Re: Jack, sun and envy problem

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Jack, sun and envy problem
\ Jean-michel Bessot (4 May 2008)
. \ Girish Venkatachalam (4 May 2008)
. . \ Jacob Meuser (4 May 2008)
. \ Tom Rosso (4 May 2008)
. . \ Jean-michel Bessot (4 May 2008)
. . \ Jacob Meuser (4 May 2008)
. . . \ Tom Rosso (4 May 2008)
. . . . \ Jacob Meuser (4 May 2008)
. \ Jacob Meuser (4 May 2008)
. . \ Jean-michel Bessot (4 May 2008)
. . . \ Jacob Meuser (4 May 2008)

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Subject:	Re: Jack, sun and envy problem
Group:	Openbsd-misc
From:	Jacob Meuser
Date:	4 May 2008

On Sun, May 04, 2008 at 08:09:17PM +0200, Jean-michel Bessot wrote:
> It works with the version in ports and the -i 0 option, not -i 12 .

ah, I forgot about audio(4) buffers being limited to 65536 bytes.

12 channels * 4 bytes per sample = 48 bytes per frame. jackd uses
2 buffers of 1024 frames each by default, so you need 2048 frames of
buffer space, which is 98304 bytes, which won't work. instead, tell
jackd to use 512 frame buffers (2 * 512 * 48 = 49152):

$ jackd -d sun -o 10 -i 12 -w 32 -p 512

there is still an inefficiency with duplex mode in the current port
though. I'm waiting for upstream to make a decision about another
patch before I update the port.

> Thx for your help .
>
> --
> Jean-michel Bessot <jmbessot>
>

--
jakemsr
SDF Public Access UNIX System - http://sdf.lonestar.org