160 lines
4.2 KiB
C
160 lines
4.2 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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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.h"
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void calc_meter (METER a)
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{
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a->mult_average = exp(-1.0 / (a->rate * a->tau_average));
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a->mult_peak = exp(-1.0 / (a->rate * a->tau_peak_decay));
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flush_meter(a);
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}
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METER create_meter (int run, int* prun, int size, double* buff, int rate, double tau_av, double tau_decay, double* result, CRITICAL_SECTION** pmtupdate, int enum_av, int enum_pk, int enum_gain, double* pgain)
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{
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METER a = (METER) malloc0 (sizeof (meter));
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a->run = run;
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a->prun = prun;
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a->size = size;
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a->buff = buff;
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a->rate = (double)rate;
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a->tau_average = tau_av;
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a->tau_peak_decay = tau_decay;
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a->result = result;
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a->enum_av = enum_av;
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a->enum_pk = enum_pk;
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a->enum_gain = enum_gain;
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a->pgain = pgain;
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calc_meter(a);
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InitializeCriticalSectionAndSpinCount (&a->mtupdate, 2500);
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pmtupdate[enum_av] = &a->mtupdate;
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pmtupdate[enum_pk] = &a->mtupdate;
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pmtupdate[enum_gain] = &a->mtupdate;
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return a;
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}
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void destroy_meter (METER a)
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{
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DeleteCriticalSection (&a->mtupdate);
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_aligned_free (a);
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}
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void flush_meter (METER a)
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{
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a->avg = 0.0;
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a->peak = 0.0;
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a->result[a->enum_av] = -400.0;
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a->result[a->enum_pk] = -400.0;
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if ((a->pgain != 0) && (a->enum_gain >= 0))
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a->result[a->enum_gain] = -400.0;
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}
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void xmeter (METER a)
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{
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int srun;
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EnterCriticalSection (&a->mtupdate);
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if (a->prun != 0)
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srun = *(a->prun);
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else
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srun = 1;
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if (a->run && srun)
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{
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int i;
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double smag;
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double np = 0.0;
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for (i = 0; i < a->size; i++)
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{
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smag = a->buff[2 * i + 0] * a->buff[2 * i + 0] + a->buff[2 * i + 1] * a->buff[2 * i + 1];
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a->avg = a->avg * a->mult_average + (1.0 - a->mult_average) * smag;
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a->peak *= a->mult_peak;
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if (smag > np) np = smag;
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}
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if (np > a->peak) a->peak = np;
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a->result[a->enum_av] = 10.0 * mlog10 (a->avg + 1.0e-40);
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a->result[a->enum_pk] = 10.0 * mlog10 (a->peak + 1.0e-40);
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if ((a->pgain != 0) && (a->enum_gain >= 0))
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a->result[a->enum_gain] = 20.0 * mlog10 (*a->pgain + 1.0e-40);
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}
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else
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{
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if (a->enum_av >= 0) a->result[a->enum_av] = - 400.0;
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if (a->enum_pk >= 0) a->result[a->enum_pk] = - 400.0;
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if (a->enum_gain >= 0) a->result[a->enum_gain] = + 0.0;
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}
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LeaveCriticalSection (&a->mtupdate);
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}
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void setBuffers_meter (METER a, double* in)
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{
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a->buff = in;
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}
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void setSamplerate_meter (METER a, int rate)
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{
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a->rate = rate;
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calc_meter(a);
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}
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void setSize_meter (METER a, int size)
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{
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a->size = size;
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flush_meter (a);
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}
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/********************************************************************************************************
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* *
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* RXA Properties *
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* *
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********************************************************************************************************/
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PORT
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double GetRXAMeter (int channel, int mt)
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{
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double val;
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CRITICAL_SECTION* a = rxa[channel].pmtupdate[mt];
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EnterCriticalSection (a);
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val = rxa[channel].meter[mt];
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LeaveCriticalSection (a);
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return val;
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}
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/********************************************************************************************************
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* *
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* TXA Properties *
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* *
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********************************************************************************************************/
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PORT
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double GetTXAMeter (int channel, int mt)
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{
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double val;
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CRITICAL_SECTION* a = txa[channel].pmtupdate[mt];
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EnterCriticalSection (a);
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val = txa[channel].meter[mt];
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LeaveCriticalSection (a);
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return val;
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}
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