Hi,
I have 5-6 DOS (386/486) machines to replace with one or more
linux machines to record audio [radio stations via analogue mic/line-in].
Currently one DOS machine records two stations (left/right channels),
one hour into a ~33MB(!) file, with ADPCM compression using
Creative SB card [with CSP chip] and it's "record" utility.
I was able to set up asound with my sound card after some struggle,
(C-Media 8738) but it currently creates 120MB files per hour, even
with rate 11025.
I know I could "postprocess" the files with sox or alike, but if it is
not a big problem, I'd like to do it "on the fly". I saw that there is an
"adpcm" option, but I wasn't able to get use of it. I would be glad
if someone could help me out here - or recommend other similarly
good solution.
For extra fun, it would be good if I could record from the left/right
channels separately (eg. two mono streams form the stereo input),
I don't know if it is possible, I also couldn't make a config for it.
My current/working .asoundrc as follows
pcm.card_0-hw {
type hw
card 0
device 0
rate 11025
}
pcm.card_0 {
type dsnoop
ipc_key 9000
slave.pcm "card_0-hw"
}
For extra info, my struggles combined
- seemingly have two "capture" devices
cat /proc/asound/pcm
00-02: CMI8738-MC6 : C-Media PCI IEC958 : playback 1 : capture 1
00-01: CMI8738-MC6 : C-Media PCI 2nd DAC : playback 1
00-00: CMI8738-MC6 : C-Media PCI DAC/ADC : playback 1 : capture 1
but not able to use 0:2 - which I [wrongly] suspected that that is
line-in
(If anyone knows why 0:2 is "capture" device and then "hangs" when
trying to capture from it, then please let me know)
- since not able to record from line-in, trying mic, but mic turns out
to be limited to mono input by hardware [could I be correct here?]
- then found - and set
"Line Capture Route" setting to "on,on,on,on" (was: off,off,off,off)
then able to record stereo stream from line-in finally [still not
knowing what is the above setting's meaning]
Thanks in advance,
Gabor
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