Am 23.07.2010 11:12, schrieb Peter Lukac:

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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?

Did you try to open "default", "output" or "dsp0" since these are the names of your pcm defines?

thanks for reply... Yes it works..(device is open) but i don't want open device with "hard coded" name because this name can be changed..I want to use iterations

2010/7/23 Sebastian H. vand2@gmx.de

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

Did you try to open "default", "output" or "dsp0" since these are the names of your pcm defines?

thanks for reply... Yes it works..(device is open) but i don't want open device with "hard

coded"

...

name because this name can be changed..I want to use iterations

I'm just a user but I guess you would have to parse the pcm subsection of the Alsa configuration tree with the snd_config_* functions.

http://www.alsa-project.org/alsa-doc/alsa-lib/group___config.html

Sebastian

Use namehint , but your asoundrc must have correct syntax since the parser is unable to know any spelling mistake

https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4298

/usr/share/alsa/alsa.conf

# show all name hints also for definitions without hint {} section defaults.namehint.showall off <---- on # show just basic name hints defaults.namehint.basic on # show extended name hints defaults.namehint.extended off <---- on