Lennart Poettering wrote: > On Sun, 21.02.10 12:01, Raymond Yau (superquad.vortex2@xxxxxxxxx) wrote: > > However Simple Mixer API cannot know the subdevice number , you have to use > > control API ( the lower level API used by Simple Mixer API ) > > Unfortunately there is no way from the simple mixer to the lower level > mixer. >From the check_unplugged function in alsa-utils/alsamixer/mixer_widget.c: err = snd_mixer_get_hctl(mixer, mixer_device_name, &hctl); if (err >= 0) ctl = snd_hctl_ctl(hctl); > It would be great if the smixer would include some API that gives me a > hint to which device/subdevice a specific snd_mixer_elem_t belongs to. Often, there is no 1:1 correspondence between mixer elements and PCM devices. Only mixer controls with interface PCM (not MIXER) have (sub-) device numbers, and at the moment this is used only for controls that are associated with the streams of hardware-mixing-capable cards. Getting information about the mixer layout (like the nodes reported by HDA and USB devices) is on the TODO list; the only reason it isn't being implemented is lack of time. Regards, Clemens _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
