hyperion.ng/src/hyperiond/hyperiond.cpp

#include <unistd.h>
#include <cassert>
#include <stdlib.h>

#include <QCoreApplication>
#include <QResource>
#include <QLocale>
#include <QFile>
#include <QHostInfo>
#include <QHostAddress>
#include <QString>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonValue>
#include <cstdint>
#include <limits>

#include "HyperionConfig.h"

#include <utils/jsonschema/JsonFactory.h> // DEPRECATED | Remove this only when the conversion have been completed from JsonCpp to QTJson
#include <utils/jsonschema/QJsonFactory.h>

#include <hyperion/Hyperion.h>
#include <effectengine/EffectEngine.h>
#include <bonjour/bonjourserviceregister.h>
#include <bonjour/bonjourrecord.h>
#include <jsonserver/JsonServer.h>
#include <protoserver/ProtoServer.h>
#include <boblightserver/BoblightServer.h>
#include <udplistener/UDPListener.h>

#include "hyperiond.h"


HyperionDaemon::HyperionDaemon(std::string configFile, QObject *parent)
	: QObject(parent)
	, _log(Logger::getInstance("MAIN"))
	, _kodiVideoChecker(nullptr)
	, _jsonServer(nullptr)
	, _protoServer(nullptr)
	, _boblightServer(nullptr)
	, _udpListener(nullptr)
	, _v4l2Grabber(nullptr)
	, _dispmanx(nullptr)
	, _x11Grabber(nullptr)
	, _amlGrabber(nullptr)
	, _fbGrabber(nullptr)
	, _osxGrabber(nullptr)
	, _hyperion(nullptr)
{
	loadConfig(configFile); // DEPRECATED | Remove this only when the conversion have been completed from JsonCpp to QTJson
	loadConfig(QString::fromStdString(configFile));
	
	_hyperion = Hyperion::initInstance(_config, configFile);
	
	if (Logger::getLogLevel() == Logger::WARNING)
	{
		if (_qconfig.contains("logger"))
		{
			const QJsonObject & logConfig = _qconfig["logger"].toObject();
			std::string level = logConfig["level"].toString("warn").toStdString(); // silent warn verbose debug
			if (level == "silent") Logger::setLogLevel(Logger::OFF);
			else if (level == "warn")    Logger::setLogLevel(Logger::WARNING);
			else if (level == "verbose") Logger::setLogLevel(Logger::INFO);
			else if (level == "debug")   Logger::setLogLevel(Logger::DEBUG);
			else Error(Logger::getInstance("LOGGER"), "log level '%s' used in config is unknown. valid: silent warn verbose debug", level.c_str());
			
		}
	}
	else
	{
		WarningIf(_qconfig.contains("logger"), Logger::getInstance("LOGGER"), "Logger settings overriden by command line argument");
	}
	
	Info(_log, "Hyperion started and initialised");
}

HyperionDaemon::~HyperionDaemon()
{
	delete _amlGrabber;
	delete _dispmanx;
	delete _fbGrabber;
	delete _osxGrabber;
	delete _v4l2Grabber;
	delete _kodiVideoChecker;
	delete _jsonServer;
	delete _protoServer;
	delete _boblightServer;
	delete _udpListener;
	delete _hyperion;

}

void HyperionDaemon::run()
{
	startInitialEffect();
	createKODIVideoChecker();

	// ---- network services -----
	startNetworkServices();

	// ---- grabber -----
	createGrabberV4L2();
	createSystemFrameGrabber();

	#if !defined(ENABLE_DISPMANX) && !defined(ENABLE_OSX) && !defined(ENABLE_FB) && !defined(ENABLE_X11) && !defined(ENABLE_AMLOGIC)
		WarningIf(_qconfig.contains("framegrabber"), _log, "No grabber can be instantiated, because all grabbers have been left out from the build");
	#endif

}

void HyperionDaemon::loadConfig(const std::string & configFile) // DEPRECATED | Remove this only when the conversion have been completed from JsonCpp to QTJson
{
	Info(_log, "Selected configuration file: %s", configFile.c_str() );
	// make sure the resources are loaded (they may be left out after static linking)
	Q_INIT_RESOURCE(resource);

	// read the json schema from the resource
	QResource schemaData(":/hyperion-schema");
	assert(schemaData.isValid());

