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_channel_ (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. CONFIDENTIALITY NOTICE: The contents of this email are confidential and for the exclusive use of the intended recipient. If you receive this email in error, please delete it from your system immediately and notify us either by email, telephone or fax. You should not copy, forward, or otherwise disclose the content of the email. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
