[alsa-devel] Wrong sample rate user space -> kernel space?

[Daniel Mack]

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