Hi Julien, On 04/02/2014 10:12 AM, julien@xxxxxxxxxxxx wrote: > On 03/31/2014 12:02 PM, Daniel Mack wrote: >> If you're really certain about this, and if you can rule out all other >> components than the kernel, please do a git bisect to find which commit >> causes this regression. Depending on how long it takes you to tell >> whether a kernel version is affected, this should not take too much >> time. Some instruction can be found here for instance: > > There you go, > > commit 976b6c064a957445eb0573b270f2d0282630e9b9 > Author: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > Date: Tue Sep 24 15:51:58 2013 -0400 > > ALSA: improve buffer size computations for USB PCM audio > > Note that amongst other things, this patch removes the ability to pass > the "nrpacks" parameter to the snd-usb-audio driver, but I would tend to > think that the cracks/jitter have to do due with the new URB allocation > code. In fact, I can confirm that running the predecessor tree > (e8bc994), the phenomenon doesn't happen, with or without this parameter. > >>> - Now When xbmc plays 24/192 content correctly, all I know is that >>> /proc/asound/card/*/stream* confirms that the steam is 24/192, but xbmc >>> must be either doing something to the stream, or streaming it a little >>> bit differently than sox/aplay. > > Now again, as said in my previous email, my observations are essentially > valid for this specific version of xmbc. aplay, sox, and all other audio > apps I have toyed with to playback 24/192 content are subject to similar > cracks/jitter, whatever the kernel. > > Don't hesitate to let me know if I can help in any way. Thanks. I have no time currently to look into today and tomorrow, but I copied Alan and Clemens, hence the full quote above. The original problem description is here: http://sourceforge.net/p/alsa/mailman/message/32159984/ Daniel ------------------------------------------------------------------------------ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
