rvroundtripstats.h

h.248协议源码

/******************************************************************************
Filename:    rvroundtripstats.h
Description: class to keep round trip time statistics and compute 
             retransmission timeouts as outlined in RFC2988
*******************************************************************************
                Copyright (c) 2001 RADVision Inc.
*******************************************************************************
NOTICE:
This document contains information that is proprietary to RADVision Inc.
No part of this publication may be reproduced in any form whatsoever without
written prior approval by RADVision Inc.

RADVision Inc. reserves the right to revise this publication and make changes
without obligation to notify any person of such revisions or changes.
******************************************************************************/

#ifndef RV_ROUNDTRIPSTATS_H
#define RV_ROUNDTRIPSTATS_H

#include "rvtypes.h"
#include "rvtime.h"
#include "rvrandomgenerator.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef struct
{
	RvHrtime initial, min, max;
} RvRetransTimeoutLimits;

RvRetransTimeoutLimits *rvRetransTimeoutLimitsConstruct(RvRetransTimeoutLimits *limits,
	RvHrtime initial, RvHrtime min, RvHrtime max);
#define rvRetransTimeoutLimitsConstructCopy rvDefaultConstructCopy
#define rvRetransTimeoutLimitsDestruct rvDefaultDestruct


typedef struct
{
	RvBool valid;
	RvHrtime srtt;
	RvHrtime rttvar;
	unsigned int k;
	RvRandomGenerator *randGen;
} RvRoundTripStats;

RvRoundTripStats *rvRoundTripStatsConstruct(RvRoundTripStats *stats, RvRandomGenerator *randomGenerator);
#define rvRoundTripStatsConstructCopy rvDefaultConstructCopy
#define rvRoundTripStatsDestruct rvDefaultDestruct
void rvRoundTripStatsUpdate(RvRoundTripStats *stats, RvHrtime roundTripTime);
RvHrtime rvRoundTripStatsGetFirstRetransTimeout(RvRoundTripStats *stats, const RvRetransTimeoutLimits *limits);
RvHrtime rvRoundTripStatsGetNextRetransTimeout(RvRoundTripStats *stats, const RvRetransTimeoutLimits *limits);
unsigned int rvRoundTripStatsGetDeviationMultiplier(const RvRoundTripStats *stats);
void rvRoundTripStatsSetDeviationMultiplier(RvRoundTripStats *stats, unsigned int k);

#ifdef __cplusplus
}
#endif

#endif