On Tue, 19 Dec 2006, Benjamin Eikel wrote: > Hello, > > I am trying to setup a lowpass filter for my subwoofer channel. I used > the configuration template which is given in the ALSA wiki > (http://alsa.opensrc.org/SurroundSound) as a template. > > My asound.conf works when I use it like it is given below (sound from > all speakers). But when I uncomment the second LADSPA plugin for the > lowpass (plugin number 1), then I will only hear sound from the > subwoofer (so only channel number 2 is processed lowpass_21to21). The > other channels seem to be muted. I also tried the same setup which is > given in the Wiki mentioned above, but this does not work at all (the > delay_0.01s plugin is called delay_0,01s on my machine; it think it's > because of the German locale; that's why I am using the ids for the > LADSPA plugins now). I tried to set the policy of my first LADSPA plugin > (number 0) to 'none', but this did not help. I was still hearing only > the sound from the subwoofer. I tried to use 3 plugins for the 3 > channels, each with policy none, but this did not work too. The ALSA > documentation I found (e.g. > http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html) is not > very helpful at all (I am not sure how to set these bindings inside the > plugins correctly). When I connect upmix_20to51 directly to > upmix_21to51, the sound is working fine (of course without lowpass). > > I would greatly appreciate any hint about what I am doing wrong. It was a bug (thanks for this report). The patch (or full file) which corrects "policy none" behaviour is here: http://hg.alsa-project.org/alsa-lib?fd=b838a4b481c2;file=src/pcm/pcm_ladspa.c Or, please, wait for the alsa-lib 1.0.14rc2 package which will contain this change. Jaroslav ----- Jaroslav Kysela <perex@xxxxxxx> Linux Kernel Sound Maintainer ALSA Project, SUSE Labs ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
