-----Original Message-----
From: Takashi Iwai <tiwai@xxxxxxx>
To: Krivenok Dmitry <_asr_@xxxxxxxx>
Date: Wed, 02 Aug 2006 19:37:46 +0200
Subject: Re: Re[2]: Virtual sound card
>
> At Wed, 02 Aug 2006 21:31:18 +0400,
> Krivenok Dmitry wrote:
> >
> >
> >
> > -----Original Message-----
> > From: Takashi Iwai <tiwai@xxxxxxx>
> > To: Krivenok Dmitry <_asr_@xxxxxxxx>
> > Date: Wed, 02 Aug 2006 18:26:52 +0200
> > Subject: Re: Virtual sound card
> >
> > >
> > > At Wed, 02 Aug 2006 16:16:03 +0400,
> > > Krivenok Dmitry wrote:
> > > >
> > > > Hello All!
> > > >
> > > > What is the simplest way to implement virtual sound card?
> > > > Special kernel module, which represents virtual device driver? Special plugin?
> > > > Or something else?
> > >
> > > How about JACK?
> > >
> > > We have already some alsa-lib plugins, such as file plugin.
> > > You can record a PCM stream to a file while using another real
> > > device.
> > >
> >
> > Yes, I know about file plugin.
> > It works fine with commands like this:
> > aplay -D file myfile.wav
> >
> > Unfortunately, I don't know how to use it with Skype (new version, which supports ALSA).
> > Skype supports real cards (e.g. my VIA8233) and virtual cards (e.g. dummy), i.e.
> > devices with ALSA interface.
> > But "file" isn't ALSA-device.
>
> So, skype checks only the devices of kernel drivers? And no way to
> edit it manually?
>
> Sigh, we really have to provide a good API for the device
> enumeration.
>
> > How to combine file plugin with alsa-device? Is it possible at all?
>
> It's hackish but possible. You can override "hw" and/or "plughw"
> definition as you like, such as
>
> pcm.!hw {
> type file
> slave.pcm {
> type hw
> card 0
> }
> file "foo.out"
> }
>
This is my asoundrc:
krivenok-home linux # cat ~/.asoundrc
pcm.!hw {
type file
slave.pcm {
type hw
card 0
}
file "foo.out"
}
Attempt to play the file:
krivenok-home linux # aplay /tmp/pcm.raw
ALSA lib confmisc.c:670:(snd_func_card_driver) cannot find card '0'
ALSA lib conf.c:3479:(_snd_config_evaluate) function snd_func_card_driver returned error: No such device
ALSA lib confmisc.c:391:(snd_func_concat) error evaluating strings
ALSA lib conf.c:3479:(_snd_config_evaluate) function snd_func_concat returned error: No such device
ALSA lib confmisc.c:1070:(snd_func_refer) error evaluating name
ALSA lib conf.c:3479:(_snd_config_evaluate) function snd_func_refer returned error: No such device
ALSA lib conf.c:3947:(snd_config_expand) Evaluate error: No such device
ALSA lib pcm.c:2146:(snd_pcm_open_noupdate) Unknown PCM default
aplay: main:547: audio open error: No such device
What is wrong?
P.S.
Sorry, if my questions are stupid.
I am new here :)
>
> Takashi
>
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