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/* Copyright © 2007 Apple Inc. All Rights Reserved.
Disclaimer: IMPORTANT: This Apple software is supplied to you by
Apple Inc. ("Apple") in consideration of your agreement to the
following terms, and your use, installation, modification or
redistribution of this Apple software constitutes acceptance of these
terms. If you do not agree with these terms, please do not use,
install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Inc.
may be used to endorse or promote products derived from the Apple
Software without specific prior written permission from Apple. Except
as expressly stated in this notice, no other rights or licenses, express
or implied, are granted by Apple herein, including but not limited to
any patent rights that may be infringed by your derivative works or by
other works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#if !defined(__CAHostTimeBase_h__)
#define __CAHostTimeBase_h__
//=============================================================================
// Includes
//=============================================================================
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
#include <CoreAudio/CoreAudioTypes.h>
#else
#include <CoreAudioTypes.h>
#endif
#if TARGET_OS_MAC
#include <mach/mach_time.h>
#elif TARGET_OS_WIN32
#include <windows.h>
#else
#error Unsupported operating system
#endif
#include "CADebugMacros.h"
//=============================================================================
// CAHostTimeBase
//
// This class provides platform independent access to the host's time base.
//=============================================================================
#if CoreAudio_Debug
// #define Log_Host_Time_Base_Parameters 1
// #define Track_Host_TimeBase 1
#endif
class CAHostTimeBase
{
public:
static UInt64 ConvertToNanos(UInt64 inHostTime);
static UInt64 ConvertFromNanos(UInt64 inNanos);
static UInt64 GetTheCurrentTime();
#if TARGET_OS_MAC
static UInt64 GetCurrentTime() { return GetTheCurrentTime(); }
#endif
static UInt64 GetCurrentTimeInNanos();
static Float64 GetFrequency() { if(!sIsInited) { Initialize(); } return sFrequency; }
static Float64 GetInverseFrequency() { if(!sIsInited) { Initialize(); } return sInverseFrequency; }
static UInt32 GetMinimumDelta() { if(!sIsInited) { Initialize(); } return sMinDelta; }
static UInt64 AbsoluteHostDeltaToNanos(UInt64 inStartTime, UInt64 inEndTime);
static SInt64 HostDeltaToNanos(UInt64 inStartTime, UInt64 inEndTime);
private:
static void Initialize();
static bool sIsInited;
static Float64 sFrequency;
static Float64 sInverseFrequency;
static UInt32 sMinDelta;
static UInt32 sToNanosNumerator;
static UInt32 sToNanosDenominator;
static UInt32 sFromNanosNumerator;
static UInt32 sFromNanosDenominator;
static bool sUseMicroseconds;
#if Track_Host_TimeBase
static UInt64 sLastTime;
#endif
};
inline UInt64 CAHostTimeBase::GetTheCurrentTime()
{
UInt64 theTime = 0;
#if TARGET_OS_MAC
theTime = mach_absolute_time();
#elif TARGET_OS_WIN32
LARGE_INTEGER theValue;
QueryPerformanceCounter(&theValue);
theTime = *((UInt64*)&theValue);
#endif
#if Track_Host_TimeBase
if(sLastTime != 0)
{
if(theTime <= sLastTime)
{
DebugMessageN2("CAHostTimeBase::GetTheCurrentTime: the current time is earlier than the last time, now: %qd, then: %qd", theTime, sLastTime);
}
sLastTime = theTime;
}
else
{
sLastTime = theTime;
}
#endif
return theTime;
}
inline UInt64 CAHostTimeBase::ConvertToNanos(UInt64 inHostTime)
{
if(!sIsInited)
{
Initialize();
}
Float64 theNumerator = static_cast<Float64>(sToNanosNumerator);
Float64 theDenominator = static_cast<Float64>(sToNanosDenominator);
Float64 theHostTime = static_cast<Float64>(inHostTime);
Float64 thePartialAnswer = theHostTime / theDenominator;
Float64 theFloatAnswer = thePartialAnswer * theNumerator;
UInt64 theAnswer = static_cast<UInt64>(theFloatAnswer);
//Assert(!((theNumerator > theDenominator) && (theAnswer < inHostTime)), "CAHostTimeBase::ConvertToNanos: The conversion wrapped");
//Assert(!((theDenominator > theNumerator) && (theAnswer > inHostTime)), "CAHostTimeBase::ConvertToNanos: The conversion wrapped");
return theAnswer;
}
inline UInt64 CAHostTimeBase::ConvertFromNanos(UInt64 inNanos)
{
if(!sIsInited)
{
Initialize();
}
Float64 theNumerator = static_cast<Float64>(sToNanosNumerator);
Float64 theDenominator = static_cast<Float64>(sToNanosDenominator);
Float64 theNanos = static_cast<Float64>(inNanos);
Float64 thePartialAnswer = theNanos / theNumerator;
Float64 theFloatAnswer = thePartialAnswer * theDenominator;
UInt64 theAnswer = static_cast<UInt64>(theFloatAnswer);
//Assert(!((theDenominator > theNumerator) && (theAnswer < inNanos)), "CAHostTimeBase::ConvertToNanos: The conversion wrapped");
//Assert(!((theNumerator > theDenominator) && (theAnswer > inNanos)), "CAHostTimeBase::ConvertToNanos: The conversion wrapped");
return theAnswer;
}
inline UInt64 CAHostTimeBase::GetCurrentTimeInNanos()
{
return ConvertToNanos(GetTheCurrentTime());
}
inline UInt64 CAHostTimeBase::AbsoluteHostDeltaToNanos(UInt64 inStartTime, UInt64 inEndTime)
{
UInt64 theAnswer;
if(inStartTime <= inEndTime)
{
theAnswer = inEndTime - inStartTime;
}
else
{
theAnswer = inStartTime - inEndTime;
}
return ConvertToNanos(theAnswer);
}
inline SInt64 CAHostTimeBase::HostDeltaToNanos(UInt64 inStartTime, UInt64 inEndTime)
{
SInt64 theAnswer;
SInt64 theSign = 1;
if(inStartTime <= inEndTime)
{
theAnswer = inEndTime - inStartTime;
}
else
{
theAnswer = inStartTime - inEndTime;
theSign = -1;
}
return theSign * ConvertToNanos(theAnswer);
}
#endif
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