	Json::Reader jsonReader;
	Json::Value schemaJson;
	if (!jsonReader.parse(reinterpret_cast<const char *>(schemaData.data()), reinterpret_cast<const char *>(schemaData.data()) + schemaData.size(), schemaJson, false))
	{
		throw std::runtime_error("ERROR: Json schema wrong: " + jsonReader.getFormattedErrorMessages())	;
	}
	JsonSchemaChecker schemaChecker;
	schemaChecker.setSchema(schemaJson);

	_config = JsonFactory::readJson(configFile);
	schemaChecker.validate(_config);
}

void HyperionDaemon::loadConfig(const QString & configFile)
{
//	Info(_log, "Selected configuration file: %s", configFile.toStdString().c_str()); // uncommend this line only if JsonCpp is removed. Otherwise appears this line twice in the debug output

	// make sure the resources are loaded (they may be left out after static linking)
	Q_INIT_RESOURCE(resource);
	QJsonParseError error;

	// read the json schema from the resource
	QFile schemaData(":/hyperion-schema");
	if (!schemaData.open(QIODevice::ReadOnly))
	{
		std::stringstream error;
		error << "Schema not found: " << schemaData.errorString().toStdString();
		throw std::runtime_error(error.str());
	}
	
	QByteArray schema = schemaData.readAll();
	QJsonDocument schemaJson = QJsonDocument::fromJson(schema, &error);
	
	if (error.error != QJsonParseError::NoError)
	{
		// report to the user the failure and their locations in the document.
		int errorLine(0), errorColumn(0);
		
		for( int i=0, count=qMin( error.offset,schema.size()); i<count; ++i )
		{
			++errorColumn;
			if(schema.at(i) == '\n' )
			{
				errorColumn = 0;
				++errorLine;
			}
		}
		
		std::stringstream sstream;
		sstream << "ERROR: Json schema wrong: " << error.errorString().toStdString() << " at Line: " << errorLine << ", Column: " << errorColumn;

		throw std::runtime_error(sstream.str());
	}

	QJsonSchemaChecker schemaChecker;
	schemaChecker.setSchema(schemaJson.object());

	_qconfig = QJsonFactory::readJson(configFile);
	if (!schemaChecker.validate(_qconfig))
	{
		for (std::list<std::string>::const_iterator i = schemaChecker.getMessages().begin(); i != schemaChecker.getMessages().end(); ++i)
		{
			std::cout << *i << std::endl;
		}
		
		throw std::runtime_error("ERROR: Json validation failed");
	}
}

void HyperionDaemon::startInitialEffect()
{
	Hyperion *hyperion = Hyperion::getInstance();

	// create boot sequence if the configuration is present
	if (_config.isMember("initialEffect"))
	{
		const Json::Value effectConfig = _config["initialEffect"];
		const int HIGHEST_PRIORITY = 0;
		const int DURATION_INFINITY = 0;
		const int LOWEST_PRIORITY = std::numeric_limits<int>::max()-1;

		// clear the leds
		hyperion->setColor(HIGHEST_PRIORITY, ColorRgb::BLACK, DURATION_INFINITY, false);

		// initial foreground effect/color
		const Json::Value fgEffectConfig = effectConfig["foreground-effect"];
		int default_fg_duration_ms = 3000;
		int fg_duration_ms = effectConfig.get("foreground-effect-duration_ms",default_fg_duration_ms).asUInt();
		if (fg_duration_ms == DURATION_INFINITY)
		{
			fg_duration_ms = default_fg_duration_ms;
			Warning(_log, "foreground effect duration 'infinity' is forbidden, set to default value %d ms",default_fg_duration_ms);
		}
		if ( ! fgEffectConfig.isNull() && fgEffectConfig.isArray() && fgEffectConfig.size() == 3 )
		{
			ColorRgb fg_color = {
				(uint8_t)fgEffectConfig[0].asUInt(),
				(uint8_t)fgEffectConfig[1].asUInt(),
				(uint8_t)fgEffectConfig[2].asUInt()
			};
			hyperion->setColor(HIGHEST_PRIORITY, fg_color, fg_duration_ms, false);
			Info(_log,"Inital foreground color set (%d %d %d)",fg_color.red,fg_color.green,fg_color.blue);
		}
		else if (! fgEffectConfig.isNull() && fgEffectConfig.isString())
		{
			const std::string bgEffectName = fgEffectConfig.asString();
			int result = effectConfig.isMember("foreground-effect-args")
			           ? hyperion->setEffect(bgEffectName, effectConfig["foreground-effect-args"], HIGHEST_PRIORITY, fg_duration_ms)
			           : hyperion->setEffect(bgEffectName, HIGHEST_PRIORITY, fg_duration_ms);
			Info(_log,"Inital foreground effect '%s' %s", bgEffectName.c_str(), ((result == 0) ? "started" : "failed"));
		}

