At Wed, 02 Aug 2006 21:57:52 +0400,
Krivenok Dmitry wrote:
>
>
>
> -----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?
It should work if you pass '-D hw'.
When -D is omitted, aplay opens "default" PCM. So, you have to
override this one, too, for example,
pcm.!default "hw"
Takashi
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