timidity_filter.h

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/*

    TiMidity -- Experimental MIDI to WAVE converter
    Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

   filter.h : written by Vincent Pagel ( pagel@loria.fr )

   implements fir antialiasing filter : should help when setting sample
   rates as low as 8Khz.

   */

#ifdef USE_TIMIDITY_MIDI

#ifndef TIMIDITY_FILTER_H_INCLUDED
#define TIMIDITY_FILTER_H_INCLUDED

#include "timidity.h"

#ifdef NS_TIMIDITY
namespace NS_TIMIDITY {
#endif

/* Order of the FIR filter = 20 should be enough ! */
#define ORDER 20
#define ORDER2 ORDER/2

#ifndef PI
#define PI   3.14159265
#endif

extern void antialiasing(Sample *sp, sint32 output_rate);

#ifdef NS_TIMIDITY
};
#endif

#endif

#endif //USE_TIMIDITY_MIDI

---