2010/2/24 Clemens Ladisch <clemens@xxxxxxxxxx> > Lennart Poettering wrote: > > On Tue, 23.02.10 11:08, Clemens Ladisch (clemens@xxxxxxxxxx) wrote: > > > Lennart Poettering wrote: > > > > 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); > > > > But that still doesn't give me a hint which snd_ctl_eleme_t belongs to > > which snd_mixer_eleme_t, does it? > > Not really; the point of the simple mixer interface is to abstract away > some of the ctl naming conventions. > > > > > 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. > > > > Which are not that many, right? Not HDA at least? > > No, most recent hardware was designed for software mixing. Only the > snd-emu10k1, snd-via82xx and snd-ymfpci drivers implement such controls. > > > Regards, > Clemens > > However the playback subdevices of some HDA codec did not support the same range of channels (e.g. vt1708s has two playback subdevices , if independent HP mode is ON , one subdevice can only suppport 2 channels and the other subdevices support 2 ,4 ,6 if independent HP mode is OFF , the subdevice may support 2, 4, 6 and 8 channels _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
