Re: [alsa-devel] /usr/share/alsa/alsa.conf :and file extention

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On Mon, Mar 17, 2008 at 5:18 AM, Rene Herman <rene.herman@xxxxxxxxxxxx> wrote:
On 17-03-08 03:57, Alexander Indenbaum wrote:

> I'm playing with embedded system without any hardware sound device. I'd like
> to grab sound from ALSA application, for instance Firefox displaying YouTube
> clip inside flash plugin and to store  output PCM stream into file on local
> disk. I got an advice to use File extension. So I defined following
> /usr/share/alsa/alsa.conf

Don't do it there. Use /etc/asound.conf or $HOME/.asoundrc ...

Generally I'd agree with you that $HOME/.asoundrc is way to go if it was my desktop workstation. But this is an embedded system, so I'd like to force it on system level.


> pcm.default{
>         type
> file
>         file
> /tmp/pcm.out
> }

... and make it

pcm.!default {
        type    file
        slave   {
                pcm     null
        }
        file    "/tmp/pcm.out"
}

Still it does not  work ( I still use system alsa.conf though ). Now I get:
"Unknown PCM null"
"Unknown PCM plughw:0,0"


Exactly why you need that slave definition I'm not sure either, but it seems
you do. Also note that /tmp/pcm.out will be headerless PCM and is recreated
for individual opens. I don't believe there's an append mode or anything
(and you'd need to make sure that everyone plays the same format) so not
toot sure if this is what you need to have a catch all audio-sink...

You touching here an interesting point. How  indeed I could get an PCM header?
 


Rene.

Thank you for your help, Rene.

--
Alexander Indenbaum
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