sdrangel/plugins/channelrx/demoddatv/datvconstellation.h

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2018 F4HKW                                                      //
// for F4EXB / SDRAngel                                                          //
// using LeanSDR Framework (C) 2016 F4DAV                                        //
//                                                                               //
// 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 as version 3 of the License, or                  //
//                                                                               //
// 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 V3 for more details.                               //
//                                                                               //
// You should have received a copy of the GNU General Public License             //
// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
///////////////////////////////////////////////////////////////////////////////////

#ifndef DATVCONSTELLATION_H
#define DATVCONSTELLATION_H

#include <sys/time.h>
#include <vector>

#include "leansdr/framework.h"
#include "gui/tvscreen.h"

namespace leansdr
{

static const int DEFAULT_GUI_DECIMATION = 64;

template<typename T> struct datvconstellation: runnable
{
    T xymin, xymax;
    unsigned long decimation;
    unsigned long pixels_per_frame;
    cstln_lut<256> **cstln;  // Optional ptr to optional constellation
    TVScreen *m_objDATVScreen;
    pipereader<complex<T> > in;
    unsigned long phase;
    std::vector<int> cstln_rows;
    std::vector<int> cstln_cols;

    datvconstellation(scheduler *sch, pipebuf<complex<T> > &_in, T _xymin, T _xymax, const char *_name = 0, TVScreen *objDATVScreen = 0) :
            runnable(sch, _name ? _name : _in.name),
            xymin(_xymin),
            xymax(_xymax),
            decimation(DEFAULT_GUI_DECIMATION),
            pixels_per_frame(1024),
            cstln(0),
            m_objDATVScreen(objDATVScreen),
            in(_in),
            phase(0)
    {
    }

    void run()
    {
        //Symbols

        while (in.readable() >= pixels_per_frame)
        {
            if ((!phase) && m_objDATVScreen)
            {
                m_objDATVScreen->resetImage();

                complex<T> *p = in.rd(), *pend = p + pixels_per_frame;

                for (; p < pend; ++p)
                {
                    if (m_objDATVScreen != 0)
                    {
                        m_objDATVScreen->selectRow(256 * (p->re - xymin) / (xymax - xymin));
                        m_objDATVScreen->setDataColor(256 - 256 * ((p->im - xymin) / (xymax - xymin)), 255, 0, 255);
                    }

                }

                if (cstln && (*cstln))
                {
                    // Plot constellation points

                    std::vector<int>::const_iterator row_it = cstln_rows.begin();
                    std::vector<int>::const_iterator col_it = cstln_cols.begin();

                    for (; (row_it != cstln_rows.end()) && (col_it != cstln_cols.end()); ++row_it, ++col_it)
                    {
                        m_objDATVScreen->selectRow(*row_it);
                        m_objDATVScreen->setDataColor(*col_it, 250, 250, 5);
                    }
                }

                m_objDATVScreen->renderImage(0);
            }

            in.read(pixels_per_frame);

            if (++phase >= decimation)
            {
                phase = 0;
            }
        }
    }

    void draw_begin()
    {
    }

    void calculate_cstln_points()
    {
        if (!(*cstln)) {
            return;
        }

        cstln_rows.clear();
        cstln_cols.clear();

        for (int i = 0; i < (*cstln)->nsymbols; ++i)
        {
            complex<signed char> *p = &(*cstln)->symbols[i];
            int x = 256 * (p->re - xymin) / (xymax - xymin);
            int y = 256 - 256 * (p->im - xymin) / (xymax - xymin);

            for (int d = -4; d <= 4; ++d)
            {
                cstln_rows.push_back(x + d);
                cstln_cols.push_back(y);
                cstln_rows.push_back(x);
                cstln_cols.push_back(y + d);
            }
        }
    }
};

}

#endif // DATVCONSTELLATION_H