/*
* Copyright (c) 2008 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: Declares class for comfort noise generating utility (CNG)
*
*/
#ifndef CNGGENERATOR_H
#define CNGGENERATOR_H
#include <mmfutilities.h>
// FORWARD DECLARATIONS
class MJitterBufferObserver;
/**
* Comfort noise generating utility
*
* @lib MMccJitterBuffer.lib
* @since Series 60 5.0
*/
NONSHARABLE_CLASS (CVoIPCNGenerator) : public CBase
{
public: // Constructor and destructor
/**
* Two phased constructor
*/
static CVoIPCNGenerator* NewL(MJitterBufferObserver* iObserver,
const TFourCC& aCodec);
/**
* Destructor
*/
virtual ~CVoIPCNGenerator();
public: // New functions
/**
* Generates an SID packet to given buffer
* @since Series 60 5.0
* @param aPayload Buffer to be filled with SID data
* @param aRequestSize Amount of data to be generated to buffer.
* @return void
*/
void GenerateSidPacket(TDes8& aPayload, TInt aRequestSize);
/**
* Requests error concealment for the next frame.
* @since Series 60 5.0
* @param None
* @return void
*/
void ConcealErrorForNextFrame() const;
/**
* Returns current DTX status
* @since Series 60 5.0
* @param None
* @return TBool ETrue if DTX period ongoing
*/
TBool DtxPeriodStatus() const;
/**
* Decide whether we are in DTX period or in normal speech period
* @since Series 60 5.0
* @param const TDes8& - Buffer containing data
* @return TInt
*/
void DoDtxDecision(const TDes8& aPayload);
/**
* Checks whether buffer contains SID frame.
* @since Series 60 5.0
* @param const TDes8& - Buffer containing data
* @return TBool - ETrue if buffer contains SID frame
*/
TBool IsSidBuffer(const TDes8& aData);
private: // New functions
/**
* Generates an AMR CN packet into aPayload
* @since Series 60 5.0
* @param aPayload
* @return void
*/
void GenerateAmrNoDataPacket(TDes8& aPayload) const;
/**
* Generates an VoIP NO_DATA frame into aPayload
* @since Series 60 5.0
* @param aPayload Buffer to be filled with VoIP NO_DATA information
* @param aRequestSize Amount of data to be generated to buffer.
* @return void
*/
void GenerateVoIPNoDataPacket(TDes8& aPayload, TInt aRequestSize) const;
private: //Constructors
/**
* C++ default constructor.
*/
CVoIPCNGenerator(MJitterBufferObserver* iObserver, const TFourCC& aCodec);
/**
* Symbian 2nd phase constructor.
*/
void ConstructL();
private: // Data
// Codec type
TFourCC iCodec;
// For Error Concealment IF creation
MJitterBufferObserver* iObserver;
// Generated CN frames
TInt iGeneratedCNFrames;
// DTX period started
TBool iDtxPeriodStarted;
};
#endif // CNGGENERATOR_H
// End of file