FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/d4_17pf.c @ 458:e26b974f7ba3

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doc/AMR-study-utils: update for the current situation
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 10 May 2024 18:45:36 +0000
parents dfaa8f322a8d
children
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dfaa8f322a8d libtwamr: integrate d4_17pf.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 : d4_17pf.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 "d4_17pf.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 #include "graytab.h"
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34
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35 /*
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36 ********************************************************************************
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37 * LOCAL VARIABLES AND TABLES
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38 ********************************************************************************
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39 */
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40 #define NB_PULSE 4
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41
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42 /*
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43 ********************************************************************************
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44 * PUBLIC PROGRAM CODE
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45 ********************************************************************************
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46 */
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47 /*************************************************************************
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48 *
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49 * FUNCTION: decod_ACELP()
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50 *
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51 * PURPOSE: Algebraic codebook decoder
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52 *
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53 *************************************************************************/
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54
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55 void decode_4i40_17bits(
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56 Word16 sign, /* i : signs of 4 pulses. */
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57 Word16 index, /* i : Positions of the 4 pulses. */
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58 Word16 cod[] /* o : algebraic (fixed) codebook excitation */
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59 )
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60 {
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61 Word16 i, j;
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62 Word16 pos[NB_PULSE];
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63
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64 /* Decode the positions */
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65
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66 i = index & 7; logic16 ();
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67 i = dgray[i]; move16 ();
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68
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69 pos[0] = add(i, shl(i, 2)); /* pos0 =i*5 */ move16 ();
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70
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71 index = shr(index, 3);
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72 i = index & 7; logic16 ();
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73 i = dgray[i]; move16 ();
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74
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75 i = add(i, shl(i, 2)); /* pos1 =i*5+1 */
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76 pos[1] = add(i, 1); move16 ();
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77
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78 index = shr(index, 3);
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79 i = index & 7; logic16 ();
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80 i = dgray[i]; move16 ();
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81
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82 i = add(i, shl(i, 2)); /* pos2 =i*5+1 */
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83 pos[2] = add(i, 2); move16 ();
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84
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85 index = shr(index, 3);
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86 j = index & 1; logic16 ();
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87 index = shr(index, 1);
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88 i = index & 7; logic16 ();
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89 i = dgray[i]; move16 ();
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90
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91 i = add(i, shl(i, 2)); /* pos3 =i*5+3+j */
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92 i = add(i, 3);
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93 pos[3] = add(i, j); move16 ();
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94
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95 /* decode the signs and build the codeword */
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96
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97 for (i = 0; i < L_SUBFR; i++) {
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98 cod[i] = 0; move16 ();
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99 }
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100
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101 for (j = 0; j < NB_PULSE; j++) {
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102 i = sign & 1; logic16 ();
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103 sign = shr(sign, 1);
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104
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105 test ();
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106 if (i != 0) {
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107 cod[pos[j]] = 8191; move16 ();
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108 } else {
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109 cod[pos[j]] = -8192; move16 ();
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110 }
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111 }
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112
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113 return;
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114 }