[Gta04-owner] Low latency audio routing

Jonas Smedegaard dr at jones.dk
Thu Jan 19 22:05:59 CET 2012

On 12-01-19 at 09:39pm, Radek Polak wrote:
> I think i made some progress. Here are my current scripts:
> arecord -B 4 -fS16_LE | aplay -B 4 -Dhw:1,0 &
> arecord -Dhw:1,0 -B 4 -fS16_LE | aplay -B 150000 &
> Basically i am trying to get the buffers as small as possible with the 
> -B parameter.


> There is one thing i am still not understanding. If you try to use 
> small buffer in the second command (e.g. 100000 instead of 150000), 
> you will get underruns but with 150000 you don't get them. To me it 
> looks like the soundcard does not like small buffers, but we need them 
> for low latencies. Any ideas?

Perhaps try experiment with --buffer-size option instead of 
--buffer-time (a.k.a. -B) for aplay.  Both because that might be more 
exact, and because - judging from its manpage - there may be some 
internal fallback defaults when arguments are outside of acceptable 
range, so you may not be testing your actual values.

...but I am just guessing here - not experienced in this field.

 - Jonas

 * Jonas Smedegaard - idealist & Internet-arkitekt
 * Tlf.: +45 40843136  Website: http://dr.jones.dk/

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