asterisk users - Jan 2005 - echo test application delay using the asterisk cli

I'm trying to figure out why I get delay using the echo test
application. I'm using the asterisk cli so I got no external factors
that could interfere. I'm getting close to half a second delay
speaking into the microphone and hearing it out through my speakers.

I'm doing lots of audio work (sequencing and recording) so asterisk is
definitely the problem. Of course, only thing running is asterisk and
nothing special is using the cpu or any subsystems of the kernel, in
case you ask.

I'm using GNU/linux-2.6.10 on a p3-600 with emu10k1 spu (creative
soundblaster live), now using asterisk cvs from only a week old. I've
tried the distributions and many many cvs checkouts, but I'm getting
no further. The source for app_echo.c is only 30 lines long and does
nothing except writing out what it reads in. Mark Spencer, I'm
lost. Where does the latency stem from?.

Asking this on the asterisk irc channel gets me nowhere. I've tried
many many times formulating it different ways, but few seems to
understand I'm only using the interactive shell mode of asterisk
dialing the echo application on the same server.

-- 
Esben Stien is b0ef@esben-stien.name
http://www.esben-stien.name
irc://irc.esben-stien.name/%23contact
[sip|iax]:b0ef@esben-stien.name

Esben Stien wrote:
>I'm trying to figure out why I get delay using the echo test
>application. I'm using the asterisk cli so I got no external factors
>that could interfere. I'm getting close to half a second delay
>speaking into the microphone and hearing it out through my speakers.
>
>I'm doing lots of audio work (sequencing and recording) so asterisk is
>definitely the problem. Of course, only thing running is asterisk and
>nothing special is using the cpu or any subsystems of the kernel, in
>case you ask.
>
>I'm using GNU/linux-2.6.10 on a p3-600 with emu10k1 spu (creative
>soundblaster live), now using asterisk cvs from only a week old. I've
>tried the distributions and many many cvs checkouts, but I'm getting
>no further. The source for app_echo.c is only 30 lines long and does
>nothing except writing out what it reads in. Mark Spencer, I'm
>lost. Where does the latency stem from?.
>
>Asking this on the asterisk irc channel gets me nowhere. I've tried
>many many times formulating it different ways, but few seems to
>understand I'm only using the interactive shell mode of asterisk
>dialing the echo application on the same server.
>  
>
There's probably lots of places where buffering is happening, but I'd 
look into chan_oss (if that's what you're using, you don't say), and
how
it uses your soundcard.

-SteveK