08.02.2015 17:35, Georg Chini wrote:
I think there is some misunderstanding. Let me repeat in a different
way.
The smoother works perfectly (both for timer-based scheduling and for
the needs of your module) on non-batch cards.
But, even for batch cards, where timer-based scheduling is disabled,
the smoother is active and is actually used for reporting the latency
to your module. An attempt to use the smoother for timer-based
scheduling on batch cards has failed. That's why I suspect that it,
on batch cards, also tells lies to your module.
OK, understood. I don't have anything to test it though
Mh, are my USB devices batch cards? I just noticed it says "Disabling
timer scheduling
because BATCH flag is set" in the log and I am not sure, what a batch
card is.
Yes, your USB devices are batch cards. This means that they don't report
their playback position accurately enough. For USB devices, the
granularity of position reports is 6 ms (for large period sizes), but
for others, it may be up to one period size.
--
Alexander E. Patrakov
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