mmlibs/mmfw/Effect/inc/mmf/plugin/MmfGlblAudioEffectPlugin.h
author Tapani Kanerva <tapani.kanerva@nice.fi>
Tue, 16 Nov 2010 14:11:25 +0200
branchRCL_3
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parent 0 40261b775718
permissions -rw-r--r--
Bug 3673 - Seeking via grabbing the Music Player progress bar does not work.
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// MmfGlblAudioEffectPlugin.h
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// Copyright (c) 2005-2009 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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#ifndef MMFGLBLAUDIOEFFECTPLUGIN_H
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#define MMFGLBLAUDIOEFFECTPLUGIN_H
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#include <mmf/common/mmfglblaudioeffect.h>
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/**
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@publishedPartner
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@released
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@file
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*/
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/**
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Implementation of CMmfGlobalAudioEffect.
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This is the base interface for plugins that provide for global effects. It is intended
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to be exclusively called from CMmfGlobalAudioEffect itself.
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 */
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class MMmfGlobalAudioImpl
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	{
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	friend class CMmfGlobalAudioEffect; 
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public:
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	/**
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	Release object.
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	Equivalent of destructor - called to request data to be deleted.
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	*/
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	virtual void Release()=0;
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protected:
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	/*
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	Provide implementation of CMmfGlobalAudioEffect::Capability()
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	@param aCurrentOnly
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	       If true, capabilities are for current situation only - see text
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	@return Capability settings, as given in TCapabilityFlags
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	@see CMmfGlobalAudioEffect::Capability()
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	*/	
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	virtual TUint Capability(TBool aCurrentOnly)=0;
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::RequestNotificationL()
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	@param aEventUid
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	       Uid specifying event for which notification is requested
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	@leave KErrNotSupported
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	       If Observer passed during construction was NULL.
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	       The Uid is not recognised.
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	       The feature is simply not supported in this implementation.
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	@see CMmfGlobalAudioEffect::RequestNotificationL()
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	*/
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	virtual void RequestNotificationL(TUid aEventUid)=0;
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::IsEnabled()
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	@return True if SetEnabledL(ETrue), or similar, has been called on this effect
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	@see CMmfGlobalAudioEffect::IsEnabled()
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	*/
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	virtual TBool IsEnabled() const=0;
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::IsActive()
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	@return True if the effect is in use
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	@see CMmfGlobalAudioEffect::IsActive()
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	*/
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	virtual TBool IsActive() const=0;
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::SetEnabledL()
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	@param aValue
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	       If true, enables this specific effect. If false, disables it. 
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	@see CMmfGlobalAudioEffect::SetEnabledL()
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	*/
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	virtual void SetEnabledL(TBool aValue)=0;
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::SettingsByUidL()
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	@return The Uid used by SetSettingsByUidL()
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	@leave KErrNotSupported
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	       The settings cannot be expressed as a Uid (usually means SetSettingsByUidL() was not the last
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	       thing to change them).
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	@see CMmfGlobalAudioEffect::SettingsByUidL()
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	*/
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	virtual TUid SettingsByUidL() const=0;
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::SetSettingsByUidL()
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	@param aPresetUid
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	       Uid representing the preset in question
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	@leave KErrNotSupported
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	       This implementation does not support presets for this effect
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	@leave KErrUnknown
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	       The value of aUid does not correspond to a known preset
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	@see CMmfGlobalAudioEffect::SetSettingsByUidL()
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	*/
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	virtual void SetSettingsByUidL(TUid aPresetUid)=0;
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::SettingsByDesL()
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	@return HBufC8 containing current settings
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	@leave KErrNotSupported
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	       This implementation does not support expressing settings in descriptor form
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	@see CMmfGlobalAudioEffect::SettingsByDesL()
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	*/
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	virtual HBufC8* SettingsByDesL() const=0;
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   122
	
