andrew cooke <andrew <at> acooke.org> writes:
> But I can't work out how to make a stream loop back so that it enters and
> leaves on the same "side" of ALSA. For example, if I have some software
> playing music from a file, I can route that down to hardware OK. But I
> can't seem to route it back to software so that some other program can read
> it from ALSA in the same way that program would read, say, data coming in
> via a soundcard inputs.
>
> This seems absolutely basic, so I think I am missing something really obvious.
>
> One way of describing it would be an ALSA "loopback".
My card is an envy24/ice1712 MAudio Audiophile 2496 and so it seems I should be
able to access the hardware mixer. So I ran envy24 control and made sure that
the mixer was used (HW out now uses digital mix; the LED bars on pcmout 1 and 2
and the hardware mix all move when sound is plyed).
Next I changed my asoundrc to the following:
pcm.!default {
type plug
slave.pcm "maudio"
}
pcm.monitor {
type plug
ttable.0.0 1 # (Out Left)
ttable.0.1 1 # (Out Right)
slave.pcm "maudio"
}
pcm.maudio {
type hw
card 0
device 0
}
ctl.maudio {
type hw
card 0
device 0
}
This works for playback, but when I try to record I get:
: arecord -D monitor foo.wav
arecord: main:550: audio open error: Device or resource busy
This is even when playing sound using:
: aplay /usr/share/sounds/alsa/test.wav
Can anyone correct me? The asoundrc was based on
http://alsa.opensrc.org/1712_.asoundrc and
http://www.linuxquestions.org/hcl/showproduct.php/product/3126
Thanks,
Andrew
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