examples/Multimedia/MmfExSinkSource/mmfexdes.h

// 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:
// MMFDes.h
//

#ifndef __MMFDES_H_
#define __MMFDES_H_


#include <mmf/server/mmfclip.h>
#include <mmf/common/mmfutilities.h>

//Panic codes for MMFDescriptor
enum TMMFExDescriptorPanicCode
        {
        EMMFDescriptorPanicBufferEmptiedLNotSupported = 1,
        EMMFDescriptorPanicBufferFilledLNotSupported
        };
        
class TMMFExDescriptorParams
        {
public:
        TAny* iDes ; // Address of TPtr8 describing source Descriptor
        TThreadId iDesThreadId ;
        } ;

typedef TPckgBuf<TMMFExDescriptorParams>  TMMFDescriptorConfig ;

// Defines a MMF sink and source plug-in that can write and read media data
// to a descriptor
// Implements CMMFClip, which itself derives from MDataSource and MDataSink
class CMMFExDescriptor : public CMMFClip
        {
public:
        // Data source factory
        static MDataSource* NewSourceL() ; 
        // Data sink factory
        static MDataSink* NewSinkL() ; 
        ~CMMFExDescriptor() ;
        
private:
        // From MDataSource
        TFourCC SourceDataTypeCode( TMediaId /*aMediaId*/) ;
        void FillBufferL(CMMFBuffer* aBuffer, MDataSink* aConsumer,TMediaId /*aMediaId*/) ;//called by a MDataSink to request buffer fill
        void BufferEmptiedL( CMMFBuffer* aBuffer ) ;
        TBool CanCreateSourceBuffer() ;
        CMMFBuffer* CreateSourceBufferL(TMediaId /*aMediaId*/, TBool &aReference) ;
        void ConstructSourceL(  const TDesC8& aInitData ) ;

        // From MDataSink
        TFourCC SinkDataTypeCode(TMediaId /*aMediaId*/) ; //used by data path MDataSource/Sink for codec matching
        void EmptyBufferL( CMMFBuffer* aBuffer, MDataSource* aSupplier, TMediaId /*aMediaId*/ ) ; 
        void BufferFilledL( CMMFBuffer* aBuffer ) ;
        TBool CanCreateSinkBuffer() ;
        CMMFBuffer* CreateSinkBufferL( TMediaId /*aMediaId*/ , TBool &aReference) ;
        void ConstructSinkL( const TDesC8& aInitData ) ;

        // From CMMFClip
        void ReadBufferL( TInt aLength, CMMFBuffer* aBuffer, TInt aPosition, MDataSink* aConsumer);
        void WriteBufferL( TInt aLength, CMMFBuffer* aBuffer, TInt aPosition, MDataSource* aSupplier);
        void ReadBufferL( CMMFBuffer* aBuffer, TInt aPosition, MDataSink* aConsumer) ;
        void WriteBufferL( CMMFBuffer* aBuffer, TInt aPosition, MDataSource* aSupplier) ;
        void ReadBufferL( CMMFBuffer* aBuffer, TInt aPosition) ;
        void WriteBufferL( CMMFBuffer* aBuffer, TInt aPosition) ;
        TInt64 BytesFree() ;  // amount of space available for the clip
        TInt Size() ;  // length of clip

        // Construction
        void ConstructL( const TDesC8& aInitData ) ;
        CMMFExDescriptor();
        // Helpers
        void Reset() { iOffset = 0 ; };

private:
        // Need to know about the thread that the descriptor is in
        RThread iDesThread;
        TDes8* iDes ;
        TInt iOffset;
        TFourCC iSinkFourCC;
        TFourCC iSourceFourCC;
        TBool iUseTransferBuffer;
        } ;


#endif

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