Pan.h

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/*
        Pan.h
        
        Copyright 2004-11 Tim Goetze <tim@quitte.de>
        
        http://quitte.de/dsp/
 
        panorama with width control, 
        stereo image width reduction
 
*/
/*
        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 _PAN_H_
#define _PAN_H_
 
#include "dsp/Delay.h"
#include "dsp/OnePole.h"
 
class PanTap
{
        public:
                int t;
                DSP::OnePoleLP damper;
 
                sample_t get (DSP::Delay & delay)
                        {
                                return damper.process (delay[t]);
                        }
 
                void reset (double c)
                        {
                                damper.set_f (c);
                                damper.reset();
                        }
};
 
class Pan
: public Plugin
{
        public:
                sample_t pan;
 
                sample_t gain_l, gain_r;
 
                DSP::Delay delay;
                PanTap tap;
 
                template <sample_func_t F>
                        void one_cycle (int frames);
 
                inline void set_pan (sample_t);
 
        public:
                static PortInfo port_info [];
 
                void init();
                void activate();
 
                void run (int n)
                        {
                                one_cycle<store_func> (n);
                        }
                
                void run_adding (int n)
                        {
                                one_cycle<adding_func> (n);
                        }
};
 
/* stereo width reduction */
class Narrower
: public Plugin
{
        public:
                sample_t strength;
 
                template <sample_func_t F>
                        void one_cycle (int frames);
 
        public:
                static PortInfo port_info [];
 
                void init();
                void activate();
 
                void run (int n)
                        {
                                one_cycle<store_func> (n);
                        }
                
                void run_adding (int n)
                        {
                                one_cycle<adding_func> (n);
                        }
 
};
 
#endif /* _PAN_H_ */