vc1.c

    return 0;
}

/** Decode intra block in inter frames - more generic version than vc1_decode_i_block
 * @param v VC1Context
 * @param block block to decode
 * @param coded are AC coeffs present or not
 * @param mquant block quantizer
 * @param codingset set of VLC to decode data
 */
static int vc1_decode_intra_block(VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)
{
    GetBitContext *gb = &v->s.gb;
    MpegEncContext *s = &v->s;
    int dc_pred_dir = 0; /* Direction of the DC prediction used */
    int run_diff, i;
    int16_t *dc_val;
    int16_t *ac_val, *ac_val2;
    int dcdiff;
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
    int a_avail = v->a_avail, c_avail = v->c_avail;
    int use_pred = s->ac_pred;
    int scale;
    int q1, q2 = 0;

    /* XXX: Guard against dumb values of mquant */
    mquant = (mquant < 1) ? 0 : ( (mquant>31) ? 31 : mquant );

    /* Set DC scale - y and c use the same */
    s->y_dc_scale = s->y_dc_scale_table[mquant];
    s->c_dc_scale = s->c_dc_scale_table[mquant];

    /* Get DC differential */
    if (n < 4) {
        dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
    } else {
        dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
    }
    if (dcdiff < 0){
        av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
        return -1;
    }
    if (dcdiff)
    {
        if (dcdiff == 119 /* ESC index value */)
        {
            /* TODO: Optimize */
            if (mquant == 1) dcdiff = get_bits(gb, 10);
            else if (mquant == 2) dcdiff = get_bits(gb, 9);
            else dcdiff = get_bits(gb, 8);
        }
        else
        {
            if (mquant == 1)
                dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;
            else if (mquant == 2)
                dcdiff = (dcdiff<<1) + get_bits(gb, 1) - 1;
        }
        if (get_bits(gb, 1))
            dcdiff = -dcdiff;
    }

    /* Prediction */
    dcdiff += vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);
    *dc_val = dcdiff;

    /* Store the quantized DC coeff, used for prediction */

    if (n < 4) {
        block[0] = dcdiff * s->y_dc_scale;
    } else {
        block[0] = dcdiff * s->c_dc_scale;
    }
    /* Skip ? */
    run_diff = 0;
    i = 0;

    //AC Decoding
    i = 1;

    /* check if AC is needed at all and adjust direction if needed */
    if(!a_avail) dc_pred_dir = 1;
    if(!c_avail) dc_pred_dir = 0;
    if(!a_avail && !c_avail) use_pred = 0;
    ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
    ac_val2 = ac_val;

    scale = mquant * 2 + v->halfpq;

    if(dc_pred_dir) //left
        ac_val -= 16;
    else //top
        ac_val -= 16 * s->block_wrap[n];

    q1 = s->current_picture.qscale_table[mb_pos];
    if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.qscale_table[mb_pos - 1];
    if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
    if(n && n<4) q2 = q1;

    if(coded) {
        int last = 0, skip, value;
        const int8_t *zz_table;
        int k;

        zz_table = vc1_simple_progressive_8x8_zz;

        while (!last) {
            vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
            i += skip;
            if(i > 63)
                break;
            block[zz_table[i++]] = value;
        }

        /* apply AC prediction if needed */
        if(use_pred) {
            /* scale predictors if needed*/
            if(q2 && q1!=q2) {
                q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
                q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

                if(dc_pred_dir) { //left
                    for(k = 1; k < 8; k++)
                        block[k << 3] += (ac_val[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;
                } else { //top
                    for(k = 1; k < 8; k++)
                        block[k] += (ac_val[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;
                }
            } else {
                if(dc_pred_dir) { //left
                    for(k = 1; k < 8; k++)
                        block[k << 3] += ac_val[k];
                } else { //top
                    for(k = 1; k < 8; k++)
                        block[k] += ac_val[k + 8];
                }
            }
        }
        /* save AC coeffs for further prediction */
        for(k = 1; k < 8; k++) {
            ac_val2[k] = block[k << 3];
            ac_val2[k + 8] = block[k];
        }

