vc1: Split the decoder in components

Speed up the overall compilation time.

1 files changed, 3054 insertions, 0 deletions

diff --git a/libavcodec/vc1_block.c b/libavcodec/vc1_block.c
new file mode 100644
index 0000000000..acd5145944
--- /dev/null
+++ b/libavcodec/vc1_block.c
@@ -0,0 +1,3054 @@
+/*
+ * VC-1 and WMV3 decoder
+ * Copyright (c) 2011 Mashiat Sarker Shakkhar
+ * Copyright (c) 2006-2007 Konstantin Shishkov
+ * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * VC-1 and WMV3 block decoding routines
+ */
+
+#include "avcodec.h"
+#include "mpegutils.h"
+#include "mpegvideo.h"
+#include "msmpeg4data.h"
+#include "unary.h"
+#include "vc1.h"
+#include "vc1_pred.h"
+#include "vc1acdata.h"
+#include "vc1data.h"
+
+#define MB_INTRA_VLC_BITS 9
+#define DC_VLC_BITS 9
+
+// offset tables for interlaced picture MVDATA decoding
+static const int offset_table1[9] = {  0,  1,  2,  4,  8, 16, 32,  64, 128 };
+static const int offset_table2[9] = {  0,  1,  3,  7, 15, 31, 63, 127, 255 };
+
+/***********************************************************************/
+/**
+ * @name VC-1 Bitplane decoding
+ * @see 8.7, p56
+ * @{
+ */
+
+/**
+ * Imode types
+ * @{
+ */
+enum Imode {
+    IMODE_RAW,
+    IMODE_NORM2,
+    IMODE_DIFF2,
+    IMODE_NORM6,
+    IMODE_DIFF6,
+    IMODE_ROWSKIP,
+    IMODE_COLSKIP
+};
+/** @} */ //imode defines
+
+static void init_block_index(VC1Context *v)
+{
+    MpegEncContext *s = &v->s;
+    ff_init_block_index(s);
+    if (v->field_mode && !(v->second_field ^ v->tff)) {
+        s->dest[0] += s->current_picture_ptr->f->linesize[0];
+        s->dest[1] += s->current_picture_ptr->f->linesize[1];
+        s->dest[2] += s->current_picture_ptr->f->linesize[2];
+    }
+}
+
+/** @} */ //Bitplane group
+
+static void vc1_put_signed_blocks_clamped(VC1Context *v)
+{
+    MpegEncContext *s = &v->s;
+    int topleft_mb_pos, top_mb_pos;
+    int stride_y, fieldtx = 0;
+    int v_dist;
+
+    /* The put pixels loop is always one MB row behind the decoding loop,
+     * because we can only put pixels when overlap filtering is done, and
+     * for filtering of the bottom edge of a MB, we need the next MB row
+     * present as well.
+     * Within the row, the put pixels loop is also one MB col behind the
+     * decoding loop. The reason for this is again, because for filtering
+     * of the right MB edge, we need the next MB present. */
+    if (!s->first_slice_line) {
+        if (s->mb_x) {
+            topleft_mb_pos = (s->mb_y - 1) * s->mb_stride + s->mb_x - 1;
+            if (v->fcm == ILACE_FRAME)
+                fieldtx = v->fieldtx_plane[topleft_mb_pos];
+            stride_y       = s->linesize << fieldtx;
+            v_dist         = (16 - fieldtx) >> (fieldtx == 0);
+            s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][0],
+                                              s->dest[0] - 16 * s->linesize - 16,
+                                              stride_y);
+            s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][1],
+                                              s->dest[0] - 16 * s->linesize - 8,
+                                              stride_y);
+            s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][2],
+                                              s->dest[0] - v_dist * s->linesize - 16,
+                                              stride_y);
+            s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][3],
+                                              s->dest[0] - v_dist * s->linesize - 8,
+                                              stride_y);
+            s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][4],
+                                              s->dest[1] - 8 * s->uvlinesize - 8,
+                                              s->uvlinesize);
+            s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][5],
+                                              s->dest[2] - 8 * s->uvlinesize - 8,
+                                              s->uvlinesize);
+        }
+        if (s->mb_x == s->mb_width - 1) {
+            top_mb_pos = (s->mb_y - 1) * s->mb_stride + s->mb_x;
+            if (v->fcm == ILACE_FRAME)
+                fieldtx = v->fieldtx_plane[top_mb_pos];
+            stride_y   = s->linesize << fieldtx;
+            v_dist     = fieldtx ? 15 : 8;
+            s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][0],
+                                              s->dest[0] - 16 * s->linesize,
+                                              stride_y);
+            s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][1],
+                                              s->dest[0] - 16 * s->linesize + 8,
+                                              stride_y);
+            s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][2],
+                                              s->dest[0] - v_dist * s->linesize,
+                                              stride_y);
+            s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][3],
+                                              s->dest[0] - v_dist * s->linesize + 8,
+                                              stride_y);
+            s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][4],
+                                              s->dest[1] - 8 * s->uvlinesize,
+                                              s->uvlinesize);
+            s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][5],
+                                              s->dest[2] - 8 * s->uvlinesize,
+                                              s->uvlinesize);
+        }
+    }
+
+#define inc_blk_idx(idx) do { \
+        idx++; \
+        if (idx >= v->n_allocated_blks) \
+            idx = 0; \
+    } while (0)
+
+    inc_blk_idx(v->topleft_blk_idx);
+    inc_blk_idx(v->top_blk_idx);
+    inc_blk_idx(v->left_blk_idx);
+    inc_blk_idx(v->cur_blk_idx);
+}
+
+/***********************************************************************/
+/**
+ * @name VC-1 Block-level functions
+ * @see 7.1.4, p91 and 8.1.1.7, p(1)04
+ * @{
+ */
+
+/**
+ * @def GET_MQUANT
+ * @brief Get macroblock-level quantizer scale
+ */
+#define GET_MQUANT()                                           \
+    if (v->dquantfrm) {                                        \
+        int edges = 0;                                         \
+        if (v->dqprofile == DQPROFILE_ALL_MBS) {               \
+            if (v->dqbilevel) {                                \
+                mquant = (get_bits1(gb)) ? v->altpq : v->pq;   \
+            } else {                                           \
+                mqdiff = get_bits(gb, 3);                      \
+                if (mqdiff != 7)                               \
+                    mquant = v->pq + mqdiff;                   \
+                else                                           \
+                    mquant = get_bits(gb, 5);                  \
+            }                                                  \
+        }                                                      \
+        if (v->dqprofile == DQPROFILE_SINGLE_EDGE)             \
+            edges = 1 << v->dqsbedge;                          \
+        else if (v->dqprofile == DQPROFILE_DOUBLE_EDGES)       \
+            edges = (3 << v->dqsbedge) % 15;                   \
+        else if (v->dqprofile == DQPROFILE_FOUR_EDGES)         \
+            edges = 15;                                        \
+        if ((edges&1) && !s->mb_x)                             \
+            mquant = v->altpq;                                 \
+        if ((edges&2) && s->first_slice_line)                  \
+            mquant = v->altpq;                                 \
+        if ((edges&4) && s->mb_x == (s->mb_width - 1))         \
+            mquant = v->altpq;                                 \
+        if ((edges&8) && s->mb_y == (s->mb_height - 1))        \
+            mquant = v->altpq;                                 \
+        if (!mquant || mquant > 31) {                          \
+            av_log(v->s.avctx, AV_LOG_ERROR,                   \
+                   "Overriding invalid mquant %d\n", mquant);  \
+            mquant = 1;                                        \
+        }                                                      \
+    }
+
+/**
+ * @def GET_MVDATA(_dmv_x, _dmv_y)
+ * @brief Get MV differentials
+ * @see MVDATA decoding from 8.3.5.2, p(1)20
+ * @param _dmv_x Horizontal differential for decoded MV
+ * @param _dmv_y Vertical differential for decoded MV
+ */
+#define GET_MVDATA(_dmv_x, _dmv_y)                                      \
+    index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table, \
+                         VC1_MV_DIFF_VLC_BITS, 2);                      \
+    if (index > 36) {                                                   \
+        mb_has_coeffs = 1;                                              \
+        index -= 37;                                                    \
+    } else                                                              \
+        mb_has_coeffs = 0;                                              \
+    s->mb_intra = 0;                                                    \
+    if (!index) {                                                       \
+        _dmv_x = _dmv_y = 0;                                            \
+    } else if (index == 35) {                                           \
+        _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \
+        _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \
+    } else if (index == 36) {                                           \
+        _dmv_x = 0;                                                     \
+        _dmv_y = 0;                                                     \
+        s->mb_intra = 1;                                                \
+    } else {                                                            \
+        index1 = index % 6;                                             \
+        if (!s->quarter_sample && index1 == 5) val = 1;                 \
+        else                                   val = 0;                 \
+        if (size_table[index1] - val > 0)                               \
+            val = get_bits(gb, size_table[index1] - val);               \
+        else                                   val = 0;                 \
+        sign = 0 - (val&1);                                             \
+        _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \
+                                                                        \
+        index1 = index / 6;                                             \
+        if (!s->quarter_sample && index1 == 5) val = 1;                 \
+        else                                   val = 0;                 \
+        if (size_table[index1] - val > 0)                               \
+            val = get_bits(gb, size_table[index1] - val);               \
+        else                                   val = 0;                 \
+        sign = 0 - (val & 1);                                           \
+        _dmv_y = (sign ^ ((val >> 1) + offset_table[index1])) - sign;   \
+    }
+
+static av_always_inline void get_mvdata_interlaced(VC1Context *v, int *dmv_x,
+                                                   int *dmv_y, int *pred_flag)
+{
+    int index, index1;
+    int extend_x = 0, extend_y = 0;
+    GetBitContext *gb = &v->s.gb;
+    int bits, esc;
