srsfenginestub/nlphwdevice/src/asrsnlphwdevice.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 14 Jan 2010 07:14:53 +0200
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/*
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* Copyright (c) 2004 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:     Algorithms for text normalization
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*
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*/
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#ifndef NLPHWDEVICE_H
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#define NLPHWDEVICE_H
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//  INCLUDES
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#include <e32std.h>
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#include <e32base.h>
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#include <nssttscommon.h>
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#include <asrshwdevice.h>
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// FORWARD DECLARATIONS
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class CNlpAlgorithm;
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// CLASS DECLARATION
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/**
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*  Class to define callback functions
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*
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*  @lib asrsttshwdevice.lib
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*  @since 3.0
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*/
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class MNlpHwDeviceObserver
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    { 
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    public: // New functions
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        /**
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        * Called by the HW device when the asynchronous text processing 
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        * has been completed.
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        * @since 3.0
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        * @param aStatus Error code, KErrNone if success
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        * @return none
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        */
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        virtual void MnhdoNlpCompleted( TInt aStatus ) = 0;
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        /**
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        * Invoked by Nlp Hw Device when it needs a configuration data package.
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        * @since 3.0
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        * @param aPackageType Type identifier. 
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        * @param aPackageID Identifier of package
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        * @param aStartPosition Start index in bytes
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        * @param aEndPosition End index in bytes. If the position is bigger 
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        *         than the size of data package, the end part will be returned.
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        * @return Data package in a buffer
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        */
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        virtual HBufC8* MnhdoConfigurationData( TUint32 aPackageType, 
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                                                TUint32 aPackageID, 
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                                                TUint32 aStartPosition = 0, 
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                                                TUint32 aEndPosition = KMaxTUint32 
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                                              ) = 0;
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        /**
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        * Returns style given the style id.
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        * @since 3.0
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        * @param aStyleID The style id.
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        * @return A reference to TTtsStyle.
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        */
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        virtual const TTtsStyle& MnhdoStyleL( TTtsStyleID aStyleID ) = 0; 
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    };
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/**
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*  Class to provide text normalization
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*
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*  @lib asrsnlphwdevice.lib
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*  @since 3.0
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*/
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class CNlpHwDevice : public CASRSHwDevice
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    {
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    public: // Constructors and destructor
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        /**
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        * Two-phased constructor.
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        * @param aObserver Observer which implements callback functions.
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        * @param aSamplingRate Sampling rate for output audio
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        * @param aBufferSize Buffer size for output audio
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        */
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        IMPORT_C static CNlpHwDevice* NewL( MNlpHwDeviceObserver& aObserver );
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        /**
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        * Destructor.
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        */
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        IMPORT_C virtual ~CNlpHwDevice();
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    public: // New functions
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        /**
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        * Ask if a language is supported or not.
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        * @since 3.0
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        * @param aLanguage Synthesizing language.
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        * @return ETrue language is supported otherwise EFalse
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        */
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        IMPORT_C TBool IsLanguageSupported( TLanguage aLanguage );
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		/**
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        * Normalize given text, text is not splits into segments.
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        * @since 3.0
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        * @param aText 
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        */
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        IMPORT_C void NormalizeTextL( CTtsParsedText& aText );
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		/**
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        * Normalize given text asynchronously, text is not splits into segments.
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        * @since 3.0
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        * @param aText 
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        */
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        IMPORT_C void NormalizeTextAsyncL( CTtsParsedText& aText );
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        /**
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        * Normalize given text, text is split into segments
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        * @since 3.0
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        * @param aText 
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        */      
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       	IMPORT_C void NormalizeAndSegmentTextL( CTtsParsedText& aText );
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        /**
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        * Normalize given text asynchronously, text is split into segments
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        * @since 3.0
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        * @param aText 
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        */      
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       	IMPORT_C void NormalizeAndSegmentTextAsyncL( CTtsParsedText& aText );
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    private:
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        /**
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        * C++ default constructor.
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        */
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        CNlpHwDevice();
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        /**
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        * By default Symbian 2nd phase constructor is private.
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        */
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        void ConstructL( MNlpHwDeviceObserver& aObserver );
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    private: // Data
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		// Actual algorithm where all processing happens
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		CNlpAlgorithm* iAlgorithm;
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		// Reserved pointer for future extension
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        TAny* iReserved;
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    };
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#endif // NLPHWDEVICE_H   
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// End of File