        /* scale AC coeffs */
        for(k = 1; k < 64; k++)
            if(block[k]) {
                block[k] *= scale;
                if(!v->pquantizer)
                    block[k] += (block[k] < 0) ? -mquant : mquant;
            }

        if(use_pred) i = 63;
    } else { // no AC coeffs
        int k;

        memset(ac_val2, 0, 16 * 2);
        if(dc_pred_dir) {//left
            if(use_pred) {
                memcpy(ac_val2, ac_val, 8 * 2);
                if(q2 && q1!=q2) {
                    q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
                    q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
                    for(k = 1; k < 8; k++)
                        ac_val2[k] = (ac_val2[k] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;
                }
            }
        } else {//top
            if(use_pred) {
                memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);
                if(q2 && q1!=q2) {
                    q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
                    q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
                    for(k = 1; k < 8; k++)
                        ac_val2[k + 8] = (ac_val2[k + 8] * q2 * vc1_dqscale[q1 - 1] + 0x20000) >> 18;
                }
            }
        }

        /* apply AC prediction if needed */
        if(use_pred) {
            if(dc_pred_dir) { //left
                for(k = 1; k < 8; k++) {
                    block[k << 3] = ac_val2[k] * scale;
                    if(!v->pquantizer && block[k << 3])
                        block[k << 3] += (block[k << 3] < 0) ? -mquant : mquant;
                }
            } else { //top
                for(k = 1; k < 8; k++) {
                    block[k] = ac_val2[k + 8] * scale;
                    if(!v->pquantizer && block[k])
                        block[k] += (block[k] < 0) ? -mquant : mquant;
                }
            }
            i = 63;
        }
    }
    s->block_last_index[n] = i;

    return 0;
}

/** Decode P block
 */
static int vc1_decode_p_block(VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block)
{
    MpegEncContext *s = &v->s;
    GetBitContext *gb = &s->gb;
    int i, j;
    int subblkpat = 0;
    int scale, off, idx, last, skip, value;
    int ttblk = ttmb & 7;

    if(ttmb == -1) {
        ttblk = ttblk_to_tt[v->tt_index][get_vlc2(gb, vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];
    }
    if(ttblk == TT_4X4) {
        subblkpat = ~(get_vlc2(gb, vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);
    }
    if((ttblk != TT_8X8 && ttblk != TT_4X4) && (v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))) {
        subblkpat = decode012(gb);
        if(subblkpat) subblkpat ^= 3; //swap decoded pattern bits
        if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) ttblk = TT_8X4;
        if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) ttblk = TT_4X8;
    }
    scale = 2 * mquant + v->halfpq;

    // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT
    if(ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {
        subblkpat = 2 - (ttblk == TT_8X4_TOP);
        ttblk = TT_8X4;
    }
    if(ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {
        subblkpat = 2 - (ttblk == TT_4X8_LEFT);
        ttblk = TT_4X8;
    }
    switch(ttblk) {
    case TT_8X8:
        i = 0;
        last = 0;
        while (!last) {
            vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
            i += skip;
            if(i > 63)
                break;
            idx = vc1_simple_progressive_8x8_zz[i++];
            block[idx] = value * scale;
            if(!v->pquantizer)
                block[idx] += (block[idx] < 0) ? -mquant : mquant;
        }
        s->dsp.vc1_inv_trans_8x8(block);
        break;
    case TT_4X4:
        for(j = 0; j < 4; j++) {
            last = subblkpat & (1 << (3 - j));
            i = 0;
            off = (j & 1) * 4 + (j & 2) * 16;
            while (!last) {
                vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
                i += skip;
                if(i > 15)
                    break;
                idx = vc1_simple_progressive_4x4_zz[i++];
                block[idx + off] = value * scale;
                if(!v->pquantizer)
                    block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;
            }
            if(!(subblkpat & (1 << (3 - j))))
                s->dsp.vc1_inv_trans_4x4(block, j);
        }
        break;
    case TT_8X4:
        for(j = 0; j < 2; j++) {
            last = subblkpat & (1 << (1 - j));
            i = 0;
            off = j * 32;
            while (!last) {
                vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
                i += skip;
                if(i > 31)
                    break;
                if(v->profile < PROFILE_ADVANCED)
                    idx = vc1_simple_progressive_8x4_zz[i++];
                else
                    idx = vc1_adv_progressive_8x4_zz[i++];
                block[idx + off] = value * scale;
                if(!v->pquantizer)
                    block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;
            }
            if(!(subblkpat & (1 << (1 - j))))
                s->dsp.vc1_inv_trans_8x4(block, j);
        }
        break;
    case TT_4X8:
        for(j = 0; j < 2; j++) {
            last = subblkpat & (1 << (1 - j));
            i = 0;
            off = j * 4;
            while (!last) {
                vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
                i += skip;
                if(i > 31)
                    break;
                if(v->profile < PROFILE_ADVANCED)
                    idx = vc1_simple_progressive_4x8_zz[i++];
                else
                    idx = vc1_adv_progressive_4x8_zz[i++];
                block[idx + off] = value * scale;
                if(!v->pquantizer)
                    block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;
            }
            if(!(subblkpat & (1 << (1 - j))))
                s->dsp.vc1_inv_trans_4x8(block, j);
        }
        break;
    }
    return 0;
}


