hyperion.ng/libsrc/leddevice/LedUdpDevice.cpp

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// STL includes
#include <cstring>
#include <cstdio>
#include <iostream>
#include <exception>
// Linux includes
#include <fcntl.h>
#include <sys/ioctl.h>
#include <QStringList>
#include <QUdpSocket>
#include <QHostInfo>
// Local Hyperion includes
#include "LedUdpDevice.h"
LedUdpDevice::LedUdpDevice(const std::string& output, const int latchTime_ns)
: _target(output)
, _LatchTime_ns(latchTime_ns)
{
_udpSocket = new QUdpSocket();
QString str = QString::fromStdString(_target);
QStringList str_splitted = str.split(":");
if (str_splitted.size() != 2)
{
throw("Error parsing hostname:port");
}
QHostInfo info = QHostInfo::fromName(str_splitted.at(0));
if (!info.addresses().isEmpty())
{
// use the first IP address
_address = info.addresses().first();
}
_port = str_splitted.at(1).toInt();
}
LedUdpDevice::~LedUdpDevice()
{
_udpSocket->close();
}
int LedUdpDevice::open()
{
QHostAddress localAddress = QHostAddress::Any;
quint16 localPort = 0;
WarningIf( !_udpSocket->bind(localAddress, localPort), _log, "Couldnt bind local address: %s", strerror(errno));
return 0;
}
int LedUdpDevice::writeBytes(const unsigned size, const uint8_t * data)
{
qint64 retVal = _udpSocket->writeDatagram((const char *)data,size,_address,_port);
if (retVal >= 0 && _LatchTime_ns > 0)
{
// The 'latch' time for latching the shifted-value into the leds
timespec latchTime;
latchTime.tv_sec = 0;
latchTime.tv_nsec = _LatchTime_ns;
// Sleep to latch the leds (only if write succesfull)
nanosleep(&latchTime, NULL);
}
else
{
Warning( _log, "Error sending: %s", strerror(errno));
}
return retVal;
}