FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/hp_max.c @ 435:9f354d2aea13
efrtest: split etsi-dec.c for code reuse
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 08 May 2024 05:25:47 +0000 |
parents | 176a44ff94a1 |
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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 : hp_max.c |
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11 * Purpose : Find the maximum correlation of scal_sig[] in a given |
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12 * delay range. |
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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 ******************************************************************************** |
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19 * MODULE INCLUDE FILE AND VERSION ID |
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20 ******************************************************************************** |
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21 */ |
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22 #include "namespace.h" |
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23 #include "hp_max.h" |
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24 |
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25 /* |
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26 ******************************************************************************** |
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27 * INCLUDE FILES |
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28 ******************************************************************************** |
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29 */ |
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30 #include "typedef.h" |
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31 #include "basic_op.h" |
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32 #include "oper_32b.h" |
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33 #include "no_count.h" |
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34 #include "cnst.h" |
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35 |
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36 /* |
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37 ******************************************************************************** |
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38 * PUBLIC PROGRAM CODE |
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39 ******************************************************************************** |
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40 */ |
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41 Word16 hp_max ( |
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42 Word32 corr[], /* i : correlation vector. */ |
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43 Word16 scal_sig[], /* i : scaled signal. */ |
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44 Word16 L_frame, /* i : length of frame to compute pitch */ |
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45 Word16 lag_max, /* i : maximum lag */ |
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46 Word16 lag_min, /* i : minimum lag */ |
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47 Word16 *cor_hp_max) /* o : max high-pass filtered norm. correlation */ |
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48 { |
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49 Word16 i; |
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50 Word16 *p, *p1; |
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51 Word32 max, t0, t1; |
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52 Word16 max16, t016, cor_max; |
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53 Word16 shift, shift1, shift2; |
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54 |
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55 max = MIN_32; move32 (); |
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56 t0 = 0L; move32 (); |
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57 |
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58 for (i = lag_max-1; i > lag_min; i--) |
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59 { |
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60 /* high-pass filtering */ |
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61 t0 = L_sub (L_sub(L_shl(corr[-i], 1), corr[-i-1]), corr[-i+1]); |
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62 t0 = L_abs (t0); |
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63 |
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64 test (); |
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65 if (L_sub (t0, max) >= 0) |
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66 { |
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67 max = t0; move32 (); |
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68 } |
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69 } |
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70 |
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71 /* compute energy */ |
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72 p = scal_sig; move16 (); |
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73 p1 = &scal_sig[0]; move16 (); |
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74 t0 = 0L; move32 (); |
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75 for (i = 0; i < L_frame; i++, p++, p1++) |
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76 { |
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77 t0 = L_mac (t0, *p, *p1); |
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78 } |
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79 |
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80 p = scal_sig; move16 (); |
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81 p1 = &scal_sig[-1]; move16 (); |
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82 t1 = 0L; move32 (); |
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83 for (i = 0; i < L_frame; i++, p++, p1++) |
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84 { |
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85 t1 = L_mac (t1, *p, *p1); |
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86 } |
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87 |
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88 /* high-pass filtering */ |
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89 t0 = L_sub(L_shl(t0, 1), L_shl(t1, 1)); |
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90 t0 = L_abs (t0); |
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91 |
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92 /* max/t0 */ |
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93 shift1 = sub(norm_l(max), 1); |
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94 max16 = extract_h(L_shl(max, shift1)); |
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95 shift2 = norm_l(t0); |
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96 t016 = extract_h(L_shl(t0, shift2)); |
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97 |
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98 test (); |
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99 if (t016 != 0) |
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100 { |
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101 cor_max = div_s(max16, t016); |
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102 } |
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103 else |
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104 { |
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105 cor_max = 0; move16 (); |
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106 } |
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107 |
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108 shift = sub(shift1, shift2); |
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109 |
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110 test (); |
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111 if (shift >= 0) |
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112 { |
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113 *cor_hp_max = shr(cor_max, shift); move16 (); /* Q15 */ |
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114 } |
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115 else |
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116 { |
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117 *cor_hp_max = shl(cor_max, negate(shift)); move16 (); /* Q15 */ |
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118 } |
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119 |
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120 return 0; |
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|
121 } |