feat: SchemaChecker & V4L2 enhancement (#734)

* libjpeg-turbo, QJsonSchemaChecker, V4L2 width/height/fps

Signed-off-by: Paulchen-Panther <Paulchen-Panter@protonmail.com>

* Implement hyperion-v4l cli args

* Apply v4l2 settings during runtime

* feat: Provide minimum values for input restriction

* fix: merge mess

Co-authored-by: brindosch <edeltraud70@gmx.de>

include/grabber/V4L2Grabber.h

@@ -15,13 +15,23 @@
 #include <grabber/VideoStandard.h>
 #include <utils/Components.h>
 
-#ifdef HAVE_JPEG
+// general JPEG decoder includes
+#ifdef HAVE_JPEG_DECODER
 	#include <QImage>
 	#include <QColor>
+#endif
+
+// System JPEG decoder
+#ifdef HAVE_JPEG
 	#include <jpeglib.h>
 	#include <csetjmp>
 #endif
 
+// TurboJPEG decoder
+#ifdef HAVE_TURBO_JPEG
+	#include <turbojpeg.h>
+#endif
+
 /// Capture class for V4L2 devices
 ///
 /// @see http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html
@@ -31,6 +41,9 @@ class V4L2Grabber : public Grabber
 
 public:
 	V4L2Grabber(const QString & device,
+			const unsigned width,
+			const unsigned height,
+			const unsigned fps,
 			VideoStandard videoStandard,
 			PixelFormat pixelFormat,
 			int pixelDecimation
@@ -46,11 +59,6 @@ public:
 
 	int grabFrame(Image<ColorRgb> &);
 
-	///
-	/// @brief  overwrite Grabber.h implementation, as v4l doesn't use width/height
-	///
-	virtual void setWidthHeight(){};
-
 	///
 	/// @brief  set new PixelDecimation value to ImageResampler
 	/// @param  pixelDecimation  The new pixelDecimation value
@@ -84,6 +92,16 @@ public:
 	/// 
 	virtual void setDeviceVideoStandard(QString device, VideoStandard videoStandard);
 
+	///
+	/// @brief overwrite Grabber.h implementation
+	/// 
+	virtual bool setFramerate(int fps);
+
+	///
+	/// @brief overwrite Grabber.h implementation
+	///
+	virtual bool setWidthHeight(int width, int height);
+
 public slots:
 
 	bool start();
@@ -173,6 +191,11 @@ private:
 	errorManager* _error;
 #endif
 
+#ifdef HAVE_TURBO_JPEG
+	tjhandle _decompress = nullptr;
+	int _subsamp;
+#endif
+
 private:
 	QString _deviceName;
 	std::map<QString,QString> _v4lDevices;

include/grabber/V4L2Wrapper.h

@@ -9,6 +9,9 @@ class V4L2Wrapper : public GrabberWrapper
 
 public:
 	V4L2Wrapper(const QString & device,
+			const unsigned grabWidth,
+			const unsigned grabHeight,
+			const unsigned fps,
 			VideoStandard videoStandard,
 			PixelFormat pixelFormat,
 			int pixelDecimation );

include/hyperion/Grabber.h

@@ -40,6 +40,12 @@ public:
 	///
 	virtual bool setWidthHeight(int width, int height);
 
+	///
+	/// @brief Apply new framerate (used from v4l)
+	/// @param fps  framesPerSecond
+	///
+	virtual bool setFramerate(int fps);
+
 	///
 	/// @brief Apply new pixelDecimation (used from x11 and qt)
 	///
@@ -111,6 +117,8 @@ protected:
 	/// Height of the captured snapshot [pixels]
 	int _height;
 
+	int _fps;
+
 	// number of pixels to crop after capturing
 	int _cropLeft, _cropRight, _cropTop, _cropBottom;
 

include/utils/PixelFormat.h

@@ -12,7 +12,7 @@ enum PixelFormat {
 	PIXELFORMAT_BGR24,
 	PIXELFORMAT_RGB32,
 	PIXELFORMAT_BGR32,
-#ifdef HAVE_JPEG
+#ifdef HAVE_JPEG_DECODER
 	PIXELFORMAT_MJPEG,
 #endif
 	PIXELFORMAT_NO_CHANGE
@@ -47,7 +47,7 @@ inline PixelFormat parsePixelFormat(QString pixelFormat)
 	{
 		return PIXELFORMAT_BGR32;
 	}
-#ifdef HAVE_JPEG
+#ifdef HAVE_JPEG_DECODER
 	else if (pixelFormat == "mjpeg")
 	{
 		return PIXELFORMAT_MJPEG;

include/utils/jsonschema/QJsonSchemaChecker.h

@@ -187,6 +187,14 @@ private:
 	///
 	void checkEnum(const QJsonValue & value, const QJsonValue & schema, const QJsonValue & defaultValue);
 
+	///
+	/// @brief Return the "default" value as string. If not found, an empty string is output
+	///
+	/// @param value The JSON value to search
+	/// @return The "default" value as string
+	///
+	QString getDefaultValue(const QJsonValue & value);
+
 private:
 	/// The schema of the entire json-configuration
 	QJsonObject _qSchema;

include/utils/jsonschema/QJsonUtils.h

@@ -41,6 +41,37 @@ public:
 		return createValue(schema, ignoreRequired);
 	}
 
+	static QString getDefaultValue(const QJsonValue & value)
+	{
+		QString ret;
+		switch (value.type())
+		{
+			case QJsonValue::Array:
+			{
+				for (const QJsonValue &v : value.toArray())
+				{
+					ret = getDefaultValue(v);
+					if (!ret.isEmpty())
+						break;
+				}
+				break;
+			}
+			case QJsonValue::Object:
+				ret = getDefaultValue(value.toObject().find("default").value());
+				break;
+			case QJsonValue::Bool:
+				return value.toBool() ? "True" : "False";
+			case QJsonValue::Double:
+				return QString::number(value.toDouble());
+			case QJsonValue::String:
+				return value.toString();
+			case QJsonValue::Null:
+			case QJsonValue::Undefined:
+				break;
+		}
+		return ret;
+	}
+
 private:
 
 	static QJsonValue createValue(QJsonValue schema, bool ignoreRequired)