+    int val, sign;
+    const int* offs_tab;
+
+    if (v->numref) {
+        bits = VC1_2REF_MVDATA_VLC_BITS;
+        esc  = 125;
+    } else {
+        bits = VC1_1REF_MVDATA_VLC_BITS;
+        esc  = 71;
+    }
+    switch (v->dmvrange) {
+    case 1:
+        extend_x = 1;
+        break;
+    case 2:
+        extend_y = 1;
+        break;
+    case 3:
+        extend_x = extend_y = 1;
+        break;
+    }
+    index = get_vlc2(gb, v->imv_vlc->table, bits, 3);
+    if (index == esc) {
+        *dmv_x = get_bits(gb, v->k_x);
+        *dmv_y = get_bits(gb, v->k_y);
+        if (v->numref) {
+            if (pred_flag) {
+                *pred_flag = *dmv_y & 1;
+                *dmv_y     = (*dmv_y + *pred_flag) >> 1;
+            } else {
+                *dmv_y     = (*dmv_y + (*dmv_y & 1)) >> 1;
+            }
+        }
+    }
+    else {
+        if (extend_x)
+            offs_tab = offset_table2;
+        else
+            offs_tab = offset_table1;
+        index1 = (index + 1) % 9;
+        if (index1 != 0) {
+            val    = get_bits(gb, index1 + extend_x);
+            sign   = 0 -(val & 1);
+            *dmv_x = (sign ^ ((val >> 1) + offs_tab[index1])) - sign;
+        } else
+            *dmv_x = 0;
+        if (extend_y)
+            offs_tab = offset_table2;
+        else
+            offs_tab = offset_table1;
+        index1 = (index + 1) / 9;
+        if (index1 > v->numref) {
+            val    = get_bits(gb, (index1 + (extend_y << v->numref)) >> v->numref);
+            sign   = 0 - (val & 1);
+            *dmv_y = (sign ^ ((val >> 1) + offs_tab[index1 >> v->numref])) - sign;
+        } else
+            *dmv_y = 0;
+        if (v->numref && pred_flag)
+            *pred_flag = index1 & 1;
+    }
+}
+
+/** Reconstruct motion vector for B-frame and do motion compensation
+ */
+static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2],
+                            int direct, int mode)
+{
+    if (direct) {
+        ff_vc1_mc_1mv(v, 0);
+        ff_vc1_interp_mc(v);
+        return;
+    }
+    if (mode == BMV_TYPE_INTERPOLATED) {
+        ff_vc1_mc_1mv(v, 0);
+        ff_vc1_interp_mc(v);
+        return;
+    }
+
+    ff_vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));
+}
+
+/** Get predicted DC value for I-frames only
+ * prediction dir: left=0, top=1
+ * @param s MpegEncContext
+ * @param overlap flag indicating that overlap filtering is used
+ * @param pq integer part of picture quantizer
+ * @param[in] n block index in the current MB
+ * @param dc_val_ptr Pointer to DC predictor
+ * @param dir_ptr Prediction direction for use in AC prediction
+ */
+static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,
+                                int16_t **dc_val_ptr, int *dir_ptr)
+{
+    int a, b, c, wrap, pred, scale;
+    int16_t *dc_val;
+    static const uint16_t dcpred[32] = {
+        -1, 1024,  512,  341,  256,  205,  171,  146,  128,
+             114,  102,   93,   85,   79,   73,   68,   64,
+              60,   57,   54,   51,   49,   47,   45,   43,
+              41,   39,   38,   37,   35,   34,   33
+    };
+
+    /* find prediction - wmv3_dc_scale always used here in fact */
+    if (n < 4) scale = s->y_dc_scale;
+    else       scale = s->c_dc_scale;
+
+    wrap   = s->block_wrap[n];
+    dc_val = s->dc_val[0] + s->block_index[n];
+
+    /* B A
+     * C X
+     */
+    c = dc_val[ - 1];
+    b = dc_val[ - 1 - wrap];
+    a = dc_val[ - wrap];
+
+    if (pq < 9 || !overlap) {
+        /* Set outer values */
+        if (s->first_slice_line && (n != 2 && n != 3))
+            b = a = dcpred[scale];
+        if (s->mb_x == 0 && (n != 1 && n != 3))
+            b = c = dcpred[scale];
+    } else {
+        /* Set outer values */
+        if (s->first_slice_line && (n != 2 && n != 3))
+            b = a = 0;
+        if (s->mb_x == 0 && (n != 1 && n != 3))
+            b = c = 0;
+    }
+
+    if (abs(a - b) <= abs(b - c)) {
+        pred     = c;
+        *dir_ptr = 1; // left
+    } else {
+        pred     = a;
+        *dir_ptr = 0; // top
+    }
+
+    /* update predictor */
+    *dc_val_ptr = &dc_val[0];
+    return pred;
+}
+
+
+/** Get predicted DC value
+ * prediction dir: left=0, top=1
+ * @param s MpegEncContext
+ * @param overlap flag indicating that overlap filtering is used
+ * @param pq integer part of picture quantizer
+ * @param[in] n block index in the current MB
+ * @param a_avail flag indicating top block availability
+ * @param c_avail flag indicating left block availability
+ * @param dc_val_ptr Pointer to DC predictor
+ * @param dir_ptr Prediction direction for use in AC prediction
+ */
+static inline int ff_vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,
+                              int a_avail, int c_avail,
+                              int16_t **dc_val_ptr, int *dir_ptr)
+{
+    int a, b, c, wrap, pred;
+    int16_t *dc_val;
+    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
+    int q1, q2 = 0;
+    int dqscale_index;
+
+    wrap = s->block_wrap[n];
+    dc_val = s->dc_val[0] + s->block_index[n];
+
+    /* B A
+     * C X
+     */
+    c = dc_val[ - 1];
+    b = dc_val[ - 1 - wrap];
+    a = dc_val[ - wrap];
+    /* scale predictors if needed */
+    q1 = s->current_picture.qscale_table[mb_pos];
+    dqscale_index = s->y_dc_scale_table[q1] - 1;
+    if (dqscale_index < 0)
+        return 0;
+    if (c_avail && (n != 1 && n != 3)) {
+        q2 = s->current_picture.qscale_table[mb_pos - 1];
+        if (q2 && q2 != q1)
+            c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
+    }
+    if (a_avail && (n != 2 && n != 3)) {
+        q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
+        if (q2 && q2 != q1)
+            a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
+    }
+    if (a_avail && c_avail && (n != 3)) {
+        int off = mb_pos;
+        if (n != 1)
+            off--;
+        if (n != 2)
+            off -= s->mb_stride;
+        q2 = s->current_picture.qscale_table[off];
+        if (q2 && q2 != q1)
+            b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
+    }
+
+    if (a_avail && c_avail) {
+        if (abs(a - b) <= abs(b - c)) {
+            pred     = c;
+            *dir_ptr = 1; // left
+        } else {
+            pred     = a;
+            *dir_ptr = 0; // top
+        }
+    } else if (a_avail) {
+        pred     = a;
+        *dir_ptr = 0; // top
+    } else if (c_avail) {
+        pred     = c;
+        *dir_ptr = 1; // left
+    } else {
+        pred     = 0;
+        *dir_ptr = 1; // left
+    }
+
+    /* update predictor */
+    *dc_val_ptr = &dc_val[0];
+    return pred;
+}
+
+/** @} */ // Block group
+
+/**
+ * @name VC1 Macroblock-level functions in Simple/Main Profiles
+ * @see 7.1.4, p91 and 8.1.1.7, p(1)04
+ * @{
+ */
+
+static inline int vc1_coded_block_pred(MpegEncContext * s, int n,
+                                       uint8_t **coded_block_ptr)
+{
+    int xy, wrap, pred, a, b, c;
+
+    xy   = s->block_index[n];
+    wrap = s->b8_stride;
+
+    /* B C
+     * A X
+     */
+    a = s->coded_block[xy - 1       ];
+    b = s->coded_block[xy - 1 - wrap];
+    c = s->coded_block[xy     - wrap];
+
+    if (b == c) {
+        pred = a;
+    } else {
+        pred = c;
+    }
+
+    /* store value */
+    *coded_block_ptr = &s->coded_block[xy];
+
+    return pred;
+}
+
+/**
+ * Decode one AC coefficient
+ * @param v The VC1 context
+ * @param last Last coefficient
+ * @param skip How much zero coefficients to skip
+ * @param value Decoded AC coefficient value
+ * @param codingset set of VLC to decode data
+ * @see 8.1.3.4
+ */
+static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip,
+                                int *value, int codingset)
+{
+    GetBitContext *gb = &v->s.gb;
+    int index, escape, run = 0, level = 0, lst = 0;
+
+    index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);
+    if (index != ff_vc1_ac_sizes[codingset] - 1) {
+        run   = vc1_index_decode_table[codingset][index][0];
+        level = vc1_index_decode_table[codingset][index][1];
+        lst   = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;
+        if (get_bits1(gb))
+            level = -level;
+    } else {
+        escape = decode210(gb);
+        if (escape != 2) {
+            index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);
+            run   = vc1_index_decode_table[codingset][index][0];
+            level = vc1_index_decode_table[codingset][index][1];
+            lst   = index >= vc1_last_decode_table[codingset];
+            if (escape == 0) {
+                if (lst)
+                    level += vc1_last_delta_level_table[codingset][run];
+                else
+                    level += vc1_delta_level_table[codingset][run];
+            } else {
+                if (lst)
+                    run += vc1_last_delta_run_table[codingset][level] + 1;
+                else
+                    run += vc1_delta_run_table[codingset][level] + 1;
+            }
+            if (get_bits1(gb))
+                level = -level;
+        } else {
+            int sign;
+            lst = get_bits1(gb);
+            if (v->s.esc3_level_length == 0) {
+                if (v->pq < 8 || v->dquantfrm) { // table 59
+                    v->s.esc3_level_length = get_bits(gb, 3);
+                    if (!v->s.esc3_level_length)
+                        v->s.esc3_level_length = get_bits(gb, 2) + 8;
+                } else { // table 60
+                    v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;
+                }
+                v->s.esc3_run_length = 3 + get_bits(gb, 2);
+            }
+            run   = get_bits(gb, v->s.esc3_run_length);
+            sign  = get_bits1(gb);
+            level = get_bits(gb, v->s.esc3_level_length);
+            if (sign)
+                level = -level;
+        }
+    }
+
+    *last  = lst;
+    *skip  = run;
+    *value = level;
+}
+
+/** Decode intra block in intra frames - should be faster than decode_intra_block
+ * @param v VC1Context
+ * @param block block to decode
+ * @param[in] n subblock index
+ * @param coded are AC coeffs present or not
+ * @param codingset set of VLC to decode data
+ */
+static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,
+                              int coded, int codingset)
+{
+    GetBitContext *gb = &v->s.gb;
+    MpegEncContext *s = &v->s;
+    int dc_pred_dir = 0; /* Direction of the DC prediction used */
+    int i;
+    int16_t *dc_val;
+    int16_t *ac_val, *ac_val2;
+    int dcdiff;
+
+    /* 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 (v->pq == 1)      dcdiff = get_bits(gb, 10);
+            else if (v->pq == 2) dcdiff = get_bits(gb, 9);
+            else                 dcdiff = get_bits(gb, 8);
+        } else {
+            if (v->pq == 1)
+                dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;
+            else if (v->pq == 2)
+                dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;
+        }
+        if (get_bits1(gb))
+            dcdiff = -dcdiff;
+    }
+
+    /* Prediction */
+    dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &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 ? */
+    if (!coded) {
+        goto not_coded;
+    }
+
+    // AC Decoding
+    i = 1;
+
+    {
+        int last = 0, skip, value;
+        const uint8_t *zz_table;
+        int scale;
+        int k;
+
+        scale = v->pq * 2 + v->halfpq;
+
+        if (v->s.ac_pred) {
+            if (!dc_pred_dir)
