On Wed, 26 Nov 2003, Takashi Iwai wrote:
>> On the same machine, alsa-driver-0.9.8 works fine, but not with 1.0.0pre1
>> and 1.0.0pre3.
> what do you mean exactly "don't work" in the above?
> the operation is blocked, or returns an error?
> if it's blocked, check /proc/asound/card0/pcm0*/sub0/* files.
I think I found the problem. In 1.0.0preX, the supported sampling rate
is limited to 48000Hz and this causes all kinds of problems if running
with lower rates (I've mostly tested running at 8000Hz) - i.e. when
using alsa-lib for sr-conversion.
With 1.0.0pre3, for example "arecord -r 8000 - |aplay -r 8000 -" produces
constant xruns. A similar app that relies on poll()/select(), fails even
more severely. When looking at...
/proc/asound/card0/pcm0p/sub0/hw_params and
/proc/asound/card0/pcm0c/sub0/hw_params
.. the rate is locked to 48000 with 1.0.0pre3. On the same machine with
0.9.8, the hw-rate is 8000. I've used the 'default' PCM device in all my
tests.
> does this laptop have multiple codecs? you can find them in
> /proc/asound/card0/codec97#* directories.
Nopes, '/proc/asound/card0/codec97#0/ac97#0-0' is the only one,
and contains:
--cut--
0-0/0: Cirrus Logic CS4299 rev 6
Capabilities : -headphone out-
DAC resolution : 20-bit
ADC resolution : 18-bit
3D enhancement : Crystal Semi 3D Stereo Enhancement
Current setup
Mic gain : +0dB [+0dB]
POP path : pre 3D
Sim. stereo : off
3D enhancement : off
Loudness : off
Mono output : MIX
Mic select : Mic1
ADC/DAC loopback : off
Extended ID : codec=0 rev=0 AMAP DSA=0 VRA
Extended status : VRA
PCM front DAC: 48000Hz
PCM ADC : 48000Hz
SPDIF Control: Consumer PCM Category=0x2 Generation=1 Rate=48kHz
--cut--
--
http://www.eca.cx
Audio software for Linux!
---
This SF.net email is sponsored by: SF.net Giveback Program.
Does SourceForge.net help you be more productive? Does it
help you create better code? SHARE THE LOVE, and help us help
YOU! Click Here: http://sourceforge.net/donate/
___
Alsa-devel mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/alsa-devel
