mpxmusicplayer/activeidle/aiplayerplugin/inc/aiplayerpluginengine.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2007-2007 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:  Engine which interfaces to MPX framework.
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*
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*/
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#ifndef C_AIPLAYERPLUGINENGINE_H
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#define C_AIPLAYERPLUGINENGINE_H
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#include <e32base.h>
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#include <mpxplaybackobserver.h>
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#include "aiplayerpluginengineobserver.h"
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class MMPXPlaybackUtility;
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/**
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 *  Music Player Player Plugin Engine.
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 *  This class provides interface to MPX framework.
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 *
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 *  @lib aiplayerplugin2.lib
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 *  @since S60 5.0
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 */
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NONSHARABLE_CLASS( CAiPlayerPluginEngine ) : public CBase,
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                                             public MMPXPlaybackObserver,
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                                             public MMPXPlaybackCallback
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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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     */
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    static CAiPlayerPluginEngine* NewL( MAiPlayerPluginEngineObserver& aObserver );
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    /**
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     * Destructor.
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     */
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    virtual ~CAiPlayerPluginEngine();
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    /**
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     * From MMPXPlaybackObserver
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     * See mpxplaybackobserver.h for detailed description.
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     * @since S60 5.0
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     */
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    void HandlePlaybackMessage( CMPXMessage* aMessage, TInt aError );
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    /**
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     * From MMPXPlaybackCallback
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     * See mpxplaybackobserver.h for detailed description.
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     * @since S60 5.0
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     */
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    void HandlePropertyL( TMPXPlaybackProperty aProperty, TInt aValue, TInt aError );
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    void HandleSubPlayerNamesL( TUid aPlayer, const MDesCArray* aSubPlayers, TBool aComplete, TInt aError );
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    void HandleMediaL( const CMPXMedia& aMedia, TInt aError );
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    void HandlePlaybackCommandComplete( CMPXCommand* aCommandResult, TInt aError );
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public:
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    /**
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     * Get the current state of the active player.
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     *
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     * @return Active player state
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     * @see TMPlayerState
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     */
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    TMPlayerState PlayerState();
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    /**
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     * Get the title of the currently playing song.
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     *
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     * @return Song title
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     */
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    const TDesC& Title();
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    /**
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     * Get the artist of the currently playing song.
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     *
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     * @return Artist
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     */
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    const TDesC& Artist();
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    /**
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     * Get the current position.
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     *
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     * @return Current position.
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     */
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    TInt Position();
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    /**
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     * Get the duration of the currently playing song.
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     *
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     * @return Song duration.
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     */
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    TInt Duration();
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    /**
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     * Get the current volume.
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     *
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     * @return Current volume.
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     */
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    TInt Volume();
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    /**
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     * Set volume.
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     *
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     * @param aVolume Volume level
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     */
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    void SetVolumeL( TInt aVolume );
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private:
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    /**
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     * C++ default constructor.
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     */
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    CAiPlayerPluginEngine( MAiPlayerPluginEngineObserver& aObserver );
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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();
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    /**
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     *  Handle playback message
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     *
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     *  @param aMessage playback message
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     */
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    void DoHandlePlaybackMessageL( const CMPXMessage& aMessage );
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    /**
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     *  Handle playback property
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     *
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     *  @param aProperty the property
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     *  @param aValue the value of the property
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     *  @param aError error code
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     */
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    void DoHandlePropertyL( TInt aProperty, TInt aValue, TInt aError );
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    /**
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     *  Handle playback state changed.
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     *
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     *  @param aState New Playback state
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     */
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    void DoHandleStateChangedL( TMPXPlaybackState aState );
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    /**
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     * Displays error notes.
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     *
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     * @param aError Error ID to be handled.
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     */
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    void HandleErrorL( TInt aError );
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    /**
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     *  Map states from TMPXPlaybackState to TMPlayerState
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     *
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     *  @param aState State in TMPXPlaybackState format
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     *  @return State in TMPlayerState format, or KErrNotFound
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     *          if the state can't be mapped
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     */
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    TMPlayerState MapState( TMPXPlaybackState aState );
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    /**
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     *  Map volume from MPX player to AI volume level.
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     *
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     *  @param aVolume Volume level from MPX player
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     *  @return Volume level for AI.
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     */
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    TInt MapToAiVolume( TInt aVolume );
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    /**
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     *  Map volume from AI to MPX player volume level.
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     *
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     *  @param aVolume Volume level from AI
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     *  @return Volume level for MPX player.
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     */
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    TInt MapToMpxVolume( TInt aVolume );
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    /**
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     *  Request media.
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     */
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    void RequestMediaL();
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private:    // Data
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    MAiPlayerPluginEngineObserver* 	iObserver; 			// Not owned
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    MMPXPlaybackUtility* 			iPlaybackUtility; 	// Owned
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    HBufC*		iTitle;
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    HBufC*		iArtist;
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    TInt		iMaxVolume;
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    TInt		iVolume;
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    TInt		iPosition;
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    TInt		iDuration;
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    };
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#endif  // C_CAiPlayerPluginEngine_H
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// End of File