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annotate libtwamr/d2_9pf.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents 2303ba1490dd
children
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2303ba1490dd libtwamr: integrate d2_9pf.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_9pf.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_9pf.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 #include "c2_9pf.tab"
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42
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43 /*
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44 ********************************************************************************
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45 * PUBLIC PROGRAM CODE
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46 ********************************************************************************
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47 */
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48 /*************************************************************************
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49 *
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50 * FUNCTION: decode_2i40_9bits (decod_ACELP())
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51 *
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52 * PURPOSE: Algebraic codebook decoder. For details about the encoding se
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53 * c2_9pf.c
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54 *
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55 *************************************************************************/
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56
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57 void decode_2i40_9bits(
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58 Word16 subNr, /* i : subframe number */
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59 Word16 sign, /* i : signs of 2 pulses. */
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60 Word16 index, /* i : Positions of the 2 pulses. */
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61 Word16 cod[] /* o : algebraic (fixed) codebook excitation */
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62 )
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63 {
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64 Word16 i, j, k;
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65 Word16 pos[NB_PULSE];
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66
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67 /* Decode the positions */
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68 /* table bit is the MSB */
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69 j = shr((index & 64),6); logic16 ();
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70
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71 i = index & 7; logic16 ();
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72
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73 i = add(i, shl(i, 2)); /* pos0 =i*5+startPos[j*8+subNr*2] */
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74 k = startPos[add(shl(j, 3), shl(subNr, 1))];
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75 pos[0] = add(i, k); move16 ();
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76
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77 index = shr(index, 3);
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78 i = index & 7; logic16 ();
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79
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80 i = add(i, shl(i, 2)); /* pos1 =i*5+startPos[j*8+subNr*2+1] */
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81 k = startPos[add(add(shl(j, 3), shl(subNr, 1)), 1)];
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82 pos[1] = add(i, k); move16 ();
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83
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84 /* decode the signs and build the codeword */
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85
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86 for (i = 0; i < L_SUBFR; i++) {
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87 cod[i] = 0; move16 ();
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88 }
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89
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90 for (j = 0; j < NB_PULSE; j++) {
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91 i = sign & 1; logic16 ();
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92 sign = shr(sign, 1);
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93
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94 test ();
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95 if (i != 0) {
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96 cod[pos[j]] = 8191; move16 (); /* +1.0 */
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97 } else {
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98 cod[pos[j]] = -8192; move16 (); /* -1.0 */
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99 }
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100 }
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101
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102 return;
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103 }