sdrangel/plugins/channelrx/remotesink/remotesinkfifo.cpp

95 wiersze
2.8 KiB
C++
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2019-12-11 22:19:22 +00:00
///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2019 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 "remotesinkfifo.h"
RemoteSinkFifo::RemoteSinkFifo(QObject *parent) :
QObject(parent)
{}
RemoteSinkFifo::RemoteSinkFifo(unsigned int size, QObject *parent) :
QObject(parent)
{
resize(size);
}
RemoteSinkFifo::~RemoteSinkFifo()
{}
void RemoteSinkFifo::resize(unsigned int size)
{
QMutexLocker mutexLocker(&m_mutex);
m_size = size;
m_data.resize(m_size);
m_readHead = 0;
m_servedHead = 0;
m_writeHead = 0;
}
void RemoteSinkFifo::reset()
{
m_readHead = 0;
m_servedHead = 0;
m_writeHead = 0;
}
RemoteDataBlock *RemoteSinkFifo::getDataBlock()
{
QMutexLocker mutexLocker(&m_mutex);
m_servedHead = m_writeHead;
if (m_writeHead < m_size - 1) {
m_writeHead++;
} else {
m_writeHead = 0;
}
emit dataBlockServed();
return &m_data[m_servedHead];
}
unsigned int RemoteSinkFifo::readDataBlock(RemoteDataBlock **dataBlock)
{
QMutexLocker mutexLocker(&m_mutex);
if (calculateRemainder() == 0)
{
*dataBlock = nullptr;
return 0;
}
else
{
*dataBlock = &m_data[m_readHead];
m_readHead = m_readHead < m_size - 1 ? m_readHead + 1 : 0;
return calculateRemainder();
}
}
unsigned int RemoteSinkFifo::getRemainder()
{
QMutexLocker mutexLocker(&m_mutex);
return calculateRemainder();
}
unsigned int RemoteSinkFifo::calculateRemainder()
{
if (m_readHead <= m_servedHead) {
return m_servedHead - m_readHead;
} else {
return m_size - (m_readHead - m_servedHead);
}
}