VideoWrapperTime.cpp File Reference

Implements time functions to support video wrappers. More...

#include "VideoWrapperTime.h"

Functions
int	vw_gettimeofday (timeval *tp, struct timezone *tzp)
	Implementation of 'gettimeofday'.
timeval	TimevalSum (const timeval &tv1, const timeval &tv2)
	Calculates the sum of tv1 and tv2.
timeval	TimevalDiff (const timeval &tv1, const timeval &tv2)
	Calculates the diff between tv1 and tv2.
int	TimevalGreater (const timeval &tv1, const timeval &tv2)
	Tests two timeval structures for a greater-than relationship.
int	TimevalEqual (const timeval &tv1, const timeval &tv2)
	Tests two timeval structures for equality.
double	TimevalMsecs (const timeval &tv)
	Converts a timeval structure to milliseonds.
timeval	MsecsTimeval (const double dMsecs)
	Converts milliseconds to a timeval structure.

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Detailed Description

Implements time functions to support video wrappers.

Most functions have been copied from VRPN. Copyright 2005, Georgia Tech Research Corporation, Atlanta, Georgia 30332-0415 All Rights Reserved

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Function Documentation

timeval MsecsTimeval (  const double  dMsecs  )

Converts milliseconds to a timeval structure. Parameters: dMsecs  Milliseconds. Returns: timeval equivalent to dMsecs.

timeval TimevalDiff (  const timeval &  tv1, const timeval &  tv2 )

Calculates the diff between tv1 and tv2. Returns the diff in a timeval struct. Calculates negative times properly, with the appropriate sign on both tv_sec and tv_usec (these signs will match unless one of them is 0) Parameters: tv1  a timeval structure. tv2  another timeval structure. Returns: Returns diff of tv1 and tv2.

int TimevalEqual (  const timeval &  tv1, const timeval &  tv2 )

Tests two timeval structures for equality. Parameters: tv1  a timeval structure. tv2  another timeval structure. Returns: Returns 1 if tv1 is equal to tv2; 0 otherwise.

int TimevalGreater (  const timeval &  tv1, const timeval &  tv2 )

Tests two timeval structures for a greater-than relationship. Parameters: tv1  a timeval structure. tv2  another timeval structure. Returns: Returns 1 if tv1 is greater than tv2; 0 otherwise.

double TimevalMsecs (  const timeval &  tv  )

Converts a timeval structure to milliseonds. Parameters: tv  a timeval structure. Returns: Milliseconds equivalent to tv.

timeval TimevalSum (  const timeval &  tv1, const timeval &  tv2 )

Calculates the sum of tv1 and tv2. Returns the sum in an timeval struct. Calculates negative times properly, with the appropriate sign on both tv_sec and tv_usec (these signs will match unless one of them is 0). NOTE: both abs(tv_usec)'s must be < 1000000 (ie, normal timeval format) Parameters: tv1  a timeval structure. tv2  another timeval structure. Returns: Sub of tv1 and tv2.

int vw_gettimeofday (  timeval *  tp, struct timezone *  tzp )

Implementation of 'gettimeofday'. Although VC++ doesn't include a gettimeofday call, Cygnus Solutions Cygwin32 environment does, so this is not used when compiling with gcc under WIN32. Parameters: [out]  tp  Pointer to a timeval structure receiving the current time. [out]  tzp  Pointer to a timezon structure receiving the current time zone information. Returns: Returns 0 if successful.

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