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//------------------------------------------------------------------------------
// File: RefTime.h
//
// Desc: DirectShow base classes - defines CRefTime, a class that manages
// reference times.
//
// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
//
// CRefTime
//
// Manage reference times.
// Shares same data layout as REFERENCE_TIME, but adds some (nonvirtual)
// functions providing simple comparison, conversion and arithmetic.
//
// A reference time (at the moment) is a unit of seconds represented in
// 100ns units as is used in the Win32 FILETIME structure. BUT the time
// a REFERENCE_TIME represents is NOT the time elapsed since 1/1/1601 it
// will either be stream time or reference time depending upon context
//
// This class provides simple arithmetic operations on reference times
//
// keep non-virtual otherwise the data layout will not be the same as
// REFERENCE_TIME
// -----
// note that you are safe to cast a CRefTime* to a REFERENCE_TIME*, but
// you will need to do so explicitly
// -----
#ifndef __REFTIME__
#define __REFTIME__
const LONGLONG MILLISECONDS = (1000); // 10 ^ 3
const LONGLONG NANOSECONDS = (1000000000); // 10 ^ 9
const LONGLONG UNITS = (NANOSECONDS / 100); // 10 ^ 7
/* Unfortunately an inline function here generates a call to __allmul
- even for constants!
*/
#define MILLISECONDS_TO_100NS_UNITS(lMs) \
Int32x32To64((lMs), (UNITS / MILLISECONDS))
class CRefTime
{
public:
// *MUST* be the only data member so that this class is exactly
// equivalent to a REFERENCE_TIME.
// Also, must be *no virtual functions*
REFERENCE_TIME m_time;
inline CRefTime() {
// default to 0 time
m_time = 0;
};
inline CRefTime(LONG msecs) {
m_time = MILLISECONDS_TO_100NS_UNITS(msecs);
};
inline CRefTime(REFERENCE_TIME rt) {
m_time = rt;
};
inline operator REFERENCE_TIME() const {
return m_time;
};
inline CRefTime& operator=(const CRefTime& rt) {
m_time = rt.m_time;
return *this;
};
inline CRefTime& operator=(const LONGLONG ll) {
m_time = ll;
return *this;
};
inline CRefTime& operator+=(const CRefTime& rt) {
return (*this = *this + rt);
};
inline CRefTime& operator-=(const CRefTime& rt) {
return (*this = *this - rt);
};
inline LONG Millisecs(void) {
return (LONG)(m_time / (UNITS / MILLISECONDS));
};
inline LONGLONG GetUnits(void) {
return m_time;
};
};
const LONGLONG TimeZero = 0;
#endif /* __REFTIME__ */
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