FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/g_pitch.c @ 79:8d3412b7ec4e
libgsmefr: lsp_lsf.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 06:57:48 +0000 |
parents | d9229fdac1c7 |
children | 827661987b41 |
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 "gsm_efr.h" |
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19 #include "typedef.h" |
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20 #include "namespace.h" |
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21 #include "basic_op.h" |
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22 #include "oper_32b.h" |
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23 #include "no_count.h" |
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24 #include "sig_proc.h" |
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25 #include "codec.h" |
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26 |
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27 Word16 G_pitch ( /* (o) : Gain of pitch lag saturated to 1.2 */ |
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28 Word16 xn[], /* (i) : Pitch target. */ |
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29 Word16 y1[], /* (i) : Filtered adaptive codebook. */ |
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30 Word16 L_subfr /* : Length of subframe. */ |
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31 ) |
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32 { |
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33 Word16 i; |
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34 Word16 xy, yy, exp_xy, exp_yy, gain; |
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35 Word32 s; |
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36 |
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37 Word16 scaled_y1[80]; /* Usually dynamic allocation of (L_subfr) */ |
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38 |
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39 /* divide by 2 "y1[]" to avoid overflow */ |
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40 |
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41 for (i = 0; i < L_subfr; i++) |
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42 { |
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43 scaled_y1[i] = shr (y1[i], 2); move16 (); |
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44 } |
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45 |
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46 /* Compute scalar product <y1[],y1[]> */ |
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47 |
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48 s = 0L; move32 (); /* Avoid case of all zeros */ |
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49 for (i = 0; i < L_subfr; i++) |
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50 { |
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51 s = L_mac (s, y1[i], y1[i]); |
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52 } |
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53 test (); |
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54 if (L_sub (s, MAX_32) != 0L) /* Test for overflow */ |
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55 { |
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56 s = L_add (s, 1L); /* Avoid case of all zeros */ |
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57 exp_yy = norm_l (s); |
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58 yy = round (L_shl (s, exp_yy)); |
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59 } |
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60 else |
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61 { |
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62 s = 1L; move32 (); /* Avoid case of all zeros */ |
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63 for (i = 0; i < L_subfr; i++) |
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64 { |
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65 s = L_mac (s, scaled_y1[i], scaled_y1[i]); |
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66 } |
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67 exp_yy = norm_l (s); |
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68 yy = round (L_shl (s, exp_yy)); |
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69 exp_yy = sub (exp_yy, 4); |
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70 } |
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71 |
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72 /* Compute scalar product <xn[],y1[]> */ |
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73 |
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74 Overflow = 0; move16 (); |
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75 s = 1L; move32 (); /* Avoid case of all zeros */ |
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76 for (i = 0; i < L_subfr; i++) |
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77 { |
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78 Carry = 0; move16 (); |
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79 s = L_macNs (s, xn[i], y1[i]); |
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80 |
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81 test (); |
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82 if (Overflow != 0) |
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83 { |
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84 break; |
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85 } |
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86 } |
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87 test (); |
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88 if (Overflow == 0) |
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89 { |
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90 exp_xy = norm_l (s); |
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91 xy = round (L_shl (s, exp_xy)); |
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92 } |
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93 else |
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94 { |
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95 s = 1L; move32 (); /* Avoid case of all zeros */ |
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96 for (i = 0; i < L_subfr; i++) |
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97 { |
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98 s = L_mac (s, xn[i], scaled_y1[i]); |
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99 } |
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100 exp_xy = norm_l (s); |
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101 xy = round (L_shl (s, exp_xy)); |
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102 exp_xy = sub (exp_xy, 2); |
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103 } |
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104 |
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105 /* If (xy < 4) gain = 0 */ |
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106 |
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107 i = sub (xy, 4); |
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108 |
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109 test (); |
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110 if (i < 0) |
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111 return ((Word16) 0); |
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112 |
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113 /* compute gain = xy/yy */ |
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114 |
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115 xy = shr (xy, 1); /* Be sure xy < yy */ |
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116 gain = div_s (xy, yy); |
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117 |
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118 i = add (exp_xy, 3 - 1); /* Denormalization of division */ |
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119 i = sub (i, exp_yy); |
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120 |
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121 gain = shr (gain, i); |
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122 |
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123 /* if(gain >1.2) gain = 1.2 */ |
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124 |
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125 test (); |
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126 if (sub (gain, 4915) > 0) |
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127 { |
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128 gain = 4915; move16 (); |
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129 } |
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130 return (gain); |
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131 } |