[alsa-devel] open sound device from asound.conf

[Peter Lukac]

hello all
maybe trivial question...

I want open sound device from /etc/asound.conf with API
snd_pcm_open() but unsuccessfull. As name i'm used:

"plughw:0,0"
"plughw:0,1"
"plughw:0,2"
"plughw:1,0"
"plughw:1,1"
"plughw:1,2"
...
i'm try alternative name with "hw:X,Y"
"hw:0,0"
"hw:0,1"
...
but in this method i'm open only HW device.
I'm get follow error:
ALSA lib pcm_hw.c:1429:(_snd_pcm_hw_open) Invalid value for card 

how can i open my "virtual" device in asound.conf

here is asound.conf:


pcm.!default {
        type plug
        slave.pcm "output"
    }

pcm.output {
    type dmix
    ipc_key 1024
    slave {
        pcm "hw:0,0"
        channels 2
        rate 44100
        format S16_LE
    }
}

pcm.dsp0 {
    type plug
    slave.pcm "output"
}

...exists some universal method how can i open all HW device and "virtual" 
devices?

thanks