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::SetSettingsByDesL()
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	@param aParam
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	       Descriptor value to use
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	@leave KErrNotSupported
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	       This implementation does not support expressing settings in descriptor form
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	@leave KErrCorrupt
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	       Value in descriptor does not correspond to known format
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	@see CMmfGlobalAudioEffect::SetSettingsByDesL()	  
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	*/
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	virtual void SetSettingsByDesL(const TDesC8& aParam)=0;
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::KnownPresetsL()
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	@see CMmfGlobalAudioEffect::KnownPresetsL()
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	@leave KErrNotSupported
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	       This feature may not be supported in some circumstances
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	*/
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	virtual MMmfGlobalAudioPresetList* KnownPresetsL()=0;
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   142
	
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::ExtractValuesL()
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	Extract the settings into a struct
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	Note that the implementation should check the size of the supplied package buffer, to check
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	it is as expected.
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	@param aPackageBuf
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	       This should be a package buffer wrapping the appropriate class/struct, and will be 
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	       specific to a particular CMmfGlobalAudioEffect derivitive.
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	@leave KErrNotSupported
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	       This will only be supported by some child classes, and even then will not
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	       be supported by all implementations.
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	@leave KErrArgument
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		   Passed package buffer is not the expected size.
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	@see CMmfGlobalAudioEffect::ExtractValuesL()
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	*/
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	virtual void ExtractValuesL(TDes8& aPackageBuf)=0;
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	/**
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	Provide implementation of CMmfGlobalAudioEffect::SetByValuesL().
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	Note that the implementation should check the size of the supplied package buffer, to check
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	it is as expected.
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	@param aPackageBuf
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	       This should be a package buffer wrapping the appropriate class/struct, and will be 
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	       specific to a particular CMmfGlobalAudioEffect derivitive.
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	@leave KErrNotSupported
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	       This will only be supported by some child classes, and even then will not
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	       be supported by all implementations.
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	@leave KErrArgument
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		   Passed package buffer is not the expected size, or individual values are out of range
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	@see CMmfGlobalAudioEffect::SetByValuesL()
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	*/
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	virtual void SetByValuesL(const TDesC8& aPackageBuf)=0;
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	/**
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	Request extension feature.
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	This is intended to provide additional features, should a particular global effect
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	need it. In typical use, the global effect will make a call to this interface on
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	construction. Repeatedly calling this interface will have no additional effect -
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	if the interface has already been setup internally, then no further activity will
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	take place.
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	@param aInterfaceUid
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	       Used to indicate which interface is required. 
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	@return Standard error code. KErrNotSupported is used to indicate that the particular
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	        plugin is used.
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	*/
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	virtual TInt CreateCustomInterface(TUid aInterfaceUid)=0;
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   190
	
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	/**
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	Return previously created extension.
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	This returns a custom interface, used to provide additional features for a certain
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	global effect. This should only be used if CreateCustomInterface() has already
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	been called for the same UID value. This means that any construction for that interface
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	has already been called, and thus this call cannot fail. Typically the returned class 
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	will be another Mixin.No transfer of ownership is implied. 
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	@param aInterfaceUid
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	       Used to indicate which interface is required. 
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	@return The requested interface, or NULL if not known.
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	@see CreateCustomInterface()
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	*/
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	virtual TAny* CustomInterface(TUid aInterfaceUid)=0;
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	/**
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	Pass destructor key.
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	Called on construction so plugin takes responsibility to call REComSession::DestroyedImplementation()
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	@param aDestructorKey
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	       The Uid returned by REComSession::CreateImplementationL() or similar
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	*/
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	virtual void PassDestructorKey(TUid aDestructorKey)=0;
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	/**
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	Complete construction.
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	Pass additional values from the construction phase, used subsequently by the plugin.
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	@param aParent
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	       The CMmfGlobalAudioEffect that created this object
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	@param aObserver
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	       Observer as passed to CMmfGlobalAudioEffect::BaseConstructL()
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	@see CMmfGlobalAudioEffect::BaseConstructL()
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	*/
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	virtual void CompleteConstructL(CMmfGlobalAudioEffect* aParent, MMmfGlobalAudioEffectObserver* aObserver)=0;
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private:
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	static MMmfGlobalAudioImpl* NewL(TUid aImplementationUid, 
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									 CMmfGlobalAudioEffect* aParent,
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	                                 MMmfGlobalAudioEffectObserver* aObserver);
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	};
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#endif // MMFGLBLAUDIOEFFECTPLUGIN_