At Tue, 20 Nov 2007 01:51:51 +0100, Lennart Poettering wrote: > > 3) Some newer soundcards lack a hw volume control if I understood > correctly. Unfortunately I don't have access to them myself. But > apparently if PulseAudio is run on those devices, volume control in > PulseAudio doesn't work at all. Apparently ALSA uses softvol to add > a software volume control (attenuation) to the mixer on those > soundcards. PA finds that control and makes use of it -- however, > since it accesses the PCM via the raw devices (hw:, surround41: and > so on) softvol doesn't work: i.e. the volume that people can change > through the PA mixer is not reflected in any way in the audio > output. > > Now, is there a way I can detect for a mixer element if it is > "real" or if it is implemented only for the "plughw" PCM? As it > seems the "hw:0" mixer device does contain "virtual" tracks, isn't that a > bit strange? Shouldn't the virtual mixer tracks be available only > in a mixer device "plughw:0"? That at least would be symmetric to > the PCM case, wouldn't it? Check snd_ctl_elem_info_is_user(). All softvol controls are implemented as user elements. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
