| [767] | 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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