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https://github.com/f4exb/sdrangel.git
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86 lines
3.4 KiB
C++
86 lines
3.4 KiB
C++
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2020 Edouard Griffiths, F4EXB //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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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 V3 for more details. //
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// //
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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, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include "metismisodecimators.h"
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MetisMISODecimators::MetisMISODecimators()
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{
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resetCounters();
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}
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void MetisMISODecimators::resetCounters()
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{
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std::fill(m_counters, m_counters+MetisMISOSettings::m_maxReceivers, 0);
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}
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int MetisMISODecimators::decimate2(qint32 sampleI, qint32 sampleQ, SampleVector& result, unsigned int streamIndex)
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{
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if (streamIndex < MetisMISOSettings::m_maxReceivers)
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{
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m_accumulators[streamIndex][m_counters[streamIndex]++] = sampleI;
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m_accumulators[streamIndex][m_counters[streamIndex]++] = sampleQ;
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if (m_counters[streamIndex] >= 8)
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{
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SampleVector::iterator it = result.begin();
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m_decimatorsIQ[streamIndex].decimate2_cen(&it, m_accumulators[streamIndex], 8);
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m_counters[streamIndex] = 0;
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return 2; // 2 samples available
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}
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}
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return 0;
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}
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int MetisMISODecimators::decimate4(qint32 sampleI, qint32 sampleQ, SampleVector& result, unsigned int streamIndex)
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{
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if (streamIndex < MetisMISOSettings::m_maxReceivers)
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{
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m_accumulators[streamIndex][m_counters[streamIndex]++] = sampleI;
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m_accumulators[streamIndex][m_counters[streamIndex]++] = sampleQ;
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if (m_counters[streamIndex] >= 16)
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{
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SampleVector::iterator it = result.begin();
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m_decimatorsIQ[streamIndex].decimate4_cen(&it, m_accumulators[streamIndex], 16);
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m_counters[streamIndex] = 0;
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return 2; // 2 samples available
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}
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}
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return 0;
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}
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int MetisMISODecimators::decimate8(qint32 sampleI, qint32 sampleQ, SampleVector& result, unsigned int streamIndex)
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{
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if (streamIndex < MetisMISOSettings::m_maxReceivers)
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{
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m_accumulators[streamIndex][m_counters[streamIndex]++] = sampleI;
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m_accumulators[streamIndex][m_counters[streamIndex]++] = sampleQ;
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if (m_counters[streamIndex] >= 16)
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{
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SampleVector::iterator it = result.begin();
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m_decimatorsIQ[streamIndex].decimate8_cen(&it, m_accumulators[streamIndex], 16);
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m_counters[streamIndex] = 0;
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return 1; // 1 sample available
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}
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}
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return 0;
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}
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