+                zz_table = v->zz_8x8[2];
+            else
+                zz_table = v->zz_8x8[3];
+        } else
+            zz_table = v->zz_8x8[1];
+
+        ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;
+        ac_val2 = ac_val;
+        if (dc_pred_dir) // left
+            ac_val -= 16;
+        else // top
+            ac_val -= 16 * s->block_wrap[n];
+
+        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 (s->ac_pred) {
+            if (dc_pred_dir) { // left
+                for (k = 1; k < 8; k++)
+                    block[k << v->left_blk_sh] += ac_val[k];
+            } else { // top
+                for (k = 1; k < 8; k++)
+                    block[k << v->top_blk_sh] += ac_val[k + 8];
+            }
+        }
+        /* save AC coeffs for further prediction */
+        for (k = 1; k < 8; k++) {
+            ac_val2[k]     = block[k << v->left_blk_sh];
+            ac_val2[k + 8] = block[k << v->top_blk_sh];
+        }
+
+        /* scale AC coeffs */
+        for (k = 1; k < 64; k++)
+            if (block[k]) {
+                block[k] *= scale;
+                if (!v->pquantizer)
+                    block[k] += (block[k] < 0) ? -v->pq : v->pq;
+            }
+
+        if (s->ac_pred) i = 63;
+    }
+
+not_coded:
+    if (!coded) {
+        int k, scale;
+        ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;
+        ac_val2 = ac_val;
+
+        i = 0;
+        scale = v->pq * 2 + v->halfpq;
+        memset(ac_val2, 0, 16 * 2);
+        if (dc_pred_dir) { // left
+            ac_val -= 16;
+            if (s->ac_pred)
+                memcpy(ac_val2, ac_val, 8 * 2);
+        } else { // top
+            ac_val -= 16 * s->block_wrap[n];
+            if (s->ac_pred)
+                memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);
+        }
+
+        /* apply AC prediction if needed */
+        if (s->ac_pred) {
+            if (dc_pred_dir) { //left
+                for (k = 1; k < 8; k++) {
+                    block[k << v->left_blk_sh] = ac_val[k] * scale;
+                    if (!v->pquantizer && block[k << v->left_blk_sh])
+                        block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -v->pq : v->pq;
+                }
+            } else { // top
+                for (k = 1; k < 8; k++) {
+                    block[k << v->top_blk_sh] = ac_val[k + 8] * scale;
+                    if (!v->pquantizer && block[k << v->top_blk_sh])
+                        block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -v->pq : v->pq;
+                }
+            }
+            i = 63;
+        }
+    }
+    s->block_last_index[n] = i;
+
+    return 0;
+}
+
+/** Decode intra block in intra frames - should be faster than decode_intra_block
+ * @param v VC1Context
+ * @param block block to decode
+ * @param[in] n subblock number
+ * @param coded are AC coeffs present or not
+ * @param codingset set of VLC to decode data
+ * @param mquant quantizer value for this macroblock
+ */
+static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
+                                  int coded, int codingset, int mquant)
+{
+    GetBitContext *gb = &v->s.gb;
+    MpegEncContext *s = &v->s;
+    int dc_pred_dir = 0; /* Direction of the DC prediction used */
+    int i;
+    int16_t *dc_val;
+    int16_t *ac_val, *ac_val2;
+    int dcdiff;
+    int a_avail = v->a_avail, c_avail = v->c_avail;
+    int use_pred = s->ac_pred;
+    int scale;
+    int q1, q2 = 0;
+    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
+
+    /* 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_bits1(gb)   - 1;
+        }
+        if (get_bits1(gb))
+            dcdiff = -dcdiff;
+    }
+
+    /* Prediction */
+    dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->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;
+    }
+
+    //AC Decoding
+    i = 1;
+
+    /* check if AC is needed at all */
+    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 + ((mquant == v->pq) ? v->halfpq : 0);
+
+    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 ( dc_pred_dir && n == 1)
+        q2 = q1;
+    if (!dc_pred_dir && n == 2)
+        q2 = q1;
+    if (n == 3)
+        q2 = q1;
+
+    if (coded) {
+        int last = 0, skip, value;
+        const uint8_t *zz_table;
+        int k;
+
+        if (v->s.ac_pred) {
+            if (!use_pred && v->fcm == ILACE_FRAME) {
+                zz_table = v->zzi_8x8;
+            } else {
+                if (!dc_pred_dir) // top
+                    zz_table = v->zz_8x8[2];
+                else // left
+                    zz_table = v->zz_8x8[3];
+            }
+        } else {
+            if (v->fcm != ILACE_FRAME)
+                zz_table = v->zz_8x8[1];
+            else
+                zz_table = v->zzi_8x8;
+        }
+
+        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 (q1 < 1)
+                    return AVERROR_INVALIDDATA;
+                if (dc_pred_dir) { // left
+                    for (k = 1; k < 8; k++)
+                        block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
+                } else { // top
+                    for (k = 1; k < 8; k++)
+                        block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
+                }
+            } else {
+                if (dc_pred_dir) { //left
+                    for (k = 1; k < 8; k++)
+                        block[k << v->left_blk_sh] += ac_val[k];
+                } else { //top
+                    for (k = 1; k < 8; k++)
+                        block[k << v->top_blk_sh] += ac_val[k + 8];
+                }
+            }
+        }
+        /* save AC coeffs for further prediction */
+        for (k = 1; k < 8; k++) {
+            ac_val2[k    ] = block[k << v->left_blk_sh];
+            ac_val2[k + 8] = block[k << v->top_blk_sh];
+        }
+
+        /* 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;
+                    if (q1 < 1)
+                        return AVERROR_INVALIDDATA;
+                    for (k = 1; k < 8; k++)
+                        ac_val2[k] = (ac_val2[k] * q2 * ff_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;
+                    if (q1 < 1)
+                        return AVERROR_INVALIDDATA;
+                    for (k = 1; k < 8; k++)
+                        ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_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 << v->left_blk_sh] = ac_val2[k] * scale;
+                    if (!v->pquantizer && block[k << v->left_blk_sh])
+                        block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;
+                }
+            } else { // top
+                for (k = 1; k < 8; k++) {
+                    block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;
+                    if (!v->pquantizer && block[k << v->top_blk_sh])
+                        block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;
+                }
+            }
+            i = 63;
+        }
+    }
+    s->block_last_index[n] = i;
+
+    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[in] n subblock index
+ * @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, int16_t 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 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;
+
+    s->bdsp.clear_block(block);
+
+    /* 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_bits1(gb)   - 1;
+        }
+        if (get_bits1(gb))
+            dcdiff = -dcdiff;
+    }
+
+    /* Prediction */
+    dcdiff += ff_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;
+    }
+
+    //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 ( dc_pred_dir && n == 1)
+        q2 = q1;
+    if (!dc_pred_dir && n == 2)
+        q2 = q1;
+    if (n == 3) q2 = q1;
+
+    if (coded) {
+        int last = 0, skip, value;
+        int k;
+
+        while (!last) {
+            vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
+            i += skip;
+            if (i > 63)
+                break;
+            if (v->fcm == PROGRESSIVE)
+                block[v->zz_8x8[0][i++]] = value;
+            else {
+                if (use_pred && (v->fcm == ILACE_FRAME)) {
+                    if (!dc_pred_dir) // top
+                        block[v->zz_8x8[2][i++]] = value;
+                    else // left
+                        block[v->zz_8x8[3][i++]] = value;
+                } else {
+                    block[v->zzi_8x8[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 (q1 < 1)
+                    return AVERROR_INVALIDDATA;
+                if (dc_pred_dir) { // left
+                    for (k = 1; k < 8; k++)
+                        block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
+                } else { //top
+                    for (k = 1; k < 8; k++)
+                        block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
+                }
+            } else {
+                if (dc_pred_dir) { // left
+                    for (k = 1; k < 8; k++)
+                        block[k << v->left_blk_sh] += ac_val[k];
+                } else { // top
+                    for (k = 1; k < 8; k++)
+                        block[k << v->top_blk_sh] += ac_val[k + 8];
+                }
+            }
+        }
+        /* save AC coeffs for further prediction */
+        for (k = 1; k < 8; k++) {
+            ac_val2[k    ] = block[k << v->left_blk_sh];
+            ac_val2[k + 8] = block[k << v->top_blk_sh];
+        }
+
+        /* 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;
+                    if (q1 < 1)
+                        return AVERROR_INVALIDDATA;
+                    for (k = 1; k < 8; k++)
+                        ac_val2[k] = (ac_val2[k] * q2 * ff_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;
+                    if (q1 < 1)
+                        return AVERROR_INVALIDDATA;
+                    for (k = 1; k < 8; k++)
+                        ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_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 << v->left_blk_sh] = ac_val2[k] * scale;
+                    if (!v->pquantizer && block[k << v->left_blk_sh])
+                        block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;
+                }
+            } else { // top
+                for (k = 1; k < 8; k++) {
+                    block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;
+                    if (!v->pquantizer && block[k << v->top_blk_sh])
+                        block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;
+                }
+            }
+            i = 63;
+        }
+    }
+    s->block_last_index[n] = i;
+
+    return 0;
+}
+
+/** Decode P block
+ */
+static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,
+                              int mquant, int ttmb, int first_block,
+                              uint8_t *dst, int linesize, int skip_block,
+                              int *ttmb_out)
+{
+    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;
+    int pat = 0;
+
+    s->bdsp.clear_block(block);
+
+    if (ttmb == -1) {
+        ttblk = ff_vc1_ttblk_to_tt[v->tt_index][get_vlc2(gb, ff_vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];
+    }
+    if (ttblk == TT_4X4) {
+        subblkpat = ~(get_vlc2(gb, ff_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))
+            || (!v->res_rtm_flag && !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->pq == mquant) ? v->halfpq : 0);
+
