Media_Scaler Class Reference

SwsContext wrapper - tool performing image scaling and pixel format conversion. More...

#include <Media_Scaler.hxx>

Inheritance diagram for Media_Scaler:

Public Member Functions
	Media_Scaler ()
	Empty constructor.
	~Media_Scaler () override
	Destructor.
void	Release ()
	sws_freeContext() wrapper.
bool	Init (const NCollection_Vec2< int > &theSrcDims, int theSrcFormat, const NCollection_Vec2< int > &theResDims, int theResFormat)
	sws_getContext() wrapper - creates conversion context.
bool	Convert (const occ::handle< Media_Frame > &theSrc, const occ::handle< Media_Frame > &theRes)
	Convert one frame to another.
bool	IsValid () const
	Return TRUE if context was initialized.
Public Member Functions inherited from Standard_Transient
	Standard_Transient ()
	Empty constructor.
	Standard_Transient (const Standard_Transient &)
	Copy constructor – does nothing.
Standard_Transient &	operator= (const Standard_Transient &)
	Assignment operator, needed to avoid copying reference counter.
virtual	~Standard_Transient ()=default
	Destructor must be virtual.
virtual const opencascade::handle< Standard_Type > &	DynamicType () const
	Returns a type descriptor about this object.
bool	IsInstance (const opencascade::handle< Standard_Type > &theType) const
	Returns a true value if this is an instance of Type.
bool	IsInstance (const char *const theTypeName) const
	Returns a true value if this is an instance of TypeName.
bool	IsKind (const opencascade::handle< Standard_Type > &theType) const
	Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism.
bool	IsKind (const char *const theTypeName) const
	Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism.
Standard_Transient *	This () const
	Returns non-const pointer to this object (like const_cast). For protection against creating handle to objects allocated in stack or call from constructor, it will raise exception Standard_ProgramError if reference counter is zero.
int	GetRefCount () const noexcept
	Get the reference counter of this object.
void	IncrementRefCounter () noexcept
	Increments the reference counter of this object. Uses relaxed memory ordering since incrementing only requires atomicity, not synchronization with other memory operations.
int	DecrementRefCounter () noexcept
	Decrements the reference counter of this object; returns the decremented value. Uses release ordering for the decrement to ensure all writes to the object are visible before the count reaches zero. An acquire fence is added only when the count reaches zero, ensuring proper synchronization before deletion. This is more efficient than using acq_rel for every decrement.
virtual void	Delete () const
	Memory deallocator for transient classes.

Protected Attributes
SwsContext *	mySwsContext
	conversion context
NCollection_Vec2< int >	mySrcDims
	dimensions of input frame
int	mySrcFormat
	pixel format (AVPixelFormat) of input frame
NCollection_Vec2< int >	myResDims
	dimensions of destination frame
int	myResFormat
	pixel format (AVPixelFormat) of destination frame

Additional Inherited Members
Public Types inherited from Standard_Transient
typedef void	base_type
	Returns a type descriptor about this object.
Static Public Member Functions inherited from Standard_Transient
static constexpr const char *	get_type_name ()
	Returns a type descriptor about this object.
static const opencascade::handle< Standard_Type > &	get_type_descriptor ()
	Returns type descriptor of Standard_Transient class.

Detailed Description

SwsContext wrapper - tool performing image scaling and pixel format conversion.

Constructor & Destructor Documentation

Media_Scaler()

Media_Scaler::Media_Scaler

(

)

Empty constructor.

~Media_Scaler()

Media_Scaler::~Media_Scaler ( )

override

Destructor.

Member Function Documentation

Convert()

bool Media_Scaler::Convert	(	const occ::handle< Media_Frame > &	theSrc,
		const occ::handle< Media_Frame > &	theRes )

Convert one frame to another.

Init()

bool Media_Scaler::Init	(	const NCollection_Vec2< int > &	theSrcDims,
		int	theSrcFormat,
		const NCollection_Vec2< int > &	theResDims,
		int	theResFormat )

sws_getContext() wrapper - creates conversion context.

Parameters

theSrcDims	dimensions of input frame
theSrcFormat	pixel format (AVPixelFormat) of input frame
theResDims	dimensions of destination frame
theResFormat	pixel format (AVPixelFormat) of destination frame

IsValid()

bool Media_Scaler::IsValid ( ) const

inline

Return TRUE if context was initialized.

Release()

void Media_Scaler::Release

(

)

sws_freeContext() wrapper.

Field Documentation

myResDims

NCollection_Vec2<int> Media_Scaler::myResDims

protected

dimensions of destination frame

myResFormat

int Media_Scaler::myResFormat

protected

pixel format (AVPixelFormat) of destination frame

mySrcDims

NCollection_Vec2<int> Media_Scaler::mySrcDims

protected

dimensions of input frame

mySrcFormat

int Media_Scaler::mySrcFormat

protected

pixel format (AVPixelFormat) of input frame

mySwsContext

SwsContext* Media_Scaler::mySwsContext

protected

conversion context

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

• Media_Scaler.hxx