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sdrangel/sdrbase/dsp/samplesinkfifodoublebuffered.cpp

69 lines
2.4 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 Edouard Griffiths, F4EXB //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include "samplesinkfifodoublebuffered.h"
SampleSinkFifoDoubleBuffered::SampleSinkFifoDoubleBuffered(uint32_t size, uint32_t signalThreshold) :
m_size(size),
m_signalThreshold(signalThreshold),
m_i(0),
m_count(0),
m_readIndex(0),
m_readCount(0)
{
assert(m_signalThreshold < m_size/2);
m_data.resize(2*m_size);
}
SampleSinkFifoDoubleBuffered::~SampleSinkFifoDoubleBuffered()
{
}
void SampleSinkFifoDoubleBuffered::getWriteIterator(SampleVector::iterator& it1)
{
it1 = m_data.begin() + m_i;
}
void SampleSinkFifoDoubleBuffered::bumpIndex(SampleVector::iterator& it1)
{
m_data[m_i+m_size] = m_data[m_i];
m_i = (m_i+1) % m_size;
it1 = m_data.begin() + m_i;
if (m_count < m_signalThreshold)
{
m_count++;
}
else
{
QMutexLocker mutexLocker(&m_mutex);
m_readIndex = m_i + m_size - m_count;
m_readCount = m_count;
m_count = 0;
emit dataReady();
}
}
void SampleSinkFifoDoubleBuffered::read(SampleVector::iterator& begin, SampleVector::iterator& end)
{
QMutexLocker mutexLocker(&m_mutex);
begin = m_data.begin() + m_readIndex;
end = begin + m_readCount;
}