FFTReal.h Example File

multimedia/spectrum/3rdparty/fftreal/FFTReal.h
/***************************************************************************** FFTReal.h Copyright (c) 2005 Laurent de Soras --- Legal stuff --- This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *Tab=3***********************************************************************/
#if ! defined (FFTReal_HEADER_INCLUDED) #define FFTReal_HEADER_INCLUDED #if defined (_MSC_VER) #pragma once #pragma warning (4 : 4250) // "Inherits via dominance." #endif /*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ #include "def.h" #include "DynArray.h" #include "OscSinCos.h" template <class DT> class FFTReal { /*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ public: enum { MAX_BIT_DEPTH = 30 }; // So length can be represented as long int typedef DT DataType; explicit FFTReal (long length); virtual ~FFTReal () {} long get_length () const; void do_fft (DataType f [], const DataType x []) const; void do_ifft (const DataType f [], DataType x []) const; void rescale (DataType x []) const; DataType * use_buffer () const; /*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ protected: /*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ private: // Over this bit depth, we use direct calculation for sin/cos enum { TRIGO_BD_LIMIT = 12 }; typedef OscSinCos <DataType> OscType; void init_br_lut (); void init_trigo_lut (); void init_trigo_osc (); FORCEINLINE const long * get_br_ptr () const; FORCEINLINE const DataType * get_trigo_ptr (int level) const; FORCEINLINE long get_trigo_level_index (int level) const; inline void compute_fft_general (DataType f [], const DataType x []) const; inline void compute_direct_pass_1_2 (DataType df [], const DataType x []) const; inline void compute_direct_pass_3 (DataType df [], const DataType sf []) const; inline void compute_direct_pass_n (DataType df [], const DataType sf [], int pass) const; inline void compute_direct_pass_n_lut (DataType df [], const DataType sf [], int pass) const; inline void compute_direct_pass_n_osc (DataType df [], const DataType sf [], int pass) const; inline void compute_ifft_general (const DataType f [], DataType x []) const; inline void compute_inverse_pass_n (DataType df [], const DataType sf [], int pass) const; inline void compute_inverse_pass_n_osc (DataType df [], const DataType sf [], int pass) const; inline void compute_inverse_pass_n_lut (DataType df [], const DataType sf [], int pass) const; inline void compute_inverse_pass_3 (DataType df [], const DataType sf []) const; inline void compute_inverse_pass_1_2 (DataType x [], const DataType sf []) const; const long _length; const int _nbr_bits; DynArray <long> _br_lut; DynArray <DataType> _trigo_lut; mutable DynArray <DataType> _buffer; mutable DynArray <OscType> _trigo_osc; /*\\\ FORBIDDEN MEMBER FUNCTIONS \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ private: FFTReal (); FFTReal (const FFTReal &other); FFTReal & operator = (const FFTReal &other); bool operator == (const FFTReal &other); bool operator != (const FFTReal &other); }; // class FFTReal #include "FFTReal.hpp" #endif // FFTReal_HEADER_INCLUDED /*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/

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