jack 0.13.5

Real time audio and midi with JACK.
Documentation 
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unsafe extern "C" fn test_info_callback(_msg: *const libc::c_char) {}
unsafe extern "C" fn test_error_callback(_msg: *const libc::c_char) {}

#[test]
fn can_set_logger() {
    // TODO: This passes on JACK2 1.9.22, but not 1.9.20 which is used in the GitHub runners.
    std::panic::catch_unwind(|| {
        crate::set_logger(crate::LoggerType::Custom {
            info: test_info_callback,
            error: test_error_callback,
        });
        #[cfg(feature = "dynamic_loading")]
        #[allow(unpredictable_function_pointer_comparisons)]
        unsafe {
            let lib = jack_sys::library().unwrap();
            type LogFn = unsafe extern "C" fn(*const libc::c_char);
            assert!(
                **lib.get::<*const LogFn>(b"jack_info_callback").unwrap() == test_info_callback
            );
            assert!(
                **lib.get::<*const LogFn>(b"jack_error_callback").unwrap() == test_error_callback
            );
        }
        #[cfg(not(feature = "dynamic_loading"))]
        {
            assert!(unsafe { crate::jack_sys::jack_info_callback } == Some(test_info_callback),);
            assert!(unsafe { crate::jack_sys::jack_error_callback } == Some(test_error_callback),);
        }
    })
    .ok();
    super::log_to_stdio(); // Revert to enable debugging in other tests.
}