+static int vout_window_start(void *func, va_list ap)
+{
+ int (*activate)(vout_window_t *, const vout_window_cfg_t *) = func;
+ vout_window_t *wnd = va_arg(ap, vout_window_t *);
+ const vout_window_cfg_t *cfg = va_arg(ap, const vout_window_cfg_t *);
+
+ return activate(wnd, cfg);
+}
+