Subject: Re: [linux-audio-dev] question re: hammerfall cards
From: Thomas Vander Stichele (thomas_AT_urgent.rug.ac.be)
Date: Tue Mar 04 2003 - 13:06:26 EET
Hi Paul,
thanks for the quick answers, I tried things as soon as I got back.
I've been experimenting some more (sometimes analogue audio is so much
easier to debug), and I'm slowly learning stuff, but I haven't been able
to actually record things yet.
So, on to some more questions ...
> there are a couple of ways. alsactl is probably the most obvious:
>
> % alsactl -f foo store
> ... edit "foo" ...
> % alsactl -f foo restore
That seems to work as you says it does (apart from the fact that I can't
verify it actually works yet :)). I haven't seen this in any of the ALSA
docs I read through (granted, most of those were updated and seemed to be
pre-0.9, so I can't even tell how relevant some of those docs are) - did I
miss some more important document, or a most recent version of it ? Or did
I just miss it in my eagerness ?
After connecting S/PDIF input to the two cards, I wanted to try and record
stuff to see if I actually got the signal in.
I'm using arecord with various options.
arecord -l gives me
[root_AT_framboos tmp]# arecord -l
card 0: 15 [RME Digi9636 (Rev 1.5)], device 0: RME Digi9636 (Rev 1.5) [RME
Digi9636 (Rev 1.5)]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: 15_1 [RME Digi9636 (Rev 1.5)], device 0: RME Digi9636 (Rev 1.5)
[RME Digi9636 (Rev 1.5)]
Subdevices: 1/1
Subdevice #0: subdevice #0
arecord -L gives me a whole lot of output to stderr which I can't fully
understand at this point.
-d should allow me to specify a device, but I have no idea in what syntax
this is for which card. I tried a few things:
- specifying 0 and 1
- specifying 15 and 15_1, the card ids
- specifying "spdif" (based on output of arecord -L, but I don't know how
I would choose between cards in that case)
- specifying random numbers, which seems to do something even though I
can't imagine what it would be recording from in those cases.
In some cases it terminates after a second, which probably means I
specified an invalid device, but I don't get errors.
I have run with -v as well, but that seems to give information about
internal (software) plugins to do the recording.
All of the files I recorded I encoded with oggenc as a quick hack - if the
bitrate is 0.8 kb/sec, I'm pretty safe in assuming that I recorded silence
:)
So basically, my questions are :
a) is there some alsa-enabled recorder that allows me to choose devices
easily and allows for monitoring the incoming signal ?
b) what is the correct way (or a doc describing it) to specify devices for
arecord ? Is arecord using the "ALSA-standard" way of doing this, as is
done in other applications ?
c) could I have forgotten anything else here when trying to record stuff ?
I assume that, since the Hammerfall doesn't have a mixer chip, the channel
is always-on.
If there isn't any Hammerfall quick how-to, I wouldn't mind writing my
experiences down if that could be helpful for anyone.
Thanks in advance,
Thomas
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