On Thu, May 16, 2013 at 09:48:42 +0200, B. Zhang wrote: > On 05/15/2013 10:25 PM, B. Zhang wrote: > >Hi, > > > >Using mpd and kernel 3.9.2, when I switch tracks and the next > >track is a different sample rate there is a fairly loud popping. > >There is no noise during playback. Sometimes this happens even the > >next track has the same sample rate. > >I use a usb interface is M2Tech hiface2 (XMOS UAC2, > >http://www.m2tech.biz/hiface2.html ). > > > >But it works with kernel 3.1.10. > > > >It seems this is a synchronization lost problem with soft mute DAC. > > > >I wonder if this problem is related to usb feedback (the hiface2 > >is asynchronous). > >With kernel 3.1.10, Feedback Format = 16.16 > >With kernel 3.9.2, Feedback Format = 8.16 Packet Size = 0 > > Maybe it's a URBs problem ? > URBs = 8 [ 8 8 8 8 8 8 8 8 ] when using 3.1.10, but not this line > with 3.9.2. No, both of those are caused by changes in the proc output. The URB line was removed in kernel 3.5. There seems to be something wrong with the feedback format output, as freqshift is only set for the data_endpoint, but syncmaxsize is only set for the sync_endpoint. I'll try to come up with a fix for that. As to your actual problem with the pops, I don't have any ideas. Do you get the same behavior when stopping and starting playback? Torstein ------------------------------------------------------------------------------ AlienVault Unified Security Management (USM) platform delivers complete security visibility with the essential security capabilities. Easily and efficiently configure, manage, and operate all of your security controls from a single console and one unified framework. Download a free trial. http://p.sf.net/sfu/alienvault_d2d _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
