Function stainless_ffmpeg_sys::av_thread_message_queue_set_free_func

pub unsafe extern "C" fn av_thread_message_queue_set_free_func(
    mq: *mut AVThreadMessageQueue, 
    free_func: Option<unsafe extern "C" fn(msg: *mut c_void)>
)

Set the optional free message callback function which will be called if an operation is removing messages from the queue.