implement set videomode via json api (#457)

* implement set videomode via json api

* refactor grabbers:
- new base class
- move shared code to base class

* fix osx

* rework all cmakelist files with auto file collection. except leddevices (need further restructuring)

* store current video and grabbing mode

* add json stuff

* remove grabbingmode - we do not want to expose it

libsrc/grabber/v4l2/V4L2Grabber.cpp

@@ -33,15 +33,14 @@ V4L2Grabber::V4L2Grabber(const QString & device
 		, int horizontalPixelDecimation
 		, int verticalPixelDecimation
 		)
-	: _deviceName(device)
+	: Grabber("V4L2:"+device, width, height)
+	, _deviceName(device)
 	, _input(input)
 	, _videoStandard(videoStandard)
 	, _ioMethod(IO_METHOD_MMAP)
 	, _fileDescriptor(-1)
 	, _buffers()
 	, _pixelFormat(pixelFormat)
-	, _width(width)
-	, _height(height)
 	, _lineLength(-1)
 	, _frameByteSize(-1)
 	, _frameDecimation(qMax(1, frameDecimation))
@@ -56,8 +55,6 @@ V4L2Grabber::V4L2Grabber(const QString & device
 	, _y_frac_max(0.75)
 	, _currentFrame(0)
 	, _streamNotifier(nullptr)
-	, _imageResampler()
-	, _log(Logger::getInstance("V4L2:"+device))
 	, _initialized(false)
 	, _deviceAutoDiscoverEnabled(false)
 
@@ -188,11 +185,6 @@ void V4L2Grabber::setCropping(int cropLeft, int cropRight, int cropTop, int crop
 	_imageResampler.setCropping(cropLeft, cropRight, cropTop, cropBottom);
 }
 
-void V4L2Grabber::set3D(VideoMode mode)
-{
-	_imageResampler.set3D(mode);
-}
-
 void V4L2Grabber::setSignalThreshold(double redSignalThreshold, double greenSignalThreshold, double blueSignalThreshold, int noSignalCounterThreshold)
 {
 	_noSignalThresholdColor.red   = uint8_t(255*redSignalThreshold);