/*

* Copyright (c) 2010 Ixonos Plc.

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - Initial contribution

*

* Contributors:

* Ixonos Plc

*

* Description:

*

*/

#ifndef __CPROCMP3FRAMEHANDLER_H__

#define __CPROCMP3FRAMEHANDLER_H__

/*-- System Headers. --*/

#include <e32base.h>

/*-- Project Headers. --*/

#include "AudCommon.h"

#include "ProcFrameHandler.h"

#include "ProcInFileHandler.h"

#include "MP3API.h"

/**

 * Frame handler class for accessing MP3 data elements.

 *

 * @author  Juha Ojanperä

 */

class CProcMP3FrameHandler : public CProcFrameHandler 

    {

public:

    /*

    * Constructors & destructor

    */

    static CProcMP3FrameHandler* NewL();

    static CProcMP3FrameHandler* NewLC();

    ~CProcMP3FrameHandler();

    // From base class CProcFrameHandler ---------->

    TBool ManipulateGainL(const HBufC8* aFrameIn, HBufC8*& aFrameOut, TInt8 aGain);

    TBool GetGainL(const HBufC8* aFrame, RArray<TInt>& aGains, TInt& aMaxGain) const;

    TBool GetNormalizingMargin(const HBufC8* aFrame, TInt8& aMargin) const;

    TBool IsMixingAvailable() const;

    // <--------------------------------------------

private:

    // ConstructL

    void ConstructL();

    // c++ constructor

    CProcMP3FrameHandler();

    // internal function for reading MP3 gains

    TBool GetMP3Gains(const HBufC8* aFrame, RArray<TInt>& aGains, TInt& aMaxGain, TBitStream& aBs) const;

private:

    // a handle to MP3 editing class in MP3AACManipLib

    CMp3Edit* iMp3Edit;

    // a flag to indicate whether MP3 decoder is initialized

    mutable TBool decInitialized;

    // a handle to CMPAudDec

    CMPAudDec *iMpAud;

    TMpTransportHandle *iTHandle;

    friend class CProcMP3InFileHandler;

    };

#endif /*-- __CPROCMP3FRAMEHANDLER_H__ --*/