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Re: [Linphone-users] Alsa makes no noise

From: Marcel Karras
Subject: Re: [Linphone-users] Alsa makes no noise
Date: Wed, 14 Sep 2005 19:02:50 +0200


On Wed, 14 Sep 2005 14:07:01 +0200
Simon Morlat <address@hidden> wrote:
> No linphone doesn't work with stereo, as usually microphones are mono only.
> Does the  arecord -f S16_LE -r 8000 |aplay -f S16_LE -r 8000 
> also works with mono ?

Yes, it will. But any other frequency greater than 8000 Hz will produce xruns.
8000 Hz works perfect for simultaneous recording and playing.

> Could you try with another soundcard ? I still think it's a problem with this 
> alsa driver.

I regret, no. The DSP is a UCB1400 AC97 controller directly implemented
into the embedded device. We got this board from a special distributor.
(Emlix NetDCU6 - see at
I'm also in contact with the developers at Emlix in order to solve the
problem but they pointed me to the linphone developers. (as the Alsa
people did before) You might be right that there's a driver problem but
I'm not that familiar with the topic in order to find the problem inside
the driver code.

- Marcel Karras

Contact: address@hidden   address@hidden 
Unix, Linux && OpenSource   Student of Chemnitz University of Technology

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