On Thu, 2006-01-05 at 13:25 -0500, Paul Fox wrote: > hi -- i understand that sometimes channels are mislabeled, and > that pcm2 sometimes means "headphones", or "main", but > assuming that that's not the case, does the presence of a pcm2 > channel imply that one could play two digital sources at once > (e.g., two wav files) and have them mixed by the hardware? > > if so, what devices would one use? > > i run a whole-house audio system. i have both music (duh. :-) > and also a home-automation menuing system. currently, i run a > nas server on top of the audio device, because it's capable of > mixing inputs from various clients. i use a NAS-enabled mpg123 > to play the music, and i use auplay to send the festival-generated > voice data. so my music can keep playing while i check my > voicemail, for instance. i'd like to eliminate the nas server > (just to make things simpler) but i know of no other easy way to > do pcm signal mixing. (i'd also be happy with having one input > override the other input -- i.e., the voice response menu system > would have priority over music.)
You must be using an old version of ALSA. With 1.0.9 and later this should Just Work - if your hardware can't mix multiple channels then alsa-lib will handle the mixing. You have to make sure all your ALSA apps are using the "default" PCM. Some buggy apps like XMMS default to "hw:0,0" which has always been wrong. Lee ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
