Create image callback using Qt signal

Former-commit-id: cf469ba01ffd26d286e6fb8d9f081cf126042e50

include/grabber/V4L2Grabber.h

@@ -4,26 +4,27 @@
 #include <string>
 #include <vector>
 
+// Qt includes
+#include <QObject>
+#include <QSocketNotifier>
+
 // util includes
 #include <utils/Image.h>
 #include <utils/ColorRgb.h>
+#include <utils/VideoMode.h>
 
 /// Capture class for V4L2 devices
 ///
 /// @see http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html
-class V4L2Grabber
+class V4L2Grabber : public QObject
 {
-public:
-	typedef void (*ImageCallback)(void * arg, const Image<ColorRgb> & image);
+	Q_OBJECT
 
+public:
 	enum VideoStandard {
 		PAL, NTSC, NO_CHANGE
 	};
 
-	enum Mode3D {
-		MODE_NONE, MODE_3DSBS, MODE_3DTAB
-	};
-
 public:
 	V4L2Grabber(
 			const std::string & device,
@@ -36,21 +37,24 @@ public:
 			int verticalPixelDecimation);
 	virtual ~V4L2Grabber();
 
+public slots:
 	void setCropping(int cropLeft,
 					 int cropRight,
 					 int cropTop,
 					 int cropBottom);
 
-	void set3D(Mode3D mode);
-
-	void setCallback(ImageCallback callback, void * arg);
+	void set3D(VideoMode mode);
 
 	void start();
 
-	void capture(int frameCount = -1);
-
 	void stop();
 
+signals:
+	void newFrame(const Image<ColorRgb> & image);
+
+private slots:
+	int read_frame();
+
 private:
 	void open_device();
 
@@ -70,8 +74,6 @@ private:
 
 	void stop_capturing();
 
-	int read_frame();
-
 	bool process_image(const void *p, int size);
 
 	void process_image(const uint8_t *p);
@@ -111,10 +113,9 @@ private:
 	int _horizontalPixelDecimation;
 	int _verticalPixelDecimation;
 
-	Mode3D _mode3D;
+	VideoMode _mode3D;
 
 	int _currentFrame;
 
-	ImageCallback _callback;
-	void * _callbackArg;
+	QSocketNotifier * _streamNotifier;
 };