Subject: Re: [linux-audio-user] emu10k1 and jack
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Wed Feb 04 2004 - 21:29:33 EET
On Wed, Feb 04, 2004 at 08:16:20 +0100, Antonio wrote:
>
> Steve Harris wrote:
> [cut]
> # Thats because the processing in jamin is high latency - jack itsself
> # doesnt add any latency, no matter how many apps you connect.
> #
> # Well, actually thats not true - it will add latency if you have a jack
> # feedback loop, but only 1 buffers worth. With trees and chains you dont
> # get any additional lantecy over what the app adds.
>
> So if I understand, we have the alsa input latency plus the latency of
> each app that elaborate the audio stream, while jack doesnt introduce
> any latency (unless there is a loop).
Yes.
> Is there also an additional latency for the alsa out?
> If not, playng via midi, I have only the soft-synth related latency (it
> seems strange to me)?
Yes, there is both a delay in alsa copying data to the card (up to 2x
buffer size, IIUC), and in the card doing its DA conversion. The DA
conversion will take something like 2ms.
- Steve
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