[alsa-devel] BUG: USB audio discontinuities with 'UHCI: implement new semantics for URB_ISO_ASAP'

[Alan Stern]

On Fri, 19 Apr 2013, Joe Rayhawk wrote:

> On Fri, Apr 19, 2013 at 02:18:24PM -0400, Alan Stern wrote:
> > On Fri, 19 Apr 2013, Clemens Ladisch wrote:
> > > Alan Stern wrote:
> > > > +		next = uhci->frame_number + 2;
> > > >
> > > > That 2 is the minimum latency, in frames (one frame per ms).
> > > 
> > > One frame worked fine with the old driver.  What is the reason for
> > > this regression?
> > 
> > Perhaps that was a mistake.  Joe, you can try changing the 2 above to a 
> > 1 to see if it fixes the problem.
> 
> Hey, that worked great! Audio's coming through continuously, now.

This change could be added to the driver, but I would prefer not to.  
In any case, it would be best if the usb-audio driver were changed to
keep the pipeline length at least 2 ms at all times.

Clemens, what do you suggest?

Alan Stern

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