Re: Problem with soundmodem on Eee PC

[Christof Bodner <christof.bodner@gmx.net>]

Hi,

Soundmodem stopped to work in Ubuntu 8.04, in 7.10 it works fine with
OSS. Today I tried it again with ALSA plughw: and it stopped after
receiving the first packet. That was reproduceable and occured in the
soundmodemconfig modem diagnostic as well as in the soundmodem itself.

grx,
Christof

Am Samstag, den 12.09.2009, 16:12 -0700 schrieb Dave Platt:
> > 2) Use the ALSA sound system instead of the OSS system, which I think is 
> > now standard on Ubuntu and most other 2.6 Linuxes. I had been sticking 
> > with OSS for a while because I found the commercial (paid) OSS system to 
> > be very stable on the old SuSE distro I was running. I now use Ubuntu 
> > and the ALSA system will re-sample whatever audio comes in from whatever 
> > soundcard to give the software what it asked for.
> 
> That's true, *if* you specify the "plughw:" ALSA device as the one
> to use.  This utilizes a library plugin which will perform sample-rate
> and sample-depth conversion on the fly, so that the application will
> get the rate it expects.
> 
> If you use the direct "hw:" device specification, the application
> is restricted to only those exact sample rates / widths / formats
> that the hardware supports.  If the app tries to request an unsupported
> configuration, the attempt to open the device will fail and the
> app won't get any audio in/out over the channel.
> 
> The current version of the soundmodem configurator has "plughw:"
> available in the menu of device choices for ALSA.  It also has
> some fixes to audio-channel management that are needed with some
> ALSA devices (e.g. some USB audio converters).  Older versions
> of the soundmodem app may not work well with some devices when
> using ALSA.
> 
> I have a feeling that some of the soundmodem utility code
> (e.g. the scope) may need some of the same "restart cleanly
> after an error" fixes that the main modem code required, in
> order to work properly with ALSA.
> 
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---------oOO--(_)--OOo-----------------------------------------------
 Christof Bodner <Christof.Bodner@gmx.net>
   Linux - Life is too short for reboots
         - First they ignore you. Then they laugh at you. Then they
           fight you(*). Then you win. -- Ghandi
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