[Alsa-user] selecting line-in (rather than MIC) via API

[Andrew C. <col...@gm...>]

hi,

i am writing a small code (based on the aplay.c source) to record data 
from my sound card. i cannot get away with simply using arecord since 
there are a few (unrelated) features that i need to build into this code 
(it is going to be used for logging VLF radio recordings). at present 
the stripped down version of the code works well: it records audio from 
the MIC jack. however the signal that comes in from our receiver is too 
big for the MIC (it requires no amplification), so i want to feed it 
into the LINE-IN jack. how do i go about telling ALSA to record from 
LINE-IN rather than MIC? i am aware that i can go and toggle this in the 
mixer. however, this software is ultimately going to run autonomously on 
an unattended machine, which will make the use of the mixer a little tricky!

best regards,
andrew.

-- 
Andrew B. Collier                 http://justtrottingalong.blogspot.com/

Physicist
Waves and Space Plasmas Group
Hermanus Magnetic Observatory

Honorary Senior Lecturer                             tel: +27 31 2601157
Space Physics Research Institute                     fax: +27 31 2607795
University of KwaZulu-Natal, Durban, South Africa    gsm: +27 83 3813655