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/*
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* Copyright (c) 2007-2009 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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*/
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#ifndef AUDIOGAINCONTROL_H
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#define AUDIOGAINCONTROL_H
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#include <e32base.h>
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#include <a3f/a3fbase.h>
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#include <a3f/maudiogaincontrol.h>
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#include <a3f/maudiogaincontrolobserver.h>
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#include "mgainhelper.h"
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#include <a3f/a3f_trace_utils.h>
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const TUint KDefaultGain = 5;
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const TUint KDefaultMaxGain = 255; // TODO should discover at run time but this is value of current Symbian sound driver adaptor
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const TUint KDefaultNumChannels = 2;
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const TUint KDefaultMaxRampTime = 5;
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enum TGainControlPanicCode
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{
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EAdaptationOldSetGainCalledPanic,
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};
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/**
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* Implementation of audio gain control API.
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* ?more_complete_description
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* @lib audiogaincontrol.lib
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*/
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NONSHARABLE_CLASS(CAudioGainControl) : public CBase, public MAudioGainControl
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{
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public:
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IMPORT_C static CAudioGainControl* NewL();
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/**
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* Destructor.
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*
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* Deletes all objects and releases all resource owned by this instance.
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*/
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virtual ~CAudioGainControl();
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IMPORT_C void SetHelper(MGainHelper& aHelper);
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IMPORT_C void IssueGainChangedCallBack(TInt aError);
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IMPORT_C TInt ConfigureRamp(TUid aRampOperation, const TTimeIntervalMicroSeconds& aRampDuration);
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void IssueMaxGainChangedCallBack();
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void IssueMaxRampTimeChangedCallBack();
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// from base class MAudioGainControl
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TInt GetMaxGain(TInt& aMaxGain) const;
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TInt GetMaxRampTime(TTimeIntervalMicroSeconds& aMaxRampTime) const;
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TInt SetGain(RArray<TAudioChannelGain>& aChannels, TUid aRampOperation, const TTimeIntervalMicroSeconds& aRampDuration);
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TInt SetGain(RArray<TAudioChannelGain>& aChannels);
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TInt GetGain(RArray<TAudioChannelGain>& aChannels) const;
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TInt RegisterAudioGainControlObserver(MAudioGainControlObserver& aObserver);
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void UnregisterAudioGainControlObserver(MAudioGainControlObserver& aObserver);
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private:
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void ConstructL();
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CAudioGainControl();
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private: //data
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RArray<TAudioChannelGain> iGains;
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/**
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* Reference to observer instance
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*/
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RPointerArray<MAudioGainControlObserver> iGainObservers;
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// The gain cannot talk directly with the sound device driver so it needs a helper to request
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MGainHelper* iHelper;
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};
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#endif // AUDIOGAINCONTROL_H
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