FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/g_code.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 |
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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 : g_code.c |
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11 * Purpose : Compute the innovative codebook gain. |
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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 * MODULE INCLUDE FILE AND VERSION ID |
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18 ******************************************************************************** |
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19 */ |
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20 #include "namespace.h" |
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21 #include "g_code.h" |
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22 |
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23 /* |
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24 ******************************************************************************** |
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25 * INCLUDE FILES |
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26 ******************************************************************************** |
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27 */ |
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28 #include "typedef.h" |
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29 #include "basic_op.h" |
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30 #include "no_count.h" |
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31 #include "cnst.h" |
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32 |
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33 /* |
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34 ******************************************************************************** |
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35 * LOCAL VARIABLES AND TABLES |
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36 ******************************************************************************** |
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37 */ |
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38 |
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39 /* |
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40 ******************************************************************************** |
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41 * PUBLIC PROGRAM CODE |
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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 * FUNCTION: G_code |
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47 * |
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48 * PURPOSE: Compute the innovative codebook gain. |
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49 * |
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50 * DESCRIPTION: |
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51 * The innovative codebook gain is given by |
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52 * |
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53 * g = <x[], y[]> / <y[], y[]> |
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54 * |
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55 * where x[] is the target vector, y[] is the filtered innovative |
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56 * codevector, and <> denotes dot product. |
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57 * |
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58 *************************************************************************/ |
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59 Word16 G_code ( /* out : Gain of innovation code */ |
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60 Word16 xn2[], /* in : target vector */ |
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61 Word16 y2[] /* in : filtered innovation vector */ |
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62 ) |
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63 { |
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64 Word16 i; |
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65 Word16 xy, yy, exp_xy, exp_yy, gain; |
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66 Word16 scal_y2[L_SUBFR]; |
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67 Word32 s; |
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68 |
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69 /* Scale down Y[] by 2 to avoid overflow */ |
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70 |
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71 for (i = 0; i < L_SUBFR; i++) |
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72 { |
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73 scal_y2[i] = shr (y2[i], 1); move16 (); |
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74 } |
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75 |
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76 /* Compute scalar product <X[],Y[]> */ |
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77 |
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78 s = 1L; move32 (); /* Avoid case of all zeros */ |
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79 for (i = 0; i < L_SUBFR; i++) |
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80 { |
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81 s = L_mac (s, xn2[i], scal_y2[i]); |
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82 } |
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83 exp_xy = norm_l (s); |
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84 xy = extract_h (L_shl (s, exp_xy)); |
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85 |
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86 /* If (xy < 0) gain = 0 */ |
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87 |
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88 test (); |
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89 if (xy <= 0) |
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90 return ((Word16) 0); |
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91 |
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92 /* Compute scalar product <Y[],Y[]> */ |
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93 |
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94 s = 0L; move32 (); |
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95 for (i = 0; i < L_SUBFR; i++) |
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96 { |
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97 s = L_mac (s, scal_y2[i], scal_y2[i]); |
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98 } |
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99 exp_yy = norm_l (s); |
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100 yy = extract_h (L_shl (s, exp_yy)); |
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101 |
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102 /* compute gain = xy/yy */ |
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103 |
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104 xy = shr (xy, 1); /* Be sure xy < yy */ |
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105 gain = div_s (xy, yy); |
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106 |
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107 /* Denormalization of division */ |
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108 i = add (exp_xy, 5); /* 15-1+9-18 = 5 */ |
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109 i = sub (i, exp_yy); |
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110 |
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111 gain = shl (shr (gain, i), 1); /* Q0 -> Q1 */ |
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112 |
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113 return (gain); |
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114 } |