/*

* Copyright (c) 2007-2010 Sebastian Brannstrom, Lars Persson, EmbedDev AB

*

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:

* EmbedDev AB - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#ifndef SOUND_ENGINE_H

#define SOUND_ENGINE_H

#include <e32base.h>

class CPodcastModel;

const TInt KVolumeSteps = 10;

enum TSoundEngineState

{

	ESoundEngineNotInitialized,

	ESoundEngineOpening,

	ESoundEnginePlaying,

	ESoundEnginePaused,

	ESoundEngineStopped

};

class MSoundEngineObserver

{

public:

	virtual void PlaybackInitializedL() = 0;

	virtual void PlaybackStartedL() = 0;

	virtual void PlaybackStoppedL() = 0;

	virtual void VolumeChanged(TUint aVolume, TUint aMaxVolume) = 0;

};

/**

 * This class handles all playback and audio associated resources that the application/client needs

 */

class CSoundEngine : public CBase

{

public:

	static CSoundEngine* NewL(CPodcastModel& aPodcastModel);

	~CSoundEngine();

	void OpenFileL(const TDesC& aFileName, TBool aPlayOnInit);

	IMPORT_C void Play();

	IMPORT_C void Stop(TBool aMarkPlayed=ETrue);

	IMPORT_C TTimeIntervalMicroSeconds Position();

	IMPORT_C void SetPosition(TUint aPos);

	IMPORT_C void Pause(TBool aOverrideState = EFalse);

	IMPORT_C TSoundEngineState State();

	IMPORT_C void AddObserver(MSoundEngineObserver* aObserver);

	void RemoveObserver(MSoundEngineObserver* aObserver);

	const TFileName& LastFileName();

private:

	void NotifyPlaybackStarted();

	void NotifyPlaybackStopped();

	void NotifyPlaybackInitialized();

	void NotifyVolumeChanged();

protected:

	CSoundEngine(CPodcastModel& aPodcastModel);

	void ConstructL();	

private:    

	CPodcastModel& iPodcastModel;

	TSoundEngineState iState;

	RArray<MSoundEngineObserver*> iObservers;

	TFileName	iLastOpenedFileName;

	TBool iPlayOnInit;

	TTimeIntervalMicroSeconds iMaxPos;

};

#endif // SOUND_ENGINE_H