printf("error dc run != 0\n");
av_log(f->avctx, AV_LOG_ERROR, "error dc run != 0\n");
static int decode_i_block(FourXContext *f, DCTELEM *block){    int code, i, j, level, val;    /* DC coef */    val = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3);    if (val>>4){        printf("error dc run != 0\n");    }    if(val)        val = get_xbits(&f->gb, val);    val = val * dequant_table[0] + f->last_dc;    f->last_dc =    block[0] = val;    /* AC coefs */    i = 1;    for(;;) {        code = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3);                /* EOB */        if (code == 0)            break;        if (code == 0xf0) {            i += 16;        } else {            level = get_xbits(&f->gb, code & 0xf);            i += code >> 4;            if (i >= 64) {                printf("run %d oveflow\n", i);                return 0;            }            j= ff_zigzag_direct[i];            block[j] = level * dequant_table[j];            i++;            if (i >= 64)                break;        }    }    return 0;}