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2026-08-07 17:29:36 +00:00 · 2020-04-22 12:56:21 -04:00
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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