+    // 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:
+        pat  = 0xF;
+        i    = 0;
+        last = 0;
+        while (!last) {
+            vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
+            i += skip;
+            if (i > 63)
+                break;
+            if (!v->fcm)
+                idx = v->zz_8x8[0][i++];
+            else
+                idx = v->zzi_8x8[i++];
+            block[idx] = value * scale;
+            if (!v->pquantizer)
+                block[idx] += (block[idx] < 0) ? -mquant : mquant;
+        }
+        if (!skip_block) {
+            if (i == 1)
+                v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);
+            else {
+                v->vc1dsp.vc1_inv_trans_8x8(block);
+                s->idsp.add_pixels_clamped(block, dst, linesize);
+            }
+        }
+        break;
+    case TT_4X4:
+        pat = ~subblkpat & 0xF;
+        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;
+                if (!v->fcm)
+                    idx = ff_vc1_simple_progressive_4x4_zz[i++];
+                else
+                    idx = ff_vc1_adv_interlaced_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))) && !skip_block) {
+                if (i == 1)
+                    v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);
+                else
+                    v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);
+            }
+        }
+        break;
+    case TT_8X4:
+        pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;
+        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->fcm)
+                    idx = v->zz_8x4[i++] + off;
+                else
+                    idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;
+                block[idx] = value * scale;
+                if (!v->pquantizer)
+                    block[idx] += (block[idx] < 0) ? -mquant : mquant;
+            }
+            if (!(subblkpat & (1 << (1 - j))) && !skip_block) {
+                if (i == 1)
+                    v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);
+                else
+                    v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);
+            }
+        }
+        break;
+    case TT_4X8:
+        pat = ~(subblkpat * 5) & 0xF;
+        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->fcm)
+                    idx = v->zz_4x8[i++] + off;
+                else
+                    idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;
+                block[idx] = value * scale;
+                if (!v->pquantizer)
+                    block[idx] += (block[idx] < 0) ? -mquant : mquant;
+            }
+            if (!(subblkpat & (1 << (1 - j))) && !skip_block) {
+                if (i == 1)
+                    v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);
+                else
+                    v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);
+            }
+        }
+        break;
+    }
+    if (ttmb_out)
+        *ttmb_out |= ttblk << (n * 4);
+    return pat;
+}
+
+/** @} */ // Macroblock group
+
+static const int size_table  [6] = { 0, 2, 3, 4,  5,  8 };
+static const int offset_table[6] = { 0, 1, 3, 7, 15, 31 };
+
+/** Decode one P-frame MB
+ */
+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 mb_has_coeffs = 1; /* last_flag */
+    int dmv_x, dmv_y; /* Differential MV components */
+    int index, index1; /* LUT indexes */
+    int val, sign; /* temp values */
+    int first_block = 1;
+    int dst_idx, off;
+    int skipped, fourmv;
+    int block_cbp = 0, pat, block_tt = 0, block_intra = 0;
+
+    mquant = v->pq; /* lossy 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];
+
+    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;
+            ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);
+
+            /* FIXME Set DC val for inter block ? */
+            if (s->mb_intra && !mb_has_coeffs) {
+                GET_MQUANT();
+                s->ac_pred = get_bits1(gb);
+                cbp        = 0;
+            } else if (mb_has_coeffs) {
+                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();
+            } 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, ff_vc1_ttmb_vlc[v->tt_index].table,
+                                VC1_TTMB_VLC_BITS, 2);
+            if (!s->mb_intra) ff_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;
+                    v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
+                    if (v->rangeredfrm)
+                        for (j = 0; j < 64; j++)
+                            s->block[i][j] <<= 1;
+                    s->idsp.put_signed_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)
+                            v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);
+                        if (v->a_avail)
+                            v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);
+                    }
+                    block_cbp   |= 0xF << (i << 2);
+                    block_intra |= 1 << i;
+                } else if (val) {
+                    pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block,
+                                             s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,
+                                             (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);
+                    block_cbp |= pat << (i << 2);
+                    if (!v->ttmbf && ttmb < 8)
+                        ttmb = -1;
+                    first_block = 0;
+                }
+            }
+        } 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;
+            ff_vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);
+            ff_vc1_mc_1mv(v, 0);
+        }
+    } 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);
+                    }
+                    ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);
+                    if (!s->mb_intra)
+                        ff_vc1_mc_4mv_luma(v, i, 0, 0);
+                    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)
+                    ff_vc1_mc_4mv_chroma(v, 0);
+                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
+            dst_idx = 0;
+            if (!intra_count && !coded_inter)
+                goto end;
+            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_bits1(gb);
+                else
+                    s->ac_pred = 0;
+            }
+            if (!v->ttmbf && coded_inter)
+                ttmb = get_vlc2(gb, ff_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;
+                    v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
+                    if (v->rangeredfrm)
+                        for (j = 0; j < 64; j++)
+                            s->block[i][j] <<= 1;
+                    s->idsp.put_signed_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)
+                            v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);
+                        if (v->a_avail)
+                            v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);
+                    }
+                    block_cbp   |= 0xF << (i << 2);
+                    block_intra |= 1 << i;
+                } else if (is_coded[i]) {
+                    pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
+                                             first_block, s->dest[dst_idx] + off,
+                                             (i & 4) ? s->uvlinesize : s->linesize,
+                                             (i & 4) && (s->flags & CODEC_FLAG_GRAY),
+                                             &block_tt);
+                    block_cbp |= pat << (i << 2);
+                    if (!v->ttmbf && ttmb < 8)
+                        ttmb = -1;
+                    first_block = 0;
+                }
+            }
+        } 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++) {
+                ff_vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);
+                ff_vc1_mc_4mv_luma(v, i, 0, 0);
+            }
+            ff_vc1_mc_4mv_chroma(v, 0);
+            s->current_picture.qscale_table[mb_pos] = 0;
+        }
+    }
+end:
+    v->cbp[s->mb_x]      = block_cbp;
+    v->ttblk[s->mb_x]    = block_tt;
+    v->is_intra[s->mb_x] = block_intra;
+
+    return 0;
+}
+
+/* Decode one macroblock in an interlaced frame p picture */
+
+static int vc1_decode_p_mb_intfr(VC1Context *v)
+{
+    MpegEncContext *s = &v->s;
+    GetBitContext *gb = &s->gb;
+    int i;
+    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 */
+
+    int mb_has_coeffs = 1; /* last_flag */
+    int dmv_x, dmv_y; /* Differential MV components */
+    int val; /* temp value */
+    int first_block = 1;
+    int dst_idx, off;
+    int skipped, fourmv = 0, twomv = 0;
+    int block_cbp = 0, pat, block_tt = 0;
+    int idx_mbmode = 0, mvbp;
+    int stride_y, fieldtx;
+
+    mquant = v->pq; /* Loosy initialization */
+
+    if (v->skip_is_raw)
+        skipped = get_bits1(gb);
+    else
+        skipped = v->s.mbskip_table[mb_pos];
+    if (!skipped) {
+        if (v->fourmvswitch)
+            idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done
+        else
+            idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line
+        switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {
+        /* store the motion vector type in a flag (useful later) */
+        case MV_PMODE_INTFR_4MV:
+            fourmv = 1;
+            v->blk_mv_type[s->block_index[0]] = 0;
+            v->blk_mv_type[s->block_index[1]] = 0;
+            v->blk_mv_type[s->block_index[2]] = 0;
+            v->blk_mv_type[s->block_index[3]] = 0;
+            break;
+        case MV_PMODE_INTFR_4MV_FIELD:
+            fourmv = 1;
+            v->blk_mv_type[s->block_index[0]] = 1;
+            v->blk_mv_type[s->block_index[1]] = 1;
+            v->blk_mv_type[s->block_index[2]] = 1;
+            v->blk_mv_type[s->block_index[3]] = 1;
+            break;
+        case MV_PMODE_INTFR_2MV_FIELD:
+            twomv = 1;
+            v->blk_mv_type[s->block_index[0]] = 1;
+            v->blk_mv_type[s->block_index[1]] = 1;
+            v->blk_mv_type[s->block_index[2]] = 1;
+            v->blk_mv_type[s->block_index[3]] = 1;
+            break;
+        case MV_PMODE_INTFR_1MV:
+            v->blk_mv_type[s->block_index[0]] = 0;
+            v->blk_mv_type[s->block_index[1]] = 0;
+            v->blk_mv_type[s->block_index[2]] = 0;
+            v->blk_mv_type[s->block_index[3]] = 0;
+            break;
+        }
+        if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB
+            for (i = 0; i < 4; i++) {
+                s->current_picture.motion_val[1][s->block_index[i]][0] = 0;
+                s->current_picture.motion_val[1][s->block_index[i]][1] = 0;
+            }
+            s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;
+            s->mb_intra = v->is_intra[s->mb_x] = 1;
+            for (i = 0; i < 6; i++)
+                v->mb_type[0][s->block_index[i]] = 1;
+            fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);
+            mb_has_coeffs = get_bits1(gb);
+            if (mb_has_coeffs)
+                cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
+            v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);
+            GET_MQUANT();
+            s->current_picture.qscale_table[mb_pos] = mquant;
+            /* Set DC scale - y and c use the same (not sure if necessary here) */
