private static extern void avio_context_free(AVIOContext **s);
public static extern int avio_accept(AVIOContext *s, AVIOContext **c);
public static extern int avio_open_dyn_buf(AVIOContext **s);
public static extern int avio_closep(AVIOContext **s);
public static extern int avio_open2(AVIOContext **s, byte *url, int flags, AVIOInterruptCB *int_cb, AVDictionary **options);
public static extern int avio_open(AVIOContext **s, byte *url, int flags);