sdrangel/wdsp/cblock.cpp

/*  cblock.c

This file is part of a program that implements a Software-Defined Radio.

Copyright (C) 2013, 2016 Warren Pratt, NR0V
Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel

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.

The author can be reached by email at

warren@wpratt.com

*/

#include "comm.hpp"
#include "cblock.hpp"
#include "RXA.hpp"

namespace WDSP {

void CBL::calc_cbl (CBL *a)
{
    a->prevIin  = 0.0;
    a->prevQin  = 0.0;
    a->prevIout = 0.0;
    a->prevQout = 0.0;
    a->mtau = exp(-1.0 / (a->sample_rate * a->tau));
}

CBL* CBL::create_cbl(
    int run,
    int buff_size,
    float *in_buff,
    float *out_buff,
    int mode,
    int sample_rate,
    double tau
)
{
    CBL *a = new CBL;
    a->run = run;
    a->buff_size = buff_size;
    a->in_buff = in_buff;
    a->out_buff = out_buff;
    a->mode = mode;
    a->sample_rate = (double) sample_rate;
    a->tau = tau;
    calc_cbl (a);
    return a;
}

void CBL::destroy_cbl(CBL *a)
{
    delete a;
}

void CBL::flush_cbl (CBL *a)
{
    a->prevIin  = 0.0;
    a->prevQin  = 0.0;
    a->prevIout = 0.0;
    a->prevQout = 0.0;
}

void CBL::xcbl (CBL *a)
{
    if (a->run)
    {
        int i;
        double tempI, tempQ;

        for (i = 0; i < a->buff_size; i++)
        {
            tempI  = a->in_buff[2 * i + 0];
            tempQ  = a->in_buff[2 * i + 1];
            a->out_buff[2 * i + 0] = a->in_buff[2 * i + 0] - a->prevIin + a->mtau * a->prevIout;
            a->out_buff[2 * i + 1] = a->in_buff[2 * i + 1] - a->prevQin + a->mtau * a->prevQout;
            a->prevIin  = tempI;
            a->prevQin  = tempQ;

            if (fabs(a->prevIout = a->out_buff[2 * i + 0]) < 1.0e-20)
                a->prevIout = 0.0;

            if (fabs(a->prevQout = a->out_buff[2 * i + 1]) < 1.0e-20)
                a->prevQout = 0.0;
        }
    }
    else if (a->in_buff != a->out_buff)
    {
        std::copy(a->in_buff, a->in_buff + a->buff_size * 2, a->out_buff);
    }
}

void CBL::setBuffers_cbl (CBL *a, float* in, float* out)
{
    a->in_buff = in;
    a->out_buff = out;
}

void CBL::setSamplerate_cbl (CBL *a, int rate)
{
    a->sample_rate = rate;
    calc_cbl (a);
}

void CBL::setSize_cbl (CBL *a, int size)
{
    a->buff_size = size;
    flush_cbl (a);
}

/********************************************************************************************************
*                                                                                                       *
*                                           RXA Properties                                              *
*                                                                                                       *
********************************************************************************************************/

void CBL::SetCBLRun(RXA& rxa, int setit)
{
    rxa.cbl->run = setit;
}

} // namespace WDSP