Function gst::ffi::g_convert_with_iconv

pub unsafe extern "C" fn g_convert_with_iconv(
    str: *const gchar, 
    len: gssize, 
    converter: GIConv, 
    bytes_read: *mut gsize, 
    bytes_written: *mut gsize, 
    error: *mut *mut GError
) -> *mut gchar