80 lines
3.9 KiB
C
80 lines
3.9 KiB
C
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/*****************************************************************************
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* vlc_mtime.h: high resolution time management functions
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*****************************************************************************
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* This header provides portable high precision time management functions,
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* which should be the only ones used in other segments of the program, since
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* functions like gettimeofday() and ftime() are not always supported.
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* Most functions are declared as inline or as macros since they are only
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* interfaces to system calls and have to be called frequently.
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* 'm' stands for 'micro', since maximum resolution is the microsecond.
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* Functions prototyped are implemented in interface/mtime.c.
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*****************************************************************************
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* Copyright (C) 1996, 1997, 1998, 1999, 2000 VLC authors and VideoLAN
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* $Id: ab89a972120c8ee3f45d9823994eac584f8fe527 $
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*
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* Authors: Vincent Seguin <seguin@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef __VLC_MTIME_H
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# define __VLC_MTIME_H 1
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/*****************************************************************************
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* LAST_MDATE: date which will never happen
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*****************************************************************************
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* This date can be used as a 'never' date, to mark missing events in a function
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* supposed to return a date, such as nothing to display in a function
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* returning the date of the first image to be displayed. It can be used in
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* comparaison with other values: all existing dates will be earlier.
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*****************************************************************************/
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#define LAST_MDATE ((mtime_t)((uint64_t)(-1)/2))
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/*****************************************************************************
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* MSTRTIME_MAX_SIZE: maximum possible size of mstrtime
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*****************************************************************************
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* This values is the maximal possible size of the string returned by the
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* mstrtime() function, including '-' and the final '\0'. It should be used to
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* allocate the buffer.
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*****************************************************************************/
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#define MSTRTIME_MAX_SIZE 22
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/*****************************************************************************
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* Prototypes
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*****************************************************************************/
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VLC_API char * mstrtime( char *psz_buffer, mtime_t date );
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VLC_API char * secstotimestr( char *psz_buffer, int32_t secs );
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/*****************************************************************************
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* date_t: date incrementation without long-term rounding errors
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*****************************************************************************/
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struct date_t
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{
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mtime_t date;
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uint32_t i_divider_num;
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uint32_t i_divider_den;
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uint32_t i_remainder;
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};
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VLC_API void date_Init( date_t *, uint32_t, uint32_t );
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VLC_API void date_Change( date_t *, uint32_t, uint32_t );
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VLC_API void date_Set( date_t *, mtime_t );
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VLC_API mtime_t date_Get( const date_t * );
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VLC_API void date_Move( date_t *, mtime_t );
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VLC_API mtime_t date_Increment( date_t *, uint32_t );
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VLC_API mtime_t date_Decrement( date_t *, uint32_t );
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VLC_API uint64_t NTPtime64( void );
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#endif /* !__VLC_MTIME_ */
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