[pulseaudio-discuss] avoid increase watermark for low latency capture

[xing wang]

Hi all,

When meet Overrun or Underrun, PA will increase watermark. Due to some
hardware limitation, the hw_ptr will not be updated in PA's request latency.
So there maybe some cases "faked overrun/underrun". Take capture for
example, when Pulseaudio was waken up to read new capture data from driver,
and find the "available" area is much more than the record space. Although
it's fast enough to read out all data in short time, PA regard that as
"overrun" and increase watermark/latency step by step, that's really
useless.

So attached patch used to avoid such case and only increase
watermark/latency in real "overrun" case.

--xingchao
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