On Tue, 25 Sep 2012, Clemens Ladisch wrote:

> > I'm not completely sure how this stuff works, but I guess there should
> > be some way for an alsa client to rewind the stream, causing one or more
> > urbs to canceled and resubmitted?
> 
> I'm not sure if cancelling and resubmitting iso URBs work in real time on
> all HCDs.  But if you think you can implemented this, feel free to try.

It doesn't work with EHCI.  Cancelling an isochronous URB accomplishes 
practically nothing; the URB is transferred as usual and doesn't 
terminate early.  The only effect is the final value of urb->status.

Alan Stern

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