srsfenginestub/ttshwdevice/src/asrsttshwdevice.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 Speech Synthesis
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*
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*/
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#ifndef TTSHWDEVICE_H
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#define TTSHWDEVICE_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 CTtsAlgorithm;
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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 2.8
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*/
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class MTtsHwDeviceObserver
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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 synthesis has been completed.
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        * @since 2.8
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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 MthdTtsCompleted( TInt aStatus ) = 0;
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		/**
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        * Invoked by TTS HW Device when it needs a configuration data package.
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        * @since 2.8
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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* MthdoConfigurationData( TUint32 aPackageType, 
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                                                TUint32 aPackageID, 
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                                                TUint32 aStartPosition, 
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                                                TUint32 aEndPosition) = 0;
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		/**
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        * Called by the HW device when custom command implementation wants to notify a client.
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        * @since 2.8
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        * @param aEvent Event code aStatus Error code, KErrNone if success.
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        * @param aParameter Optional parameter 
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        * @return none
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        */
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		virtual void MthdCustomEvent( TInt aEvent, 
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                                      TInt aStatus, 
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                                      const TDesC8& aParameter = KNullDesC8 ) = 0;
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        /**
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        * Called by the HW device when the HW device has synthesized a new audio buffer.
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        * @since 2.8
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        * @param aBuffer Synthesized audio buffer.
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        * @return none
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        */
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        virtual void MthdProcessBuffer( const TDesC8& aBuffer ) = 0;
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	};
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/**
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*  Class to provide speech synthesis
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*
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*  @lib asrsttshwdevice.lib
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*  @since 2.8
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*/
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class CTtsHwDevice : 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 CTtsHwDevice* NewL( MTtsHwDeviceObserver& aObserver,
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                                            TUint aSamplingRate, 
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                                            TUint aBufferSize );
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        /**
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        * Destructor.
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        */
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        IMPORT_C virtual ~CTtsHwDevice();
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    public: // New functions
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        /**
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        * Adds new style to the collection. If equal style exists already, new style is not added.
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        * @since 2.8
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        * @param aStyle Style to be added.
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        * @return Identifier of added style. If equal style exists already, identifier to the old style will be returned.
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        */
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        IMPORT_C TTtsStyleID AddStyleL( const TTtsStyle& aStyle );
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        /**
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        * Analyses stucture of text and adds style information.
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        * @since 2.8
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        * @param aText Updates text object by dividing it into segments with new styles.
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        * @return none
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        */
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        IMPORT_C void AnalyzeProsodyL( CTtsParsedText& aText );
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        /**
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        * Analyses stucture of text by finding paragraphs and sentences.
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        * @since 2.8
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        * @param aText Updates text object by segmenting it into paragraphs and sentences.
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        * @return none
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        */
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        IMPORT_C void AnalyzeStructureL( CTtsParsedText& aText );
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        /**
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        * Notifies that the buffer has been processed
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        * @since 2.8
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        * @param aBuffer The buffer which has been processed
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        * @return none
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        */
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        IMPORT_C void BufferProcessed( const TDesC8& aBuffer );
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        /**
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        * Deletes style.
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        * @since 2.8
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        * @param aStyleID Identifier of style to be deleted.
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        * @return none
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        */
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        IMPORT_C void DeleteStyleL( TTtsStyleID aStyleID );
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        /**
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        * Gives current position of synthesizing.
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        * @since 2.8
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        * @param aTime Time of the synthesizing position.
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        * @return none
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        */
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        IMPORT_C void GetPositionL( TTimeIntervalMicroSeconds& aTime );
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        /**
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        * Gives current position of synthesizing.
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        * @since 2.8
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        * @param aSegment The segment being synthesizing
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        * @param aWordIndex The index of word being synthesizing
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        * @return none
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        */
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        IMPORT_C void GetPositionL( TTtsSegment& aSegment, 
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                                    TInt& aWordIndex );
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        /**
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        * Ask if a language is supported or not.
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        * @since 2.8
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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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        * Gives number of styles.
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        * @since 2.8
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        * @param none
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        * @return Number of styles.
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        */
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        IMPORT_C TUint16 NumberOfStyles() const;
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        /**
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        * Pauses synthesizing. 
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        * @since 2.8
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        * @param none
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        * @return none
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        */
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        IMPORT_C void Pause();
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        /**
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        * Prepares for synthesizing.
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        * @since 2.8
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        * @param aStream Stream to be synthesized.
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        * @return none
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        */
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        IMPORT_C void PrimeSynthesisL( MTtsSegmentStream& aStream );
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        /**
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        * Prepares for synthesizing. 
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        * @since 2.8
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        * @param aText Text containing segments to be synthesized.
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        * @return none
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        */
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        IMPORT_C void PrimeSynthesisL( CTtsParsedText& aText );
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        /**
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        * Sets new position for synthesizing.
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        * @since 2.8
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        * @param aTime Time of the synthesizing postion.
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        * @return none
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        */
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        IMPORT_C void SetPositionL( const TTimeIntervalMicroSeconds& aTime );
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        /**
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        * Sets new position for synthesizing.
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        * @since 2.8
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        * @param aSegment The segment being synthesizing
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        * @param aWordIndex The index of word being synthesizing
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        * @return none
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        */
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        IMPORT_C void SetPositionL( const TTtsSegment& aSegment, 
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                                    TInt aWordIndex );
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        /**
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        * Stops synthesizing and releases resources of synthesizing. 
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        * The method does nothing if already stopped.
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        * @since 2.8
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        * @param 
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        * @return none
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        */
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        IMPORT_C void Stop();
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        /**
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        * Receives style information
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        * @since 2.8
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        * @param aStyleID Style identifier
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        * @return Style
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        */
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        IMPORT_C TTtsStyle& StyleL( TTtsStyleID aStyleID );
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        /**
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        * Receives style information
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        * @since 2.8
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        * @param aIndex Index to style: 0..NumberOfStyles()
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        * @return Style
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        */
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        IMPORT_C TTtsStyle& StyleL( TUint16 aIndex );
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        /**
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        * Starts waveform production. The synthesized audio buffers are send back 
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        * to client using MthdProcessBuffer().
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        * @since 2.8
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        * @param none
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        * @return none
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        */
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        IMPORT_C void SynthesizeL();
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    private:
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        /**
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        * C++ default constructor.
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        */
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        CTtsHwDevice();
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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( MTtsHwDeviceObserver& aObserver,
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                         TUint aSamplingRate, 
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                         TUint aBufferSize );
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    private: // Data
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		// Actual algorithm where all processing happens
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		CTtsAlgorithm* 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 // TTSHWDEVICE_H   
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// End of File