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238 lines
8.2 KiB
C++
238 lines
8.2 KiB
C++
/* firmin.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2016 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 "fir.hpp"
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#include "fircore.hpp"
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namespace WDSP {
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/********************************************************************************************************
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* *
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* Partitioned Overlap-Save Filter Kernel *
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* *
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********************************************************************************************************/
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void FIRCORE::plan_fircore (FIRCORE *a)
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{
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// must call for change in 'nc', 'size', 'out'
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int i;
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a->nfor = a->nc / a->size;
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a->cset = 0;
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a->buffidx = 0;
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a->idxmask = a->nfor - 1;
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a->fftin = new float[2 * a->size * 2]; // (float *) malloc0 (2 * a->size * sizeof (complex));
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a->fftout = new float*[a->nfor]; // (float **) malloc0 (a->nfor * sizeof (float *));
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a->fmask = new float**[2]; // (float ***) malloc0 (2 * sizeof (float **));
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a->fmask[0] = new float*[a->nfor]; // (float **) malloc0 (a->nfor * sizeof (float *));
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a->fmask[1] = new float*[a->nfor]; // (float **) malloc0 (a->nfor * sizeof (float *));
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a->maskgen = new float[2 * a->size * 2]; // (float *) malloc0 (2 * a->size * sizeof (complex));
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a->pcfor = new fftwf_plan[a->nfor]; // (fftwf_plan *) malloc0 (a->nfor * sizeof (fftwf_plan));
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a->maskplan = new fftwf_plan*[2]; // (fftwf_plan **) malloc0 (2 * sizeof (fftwf_plan *));
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a->maskplan[0] = new fftwf_plan[a->nfor]; // (fftwf_plan *) malloc0 (a->nfor * sizeof (fftwf_plan));
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a->maskplan[1] = new fftwf_plan[a->nfor]; // (fftwf_plan *) malloc0 (a->nfor * sizeof (fftwf_plan));
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for (i = 0; i < a->nfor; i++)
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{
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a->fftout[i] = new float[2 * a->size * 2]; // (float *) malloc0 (2 * a->size * sizeof (complex));
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a->fmask[0][i] = new float[2 * a->size * 2]; // (float *) malloc0 (2 * a->size * sizeof (complex));
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a->fmask[1][i] = new float[2 * a->size * 2]; // (float *) malloc0 (2 * a->size * sizeof (complex));
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a->pcfor[i] = fftwf_plan_dft_1d(2 * a->size, (fftwf_complex *)a->fftin, (fftwf_complex *)a->fftout[i], FFTW_FORWARD, FFTW_PATIENT);
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a->maskplan[0][i] = fftwf_plan_dft_1d(2 * a->size, (fftwf_complex *)a->maskgen, (fftwf_complex *)a->fmask[0][i], FFTW_FORWARD, FFTW_PATIENT);
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a->maskplan[1][i] = fftwf_plan_dft_1d(2 * a->size, (fftwf_complex *)a->maskgen, (fftwf_complex *)a->fmask[1][i], FFTW_FORWARD, FFTW_PATIENT);
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}
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a->accum = new float[2 * a->size * 2]; // (float *) malloc0 (2 * a->size * sizeof (complex));
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a->crev = fftwf_plan_dft_1d(2 * a->size, (fftwf_complex *)a->accum, (fftwf_complex *)a->out, FFTW_BACKWARD, FFTW_PATIENT);
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a->masks_ready = 0;
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}
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void FIRCORE::calc_fircore (FIRCORE *a, int flip)
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{
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// call for change in frequency, rate, wintype, gain
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// must also call after a call to plan_firopt()
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int i;
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if (a->mp)
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FIR::mp_imp (a->nc, a->impulse, a->imp, 16, 0);
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else
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memcpy (a->imp, a->impulse, a->nc * sizeof (wcomplex));
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for (i = 0; i < a->nfor; i++)
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{
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// I right-justified the impulse response => take output from left side of output buff, discard right side
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// Be careful about flipping an asymmetrical impulse response.
