2016-10-06 09:39:18 -04:00
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016 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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2019-04-11 08:32:15 -04:00
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// (at your option) any later version. //
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2016-10-06 09:39:18 -04:00
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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 "samplesinkfifodoublebuffered.h"
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SampleSinkFifoDoubleBuffered::SampleSinkFifoDoubleBuffered(uint32_t size, uint32_t signalThreshold) :
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m_size(size),
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m_signalThreshold(signalThreshold),
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m_i(0),
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m_count(0),
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m_readIndex(0),
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m_readCount(0)
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{
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assert(m_signalThreshold < m_size/2);
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m_data.resize(2*m_size);
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}
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SampleSinkFifoDoubleBuffered::~SampleSinkFifoDoubleBuffered()
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{
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}
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void SampleSinkFifoDoubleBuffered::getWriteIterator(SampleVector::iterator& it1)
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{
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it1 = m_data.begin() + m_i;
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}
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void SampleSinkFifoDoubleBuffered::bumpIndex(SampleVector::iterator& it1)
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{
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m_data[m_i+m_size] = m_data[m_i];
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m_i = (m_i+1) % m_size;
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it1 = m_data.begin() + m_i;
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if (m_count < m_signalThreshold)
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{
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m_count++;
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}
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else
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{
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QMutexLocker mutexLocker(&m_mutex);
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m_readIndex = m_i + m_size - m_count;
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m_readCount = m_count;
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m_count = 0;
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emit dataReady();
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}
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}
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void SampleSinkFifoDoubleBuffered::read(SampleVector::iterator& begin, SampleVector::iterator& end)
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{
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QMutexLocker mutexLocker(&m_mutex);
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begin = m_data.begin() + m_readIndex;
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end = begin + m_readCount;
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}
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