1 /*

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

     3 *

     4 * All rights reserved.

     5 * This component and the accompanying materials are made available

     6 * under the terms of the License "Eclipse Public License v1.0"

     7 * which accompanies this distribution, and is available

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

     9 *

    10 * Initial Contributors:

    11 * EmbedDev AB - initial contribution.

    12 *

    13 * Contributors:

    14 *

    15 * Description:

    16 *

    17 */

    18 

    19 #ifndef SOUND_ENGINE_H

    20 #define SOUND_ENGINE_H

    21 #include <e32base.h>

    22 

    23 class CPodcastModel;

    24 

    25 const TInt KVolumeSteps = 10;

    26 

    27 enum TSoundEngineState

    28 {

    29 	ESoundEngineNotInitialized,

    30 	ESoundEngineOpening,

    31 	ESoundEnginePlaying,

    32 	ESoundEnginePaused,

    33 	ESoundEngineStopped

    34 };

    35 

    36 class MSoundEngineObserver

    37 {

    38 public:

    39 	virtual void PlaybackInitializedL() = 0;

    40 	virtual void PlaybackStartedL() = 0;

    41 	virtual void PlaybackStoppedL() = 0;

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

    43 };

    44 

    45 

    46 /**

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

    48  */

    49 class CSoundEngine : public CBase

    50 {

    51 public:

    52 	static CSoundEngine* NewL(CPodcastModel& aPodcastModel);

    53 	~CSoundEngine();

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

    55 	IMPORT_C void Play();

    56 	IMPORT_C void Stop(TBool aMarkPlayed=ETrue);

    57 	IMPORT_C TTimeIntervalMicroSeconds Position();

    58 	IMPORT_C void SetPosition(TUint aPos);

    59 	

    60 	IMPORT_C void Pause(TBool aOverrideState = EFalse);

    61 

    62 	IMPORT_C TSoundEngineState State();

    63 	IMPORT_C void AddObserver(MSoundEngineObserver* aObserver);

    64 	void RemoveObserver(MSoundEngineObserver* aObserver);

    65 			

    66 	const TFileName& LastFileName();

    67 	

    68 private:

    69 	void NotifyPlaybackStarted();

    70 	void NotifyPlaybackStopped();

    71 	void NotifyPlaybackInitialized();

    72 	void NotifyVolumeChanged();

    73 	

    74 protected:

    75 	CSoundEngine(CPodcastModel& aPodcastModel);

    76 	void ConstructL();	

    77 	

    78 private:    

    79 	CPodcastModel& iPodcastModel;

    80 	TSoundEngineState iState;

    81 	RArray<MSoundEngineObserver*> iObservers;

    82 	TFileName	iLastOpenedFileName;

    83 	TBool iPlayOnInit;

    84 	TTimeIntervalMicroSeconds iMaxPos;

    85 };

    86 

    87 #endif // SOUND_ENGINE_H

    88