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Diffstat (limited to 'libs/appleutility/CoreAudio/PublicUtility/CAHostTimeBase.cpp')
| -rw-r--r-- | libs/appleutility/CoreAudio/PublicUtility/CAHostTimeBase.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/libs/appleutility/CoreAudio/PublicUtility/CAHostTimeBase.cpp b/libs/appleutility/CoreAudio/PublicUtility/CAHostTimeBase.cpp new file mode 100644 index 0000000000..db78a4afee --- /dev/null +++ b/libs/appleutility/CoreAudio/PublicUtility/CAHostTimeBase.cpp @@ -0,0 +1,99 @@ +/* + File: CAHostTimeBase.cpp + Abstract: CAHostTimeBase.h + Version: 1.1 + + 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. + + Copyright (C) 2014 Apple Inc. All Rights Reserved. + +*/ +//============================================================================= +// Includes +//============================================================================= + +#include "CAHostTimeBase.h" + +Float64 CAHostTimeBase::sFrequency = 0; +Float64 CAHostTimeBase::sInverseFrequency = 0; +UInt32 CAHostTimeBase::sMinDelta = 0; +UInt32 CAHostTimeBase::sToNanosNumerator = 0; +UInt32 CAHostTimeBase::sToNanosDenominator = 0; +pthread_once_t CAHostTimeBase::sIsInited = PTHREAD_ONCE_INIT; +#if Track_Host_TimeBase +UInt64 CAHostTimeBase::sLastTime = 0; +#endif + +//============================================================================= +// CAHostTimeBase +// +// This class provides platform independent access to the host's time base. +//============================================================================= + +void CAHostTimeBase::Initialize() +{ + // get the info about Absolute time + #if TARGET_OS_MAC + struct mach_timebase_info theTimeBaseInfo; + mach_timebase_info(&theTimeBaseInfo); + sMinDelta = 1; + sToNanosNumerator = theTimeBaseInfo.numer; + sToNanosDenominator = theTimeBaseInfo.denom; + + // the frequency of that clock is: (sToNanosDenominator / sToNanosNumerator) * 10^9 + sFrequency = static_cast<Float64>(sToNanosDenominator) / static_cast<Float64>(sToNanosNumerator); + sFrequency *= 1000000000.0; + #elif TARGET_OS_WIN32 + LARGE_INTEGER theFrequency; + QueryPerformanceFrequency(&theFrequency); + sMinDelta = 1; + sToNanosNumerator = 1000000000ULL; + sToNanosDenominator = *((UInt64*)&theFrequency); + sFrequency = static_cast<Float64>(*((UInt64*)&theFrequency)); + #endif + sInverseFrequency = 1.0 / sFrequency; + + #if Log_Host_Time_Base_Parameters + DebugPrintf("Host Time Base Parameters"); + DebugPrintf(" Minimum Delta: %lu", (unsigned long)sMinDelta); + DebugPrintf(" Frequency: %f", sFrequency); + DebugPrintf(" To Nanos Numerator: %lu", (unsigned long)sToNanosNumerator); + DebugPrintf(" To Nanos Denominator: %lu", (unsigned long)sToNanosDenominator); + #endif +} |