cv::v4d Namespace Reference

Namespaces
namespace	detail
namespace	nvg

Classes
class	Plan
class	Sink
class	Source
class	Transaction
class	V4D

Enumerations
enum	AllocateFlags {   NONE = 0 ,   NANOVG = 1 ,   IMGUI = 2 ,   ALL = NANOVG | IMGUI }

Functions
cv::Scalar	colorConvert (const cv::Scalar &src, cv::ColorConversionCodes code)
std::string	getClInfo ()
std::string	getGlInfo ()
std::string	getGlVendor ()
void	gl_check_error (const std::filesystem::path &file, unsigned int line, const char *expression)
unsigned int	initShader (const char *vShader, const char *fShader, const char *outputAttributeName)
bool	isClGlSharingSupported ()
bool	isIntelVaSupported ()
bool	keepRunning ()
template<typename F , typename... Args>
cv::Ptr< Transaction >	make_transaction (F f, Args &&... args)
template<typename F , typename Tfb , typename... Args>
cv::Ptr< Transaction >	make_transaction (F f, Tfb &&fb, Args &&... args)
cv::Ptr< Source >	makeCaptureSource (cv::Ptr< V4D > window, const string &inputFilename)
cv::Ptr< Sink >	makeVaSink (cv::Ptr< V4D > window, const string &outputFilename, const int fourcc, const float fps, const cv::Size &frameSize, const int vaDeviceIndex)
cv::Ptr< Source >	makeVaSource (cv::Ptr< V4D > window, const string &inputFilename, const int vaDeviceIndex)
cv::Ptr< Sink >	makeWriterSink (cv::Ptr< V4D > window, const string &outputFilename, const float fps, const cv::Size &frameSize)
cv::Ptr< Sink >	makeWriterSink (cv::Ptr< V4D > window, const string &outputFilename, const float fps, const cv::Size &frameSize, const int fourcc)
void	resizePreserveAspectRatio (const cv::UMat &src, cv::UMat &output, const cv::Size &dstSize, const cv::Scalar &bgcolor={0, 0, 0, 255})

Detailed Description

V4D namespace

Enumeration Type Documentation

AllocateFlags

enum cv::v4d::AllocateFlags

Enumerator
NONE
NANOVG
IMGUI
ALL

Function Documentation

colorConvert()

cv::Scalar cv::v4d::colorConvert	(	const cv::Scalar &	src,
		cv::ColorConversionCodes	code
	)

Convenience function to color convert from Scalar to Scalar

Parameters

src	The scalar to color convert
code	The color converions code

Returns

The color converted scalar

getClInfo()

std::string cv::v4d::getClInfo

(

)

Returns the OpenCL Version information.

Returns

a string object with the OpenCL version information

getGlInfo()

std::string cv::v4d::getGlInfo

(

)

Returns the OpenGL Version information.

Returns

a string object with the OpenGL version information

getGlVendor()

std::string cv::v4d::getGlVendor

(

)

Returns the OpenGL vendor string

Returns

a string object with the OpenGL vendor information

gl_check_error()

void cv::v4d::gl_check_error	(	const std::filesystem::path &	file,
		unsigned int	line,
		const char *	expression
	)

Convenience function to check for OpenGL errors. Should only be used via the macro GL_CHECK.

Parameters

file	The file path of the error.
line	The file line of the error.
expression	The expression that failed.

initShader()

unsigned int cv::v4d::initShader	(	const char *	vShader,
		const char *	fShader,
		const char *	outputAttributeName
	)

isClGlSharingSupported()

bool cv::v4d::isClGlSharingSupported

(

)

Determines if cl_khr_gl_sharing is supported

Returns

true if it is supported

isIntelVaSupported()

bool cv::v4d::isIntelVaSupported

(

)

Determines if Intel VAAPI is supported

Returns

true if it is supported

keepRunning()

bool cv::v4d::keepRunning

(

)

Tells the application if it's alright to keep on running. Note: If you use this mechanism signal handlers are installed

Returns

true if the program should keep on running

make_transaction() [1/2]

template<typename F , typename... Args>

cv::Ptr< Transaction > cv::v4d::make_transaction	(	F	f,
		Args &&...	args
	)

make_transaction() [2/2]

template<typename F , typename Tfb , typename... Args>

cv::Ptr< Transaction > cv::v4d::make_transaction	(	F	f,
		Tfb &&	fb,
		Args &&...	args
	)

makeCaptureSource()

cv::Ptr< Source > cv::v4d::makeCaptureSource	(	cv::Ptr< V4D >	window,
		const string &	inputFilename
	)

Creates a VideoCapture source object to use in conjunction with V4D::setSource(). This function automatically determines if Intel VAAPI is available and enables it if so.

Parameters

inputFilename

The file to read from.

Returns

A (optionally VAAPI enabled) VideoCapture enabled source object.

makeVaSink()

cv::Ptr< Sink > cv::v4d::makeVaSink	(	cv::Ptr< V4D >	window,
		const string &	outputFilename,
		const int	fourcc,
		const float	fps,
		const cv::Size &	frameSize,
		const int	vaDeviceIndex
	)

Creates an Intel VAAPI enabled VideoWriter sink object to use in conjunction with V4D::setSink(). Usually you would call makeWriterSink() and let it automatically decide if VAAPI is available.

Parameters

outputFilename	The filename to write the video to.
fourcc	The fourcc code of the codec to use.
fps	The fps of the target video.
frameSize	The frame size of the target video.
vaDeviceIndex	The VAAPI device index to use.

Returns

A VAAPI enabled sink object.

makeVaSource()

cv::Ptr< Source > cv::v4d::makeVaSource	(	cv::Ptr< V4D >	window,
		const string &	inputFilename,
		const int	vaDeviceIndex
	)

Creates an Intel VAAPI enabled VideoCapture source object to use in conjunction with V4D::setSource(). Usually you would call makeCaptureSource() and let it automatically decide if VAAPI is available.

Parameters

inputFilename	The file to read from.
vaDeviceIndex	The VAAPI device index to use.

Returns

A VAAPI enabled source object.

makeWriterSink() [1/2]

cv::Ptr< Sink > cv::v4d::makeWriterSink	(	cv::Ptr< V4D >	window,
		const string &	outputFilename,
		const float	fps,
		const cv::Size &	frameSize
	)

Creates a VideoWriter sink object to use in conjunction with V4D::setSink(). This function automatically determines if Intel VAAPI is available and enables it if so.

Parameters

outputFilename	The filename to write the video to.
fourcc	The fourcc code of the codec to use.
fps	The fps of the target video.
frameSize	The frame size of the target video.

Returns

A (optionally VAAPI enabled) VideoWriter sink object.

makeWriterSink() [2/2]

cv::Ptr< Sink > cv::v4d::makeWriterSink	(	cv::Ptr< V4D >	window,
		const string &	outputFilename,
		const float	fps,
		const cv::Size &	frameSize,
		const int	fourcc
	)

resizePreserveAspectRatio()

void cv::v4d::resizePreserveAspectRatio	(	const cv::UMat &	src,
		cv::UMat &	output,
		const cv::Size &	dstSize,
		const cv::Scalar &	bgcolor = {0, 0, 0, 255}
	)