/usr/include/SndObj/PVS.h is in libsndobj-dev 2.6.7+ds1-1.
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
//////////////////////////////////////////////////////
// PVS.h: Phase Vocoder Synthesis Class
//
// Victor Lazzarini, 2003
//
/////////////////////////////////////////////////////////
#ifndef _PVS_H
#define _PVS_H
#include "IFFT.h"
class PVS : public IFFT {
protected:
int m_rotcount; // rotation counter
float m_factor; // conversion factor
float* m_phases; // old phases
private:
void inline pvsynthesis(float* signal);
bool m_first;
public:
PVS();
PVS(Table* window, SndObj* input, int fftsize=DEF_FFTSIZE,
int hopsize=DEF_VECSIZE, float sr=DEF_SR);
~PVS();
int Set(char* mess, float value);
void SetFFTSize(int fftsize);
void SetHopSize(int hopsize);
short DoProcess();
};
#endif
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