// Copyright (c) 2001-2009 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:
// source\server\mmfdatapath.h
// 
//

#ifndef MMFDATAPATH_H
#define MMFDATAPATH_H

#include <mmf/common/mmfcontroller.h>
#include <mmf/server/mmfdatasource.h>
#include <mmf/server/mmfdatasink.h>
#include <mmf/server/mmfcodec.h>
#include <mmf/server/mmfbuffer.h>
#include <mmf/common/mmfutilities.h>
#include <mmf/server/mmfformat.h>
#include <mmf/server/mmfsubthreadbase.h>

/**
 * @publishedAll
 * @deprecated
 *
 * Datapath general error code used when sending events to clients
 */
const TUid KMMFErrorCategoryDataPathGeneralError = {0x101F76DC};



/**
@publishedAll
@deprecated

Abstract utility class that moves data from a single data source to a single data sink, via a codec if required.

All functions are exported form the DLL and are virtual to allow plugins to define their own data paths.
*/
class CMMFDataPath : public CActive,
					 public MDataSink,
					 public MDataSource, 
					 public MAsyncEventHandler
	{ 
public:

	//CMMFDataPath constructor if codec Uid is not already known by CMMFController
	//and there is no data path ambiguity - ie only one data path is possible
	IMPORT_C static CMMFDataPath* NewL(MAsyncEventHandler& aEventHandler); 

	//CMMFDataPath constructor if codec Uid is not already known by CMMFController
	//and there is ambiguity ie more than one possible data path TMediaId used to select path 
	IMPORT_C static CMMFDataPath* NewL(TMediaId aMediaId, MAsyncEventHandler& aEventHandler); 

	//CMMFDataPath constructor if codec Uid is already known by CMMFController
	//and there is no data path ambiguity - ie only one data path is possible
	IMPORT_C static CMMFDataPath* NewL(TUid aCodecUid, MAsyncEventHandler& aEventHandler); 

	//CMMFDataPath constructor if codec Uid is already known by CMMFController
	//and there is ambiguity ie more than one possible data path TMediaId used to select path 
	IMPORT_C static CMMFDataPath* NewL(TUid aCodecUid, TMediaId aMediaId, MAsyncEventHandler& aEventHandler);

	IMPORT_C virtual ~CMMFDataPath();

	// Called when source and sink needs to be de-referenced
	IMPORT_C virtual void ResetL();

	//from MDataSink - CMMFData path is a sink to its MDataSource
	IMPORT_C virtual void EmptyBufferL(CMMFBuffer* aBuffer, MDataSource* aSupplier, TMediaId aMediaId); //only required for an active push MDataSource requesting a buffer empty - not implemented
	IMPORT_C virtual void BufferFilledL(CMMFBuffer* aBuffer); //called by the CMMFDataPath's MDataSource when it has filled the buffer
	IMPORT_C virtual TBool CanCreateSinkBuffer(); //from both MDataSource & MDataSink?
	IMPORT_C virtual CMMFBuffer* CreateSinkBufferL(TMediaId aMediaId); //CMMFDataPath can't create buffers
	IMPORT_C virtual CMMFBuffer* CreateSinkBufferL(TMediaId aMediaId, TBool &aReference); //CMMFDataPath can't create buffers

	IMPORT_C virtual TFourCC SinkDataTypeCode(TMediaId aMediaId);

	//from MDataSource
	IMPORT_C virtual void FillBufferL(CMMFBuffer* aBuffer, MDataSink* aConsumer, TMediaId aMediaId); //only required for an active pull MDataSink requesting buffer fill - not implementated
	IMPORT_C virtual void BufferEmptiedL(CMMFBuffer* aBuffer);//called by the CMMFDataPath's MDataSink when it has emptied the buffer
	IMPORT_C virtual TBool CanCreateSourceBuffer(); //from both MDataSource & MDataSink?
	IMPORT_C virtual CMMFBuffer* CreateSourceBufferL(TMediaId aMediaId); //CMMFDataPath can't create buffers
	IMPORT_C virtual CMMFBuffer* CreateSourceBufferL(TMediaId aMediaId, TBool &aReference); //CMMFDataPath can't create buffers
	IMPORT_C virtual TFourCC SourceDataTypeCode(TMediaId aMediaId);

	IMPORT_C virtual void AddDataSourceL(MDataSource* aSource);
	IMPORT_C virtual void AddDataSinkL(MDataSink* aSink);

	//could derive these from a mixin eg MMMFControle later for active MDataSource/Sinks
	IMPORT_C virtual void PrimeL();
	IMPORT_C virtual void PlayL();
	IMPORT_C virtual void Pause();
	IMPORT_C virtual void Stop();

	IMPORT_C virtual TTimeIntervalMicroSeconds Position() const;
	IMPORT_C virtual void SetPositionL(const TTimeIntervalMicroSeconds& aPosition);

	// Play Window.
	IMPORT_C virtual void SetPlayWindowL( const TTimeIntervalMicroSeconds& aStart, const TTimeIntervalMicroSeconds& aEnd ) ;
	IMPORT_C virtual void ClearPlayWindowL() ;

	//State
	IMPORT_C virtual TInt State();

	//CActive implementations
	IMPORT_C void RunL();
	IMPORT_C void DoCancel();
	IMPORT_C TInt RunError(TInt aError);

	//error handling
	IMPORT_C TInt DoSendEventToClient(TUid aEventType, TInt aErrorCode);

	IMPORT_C TInt SetBlockLength(TUint aBlockLength);
	/**
	
	Indicates the state of the data path.

