118 lines
2.9 KiB
C
118 lines
2.9 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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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.h"
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COMPRESSOR create_compressor (
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int run,
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int buffsize,
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double* inbuff,
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double* outbuff,
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double gain )
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{
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COMPRESSOR a;
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a = (COMPRESSOR) malloc0 (sizeof (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 destroy_compressor (COMPRESSOR a)
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{
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_aligned_free (a);
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}
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void flush_compressor (COMPRESSOR a)
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{
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}
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void xcompressor (COMPRESSOR a)
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{
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int i;
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double 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 (complex));
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}
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void setBuffers_compressor (COMPRESSOR a, double* in, double* 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 setSamplerate_compressor (COMPRESSOR a, int rate)
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{
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}
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void 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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PORT void
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SetTXACompressorRun (int channel, int run)
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{
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if (txa[channel].compressor.p->run != run)
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{
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EnterCriticalSection (&ch[channel].csDSP);
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txa[channel].compressor.p->run = run;
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TXASetupBPFilters (channel);
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LeaveCriticalSection (&ch[channel].csDSP);
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}
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}
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PORT void
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SetTXACompressorGain (int channel, double gain)
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{
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EnterCriticalSection (&ch[channel].csDSP);
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txa[channel].compressor.p->gain = pow (10.0, gain / 20.0);
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LeaveCriticalSection (&ch[channel].csDSP);
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}
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