		// initial background effect/color
		const Json::Value bgEffectConfig = effectConfig["background-effect"];
		if ( ! bgEffectConfig.isNull() && bgEffectConfig.isArray() && bgEffectConfig.size() == 3 )
		{
			ColorRgb bg_color = {
				(uint8_t)bgEffectConfig[0].asUInt(),
				(uint8_t)bgEffectConfig[1].asUInt(),
				(uint8_t)bgEffectConfig[2].asUInt()
			};
			hyperion->setColor(LOWEST_PRIORITY, bg_color, DURATION_INFINITY, false);
			Info(_log,"Inital background color set (%d %d %d)",bg_color.red,bg_color.green,bg_color.blue);
		}
		else if (! bgEffectConfig.isNull() && bgEffectConfig.isString())
		{
			const std::string bgEffectName = bgEffectConfig.asString();
			int result = effectConfig.isMember("background-effect-args")
			           ? hyperion->setEffect(bgEffectName, effectConfig["background-effect-args"], LOWEST_PRIORITY, DURATION_INFINITY)
			           : hyperion->setEffect(bgEffectName, LOWEST_PRIORITY, DURATION_INFINITY);
			Info(_log,"Inital background effect '%s' %s", bgEffectName.c_str(), ((result == 0) ? "started" : "failed"));
		}
	}
}


// create KODI video checker if the _configuration is present
void HyperionDaemon::createKODIVideoChecker()
{
	bool kodiCheckerConfigured = _qconfig.contains("kodiVideoChecker");

	const QJsonObject & videoCheckerConfig = _qconfig["kodiVideoChecker"].toObject();
	_kodiVideoChecker = KODIVideoChecker::initInstance(
		videoCheckerConfig["kodiAddress"].toString("127.0.0.1"),
		videoCheckerConfig["kodiTcpPort"].toInt(9090),
		videoCheckerConfig["grabVideo"].toBool(true),
		videoCheckerConfig["grabPictures"].toBool(true),
		videoCheckerConfig["grabAudio"].toBool(true),
		videoCheckerConfig["grabMenu"].toBool(false),
		videoCheckerConfig["grabPause"].toBool(true),
		videoCheckerConfig["grabScreensaver"].toBool(false),
		videoCheckerConfig["enable3DDetection"].toBool(true));
		Debug(_log, "KODI checker created ");

	if( kodiCheckerConfigured && videoCheckerConfig["enable"].toBool(true))
	{
		_kodiVideoChecker->start();
	}
}

void HyperionDaemon::startNetworkServices()
{
	KODIVideoChecker* kodiVideoChecker = KODIVideoChecker::getInstance();

	// Create Json server if configuration is present
	unsigned int jsonPort = 19444;
	if (_qconfig.contains("jsonServer"))
	{
		const QJsonObject & jsonServerConfig = _qconfig["jsonServer"].toObject();
		//jsonEnable = jsonServerConfig.get("enable", true).asBool();
		jsonPort   = jsonServerConfig["port"].toInt(jsonPort);
	}

	_jsonServer = new JsonServer(jsonPort);
	Info(_log, "Json server created and started on port %d", _jsonServer->getPort());

	// Create Proto server if configuration is present
	unsigned int protoPort = 19445;
	if (_qconfig.contains("protoServer"))
	{
		const QJsonObject & protoServerConfig = _qconfig["protoServer"].toObject();
		//protoEnable = protoServerConfig.get("enable", true).asBool();
		protoPort  = protoServerConfig["port"].toInt(protoPort);
	}

	_protoServer = new ProtoServer(protoPort);
	if (kodiVideoChecker != nullptr)
	{
		QObject::connect(kodiVideoChecker, SIGNAL(grabbingMode(GrabbingMode)), _protoServer, SIGNAL(grabbingMode(GrabbingMode)));
		QObject::connect(kodiVideoChecker, SIGNAL(videoMode(VideoMode)), _protoServer, SIGNAL(videoMode(VideoMode)));
	}
	Info(_log, "Proto server created and started on port %d", _protoServer->getPort());

