engine/inc/SoundEngine.h
changeset 2 29cda98b007e
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1:5f8e5adbbed9 2:29cda98b007e
       
     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