/usr/include/SndObj/IFFT_alt.h is in libsndobj-dev 2.6.6.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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
//
////////////////////////////////////////////////////////
// IFFT_alternative.cpp : a self-contained alternative
// to the IFFT class, not using FFTW, using its own
// FFT functions. Slower, but not depending on other code.
// Victor Lazzarini, 2003
/////////////////////////////////////////////////////////
#ifndef _IFFT_H
#define _IFFT_H
#include "FFT.h"
class IFFT : public FFT {
protected:
void inline ifft(float* signal);
public:
IFFT::IFFT();
IFFT::IFFT(Table* window, SndObj* input, int fftsize = DEF_FFTSIZE,
int hopsize=DEF_VECSIZE, int vecsize = DEF_VECSIZE, float sr=DEF_SR);
IFFT::~IFFT();
short DoProcess();
};
#endif
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