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CMMFClockSourcePeriodicUtility Class Reference

class CMMFClockSourcePeriodicUtility : public CBase

Utility class that can be used by video HW devices to receive periodic callbacks with the current time. Note that the exact timing of the callbacks cannot be guaranteed due to other things pre-empting the execution of the active object or thread.

Inherits from

CMMFClockSourcePeriodicUtility
- CBase

Public Member Functions
	~CMMFClockSourcePeriodicUtility ()
IMPORT_C CMMFClockSourcePeriodicUtility *	NewL ( MMMFClockSource &, MMMFClockSourcePeriodicUtilityObserver &)
IMPORT_C void	Start ( TTimeIntervalMicroSeconds32 )
IMPORT_C void	Stop ()

Private Member Functions
	CMMFClockSourcePeriodicUtility ( MMMFClockSource &, MMMFClockSourcePeriodicUtilityObserver &)
TInt	Callback ( TAny *)
void	ConstructL ()
void	DoCallback ()

Inherited Functions
	CBase::CBase()
	CBase::Delete(CBase *)
	CBase::Extension_(TUint,TAny &,TAny )
	CBase::operator new(TUint)
	CBase::operator new(TUint,TAny *)
	CBase::operator new(TUint,TLeave)
	CBase::operator new(TUint,TLeave,TUint)
	CBase::operator new(TUint,TUint)
	CBase::~CBase()

Private Attributes
MMMFClockSource &	iClockSource
MMMFClockSourcePeriodicUtilityObserver &	iObserver
CPeriodic *	iTimer

Constructor & Destructor Documentation

CMMFClockSourcePeriodicUtility(MMMFClockSource &, MMMFClockSourcePeriodicUtilityObserver &)

CMMFClockSourcePeriodicUtility	(	MMMFClockSource &	aClockSource,
		MMMFClockSourcePeriodicUtilityObserver &	aObserver
	)	[private]

Parameters

MMMFClockSource & aClockSource
MMMFClockSourcePeriodicUtilityObserver & aObserver

~CMMFClockSourcePeriodicUtility()

IMPORT_C

~CMMFClockSourcePeriodicUtility

(

)

Destructor.

Member Functions Documentation

Callback(TAny *)

TInt

Callback

(

TAny *

aAny

)

[private, static]

Parameters

TAny * aAny

ConstructL()

void

ConstructL

(

)

[private]

DoCallback()

void

DoCallback

(

)

[private]

NewL(MMMFClockSource &, MMMFClockSourcePeriodicUtilityObserver &)

IMPORT_C CMMFClockSourcePeriodicUtility *	NewL	(	MMMFClockSource &	aClockSource,
			MMMFClockSourcePeriodicUtilityObserver &	aObserver
		)	[static]

Creates a new clock source periodic utility object.

leave: "The method will leave if an error occurs."

Parameters

MMMFClockSource & aClockSource	"A reference to the clock source to be used to query the current time."
MMMFClockSourcePeriodicUtilityObserver & aObserver	"A reference to the observer of the utility that will receive callbacks each time the specified period elapses."

Start(TTimeIntervalMicroSeconds32)

IMPORT_C void

Start

(

TTimeIntervalMicroSeconds32

aPeriod

)

Starts the clock source periodic utility. The utility will call MmcspuoTick on its observer every aPeriod microseconds until Stop() is called. Note that the utility will not stop automatically when the clock source is stopped.