	// Create Boblight server if configuration is present
	if (_qconfig.contains("boblightServer"))
	{
		const QJsonObject & boblightServerConfig = _qconfig["boblightServer"].toObject();
		_boblightServer = new BoblightServer(
			boblightServerConfig["priority"].toInt(710),
			boblightServerConfig["port"].toInt()
		);
		Debug(_log, "Boblight server created");

		if ( boblightServerConfig["enable"].toBool(true))
		{
			_boblightServer->start();
		}
	}

	// Create UDP listener if configuration is present
	if (_qconfig.contains("udpListener"))
	{
		const QJsonObject & udpListenerConfig = _qconfig["udpListener"].toObject();
		_udpListener = new UDPListener(
					udpListenerConfig["priority"].toInt(700),
					udpListenerConfig["timeout"].toInt(10000),
					udpListenerConfig["address"].toString(""),
					udpListenerConfig["port"].toInt(2801),
					udpListenerConfig["shared"].toBool(false));

		Debug(_log, "UDP listener created");

		if ( udpListenerConfig["enable"].toBool(true))
		{
			_udpListener->start();
		}
	}

	// zeroconf description - $leddevicename@$hostname
	const QJsonObject & deviceConfig = _qconfig["device"].toObject();
	const std::string mDNSDescr = ( deviceConfig["name"].toString("").toStdString()
					+ "@" +
					QHostInfo::localHostName().toStdString()
					);

	// zeroconf udp listener 
	if (_udpListener != nullptr) {
		BonjourServiceRegister *bonjourRegister_udp = new BonjourServiceRegister();
		bonjourRegister_udp->registerService(
					BonjourRecord(mDNSDescr.c_str(), "_hyperiond-rgbled._udp", QString()),
					_udpListener->getPort()
					);
		Debug(_log, "UDP LIstener mDNS responder started");
	}

	// zeroconf json
	BonjourServiceRegister *bonjourRegister_json = new BonjourServiceRegister();
	bonjourRegister_json->registerService( 
				BonjourRecord(mDNSDescr.c_str(), "_hyperiond-json._tcp", QString()),
				_jsonServer->getPort()
				);
	Debug(_log, "Json mDNS responder started");

	// zeroconf proto
	BonjourServiceRegister *bonjourRegister_proto = new BonjourServiceRegister();
	bonjourRegister_proto->registerService(
				BonjourRecord(mDNSDescr.c_str(), "_hyperiond-proto._tcp", QString()),
				_protoServer->getPort()
				);
	Debug(_log, "Proto mDNS responder started");
}


void HyperionDaemon::createSystemFrameGrabber()
{
	if (_qconfig.contains("framegrabber"))
	{
		const QJsonObject & grabberConfig = _qconfig["framegrabber"].toObject();
		if (grabberConfig["enable"].toBool(true))
		{
			_grabber_width     = grabberConfig["width"].toInt(96);
			_grabber_height    = grabberConfig["height"].toInt(96);
			_grabber_frequency = grabberConfig["frequency_Hz"].toInt(10);
			_grabber_priority  = grabberConfig["priority"].toInt(900);

			_grabber_cropLeft   = grabberConfig["cropLeft"].toInt(0);
			_grabber_cropRight  = grabberConfig["cropRight"].toInt(0);
			_grabber_cropTop    = grabberConfig["cropTop"].toInt(0);
			_grabber_cropBottom = grabberConfig["cropBottom"].toInt(0);

			#ifdef ENABLE_OSX
				QString type = "osx";
			#else
				QString type = grabberConfig["type"].toString("auto");
			#endif
				