/** Decode one P-frame MB (in Simple/Main profile)
 */
static int vc1_decode_p_mb(VC1Context *v)
{
    MpegEncContext *s = &v->s;
    GetBitContext *gb = &s->gb;
    int i, j;
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
    int cbp; /* cbp decoding stuff */
    int mqdiff, mquant; /* MB quantization */
    int ttmb = v->ttfrm; /* MB Transform type */
    int status;

    static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },
      offset_table[6] = { 0, 1, 3, 7, 15, 31 };
    int mb_has_coeffs = 1; /* last_flag */
    int dmv_x, dmv_y; /* Differential MV components */
    int index, index1; /* LUT indices */
    int val, sign; /* temp values */
    int first_block = 1;
    int dst_idx, off;
    int skipped, fourmv;

    mquant = v->pq; /* Loosy initialization */

    if (v->mv_type_is_raw)
        fourmv = get_bits1(gb);
    else
        fourmv = v->mv_type_mb_plane[mb_pos];
    if (v->skip_is_raw)
        skipped = get_bits1(gb);
    else
        skipped = v->s.mbskip_table[mb_pos];

    s->dsp.clear_blocks(s->block[0]);

    if (!fourmv) /* 1MV mode */
    {
        if (!skipped)
        {
            GET_MVDATA(dmv_x, dmv_y);

            if (s->mb_intra) {
                s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
                s->current_picture.motion_val[1][s->block_index[0]][1] = 0;
            }
            s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;
            vc1_pred_mv(s, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0]);

            /* FIXME Set DC val for inter block ? */
            if (s->mb_intra && !mb_has_coeffs)
            {
                GET_MQUANT();
                s->ac_pred = get_bits(gb, 1);
                cbp = 0;
            }
            else if (mb_has_coeffs)
            {
                if (s->mb_intra) s->ac_pred = get_bits(gb, 1);
                cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
                GET_MQUANT();
            }
            else
            {
                mquant = v->pq;
                cbp = 0;
            }
            s->current_picture.qscale_table[mb_pos] = mquant;

            if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)
                ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table,
                                VC1_TTMB_VLC_BITS, 2);
            if(!s->mb_intra) vc1_mc_1mv(v, 0);
            dst_idx = 0;
            for (i=0; i<6; i++)
            {
                s->dc_val[0][s->block_index[i]] = 0;
                dst_idx += i >> 2;
                val = ((cbp >> (5 - i)) & 1);
                off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
                v->mb_type[0][s->block_index[i]] = s->mb_intra;
                if(s->mb_intra) {
                    /* check if prediction blocks A and C are available */
                    v->a_avail = v->c_avail = 0;
                    if(i == 2 || i == 3 || !s->first_slice_line)
                        v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
                    if(i == 1 || i == 3 || s->mb_x)
                        v->c_avail = v->mb_type[0][s->block_index[i] - 1];

