> 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 ------------------------------------------------------------------------------ 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
