/usr/include/SndObj/Convol.h is in libsndobj-dev 2.6.6.1-5.
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
//
// Copyright (c)Victor Lazzarini, 1997-2004
// See License.txt for a disclaimer of all warranties
// and licensing information
///////////////////////////////////////////////
// Convol.h: Fast convolution using a tabulated
// impulse response
//
// VL, 2003
/////////////////////////////////////////////
#ifndef _CONVOL_H
#define _CONVOL_H
#include "SndObj.h"
#include "Table.h"
#include <rfftw/rfftw.h>
class Convol: public SndObj {
protected:
Table* m_table;
float* m_impulse;
float* m_sigframe;
float* m_outframe;
float* m_overlap;
int m_L;
int m_count;
int m_fftsize;
float m_scale;
rfftw_plan m_fwd;
rfftw_plan m_inv;
void inline mult(float* a, float* b, float* res);
void inline fft(float* in, float* out);
void inline ifft(float* in, float* out);
public:
// constructors / destructor
Convol();
Convol(Table* impulse, SndObj* input, float scale=1.f,
int vecsize=DEF_VECSIZE, float sr=DEF_SR);
~Convol();
int Connect(char* mess, void* input);
int Set(char* mess, float value);
void SetImpulse(Table* impulse, float scale);
short DoProcess();
};
#endif
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