mpxplugins/viewplugins/views/equalizerview/inc/mpxequalizerhelper.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 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:  Helper class for managing equalizer utility instances.
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*
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*/
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#ifndef C_MPXEQUALIZERHELPER_H
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#define C_MPXEQUALIZERHELPER_H
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//  INCLUDES
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#include <EqualizerPresetsDialog.h>
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#include <mdaaudiosampleplayer.h>
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#include <mpxplaybackobserver.h>
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#include "mpxequalizerview.h"
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// FORWARD DECLARATIONS
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class MMPXPlaybackUtility;
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class CAudioEqualizerUtility;
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class CEqualizerPresetsDialog;
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// CLASS DECLARATION
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/**
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 *  Helper class for managing equalizer utility instances.
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 *
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 *  @lib mpxplaybackview.lib
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 *  @since S60 v3.0
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 */
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NONSHARABLE_CLASS( CMPXEqualizerHelper ) : public CMPXEqualizerView,
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                                           public MMPXPlaybackObserver,
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                                           public MEqualizerPresetActivationObserver,
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                                           public MMdaAudioPlayerCallback
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    {
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public:
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    /**
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     * Two-phased constructor.
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     *
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     * @since 3.0
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     * @return Pointer to newly created object.
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     */
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    static CMPXEqualizerHelper* NewL();
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    /**
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     * Destructor.
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     */
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    virtual ~CMPXEqualizerHelper();
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private:
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    /**
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     * C++ default constructor.
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     */
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    CMPXEqualizerHelper();
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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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     * Initialize audio equalizer utility for current active playing track.
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     */
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    void InitializeEqualizerUtilityL();
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    /**
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     * Release audio equalizer utility.
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     */
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    void ReleaseEqualizerUtility();
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    /**
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     * Get current preset ID.
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     *
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     * @param aPresetId On return, Current preset ID.
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     * @return Index to the preset array if found.
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     *         KErrNotFound if not found.
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     */
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    TInt GetPresetId( TInt& aPresetId );
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    /**
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     * Initialize secondary audio equalizer utility
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     * for situations when the engine cannot provide one.
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     */
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    void InitializeBackupEqualizerUtilityL();
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    /**
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     * Create secondary audio equalizer utility
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     * based on latest preset settings.
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     */
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    void CreateBackupEqualizerUtility();
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    /**
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     * Setup active equalizer utility for equalizer dialog.
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     */
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    void SetupActiveEqualizerUtility();
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    /**
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     * Launch equalizer dialog.
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     */
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    void DoLaunchEqualizerDialogL();
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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( 
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        const CMPXMessage& aMessage );
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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(
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        TMPXPlaybackState aState );
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// from base class CMPXEqualizerView
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    /**
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     * From CMPXEqualizerView
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     * Launch equalizer dialog.
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     *
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     * @since 3.0
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     */
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    void LaunchEqualizerL();
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// from base class MMPXPlaybackObserver
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    /**
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     * From MMPXPlaybackObserver
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     * Handle playback message
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     * 
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     * @param aMessage playback message
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     * @param aErr system error code.
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     */
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    void HandlePlaybackMessage( CMPXMessage* aMessage, TInt aError );
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// from base class MEqualizerPresetActivationObserver
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    /**
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     * From MEqualizerPresetActivationObserver
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     * Handle preset id activation from Equalizer dialog.
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     * 
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     * @param aActivatedPreset Current activated preset id.
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     */
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    void HandlePresetActivation( TInt aActivatedPreset );
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// from base class MMdaAudioPlayerCallback
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    /**
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     * From MMdaAudioPlayerCallback.
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     * Callback when an attempt to open and initialise an audio sample 
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     * has completed.
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     *
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     * @param aError The status of the audio sample after initialisation.
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     * @param aDuration The duration of the audio sample.
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     */
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    void MapcInitComplete(
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        TInt aError,
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        const TTimeIntervalMicroSeconds& aDuration );
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    /**
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     * From MMdaAudioPlayerCallback.
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     * Callback when an attempt to playback an audio sample has completed.
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     *
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     * @param aError The status of playback.
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     */
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    void MapcPlayComplete( TInt aError );
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private:    // Data
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    // Pointer to the equalizer utility we use. 
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    // This is either the equalizer utility provided by Music
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    // Player Engine or iBackupEqualizerUtility.
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    CAudioEqualizerUtility* iEqualizerUtility;          // not owned
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    // Play utility used to open the 'null sound' file and
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    // create iBackupEqualizerUtility
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    CMdaAudioPlayerUtility* iPlayUtility;               // owned
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    // Equalizer utility for the active playback utility
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    CAudioEqualizerUtility* iAudioEqualizerUtility;     // owned
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    // Backup equalizer utility instance used when the equalizer custom
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    // interface cannot be created by using the active play utility
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    CAudioEqualizerUtility* iBackupEqualizerUtility;   // owned
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    // Current playback utility
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    MMPXPlaybackUtility* iPlaybackUtility;  // not own, but need to close
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    CEqualizerPresetsDialog* iEqDialog;     // not own
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    // Should be launch equalizer dialog on open complete callback
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    TBool iLaunchEqualizerOnOpenComplete;
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    // iPlayUtility->OpenL() has been called but not yet completed
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    TBool iOpenInProgress;
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    // Used to syncronize backup equalizer creation and dialog launching
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    CActiveSchedulerWait* iWait;
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    };
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#endif  // C_MPXEQUALIZERHELPER_H
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// End of File