FourierTransform.hxx

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00001 /*
00002  * Copyright (c) 2001-2006 MUSIC TECHNOLOGY GROUP (MTG)
00003  *                         UNIVERSITAT POMPEU FABRA
00004  *
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU General Public License
00017  * along with this program; if not, write to the Free Software
00018  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00019  *
00020  */
00021 
00022 #ifndef FourierTransform_hxx
00023 #define FourierTransform_hxx
00024 #include <vector>
00025 #if USE_FFTW3
00026 #include <fftw3.h>
00027 #endif
00028 
00029 class FourierTransform {
00030         std::vector<double> _spectrum;
00031         unsigned long mFrameSize;
00032         bool mIsComplex;
00033 #if USE_FFTW3
00034         double * _realInput;
00035         fftw_complex * _complexOutput;
00036         fftw_plan _plan;
00037 #endif
00038 public:
00039         FourierTransform(unsigned long int frameSize, double normalizationFactor, bool isComplex);
00040         ~FourierTransform();
00041 
00042         void doIt(const float * input);
00043         void doIt(const double * input);
00044         const std::vector<double> & spectrum() const {return _spectrum;};
00045 private:
00046         template <typename T> void doItGeneric(const T * input);
00047 };
00048 
00049 #endif//FourierTransform_hxx
00050