Function drmtap_convert_format 

pub unsafe extern "C" fn drmtap_convert_format(
    src: *const c_void,
    dst: *mut c_void,
    width: u32,
    height: u32,
    src_stride: u32,
    dst_stride: u32,
    src_format: u32,
    dst_format: u32,
) -> c_int