                    vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);
                    if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;
                    s->dsp.vc1_inv_trans_8x8(s->block[i]);
                    if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;
                    for(j = 0; j < 64; j++) s->block[i][j] += 128;
                    s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
                    if(v->pq >= 9 && v->overlap) {
                        if(v->c_avail)
                            s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
                        if(v->a_avail)
                            s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
                    }
                } else if(val) {
                    vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);
                    if(!v->ttmbf && ttmb < 8) ttmb = -1;
                    first_block = 0;
                    if((i<4) || !(s->flags & CODEC_FLAG_GRAY))
                        s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);
                }
            }
        }
        else //Skipped
        {
            s->mb_intra = 0;
            for(i = 0; i < 6; i++) {
                v->mb_type[0][s->block_index[i]] = 0;
                s->dc_val[0][s->block_index[i]] = 0;
            }
            s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;
            s->current_picture.qscale_table[mb_pos] = 0;
            vc1_pred_mv(s, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0]);
            vc1_mc_1mv(v, 0);
            return 0;
        }
    } //1MV mode
    else //4MV mode
    {
        if (!skipped /* unskipped MB */)
        {
            int intra_count = 0, coded_inter = 0;
            int is_intra[6], is_coded[6];
            /* Get CBPCY */
            cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
            for (i=0; i<6; i++)
            {
                val = ((cbp >> (5 - i)) & 1);
                s->dc_val[0][s->block_index[i]] = 0;
                s->mb_intra = 0;
                if(i < 4) {
                    dmv_x = dmv_y = 0;
                    s->mb_intra = 0;
                    mb_has_coeffs = 0;
                    if(val) {
                        GET_MVDATA(dmv_x, dmv_y);
                    }
                    vc1_pred_mv(s, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0]);
                    if(!s->mb_intra) vc1_mc_4mv_luma(v, i);
                    intra_count += s->mb_intra;
                    is_intra[i] = s->mb_intra;
                    is_coded[i] = mb_has_coeffs;
                }
                if(i&4){
                    is_intra[i] = (intra_count >= 3);
                    is_coded[i] = val;
                }
                if(i == 4) vc1_mc_4mv_chroma(v);
                v->mb_type[0][s->block_index[i]] = is_intra[i];
                if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];
            }
            // if there are no coded blocks then don't do anything more
            if(!intra_count && !coded_inter) return 0;
            dst_idx = 0;
            GET_MQUANT();
            s->current_picture.qscale_table[mb_pos] = mquant;
            /* test if block is intra and has pred */
            {
                int intrapred = 0;
                for(i=0; i<6; i++)
                    if(is_intra[i]) {
                        if(((!s->first_slice_line || (i==2 || i==3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])
                            || ((s->mb_x || (i==1 || i==3)) && v->mb_type[0][s->block_index[i] - 1])) {
                            intrapred = 1;
                            break;
                        }
                    }
                if(intrapred)s->ac_pred = get_bits(gb, 1);
                else s->ac_pred = 0;
            }
            if (!v->ttmbf && coded_inter)
                ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
            for (i=0; i<6; i++)
            {
                dst_idx += i >> 2;
                off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
                s->mb_intra = is_intra[i];
                if (is_intra[i]) {
                    /* check if prediction blocks A and C are available */
                    v->a_avail = v->c_avail = 0;
                    if(i == 2 || i == 3 || !s->first_slice_line)
                        v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
                    if(i == 1 || i == 3 || s->mb_x)
                        v->c_avail = v->mb_type[0][s->block_index[i] - 1];

                    vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);
                    if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;
                    s->dsp.vc1_inv_trans_8x8(s->block[i]);
                    if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;
                    for(j = 0; j < 64; j++) s->block[i][j] += 128;
                    s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);
                    if(v->pq >= 9 && v->overlap) {
                        if(v->c_avail)
                            s->dsp.vc1_h_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
                        if(v->a_avail)
                            s->dsp.vc1_v_overlap(s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
                    }
                } else if(is_coded[i]) {
                    status = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);
                    if(!v->ttmbf && ttmb < 8) ttmb = -1;
                    first_block = 0;
                    if((i<4) || !(s->flags & CODEC_FLAG_GRAY))
                        s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);
                }
            }
            return status;
        }
        else //Skipped MB
        {
            s->mb_intra = 0;
            s->current_picture.qscale_table[mb_pos] = 0;
            for (i=0; i<6; i++) {
                v->mb_type[0][s->block_index[i]] = 0;
                s->dc_val[0][s->block_index[i]] = 0;
            }
            for (i=0; i<4; i++)
            {
                vc1_pred_mv(s, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0]);
                vc1_mc_4mv_luma(v, i);
            }
            vc1_mc_4mv_chroma(v);
            s->current_picture.qscale_table[mb_pos] = 0;
            return 0;
        }
    }

