Function vaQueryConfigProfiles 

pub unsafe extern "C" fn vaQueryConfigProfiles(
    dpy: VADisplay,
    profile_list: *mut Type,
    num_profiles: *mut c_int,
) -> VAStatus

Query supported profiles The caller must provide a “profile_list” array that can hold at least vaMaxNumProfile() entries. The actual number of profiles returned in “profile_list” is returned in “num_profile”.