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1 /***************************************************************************** |
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2 |
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3 FFTReal.h |
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4 Copyright (c) 2005 Laurent de Soras |
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5 |
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6 --- Legal stuff --- |
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7 |
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8 This library is free software; you can redistribute it and/or |
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9 modify it under the terms of the GNU Lesser General Public |
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10 License as published by the Free Software Foundation; either |
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11 version 2.1 of the License, or (at your option) any later version. |
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12 |
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13 This library is distributed in the hope that it will be useful, |
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 Lesser General Public License for more details. |
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17 |
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18 You should have received a copy of the GNU Lesser General Public |
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19 License along with this library; if not, write to the Free Software |
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20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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21 |
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22 *Tab=3***********************************************************************/ |
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23 |
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24 |
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25 |
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26 #if ! defined (FFTReal_HEADER_INCLUDED) |
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27 #define FFTReal_HEADER_INCLUDED |
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28 |
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29 #if defined (_MSC_VER) |
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30 #pragma once |
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31 #pragma warning (4 : 4250) // "Inherits via dominance." |
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32 #endif |
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33 |
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34 |
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35 |
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36 /*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ |
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37 |
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38 #include "def.h" |
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39 #include "DynArray.h" |
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40 #include "OscSinCos.h" |
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41 |
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42 |
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43 |
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44 template <class DT> |
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45 class FFTReal |
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46 { |
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47 |
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48 /*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ |
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49 |
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50 public: |
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51 |
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52 enum { MAX_BIT_DEPTH = 30 }; // So length can be represented as long int |
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53 |
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54 typedef DT DataType; |
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55 |
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56 explicit FFTReal (long length); |
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57 virtual ~FFTReal () {} |
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58 |
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59 long get_length () const; |
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60 void do_fft (DataType f [], const DataType x []) const; |
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61 void do_ifft (const DataType f [], DataType x []) const; |
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62 void rescale (DataType x []) const; |
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63 DataType * use_buffer () const; |
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64 |
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65 |
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66 |
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67 /*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ |
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68 |
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69 protected: |
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70 |
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71 |
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72 |
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73 /*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ |
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74 |
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75 private: |
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76 |
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77 // Over this bit depth, we use direct calculation for sin/cos |
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78 enum { TRIGO_BD_LIMIT = 12 }; |
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79 |
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80 typedef OscSinCos <DataType> OscType; |
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81 |
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82 void init_br_lut (); |
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83 void init_trigo_lut (); |
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84 void init_trigo_osc (); |
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85 |
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86 FORCEINLINE const long * |
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87 get_br_ptr () const; |
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88 FORCEINLINE const DataType * |
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89 get_trigo_ptr (int level) const; |
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90 FORCEINLINE long |
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91 get_trigo_level_index (int level) const; |
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92 |
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93 inline void compute_fft_general (DataType f [], const DataType x []) const; |
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94 inline void compute_direct_pass_1_2 (DataType df [], const DataType x []) const; |
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95 inline void compute_direct_pass_3 (DataType df [], const DataType sf []) const; |
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96 inline void compute_direct_pass_n (DataType df [], const DataType sf [], int pass) const; |
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97 inline void compute_direct_pass_n_lut (DataType df [], const DataType sf [], int pass) const; |
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98 inline void compute_direct_pass_n_osc (DataType df [], const DataType sf [], int pass) const; |
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99 |
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100 inline void compute_ifft_general (const DataType f [], DataType x []) const; |
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101 inline void compute_inverse_pass_n (DataType df [], const DataType sf [], int pass) const; |
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102 inline void compute_inverse_pass_n_osc (DataType df [], const DataType sf [], int pass) const; |
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103 inline void compute_inverse_pass_n_lut (DataType df [], const DataType sf [], int pass) const; |
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104 inline void compute_inverse_pass_3 (DataType df [], const DataType sf []) const; |
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105 inline void compute_inverse_pass_1_2 (DataType x [], const DataType sf []) const; |
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106 |
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107 const long _length; |
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108 const int _nbr_bits; |
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109 DynArray <long> |
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110 _br_lut; |
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111 DynArray <DataType> |
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112 _trigo_lut; |
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113 mutable DynArray <DataType> |
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114 _buffer; |
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115 mutable DynArray <OscType> |
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116 _trigo_osc; |
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117 |
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118 |
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119 |
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120 /*\\\ FORBIDDEN MEMBER FUNCTIONS \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ |
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121 |
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122 private: |
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123 |
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124 FFTReal (); |
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125 FFTReal (const FFTReal &other); |
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126 FFTReal & operator = (const FFTReal &other); |
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127 bool operator == (const FFTReal &other); |
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128 bool operator != (const FFTReal &other); |
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129 |
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130 }; // class FFTReal |
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131 |
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132 |
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133 |
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134 #include "FFTReal.hpp" |
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135 |
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136 |
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137 |
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138 #endif // FFTReal_HEADER_INCLUDED |
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139 |
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140 |
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141 |
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142 /*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ |