34 /*
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35 ********************************************************************************
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36 * LOCAL VARIABLES AND TABLES
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37 ********************************************************************************
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38 */
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39 #define NB_PULSE 2 /* number of pulses */
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40
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41 /*
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42 ********************************************************************************
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43 * PUBLIC PROGRAM CODE
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44 ********************************************************************************
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45 */
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46 /*************************************************************************
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47 *
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48 * FUNCTION: decode_2i40_11bits (decod_ACELP())
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49 *
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50 * PURPOSE: Algebraic codebook decoder
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51 *
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52 *************************************************************************/
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53
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54 void decode_2i40_11bits(
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55 Word16 sign, /* i : signs of 2 pulses. */
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56 Word16 index, /* i : Positions of the 2 pulses. */
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57 Word16 cod[] /* o : algebraic (fixed) codebook excitation */
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58 )
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59 {
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60 Word16 i, j;
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61 Word16 pos[NB_PULSE];
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62
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63 /* Decode the positions */
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64
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65 j = index & 1; logic16 ();
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66 index = shr(index, 1);
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67 i = index & 7; logic16 ();
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68
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69 i = add(i, shl(i, 2)); /* pos0 =i*5+1+j*2 */
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70 i = add(i, 1);
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71 j = shl(j, 1);
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72 pos[0] = add(i, j); move16 ();
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73
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74 index = shr(index, 3);
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75 j = index & 3; logic16 ();
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76 index = shr(index, 2);
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77 i = index & 7; logic16 ();
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78
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79 test();
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80 if (sub(j, 3) == 0)
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81 {
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82 i = add(i, shl(i, 2)); /* pos1 =i*5+4 */
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83 pos[1] = add(i, 4); move16 ();
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84 }
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85 else
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86 {
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87 i = add(i, shl(i, 2)); /* pos1 =i*5+j */
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88 pos[1] = add(i, j); move16 ();
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89 }
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90
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91 /* decode the signs and build the codeword */
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92
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93 for (i = 0; i < L_SUBFR; i++) {
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94 cod[i] = 0; move16 ();
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95 }
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96
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97 for (j = 0; j < NB_PULSE; j++) {
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98 i = sign & 1; logic16 ();
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99 sign = shr(sign, 1);
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100
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101 test ();
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102 if (i != 0) {
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103 cod[pos[j]] = 8191; move16 (); /* +1.0 */
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104 } else {
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105 cod[pos[j]] = -8192; move16 (); /* -1.0 */
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106 }
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107 }
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108
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109 return;
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110 }