[alsa-devel] [PATCH 3/4] ALSA: usb-audio: parse UAC2 sample rate ranges correctly

Daniel Mack daniel at caiaq.de
Mon Jun 14 14:41:31 CEST 2010

On Fri, Jun 11, 2010 at 10:59:44PM +0800, Alex Lee wrote:
> If the device has a variable clock, it may report a RES of only 1.  So you
> may end up with thousands (and even millions) of sample rates.  It might be
> better to have separate code to cater to discrete clocks vs variable clocks.

Just for the records: this is exactly what Mac OS X does, and it will
comsume 100% CPU when a device with such descriptors is plugged in. So
even though this is now sanely handled by ALSA, it really shouldn't be
done that way by implementors.


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