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memcpy (&(a->maskgen[2 * a->size]), &(a->imp[2 * a->size * i]), a->size * sizeof(wcomplex));
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fftwf_execute (a->maskplan[1 - a->cset][i]);
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}
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a->masks_ready = 1;
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if (flip)
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{
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a->cset = 1 - a->cset;
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a->masks_ready = 0;
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}
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}
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FIRCORE* FIRCORE::create_fircore (int size, float* in, float* out, int nc, int mp, float* impulse)
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{
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FIRCORE *a = new FIRCORE;
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a->size = size;
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a->in = in;
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a->out = out;
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a->nc = nc;
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a->mp = mp;
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// InitializeCriticalSectionAndSpinCount (&a->update, 2500);
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plan_fircore (a);
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a->impulse = new float[a->nc * 2]; // (float *) malloc0 (a->nc * sizeof (complex));
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a->imp = new float[a->nc * 2]; // (float *) malloc0 (a->nc * sizeof (complex));
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memcpy (a->impulse, impulse, a->nc * sizeof (wcomplex));
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calc_fircore (a, 1);
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return a;
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}
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void FIRCORE::deplan_fircore (FIRCORE *a)
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{
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int i;
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fftwf_destroy_plan (a->crev);
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delete[] (a->accum);
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for (i = 0; i < a->nfor; i++)
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{
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delete[] (a->fftout[i]);
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delete[] (a->fmask[0][i]);
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delete[] (a->fmask[1][i]);
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fftwf_destroy_plan (a->pcfor[i]);
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fftwf_destroy_plan (a->maskplan[0][i]);
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fftwf_destroy_plan (a->maskplan[1][i]);
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}
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delete[] (a->maskplan[0]);
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delete[] (a->maskplan[1]);
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delete[] (a->maskplan);
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delete[] (a->pcfor);
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delete[] (a->maskgen);
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delete[] (a->fmask[0]);
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delete[] (a->fmask[1]);
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delete[] (a->fmask);
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delete[] (a->fftout);
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delete[] (a->fftin);
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}
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void FIRCORE::destroy_fircore (FIRCORE *a)
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{
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deplan_fircore (a);
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delete[] (a->imp);
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delete[] (a->impulse);
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delete (a);
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}
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void FIRCORE::flush_fircore (FIRCORE *a)
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{
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int i;
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memset (a->fftin, 0, 2 * a->size * sizeof (wcomplex));
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for (i = 0; i < a->nfor; i++)
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memset (a->fftout[i], 0, 2 * a->size * sizeof (wcomplex));
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a->buffidx = 0;
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}
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void FIRCORE::xfircore (FIRCORE *a)
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{
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int i, j, k;
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memcpy (&(a->fftin[2 * a->size]), a->in, a->size * sizeof (wcomplex));
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fftwf_execute (a->pcfor[a->buffidx]);
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k = a->buffidx;
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memset (a->accum, 0, 2 * a->size * sizeof (wcomplex));
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for (j = 0; j < a->nfor; j++)
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{
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for (i = 0; i < 2 * a->size; i++)
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{
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a->accum[2 * i + 0] += a->fftout[k][2 * i + 0] * a->fmask[a->cset][j][2 * i + 0] - a->fftout[k][2 * i + 1] * a->fmask[a->cset][j][2 * i + 1];
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a->accum[2 * i + 1] += a->fftout[k][2 * i + 0] * a->fmask[a->cset][j][2 * i + 1] + a->fftout[k][2 * i + 1] * a->fmask[a->cset][j][2 * i + 0];
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}
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k = (k + a->idxmask) & a->idxmask;
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}
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a->buffidx = (a->buffidx + 1) & a->idxmask;
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fftwf_execute (a->crev);
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memcpy (a->fftin, &(a->fftin[2 * a->size]), a->size * sizeof(wcomplex));
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}
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void FIRCORE::setBuffers_fircore (FIRCORE *a, float* in, float* out)
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{
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a->in = in;
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a->out = out;
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deplan_fircore (a);
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plan_fircore (a);
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calc_fircore (a, 1);
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}
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void FIRCORE::setSize_fircore (FIRCORE *a, int size)
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{
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a->size = size;
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deplan_fircore (a);
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plan_fircore (a);
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calc_fircore (a, 1);
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}
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void FIRCORE::setImpulse_fircore (FIRCORE *a, float* impulse, int update)
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{
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memcpy (a->impulse, impulse, a->nc * sizeof (wcomplex));
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calc_fircore (a, update);
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}
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void FIRCORE::setNc_fircore (FIRCORE *a, int nc, float* impulse)
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{
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// because of FFT planning, this will probably cause a glitch in audio if done during dataflow
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deplan_fircore (a);
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delete[] (a->impulse);
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delete[] (a->imp);
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a->nc = nc;
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plan_fircore (a);
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a->imp = new float[a->nc * 2]; // (float *) malloc0 (a->nc * sizeof (complex));
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a->impulse = new float[a->nc * 2]; // (float *) malloc0 (a->nc * sizeof (complex));
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memcpy (a->impulse, impulse, a->nc * sizeof (wcomplex));
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calc_fircore (a, 1);
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}
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void FIRCORE::setMp_fircore (FIRCORE *a, int mp)
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{
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a->mp = mp;
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calc_fircore (a, 1);
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}
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void FIRCORE::setUpdate_fircore (FIRCORE *a)
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{
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if (a->masks_ready)
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{
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a->cset = 1 - a->cset;
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a->masks_ready = 0;
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}
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}
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} // namespace WDSP
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