FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/d2_9pf.c @ 357:fb001496ca8c
libtwamr: integrate dec_lag3.c
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 05 May 2024 22:29:09 +0000 |
parents | 2303ba1490dd |
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rev | line source |
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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 } |