Hi! I didn't get this to work either on ALSA 1.0.13. What I was able to do is use one or more plugins on all channels as well as one or more plugins on the first channel and one or more on all. Everything else didn't work, like applying a plugin to the second (third, forth...) channel only, applying one plugin to each channel etc... When I tried such configurations, strange things happend such as mute channels without apperent reasons. Finally, I gave up. I hope that this is a bug, that will be fixed soon. If anyone has a working asoundrc file that does one of the things that I wasn't able to do, please post it here! That'd be great. Regards, Ingo Benjamin Eikel schrieb: > 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. > > Regards, > Benjamin Eikel > > Package versions (I am using Debian unstable): > libasound2 1.0.13-1 > alsa-utils 1.0.13-1 > alsa-base 1.0.13-2 > > My asound.conf: > pcm.upmix_21to51 { > type plug > slave.pcm surround51 > slave.channels 6 > ttable { > 0.0 1 # front left > 1.1 1 # front right > 0.2 1 # rear left > 1.3 1 # rear right > 0.4 0.5 # center > 1.4 0.5 # center > 2.5 1 # subwoofer > } > } > > pcm.upmix_20to51 { > type plug > slave.pcm lowpass_21to21 > slave.channels 3 > ttable { > 0.0 1 # left channel > 1.1 1 # right channel > 0.2 0.5 # mix left and right ... > 1.2 0.5 # ... channel for subwoofer > } > } > > pcm.lowpass_21to21 { > type ladspa > slave.pcm upmix_21to51 > path "/usr/lib/ladspa" > channels 3 > plugins { > 0 { > id 1098 # Identity (Audio) (1098/identity_audio) > policy duplicate > input.bindings.0 "Input"; > output.bindings.0 "Output"; > } > #1 { > # id 1672 # 4 Pole Low-Pass Filter with Resonance (FCRCIA)(1672/lp4pole_fcrcia_oa) > # policy none > # input.bindings.2 "Input"; > # output.bindings.2 "Output"; > # input { > # controls [ 300 0 ] > # } > #} > } > } ------------------------------------------------------------------------- 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
