Re: [alsa-devel] alsaloop problems; ALSA streaming tutorial (resend)

Dne 24.10.2018 v 10:01 frederik@ofb.net napsal(a):

Dear Mark (cc'ing ALSA-user, ALSA-devel)

Thank you for your tutorial

http://www.pogo.org.uk/~mark/trx/streaming-desktop-audio.html

I found it helpful and clearly-written (although missing a "}" brace and I think it should be "-P" instead of "-p"...).

I got as far as trying the 'alsaloop' example. It seems very finicky, sometimes I am able to play a test.wav cleanly through the loopback device, and sometimes there are a lot of crackles and I get errors like

playback hw:0: change avail_min=2968
playback hw:0: change avail_min=2972
playback hw:0: change avail_min=2976
underrun for playback hw:0
  last write before 9.8370ms, queued 10.0000ms/0.0000ms -> missing -0.1630ms
  expected 10.0000ms, processing 0.1910ms, max missing 0.0443ms
  last wake 0.0350ms, last check 0.0350ms, avail_min 32.0000ms
  max buf 40.0000ms, pfilled 0.0000ms, cfilled 10.0000ms
  job started before 0.0110ms

Could you retest with the latest? I tried to fix the avail_min issue here:

http://git.alsa-project.org/?p=alsa-utils.git;a=commitdiff;h=8bc1bc53d0a8b37...

Jaroslav