kopia lustrzana https://github.com/f4exb/sdrangel
384 wiersze
11 KiB
C++
384 wiersze
11 KiB
C++
/* siphon.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 "siphon.hpp"
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#include "RXA.hpp"
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#include "TXA.hpp"
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namespace WDSP {
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void SIPHON::build_window (SIPHON *a)
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{
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int i;
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double arg0, cosphi;
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double sum, scale;
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arg0 = 2.0 * PI / ((double)a->fftsize - 1.0);
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sum = 0.0;
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for (i = 0; i < a->fftsize; i++)
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{
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cosphi = cos (arg0 * (double)i);
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a->window[i] = + 6.3964424114390378e-02
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+ cosphi * ( - 2.3993864599352804e-01
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+ cosphi * ( + 3.5015956323820469e-01
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+ cosphi * ( - 2.4774111897080783e-01
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+ cosphi * ( + 8.5438256055858031e-02
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+ cosphi * ( - 1.2320203369293225e-02
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+ cosphi * ( + 4.3778825791773474e-04 ))))));
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sum += a->window[i];
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}
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scale = 1.0 / sum;
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for (i = 0; i < a->fftsize; i++)
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a->window[i] *= scale;
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}
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SIPHON* SIPHON::create_siphon (
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int run,
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int position,
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int mode,
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int disp,
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int insize,
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double* in,
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int sipsize,
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int fftsize,
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int specmode
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)
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{
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SIPHON *a = new SIPHON;
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a->run = run;
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a->position = position;
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a->mode = mode;
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a->disp = disp;
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a->insize = insize;
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a->in = in;
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a->sipsize = sipsize; // NOTE: sipsize MUST BE A POWER OF TWO!!
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a->fftsize = fftsize;
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a->specmode = specmode;
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a->sipbuff = new double[a->sipsize * 2]; // (double *) malloc0 (a->sipsize * sizeof (complex));
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a->idx = 0;
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a->sipout = new double[a->sipsize * 2]; // (double *) malloc0 (a->sipsize * sizeof (complex));
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a->specout = new double[a->fftsize * 2]; // (double *) malloc0 (a->fftsize * sizeof (complex));
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a->sipplan = fftw_plan_dft_1d (a->fftsize, (fftw_complex *)a->sipout, (fftw_complex *)a->specout, FFTW_FORWARD, FFTW_PATIENT);
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a->window = new double[a->fftsize * 2]; // (double *) malloc0 (a->fftsize * sizeof (complex));
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build_window (a);
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return a;
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}
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void SIPHON::destroy_siphon (SIPHON *a)
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{
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fftw_destroy_plan (a->sipplan);
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delete[] (a->window);
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delete[] (a->specout);
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delete[] (a->sipout);
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delete[] (a->sipbuff);
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delete (a);
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}
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void SIPHON::flush_siphon (SIPHON *a)
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{
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memset (a->sipbuff, 0, a->sipsize * sizeof (dcomplex));
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memset (a->sipout , 0, a->sipsize * sizeof (dcomplex));
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memset (a->specout, 0, a->fftsize * sizeof (dcomplex));
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a->idx = 0;
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}
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void SIPHON::xsiphon (SIPHON *a, int pos)
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{
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int first, second;
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a->update.lock();
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if (a->run && a->position == pos)
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{
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switch (a->mode)
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{
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case 0:
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if (a->insize >= a->sipsize)
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memcpy (a->sipbuff, &(a->in[2 * (a->insize - a->sipsize)]), a->sipsize * sizeof (dcomplex));
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else
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{
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if (a->insize > (a->sipsize - a->idx))
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{
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first = a->sipsize - a->idx;
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second = a->insize - first;
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}
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else
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{
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first = a->insize;
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second = 0;
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}
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memcpy (a->sipbuff + 2 * a->idx, a->in, first * sizeof (dcomplex));
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memcpy (a->sipbuff, a->in + 2 * first, second * sizeof (dcomplex));
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if ((a->idx += a->insize) >= a->sipsize) a->idx -= a->sipsize;
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}
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break;
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case 1:
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// Spectrum0 (1, a->disp, 0, 0, a->in);
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break;
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}
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}
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a->update.unlock();
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}
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void SIPHON::setBuffers_siphon (SIPHON *a, double* in)
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{
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a->in = in;
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}
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void SIPHON::setSamplerate_siphon (SIPHON *a, int)
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{
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flush_siphon (a);
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}
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void SIPHON::setSize_siphon (SIPHON *a, int size)
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{
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a->insize = size;
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flush_siphon (a);
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}
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void SIPHON::suck (SIPHON *a)
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{
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if (a->outsize <= a->sipsize)
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{
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int mask = a->sipsize - 1;
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int j = (a->idx - a->outsize) & mask;
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int size = a->sipsize - j;
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if (size >= a->outsize)
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memcpy (a->sipout, &(a->sipbuff[2 * j]), a->outsize * sizeof (dcomplex));
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else
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{
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memcpy (a->sipout, &(a->sipbuff[2 * j]), size * sizeof (dcomplex));
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memcpy (&(a->sipout[2 * size]), a->sipbuff, (a->outsize - size) * sizeof (dcomplex));
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}
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}
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}
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void SIPHON::sip_spectrum (SIPHON *a)
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{
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int i;
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for (i = 0; i < a->fftsize; i++)
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{
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a->sipout[2 * i + 0] *= a->window[i];
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a->sipout[2 * i + 1] *= a->window[i];
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}
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fftw_execute (a->sipplan);
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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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void SIPHON::GetaSipF (RXA& rxa, float* out, int size)
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{ // return raw samples as floats
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SIPHON *a=rxa.sip1.p;
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int i;
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a->update.lock();
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a->outsize = size;
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suck (a);
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a->update.unlock();