+            s->y_dc_scale = s->y_dc_scale_table[mquant];
+            s->c_dc_scale = s->c_dc_scale_table[mquant];
+            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);
+                v->mb_type[0][s->block_index[i]] = s->mb_intra;
+                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;
+                v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
+                if (i < 4) {
+                    stride_y = s->linesize << fieldtx;
+                    off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;
+                } else {
+                    stride_y = s->uvlinesize;
+                    off = 0;
+                }
+                s->idsp.put_signed_pixels_clamped(s->block[i],
+                                                  s->dest[dst_idx] + off,
+                                                  stride_y);
+                //TODO: loop filter
+            }
+
+        } else { // inter MB
+            mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];
+            if (mb_has_coeffs)
+                cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
+            if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {
+                v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);
+            } else {
+                if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)
+                    || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {
+                    v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
+                }
+            }
+            s->mb_intra = v->is_intra[s->mb_x] = 0;
+            for (i = 0; i < 6; i++)
+                v->mb_type[0][s->block_index[i]] = 0;
+            fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];
+            /* for all motion vector read MVDATA and motion compensate each block */
+            dst_idx = 0;
+            if (fourmv) {
+                mvbp = v->fourmvbp;
+                for (i = 0; i < 6; i++) {
+                    if (i < 4) {
+                        dmv_x = dmv_y = 0;
+                        val   = ((mvbp >> (3 - i)) & 1);
+                        if (val) {
+                            get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+                        }
+                        ff_vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0);
+                        ff_vc1_mc_4mv_luma(v, i, 0, 0);
+                    } else if (i == 4) {
+                        ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
+                    }
+                }
+            } else if (twomv) {
+                mvbp  = v->twomvbp;
+                dmv_x = dmv_y = 0;
+                if (mvbp & 2) {
+                    get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+                }
+                ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);
+                ff_vc1_mc_4mv_luma(v, 0, 0, 0);
+                ff_vc1_mc_4mv_luma(v, 1, 0, 0);
+                dmv_x = dmv_y = 0;
+                if (mvbp & 1) {
+                    get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+                }
+                ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);
+                ff_vc1_mc_4mv_luma(v, 2, 0, 0);
+                ff_vc1_mc_4mv_luma(v, 3, 0, 0);
+                ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
+            } else {
+                mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];
+                dmv_x = dmv_y = 0;
+                if (mvbp) {
+                    get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+                }
+                ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);
+                ff_vc1_mc_1mv(v, 0);
+            }
+            if (cbp)
+                GET_MQUANT();  // p. 227
+            s->current_picture.qscale_table[mb_pos] = mquant;
+            if (!v->ttmbf && cbp)
+                ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
+            for (i = 0; i < 6; i++) {
+                s->dc_val[0][s->block_index[i]] = 0;
+                dst_idx += i >> 2;
+                val = ((cbp >> (5 - i)) & 1);
+                if (!fieldtx)
+                    off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
+                else
+                    off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));
+                if (val) {
+                    pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
+                                             first_block, s->dest[dst_idx] + off,
+                                             (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),
+                                             (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);
+                    block_cbp |= pat << (i << 2);
+                    if (!v->ttmbf && ttmb < 8)
+                        ttmb = -1;
+                    first_block = 0;
+                }
+            }
+        }
+    } else { // skipped
+        s->mb_intra = v->is_intra[s->mb_x] = 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;
+        v->blk_mv_type[s->block_index[0]] = 0;
+        v->blk_mv_type[s->block_index[1]] = 0;
+        v->blk_mv_type[s->block_index[2]] = 0;
+        v->blk_mv_type[s->block_index[3]] = 0;
+        ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);
+        ff_vc1_mc_1mv(v, 0);
+    }
+    if (s->mb_x == s->mb_width - 1)
+        memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0])*s->mb_stride);
+    return 0;
+}
+
+static int vc1_decode_p_mb_intfi(VC1Context *v)
+{
+    MpegEncContext *s = &v->s;
+    GetBitContext *gb = &s->gb;
+    int i;
+    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 */
+
+    int mb_has_coeffs = 1; /* last_flag */
+    int dmv_x, dmv_y; /* Differential MV components */
+    int val; /* temp values */
+    int first_block = 1;
+    int dst_idx, off;
+    int pred_flag;
+    int block_cbp = 0, pat, block_tt = 0;
+    int idx_mbmode = 0;
+
+    mquant = v->pq; /* Loosy initialization */
+
+    idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);
+    if (idx_mbmode <= 1) { // intra MB
+        s->mb_intra = v->is_intra[s->mb_x] = 1;
+        s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;
+        s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;
+        s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;
+        GET_MQUANT();
+        s->current_picture.qscale_table[mb_pos] = mquant;
+        /* Set DC scale - y and c use the same (not sure if necessary here) */
+        s->y_dc_scale = s->y_dc_scale_table[mquant];
+        s->c_dc_scale = s->c_dc_scale_table[mquant];
+        v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);
+        mb_has_coeffs = idx_mbmode & 1;
+        if (mb_has_coeffs)
+            cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);
+        dst_idx = 0;
+        for (i = 0; i < 6; i++) {
+            s->dc_val[0][s->block_index[i]]  = 0;
+            v->mb_type[0][s->block_index[i]] = 1;
+            dst_idx += i >> 2;
+            val = ((cbp >> (5 - i)) & 1);
+            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;
+            v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
+            off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
+            s->idsp.put_signed_pixels_clamped(s->block[i],
+                                              s->dest[dst_idx] + off,
+                                              (i & 4) ? s->uvlinesize
+                                                      : s->linesize);
+            // TODO: loop filter
+        }
+    } else {
+        s->mb_intra = v->is_intra[s->mb_x] = 0;
+        s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;
+        for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;
+        if (idx_mbmode <= 5) { // 1-MV
+            dmv_x = dmv_y = pred_flag = 0;
+            if (idx_mbmode & 1) {
+                get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);
+            }
+            ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);
+            ff_vc1_mc_1mv(v, 0);
+            mb_has_coeffs = !(idx_mbmode & 2);
+        } else { // 4-MV
+            v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
+            for (i = 0; i < 6; i++) {
+                if (i < 4) {
+                    dmv_x = dmv_y = pred_flag = 0;
+                    val   = ((v->fourmvbp >> (3 - i)) & 1);
+                    if (val) {
+                        get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);
+                    }
+                    ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);
+                    ff_vc1_mc_4mv_luma(v, i, 0, 0);
+                } else if (i == 4)
+                    ff_vc1_mc_4mv_chroma(v, 0);
+            }
+            mb_has_coeffs = idx_mbmode & 1;
+        }
+        if (mb_has_coeffs)
+            cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
+        if (cbp) {
+            GET_MQUANT();
+        }
+        s->current_picture.qscale_table[mb_pos] = mquant;
+        if (!v->ttmbf && cbp) {
+            ttmb = get_vlc2(gb, ff_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;
+            if (val) {
+                pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
+                                         first_block, s->dest[dst_idx] + off,
+                                         (i & 4) ? s->uvlinesize : s->linesize,
+                                         (i & 4) && (s->flags & CODEC_FLAG_GRAY),
+                                         &block_tt);
+                block_cbp |= pat << (i << 2);
+                if (!v->ttmbf && ttmb < 8) ttmb = -1;
+                first_block = 0;
+            }
+        }
+    }
+    if (s->mb_x == s->mb_width - 1)
+        memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);
+    return 0;
+}
+
+/** 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 */
+    int mb_has_coeffs = 0; /* last_flag */
+    int index, index1; /* LUT indexes */
+    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; /* lossy 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];
+
+    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;
+        ff_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;
+        s->current_picture.qscale_table[mb_pos] = mquant;
+        if (!v->ttmbf)
+            ttmb = get_vlc2(gb, ff_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;
+        ff_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 */
+            ff_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;
+            ff_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 */
+                    ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
+                    vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
+                    return;
+                }
+            }
+            ff_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, ff_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;
+            v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
+            if (v->rangeredfrm)
+                for (j = 0; j < 64; j++)
+                    s->block[i][j] <<= 1;
+            s->idsp.put_signed_pixels_clamped(s->block[i],
+                                              s->dest[dst_idx] + off,
+                                              i & 4 ? s->uvlinesize
+                                                    : s->linesize);
