Adds parametetrization and default values

uvcengine/uvccamerasession.h

@@ -19,6 +19,7 @@
 
 #include <vector>
 #include <atomic>
+#include <map>
 
 #include "libuvc/libuvc.h"
 
@@ -27,6 +28,27 @@ QT_BEGIN_NAMESPACE
 // Maximum acceptable latency for calling the surface present method
 #define MAX_LATENCY_MS 1.0e3/25
 
+struct DefaultParameters {
+	double bandwidthFactor;
+	double brightness;
+	double contrast;
+	double saturation;
+	double white_balance;
+	double sharpness;
+	double backlight_compensation;
+	double gamma;
+	double gain;
+	double exposure_abs;
+	double hue;
+	int ae_mode;
+	int ae_priority;
+	int contrast_auto;
+	int focus_auto;
+	int white_balance_component_auto;
+	int white_balance_temperature_auto;
+	int hue_auto;
+};
+
 class UVCCameraSession : public QObject
 {
     Q_OBJECT
@@ -56,6 +78,8 @@ public:
 	double interval;
 
 	// Image Processing
+	// TODO: we don't check if the camera supports the parameters since some
+	// cameras underreport their capabilities; is this safe?
 	template<typename T>
 	QVariant uvc_get( uvc_device_handle_t *devh,
 					  uvc_error_t (*get)( uvc_device_handle_t *, T *, enum uvc_req_code)
@@ -64,10 +88,17 @@ public:
 		get(devh, &mn,  UVC_GET_MIN);
 		get(devh, &val, UVC_GET_CUR);
 		get(devh, &mx,  UVC_GET_MAX);
-		//qDebug() << mn << val << mx;
 		return (val - mn) / (double) (mx - mn) ;
 	}
 	template<typename T>
+	QVariant uvc_get_mode( uvc_device_handle_t *devh,
+					  uvc_error_t (*get)( uvc_device_handle_t *, T *, enum uvc_req_code)
+					  ) const {
+		T val;
+		get(devh, &val, UVC_GET_CUR);
+		return val;
+	}
+	template<typename T>
 	void uvc_set( uvc_device_handle_t *devh,
 					  uvc_error_t (*set)( uvc_device_handle_t *, T),
 					  QVariant val,
@@ -78,9 +109,15 @@ public:
 		get(devh, &mx,  UVC_GET_MAX);
 		double value = val.toDouble();
 		value = value * (mx - mn ) + mn;
-		//qDebug() << val;
 		set(devh, static_cast<T>(value));
 	}
+	template<typename T>
+	void uvc_set_mode( uvc_device_handle_t *devh,
+					  uvc_error_t (*set)( uvc_device_handle_t *, T),
+					  QVariant val
+					  ) {
+		set(devh, static_cast<T>(val.toInt()));
+	}
 
 	// Image Processing
 	bool isImageProcessingParameterSupported(QCameraImageProcessingControl::ProcessingParameter parameter) const;
@@ -101,7 +138,7 @@ private Q_SLOTS:
     void presentFrame(QVideoFrame frame, const qreal t);
 
 private:
-    float bandwidthFactor;
+	double bandwidthFactor;
     QCamera::Status m_status;
     QAbstractVideoSurface *m_surface;
 	QMutex surfaceMutex;
@@ -132,6 +169,9 @@ private:
 	static QMutex UVCCameraSession::devicesMutex;
 	bool acquire(const QString &device);
 	void release(const QString &device);
+
+	std::map<QString,DefaultParameters> defaults;
+	void setDefaultParameters();
 };
 
 QT_END_NAMESPACE