zoneminder/src/zm_time.h

208 lines
5.3 KiB
C

//
// ZoneMinder Time Functions & Definitions, $Date$, $Revision$
// Copyright (C) 2001-2008 Philip Coombes
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
#ifndef ZM_TIME_H
#define ZM_TIME_H
#include "zm.h"
#include <sys/time.h>
// Structure used for storing the results of the subtraction
// of one struct timeval from another
struct DeltaTimeval
{
bool positive;
unsigned long delta;
unsigned long sec;
unsigned long fsec;
unsigned long prec;
};
#define DT_GRAN_1000000 1000000
#define DT_PREC_6 DT_GRAN_1000000
#define DT_GRAN_100000 100000
#define DT_PREC_5 DT_GRAN_100000
#define DT_GRAN_10000 10000
#define DT_PREC_4 DT_GRAN_10000
#define DT_GRAN_1000 1000
#define DT_PREC_3 DT_GRAN_1000
#define DT_GRAN_100 100
#define DT_PREC_2 DT_GRAN_100
#define DT_GRAN_10 10
#define DT_PREC_1 DT_GRAN_10
#define DT_MAXGRAN DT_GRAN_1000000
// This obviously wouldn't work for massive deltas but as it's mostly
// for frames it will only usually be a fraction of a second or so
#define DELTA_TIMEVAL( result, time1, time2, precision ) \
{ \
int delta = (((time1).tv_sec-(time2).tv_sec)*(precision))+(((time1).tv_usec-(time2).tv_usec)/(DT_MAXGRAN/(precision))); \
result.positive = (delta>=0); \
result.delta = abs(delta); \
result.sec = result.delta/(precision); \
result.fsec = result.delta%(precision); \
result.prec = (precision); \
}
#define TIMEVAL_INTERVAL( result, time1, time2, precision ) \
{ \
int delta = (((time1).tv_sec-(time2).tv_sec)*(precision))+(((time1).tv_usec-(time2).tv_usec)/(DT_MAXGRAN/(precision))); \
result.positive = (delta>=0); \
result.delta = abs(delta); \
result.sec = result.delta/(precision); \
result.fsec = result.delta%(precision); \
result.prec = (precision); \
}
#define USEC_PER_SEC 1000000
#define MSEC_PER_SEC 1000
extern struct timeval tv;
inline int tvDiffUsec( struct timeval first, struct timeval last )
{
return( (last.tv_sec - first.tv_sec) * USEC_PER_SEC) + ((USEC_PER_SEC + last.tv_usec - first.tv_usec) - USEC_PER_SEC );
}
inline int tvDiffUsec( struct timeval first )
{
struct timeval now;
gettimeofday( &now, NULL );
return( tvDiffUsec( first, now ) );
}
inline int tvDiffMsec( struct timeval first, struct timeval last )
{
return( (last.tv_sec - first.tv_sec) * MSEC_PER_SEC) + (((MSEC_PER_SEC + last.tv_usec - first.tv_usec) / MSEC_PER_SEC) - MSEC_PER_SEC );
}
inline int tvDiffMsec( struct timeval first )
{
struct timeval now;
gettimeofday( &now, NULL );
return( tvDiffMsec( first, now ) );
}
inline double tvDiffSec( struct timeval first, struct timeval last )
{
return( double(last.tv_sec - first.tv_sec) + double(((USEC_PER_SEC + last.tv_usec - first.tv_usec) - USEC_PER_SEC) / (1.0*USEC_PER_SEC) ) );
}
inline double tvDiffSec( struct timeval first )
{
struct timeval now;
gettimeofday( &now, NULL );
return( tvDiffSec( first, now ) );
}
inline struct timeval tvZero()
{
struct timeval t = { 0, 0 };
return( t );
}
inline int tvIsZero( const struct timeval t )
{
return( t.tv_sec == 0 && t.tv_usec == 0 );
}
inline int tvCmp( struct timeval t1, struct timeval t2 )
{
if ( t1.tv_sec < t2.tv_sec )
return( -1 );
if ( t1.tv_sec > t2.tv_sec )
return( 1 );
if ( t1.tv_usec < t2.tv_usec )
return( -1 );
if ( t1.tv_usec > t2.tv_usec )
return( 1 );
return( 0 );
}
inline int tvEq( struct timeval t1, struct timeval t2 )
{
return( t1.tv_sec == t2.tv_sec && t1.tv_usec == t2.tv_usec );
}
inline struct timeval tvNow( void )
{
struct timeval t;
gettimeofday( &t, NULL );
return( t );
}
inline struct timeval tvCheck( struct timeval &t )
{
if ( t.tv_usec >= USEC_PER_SEC )
{
Warning( "Timestamp too large %ld.%ld\n", t.tv_sec, (long int) t.tv_usec );
t.tv_sec += t.tv_usec / USEC_PER_SEC;
t.tv_usec %= USEC_PER_SEC;
}
else if ( t.tv_usec < 0 )
{
Warning( "Got negative timestamp %ld.%ld\n", t.tv_sec, (long int)t.tv_usec );
t.tv_usec = 0;
}
return( t );
}
// Add t2 to t1
inline struct timeval tvAdd( struct timeval t1, struct timeval t2 )
{
tvCheck(t1);
tvCheck(t2);
t1.tv_sec += t2.tv_sec;
t1.tv_usec += t2.tv_usec;
if ( t1.tv_usec >= USEC_PER_SEC )
{
t1.tv_sec++;
t1.tv_usec -= USEC_PER_SEC;
}
return( t1 );
}
// Subtract t2 from t1
inline struct timeval tvSub( struct timeval t1, struct timeval t2 )
{
tvCheck(t1);
tvCheck(t2);
t1.tv_sec -= t2.tv_sec;
t1.tv_usec -= t2.tv_usec;
if ( t1.tv_usec < 0 )
{
t1.tv_sec--;
t1.tv_usec += USEC_PER_SEC;
}
return( t1 ) ;
}
inline struct timeval tvMake( time_t sec, suseconds_t usec )
{
struct timeval t;
t.tv_sec = sec;
t.tv_usec = usec;
return( t );
}
#endif // ZM_TIME_H