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101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
/* compress.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2011, 2013, 2017 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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This software is based upon the algorithm described by Peter Martinez, G3PLX,
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in the January 2010 issue of RadCom magazine.
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*/
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#include "comm.hpp"
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#include "compress.hpp"
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#include "TXA.hpp"
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namespace WDSP {
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COMPRESSOR::COMPRESSOR(
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int _run,
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int _buffsize,
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float* _inbuff,
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float* _outbuff,
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double _gain
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) :
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run(_run),
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buffsize(_buffsize),
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inbuff(_inbuff),
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outbuff(_outbuff),
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gain(_gain)
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{}
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void COMPRESSOR::flush()
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{
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// Nothing to do
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}
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void COMPRESSOR::execute()
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{
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double mag;
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if (run)
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for (int i = 0; i < buffsize; i++)
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{
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mag = sqrt(inbuff[2 * i + 0] * inbuff[2 * i + 0] + inbuff[2 * i + 1] * inbuff[2 * i + 1]);
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if (gain * mag > 1.0)
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outbuff[2 * i + 0] = (float) (inbuff[2 * i + 0] / mag);
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else
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outbuff[2 * i + 0] = (float) (inbuff[2 * i + 0] * gain);
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outbuff[2 * i + 1] = 0.0;
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}
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else if (inbuff != outbuff)
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std::copy(inbuff, inbuff + buffsize * 2, outbuff);
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}
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void COMPRESSOR::setBuffers(float* _in, float* _out)
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{
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inbuff = _in;
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outbuff = _out;
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}
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void COMPRESSOR::setSamplerate(int)
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{
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// Nothing to do
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}
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void COMPRESSOR::setSize(int _size)
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{
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buffsize = _size;
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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 COMPRESSOR::setGain(float _gain)
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{
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gain = pow (10.0, _gain / 20.0);
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}
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} // namespace WDSP
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