O Sun, 27 Dec 2009, Devin Heitmueller wrote: > I am working on some code which captures from one PCM device and plays > to another, based off of the latency.c found in alsa-lib. I noticed > something strange: > > The code works if I set the capture device to hw:1,0 and playback > device to hw:0,0. However, if I change the playback device to > "default:0", the snd_pcm_link() call fails with -ENOSYS (error 38). > > If I dump out the properties, I can see that the the default device > *is* mapped to device 0,0, so it's not clear why the behaviour would > differ. > > My goal was just to playback to whatever the default device is, and I > was under the impression that default:0 should be equivalent to > "hw:0,0". Can anyone offer any brief explanation as to why the > snd_pcm_link() call would fail? Some alsa-lib plugins do not have the link feature implemented. If you use snd_pcm_dump(), you may list all plugins in chain. I think that dmix is in path. And no, "default:0" is NOT equivalent to "hw:0,0". Jaroslav ----- Jaroslav Kysela <perex@xxxxxxxx> Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