+        } else if (val) {
+            vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
+                               first_block, s->dest[dst_idx] + off,
+                               (i & 4) ? s->uvlinesize : s->linesize,
+                               (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);
+            if (!v->ttmbf && ttmb < 8)
+                ttmb = -1;
+            first_block = 0;
+        }
+    }
+}
+
+/** Decode one B-frame MB (in interlaced field B picture)
+ */
+static void vc1_decode_b_mb_intfi(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 */
+    int mb_has_coeffs = 0; /* last_flag */
+    int val; /* temp value */
+    int first_block = 1;
+    int dst_idx, off;
+    int fwd;
+    int dmv_x[2], dmv_y[2], pred_flag[2];
+    int bmvtype = BMV_TYPE_BACKWARD;
+    int idx_mbmode, interpmvp;
+
+    mquant      = v->pq; /* Loosy initialization */
+    s->mb_intra = 0;
+
+    idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);
+    if (idx_mbmode <= 1) { // intra MB
+        s->mb_intra = v->is_intra[s->mb_x] = 1;
+        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 + v->mb_off]         = MB_TYPE_INTRA;
+        GET_MQUANT();
+        s->current_picture.qscale_table[mb_pos] = mquant;
+        /* Set DC scale - y and c use the same (not sure if necessary here) */
+        s->y_dc_scale = s->y_dc_scale_table[mquant];
+        s->c_dc_scale = s->c_dc_scale_table[mquant];
+        v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);
+        mb_has_coeffs = idx_mbmode & 1;
+        if (mb_has_coeffs)
+            cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_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);
+            v->mb_type[0][s->block_index[i]] = s->mb_intra;
+            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;
+            v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
+            if (v->rangeredfrm)
+                for (j = 0; j < 64; j++)
+                    s->block[i][j] <<= 1;
+            off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
+            s->idsp.put_signed_pixels_clamped(s->block[i],
+                                              s->dest[dst_idx] + off,
+                                              (i & 4) ? s->uvlinesize
+                                                      : s->linesize);
+            // TODO: yet to perform loop filter
+        }
+    } else {
+        s->mb_intra = v->is_intra[s->mb_x] = 0;
+        s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;
+        for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;
+        if (v->fmb_is_raw)
+            fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);
+        else
+            fwd = v->forward_mb_plane[mb_pos];
+        if (idx_mbmode <= 5) { // 1-MV
+            dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;
+            pred_flag[0] = pred_flag[1] = 0;
+            if (fwd)
+                bmvtype = BMV_TYPE_FORWARD;
+            else {
+                bmvtype = decode012(gb);
+                switch (bmvtype) {
+                case 0:
+                    bmvtype = BMV_TYPE_BACKWARD;
+                    break;
+                case 1:
+                    bmvtype = BMV_TYPE_DIRECT;
+                    break;
+                case 2:
+                    bmvtype   = BMV_TYPE_INTERPOLATED;
+                    interpmvp = get_bits1(gb);
+                }
+            }
+            v->bmvtype = bmvtype;
+            if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {
+                get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);
+            }
+            if (bmvtype == BMV_TYPE_INTERPOLATED && interpmvp) {
+                get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);
+            }
+            if (bmvtype == BMV_TYPE_DIRECT) {
+                dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;
+                dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;
+            }
+            ff_vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);
+            vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);
+            mb_has_coeffs = !(idx_mbmode & 2);
+        } else { // 4-MV
+            if (fwd)
+                bmvtype = BMV_TYPE_FORWARD;
+            v->bmvtype  = bmvtype;
+            v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
+            for (i = 0; i < 6; i++) {
+                if (i < 4) {
+                    dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;
+                    dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;
+                    val = ((v->fourmvbp >> (3 - i)) & 1);
+                    if (val) {
+                        get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],
+                                                 &dmv_y[bmvtype == BMV_TYPE_BACKWARD],
+                                             &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);
+                    }
+                    ff_vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);
+                    ff_vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD, 0);
+                } else if (i == 4)
+                    ff_vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);
+            }
+            mb_has_coeffs = idx_mbmode & 1;
+        }
+        if (mb_has_coeffs)
+            cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
+        if (cbp) {
+            GET_MQUANT();
+        }
+        s->current_picture.qscale_table[mb_pos] = mquant;
+        if (!v->ttmbf && cbp) {
+            ttmb = get_vlc2(gb, ff_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;
+            if (val) {
+                vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
+                                   first_block, s->dest[dst_idx] + off,
+                                   (i & 4) ? s->uvlinesize : s->linesize,
+                                   (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);
+                if (!v->ttmbf && ttmb < 8)
+                    ttmb = -1;
+                first_block = 0;
+            }
+        }
+    }
+}
+
+/** Decode one B-frame MB (in interlaced frame B picture)
+ */
+static int vc1_decode_b_mb_intfr(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 */
+    int mvsw = 0; /* motion vector switch */
+    int mb_has_coeffs = 1; /* last_flag */
+    int dmv_x, dmv_y; /* Differential MV components */
+    int val; /* temp value */
+    int first_block = 1;
+    int dst_idx, off;
+    int skipped, direct, twomv = 0;
+    int block_cbp = 0, pat, block_tt = 0;
+    int idx_mbmode = 0, mvbp;
+    int stride_y, fieldtx;
+    int bmvtype = BMV_TYPE_BACKWARD;
+    int dir, dir2;
+
+    mquant = v->pq; /* Lossy initialization */
+    s->mb_intra = 0;
+    if (v->skip_is_raw)
+        skipped = get_bits1(gb);
+    else
+        skipped = v->s.mbskip_table[mb_pos];
+
+    if (!skipped) {
+        idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2);
+        if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {
+            twomv = 1;
+            v->blk_mv_type[s->block_index[0]] = 1;
+            v->blk_mv_type[s->block_index[1]] = 1;
+            v->blk_mv_type[s->block_index[2]] = 1;
+            v->blk_mv_type[s->block_index[3]] = 1;
+        } else {
+            v->blk_mv_type[s->block_index[0]] = 0;
+            v->blk_mv_type[s->block_index[1]] = 0;
+            v->blk_mv_type[s->block_index[2]] = 0;
+            v->blk_mv_type[s->block_index[3]] = 0;
+        }
+    }
+
+    if (v->dmb_is_raw)
+        direct = get_bits1(gb);
+    else
+        direct = v->direct_mb_plane[mb_pos];
+
+    if (direct) {
+        s->mv[0][0][0] = s->current_picture.motion_val[0][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 0, s->quarter_sample);
+        s->mv[0][0][1] = s->current_picture.motion_val[0][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 0, s->quarter_sample);
+        s->mv[1][0][0] = s->current_picture.motion_val[1][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 1, s->quarter_sample);
+        s->mv[1][0][1] = s->current_picture.motion_val[1][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 1, s->quarter_sample);
+
+        if (twomv) {
+            s->mv[0][2][0] = s->current_picture.motion_val[0][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 0, s->quarter_sample);
+            s->mv[0][2][1] = s->current_picture.motion_val[0][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 0, s->quarter_sample);
+            s->mv[1][2][0] = s->current_picture.motion_val[1][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 1, s->quarter_sample);
+            s->mv[1][2][1] = s->current_picture.motion_val[1][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 1, s->quarter_sample);
+
+            for (i = 1; i < 4; i += 2) {
+                s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];
+                s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];
+                s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];
+                s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];
+            }
+        } else {
+            for (i = 1; i < 4; i++) {
+                s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];
+                s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];
+                s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];
+                s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];
+            }
+        }
+    }
+
+    if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB
+        for (i = 0; i < 4; i++) {
+            s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = 0;
+            s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = 0;
+            s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = 0;
+            s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = 0;
+        }
+        s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;
+        s->mb_intra = v->is_intra[s->mb_x] = 1;
+        for (i = 0; i < 6; i++)
+            v->mb_type[0][s->block_index[i]] = 1;
+        fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);
+        mb_has_coeffs = get_bits1(gb);
+        if (mb_has_coeffs)
+            cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
+        v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);
+        GET_MQUANT();
+        s->current_picture.qscale_table[mb_pos] = mquant;
+        /* Set DC scale - y and c use the same (not sure if necessary here) */
+        s->y_dc_scale = s->y_dc_scale_table[mquant];
+        s->c_dc_scale = s->c_dc_scale_table[mquant];
+        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);
+            v->mb_type[0][s->block_index[i]] = s->mb_intra;
+            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;
+            v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
+            if (i < 4) {
+                stride_y = s->linesize << fieldtx;
+                off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;
+            } else {
+                stride_y = s->uvlinesize;
+                off = 0;
+            }
+            s->idsp.put_signed_pixels_clamped(s->block[i],
+                                              s->dest[dst_idx] + off,
+                                              stride_y);
+        }
+    } else {
+        s->mb_intra = v->is_intra[s->mb_x] = 0;
+        if (!direct) {
