vbap_speakers.h

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/*
 * Copyright (C) 2011-2015 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 __libardour_vbap_speakers_h__
#define __libardour_vbap_speakers_h__
 
#include <string>
#include <vector>
 
#include <pbd/signals.h>
 
#include "ardour/panner.h"
#include "ardour/speakers.h"
 
namespace ARDOUR
{
class Speakers;
 
class VBAPSpeakers
{
public:
        VBAPSpeakers (std::shared_ptr<Speakers>);
        VBAPSpeakers (const VBAPSpeakers&) = delete;
        VBAPSpeakers& operator= (const VBAPSpeakers&) = delete;
 
        typedef std::vector<double> dvector;
 
        const dvector matrix (int tuple) const
        {
                return _matrices[tuple];
        }
 
        int speaker_for_tuple (int tuple, int which) const
        {
                return _speaker_tuples[tuple][which];
        }
 
        int n_tuples () const
        {
                return _matrices.size ();
        }
 
        int dimension () const
        {
                return _dimension;
        }
 
        uint32_t n_speakers () const
        {
                return _speakers.size ();
        }
 
        std::shared_ptr<Speakers> parent () const
        {
                return _parent;
        }
 
        ~VBAPSpeakers ();
 
private:
        static const double         MIN_VOL_P_SIDE_LGTH;
        int                         _dimension;
        std::shared_ptr<Speakers> _parent;
        std::vector<Speaker>        _speakers;
        PBD::ScopedConnection       speaker_connection;
 
        struct azimuth_sorter {
                bool operator() (const Speaker& s1, const Speaker& s2)
                {
                        return s1.angles ().azi < s2.angles ().azi;
                }
        };
 
        struct twoDmatrix : public dvector {
                twoDmatrix () : dvector (4, 0.0) { }
        };
 
        struct threeDmatrix : public dvector {
                threeDmatrix () : dvector (9, 0.0) { }
        };
 
        struct tmatrix : public dvector {
                tmatrix () : dvector (3, 0.0) { }
        };
 
        std::vector<dvector> _matrices;       /* holds matrices for a given speaker combinations */
        std::vector<tmatrix> _speaker_tuples; /* holds speakers IDs for a given combination */
 
        /* A struct for all loudspeakers */
        struct ls_triplet_chain {
                int                      ls_nos[3];
                float                    inv_mx[9];
                struct ls_triplet_chain* next;
        };
 
        static double vec_angle (PBD::CartesianVector v1, PBD::CartesianVector v2);
        static double vec_length (PBD::CartesianVector v1);
        static double vec_prod (PBD::CartesianVector v1, PBD::CartesianVector v2);
        static double vol_p_side_lgth (int i, int j, int k, const std::vector<Speaker>&);
        static void   cross_prod (PBD::CartesianVector v1, PBD::CartesianVector v2, PBD::CartesianVector* res);
 
        void update ();
        int  any_ls_inside_triplet (int a, int b, int c);
        void add_ldsp_triplet (int i, int j, int k, struct ls_triplet_chain** ls_triplets);
        int  lines_intersect (int i, int j, int k, int l);
        void calculate_3x3_matrixes (struct ls_triplet_chain* ls_triplets);
        void choose_speaker_triplets (struct ls_triplet_chain** ls_triplets);
        void choose_speaker_pairs ();
        void sort_2D_lss (int* sorted_lss);
        int  calc_2D_inv_tmatrix (double azi1, double azi2, double* inv_mat);
};
 
} // namespace ARDOUR
 
#endif /* __libardour_vbap_speakers_h__ */