Audio Unit PDC / latency troubles
Audio Unit PDC / latency troubles
- Subject: Audio Unit PDC / latency troubles
- From: Paul Tapper <email@hidden>
- Date: Fri, 14 Nov 2008 13:42:49 +0000
- Importance: Normal
Hi,
I have a couple of AudioUnit plug ins, which, in some modes of operation have quite high latencies. I am trying to use PDC, by calling:
PropertyChanged(kAudioUnitProperty_Latency,kAudioUnitScope_Global,0);
and then notifying the host of the latency using
GetLatency()
to return the amount of seconds the plug has as latency (in my test case this is = 0.278639 secs).
Now, I've tested that this PDC works correctly in the hosts I have (including Logic 8) on a Mac Mini, and on a Mac laptop, and in all cases it seems to be working correctly. However, a beta tester is reporting that on his Mac Pro, in Logic 8, the PDC isn't functioning correctly. If he plays two identical tracks simultaneously, one with the plug inserted on it, he hears the tracks out of sync, whereas, for me, this test plays the tracks in sync correctly.
I've given him a build which generates a log, which tells me that the plugin called PropertyChanged correctly, and returned the correct value from GetLatency, so I'm prtty much at a loss as to why it wouldn't work in his system, but be working in mine.
Please, could anyone make any suggestions as to what this problem could be down to?
Any help would be gratefully received.
Paul
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