Re: [LAU] audio latency question

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To: andy baxter <andy@...>
Cc: <linux-audio-user@...>
Date: Wednesday, March 23, 2011 - 12:43 pm

1) it depends on the synth

2) with JACK MIDI, there is zero latency and zero jitter between two
applications. with ALSA MIDI, latency can be up to a few msecs, but is
generally on the order of tens of usecs. with ALSA, you don't have
deterministic scheduling of the apps (in general) and that is the main
source of the latency and jitter. in addition, the MIDI data arrives
(via ALSA) in the wrong thread, so there is some delay involved in
getting it injected into the synthesis (process()) thread without
locks. with JACK, the MIDI data arrives in the right thread, with
sample accurate timestamps.

On 3/23/11, andy baxter wrote:

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Messages in current thread:
[LAU] audio latency question, andy baxter, (Sun Mar 20, 5:26 pm)
Re: [LAU] audio latency question, andy baxter, (Wed Mar 23, 7:06 am)
Re: [LAU] audio latency question, Paul Davis, (Wed Mar 23, 12:43 pm)
Re: [LAU] audio latency question, andy baxter, (Wed Mar 23, 3:43 pm)
Re: [LAU] audio latency question, Jörn Nettingsmeier, (Sun Mar 20, 6:38 pm)
Re: [LAU] audio latency question, S. Massy, (Sun Mar 20, 10:49 pm)
Re: [LAU] audio latency question, andy baxter, (Sun Mar 20, 8:26 pm)
Re: [LAU] audio latency question, andy baxter, (Sun Mar 20, 6:56 pm)
Re: [LAU] audio latency question, Gabriel M. Beddingfield, (Sun Mar 20, 6:52 pm)
Re: [LAU] audio latency question, Paul Davis, (Sun Mar 20, 5:55 pm)
Re: [LAU] audio latency question, andy baxter, (Sun Mar 20, 6:52 pm)
Re: [LAU] audio latency question, Folderol, (Sun Mar 20, 7:11 pm)
Re: [LAU] audio latency question, Folderol, (Sun Mar 20, 7:33 pm)
Re: [LAU] audio latency question, andy baxter, (Sun Mar 20, 7:47 pm)
Re: [LAU] audio latency question, andy baxter, (Sun Mar 20, 8:04 pm)
Re: [LAU] audio latency question, Gabriel M. Beddingfield, (Sun Mar 20, 5:42 pm)