On Fri, Jan 10, 2014 at 7:48 AM, Clemens Ladisch <clemens@xxxxxxxxxx> wrote: > Tim Goetze wrote: >> [Clemens Ladisch] >>> In most cases, the ALSA buffer/period parameters directly reflect >>> hardware parameters, but in the case of protocols like USB where it is >>> not possible to transfer data directly out of a ring buffer, there is an >>> additional packet queue, which adds latency. (The length of that queue >>> is either constant or proportional to the period size, depending on the >>> driver.) >> >> Thanks you Clemens for clearing that up. How would one go about >> determining the size of this queue between ALSA and USB? > > In the case of the current version of snd-usb-audio, the queue has the > same length as the buffer, but never more than 18 ms. > Hi Clemens! Is there anything that happened to snd-usb-audio (or the underlying usb kernel code) between 3.0.36 and 3.6+ that might explain why it is no longer possible to get clean audio with a frame/period size of less than 128/2 using jack on the Scarlett 2i4? James _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
