mirror of
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95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 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 "remotesinkfifo.h"
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RemoteSinkFifo::RemoteSinkFifo(QObject *parent) :
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QObject(parent)
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{}
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RemoteSinkFifo::RemoteSinkFifo(unsigned int size, QObject *parent) :
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QObject(parent)
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{
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resize(size);
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}
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RemoteSinkFifo::~RemoteSinkFifo()
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{}
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void RemoteSinkFifo::resize(unsigned int size)
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{
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QMutexLocker mutexLocker(&m_mutex);
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m_size = size;
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m_data.resize(m_size);
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m_readHead = 0;
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m_servedHead = 0;
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m_writeHead = 0;
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}
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void RemoteSinkFifo::reset()
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{
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m_readHead = 0;
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m_servedHead = 0;
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m_writeHead = 0;
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}
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RemoteDataBlock *RemoteSinkFifo::getDataBlock()
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{
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QMutexLocker mutexLocker(&m_mutex);
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m_servedHead = m_writeHead;
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if (m_writeHead < m_size - 1) {
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m_writeHead++;
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} else {
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m_writeHead = 0;
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}
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emit dataBlockServed();
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return &m_data[m_servedHead];
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}
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unsigned int RemoteSinkFifo::readDataBlock(RemoteDataBlock **dataBlock)
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{
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QMutexLocker mutexLocker(&m_mutex);
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if (calculateRemainder() == 0)
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{
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*dataBlock = nullptr;
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return 0;
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}
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else
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{
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*dataBlock = &m_data[m_readHead];
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m_readHead = m_readHead < m_size - 1 ? m_readHead + 1 : 0;
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return calculateRemainder();
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}
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}
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unsigned int RemoteSinkFifo::getRemainder()
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{
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QMutexLocker mutexLocker(&m_mutex);
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return calculateRemainder();
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}
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unsigned int RemoteSinkFifo::calculateRemainder()
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{
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if (m_readHead <= m_servedHead) {
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return m_servedHead - m_readHead;
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} else {
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return m_size - (m_readHead - m_servedHead);
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}
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} |