Hi Fons, * On 10/19/2011 12:43 AM, Fons Adriaensen wrote: > On Tue, Oct 18, 2011 at 05:46:12PM -0400, S. Massy wrote: > >> http://alsa.opensrc.org/Jack_and_Loopback_device_as_Alsa-to-Jack_bridge > > Interesting page ! > >> I compiled the aloop module and it works fine, but when I try setting up >> the asoundrc as described, and use the device, I get. >> ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to open slave >> aplay: main:654: audio open error: Invalid argument >> >> Does anyone know what this uninformative error mean? I don't. >> Has anybody ever >> had luck with a similar setup? yes, aloop + alsa_in/alsa_out work just fine here since over a year. I only use the snd-aloop module from the alsa-drivers. All other alsa kernel stuff is from the original kernel. The only problem is: the device needs to be closed during suspend/resume; otherwise the systems hangs on resume. I've added killall alsa_in alsa_out; kill -HUP `lsof -t /dev/snd/pcmC1D*`; and restart commands to /etc/pm/sleep.d/ for that. I can't use `alsa force-unload` because that'd kill jackd, too. > I get similar errors, except that the second one is > 'Device or resource busy' instead of 'Invalid argument'. The loopback devices 'ploop', 'cloop' can only be accessed by one process at a time. If you try to start multiple processes accessing them you'll get a 'Device or resource busy'. Maybe the device-order changed with the aloop module being loaded during boot and your jackd is using on it.. that happened to me at first. Multiple clients can connect to -dLoopback to play/record via dmix. jackd -d alsa -d hw:2 alsa_out -j ploop -dploop aplay -dLoopback some_file.wav & aplay -dLoopback some_other_file.wav & The .asoundrc from the alsa-wiki, configures -dLoopback as default. so `aplay some_file.wav` works just the same. > Maybe it's the dmix on top of all the rest. I've seen > other cases where dmix wouldn't mix (pun not intended) > with its peers. you must mean /selected peers/. I'm not one of them :-p The .asoundrc from the page works fine without modifications: http://alsa.opensrc.org/Jack_and_Loopback_device_as_Alsa-to-Jack_bridge#asoundrc_definition Cheers! robin _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
