Re (3): names for sound devices

[peasthope@shaw.ca]

*	From: <noelamac@gmail.com>
*	Date: Mon, 3 Sep 2012 18:02:14 +0000 (UTC)
> http://alsa.opensrc.org/FAQ026

Studied that and set the default device accordingly before 
my original query.  FAQ026 can be summarized thus.

if you want to assign names to devices such that the names 
    can change arbitrarily with a reboot or replugging of a device, 
then do as described prior to "Note by mschiff";
else (* you want the names to persist across a reboot or a replug *) 
    do as described following "Note by mschiff".

So according to mschiff, a default device is identified 
unambiguously in this system.  Here is a test.

peter@dalton:~$ speaker-test -D default

speaker-test 1.0.23

Playback device is default
Stream parameters are 48000Hz, S16_LE, 1 channels
Using 16 octaves of pink noise
Channels count (1) not available for playbacks: Invalid argument
Setting of hwparams failed: Invalid argument
peter@dalton:~$

"speaker-test -c 2" produces the noise described in the manual.  
"speaker-test -c 0" and "speaker-test -c 1" produce error messages 
similare to that above.  

Any ideas about why channels 0 and 1 are not available?  Any ideas 
about how a channel is related to a device?  What good is a default 
device which lacks a channel?
 
Incidentally, to my understanding, everything up to "Note by mschiff" 
in FAQ026 is obsolete and misleading.  I am inclined to delete it so 
that the instructions from mschiff take precedence.  Any objections?

Thanks,           ... Peter E.




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