Jerry Geis wrote:
> I am searching for a solution to a usb-audio crash...
>
> I thought it was debian specific but it seems related to usb-audio.
>
> I have a computer running centos fine, with onboard audio fine.
> I disabled the onboard audio and put my usb -audio device in this unit
> and I get the same crash.
>
> aplay reports 48000 rate. does it help to change to 44100? how is that
> done? I havent found it.
>
> Is there a "general" fix anyone is aware of.
>
> lsusb reports
> Bus 002 Device 003: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter
>
> Jerry
>
I found this asound.conf file that appears to work (file 1):
defaults.ctl.card 0
defaults.pcm.card 0
pcm.card0 {
type hw
card 0
}
pcm.dmixer {
type dmix
ipc_key 1025
slave {
pcm "hw:0,0"
period_time 0
period_size 2048
buffer_size 32768
rate 48000
}
bindings {
0 0
1 1
}
}
pcm.skype {
type asym
playback.pcm "dmixer"
capture.pcm "card0"
}
pcm.!default {
type plug
slave.pcm "skype"
------------------
compared to this asound.conf that does not (file 2):
# Set default sound card
# Useful so that all settings can be changed to a different card here.
pcm.snd_card {
type hw
card 0
device 0
}
# Allow mixing of multiple output streams to this device
pcm.output {
type dmix
ipc_key 1024
ipc_perm 0660 # Sound for everybody in your group!
slave.pcm "snd_card"
slave {
# This stuff provides some fixes for latency issues.
# buffer_size should be set for your audio chipset.
period_time 0
period_size 1024
buffer_size 32768
}
bindings {
0 0
1 1
}
}
# Allow reading from the default device.
# Also known as record or capture.
pcm.input {
type dsnoop
ipc_key 2048
slave.pcm "snd_card"
## Possible artsd full duplex fix:
# slave {
# period_time 0
# period_size 1024
# buffer_size 8192
# }
bindings {
0 0
1 1
}
}
# This is what we want as our default device
# a fully duplex (read/write) audio device.
pcm.duplex {
type asym
playback.pcm "output"
capture.pcm "input"
}
###################
# CONVERSION PLUG #
###################
# Setting the default pcm device allows the conversion
# rate to be selected on the fly.
# duplex mode allows any alsa enabled app to read/write
# to the dmix plug (Fixes a problem with wine).
pcm.!default {
type plug
slave.pcm "duplex"
}
# Apparently this is wrong (breaks mplayer for me opening the device)
#ctl.!default {
# type plug
# slave.pcm "snd_card"
#}
########
# AOSS #
########
# OSS dsp0 device (OSS needs only output support, duplex will break some stuff)
pcm.dsp0 {
type plug
slave.pcm "output"
}
# OSS control for dsp0 (needed?...this might not be useful)
ctl.dsp0 {
type plug
slave.pcm "snd_card"
}
# OSS control for dsp0 (default old OSS is mixer0)
ctl.mixer0 {
type plug
slave.pcm "snd_card"
}
}
Can someone tell me why file 2 did not work. I have used it for a long
time on NON-USB audio devices.
Using file 1 does work now with the usb device.
Jerry
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