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60 lines
1.7 KiB
60 lines
1.7 KiB
5 years ago
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/*
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* CVHostTime.h
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* CoreVideo
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*
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* Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
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*
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*/
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/*! @header CVHostTime.h
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@copyright 2004 Apple Computer, Inc. All rights reserved.
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@availability Mac OS X 10.4 or later
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@discussion Utility functions for retrieving and working with the host time.
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*/
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#if !defined(__COREVIDEO_CVHOSTTIME_H__)
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#define __COREVIDEO_CVHOSTTIME_H__ 1
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#include <TargetConditionals.h>
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#if TARGET_OS_MAC
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#include <QuartzCore/CVBase.h>
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#else
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#include <CVBase.h>
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#endif
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/*!
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@function CVGetCurrentHostTime
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@abstract Retrieve the current value of the host time base.
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@discussion On Mac OS X, the host time base for CoreVideo and CoreAudio are identical, and the values returned from either API
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may be used interchangeably.
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@result The current host time.
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*/
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extern uint64_t CVGetCurrentHostTime() AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
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/*!
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@function CVGetHostClockFrequency
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@abstract Retrieve the frequency of the host time base.
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@discussion On Mac OS X, the host time base for CoreVideo and CoreAudio are identical, and the values returned from either API
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may be used interchangeably.
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@result The current host frequency.
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*/
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extern double CVGetHostClockFrequency() AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
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/*!
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@function CVGetHostClockMinimumTimeDelta
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@abstract Retrieve the smallest possible increment in the host time base.
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@result The smallest valid increment in the host time base.
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*/
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extern uint32_t CVGetHostClockMinimumTimeDelta() AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
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#if defined(__cplusplus)
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}
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#endif
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#endif
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