internal static extern void sp_playlist_add_callbacks(IntPtr playlistPtr, ref PlaylistCallbacks callbacksPtr, IntPtr userdataPtr);
internal static extern Error sp_playlist_add_callbacks(IntPtr playlistPtr, ref PlaylistCallbacks callbacksPtr, IntPtr userdataPtr);
internal static extern void sp_playlist_remove_callbacks(IntPtr playlistPtr, ref PlaylistCallbacks callbacksPtr, IntPtr userdataPtr);
internal static extern Error sp_playlist_remove_callbacks(IntPtr playlistPtr, ref PlaylistCallbacks callbacksPtr, IntPtr userdataPtr);