// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

#ifndef TAVSRCTIMER_H

#define TAVSRCTIMER_H

#include <e32base.h>

class CAdaptiveHighResPeriodic;

class MAdaptiveHighResPeriodicClient

	{

public:

	virtual void TimerEvent(CAdaptiveHighResPeriodic& aTimer)=0;

	virtual void TimerError(CAdaptiveHighResPeriodic& aTimer, TInt aError)=0;

	};

//adapts the callback to counter drift	

class CAdaptiveHighResPeriodic : public CTimer

	{

public:

	static CAdaptiveHighResPeriodic* NewL(MAdaptiveHighResPeriodicClient& aClient);

	~CAdaptiveHighResPeriodic();

	void Start(TTimeIntervalMicroSeconds32 aPeriod);

	void SetInterval(TTimeIntervalMicroSeconds32 aInterval);

private:

	CAdaptiveHighResPeriodic(MAdaptiveHighResPeriodicClient& aClient);

	void ConstructL();

	void RunL();

	TInt RunError(TInt aError);

	void StartTimer(TTimeIntervalMicroSeconds32 aInterval);

private:

	MAdaptiveHighResPeriodicClient& iClient;

	// HAL stuff

	TBool	iFastCounterIncreases;

	TInt	iFastCounterFreq;

	TReal	iFastCounterFreqUs;

	TReal	iExtraCounts;

	// what the client asked for in musecs

	TTimeIntervalMicroSeconds32	iInterval;

	TUint	iIntendedCountOnCallback ;	// the hoped for fast counter reading on callback

	};

#endif // TAVSRCTIMER_H