Type Definition alsa_sys::snd_mixer_event_t

type snd_mixer_event_t = Option<unsafe extern "C" fn(class_: *mut snd_mixer_class_t, mask: c_uint, helem: *mut snd_hctl_elem_t, melem: *mut snd_mixer_elem_t) -> c_int>;

\brief Event callback for the mixer class \param class_ Mixer class \param mask Event mask (SND_CTL_EVENT_*) \param helem HCTL element which invoked the event \param melem Mixer element associated to HCTL element \return zero if success, otherwise a negative error value