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iphone - CoreAudio AudioTimeStamp.mHostTime clock ...
https://stackoverflow.com/questions/675626/coreaudio-audiotimestamp-mhosttime-clock-frequency
When I'm running my application in the simulator the AudioTimeStamp.mHostTime appears to be in nanoseconds (1,000,000,000th of a second) whereas when running on my device (iPod Touch 2G) the frequency appears to be about 6,000,000th of a second. It appears that on OS X there is a function (AudioConvertHostTimeToNanos in CoreAudio/CoreAudioTypes.h) to convert …
Technical Q&A QA1643: Audio Host Time On iOS - Apple …
https://developer.apple.com/library/archive/qa/qa1643/_index.html
A: While the best way to work with host time on iOS is using the CAHostTimeBase helper class, iOS developers may simply call mach_absolute_time to retrieve the current host time. Listing 1 Getting the current host time. UInt64 theTime = mach_absolute_time (); The other important component of the host time is the frequency or timebase.
objective c - iOS Accurate AudioTimeStamp when …
https://stackoverflow.com/questions/15072350/ios-accurate-audiotimestamp-when-rendering-audio-units
The minimum length of an iOS Audio Unit buffer seems to be around 6 mS. So if you use the time-stamps of the buffer callbacks, your time resolution or time sampling jitter will be about +- 6 mS. If you look at the actual raw PCM samples inside the Audio Unit buffer and pattern match the "attack" transient (by threshold or autocorrelation, etc.) you might be able get …
Apple Developer Documentation
https://developer.apple.com/documentation/coreaudiotypes/audiotimestamp
The host machine's time base (see CoreAudio/HostTime.h ). var mRateScalar: Float64. The ratio of actual host ticks per sample frame to the nominal host ticks per sample frame. var mReserved: UInt32. Pads the structure out to force an even 8-byte alignment. var mSMPTETime: SMPTETime. The SMPTE time (see SMPTETime ). var mSampleTime: Float64.
CoreAudio AudioTimeStamp.mHostTime clock frequency?
https://www.py4u.net/discuss/1594789
I'm running into a bit of a problem with AudioTimeStamps on the iPhone. When I'm running my application in the simulator the AudioTimeStamp.mHostTime appears to be in nanoseconds (1,000,000,000th of a second) whereas when running on my device (iPod Touch 2G) the frequency appears to be about 6,000,000th of a second.
AudioTimeStamp Struct (AudioToolbox) | Microsoft Docs
https://docs.microsoft.com/en-us/dotnet/api/audiotoolbox.audiotimestamp
Represents an audio time stamp in various formats. In this article Definition Remarks Fields Methods Applies to C# public struct AudioTimeStamp Inheritance ValueType AudioTimeStamp Remarks The Flags property specifies which fields are valid. Fields Fields Flags Flags used to interpret the data in this AudioTimeStamp. Host Time Rate Scalar Reserved
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