/*

* Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "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:

*

* Description:    

*

*/

#ifndef AMRPAYLOADHEADER_H

#define AMRPAYLOADHEADER_H

#include <e32base.h>

#include "amrpayloadformatter.h"

// FORWARD DECLARATIONS

class TStreamEncoder;

class TStreamDecoder;

// MACROS

// CLASS DECLARATION

/**

* The Amr payload header in bandwidth efficient mode.

*

* @lib Mccamrplformat.dll

* @since Series 60 3.1

*/

class CAmrPayloadHeader : public CBase

    {

public:  // Constructors and destructor

    public:  // Constructors and destructor

    /**

    * Two-phased constructor.

    */

    static CAmrPayloadHeader* NewL();

    /**

    * Destructor.

    */

    ~CAmrPayloadHeader();

public: // New functions

    /**

    * Encode the payload header fields into a given buffer at the given

    * position. Values to encode are obtained from the corresponding 

    * header fields. Byte and bit positions are updated after encoding 

    * is done.

    * @since    Series 60 3.1

    * @param    aBuffer - [output] Buffer to store encoded data.

    * @param    aByteIndex - [input] Starting byte index ( starts from

    *           zero ).

    *           [output] Byte index updated after encoding.

    * @param    aBitIndex - [input] Starting bit index 

    *                        ( starts from zero ).

    *           [output] Bit index updated after encoding.

    */

    virtual void Encode( TUint8* aBuffer, TInt& aByteIndex,

        TInt& aBitIndex );

    /**

    * Decode the payload header from a given buffer at the given position.

    * Decoded values are returned in the corresponding header fields.

    * Byte and bit positions are updated after decoding is done.

    * @since    Series 60 3.1

    * @param    aBuffer - [input] Buffer to decode data from.

    * @param    aByteIndex - [input] Starting byte index ( starts from

    *           zero ).

    *           [output] Byte index updated after decoding.

    * @param    aBitIndex - [input] Starting bit index 

    *                         ( starts from zero ).

    *           [output] Bit index updated after decoding.

    */

    virtual void Decode( const TUint8* aBuffer, TInt& aByteIndex, 

            TInt& aBitIndex );

protected: // Functions

    /**

    * Constructor.

    */

    CAmrPayloadHeader();

public:     // Data. Payload header fields

    // Codec mode request ( CMR, 4 bits )

    TAmrModeRequest iCmr;  

    };

#endif      // AMRPAYLOADHEADER_H