			QFile amvideo("/dev/amvideo");
			// auto eval of type
			if ( type == "auto" )
			{
				// dispmanx -> on raspi
				// TODO currently a compile option
				#ifdef ENABLE_DISPMANX
				if (true)
				#else
				if (false)
				#endif
				{
					type = "dispmanx";
				}
				// amlogic -> /dev/amvideo exists
				else if ( amvideo.exists() )
				{
					type = "amlogic";
				}
				// x11 -> if DISPLAY is set
				else if (getenv("DISPLAY") != NULL ) 
				{
					type = "x11";
				}
				// framebuffer -> if nothing other applies
				else
				{
					type == "framebuffer";
				}
				Info(  _log, "set screen capture device to '%s'", type.constData());
			}
			
			if (type == "framebuffer")   createGrabberFramebuffer(grabberConfig);
			else if (type == "dispmanx") createGrabberDispmanx();
			else if (type == "amlogic")  { createGrabberAmlogic(); createGrabberFramebuffer(grabberConfig); }
			else if (type == "osx")      createGrabberOsx(grabberConfig);
			else if (type == "x11")      createGrabberX11(grabberConfig);
			else WarningIf( type != "", _log, "unknown framegrabber type '%s'", type.constData());
			InfoIf( type == "", _log, "screen capture device disabled");
		}
	}
}


void HyperionDaemon::createGrabberDispmanx()
{
#ifdef ENABLE_DISPMANX
	_dispmanx = new DispmanxWrapper(_grabber_width, _grabber_height, _grabber_frequency, _grabber_priority);
	_dispmanx->setCropping(_grabber_cropLeft, _grabber_cropRight, _grabber_cropTop, _grabber_cropBottom);

	QObject::connect(_kodiVideoChecker, SIGNAL(grabbingMode(GrabbingMode)), _dispmanx, SLOT(setGrabbingMode(GrabbingMode)));
	QObject::connect(_kodiVideoChecker, SIGNAL(videoMode(VideoMode)), _dispmanx, SLOT(setVideoMode(VideoMode)));
	QObject::connect(_dispmanx, SIGNAL(emitImage(int, const Image<ColorRgb>&, const int)), _protoServer, SLOT(sendImageToProtoSlaves(int, const Image<ColorRgb>&, const int)) );

	_dispmanx->start();
	Info(_log, "DISPMANX frame grabber created and started");
#else
	ErrorIf(_qconfig.contains("framegrabber"), _log, "The dispmanx framegrabber can not be instantiated, because it has been left out from the build");
#endif
}


void HyperionDaemon::createGrabberAmlogic()
{
#ifdef ENABLE_AMLOGIC
	_amlGrabber = new AmlogicWrapper(_grabber_width, _grabber_height, _grabber_frequency, _grabber_priority-1);

	QObject::connect(_kodiVideoChecker, SIGNAL(grabbingMode(GrabbingMode)), _amlGrabber, SLOT(setGrabbingMode(GrabbingMode)));
	QObject::connect(_kodiVideoChecker, SIGNAL(videoMode(VideoMode)),       _amlGrabber, SLOT(setVideoMode(VideoMode)));
	QObject::connect(_amlGrabber, SIGNAL(emitImage(int, const Image<ColorRgb>&, const int)), _protoServer, SLOT(sendImageToProtoSlaves(int, const Image<ColorRgb>&, const int)) );

	_amlGrabber->start();
	Info(_log, "AMLOGIC grabber created and started");
#else
	Error( _log, "The AMLOGIC grabber can not be instantiated, because it has been left out from the build");
#endif
}

void HyperionDaemon::createGrabberX11(const QJsonObject & grabberConfig)
{
#ifdef ENABLE_X11
	_x11Grabber = new X11Wrapper(
				grabberConfig["useXGetImage"].toBool(false),
				_grabber_cropLeft, _grabber_cropRight, _grabber_cropTop, _grabber_cropBottom,
				grabberConfig["horizontalPixelDecimation"].toInt(8),
				grabberConfig["verticalPixelDecimation"].toInt(8),
				_grabber_frequency, _grabber_priority );

	QObject::connect(_kodiVideoChecker, SIGNAL(grabbingMode(GrabbingMode)), _x11Grabber, SLOT(setGrabbingMode(GrabbingMode)));
	QObject::connect(_kodiVideoChecker, SIGNAL(videoMode(VideoMode)),       _x11Grabber, SLOT(setVideoMode(VideoMode)));
	QObject::connect(_x11Grabber, SIGNAL(emitImage(int, const Image<ColorRgb>&, const int)), _protoServer, SLOT(sendImageToProtoSlaves(int, const Image<ColorRgb>&, const int)) );

