Am Montag, 29. Januar 2007 13:28 schrieb Ingo Müller: > 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 Hello Ingo, a developer wrote an answer to my first post and stated that this behaviour was a bug. This will be fixed in the next ALSA release. Regards, Benjamin > > 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 ------------------------------------------------------------------------- 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
