Add support to set the threshold for each RGB channel separately

Former-commit-id: 5edb206bb2657e78f711f67625fd5f6164d8296c

include/grabber/V4L2Grabber.h

@@ -24,8 +24,7 @@ class V4L2Grabber : public QObject
 	Q_OBJECT
 
 public:
-	V4L2Grabber(
-			const std::string & device,
+	V4L2Grabber(const std::string & device,
 			int input,
 			VideoStandard videoStandard,
 			int width,
@@ -43,6 +42,11 @@ public slots:
 
 	void set3D(VideoMode mode);
 
+	void setSignalThreshold(double redSignalThreshold,
+					double greenSignalThreshold,
+					double blueSignalThreshold,
+					int noSignalCounterThreshold);
+
 	void start();
 
 	void stop();
@@ -110,10 +114,14 @@ private:
 	int _frameDecimation;
 	int _horizontalPixelDecimation;
 	int _verticalPixelDecimation;
+	int _noSignalCounterThreshold;
+
+	ColorRgb _noSignalThresholdColor;
 
 	VideoMode _mode3D;
 
 	int _currentFrame;
+	int _noSignalCounter;
 
 	QSocketNotifier * _streamNotifier;
 };

include/grabber/V4L2Wrapper.h

@@ -19,6 +19,9 @@ public:
 			int height,
 			int frameDecimation,
 			int pixelDecimation,
+			double redSignalThreshold,
+			double greenSignalThreshold,
+			double blueSignalThreshold,
 			Hyperion * hyperion,
 			int hyperionPriority);
 	virtual ~V4L2Wrapper();

include/utils/ColorRgb.h

@@ -48,3 +48,10 @@ inline std::ostream& operator<<(std::ostream& os, const ColorRgb& color)
 	os << "{" << unsigned(color.red) << "," << unsigned(color.green) << "," << unsigned(color.blue) << "}";
 	return os;
 }
+
+
+/// Compare operator to check if a color is 'smaller' than another color
+inline bool operator<(const ColorRgb & lhs, const ColorRgb & rhs)
+{
+	return (lhs.red < rhs.red) && (lhs.green < rhs.green) && (lhs.blue < rhs.blue);
+}