pub unsafe extern "C" fn gst_sdp_message_replace_email(
msg: *mut GstSDPMessage,
idx: c_uint,
email: *const c_char,
) -> GstSDPResult
pub unsafe extern "C" fn gst_sdp_message_replace_email(
msg: *mut GstSDPMessage,
idx: c_uint,
email: *const c_char,
) -> GstSDPResult