multimediacommscontroller/tsrc/mmfstub/inc/mmfaudiooutput.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:04:58 +0200
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/*
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* Copyright (c) 2002-2005 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  
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*
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*/
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#ifndef __MMF_AUDIOOUTPUT_H__
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#define __MMF_AUDIOOUTPUT_H__
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// Standard EPOC32 includes required by this header file
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#include <e32base.h>
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#include <e32std.h>
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#include <mmf/plugin/mmfaudioiointerfaceuids.hrh>
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#include <mmf/common/mmfpaniccodes.h>
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//DevSound
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#include <mmf/server/sounddevice.h>
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#include <mmf/common/mmfhelper.h>
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/** 
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@publishedAll
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@deprecated
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*/
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const TUint KAudioOutputDefaultFrameSize = 0x1000;
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void Panic(TInt aPanicCode);
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/**
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@publishedAll
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@released
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Interface class to allow dynamic linkage to CMMFAudioOutput.
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*/
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class MMMFAudioOutput : public MDataSink
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	{
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public:
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	//factory function
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	/**
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	Gets a new audio output object.
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	@param  aImplementationUid
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	        The implementation UID.
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	@param  aInitData
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	        The initialisation data.
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	@return The audio output object.
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	*/
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	inline static MMMFAudioOutput* NewAudioOutputL(TUid aImplementationUid, const TDesC8& aInitData);
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	//interface
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	/**
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	Returns the sound device.
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	Accessor function exposing public CMMFDevsound methods.
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	@return	A reference to a CMMFDevSound objector.
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	*/
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	virtual CMMFDevSound& SoundDevice() = 0;
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	/**
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	Returns the number of bytes played.
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	@return	The number of bytes played. If 16-bit divide this number returned by 2 to get word
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	        length.
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	*/
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	virtual TInt BytesPlayed() = 0;
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	/**
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	@deprecated
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	Gets audio from hardware device abstracted MMFDevsound (not used).
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	@param	aBuffer
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			The data to read in from a Hardware Device
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	@param	aSupplier
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			The MDataSink consuming the data contained in aBuffer.
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	*/
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	virtual void HWEmptyBufferL(CMMFBuffer* aBuffer, MDataSource* aSupplier)=0;//called by a EmptyBufferL if using HW codec
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protected:
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	//constructor
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	/**
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	Protected constructor.
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	*/
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	MMMFAudioOutput() : MDataSink(KUidMmfAudioOutput) {}
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	};
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inline MMMFAudioOutput* MMMFAudioOutput::NewAudioOutputL( TUid aImplementationUid,  const TDesC8& aInitData )
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	{
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	//make sure the cast will be ok by checking the uid is what we expect
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	__ASSERT_ALWAYS(aImplementationUid==KUidMmfAudioOutput, Panic(EMMFAudioOutputPanicBadUID));
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	MMMFAudioOutput* retPtr = STATIC_CAST(MMMFAudioOutput*, MDataSink::NewSinkL(aImplementationUid, aInitData));
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	return retPtr;
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	}
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/**
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@publishedAll
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@released
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The interface into DevSound.
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Abstract data sink class providing an interface into hardware sound output.
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Uses CMMFDevSound to access such output.
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*/
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class CMMFAudioOutput : public CBase, public MMMFAudioOutput, public MDevSoundObserver
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	{
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public:
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	static MDataSink* NewSinkL() ;
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	virtual CMMFAudioOutput::~CMMFAudioOutput();
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	void ConstructL();
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	//MDataSink mixin implementations
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	virtual TFourCC SinkDataTypeCode(TMediaId aMediaId); //used by data path MDataSource/Sink for codec matching
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	virtual void EmptyBufferL(CMMFBuffer* aBuffer, MDataSource* aSupplier, TMediaId aMediaId);//called by a MDataSource to empty a buffer
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	virtual void BufferFilledL(CMMFBuffer* aBuffer); //called by MDataSource to pass back full buffer to the sink
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	virtual TBool CanCreateSinkBuffer();
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	virtual CMMFBuffer* CreateSinkBufferL(TMediaId aMediaId, TBool &aReference);
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	virtual TInt SinkThreadLogon(MAsyncEventHandler& aEventHandler);
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	virtual void SinkThreadLogoff();
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	virtual void SinkPrimeL();
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	virtual void SinkPauseL();
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	virtual void SinkPlayL();
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	virtual void SinkStopL();
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	virtual void SetSinkPrioritySettings(const TMMFPrioritySettings& aPrioritySettings);
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	virtual void NegotiateL(MDataSource& aSource);
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	// MMMFAudioOutput mixin implementations
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	TInt BytesPlayed();
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	void HWEmptyBufferL(CMMFBuffer* aBuffer, MDataSource* aSupplier);//called by a EmptyBufferL if using HW codec
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	CMMFDevSound& SoundDevice();
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	virtual TInt SetSinkDataTypeCode(TFourCC aSinkFourCC, TMediaId aMediaId);
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	//The following DataType() methods should not be used.
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	//They are provided to maintain BC/SC with 7.0s
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	virtual void SetDataTypeL(TFourCC aAudioType);
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	virtual TFourCC DataType() const;
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protected:
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	virtual void ConstructSinkL( const TDesC8& aInitData ) ;
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private:
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	inline CMMFAudioOutput() {}
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	void ConfigDevSoundL();
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	void LoadL();
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	TInt State();
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	//MDevSoundObserver mixin implementations	
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	virtual void InitializeComplete(TInt aError);
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	virtual void ToneFinished(TInt aError); 
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	virtual void BufferToBeFilled(CMMFBuffer* aBuffer);
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	virtual void PlayError(TInt aError); 
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	virtual void BufferToBeEmptied(CMMFBuffer* aBuffer); 
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	virtual void RecordError(TInt aError); 
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	virtual void ConvertError(TInt aError);
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	virtual void DeviceMessage(TUid aMessageType, const TDesC8& aMsg);
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	virtual void SendEventToClient(const TMMFEvent& /*aEvent*/);
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private:
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	MAsyncEventHandler* iEventHandler;
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	CMMFDevSound* iMMFDevSound;	//this is now private to stop stuff "grabbing it"
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	CMMFBuffer* iAudioBuffer;
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	TInt iInitializeState;	
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	enum TState
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		{
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		EIdle=0,
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		EDevSoundReady,
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		EPaused
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		};
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	enum TError
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		{
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		ECantCreateBuffer,
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		EEmptyBuffer,
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		EDevSoundNotLoaded,
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		ERecordNotSupported,
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		EDevSoundError,
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		EUnknown
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		};
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	MDataSource* iSupplier;
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	TState iState;
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	TBool iFirstBufferSent;
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	TBool iDevSoundLoaded;
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	TError iError;
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	TInt iMMFDevsoundError;
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	TMMFPrioritySettings iPrioritySettings;
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	TUint iSourceSampleRate; 
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	TUint iSourceChannels;
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	TFourCC iSourceFourCC;
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	TFourCC iDataTypeCode;
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	CMMFDataBuffer* iDevSoundBuffer;
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	TMMFCapabilities iDevSoundConfig;
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 	TBool iNeedsSWConversion;
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	TUint iSWConvertSampleRate;
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	TUint iSWConvertChannels;
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 	CMMFChannelAndSampleRateConverterFactory* iChannelAndSampleRateConverterFactory;
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 	CMMFChannelAndSampleRateConverter* iChannelAndSampleRateConverter;
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 	CMMFDataBuffer* iConvertBuffer;
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 	CMMFBuffer* iBufferToEmpty;
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 	CActiveSchedulerWait* iActiveSchedulerWait;
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	};
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#endif