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137 lines
3.1 KiB
C++
137 lines
3.1 KiB
C++
/* shift.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 "shift.hpp"
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namespace WDSP {
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void SHIFT::calc()
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{
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delta = TWOPI * shift / rate;
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cos_delta = cos (delta);
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sin_delta = sin (delta);
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}
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SHIFT::SHIFT (
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int _run,
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int _size,
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float* _in,
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float* _out,
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int _rate,
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double _fshift
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) :
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run(_run),
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size(_size),
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in(_in),
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out(_out),
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rate((double) _rate),
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shift(_fshift),
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phase(0.0)
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{
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calc();
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}
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void SHIFT::flush()
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{
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phase = 0.0;
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}
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void SHIFT::execute()
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{
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if (run)
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{
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double I1;
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double Q1;
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double t1;
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double t2;
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double cos_phase = cos (phase);
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double sin_phase = sin (phase);
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for (int i = 0; i < size; i++)
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{
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I1 = in[2 * i + 0];
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Q1 = in[2 * i + 1];
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out[2 * i + 0] = (float) (I1 * cos_phase - Q1 * sin_phase);
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out[2 * i + 1] = (float) (I1 * sin_phase + Q1 * cos_phase);
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t1 = cos_phase;
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t2 = sin_phase;
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cos_phase = t1 * cos_delta - t2 * sin_delta;
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sin_phase = t1 * sin_delta + t2 * cos_delta;
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phase += delta;
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if (phase >= TWOPI)
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phase -= TWOPI;
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if (phase < 0.0 )
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phase += TWOPI;
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}
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}
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else if (in != out)
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{
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std::copy( in, in + size * 2, out);
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}
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}
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void SHIFT::setBuffers(float* _in, float* _out)
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{
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in = _in;
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out = _out;
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}
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void SHIFT::setSamplerate(int _rate)
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{
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rate = _rate;
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phase = 0.0;
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calc();
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}
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void SHIFT::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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* Non static *
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* *
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********************************************************************************************************/
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void SHIFT::SetRun (int _run)
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{
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run = _run;
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}
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void SHIFT::SetFreq(double _fshift)
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{
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shift = _fshift;
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calc();
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}
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} // namespace WDSP
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