FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/g_pitch.c @ 61:a18782a7d270
libgsmefr: d_gains.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 25 Nov 2022 20:19:30 +0000 |
parents | 49dd1ac8e75b |
children | d9229fdac1c7 |
rev | line source |
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: G_pitch |
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4 * |
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5 * PURPOSE: Compute the pitch (adaptive codebook) gain. Result in Q12 |
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6 * |
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7 * DESCRIPTION: |
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8 * The adaptive codebook gain is given by |
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9 * |
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10 * g = <x[], y[]> / <y[], y[]> |
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11 * |
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12 * where x[] is the target vector, y[] is the filtered adaptive |
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13 * codevector, and <> denotes dot product. |
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14 * The gain is limited to the range [0,1.2] |
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15 * |
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16 *************************************************************************/ |
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17 |
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18 #include "typedef.h" |
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19 #include "basic_op.h" |
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20 #include "oper_32b.h" |
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21 #include "count.h" |
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22 #include "sig_proc.h" |
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23 |
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24 Word16 G_pitch ( /* (o) : Gain of pitch lag saturated to 1.2 */ |
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25 Word16 xn[], /* (i) : Pitch target. */ |
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26 Word16 y1[], /* (i) : Filtered adaptive codebook. */ |
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27 Word16 L_subfr /* : Length of subframe. */ |
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28 ) |
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29 { |
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30 Word16 i; |
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31 Word16 xy, yy, exp_xy, exp_yy, gain; |
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32 Word32 s; |
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33 |
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34 Word16 scaled_y1[80]; /* Usually dynamic allocation of (L_subfr) */ |
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35 |
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36 /* divide by 2 "y1[]" to avoid overflow */ |
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37 |
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38 for (i = 0; i < L_subfr; i++) |
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39 { |
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40 scaled_y1[i] = shr (y1[i], 2); move16 (); |
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41 } |
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42 |
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43 /* Compute scalar product <y1[],y1[]> */ |
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44 |
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45 s = 0L; move32 (); /* Avoid case of all zeros */ |
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46 for (i = 0; i < L_subfr; i++) |
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47 { |
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48 s = L_mac (s, y1[i], y1[i]); |
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49 } |
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50 test (); |
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51 if (L_sub (s, MAX_32) != 0L) /* Test for overflow */ |
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52 { |
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53 s = L_add (s, 1L); /* Avoid case of all zeros */ |
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54 exp_yy = norm_l (s); |
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55 yy = round (L_shl (s, exp_yy)); |
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56 } |
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57 else |
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58 { |
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59 s = 1L; move32 (); /* Avoid case of all zeros */ |
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60 for (i = 0; i < L_subfr; i++) |
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61 { |
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62 s = L_mac (s, scaled_y1[i], scaled_y1[i]); |
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63 } |
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64 exp_yy = norm_l (s); |
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65 yy = round (L_shl (s, exp_yy)); |
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66 exp_yy = sub (exp_yy, 4); |
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67 } |
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68 |
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69 /* Compute scalar product <xn[],y1[]> */ |
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70 |
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71 Overflow = 0; move16 (); |
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72 s = 1L; move32 (); /* Avoid case of all zeros */ |
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73 for (i = 0; i < L_subfr; i++) |
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74 { |
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75 Carry = 0; move16 (); |
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76 s = L_macNs (s, xn[i], y1[i]); |
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77 |
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78 test (); |
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79 if (Overflow != 0) |
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80 { |
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81 break; |
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82 } |
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83 } |
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84 test (); |
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85 if (Overflow == 0) |
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86 { |
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87 exp_xy = norm_l (s); |
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88 xy = round (L_shl (s, exp_xy)); |
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89 } |
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90 else |
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91 { |
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92 s = 1L; move32 (); /* Avoid case of all zeros */ |
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93 for (i = 0; i < L_subfr; i++) |
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94 { |
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95 s = L_mac (s, xn[i], scaled_y1[i]); |
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96 } |
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97 exp_xy = norm_l (s); |
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98 xy = round (L_shl (s, exp_xy)); |
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99 exp_xy = sub (exp_xy, 2); |
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100 } |
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101 |
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102 /* If (xy < 4) gain = 0 */ |
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103 |
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104 i = sub (xy, 4); |
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105 |
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106 test (); |
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107 if (i < 0) |
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108 return ((Word16) 0); |
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109 |
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110 /* compute gain = xy/yy */ |
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111 |
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112 xy = shr (xy, 1); /* Be sure xy < yy */ |
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113 gain = div_s (xy, yy); |
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114 |
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115 i = add (exp_xy, 3 - 1); /* Denormalization of division */ |
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116 i = sub (i, exp_yy); |
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117 |
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118 gain = shr (gain, i); |
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119 |
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120 /* if(gain >1.2) gain = 1.2 */ |
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121 |
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122 test (); |
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123 if (sub (gain, 4915) > 0) |
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124 { |
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125 gain = 4915; move16 (); |
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126 } |
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127 return (gain); |
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128 } |