vxpocket v2 full duplex latency with ALSA driver?

vxpocket v2 full duplex latency with ALSA driver?

[jfm3]

The ALi M5451 sound card in my laptop blows chunks in full duplex. I
have a question for vxpocket v2 + ALSA users.

Reports are that the windows driver for the vxpocket v2 yeilds high
latency when used full duplex. Is there a similar problem with the ALSA
driver? Is it really a driver problem or is it a hardware problem? What
kind of card latency is there?

-- 
(jfm3  2838 BCBA 93BA 3058 ED95  A42C 37DB 66D1 B43C 9FD0)



-------------------------------------------------------
This SF.net email is sponsored by: Etnus, makers of TotalView, The debugger 
for complex code. Debugging C/C++ programs can leave you feeling lost and 
disoriented. TotalView can help you find your way. Available on major UNIX 
and Linux platforms. Try it free. www.etnus.com

Re: vxpocket v2 full duplex latency with ALSA driver?

[Takashi Iwai]

At 07 Mar 2003 15:43:55 -0500,
jfm3 wrote:
> 
> The ALi M5451 sound card in my laptop blows chunks in full duplex. I
> have a question for vxpocket v2 + ALSA users.
> 
> Reports are that the windows driver for the vxpocket v2 yeilds high
> latency when used full duplex. Is there a similar problem with the ALSA
> driver? Is it really a driver problem or is it a hardware problem? What
> kind of card latency is there?

the ALSA uses the smallest IBL size (i.e. the capture latency) as
default.  this is the limitation for the single capture mode.
in the case of full-duplex, you'll get as enough fine resolution of
interrupts as the playback setting because the playback interrupt is
also used to update the capture stream, too.  so, in theory, you
should have no problem :)


ciao,

Takashi


-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Welcome to geek heaven.
http://thinkgeek.com/sf