[Protux-devel] some diplomacy...

[Luciano Giordana]

Hi all,

we need to make some diplomacy with ALSA developers. I tried a LOT to answer 
the questions below, but I just can't, even re-reading the ALSA docs (it just 
help nothing...)

I tried to send some emails to them  , but they didnt answer. I believe protux 
is a more mature project now, and maybe with good diplomacy, they will spend 
some time to answer the questions. We could offer to write a little 
documentation on how to use ALSA for multitrack applications (there is 
nothing about this over the internet...)


questions :

1 - I have 2 cards (card 0 and card1). both has the ability to record in 
stereo, only from right or only from left ( I checked this in a windows 
application). 

Is the following correct ? (if not, what would be correct , or what is the 
logic for the hwx,x string and the real card buses?)


card 0 , stereo capture bus : hw0,0
card 0, right capture bus : hw0,1
card 0, left cpature bus : hw0,2
card 1, stereo capture bus : hw1,0
and so on...


2 - I have a card with simple stereo playback and the ability to record from 
stereo, right or left channel, as the question 1 says.

I see that in /proc/asound/card0 I have these directories pcm0, pcm1, and so 
on.. 

my application must now if which pcmxx can record in stereo and which can 
record in mono (from right or left channel). Is there a relation between 
pcmxx dirs and  the card "channels"  ? if yes, what is relation? if not, how 
can I know all ways that my card can record , and how to acess only the 
right/left or stereo channels to record or even playback ?


Thanks

Luciano


--
Best Regards
--
Luciano Giordana - Musician - Certified Java/GNU C++ Developer - Free Software 
Evangelist
Project Mustux - http://www.freesoftware.fsf.org/mustux
-- Once Palladium is up and running , I will become a hacker --