[alsa-devel] OSX Core Audio ASYNC OUT with rate feedback format ?

Clemens Ladisch clemens at ladisch.de
Fri Oct 1 08:47:28 CEST 2010

Alex wrote:
> I have successfully interfaced the sdr-widget with Linux alsa-driver for ASYNC
> OUT with rate feedback.  Found out after much trial and error and reading of the
> usbaudio alsa-driver source code that you are using 12.13 as the format for the
> feedback rate !!!  I was trying with 10.14 (UAC1 v1.2 specs, I think) in 3 bytes,
> and 16.16 (USB 2.0) in 4 bytes for quite a number of days with no success !!!
> However, 12.13 in 4 bytes, whilst working like a charm with Linux, does NOT work
> with OSX.

Linux currently doesn't look at the endpoint packet size to determine
the feedback format.

I'll change the driver so that it accepts any format.


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