vtprotocols/inc/cdatasinkproxy.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 23 Nov 2009 14:47:47 +0200
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/*
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* Copyright (c) 2004-2006 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 CDATASINKPROXY_H
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#define CDATASINKPROXY_H
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NONSHARABLE_CLASS( CPVDisplaySinkNodeProxy ) : public CBase,
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                                               public MVTVideoSource
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    {
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    public: //New
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        /**
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         * Constructor .
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         */
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        CPVDisplaySinkNodeProxy();
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        /**
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         * Set new supplier.
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         * @param aSupplier
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         */
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        void SetSupplier(MPVDataSourceBase* aSupplier);
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    public: //From MVTVideoSource
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        /**
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         * Method called by a data sink to pass back an emptied buffer to the source
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         *
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         * This is a pure virtual function that each derived class must implement.
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         * This method is used as the callback when the data source actively requests a consumer ie a data sink
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         * to empty a buffer by calling the data sinks EmptyBufferL.
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         * When the data source gets this callback it knows that the buffer has been emptied and can be reused
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         * 
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         * @param   "aBuffer"
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         *          The buffer that has been emptied by a data sink and is now available for reuse
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         */
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        virtual void BufferEmptiedL(CMMFBuffer* aBuffer);
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    private:
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        MPVDataSourceBase* iSupplier;
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    };
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NONSHARABLE_CLASS( CDisplaySinkProxy ) : public CBase,
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                                         public MPVDataSink,
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                                         public MPVVideoOutput
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    {
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    public: //From MPVPluginBase
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        /**
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         * This API returns multimedias type supported by the data source/sink - 
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         * Audio, Video, Data etc.  Each supported type is indicated by a MIME type structure.
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         * @return Multimedia types supported by the data source/sink.  The reference 
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         * is valid until the MPVPluginBase derived object is destroyed.
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         **/
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        virtual const RArray<TPVMIMEType *>& GetMultimediaTypesL() const;
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        /**
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         * This API is to allow for extensibility of the plugin interface.
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         * It allows a caller to ask for all UUIDs associated with a particular MIME type.
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         * If interfaces of the requested MIME type are found within the plugin, they are added 
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         * to the UUIDs array.  
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         * 
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         * Also added to the UUIDs array will be all interfaces which have the requested MIME 
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         * type as a base MIME type.  This functionality can be turned off.
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         * 
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         * @param aMimeType The MIME type of the desired interfaces
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         * @param aUuids An array to hold the discovered UUIDs
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         * @param aExactUuidsOnly Turns on/off the retrival of UUIDs with aMimeType as a base type
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         **/
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        virtual void QueryUUID( const TPVMIMEType& aMimeType, RArray<TPVUuid>& aUuids, bool aExactUuidsOnly = false );
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        /**
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         * This API is to allow for extensibility of the plugin interface.
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         * It allows a caller to ask for an instance of a particular interface object to be returned.
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         * The mechanism is analogous to the COM IUnknown method.  The interfaces are identified with
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         * an interface ID that is a UUID as in DCE and a pointer to the interface object is
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         * returned if it is supported.  Otherwise the returned pointer is NULL.
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         * @param aUuid The UUID of the desired interface
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         * @param aInterfacePtr The output pointer to the desired interface
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         **/
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        virtual void QueryInterface( const TPVUuid& aUuid, TPVInterfacePtr& aInterfacePtr );
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        /**
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         *  This API is used to provide a timebase for plugins that deal with synchronized media data
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         **/
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        virtual void SetTimebaseL(MPVSymbianTimebaseInterface* aTimebase);
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    public: //From MPVDataSinkBase
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        /**
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         * Method called by a MDataSource to request the data sink to empty aBuffer of data.
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         *
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         * This is a pure virtual function that each derived class must implement.
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         * This method is used when a data sink is passively waiting for requests from a supplier ie a data source
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         * to empty a buffer.  The data sink must call the BufferEmptiedL member on aSupplier when it has emptied
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         * the buffer of it's data - the data sink can either make this callback synchronously or asynchronously.
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         * 
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         * @param   "aBuffer"
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         *          The full buffer that needs emptying of it's data
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         *
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         * @param   "aSupplier" 
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         *          The data source that supplied the data. The data sink needs this to make the BufferEmptiedL
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         *          callback on aSupplier to indicate to the data source that the data sink has finished with the buffer.
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         *
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         * @param   "aMediaId"
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         *          This identifies the type of media eg audio or video and the stream id.
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         *          This parameter is required in cases where the source can supply data
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         *          of more than one media type and/or multiple strams of data
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         */
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        virtual void EmptyBufferL(CMMFBuffer* aBuffer, MPVDataSourceBase* aSupplier, TMediaId aMediaId);
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        /**
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         * Method called by a data source to pass back an filled buffer to the sink
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         *
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         * This is a pure virtual function that each derived class must implement.
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         * This method is used as the callback when the data sink actively requests a supplier ie a data source
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         * to fill a buffer by calling the data sources FillBufferL.
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         * When the data sink gets this callback it knows that the buffer has been filled and is ready to be emptied
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         * 
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         * @param   "aBuffer"
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         *          The buffer that has been filled by a data source and is now available for processing
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         */
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        virtual void BufferFilledL(CMMFBuffer* aBuffer);
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        /**
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         * Method to indicate whether the data sink can create a buffer.
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         *
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         * This is a pure virtual function that each derived class must implement.
