panner_2in2out.h

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/*
 * Copyright (C) 2011-2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2011-2017 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef __ardour_panner_2in2out_h__
#define __ardour_panner_2in2out_h__
 
#include <cassert>
#include <cmath>
#include <iostream>
#include <string>
#include <vector>
 
#include "pbd/cartesian.h"
#include "pbd/controllable.h"
#include "pbd/stateful.h"
 
#include "ardour/automatable.h"
#include "ardour/automation_control.h"
#include "ardour/panner.h"
#include "ardour/types.h"
 
namespace ARDOUR
{
class Panner2in2out : public Panner
{
public:
        Panner2in2out (std::shared_ptr<Pannable>);
        ~Panner2in2out ();
 
        ChanCount in () const
        {
                return ChanCount (DataType::AUDIO, 2);
        }
        ChanCount out () const
        {
                return ChanCount (DataType::AUDIO, 2);
        }
 
        bool clamp_position (double&);
        bool clamp_width (double&);
 
        std::pair<double, double> position_range () const;
        std::pair<double, double> width_range () const;
 
        void set_position (double);
        void set_width (double);
 
        double position () const;
        double width () const;
 
        static Panner* factory (std::shared_ptr<Pannable>, std::shared_ptr<Speakers>);
 
        std::string value_as_string (std::shared_ptr<const AutomationControl>) const;
 
        XMLNode& get_state () const;
 
        void update ();
 
        void reset ();
        void thaw ();
 
protected:
        float left[2];
        float right[2];
        float desired_left[2];
        float desired_right[2];
        float left_interp[2];
        float right_interp[2];
 
private:
        bool clamp_stereo_pan (double& direction_as_lr_fract, double& width);
 
        void distribute_one (AudioBuffer& srcbuf, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes, uint32_t which);
        void distribute_one_automated (AudioBuffer& srcbuf, BufferSet& obufs,
                                       samplepos_t start, samplepos_t end, pframes_t nframes,
                                       pan_t** buffers, uint32_t which);
};
 
} // namespace ARDOUR
 
#endif /* __ardour_panner_2in2out_h__ */