There's also GStreamer which would allow you to build a custom audio
pipeline. Something like:
alsasrc -> deinterleave (to multiple mono's) -> interleave (mono pairs
to stereo) -> encodebin/standalone encoders/muxers -> multifilesink
(splits output into multiple sequential files).
This is the basic pipeline (I left out queue's you'd need for
multithreading etc.), but it should be a pretty decent way of doing
what you're asking.
Alex.
On Thu, 2 May, 2013 at 6:52 PM, Bill Unruh <un...@physics.ubc.ca> wrote:
On Thu, 2 May 2013, Vincent Gulinao wrote:
Hi everyone,
I have a task to setup a system that will continuously capture
multiple
stereo signals using a MADI audio card (RME HDSPe MADI) and write
them into
files (perhaps in 1 hour chunks). Few checks I've learned while
googling on
the topic looks like that my linux setup seem to recognize the card
at
least.
"Multiple Stereo signals" means what? I have no idea about the MADi
interface
or how alsa supports it. But if it does, it may be as simple as
arecord -Dhw:0 -c 18 -r 48000 -f SB24_LE output.wav
which would keep recording forever into output.wav.
You could also use the -d 3600 to tell it to record for exactly an
hour. You
would then have to have a script to restart it to a different output
file, but
would miss a bit of the stream because of the time to stop and
restart.
I vaguely recall a recording program that will automatically dump
into a new
file every x secods, presumably not missing anything, but cannot
remember it
now.
(Note the above tells arecord to use the hardware input, not put it
through a
filter like rate changing etc, tells it you want 18 channels, a rate
of 48000
samples per sec on each channel, and the input is in 24 bit format
with Low
Order byte order.
I'm a total noob in ALSA and audio concepts in general. I've read
many docs
If you told us what you were trying to do, someone could probably
offer better
advice.
Note that the above assumes that you alsa does support the card
without
problems and the card is card 0 on your system.
and forums (e.g. arecord, asoundrc, pulseaudio, jack, etc.) here
and there.
But while I wait all those info settle in my mind, can somebody
pitch here
some high-level hints on what things I need to know, or what sort of
questions should I be asking, to accomplish this task and make sure
I'm on
the right direction?
Thanks in advance!
--
William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273
Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324
UBC, Vancouver,BC | Program in Cosmology | un...@physics.ubc.ca
Canada V6T 1Z1 | and Gravity |
www.theory.physics.ubc.ca/
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