	Mimics typical MultiMedia behaviour of stopped, primed and playing
	*/
	enum TDataPathState
		{
		/** Stopped.
		*/
		EStopped,
		/** Primed.
		*/
		EPrimed,
		/** Playing.
		*/
		EPlaying,
		/** Recording.
		*/
		ERecording,
		/** Converting.
		*/
		EConverting
		};

	/**
	@internalComponent
	*/
	class CCompleteCallback : public CActive
		{
	public:
		CCompleteCallback(CMMFDataPath& aDataPath, TBool aWaitForSink);
		~CCompleteCallback();

		void SignalDataPathComplete(TInt aDataPathError);
		void SignalSinkComplete(TInt aSinkError);
		TRequestStatus& ActiveStatus();

		void DoCancel();
	private:
		void RunL();
		CMMFDataPath& iDataPath;
		TBool iDataPathComplete;
		TBool iSinkComplete;
		TBool iWaitForSink;

		TInt iSinkError;
		TInt iDataPathError;
		};
	friend class CCompleteCallback;
	friend class CMMFDataPath2;
protected:

	/**
	Indicates the transfer state.
	
	Buffers maybe be filled, emptied, or have "one" shot initialisatings performed upon them.
	
	TTransferState is used within the datapath RunL which drives databuffer exchange.
	*/
	enum TTransferState
		{
		/** Waiting on a BufferEmptied callback from sink
		*/
		EWaitSink,
		/** Waiting on a BufferFilled callback from source
		*/
		EWaitSource,
		/** Initialize the sink.
		*/
		EInitializeSink,
		/** Initialize the source.
		*/
		EInitializeSource,
		/** Source buffer does not contain data.
		*/
		ENeedSourceData,
		/** Sink buffer does not contain data.
		*/
		ENeedSinkData,
		/** There is more source data to send to the sink and need to match sink and source.
		*/
		ENeedToMatchSourceToSink,
		/** Outstanding data to send to sink.
		*/
		ESendDataToSink,
		/** End of data.
		*/
		EEndOfData //indicates that the datapath has transferred all the data to the sink
		};




protected:
	CMMFDataPath(TMediaId aMediaId, MAsyncEventHandler& aEventHandler) : 
		CActive(EPriorityStandard), MDataSink(KUidMmfDataPath), MDataSource(KUidMmfDataPath),
		iEventHandler(aEventHandler), iMediaId(aMediaId), iState(EStopped) 
			{CActiveScheduler::Add(this);};

	IMPORT_C void ConstructL(TUid aCodecUid = KNullUid);
	IMPORT_C virtual void ConstructSourceL( const TDesC8& aInitData ) ;
	IMPORT_C virtual void ConstructSinkL( const TDesC8& aInitData ) ;
	IMPORT_C virtual void EndOfData();

	//These methods use API on DevSound to determine how many samples have been played/recorded
	//and thereby determine the real position.
	TTimeIntervalMicroSeconds CalculateAudioOutputPosition() const;
	TTimeIntervalMicroSeconds CalculateAudioInputPosition() const;

	//These methods determine the position of either the input or the output.
	//The position may come from a format or from an audio input/output depending on 
	//the operation the datapath is doing (Playing (output), Recording & Converting (input))
	TTimeIntervalMicroSeconds OutputPosition() const;
	TTimeIntervalMicroSeconds InputPosition() const;


	//Determines what buffers are required (see TNeedBuffer)
	//May leave KErrNotSupported if source/sinks can't supply the necessary buffers
	TInt DetermineBuffersToUseL(void) const; 

	//Determines how many samples have been played by DevSound
	TInt AudioSamplesPlayed() const;

	//Determines how many samples have been recorded by DevSound
	TInt AudioSamplesRecorded() const;


private:
	void ChangeDataPathTransferState(TTransferState aNewDataPathTransferState);
	void CreateDataPathL(MDataSource* aSource, MDataSink* aSink);
	
	void InitializeSinkL();
	void InitializeSourceL();
	void FillSourceBufferL();
	void FillSinkBufferL();
	void EmptySinkBufferL();
	void DoCleanupBuffers();
	void ObtainSyncBuffersL(); //tries to obtain synchronous data buffers from src/snk

	TTimeIntervalMicroSeconds Duration() const;

	void DoStopL();
	void DoPauseL();
	void DoEndOfDataL();

	IMPORT_C TInt SendEventToClient(const TMMFEvent& aEvent);

	void SetBuffersAvailable();
	void ResetRefBuffers();

	

protected:
	/**
    Event handler.
	*/
	MAsyncEventHandler& iEventHandler;