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for (i = 0; i < size; i++)
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{
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out[i] = (float)a->sipout[2 * i + 0];
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}
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}
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void SIPHON::GetaSipF1 (RXA& rxa, float* out, int size)
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{ // return raw samples as floats
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SIPHON *a=rxa.sip1.p;
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int i;
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a->update.lock();
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a->outsize = size;
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suck (a);
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a->update.unlock();
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for (i = 0; i < size; i++)
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{
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out[2 * i + 0] = (float)a->sipout[2 * i + 0];
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out[2 * i + 1] = (float)a->sipout[2 * i + 1];
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}
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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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void SIPHON::SetSipPosition (TXA& txa, int pos)
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{
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SIPHON *a = txa.sip1.p;
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a->update.lock();
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a->position = pos;
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a->update.unlock();
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}
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void SIPHON::SetSipMode (TXA& txa, int mode)
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{
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SIPHON *a = txa.sip1.p;
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a->update.lock();
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a->mode = mode;
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a->update.unlock();
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}
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void SIPHON::SetSipDisplay (TXA& txa, int disp)
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{
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SIPHON *a = txa.sip1.p;
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a->update.lock();
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a->disp = disp;
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a->update.unlock();
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}
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void SIPHON::GetaSipF (TXA& txa, float* out, int size)
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{ // return raw samples as floats
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SIPHON *a = txa.sip1.p;
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int i;
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a->update.lock();
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a->outsize = size;
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suck (a);
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a->update.unlock();
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for (i = 0; i < size; i++)
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{
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out[i] = (float)a->sipout[2 * i + 0];
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}
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}
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void SIPHON::GetaSipF1 (TXA& txa, float* out, int size)
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{ // return raw samples as floats
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SIPHON *a = txa.sip1.p;
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int i;
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a->update.lock();
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a->outsize = size;
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suck (a);
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a->update.unlock();
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for (i = 0; i < size; i++)
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{
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out[2 * i + 0] = (float)a->sipout[2 * i + 0];
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out[2 * i + 1] = (float)a->sipout[2 * i + 1];
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}
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}
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void SIPHON::SetSipSpecmode (TXA& txa, int mode)
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{
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SIPHON *a = txa.sip1.p;
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if (mode == 0)
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a->specmode = 0;
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else
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a->specmode = 1;
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}
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void SIPHON::GetSpecF1 (TXA& txa, float* out)
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{ // return spectrum magnitudes in dB
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SIPHON *a = txa.sip1.p;
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int i, j, mid, m, n;
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a->update.lock();
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a->outsize = a->fftsize;
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suck (a);
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a->update.unlock();
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sip_spectrum (a);
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mid = a->fftsize / 2;
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if (a->specmode != 1)
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// swap the halves of the spectrum
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for (i = 0, j = mid; i < mid; i++, j++)
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{
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out[i] = (float)(10.0 * MemLog::mlog10 (a->specout[2 * j + 0] * a->specout[2 * j + 0] + a->specout[2 * j + 1] * a->specout[2 * j + 1] + 1.0e-60));
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out[j] = (float)(10.0 * MemLog::mlog10 (a->specout[2 * i + 0] * a->specout[2 * i + 0] + a->specout[2 * i + 1] * a->specout[2 * i + 1] + 1.0e-60));
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}
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else
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// mirror each half of the spectrum in-place
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for (i = 0, j = mid - 1, m = mid, n = a->fftsize - 1; i < mid; i++, j--, m++, n--)
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{
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out[i] = (float)(10.0 * MemLog::mlog10 (a->specout[2 * j + 0] * a->specout[2 * j + 0] + a->specout[2 * j + 1] * a->specout[2 * j + 1] + 1.0e-60));
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out[m] = (float)(10.0 * MemLog::mlog10 (a->specout[2 * n + 0] * a->specout[2 * n + 0] + a->specout[2 * n + 1] * a->specout[2 * n + 1] + 1.0e-60));
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}
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}
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/********************************************************************************************************
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* *
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* CALLS FOR EXTERNAL USE *
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* *
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********************************************************************************************************/
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/*
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#define MAX_EXT_SIPHONS (2) // maximum number of Siphons called from outside wdsp
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__declspec (align (16)) SIPHON psiphon[MAX_EXT_SIPHONS]; // array of pointers for Siphons used EXTERNAL to wdsp
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PORT
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void create_siphonEXT (int id, int run, int insize, int sipsize, int fftsize, int specmode)
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{
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psiphon[id] = create_siphon (run, 0, 0, 0, insize, 0, sipsize, fftsize, specmode);
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}
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PORT
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void destroy_siphonEXT (int id)
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{
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destroy_siphon (psiphon[id]);
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}
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PORT
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void flush_siphonEXT (int id)
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{
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flush_siphon (psiphon[id]);
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}
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PORT
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void xsiphonEXT (int id, double* buff)
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{
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SIPHON a = psiphon[id];
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a->in = buff;
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xsiphon (a, 0);
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}
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PORT
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void GetaSipF1EXT (int id, float* out, int size)
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{ // return raw samples as floats
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SIPHON a = psiphon[id];
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int i;
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a->update.lock();
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a->outsize = size;
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suck (a);
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a->update.unlock();
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for (i = 0; i < size; i++)
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{
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out[2 * i + 0] = (float)a->sipout[2 * i + 0];
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out[2 * i + 1] = (float)a->sipout[2 * i + 1];
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}
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}
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PORT
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void SetSiphonInsize (int id, int size)
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{
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SIPHON a = psiphon[id];
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a->update.lock();
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a->insize = size;
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a->update.unlock();
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}
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*/
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} // namespace WDSP
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