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AudioGetCurrentHostTime

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AudioGetCurrentHostTime

Subject: AudioGetCurrentHostTime
From: IainS <email@hidden>
Date: Tue, 3 Feb 2009 11:58:30 +0000

Hello,

(this discussion concerns 10.4.11 [intel and ppc] --- a client constraint, so "change to 10.5" is not a useful option).

I want to reference timestamped data between a non-audio app and an audio app.

The AudioGetCurrentHostTime/AudioConvertHostTimeToNanos interface seems like it should do the trick... (my simplistic expectation was that *host* time would be independent of presence/absence of a running audio interface).

However, when I call it from an application with no audio context - the value returned by AudioGetCurrentHostTime doesn't change.

If I call mach_absolute_time() in the same position - this works fine.

So:

1/ Is this expected behavior (i.e. "Audio" host time doesn't change unless there's an established audio interface in the app)?

2/ Is AudioGetCurrentHostTime == mach_absolute_time() ?

3/ Is there any reason that I might expect a problem calling these interfaces on multiple threads?

(I have not seen any difficulty when using these interfaces in audio contexts).

thanks,
Iain
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