	/** 
	The source of data to which the CMMFDataPath is a MDataSink for.
	*/
	MDataSource* iDataSource;
	/** 
	The sink of data for which the CMMFDataPath is a MDataSource for
	*/
	MDataSink* iDataSink;
	/** 
	Set to true when the sink is able to accept data. EFalse otherwise.
	*/
	TBool iSinkCanReceive;
	/**
	The sink's data type. Same as the codec input data type.
	*/
	TFourCC iSinkFourCC;
	/** 
	The source's data type. Same as the codec output data type.
	*/
	TFourCC iSourceFourCC;
	/** 
	Identifies which media type and stream within MDataSource.
	*/
	TMediaId iMediaId;
	/** 
	Codec in use. Null Codec is signified by == NULL
	*/
	CMMFCodec* iCodec;

	/**
    Result of processing the codec.
	*/
	TCodecProcessResult iCodecProcessResult;

	/**
	Set to ETrue when the data path has a source and a sink and can send data from the source to the sink.
	*/
	TBool iDataPathCreated;
	
	/**
	Current data path state. 
	@see TDataPathState	
	*/
	TDataPathState iState;

	/**
    Current transfer state.
	@see TTransferState
	*/
	TTransferState iTransferState;

	/**
	Set to true if data path has to use a supplied codec in its construction.
	*/
	TBool iUseSuppliedCodecUid;

	/** 
	This is set to point to whichever sink buffer is in use.
	*/
	CMMFBuffer* iSinkBuffer;

	/**
	This is the pointer to whichever source buffer is in use
	*/
	CMMFBuffer* iSourceBuffer;

	/**
	The source's position in terms of frames or some other time fixed parameter.
	*/
	TUint iCurrentSourceFrameNumber;

	/**
	The sink's position in terms of frames or some other time fixed parameter.
	*/
	TUint iCurrentSinkFrameNumber;

	/**
	Indicates that all data has been obtained from the source (ETrue if there is no more source data).
	*/
	TBool iNoMoreSourceData;

	/** 
	Indicates that all data has been sent to the sink.
	*/
	TBool iAllDataSentToSink;

	/** 
	Datapath completed because of an error; usually KErrNone.
	*/
	TUint iDataPathCompletedErrorCode;

	/**
	Start position of the play window.
	*/
	TTimeIntervalMicroSeconds iPlayWindowStartPosition ;
	
	/**
	End position of the play window.
	*/
	TTimeIntervalMicroSeconds iPlayWindowEndPosition ;

	/**	
	The position audio will start playing from.
	When stopping, this is set to iPlayWindowStartPosition.
	When pausing, this is set to the current position.
	*/
	TTimeIntervalMicroSeconds iStartPosition;

	/**	
	This value can be used to obtain the duration of the source when playing or converting.
	This is an optimisation as this value will not change if we are playing or converting.
	*/
	TTimeIntervalMicroSeconds iCachedSourceDuration;


	/** 
	ETrue if the source buffer is reference to object owned by someone else.
	*/
	TBool iSrcBufRef;

	/**
	ETrue if sink buffer is reference to object owned by someone else
	*/
	TBool iSnkBufRef;

	/**
	Indicates asynchrous buffers from AudioInput.
	*/
	TBool iObtainingAsyncSourceBuffer;

	/**
	Indicates asynchrous buffers from AudioOutput.
	*/
	TBool iObtainingAsyncSinkBuffer;

	/** 
	Indicates DoPauseL() has been called.
	*/
	TBool iPauseCalled;

	/**	
	Flag to indicate that a buffer is with the source.

	This is necessary as it is imperrative that when a buffer is with the source, it must
	not be referenced in any way. The reason for this is that it is not mandated that sources
	maintain buffer references. For example, it is valid for DevSound to return recorded data in a
	different buffer to the one supplied to it.
    */
	TBool iSourceBufferWithSource;

	/**
	Flag to indicate that a buffer is with the sink.

	This are necessary as it is imperrative that when a buffer is with the sink, it must
	not be referenced in any way. The reason for this is that it is not mandated that sinks
	maintain buffer references. For example, it is valid for DevSound to request more audio data in a
	different buffer to the one supplied to it.
	*/
	TBool iSinkBufferWithSink;


	/** 
	Holds the number of samples played on audio output at a point where we
	want to reference play duration from.
	*/
	TInt iReferenceAudioSamplesPlayed;

	/** 
	Holds the number of samples recorded from audio input at a point where we
	want to reference record duration from.
	*/
	TInt iReferenceAudioSamplesRecorded;

	/** 
	Pointer to internal callback completion class
	*/
	CCompleteCallback * iCompleteCallback;

	/**
	This indicates what buffers are required in order to operate.
	If a real Codec is in use, buffers are required from both source and sink,
	else only one is required and source is preferred.
	*/
	enum TNeedBuffer
		{
		/** No buffers needed.
		*/
		ENoBuffers = 0x0,
		/** Sink buffer needed.
		*/
		ENeedSinkBuffer = 0x01,
		/** Source buffer needed.
		*/
		ENeedSourceBuffer = 0x10
		};

	/** Holds the outcome of the call to DetermineBuffersToUseL
	*/
	TInt iBuffersToUse;
	};

#endif