On Tue, 2011-06-07 at 15:58 +0300, Tanu Kaskinen wrote: > On Tue, 2011-06-07 at 15:33 +0300, Lasse K?rkk?inen wrote: > > Hi, > > > > I tried to get as low latency as possible but there is a very > > significant delay. Could someone please have a look at this simple (and > > hacky) audio loopback test and point out if it could be changed to run > > at lower latency? Do not mind the shortcuts taken or the obvious > > distortion that occurs because capture and playback aren't synchronized > > - this is simply a minimalistic latency test. > > > > http://codepad.org/nKNT4SyG > > > > Another similar test application written directly for ALSA runs with > > very low latency on the same system (with pasuspender), so it is not a > > hardware or driver issue. For the record, I am using generic USB > > microphone for capture and HDA-Intel for playback. > > The buffer attributes aren't right. Set fragsize to 0 and maxlength to > -1. If you set fragsize to -1 like you do now, you get the default > latency for capture, which is probably pretty large. Sorry, ignore this. You already set the attributes as I suggested - the doxygen documentation sorts the struct fields alphabetically, which confused me. -- Tanu
