* Wrong sample rate user space -> kernel space?
@ 2009-07-07 14:29 Daniel Mack
2009-07-07 15:10 ` Clemens Ladisch
0 siblings, 1 reply; 3+ messages in thread
From: Daniel Mack @ 2009-07-07 14:29 UTC (permalink / raw)
To: alsa-devel
On a PXA embedded board, the sample rate propagation from user space to
kernel space seems to be wrong.
When I start aplay (v1.0.19) from userspace like this ...
# aplay -f dat /dev/urandom
Playing raw data '/dev/urandom' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
... params_rate(params) in my snd_soc_ops .hw_params callback returns
88200, not 48000.
Can anyone reproduce this? I guess this is unrelated to PXA and ASoC.
Thanks,
Daniel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Wrong sample rate user space -> kernel space?
2009-07-07 14:29 Wrong sample rate user space -> kernel space? Daniel Mack
@ 2009-07-07 15:10 ` Clemens Ladisch
2009-07-07 15:24 ` Daniel Mack
0 siblings, 1 reply; 3+ messages in thread
From: Clemens Ladisch @ 2009-07-07 15:10 UTC (permalink / raw)
To: Daniel Mack; +Cc: alsa-devel
Daniel Mack wrote:
> On a PXA embedded board, the sample rate propagation from user space to
> kernel space seems to be wrong.
>
> When I start aplay (v1.0.19) from userspace like this ...
>
> # aplay -f dat /dev/urandom
> Playing raw data '/dev/urandom' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
>
> ... params_rate(params) in my snd_soc_ops .hw_params callback returns
> 88200, not 48000.
It might be possible that userspace converts the sample rate because it
thinks that the driver doesn't support 48 kHz.
Is there a converter plugin in the output of "aplay -f dat -v /dev/urandom"?
Best regards,
Clemens
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Wrong sample rate user space -> kernel space?
2009-07-07 15:10 ` Clemens Ladisch
@ 2009-07-07 15:24 ` Daniel Mack
0 siblings, 0 replies; 3+ messages in thread
From: Daniel Mack @ 2009-07-07 15:24 UTC (permalink / raw)
To: Clemens Ladisch; +Cc: alsa-devel
On Tue, Jul 07, 2009 at 05:10:00PM +0200, Clemens Ladisch wrote:
> Daniel Mack wrote:
> > On a PXA embedded board, the sample rate propagation from user space to
> > kernel space seems to be wrong.
> >
> > When I start aplay (v1.0.19) from userspace like this ...
> >
> > # aplay -f dat /dev/urandom
> > Playing raw data '/dev/urandom' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
> >
> > ... params_rate(params) in my snd_soc_ops .hw_params callback returns
> > 88200, not 48000.
>
> It might be possible that userspace converts the sample rate because it
> thinks that the driver doesn't support 48 kHz.
>
> Is there a converter plugin in the output of "aplay -f dat -v /dev/urandom"?
Argh. Of course, you're right. Sorry for the noise. Literally ;)
Daniel
^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-07-07 14:29 Wrong sample rate user space -> kernel space? Daniel Mack
2009-07-07 15:10 ` Clemens Ladisch
2009-07-07 15:24 ` Daniel Mack
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