WDSP: split iir source files

wdsp/dsphp.cpp

@@ -0,0 +1,140 @@
+/*  iir.c
+
+This file is part of a program that implements a Software-Defined Radio.
+
+Copyright (C) 2014, 2022, 2023 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 "dsphp.hpp"
+#include "RXA.hpp"
+#include "TXA.hpp"
+
+namespace WDSP {
+
+/********************************************************************************************************
+*                                                                                                       *
+*                                    Double Single-Pole High-Pass                                       *
+*                                                                                                       *
+********************************************************************************************************/
+
+void DSPHP::calc_dsphp(DSPHP *a)
+{
+    double g;
+    a->x0 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
+    a->x1 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
+    a->y0 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
+    a->y1 = new double[a->nstages]; // (float*)malloc0(a->nstages * sizeof(float));
+    g = exp(-TWOPI * a->fc / a->rate);
+    a->b0 = +0.5 * (1.0 + g);
+    a->b1 = -0.5 * (1.0 + g);
+    a->a1 = -g;
+}
+
+DSPHP* DSPHP::create_dsphp(int run, int size, float* in, float* out, double rate, double fc, int nstages)
+{
+    DSPHP *a = new DSPHP;
+    a->run = run;
+    a->size = size;
+    a->in = in;
+    a->out = out;
+    a->rate = rate;
+    a->fc = fc;
+    a->nstages = nstages;
+    calc_dsphp(a);
+    return a;
+}
+
+void DSPHP::decalc_dsphp(DSPHP *a)
+{
+    delete[](a->y1);
+    delete[](a->y0);
+    delete[](a->x1);
+    delete[](a->x0);
+}
+
+void DSPHP::destroy_dsphp(DSPHP *a)
+{
+    decalc_dsphp(a);
+    delete(a);
+}
+
+void DSPHP::flush_dsphp(DSPHP *a)
+{
+    memset(a->x0, 0, a->nstages * sizeof(float));
+    memset(a->x1, 0, a->nstages * sizeof(float));
+    memset(a->y0, 0, a->nstages * sizeof(float));
+    memset(a->y1, 0, a->nstages * sizeof(float));
+}
+
+void DSPHP::xdsphp(DSPHP *a)
+{
+    if (a->run)
+    {
+        int i, n;
+
+        for (i = 0; i < a->size; i++)
+        {
+            a->x0[0] = a->in[i];
+
+            for (n = 0; n < a->nstages; n++)
+            {
+                if (n > 0)
+                    a->x0[n] = a->y0[n - 1];
+
+                a->y0[n] = a->b0 * a->x0[n]
+                    + a->b1 * a->x1[n]
+                    - a->a1 * a->y1[n];
+                a->y1[n] = a->y0[n];
+                a->x1[n] = a->x0[n];
+            }
+
+            a->out[i] = a->y0[a->nstages - 1];
+        }
+    }
+    else if (a->out != a->in)
+    {
+        memcpy(a->out, a->in, a->size * sizeof(float));
+    }
+}
+
+void DSPHP::setBuffers_dsphp(DSPHP *a, float* in, float* out)
+{
+    a->in = in;
+    a->out = out;
+}
+
+void DSPHP::setSamplerate_dsphp(DSPHP *a, int rate)
+{
+    decalc_dsphp(a);
+    a->rate = rate;
+    calc_dsphp(a);
+}
+
+void DSPHP::setSize_dsphp(DSPHP *a, int size)
+{
+    a->size = size;
+    flush_dsphp(a);
+}
+
+} // namespace WDSP