/usr/include/SndObj/FFT_alt.h is in libsndobj-dev 2.6.7+ds1-1.
This file is owned by root:root, with mode 0o644.
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////////////////////////////////////////////////////////////////////////
// This file is part of the SndObj library
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
//////////////////////////////////////////////////////
// FFT_alternative.h : a self-contained alternative
// to the FFT class, not using FFTW, using its own
// FFT functions. Slower, but independent,
// Victor Lazzarini, 2003
/////////////////////////////////////////////////////////
#ifndef _FFT_H
#define _FFT_H
#include "SndObj.h"
#include "Table.h"
class FFT : public SndObj {
protected:
// m_vecsize is FFT size
// m_hopsize should always be set to the time-domain
// vector size
int m_fftsize;
int m_hopsize; // hopsize
int m_halfsize; // 1/2 fftsize
int *m_counter; // counter
rfftw_plan m_plan; // FFTW initialisation
float m_scale; // scaling factor
float m_norm; // norm factor
int m_frames; // frame overlaps
float** m_sigframe; // signal frames
float* m_ffttmp; // tmp vector for fft transform
int m_cur; // index into current frame
Table* m_table; // window
// fft wrapper method
void inline fft(float* signal);
// reset memory and initialisation
void ReInit();
void rfft(float* x, int N, int forward);
public:
FFT();
FFT(Table* window, SndObj* input, float scale=1.f,
int fftsize=DEF_FFTSIZE, int hopsize=DEF_VECSIZE,
int vecsize=DEF_FFTSIZE,
float m_sr=DEF_SR);
~FFT();
int GetFFTSize() { return m_fftsize; }
int GetHopSize() { return m_hopsize; }
void SetWindow(Table* window){ m_table = window;}
int Connect(char* mess, void* input);
int Set(char* mess, float value);
void SetScale(float scale){ m_scale = scale; m_norm = m_fftsize/m_scale;}
virtual void SetFFTSize(int fftsize);
virtual void SetHopSize(int hopsize);
short DoProcess();
};
#endif
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