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How to set the vaule of AudioTimeStamp structure

Hi, all,

I am going to set the buffer size of input/output audio device using AudioDeviceSetProperty(), and want the setting to be effective immediately. But I have no idea on how to set the parameter AudioTimeStamp. Be more straight, what is the meaning of the field in AudioTimeStamp structure and how to set it?

struct AudioTimeStamp
{
Float64 mSampleTime; // the absolute sample time
UInt64 mHostTime; // the host's root timebase's time
Float64 mRateScalar; // the system rate scalar
UInt64 mWordClockTime; // the word clock time
SMPTETime mSMPTETime; // the SMPTE time
UInt32 mFlags; // the flags indicate which fields are valid
UInt32 mReserved; // reserved, pads the structure out to force 8 byte alignment
};

I still cannot understand the meaning although there are some comments above.

Can anyone give a pointer?

Thanks,

kaiduan

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