    /* Should never happen */
    return -1;
}

/** Decode one B-frame MB (in Main profile)
 */
static void vc1_decode_b_mb(VC1Context *v)
{
    MpegEncContext *s = &v->s;
    GetBitContext *gb = &s->gb;
    int i, j;
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
    int cbp = 0; /* cbp decoding stuff */
    int mqdiff, mquant; /* MB quantization */
    int ttmb = v->ttfrm; /* MB Transform type */

    static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },
      offset_table[6] = { 0, 1, 3, 7, 15, 31 };
    int mb_has_coeffs = 0; /* last_flag */
    int index, index1; /* LUT indices */
    int val, sign; /* temp values */
    int first_block = 1;
    int dst_idx, off;
    int skipped, direct;
    int dmv_x[2], dmv_y[2];
    int bmvtype = BMV_TYPE_BACKWARD;

    mquant = v->pq; /* Loosy initialization */
    s->mb_intra = 0;

    if (v->dmb_is_raw)
        direct = get_bits1(gb);
    else
        direct = v->direct_mb_plane[mb_pos];
    if (v->skip_is_raw)
        skipped = get_bits1(gb);
    else
        skipped = v->s.mbskip_table[mb_pos];

    s->dsp.clear_blocks(s->block[0]);
    dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;
    for(i = 0; i < 6; i++) {
        v->mb_type[0][s->block_index[i]] = 0;
        s->dc_val[0][s->block_index[i]] = 0;
    }
    s->current_picture.qscale_table[mb_pos] = 0;

    if (!direct) {
        if (!skipped) {
            GET_MVDATA(dmv_x[0], dmv_y[0]);
            dmv_x[1] = dmv_x[0];
            dmv_y[1] = dmv_y[0];
        }
        if(skipped || !s->mb_intra) {
            bmvtype = decode012(gb);
            switch(bmvtype) {
            case 0:
                bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;
                break;
            case 1:
                bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;
                break;
            case 2:
                bmvtype = BMV_TYPE_INTERPOLATED;
                dmv_x[0] = dmv_y[0] = 0;
            }
        }
    }
    for(i = 0; i < 6; i++)
        v->mb_type[0][s->block_index[i]] = s->mb_intra;

    if (skipped) {
        if(direct) bmvtype = BMV_TYPE_INTERPOLATED;
        vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
        vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
        return;
    }
    if (direct) {
        cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
        GET_MQUANT();
        s->mb_intra = 0;
        mb_has_coeffs = 0;
        s->current_picture.qscale_table[mb_pos] = mquant;
        if(!v->ttmbf)
            ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
        dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;
        vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
        vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
    } else {
        if(!mb_has_coeffs && !s->mb_intra) {
            /* no coded blocks - effectively skipped */
            vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
            vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
            return;
        }
        if(s->mb_intra && !mb_has_coeffs) {
            GET_MQUANT();
            s->current_picture.qscale_table[mb_pos] = mquant;
            s->ac_pred = get_bits1(gb);
            cbp = 0;
            vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
        } else {
            if(bmvtype == BMV_TYPE_INTERPOLATED) {
                GET_MVDATA(dmv_x[0], dmv_y[0]);
                if(!mb_has_coeffs) {
                    /* interpolated skipped block */
                    vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
                    vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
                    return;
                }
            }
            vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
            if(!s->mb_intra) {
                vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
            }
            if(s->mb_intra)
                s->ac_pred = get_bits1(gb);
            cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
            GET_MQUANT();
            s->current_picture.qscale_table[mb_pos] = mquant;
            if(!v->ttmbf && !s->mb_intra && mb_has_coeffs)
                ttmb = get_vlc2(gb, vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
        }
    }
    dst_idx = 0;
    for (i=0; i<6; i++)
    {
        s->dc_val[0][s->block_index[i]] = 0;
        dst_idx += i >> 2;
        val = ((cbp >> (5 - i)) & 1);
        off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
        v->mb_type[0][s->block_index[i]] = s->mb_intra;
        if(s->mb_intra) {
            /* check if prediction blocks A and C are available */
            v->a_avail = v->c_avail = 0;
            if(i == 2 || i == 3 || !s->first_slice_line)
                v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
            if(i == 1 || i == 3 || s->mb_x)
                v->c_avail = v->mb_type[0][s->block_index[i] - 1];

            vc1_decode_intra_block(v, s->block[i], i, val, mquant, (i&4)?v->codingset2:v->codingset);
            if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;
            s->dsp.vc1_inv_trans_8x8(s->block[i]);
            if(v->rangeredfrm) for(j = 0; j < 64; j++) s->block[i][j] <<= 1;
            for(j = 0; j < 64; j++) s->block[i][j] += 128;
            s->dsp.put_pixels_clamped(s->block[i], s->dest[dst_idx] + off, s->linesize >> ((i & 4) >> 2));
        } else if(val) {
            vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block);
            if(!v->ttmbf && ttmb < 8) ttmb = -1;
            first_block = 0;
            if((i<4) || !(s->flags & CODEC_FLAG_GRAY))
                s->dsp.add_pixels_clamped(s->block[i], s->dest[dst_idx] + off, (i&4)?s->uvlinesize:s->linesize);
        }
    }
}