	_x11Grabber->start();
	Info(_log, "X11 grabber created and started");
#else
	Error(_log, "The X11 grabber can not be instantiated, because it has been left out from the build");
#endif
}


void HyperionDaemon::createGrabberFramebuffer(const QJsonObject & grabberConfig)
{
#ifdef ENABLE_FB
	// Construct and start the framebuffer grabber if the configuration is present
	_fbGrabber = new FramebufferWrapper(
				grabberConfig["device"].toString("/dev/fb0").toStdString(),
				_grabber_width, _grabber_height, _grabber_frequency, _grabber_priority);
	
	QObject::connect(_kodiVideoChecker, SIGNAL(grabbingMode(GrabbingMode)), _fbGrabber, SLOT(setGrabbingMode(GrabbingMode)));
	QObject::connect(_kodiVideoChecker, SIGNAL(videoMode(VideoMode)), _fbGrabber, SLOT(setVideoMode(VideoMode)));
	QObject::connect(_fbGrabber, SIGNAL(emitImage(int, const Image<ColorRgb>&, const int)), _protoServer, SLOT(sendImageToProtoSlaves(int, const Image<ColorRgb>&, const int)) );

	_fbGrabber->start();
	Info(_log, "Framebuffer grabber created and started");
#else
	Error(_log, "The framebuffer grabber can not be instantiated, because it has been left out from the build");
#endif
}


void HyperionDaemon::createGrabberOsx(const QJsonObject & grabberConfig)
{
#ifdef ENABLE_OSX
	// Construct and start the osx grabber if the configuration is present
	_osxGrabber = new OsxWrapper(
				grabberConfig["display"].toInt(0),
				_grabber_width, _grabber_height, _grabber_frequency, _grabber_priority);
	
	QObject::connect(_kodiVideoChecker, SIGNAL(grabbingMode(GrabbingMode)), _osxGrabber, SLOT(setGrabbingMode(GrabbingMode)));
	QObject::connect(_kodiVideoChecker, SIGNAL(videoMode(VideoMode)), _osxGrabber, SLOT(setVideoMode(VideoMode)));
	QObject::connect(_osxGrabber, SIGNAL(emitImage(int, const Image<ColorRgb>&, const int)), _protoServer, SLOT(sendImageToProtoSlaves(int, const Image<ColorRgb>&, const int)) );

	_osxGrabber->start();
	Info(_log, "OSX grabber created and started");
#else
	Error(_log, "The osx grabber can not be instantiated, because it has been left out from the build");
#endif
}


void HyperionDaemon::createGrabberV4L2()
{
	// construct and start the v4l2 grabber if the configuration is present
#ifdef ENABLE_V4L2
	if (_qconfig.contains("grabber-v4l2"))
	{
		const QJsonObject & grabberConfig = _qconfig["grabber-v4l2"].toObject();
			_v4l2Grabber = new V4L2Wrapper(
						grabberConfig["device"].toString("/dev/video0").toStdString(),
						grabberConfig["input"].toInt(0),
						parseVideoStandard(grabberConfig["standard"].toString("no-change").toStdString()),
						parsePixelFormat(grabberConfig["pixelFormat"].toString("no-change").toStdString()),
						grabberConfig["width"].toInt(-1),
						grabberConfig["height"].toInt(-1),
						grabberConfig["frameDecimation"].toInt(2),
						grabberConfig["sizeDecimation"].toInt(8),
						grabberConfig["redSignalThreshold"].toDouble(0.0),
						grabberConfig["greenSignalThreshold"].toDouble(0.0),
						grabberConfig["blueSignalThreshold"].toDouble(0.0),
						grabberConfig["priority"].toInt(890));
			_v4l2Grabber->set3D(parse3DMode(grabberConfig["mode"].toString("2D").toStdString()));
			_v4l2Grabber->setCropping(
						grabberConfig["cropLeft"].toInt(0),
						grabberConfig["cropRight"].toInt(0),
						grabberConfig["cropTop"].toInt(0),
						grabberConfig["cropBottom"].toInt(0));
			Debug(_log, "V4L2 grabber created");

		QObject::connect(_v4l2Grabber, SIGNAL(emitImage(int, const Image<ColorRgb>&, const int)), _protoServer, SLOT(sendImageToProtoSlaves(int, const Image<ColorRgb>&, const int)) );
		if (grabberConfig["enable"].toBool(true) && _v4l2Grabber->start())
		{
			Info(_log, "V4L2 grabber started");
		}
	}
#else
	ErrorIf(_qconfig.contains("grabber-v4l2"), _log, "The v4l2 grabber can not be instantiated, because it has been left out from the build");
#endif
}