/usr/include/SndObj/Ap.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
//************************************************************//
// Ap.h: interface of the Ap class (2nd order //
// butterworth band-pass filter). //
// //
// //
//************************************************************//
#ifndef _AP_H
#define _AP_H
#include "TpTz.h"
class Ap: public TpTz
{
protected:
void inline SetAPParams(float fr, float R);
SndObj* m_inputR;
SndObj* m_inputfr;
public:
Ap();
Ap(float fr, float R, SndObj* inObj, SndObj* inputfreq = 0,
SndObj* inputR=0, int vecsize=DEF_VECSIZE, float sr=DEF_SR);
~Ap();
void SetFreq(float fr, SndObj* InFrObj);
void SetR(float r, SndObj* InRObj=0);
void SetSr(float sr){
m_sr = sr;
SetAPParams(m_fr, m_bw);
}
int Set(char* mess, float value);
int Connect(char* mess, void* input);
short DoProcess();
char* ErrorMessage();
};
void
Ap::SetAPParams(float fr, float R){
R= 1.f/R;
double thecos = cos((2*PI*fr)/m_sr);
m_a1 = -2*R*thecos;
m_a2 = R*R;
m_b1 = (-2/R)*thecos;
m_b2 = 1/m_a2;
m_a = 1;
}
#endif
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