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livetrax/libs/appleutility/CoreAudio/PublicUtility/CAHostTimeBase.h

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/*
File: CAHostTimeBase.h
Abstract: Part of CoreAudio Utility Classes
Version: 1.1
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*/
#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>
#include <pthread.h>
#elif TARGET_OS_WIN32
#include <windows.h>
#include "WinPThreadDefs.h"
#else
#error Unsupported operating system
#endif
#include "CADebugPrintf.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() { pthread_once(&sIsInited, Initialize); return sFrequency; }
static Float64 GetInverseFrequency() { pthread_once(&sIsInited, Initialize); return sInverseFrequency; }
static UInt32 GetMinimumDelta() { pthread_once(&sIsInited, Initialize); return sMinDelta; }
static UInt64 AbsoluteHostDeltaToNanos(UInt64 inStartTime, UInt64 inEndTime);
static SInt64 HostDeltaToNanos(UInt64 inStartTime, UInt64 inEndTime);
static UInt64 MultiplyByRatio(UInt64 inMuliplicand, UInt32 inNumerator, UInt32 inDenominator);
private:
static void Initialize();
static pthread_once_t sIsInited;
static Float64 sFrequency;
static Float64 sInverseFrequency;
static UInt32 sMinDelta;
static UInt32 sToNanosNumerator;
static UInt32 sToNanosDenominator;
#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)
{
DebugPrintf("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)
{
pthread_once(&sIsInited, Initialize);
UInt64 theAnswer = MultiplyByRatio(inHostTime, sToNanosNumerator, sToNanosDenominator);
#if CoreAudio_Debug
if(((sToNanosNumerator > sToNanosDenominator) && (theAnswer < inHostTime)) || ((sToNanosDenominator > sToNanosNumerator) && (theAnswer > inHostTime)))
{
DebugPrintf("CAHostTimeBase::ConvertToNanos: The conversion wrapped");
}
#endif
return theAnswer;
}
inline UInt64 CAHostTimeBase::ConvertFromNanos(UInt64 inNanos)
{
pthread_once(&sIsInited, Initialize);
UInt64 theAnswer = MultiplyByRatio(inNanos, sToNanosDenominator, sToNanosNumerator);
#if CoreAudio_Debug
if(((sToNanosDenominator > sToNanosNumerator) && (theAnswer < inNanos)) || ((sToNanosNumerator > sToNanosDenominator) && (theAnswer > inNanos)))
{
DebugPrintf("CAHostTimeBase::ConvertFromNanos: The conversion wrapped");
}
#endif
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 = static_cast<SInt64>(inEndTime - inStartTime);
}
else
{
theAnswer = static_cast<SInt64>(inStartTime - inEndTime);
theSign = -1;
}
return theSign * static_cast<SInt64>(ConvertToNanos(static_cast<UInt64>(theAnswer)));
}
inline UInt64 CAHostTimeBase::MultiplyByRatio(UInt64 inMuliplicand, UInt32 inNumerator, UInt32 inDenominator)
{
#if TARGET_OS_MAC && TARGET_RT_64_BIT
__uint128_t theAnswer = inMuliplicand;
#else
long double theAnswer = inMuliplicand;
#endif
if(inNumerator != inDenominator)
{
theAnswer *= inNumerator;
theAnswer /= inDenominator;
}
return static_cast<UInt64>(theAnswer);
}
#endif