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

Clemens Ladisch clemens at ladisch.de
Tue Jul 7 17:10:00 CEST 2009

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,

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