/** Decode blocks of I-frame
 */
static void vc1_decode_i_blocks(VC1Context *v)
{
    int k, j;
    MpegEncContext *s = &v->s;
    int cbp, val;
    uint8_t *coded_val;
    int mb_pos;

    /* select codingmode used for VLC tables selection */
    switch(v->y_ac_table_index){
    case 0:
        v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
        break;
    case 1:
        v->codingset = CS_HIGH_MOT_INTRA;
        break;
    case 2:
        v->codingset = CS_MID_RATE_INTRA;
        break;
    }

    switch(v->c_ac_table_index){
    case 0:
        v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
        break;
    case 1:
        v->codingset2 = CS_HIGH_MOT_INTER;
        break;
    case 2:
        v->codingset2 = CS_MID_RATE_INTER;
        break;
    }

    /* Set DC scale - y and c use the same */
    s->y_dc_scale = s->y_dc_scale_table[v->pq];
    s->c_dc_scale = s->c_dc_scale_table[v->pq];

    //do frame decode
    s->mb_x = s->mb_y = 0;
    s->mb_intra = 1;
    s->first_slice_line = 1;
    ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));
    for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {
        for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {
            ff_init_block_index(s);
            ff_update_block_index(s);
            s->dsp.clear_blocks(s->block[0]);
            mb_pos = s->mb_x + s->mb_y * s->mb_width;
            s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;
            s->current_picture.qscale_table[mb_pos] = v->pq;
            s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
            s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

            // do actual MB decoding and displaying
            cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
            v->s.ac_pred = get_bits(&v->s.gb, 1);

            for(k = 0; k < 6; k++) {
                val = ((cbp >> (5 - k)) & 1);

                if (k < 4) {
                    int pred = vc1_coded_block_pred(&v->s, k, &coded_val);
                    val = val ^ pred;
                    *coded_val = val;
                }
                cbp |= val << (5 - k);

                vc1_decode_i_block(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2);

                s->dsp.vc1_inv_trans_8x8(s->block[k]);
                if(v->pq >= 9 && v->overlap) {
                    for(j = 0; j < 64; j++) s->block[k][j] += 128;
                }
            }

            vc1_put_block(v, s->block);
            if(v->pq >= 9 && v->overlap) {
                if(s->mb_x) {
                    s->dsp.vc1_h_overlap(s->dest[0], s->linesize);
                    s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
                    if(!(s->flags & CODEC_FLAG_GRAY)) {
                        s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);
                        s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);
                    }
                }
                s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);
                s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
                if(!s->first_slice_line) {
                    s->dsp.vc1_v_overlap(s->dest[0], s->linesize);
                    s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);
                    if(!(s->flags & CODEC_FLAG_GRAY)) {
                        s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);
                        s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);
                    }
                }
                s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
                s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
            }

            if(get_bits_count(&s->gb) > v->bits) {
                av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);
                return;
            }
        }
        ff_draw_horiz_band(s, s->mb_y * 16, 16);
        s->first_slice_line = 0;
    }
}

/** Decode blocks of I-frame for advanced profile
 */
static void vc1_decode_i_blocks_adv(VC1Context *v)
{
    int k, j;
    MpegEncContext *s = &v->s;
    int cbp, val;
    uint8_t *coded_val;
    int mb_pos;
    int mquant = v->pq;
    int mqdiff;
    int overlap;
    GetBitContext *gb = &s->gb;

    /* select codingmode used for VLC tables selection */
    switch(v->y_ac_table_index){
    case 0:
        v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
        break;
    case 1:
        v->codingset = CS_HIGH_MOT_INTRA;
        break;
    case 2:
        v->codingset = CS_MID_RATE_INTRA;
        break;
    }

    switch(v->c_ac_table_index){
    case 0:
        v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
        break;
    case 1:
        v->codingset2 = CS_HIGH_MOT_INTER;
        break;
    case 2:
        v->codingset2 = CS_MID_RATE_INTER;
        break;
    }

