kopia lustrzana https://github.com/f4exb/sdrangel
116 wiersze
3.3 KiB
C++
116 wiersze
3.3 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::create_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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float gain )
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{
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COMPRESSOR *a = new COMPRESSOR;
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a->run = run;
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a->inbuff = inbuff;
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a->outbuff = outbuff;
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a->buffsize = buffsize;
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a->gain = gain;
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return a;
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}
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void COMPRESSOR::destroy_compressor (COMPRESSOR *a)
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{
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delete (a);
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}
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void COMPRESSOR::flush_compressor (COMPRESSOR *)
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{
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}
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void COMPRESSOR::xcompressor (COMPRESSOR *a)
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{
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int i;
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float mag;
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if (a->run)
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for (i = 0; i < a->buffsize; i++)
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{
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mag = sqrt(a->inbuff[2 * i + 0] * a->inbuff[2 * i + 0] + a->inbuff[2 * i + 1] * a->inbuff[2 * i + 1]);
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if (a->gain * mag > 1.0)
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a->outbuff[2 * i + 0] = a->inbuff[2 * i + 0] / mag;
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else
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a->outbuff[2 * i + 0] = a->inbuff[2 * i + 0] * a->gain;
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a->outbuff[2 * i + 1] = 0.0;
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}
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else if (a->inbuff != a->outbuff)
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memcpy(a->outbuff, a->inbuff, a->buffsize * sizeof (wcomplex));
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}
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void COMPRESSOR::setBuffers_compressor (COMPRESSOR *a, float* in, float* out)
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{
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a->inbuff = in;
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a->outbuff = out;
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}
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void COMPRESSOR::setSamplerate_compressor (COMPRESSOR *, int)
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{
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}
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void COMPRESSOR::setSize_compressor (COMPRESSOR *a, int size)
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{
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a->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::SetCompressorRun (TXA& txa, int run)
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{
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if (txa.compressor.p->run != run)
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{
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txa.compressor.p->run = run;
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TXA::SetupBPFilters (txa);
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}
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}
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void COMPRESSOR::SetCompressorGain (TXA& txa, float gain)
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{
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txa.compressor.p->gain = pow (10.0, gain / 20.0);
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}
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} // namespace WDSP
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