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         * 
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         * @return  ETrue if the data sink can create a buffer else EFalse
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         */
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        virtual TBool CanCreateSinkBuffer();
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        /**
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         * Returns a buffer created by the data sink
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         *
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         * This is a pure virtual function that each derived class must implement.
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         *
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         * @param   "aMediaId"
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         *          This identifies the type of media eg audio or video and the stream id.
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         *          This parameter is required in cases where the source can supply data
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         *          of more than one media type and/or multiple strams of data.
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         *
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         * @param   "aReference"
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         *          This must be written to by the method to indicate whether the created buffer is
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         *          a 'reference' buffer.  A 'reference' buffer is a buffer that is owned by the sink
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         *          and should be used in preference to the source buffer provided the source buffer
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         *          is also not a reference buffer.
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         * .  
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         * @return  The created buffer
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         */
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        virtual CMMFBuffer* CreateSinkBufferL(TMediaId aMediaId, TBool &aReference );
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        /**
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         * Method to 'logon' the data sink to the same thread that sink will be consuming data in.
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         *
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         * This method may be required as the thread that the data sink was created in is not always
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         * the same thread that the data transfer will take place in.  Therefore any thread specific
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         * initialisation needs to be performed in the SinkThreadLogon rather than in the creation 
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         * of the data sink.
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   159
         *
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   160
         * This is a virtual function that a derrived data sink can implement if any thread specific
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         * initialisation is required and/or the data sink can create any asynchronous events.
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   162
         * 
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   163
         * 
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         * @param   "aEventHandler"
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         *          This is an MAsyncEventHandler to handle asynchronous events that occur during the
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         *          transfer of multimedia data.  The event handler must be in the same thread as the data transfer
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         *          thread - hence the reason it is passed in the SinkThreadLogon as opposed to say the constructor.
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   168
         *
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   169
         *
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         * @return  KErrNone if successful, otherwise a system wide error code.
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   171
         */
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        virtual TInt SinkThreadLogon( MAsyncEventHandler& aEventHandler );
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   173
        /**
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   174
         * Method to 'logoff' the data sink from the same thread that sink consumes data in.
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   175
         *
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   176
         * This method may be required as the thread that the data sink is deleted in may not be
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   177
         * the same thread that the data transfer took place in.  Therefore any thread specific
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   178
         * releasing of resources needs to be performed in the SinkThreadLogoff rather than in the destructor
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   179
         *
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   180
         * This is a virtual function that a derrived data sink can implement if any thread specific
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   181
         * releasing of resources is required.
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   182
         */
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   183
        virtual void SinkThreadLogoff();
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   184
        /**
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         * Method to 'prime' the data sink
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   186
         *
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   187
         * This is a virtual function that a derrived data sink can implement if 
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         * any data sink specific 'priming' is required
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   189
         */
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        virtual TInt SinkPrimeL();
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   191
        /**
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   192
         * Method to 'play' the data sink
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   193
         *
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   194
         * This is a virtual function that a derrived data sink can implement if 
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   195
         * any data sink specific action is required prior to 'playing'ie the start of data transfer
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   196
         */
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   197
        virtual TInt SinkPlayL();
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   198
        /**
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   199
         * Method to 'pause' the data sink
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   200
         *
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         * This is a virtual function that a derrived data sink can implement if 
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         * any data sink specific action is required to 'pause'
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   203
         */
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        virtual TInt SinkPauseL();
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   205
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   206
        /**
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         * Method to 'stop' the data sink
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   208
         *
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   209
         * This is a virtual function that a derrived data sink can implement if 
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         * any data sink specific action is required to 'stop'
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   211
         */
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        virtual TInt SinkStopL();
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   213
    public: //From MPVVideoOutput
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   214
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   215
        /**
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         * Set the video frame format.  This must be from the list of supported formats.
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         * @param "aFormat" A mime string describing the video frame format.
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   218
         * @exception Can leave with one of the system wide error codes
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         **/
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   220
        virtual void SetFormatL(const TDesC8& aFormat);
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        /**
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         * Set the video frame size
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         * @param "aSize" The video frame size, in pixels
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         * @exception Can leave with one of the system wide error codes
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         **/
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        virtual void SetVideoFrameSizeL(const TSize& aSize);
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        /**
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         * Get the video frame size
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         * @param "aSize" The video frame size, in pixels
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         * @exception Can leave with one of the system wide error codes
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         **/
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        virtual void GetVideoFrameSizeL(TSize& aSize) const;
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    public:
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        /**
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         * Constructor.
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         */
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        CDisplaySinkProxy(MVTVideoSink* aDisplaySink);
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        /**
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         * ConstructL
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         */
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        void ConstructL();
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        /**
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         * NewL
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         */
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        static CDisplaySinkProxy* NewL(MVTVideoSink* aDisplaySink);
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        /**
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         * Get pointer object of data sink.
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         * @return member variant:iDisplaySink
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         */
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        MVTVideoSink* DisplaySink() { return iDisplaySink; }
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    private:
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        MVTVideoSink* iDisplaySink;
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        CPVDisplaySinkNodeProxy* iDSNodeProxy;
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    };
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NONSHARABLE_CLASS( CAudioSinkProxy ) : public CBase,
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                                       public MVTAudioSink
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    {
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    public:
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        MPVDataSink* iAudioSink;
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    };
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#endif
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//  End of File 
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