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55 lines
3.1 KiB
55 lines
3.1 KiB
/*******************************************************************************
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* mtime.h: high rezolution time management functions
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* (c)1999 VideoLAN
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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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* Required headers:
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* none
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* this header includes inline functions
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*******************************************************************************/
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/*******************************************************************************
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* mtime_t: high precision date or time interval
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*******************************************************************************
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* Store an high precision date or time interval. The maximum precision is the
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* micro-second, and a 64 bits integer is used to avoid any overflow (maximum
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* time interval is then 292271 years, which should be length enough for any
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* video). Date are stored as a time interval since a common date.
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* Note that date and time intervals can be manipulated using regular arithmetic
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* operators, and that no special functions are required.
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*******************************************************************************/
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typedef s64 mtime_t;
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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)((u64)(-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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char * mstrtime ( char *psz_buffer, mtime_t date );
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mtime_t mdate ( void );
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void mwait ( mtime_t date );
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void msleep ( mtime_t delay );
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