> > But the root cause is still that streaming ISO with just one URB is > > not a viable approach ... the driver on top of usbcore was doing the > > wrong thing. > > I understand now that's the fundamental Linux design, but only Linux > seems to implement it this way. MacOSX can do 2ms sample/play > reliably,
Really? With URBs having 1 uframe periodicity?? I doubt it. Maybe with ones having 1 frame (8 uframe) periodicity; in those cases the system will often be fast enough. > FWIW, I'm suggesting not a fundamental redesign, but the following: > > a) do not release the schedule until it would have XRUN (wait for an empty > slot) > b) a release time 'completion' at the XRUN point (when the next > scheduled slot would go by unfilled) to give usbaudio a chance to push > out a dummy URB if it desires to keep the ISO going. For periodicity == 1 uframe, this represents no change... ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
