[Bug 745078] osxaudio: AudioUnitGetProperty (..., kAudioUnitProperty_Latency, ...) takes time

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745078

--- Comment #3 from Arun Raghavan <arun at accosted.net> ---
For iOS, it might be sensible to use inputLatency and outputLatency from the
AVAudioSession.

https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVAudioSession_ClassReference/index.html#//apple_ref/occ/instp/AVAudioSession/

For the HAL, I'm not sure what the right thing to do is. I do see a IO buffer
size, as well as input and ouput latencies specified in the information page in
HAL Lab. If we can't query actual fill levels but can use these, it might
suffice for our purposes.

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