Type Definition alsa_sys::snd_mixer_callback_t

type snd_mixer_callback_t = Option<unsafe extern "C" fn(ctl: *mut snd_mixer_t, mask: c_uint, elem: *mut snd_mixer_elem_t) -> c_int>;

\brief Mixer callback function \param mixer Mixer handle \param mask event mask \param elem related mixer element (if any) \return 0 on success otherwise a negative error code