[pulseaudio-tickets] [Bug 75470] New: CoreAudio Device latency configuration

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75470

          Priority: medium
            Bug ID: 75470
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: CoreAudio Device latency configuration
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Mac OS X (All)
          Reporter: poldsberg at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: modules
           Product: PulseAudio

I have been looking into the high latency when using PulseAudio as input and
output on OS X with CoreAudio.
It seems like the default fixed latency of 250ms is used, which ends up being a
total latency of 500ms. I tried lowering the latency using PULSE_LATENCY_MSEC
but this seems to have no effect. It is however possible to increase the
latency using this method.
I noticed that setting the PA_SINK_DYNAMIC_LATENCY and
PA_SOURCE_DYNAMIC_LATENCY flags in module-coreaudio-device.c will reduce the
latency to about 10ms. Perhaps there should be a way to enable dynamic latency,
as this seems to reduce the latency by a significant amount.
Or perhaps there is a reason to not use dynamic latency that I am unaware of?

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