    //do frame decode
    s->mb_x = s->mb_y = 0;
    s->mb_intra = 1;
    s->first_slice_line = 1;
    ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));
    for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {
        for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {
            ff_init_block_index(s);
            ff_update_block_index(s);
            s->dsp.clear_blocks(s->block[0]);
            mb_pos = s->mb_x + s->mb_y * s->mb_stride;
            s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;
            s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
            s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

            // do actual MB decoding and displaying
            cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
            if(v->acpred_is_raw)
                v->s.ac_pred = get_bits(&v->s.gb, 1);
            else
                v->s.ac_pred = v->acpred_plane[mb_pos];

            if(v->condover == CONDOVER_SELECT) {
                if(v->overflg_is_raw)
                    overlap = get_bits(&v->s.gb, 1);
                else
                    overlap = v->over_flags_plane[mb_pos];
            } else
                overlap = (v->condover == CONDOVER_ALL);

            GET_MQUANT();

            s->current_picture.qscale_table[mb_pos] = mquant;
            /* Set DC scale - y and c use the same */
            s->y_dc_scale = s->y_dc_scale_table[mquant];
            s->c_dc_scale = s->c_dc_scale_table[mquant];

            for(k = 0; k < 6; k++) {
                val = ((cbp >> (5 - k)) & 1);

                if (k < 4) {
                    int pred = vc1_coded_block_pred(&v->s, k, &coded_val);
                    val = val ^ pred;
                    *coded_val = val;
                }
                cbp |= val << (5 - k);

                v->a_avail = !s->first_slice_line || (k==2 || k==3);
                v->c_avail = !!s->mb_x || (k==1 || k==3);

                vc1_decode_i_block_adv(v, s->block[k], k, val, (k<4)? v->codingset : v->codingset2, mquant);

                s->dsp.vc1_inv_trans_8x8(s->block[k]);
                for(j = 0; j < 64; j++) s->block[k][j] += 128;
            }

            vc1_put_block(v, s->block);
            if(overlap) {
                if(s->mb_x) {
                    s->dsp.vc1_h_overlap(s->dest[0], s->linesize);
                    s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
                    if(!(s->flags & CODEC_FLAG_GRAY)) {
                        s->dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);
                        s->dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);
                    }
                }
                s->dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);
                s->dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
                if(!s->first_slice_line) {
                    s->dsp.vc1_v_overlap(s->dest[0], s->linesize);
                    s->dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);
                    if(!(s->flags & CODEC_FLAG_GRAY)) {
                        s->dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);
                        s->dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);
                    }
                }
                s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
                s->dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
            }

            if(get_bits_count(&s->gb) > v->bits) {
                av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n", get_bits_count(&s->gb), v->bits);
                return;
            }
        }
        ff_draw_horiz_band(s, s->mb_y * 16, 16);
        s->first_slice_line = 0;
    }
}

static void vc1_decode_p_blocks(VC1Context *v)
{
    MpegEncContext *s = &v->s;

    /* select codingmode used for VLC tables selection */
    switch(v->c_ac_table_index){
    case 0:
        v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
        break;
    case 1:
        v->codingset = CS_HIGH_MOT_INTRA;
        break;
    case 2:
        v->codingset = CS_MID_RATE_INTRA;
        break;
    }

    switch(v->c_ac_table_index){
    case 0:
        v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
        break;
    case 1:
        v->codingset2 = CS_HIGH_MOT_INTER;
        break;
    case 2:
        v->codingset2 = CS_MID_RATE_INTER;
        break;
    }

    ff_er_add_slice(s, 0, 0, s->mb_width - 1, s->mb_height - 1, (AC_END|DC_END|MV_END));
    s->first_slice_line = 1;
    for(s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {
        for(s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {
            ff_init_block_index(s);
            ff_update_block_index(s);
            s->dsp.clear_blocks(s->block[0]);

            vc1_decode_p_mb(v);
            if(get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {
                av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n", get_bits_count(&s->gb), v->bits,s->mb_x,s->mb_y);
                return;
            }
        }
        ff_draw_horiz_band(s, s->mb_y * 16, 16);
        s->first_slice_line = 0;
    }
}

static void vc1_decode_b_blocks(VC1Context *v)
{
    MpegEncContext *s = &v->s;