/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: servrsnd.h,v 1.1.1.1.50.1 2004/07/09 02:04:37 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * The contents of this file, and the files included with this file,
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 * the file under the current version of the RealNetworks Community
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 * will apply. You may also obtain the license terms directly from
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 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
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 * Alternatively, the contents of this file may be used under the
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 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
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 * ***** END LICENSE BLOCK ***** */

#ifndef _SERVER_RESEND_H_
#define _SERVER_RESEND_H_

class HX_deque;
class BasePacket;

class RTSPResendBuffer
{
public:
    RTSPResendBuffer(UINT32 bufferDuration, UINT32 maxBufferDuration,
                     UINT32 growthRate, UINT32 wrapSequenceNumber);
    ~RTSPResendBuffer();

    void		Clear();
    void		Grow();
    void		Add(BasePacket* pPacket);
    void		Remove(UINT16 uSeqNo);
    BasePacket*		Find(UINT16 uSeqNo, BOOL bIsNAK);
    void		SetFirstSequenceNumber(UINT16 uSeqNo);
    UINT32		GetIndex(UINT32 uBaseSequenceNumber, UINT16 uSeqNo);
    UINT32		GetPacketIndex(UINT16 uSeqNo);
    UINT32		GetForceIndex(UINT16 uSeqNo);
    void		DiscardExpiredPackets(BOOL bForce,
			                      UINT32 uParameter);
    void		SetBufferDepth(UINT32 uMilliseconds);
    void		SetMaxBufferDepth(UINT32 uMilliseconds);
    HX_RESULT		UpdateStatistics(UINT32& ulResendSuccess,
			                 UINT32& ulResendFailure);

private:
    HX_deque*		m_pPacketDeque;
    UINT32		m_bufferDuration;
    UINT32		m_maxBufferDuration;
    UINT32		m_growthRate;
    UINT32		m_wrapSequenceNumber;
    UINT16		m_uFirstSequenceNumber;
    UINT16		m_uForceSequenceNumber;
    UINT32		m_ulResendSuccess;
    UINT32		m_ulResendFailure;
    BOOL		m_bSetFirstSequenceNumber;
};

inline UINT32
RTSPResendBuffer::GetPacketIndex(UINT16 uSeqNo)
{
    return GetIndex(m_uFirstSequenceNumber, uSeqNo);
}

inline UINT32
RTSPResendBuffer::GetForceIndex(UINT16 uSeqNo)
{
    return GetIndex(m_uForceSequenceNumber, uSeqNo);
}

#endif /* _SERVER_RESEND_H_ */