+            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;
+                }
+            }
+
+            if (twomv && bmvtype != BMV_TYPE_INTERPOLATED)
+                mvsw = get_bits1(gb);
+        }
+
+        if (!skipped) { // inter MB
+            mb_has_coeffs = ff_vc1_mbmode_intfrp[0][idx_mbmode][3];
+            if (mb_has_coeffs)
+                cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
+            if (!direct) {
+                if (bmvtype == BMV_TYPE_INTERPOLATED && twomv) {
+                    v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
+                } else if (bmvtype == BMV_TYPE_INTERPOLATED || twomv) {
+                    v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);
+                }
+            }
+
+            for (i = 0; i < 6; i++)
+                v->mb_type[0][s->block_index[i]] = 0;
+            fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[0][idx_mbmode][1];
+            /* for all motion vector read MVDATA and motion compensate each block */
+            dst_idx = 0;
+            if (direct) {
+                if (twomv) {
+                    for (i = 0; i < 4; i++) {
+                        ff_vc1_mc_4mv_luma(v, i, 0, 0);
+                        ff_vc1_mc_4mv_luma(v, i, 1, 1);
+                    }
+                    ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
+                    ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);
+                } else {
+                    ff_vc1_mc_1mv(v, 0);
+                    ff_vc1_interp_mc(v);
+                }
+            } else if (twomv && bmvtype == BMV_TYPE_INTERPOLATED) {
+                mvbp = v->fourmvbp;
+                for (i = 0; i < 4; i++) {
+                    dir = i==1 || i==3;
+                    dmv_x = dmv_y = 0;
+                    val = ((mvbp >> (3 - i)) & 1);
+                    if (val)
+                        get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+                    j = i > 1 ? 2 : 0;
+                    ff_vc1_pred_mv_intfr(v, j, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);
+                    ff_vc1_mc_4mv_luma(v, j, dir, dir);
+                    ff_vc1_mc_4mv_luma(v, j+1, dir, dir);
+                }
+
+                ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
+                ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);
+            } else if (bmvtype == BMV_TYPE_INTERPOLATED) {
+                mvbp = v->twomvbp;
+                dmv_x = dmv_y = 0;
+                if (mvbp & 2)
+                    get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+
+                ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);
+                ff_vc1_mc_1mv(v, 0);
+
+                dmv_x = dmv_y = 0;
+                if (mvbp & 1)
+                    get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+
+                ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 1);
+                ff_vc1_interp_mc(v);
+            } else if (twomv) {
+                dir = bmvtype == BMV_TYPE_BACKWARD;
+                dir2 = dir;
+                if (mvsw)
+                    dir2 = !dir;
+                mvbp = v->twomvbp;
+                dmv_x = dmv_y = 0;
+                if (mvbp & 2)
+                    get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+                ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);
+
+                dmv_x = dmv_y = 0;
+                if (mvbp & 1)
+                    get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+                ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir2);
+
+                if (mvsw) {
+                    for (i = 0; i < 2; i++) {
+                        s->mv[dir][i+2][0] = s->mv[dir][i][0] = s->current_picture.motion_val[dir][s->block_index[i+2]][0] = s->current_picture.motion_val[dir][s->block_index[i]][0];
+                        s->mv[dir][i+2][1] = s->mv[dir][i][1] = s->current_picture.motion_val[dir][s->block_index[i+2]][1] = s->current_picture.motion_val[dir][s->block_index[i]][1];
+                        s->mv[dir2][i+2][0] = s->mv[dir2][i][0] = s->current_picture.motion_val[dir2][s->block_index[i]][0] = s->current_picture.motion_val[dir2][s->block_index[i+2]][0];
+                        s->mv[dir2][i+2][1] = s->mv[dir2][i][1] = s->current_picture.motion_val[dir2][s->block_index[i]][1] = s->current_picture.motion_val[dir2][s->block_index[i+2]][1];
+                    }
+                } else {
+                    ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);
+                    ff_vc1_pred_mv_intfr(v, 2, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);
+                }
+
+                ff_vc1_mc_4mv_luma(v, 0, dir, 0);
+                ff_vc1_mc_4mv_luma(v, 1, dir, 0);
+                ff_vc1_mc_4mv_luma(v, 2, dir2, 0);
+                ff_vc1_mc_4mv_luma(v, 3, dir2, 0);
+                ff_vc1_mc_4mv_chroma4(v, dir, dir2, 0);
+            } else {
+                dir = bmvtype == BMV_TYPE_BACKWARD;
+
+                mvbp = ff_vc1_mbmode_intfrp[0][idx_mbmode][2];
+                dmv_x = dmv_y = 0;
+                if (mvbp)
+                    get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+
+                ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], dir);
+                v->blk_mv_type[s->block_index[0]] = 1;
+                v->blk_mv_type[s->block_index[1]] = 1;
+                v->blk_mv_type[s->block_index[2]] = 1;
+                v->blk_mv_type[s->block_index[3]] = 1;
+                ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);
+                for (i = 0; i < 2; i++) {
+                    s->mv[!dir][i+2][0] = s->mv[!dir][i][0] = s->current_picture.motion_val[!dir][s->block_index[i+2]][0] = s->current_picture.motion_val[!dir][s->block_index[i]][0];
+                    s->mv[!dir][i+2][1] = s->mv[!dir][i][1] = s->current_picture.motion_val[!dir][s->block_index[i+2]][1] = s->current_picture.motion_val[!dir][s->block_index[i]][1];
+                }
+                ff_vc1_mc_1mv(v, dir);
+            }
+
+            if (cbp)
+                GET_MQUANT();  // p. 227
+            s->current_picture.qscale_table[mb_pos] = mquant;
+            if (!v->ttmbf && cbp)
+                ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
+            for (i = 0; i < 6; i++) {
+                s->dc_val[0][s->block_index[i]] = 0;
+                dst_idx += i >> 2;
+                val = ((cbp >> (5 - i)) & 1);
+                if (!fieldtx)
+                    off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
+                else
+                    off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));
+                if (val) {
+                    pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
+                                             first_block, s->dest[dst_idx] + off,
+                                             (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),
+                                             (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);
+                    block_cbp |= pat << (i << 2);
+                    if (!v->ttmbf && ttmb < 8)
+                        ttmb = -1;
+                    first_block = 0;
+                }
+            }
+
+        } else { // skipped
+            dir = 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;
+            v->blk_mv_type[s->block_index[0]] = 0;
+            v->blk_mv_type[s->block_index[1]] = 0;
+            v->blk_mv_type[s->block_index[2]] = 0;
+            v->blk_mv_type[s->block_index[3]] = 0;
+
+            if (!direct) {
+                if (bmvtype == BMV_TYPE_INTERPOLATED) {
+                    ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);
+                    ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 1);
+                } else {
+                    dir = bmvtype == BMV_TYPE_BACKWARD;
+                    ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], dir);
+                    if (mvsw) {
+                        int dir2 = dir;
+                        if (mvsw)
+                            dir2 = !dir;
+                        for (i = 0; i < 2; i++) {
+                            s->mv[dir][i+2][0] = s->mv[dir][i][0] = s->current_picture.motion_val[dir][s->block_index[i+2]][0] = s->current_picture.motion_val[dir][s->block_index[i]][0];
+                            s->mv[dir][i+2][1] = s->mv[dir][i][1] = s->current_picture.motion_val[dir][s->block_index[i+2]][1] = s->current_picture.motion_val[dir][s->block_index[i]][1];
+                            s->mv[dir2][i+2][0] = s->mv[dir2][i][0] = s->current_picture.motion_val[dir2][s->block_index[i]][0] = s->current_picture.motion_val[dir2][s->block_index[i+2]][0];
+                            s->mv[dir2][i+2][1] = s->mv[dir2][i][1] = s->current_picture.motion_val[dir2][s->block_index[i]][1] = s->current_picture.motion_val[dir2][s->block_index[i+2]][1];
+                        }
+                    } else {
+                        v->blk_mv_type[s->block_index[0]] = 1;
+                        v->blk_mv_type[s->block_index[1]] = 1;
+                        v->blk_mv_type[s->block_index[2]] = 1;
+                        v->blk_mv_type[s->block_index[3]] = 1;
+                        ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);
+                        for (i = 0; i < 2; i++) {
+                            s->mv[!dir][i+2][0] = s->mv[!dir][i][0] = s->current_picture.motion_val[!dir][s->block_index[i+2]][0] = s->current_picture.motion_val[!dir][s->block_index[i]][0];
+                            s->mv[!dir][i+2][1] = s->mv[!dir][i][1] = s->current_picture.motion_val[!dir][s->block_index[i+2]][1] = s->current_picture.motion_val[!dir][s->block_index[i]][1];
+                        }
+                    }
+                }
+            }
+
+            ff_vc1_mc_1mv(v, dir);
+            if (direct || bmvtype == BMV_TYPE_INTERPOLATED) {
+                ff_vc1_interp_mc(v);
+            }
+        }
+    }
+    if (s->mb_x == s->mb_width - 1)
+        memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);
+    v->cbp[s->mb_x]      = block_cbp;
+    v->ttblk[s->mb_x]    = block_tt;
+    return 0;
+}
+
+/** 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;
+    for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {
+        s->mb_x = 0;
+        init_block_index(v);
+        for (; s->mb_x < v->end_mb_x; s->mb_x++) {
+            uint8_t *dst[6];
+            ff_update_block_index(s);
+            dst[0] = s->dest[0];
+            dst[1] = dst[0] + 8;
+            dst[2] = s->dest[0] + s->linesize * 8;
+            dst[3] = dst[2] + 8;
+            dst[4] = s->dest[1];
+            dst[5] = s->dest[2];
+            s->bdsp.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_bits1(&v->s.gb);
+
+            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);
+
+                if (k > 3 && (s->flags & CODEC_FLAG_GRAY))
+                    continue;
+                v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);
+                if (v->pq >= 9 && v->overlap) {
+                    if (v->rangeredfrm)
+                        for (j = 0; j < 64; j++)
+                            s->block[k][j] <<= 1;
+                    s->idsp.put_signed_pixels_clamped(s->block[k], dst[k],
+                                                      k & 4 ? s->uvlinesize
+                                                            : s->linesize);
