av_des_crypt_mac  325 libavutil/des.c     av_des_crypt_mac(d, dst, src, count, iv, decrypt, 0);
av_des_crypt_mac  330 libavutil/des.c     av_des_crypt_mac(d, dst, src, count, (uint8_t[8]) { 0 }, 0, 1);