Simple class to read video frames from a movie file, decode them, and buffer them for smooth playback. More...

#include <jevoisbase/Components/Utilities/BufferedVideoReader.H>

Inheritance diagram for BufferedVideoReader:

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Collaboration diagram for BufferedVideoReader:

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Public Member Functions
	BufferedVideoReader (std::string const &instance, size_t bufsize=100)
	Constructor.

	~BufferedVideoReader ()
	Virtual destructor for safe inheritance.

cv::Mat	get ()
	Get the next frame as a BGR cv::Mat, or an empty cv::Mat when the movie is finished.

Public Member Functions inherited from jevois::Component
	Component (std::string const &instance)

virtual	~Component ()

std::shared_ptr< Comp >	addSubComponent (std::string const &instance, Args &&...args)

void	removeSubComponent (std::shared_ptr< Comp > &component)

void	removeSubComponent (std::string const &instance, bool warnIfNotFound=true)

std::shared_ptr< Comp >	getSubComponent (std::string const &instance) const

bool	isTopLevel () const

bool	initialized () const

std::string const &	className () const

std::string const &	instanceName () const

std::vector< std::string >	setParamVal (std::string const &paramdescriptor, T const &val)

void	setParamValUnique (std::string const &paramdescriptor, T const &val)

std::vector< std::pair< std::string, T > >	getParamVal (std::string const &paramdescriptor) const

T	getParamValUnique (std::string const &paramdescriptor) const

std::vector< std::string >	setParamString (std::string const &paramdescriptor, std::string const &val)

void	setParamStringUnique (std::string const &paramdescriptor, std::string const &val)

std::vector< std::pair< std::string, std::string > >	getParamString (std::string const &paramdescriptor) const

std::string	getParamStringUnique (std::string const &paramdescriptor) const

void	freezeParam (std::string const &paramdescriptor, bool doit)

void	freezeAllParams (bool doit)

std::string	descriptor () const

void	setParamsFromFile (std::string const &filename)

std::istream &	setParamsFromStream (std::istream &is, std::string const &absfile)

virtual void	paramInfo (std::shared_ptr< UserInterface > s, std::map< std::string, std::string > &categs, bool skipFrozen, std::string const &cname="", std::string const &pfx="")

void	foreachParam (std::function< void(std::string const &compname, ParameterBase *p)> func, std::string const &cname="")

std::shared_ptr< DynamicParameter< T > >	addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ParameterCategory const &category)

std::shared_ptr< DynamicParameter< T > >	addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ValidValuesSpec< T > const &validValuesSpec, ParameterCategory const &category)

void	setDynamicParameterCallback (std::string const &name, std::function< void(T const &)> cb, bool callnow=true)

void	removeDynamicParameter (std::string const &name, bool throw_if_not_found=true)

void	setPath (std::string const &path)

std::filesystem::path	absolutePath (std::filesystem::path const &path="")

std::shared_ptr< Comp >	addSubComponent (std::string const &instance, Args &&...args)

void	removeSubComponent (std::shared_ptr< Comp > &component)

void	removeSubComponent (std::string const &instance, bool warnIfNotFound=true)

std::shared_ptr< Comp >	getSubComponent (std::string const &instance) const

bool	isTopLevel () const

bool	initialized () const

std::string const &	className () const

std::string const &	instanceName () const

std::vector< std::string >	setParamVal (std::string const &paramdescriptor, T const &val)

void	setParamValUnique (std::string const &paramdescriptor, T const &val)

std::vector< std::pair< std::string, T > >	getParamVal (std::string const &paramdescriptor) const

T	getParamValUnique (std::string const &paramdescriptor) const

std::vector< std::string >	setParamString (std::string const &paramdescriptor, std::string const &val)

void	setParamStringUnique (std::string const &paramdescriptor, std::string const &val)

std::vector< std::pair< std::string, std::string > >	getParamString (std::string const &paramdescriptor) const

std::string	getParamStringUnique (std::string const &paramdescriptor) const

void	freezeParam (std::string const &paramdescriptor, bool doit)

void	freezeAllParams (bool doit)

std::string	descriptor () const

void	setParamsFromFile (std::string const &filename)

std::istream &	setParamsFromStream (std::istream &is, std::string const &absfile)

virtual void	paramInfo (std::shared_ptr< UserInterface > s, std::map< std::string, std::string > &categs, bool skipFrozen, std::string const &cname="", std::string const &pfx="")

void	foreachParam (std::function< void(std::string const &compname, ParameterBase *p)> func, std::string const &cname="")

std::shared_ptr< DynamicParameter< T > >	addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ParameterCategory const &category)

std::shared_ptr< DynamicParameter< T > >	addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ValidValuesSpec< T > const &validValuesSpec, ParameterCategory const &category)

void	setDynamicParameterCallback (std::string const &name, std::function< void(T const &)> cb, bool callnow=true)

void	removeDynamicParameter (std::string const &name, bool throw_if_not_found=true)

void	setPath (std::string const &path)

std::filesystem::path	absolutePath (std::filesystem::path const &path="")

