On Mon, Mar 17, 2008 at 5:18 AM, Rene Herman rene.herman@keyaccess.nl 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.