Re: [ecasound] ecasound with alsa

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Subject: Re: [ecasound] ecasound with alsa
From: Kai Vehmanen (k@eca.cx)
Date: Sun Sep 23 2001 - 02:04:37 EEST

On Sat, 22 Sep 2001, CLOTILDE wrote:

> I downloaded alsa-driver-0.9.0beta7.tar.gz alsa-tools-0.9.0beta7.tar.gz
> alsa-lib-0.9.0beta7.tar.gz and alsa-utils-0.9.0beta7.tar.gz.
[...]
> But nothing with the word alsa in the output seems to work
> ( -o alsa,hw:1 -o alsa,default etc).

How did you install ecasound? If you have installed from rpms, make sure
you have installed the ecasound-plugins package. If you've compiled from
sources, "cd ecasound-x.y.z/libecasound/plugins ; make ; make
install"... or just recompile whole ecasound.

To check for ALSA-support, you can use the following trick:

--cut--
|$ echo aio-register | ecasound -c |grep alsa
Normal exit...
Clean exit...
32. ^alsa$, handled by "ALSA named PCM device". (params: label,pcm_name)
33. ^alsa_06$, handled by "ALSA named PCM device". (params: label,pcm_name)
34. ^alsahw$, handled by "ALSA PCM device". (params: label,card,device,subdevice)
35. ^alsahw_06$, handled by "ALSA PCM device". (params: label,card,device,subdevice)
36. ^alsaplugin$, handled by "ALSA PCM device". (params: label,card,device,subdevice)
37. ^alsaplugin_06$, handled by "ALSA PCM device". (params: label,card,device,subdevice)
--cut--

> On a second point, using /dev/dsp instead of alsa,something does it
> change the quality or the latency of the audio output?

Currently there aren't that many differences. Possible benefits of
native mode:
 - you avoid bugs in ALSA's OSS-emulation (if any).. similarly
   by using the emulation layer you avoid bugs in alsa-lib ;)
 - you can use audio formats not supported by OSS (more exotic
   combinations of sample width, channel count, srate and
   channel layout)
 - advanced ALSA features like the plugin layer and the asoundrc
   system

But nothing critical at the moment. This will probably change after
stable ALSA versions are released and more developers (and not just
the ALSA team) start to write apps and plugins for ALSA. 

-- 
 http://www.eca.cx
 Audio software for Linux!

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