+                } else {
+                    if (v->rangeredfrm)
+                        for (j = 0; j < 64; j++)
+                            s->block[k][j] = (s->block[k][j] - 64) << 1;
+                    s->idsp.put_pixels_clamped(s->block[k], dst[k],
+                                               k & 4 ? s->uvlinesize
+                                                     : s->linesize);
+                }
+            }
+
+            if (v->pq >= 9 && v->overlap) {
+                if (s->mb_x) {
+                    v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);
+                    v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
+                    if (!(s->flags & CODEC_FLAG_GRAY)) {
+                        v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);
+                        v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);
+                    }
+                }
+                v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);
+                v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
+                if (!s->first_slice_line) {
+                    v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);
+                    v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);
+                    if (!(s->flags & CODEC_FLAG_GRAY)) {
+                        v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);
+                        v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);
+                    }
+                }
+                v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
+                v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
+            }
+            if (v->s.loop_filter)
+                ff_vc1_loop_filter_iblk(v, v->pq);
+
+            if (get_bits_count(&s->gb) > v->bits) {
+                ff_er_add_slice(&s->er, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);
+                av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",
+                       get_bits_count(&s->gb), v->bits);
+                return;
+            }
+        }
+        if (!v->s.loop_filter)
+            ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
+        else if (s->mb_y)
+            ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);
+
+        s->first_slice_line = 0;
+    }
+    if (v->s.loop_filter)
+        ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);
+
+    /* This is intentionally mb_height and not end_mb_y - unlike in advanced
+     * profile, these only differ are when decoding MSS2 rectangles. */
+    ff_er_add_slice(&s->er, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);
+}
+
+/** Decode blocks of I-frame for advanced profile
+ */
+static void vc1_decode_i_blocks_adv(VC1Context *v)
+{
+    int k;
+    MpegEncContext *s = &v->s;
+    int cbp, val;
+    uint8_t *coded_val;
+    int mb_pos;
+    int mquant = v->pq;
+    int mqdiff;
+    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;
+    s->mb_y             = s->start_mb_y;
+    if (s->start_mb_y) {
+        s->mb_x = 0;
+        init_block_index(v);
+        memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,
+               (1 + s->b8_stride) * sizeof(*s->coded_block));
+    }
+    for (; s->mb_y < s->end_mb_y; s->mb_y++) {
+        s->mb_x = 0;
+        init_block_index(v);
+        for (;s->mb_x < s->mb_width; s->mb_x++) {
+            int16_t (*block)[64] = v->block[v->cur_blk_idx];
+            ff_update_block_index(s);
+            s->bdsp.clear_blocks(block[0]);
+            mb_pos = s->mb_x + s->mb_y * s->mb_stride;
+            s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;
+            s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;
+            s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;
+
+            // do actual MB decoding and displaying
+            if (v->fieldtx_is_raw)
+                v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);
+            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_bits1(&v->s.gb);
+            else
+                v->s.ac_pred = v->acpred_plane[mb_pos];
+
+            if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)
+                v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);
+
+            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, block[k], k, val,
+                                       (k < 4) ? v->codingset : v->codingset2, mquant);
+
+                if (k > 3 && (s->flags & CODEC_FLAG_GRAY))
+                    continue;
+                v->vc1dsp.vc1_inv_trans_8x8(block[k]);
+            }
+
+            ff_vc1_smooth_overlap_filter_iblk(v);
+            vc1_put_signed_blocks_clamped(v);
+            if (v->s.loop_filter)
+                ff_vc1_loop_filter_iblk_delayed(v, v->pq);
+
+            if (get_bits_count(&s->gb) > v->bits) {
+                // TODO: may need modification to handle slice coding
+                ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);
+                av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",
+                       get_bits_count(&s->gb), v->bits);
+                return;
+            }
+        }
+        if (!v->s.loop_filter)
+            ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
+        else if (s->mb_y)
+            ff_mpeg_draw_horiz_band(s, (s->mb_y-1) * 16, 16);
+        s->first_slice_line = 0;
+    }
+
+    /* raw bottom MB row */
+    s->mb_x = 0;
+    init_block_index(v);
+
+    for (;s->mb_x < s->mb_width; s->mb_x++) {
+        ff_update_block_index(s);
+        vc1_put_signed_blocks_clamped(v);
+        if (v->s.loop_filter)
+            ff_vc1_loop_filter_iblk_delayed(v, v->pq);
+    }
+    if (v->s.loop_filter)
+        ff_mpeg_draw_horiz_band(s, (s->end_mb_y-1)*16, 16);
+    ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,
+                    (s->end_mb_y << v->field_mode) - 1, ER_MB_END);
+}
+
+static void vc1_decode_p_blocks(VC1Context *v)
+{
+    MpegEncContext *s = &v->s;
+    int apply_loop_filter;
+
+    /* 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;
+    }
+
+    apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY) &&
+                          v->fcm == PROGRESSIVE;
+    s->first_slice_line = 1;
+    memset(v->cbp_base, 0, sizeof(v->cbp_base[0])*2*s->mb_stride);
+    for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {
+        s->mb_x = 0;
+        init_block_index(v);
+        for (; s->mb_x < s->mb_width; s->mb_x++) {
+            ff_update_block_index(s);
+
+            if (v->fcm == ILACE_FIELD)
+                vc1_decode_p_mb_intfi(v);
+            else if (v->fcm == ILACE_FRAME)
+                vc1_decode_p_mb_intfr(v);
+            else vc1_decode_p_mb(v);
+            if (s->mb_y != s->start_mb_y && apply_loop_filter)
+                ff_vc1_apply_p_loop_filter(v);
+            if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {
+                // TODO: may need modification to handle slice coding
+                ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);
+                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;
+            }
+        }
+        memmove(v->cbp_base,      v->cbp,      sizeof(v->cbp_base[0])      * s->mb_stride);
+        memmove(v->ttblk_base,    v->ttblk,    sizeof(v->ttblk_base[0])    * s->mb_stride);
+        memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);
+        memmove(v->luma_mv_base,  v->luma_mv,  sizeof(v->luma_mv_base[0])  * s->mb_stride);
+        if (s->mb_y != s->start_mb_y) ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);
+        s->first_slice_line = 0;
+    }
+    if (apply_loop_filter) {
+        s->mb_x = 0;
+        init_block_index(v);
+        for (; s->mb_x < s->mb_width; s->mb_x++) {
+            ff_update_block_index(s);
+            ff_vc1_apply_p_loop_filter(v);
+        }
+    }
+    if (s->end_mb_y >= s->start_mb_y)
+        ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);
+    ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,
+                    (s->end_mb_y << v->field_mode) - 1, ER_MB_END);
+}
+
+static void vc1_decode_b_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;
+    }
+
+    s->first_slice_line = 1;
+    for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {
+        s->mb_x = 0;
+        init_block_index(v);
+        for (; s->mb_x < s->mb_width; s->mb_x++) {
+            ff_update_block_index(s);
+
+            if (v->fcm == ILACE_FIELD)
+                vc1_decode_b_mb_intfi(v);
+            else if (v->fcm == ILACE_FRAME)
+                vc1_decode_b_mb_intfr(v);
+            else
+                vc1_decode_b_mb(v);
+            if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {
+                // TODO: may need modification to handle slice coding
+                ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);
+                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;
+            }
+            if (v->s.loop_filter)
+                ff_vc1_loop_filter_iblk(v, v->pq);
+        }
+        if (!v->s.loop_filter)
+            ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
+        else if (s->mb_y)
+            ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);
+        s->first_slice_line = 0;
+    }
+    if (v->s.loop_filter)
+        ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);
+    ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,
+                    (s->end_mb_y << v->field_mode) - 1, ER_MB_END);
+}
+
+static void vc1_decode_skip_blocks(VC1Context *v)
+{
+    MpegEncContext *s = &v->s;
+
+    if (!v->s.last_picture.f->data[0])
+        return;
+
+    ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);
+    s->first_slice_line = 1;
+    for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {
+        s->mb_x = 0;
+        init_block_index(v);
+        ff_update_block_index(s);
+        memcpy(s->dest[0], s->last_picture.f->data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);
+        memcpy(s->dest[1], s->last_picture.f->data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);
+        memcpy(s->dest[2], s->last_picture.f->data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);
+        ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
+        s->first_slice_line = 0;
+    }
+    s->pict_type = AV_PICTURE_TYPE_P;
+}
+
+void ff_vc1_decode_blocks(VC1Context *v)
+{
+
+    v->s.esc3_level_length = 0;
+    if (v->x8_type) {
+        ff_intrax8_decode_picture(&v->x8, 2*v->pq + v->halfpq, v->pq * !v->pquantizer);
+    } else {
+        v->cur_blk_idx     =  0;
+        v->left_blk_idx    = -1;
+        v->topleft_blk_idx =  1;
+        v->top_blk_idx     =  2;
+        switch (v->s.pict_type) {
+        case AV_PICTURE_TYPE_I:
+            if (v->profile == PROFILE_ADVANCED)
+                vc1_decode_i_blocks_adv(v);
+            else
+                vc1_decode_i_blocks(v);
+            break;
+        case AV_PICTURE_TYPE_P:
+            if (v->p_frame_skipped)
+                vc1_decode_skip_blocks(v);
+            else
+                vc1_decode_p_blocks(v);
+            break;
+        case AV_PICTURE_TYPE_B:
+            if (v->bi_type) {
+                if (v->profile == PROFILE_ADVANCED)
+                    vc1_decode_i_blocks_adv(v);
+                else
+                    vc1_decode_i_blocks(v);
+            } else
+                vc1_decode_b_blocks(v);
+            break;
+        }
+    }
+}