> -----Ursprungligt meddelande----- > Från: Mårten Gustafsson > [mailto:marten.gustafsson@xxxxxxxxxxxxxx] För reklam@xxxxxxxxxxxxxx > Skickat: den 27 februari 2009 00:32 > Till: 'alsa-user@xxxxxxxxxxxxxxxxxxxxx' > Ämne: Re: Alsa-lib and ladspa > > > I read about bug fixes for alsa when using ladspa plugins and > > multi-channel audio. My setup is kernel 2.6.21.7 with alsa-lib > > (1.0.17a). However, I'm wondering what if any other alsa > packages I'm > > required to upgrade in order for ladspa multi-channel > plugins to work? > > Specifically, I'm attempting to create a 2.1 low pass filter (see > > > http://alsa.opensrc.org/index.php/Low-pass_filter_for_subwoofer_channe > > l_ (HOWTO)). I'm attempting to use the referred to asound.conf from > > the low pass filter HOW-TO but I've noticed the following: > > > > 1) The upmix_20to51 device is listed as type "plug" but > seems to need > > to be "route" ? I use "plug" I get the error "pcm_params.c:170: > > snd1_pcm_hw_param_get_min: Assertion > `!snd_interval_empty(i)' failed" > > 2) If I directly use the upmix_20to51 device, but change > the slave to > > "plughw", I get the expected 3 channel output > > 3) If I directly use the lowpass_21to21 device, but change > the slave > > to "plughw", low pass filtering works > > 4) If I directly use the upmix_21to51 device, but change > the slave to > > "plughw", I get the expected 6 channel output > > > > So my plug-in chain seem to have issues communicating with > each other? > > Anybody with similar experiences, thoughts, or comments? It > would be > > very appreciated. > > Hi Peter > > Did you ever solve this? I am having the same problem. I have > tried two sound cards with the same result. I am using the > latest available alsa rpms for opensuse 11.1 on an amd64 box. > > Thanks > > Mårten Gustafsson I solved the problem by replacing the "plug" plugins with "route" and "lfloat" plugins. There is most certainly a bug in "plug" plugin. ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