Public Member Functions inherited from jevois::ParameterRegistry
virtual	~ParameterRegistry ()

Protected Member Functions
virtual void	postInit () override
	Start the thread that loads, decodes and pushes the frames into our buffer.

virtual void	postUninit () override
	Uninit, wait on our run thread and swallow any exception.

void	run ()
	Reader thread.

Protected Member Functions inherited from jevois::Component
virtual void	preInit ()

virtual void	preUninit ()

virtual void	preInit ()

virtual void	preUninit ()

Protected Member Functions inherited from jevois::ParameterRegistry
void	addParameter (ParameterBase *const param)

void	removeParameter (ParameterBase *const param)

void	callbackInitCall ()

Related Symbols
(Note that these are not member symbols.)
	JEVOIS_DECLARE_PARAMETER (filename, std::string, "Filename of video to read (if not absolute, will be assumed to be " "relative to Component path)", "movie.mpg", ParamCateg)
	Parameter.

Detailed Description

Simple class to read video frames from a movie file, decode them, and buffer them for smooth playback.

Reading and decoding is done in a thread, and decoded images are pushed into a producer/consumer queue. When the queue is full, decoding pauses until some images are popped off the queue by some other thread, for example to display them or to send them over USB link.

Definition at line 43 of file BufferedVideoReader.H.

Constructor & Destructor Documentation

◆ BufferedVideoReader()

BufferedVideoReader::BufferedVideoReader	(	std::string const &	instance,
		size_t	bufsize = `100`
	)

Constructor.

Definition at line 22 of file BufferedVideoReader.C.

◆ ~BufferedVideoReader()

BufferedVideoReader::~BufferedVideoReader ( )

Virtual destructor for safe inheritance.

Definition at line 27 of file BufferedVideoReader.C.

Member Function Documentation

◆ get()

cv::Mat BufferedVideoReader::get ( )

Get the next frame as a BGR cv::Mat, or an empty cv::Mat when the movie is finished.

Definition at line 57 of file BufferedVideoReader.C.

References jevois::BoundedBuffer< typename T, BlockingBehavior WhenFull, BlockingBehavior WhenEmpty >::pop().

◆ postInit()

void BufferedVideoReader::postInit ( )

overrideprotectedvirtual

Start the thread that loads, decodes and pushes the frames into our buffer.

Reimplemented from jevois::Component.

Definition at line 31 of file BufferedVideoReader.C.

References jevois::Component::absolutePath(), jevois::async(), jevois::BoundedBuffer< typename T, BlockingBehavior WhenFull, BlockingBehavior WhenEmpty >::filled_size(), LINFO, and run().

◆ postUninit()

void BufferedVideoReader::postUninit ( )

overrideprotectedvirtual

Uninit, wait on our run thread and swallow any exception.

Reimplemented from jevois::Component.

Definition at line 47 of file BufferedVideoReader.C.

References jevois::BoundedBuffer< typename T, BlockingBehavior WhenFull, BlockingBehavior WhenEmpty >::filled_size(), JEVOIS_WAIT_GET_FUTURE, and jevois::BoundedBuffer< typename T, BlockingBehavior WhenFull, BlockingBehavior WhenEmpty >::pop().

◆ run()

void BufferedVideoReader::run ( )

protected

Reader thread.

Definition at line 61 of file BufferedVideoReader.C.

References jevois::Component::absolutePath(), LERROR, and jevois::BoundedBuffer< typename T, BlockingBehavior WhenFull, BlockingBehavior WhenEmpty >::push().

Referenced by postInit().

Friends And Related Symbol Documentation

◆ JEVOIS_DECLARE_PARAMETER()

JEVOIS_DECLARE_PARAMETER	(	filename	,
		std::string	,
		"Filename of video to read (if not absolute, will be assumed to be " "relative to Component path)"	,
		"movie.mpg"	,
		ParamCateg
	)

The documentation for this class was generated from the following files:

include/jevoisbase/Components/Utilities/BufferedVideoReader.H
src/Components/Utilities/BufferedVideoReader.C

Public Member Functions

Protected Member Functions

Related Symbols