Function avcodec_default_execute

pub unsafe extern "C" fn avcodec_default_execute(
    c: *mut AVCodecContext,
    func: Option<unsafe extern "C" fn(*mut AVCodecContext, *mut c_void) -> i32>,
    arg: *mut c_void,
    ret: *mut i32,
    count: i32,
    size: i32,
) -> i32