Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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/*
* CVHostTime.h
* CoreVideo
*
* Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
*
*/
/*! @header CVHostTime.h
@copyright 2004 Apple Computer, Inc. All rights reserved.
@availability Mac OS X 10.4 or later
@discussion Utility functions for retrieving and working with the host time.
*/
#if !defined(__COREVIDEO_CVHOSTTIME_H__)
#define __COREVIDEO_CVHOSTTIME_H__ 1
#include <TargetConditionals.h>
#if TARGET_OS_MAC
#include <QuartzCore/CVBase.h>
#else
#include <CVBase.h>
#endif
#if defined(__cplusplus)
extern "C" {
#endif
/*!
@function CVGetCurrentHostTime
@abstract Retrieve the current value of the host time base.
@discussion On Mac OS X, the host time base for CoreVideo and CoreAudio are identical, and the values returned from either API
may be used interchangeably.
@result The current host time.
*/
extern uint64_t CVGetCurrentHostTime() AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
/*!
@function CVGetHostClockFrequency
@abstract Retrieve the frequency of the host time base.
@discussion On Mac OS X, the host time base for CoreVideo and CoreAudio are identical, and the values returned from either API
may be used interchangeably.
@result The current host frequency.
*/
extern double CVGetHostClockFrequency() AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
/*!
@function CVGetHostClockMinimumTimeDelta
@abstract Retrieve the smallest possible increment in the host time base.
@result The smallest valid increment in the host time base.
*/
extern uint32_t CVGetHostClockMinimumTimeDelta() AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
#if defined(__cplusplus)
}
#endif
#endif