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158 lines
3.7 KiB
C++
158 lines
3.7 KiB
C++
/* meter.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2013 Warren Pratt, NR0V
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Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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*/
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#include "comm.hpp"
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#include "meterlog10.hpp"
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#include "meter.hpp"
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namespace WDSP {
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void METER::calc()
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{
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mult_average = exp(-1.0 / (rate * tau_average));
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mult_peak = exp(-1.0 / (rate * tau_peak_decay));
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flush();
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}
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METER::METER(
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int _run,
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int* _prun,
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int _size,
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float* _buff,
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int _rate,
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double _tau_av,
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double _tau_decay,
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double* _result,
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int _enum_av,
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int _enum_pk,
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int _enum_gain,
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double* _pgain
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) :
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run(_run),
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prun(_prun),
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size(_size),
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buff(_buff),
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rate((double) _rate),
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tau_average(_tau_av),
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tau_peak_decay(_tau_decay),
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result(_result),
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enum_av(_enum_av),
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enum_pk(_enum_pk),
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enum_gain(_enum_gain),
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pgain(_pgain)
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{
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calc();
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}
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void METER::flush()
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{
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avg = 0.0;
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peak = 0.0;
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result[enum_av] = -100.0;
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result[enum_pk] = -100.0;
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if ((pgain != nullptr) && (enum_gain >= 0))
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result[enum_gain] = 0.0;
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}
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void METER::execute()
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{
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int srun;
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if (prun != nullptr)
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srun = *prun;
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else
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srun = 1;
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if (run && srun)
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{
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double smag;
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double np = 0.0;
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for (int i = 0; i < size; i++)
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{
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double xr = buff[2 * i + 0];
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double xi = buff[2 * i + 1];
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smag = xr*xr + xi*xi;
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avg = avg * mult_average + (1.0 - mult_average) * smag;
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peak *= mult_peak;
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if (smag > np)
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np = smag;
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}
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if (np > peak)
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peak = np;
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result[enum_av] = 10.0 * MemLog::mlog10 (avg <= 0 ? 1.0e-20 : avg);
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result[enum_pk] = 10.0 * MemLog::mlog10 (peak <= 0 ? 1.0e-20 : peak);
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if ((pgain != nullptr) && (enum_gain >= 0))
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result[enum_gain] = 20.0 * MemLog::mlog10 (*pgain <= 0 ? 1.0e-20 : *pgain);
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}
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else
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{
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if (enum_av >= 0)
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result[enum_av] = -100.0;
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if (enum_pk >= 0)
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result[enum_pk] = -100.0;
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if (enum_gain >= 0)
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result[enum_gain] = 0.0;
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}
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}
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void METER::setBuffers(float* in)
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{
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buff = in;
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flush();
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}
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void METER::setSamplerate(int _rate)
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{
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rate = (double) _rate;
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calc();
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}
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void METER::setSize(int _size)
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{
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size = _size;
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flush();
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}
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/********************************************************************************************************
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* *
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* Public Properties *
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* *
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********************************************************************************************************/
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double METER::getMeter(int mt) const
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{
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return result[mt];
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}
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} // namespace WDSP
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