/*

* Copyright (c) 2006-2007 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:  ?Description

*

*/

#ifndef IRCTRLCOMMAND_H

#define IRCTRLCOMMAND_H

#include <e32cmn.h>

#include "ircontrolparams.h"

/**

* Class is an abstract class which provides interfaces to pass commands

* MCtrlCommand can pass a command and value to the inherited class

* FetchVolume is meant for fetching the volume

* DoAudioFadeOut is to activate Fade out fade in effect

*/

class MIRCtrlCmdObserver

    {

public:

    /**

     * Function : MCrtlCmdCommand

     * Function is pure virtual function which used to pass commands

     * @param TIRControlCommmand represents the commands,which determines 

     * what action to be taken

     * @param aValue represents any integer value if any, like buffering

     * percentage

     */

    virtual void MCtrlCommand( TIRControlCommmand aCommand, TInt aValue ) = 0;

    /**

     * Function : FetchVolume

     * Function is pure virtual function which sents Request to get the

     * current volume index

     * @return volume index

     */

    virtual TInt FetchVolume() = 0;

    /**

     * Function : DoAudioFadeOut

     * Function is pure virtual function, it is used to sent request start 

     * audio Fade Out

     */

    virtual void DoAudioFadeOut() = 0;

    /**

     * Function : PlayerChanged()

     * Function is pure virtual function, It notifies the Observer WhenEver

	* Player Changed

     * audio Fade Out

     */

    virtual void PlayerChanged() = 0;

    };

/**

* Class is an abstract class which provides interfaces to fill the buffer

* Request to fill the buffer is made through this interface

*/

class MIRStreamFill

    {

public:

    /**

     * Function: FilltheBuffer

     * function is pure virtual implementation of and is call to fill

     * the buffer 

     * @param reference to the buffer to be filled with data

     */

    virtual void FilltheBuffer(TDes8& aInputBuffer) = 0;

    };

#endif //IRCTRLCOMMAND_H