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/* -*- C++ -*- */
// $Id$
/*
* Copyright (c) 1995 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Network Research
* Group at Lawrence Berkeley National Laboratory.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#) $Header$
*/
#ifndef TAO_AV_NTP_TIME_H
#define TAO_AV_NTP_TIME_H
#include "ace/OS.h"
#include "RTCP.h"
/*
* convert microseconds to fraction of second * 2^32 (i.e., the lsw of
* a 64-bit ntp timestamp). This routine uses the factorization
* 2^32/10^6 = 4096 + 256 - 1825/32 which results in a max conversion
* error of 3 * 10^-7 and an average error of half that.
*/
ACE_INLINE u_int usec2ntp(u_int usec)
{
u_int t = (usec * 1825) >> 5;
return ((usec << 12) + (usec << 8) - t);
}
/*
* Number of seconds between 1-Jan-1900 and 1-Jan-1970
*/
const ACE_UINT32 GETTIMEOFDAY_TO_NTP_OFFSET = 2208988800U;
/*
* Return a 64-bit ntp timestamp (UTC time relative to Jan 1, 1970).
* gettimeofday conveniently gives us the correct reference -- we just
* need to convert sec+usec to a 64-bit fixed point (with binary point
* at bit 32).
*/
ACE_INLINE TAO_AV_RTCP::ntp64
ntp64time (timeval tv)
{
TAO_AV_RTCP::ntp64 n;
n.upper = (u_int)tv.tv_sec + GETTIMEOFDAY_TO_NTP_OFFSET;
n.lower = usec2ntp((u_int)tv.tv_usec);
return (n);
}
ACE_INLINE ACE_UINT32
ntptime (timeval t)
{
u_int s = (u_int)t.tv_sec + GETTIMEOFDAY_TO_NTP_OFFSET;
return (s << 16 | usec2ntp((u_int)t.tv_usec) >> 16);
}
ACE_INLINE ACE_UINT32
ntptime()
{
//
ACE_Time_Value tim_v = ACE_OS::gettimeofday();
//struct timeval tv = (timeval) tim_v;
return (ntptime ((timeval) tim_v));
}
ACE_INLINE timeval unixtime()
{
ACE_Time_Value tv = ACE_OS::gettimeofday();
return ((timeval) tv);
}
#endif /* TAO_AV_NTP_TIME_H */
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