Clip.h

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/*
        Clip.h
        
        Copyright 2004-5 Tim Goetze <tim@quitte.de>
        
        http://quitte.de/dsp/
 
        oversampled hard ('diode', 'transistor', sometimes 'op-amp') clipper.
 
*/
/*
        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 or point your web browser to http://www.gnu.org.
*/
 
#ifndef _CLIP_H_
#define _CLIP_H_
 
#include "dsp/util.h"
#include "dsp/FIR.h"
#include "dsp/sinc.h"
#include "dsp/windows.h"
 
class Clip
: public Plugin
{
        public:
                sample_t gain, gain_db;
 
                sample_t threshold[2];
 
                enum {
                        OVERSAMPLE = 8,
                        FIR_SIZE = 64,
                };
 
                /* antialias filters */
                DSP::FIRUpsampler up;
                DSP::FIR down;
 
                template <sample_func_t F>
                        void one_cycle (int frames);
 
                inline sample_t clip (sample_t x);
 
        public:
                static PortInfo port_info[];
 
                Clip()
                        : up (FIR_SIZE, OVERSAMPLE), 
                                down (FIR_SIZE)
                        { }
 
                void init();
 
                void activate()
                        {
                                up.reset();
                                down.reset();
                                gain_db = *ports[1];
                                gain = DSP::db2lin (gain_db);
                        }
 
                void run (int n)
                        {
                                one_cycle<store_func> (n);
                        }
                
                void run_adding (int n)
                        {
                                one_cycle<adding_func> (n);
                        }
};
 
#endif /* _CLIP_H_ */