1 Feb
2007
1 Feb
'07
9:22 p.m.
Hi LAU'ers,
How do I set the hardware sample rate(s) of my
VIA 8237 AC97 sound card?
Seems like a FAQ, yet I'm having trouble finding
a reference.
Alsamixer does not have an item for this.
.asoundrc seems to support sample rate _conversion_
but not setting the hardware rate.
I think I find some reference to a some pcm_set_sample_rate
function in the Alsa libraries, but would rather not write
my own utility for this.
Below follows some data from /proc/asound/V8237/codec97#0/ac97#0-0
Thanks for any suggestions.
--Joel
0-0/0: VIA Technologies VIA1617A
[...]
Current setup
[...]
ADC/DAC loopback : off
Double rate slots: 10/11
Extended ID : codec=0 rev=2 LDAC SDAC CDAC DSA=0 SPDIF DRA VRA
Extended status : LDAC SDAC CDAC SPDIF=3/4 SPDIF VRA
PCM front DAC : 48000Hz
PCM Surr DAC : 48000Hz
PCM LFE DAC : 48000Hz
PCM ADC : 22050Hz
SPDIF Control : Consumer PCM Category=0x2 Generation=1 Rate=48kHz
--
Joel Roth
2:55 p.m.
On Fri, 2007-02-02 at 10:42 +0900, Joel Roth wrote:
Hi LAU'ers,
How do I set the hardware sample rate(s) of my
VIA 8237 AC97 sound card?
in ALSA, applications request specific sample rates when they open the
device. they may or may not get what they asked for. so the question is
really application specific.
10:17 p.m.
On Fri, Feb 02, 2007 at 11:38:20AM -0500, Paul Davis wrote:
On Fri, 2007-02-02 at 10:42 +0900, Joel Roth wrote:
Thanks for clarifying that. I think that another app
(mplayer) from my web browsing may have changed the
rate, or somehow caused it to get stuck.
This is not the first time I've had this problem of
rate-stuck-at-wrong value. I know it is cured by a reboot,
but that is something I prefer not to do if I've got 28
browser tabs and 12 Screen sessions open, if you know what I
mean.
Regards,
--
Joel Roth
Hi LAU'ers,
How do I set the hardware sample rate(s) of my
VIA 8237 AC97 sound card?
in ALSA, applications request specific sample rates when they open the
device. they may or may not get what they asked for. so the question is
really application specific. 
10:33 p.m.
On 2/2/07, Joel Roth <joelz(a)pobox.com> wrote:
Thanks for clarifying that. I think that another app
(mplayer) from my web browsing may have changed the
rate, or somehow caused it to get stuck.
This is not the first time I've had this problem of
rate-stuck-at-wrong value. I know it is cured by a reboot,
but that is something I prefer not to do if I've got 28
browser tabs and 12 Screen sessions open, if you know what I
mean.
Are you referring to analog or SPDIF output? For digital output use iecset:
rlrevell@mindpipe:~$ iecset rate 44100
Mode: consumer
Data: audio
Rate: 44100 Hz
etc.
rlrevell@mindpipe:~$ iecset rate 48000
Mode: consumer
Data: audio
Rate: 48000 Hz
etc.
Apps that change this are supposed to reset it to the original value
when finished but often they don't...
Lee
3 Feb
3 Feb
11:57 a.m.
On Fri, Feb 02, 2007 at 09:33:49PM -0500, Lee Revell wrote:
On 2/2/07, Joel Roth <joelz(a)pobox.com> wrote:
Actually it's the analog output. Uh, it seems okay now.
For serious stuff I should be using my ICE1712, but
right now have very little room on my desk. :-(
Thanks again for your help. The community here is an
amazing resource.
--
Joel Roth
Thanks for clarifying that. I think that another
app
(mplayer) from my web browsing may have changed the
rate, or somehow caused it to get stuck.
This is not the first time I've had this problem of
rate-stuck-at-wrong value. I know it is cured by a reboot,
but that is something I prefer not to do if I've got 28
browser tabs and 12 Screen sessions open, if you know what I
mean.
Are you referring to analog or SPDIF output? For digital output use iecset:
rlrevell@mindpipe:~$ iecset rate 44100
Mode: consumer
Data: audio
Rate: 44100 Hz
etc.
rlrevell@mindpipe:~$ iecset rate 48000
Mode: consumer
Data: audio
Rate: 48000 Hz
etc.
Apps that change this are supposed to reset it to the original value
when finished but often they don't...
Lee 
2 Feb
2 Feb
4:37 p.m.
Joel Roth wrote:
Hi LAU'ers,
How do I set the hardware sample rate(s) of my
VIA 8237 AC97 sound card?
Seems like a FAQ, yet I'm having trouble finding
a reference.
Alsamixer does not have an item for this.
.asoundrc seems to support sample rate _conversion_
but not setting the hardware rate.
I think I find some reference to a some pcm_set_sample_rate
function in the Alsa libraries, but would rather not write
my own utility for this.
Below follows some data from /proc/asound/V8237/codec97#0/ac97#0-0
Thanks for any suggestions.
--Joel
0-0/0: VIA Technologies VIA1617A
[...]
Current setup
[...]
ADC/DAC loopback : off
Double rate slots: 10/11
Extended ID : codec=0 rev=2 LDAC SDAC CDAC DSA=0 SPDIF DRA VRA
Extended status : LDAC SDAC CDAC SPDIF=3/4 SPDIF VRA
PCM front DAC : 48000Hz
PCM Surr DAC : 48000Hz
PCM LFE DAC : 48000Hz
PCM ADC : 22050Hz
SPDIF Control : Consumer PCM Category=0x2 Generation=1 Rate=48kHz
Probably, 48000Hz is the only sample rate supported by your sound card:
http://lalists.stanford.edu/lau/2006/06/0459.html
Ciao,
c.
--
http://www.cesaremarilungo.com
6456
days inactive
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linux-audio-user@lists.linuxaudio.org
6 comments
5 participants
participants (5)
-
Cesare Marilungo -
Joel Roth -
Lars Luthman -
Lee Revell -
Paul Davis