Subject: Re: [linux-audio-user] USB-Audio latency
From: Frank Barknecht (fbar_AT_footils.org)
Date: Wed Jul 28 2004 - 18:07:55 EEST
Hi,
Polashek, Matthew wrote:
> Anyone here know:
>
> 1 - How I can measure the latency of a USB-audio device connected to PD via
> ALSA?
There is a patch in "doc/7.stuff/tools/" called latency.pd, which you
can use to measure roundtrip latencies with Pd. It comes with
instructions on use. Pd is *not* callback driven and uses various
buffers, so you will always get double or even triple latency in
Pd compared to something like Ardour.
> 2 - What the minimum latency of a USB-audio device is with Linux?
In my experiences with about 20 USB devices "jackstart -p 128" is the
lowest I ever could achieve more or less stable. How low a latency in
msecs that is depends on the samplerate.
Ciao
-- Frank Barknecht
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