fprintf(stderr, "invalid dc code at\n");
av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
static inline int decode_dc(GetBitContext *gb, int component){    int code, diff;    if (component == 0) {        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);    } else {        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);    }    if (code < 0){        fprintf(stderr, "invalid dc code at\n");        return 0xffff;    }    if (code == 0) {        diff = 0;    } else {        diff = get_xbits(gb, code);    }    return diff;}