pub unsafe extern "C" fn gst_pad_forward(
pad: *mut GstPad,
forward: GstPadForwardFunction,
user_data: gpointer,
) -> gboolean
pub unsafe extern "C" fn gst_pad_forward(
pad: *mut GstPad,
forward: GstPadForwardFunction,
user_data: gpointer,
) -> gboolean