/*

#ifndef CNGGENERATOR_H

#define CNGGENERATOR_H

#include <mmfutilities.h>

// FORWARD DECLARATIONS

class MJitterBufferObserver;

/**

 * Comfort noise generating utility

 *

 * @lib MMccJitterBuffer.lib

 */

NONSHARABLE_CLASS (CVoIPCNGenerator) : public CBase

    {

    /**

     * Two phased constructor

     */

    static CVoIPCNGenerator* NewL(MJitterBufferObserver* iObserver,

    /**

     * Destructor

     */

    virtual ~CVoIPCNGenerator();

    /**

     * Generates an SID packet to given buffer

     * @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.

     * @param None

     * @return void

     */

    void ConcealErrorForNextFrame() const;

    /**

     * Returns current DTX status

     * @param None

     * @return TBool ETrue if DTX period ongoing

     */

    TBool DtxPeriodStatus() const;

    /**

     * Decide whether we are in DTX period or in normal speech period

     * @param const TDes8& - Buffer containing data

     * @return TInt

     */

    void DoDtxDecision(const TDes8& aPayload);

    /**

     * Checks whether buffer contains SID frame.

     * @param const TDes8& - Buffer containing data

     * @return TBool - ETrue if buffer contains SID frame

     */

    TBool IsSidBuffer(const TDes8& aData);

    /**

     * Generates an AMR CN packet into aPayload

     * @param aPayload

     * @return void

     */

    void GenerateAmrNoDataPacket(TDes8& aPayload) const;

    /**

     * Generates an VoIP NO_DATA frame into aPayload

     * @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;

    /**

     * C++ default constructor.

     */

    CVoIPCNGenerator(MJitterBufferObserver* iObserver, const TFourCC& aCodec);

    /**

     * Symbian 2nd phase constructor.

     */

    void ConstructL();

    // 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