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59 lines
1.7 KiB
59 lines
1.7 KiB
/* |
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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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