From mboxrd@z Thu Jan  1 00:00:00 1970
From: Clemens Ladisch <clemens@ladisch.de>
Subject: Re: [Vorbis-dev] libao problem (Re: No dmix/dsnoop on
 Intel ICH4/5 by default?)
Date: Sun, 24 Mar 2013 19:50:52 +0100
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To: xiphmont@xiph.org
Cc: alsa-devel@alsa-project.org, vorbis-dev@xiph.org, Rene Herman <rene.herman@gmail.com>
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xiphmont@xiph.org wrote:
>> The only thing I personally had an actual issue with is using "front" for
>> stereo rather than "default". I don't seem able to come up with a compelling
>> reason why it should be "front" myself, so one tweak could perhaps be to
>> only change the stereo device back to "default"?
>
> Because then you can't guarantee or even discover what the playback
> rate and bitdepth are. There's no way to ensure bit-exact playback in
> a plug device, where 'front' is usually a non-plug alias.

The SND_PCM_NO_AUTO_* flags are there for exactly this reason:
http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m.html#ga64fa40b556374dabe40d4874242fee19


Regards,
Clemens