/*
  * 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 FFmpeg.
  *
  * FFmpeg 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.
  *
  * FFmpeg 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 FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**

  * @file

  * VC-1 and WMV3 decoder
  */

 #include "internal.h"
 #include "avcodec.h"

 #include "error_resilience.h"

 #include "mpegvideo.h"

 #include "h263.h"

 #include "h264chroma.h"

 #include "vc1.h"
 #include "vc1data.h"
 #include "vc1acdata.h"
 #include "msmpeg4data.h"
 #include "unary.h"
 #include "mathops.h"

 #include "vdpau_internal.h"

 #include "libavutil/avassert.h"

 
 #undef NDEBUG
 #include <assert.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
  * @{
  */
 
 

 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->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][0],
                                              s->dest[0] - 16 * s->linesize - 16,

                                              stride_y);

             s->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][1],
                                              s->dest[0] - 16 * s->linesize - 8,

                                              stride_y);

             s->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][2],

                                              s->dest[0] - v_dist * s->linesize - 16,
                                              stride_y);

             s->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][3],

                                              s->dest[0] - v_dist * s->linesize - 8,
                                              stride_y);

             s->dsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][4],
                                              s->dest[1] - 8 * s->uvlinesize - 8,
                                              s->uvlinesize);
             s->dsp.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->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][0],
                                              s->dest[0] - 16 * s->linesize,

                                              stride_y);

             s->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][1],
                                              s->dest[0] - 16 * s->linesize + 8,

                                              stride_y);

             s->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][2],

                                              s->dest[0] - v_dist * s->linesize,
                                              stride_y);

             s->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][3],

                                              s->dest[0] - v_dist * s->linesize + 8,
                                              stride_y);

             s->dsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][4],
                                              s->dest[1] - 8 * s->uvlinesize,
                                              s->uvlinesize);
             s->dsp.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);
 }
 

 static void vc1_loop_filter_iblk(VC1Context *v, int pq)

 {

     MpegEncContext *s = &v->s;

     int j;
     if (!s->first_slice_line) {

         v->vc1dsp.vc1_v_loop_filter16(s->dest[0], s->linesize, pq);

         if (s->mb_x)

             v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize, s->linesize, pq);
         v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize + 8, s->linesize, pq);
         for (j = 0; j < 2; j++) {
             v->vc1dsp.vc1_v_loop_filter8(s->dest[j + 1], s->uvlinesize, pq);

             if (s->mb_x)

                 v->vc1dsp.vc1_h_loop_filter8(s->dest[j + 1] - 8 * s->uvlinesize, s->uvlinesize, pq);

         }
     }

     v->vc1dsp.vc1_v_loop_filter16(s->dest[0] + 8 * s->linesize, s->linesize, pq);

     if (s->mb_y == s->end_mb_y - 1) {

         if (s->mb_x) {

             v->vc1dsp.vc1_h_loop_filter16(s->dest[0], s->linesize, pq);
             v->vc1dsp.vc1_h_loop_filter8(s->dest[1], s->uvlinesize, pq);
             v->vc1dsp.vc1_h_loop_filter8(s->dest[2], s->uvlinesize, pq);

         }

         v->vc1dsp.vc1_h_loop_filter16(s->dest[0] + 8, s->linesize, pq);

     }
 }
 

 static void vc1_loop_filter_iblk_delayed(VC1Context *v, int pq)
 {
     MpegEncContext *s = &v->s;
     int j;
 
     /* The loopfilter runs 1 row and 1 column behind the overlap filter, which
      * means it runs two rows/cols behind the decoding loop. */
     if (!s->first_slice_line) {
         if (s->mb_x) {
             if (s->mb_y >= s->start_mb_y + 2) {
                 v->vc1dsp.vc1_v_loop_filter16(s->dest[0] - 16 * s->linesize - 16, s->linesize, pq);
 
                 if (s->mb_x >= 2)
                     v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 32 * s->linesize - 16, s->linesize, pq);
                 v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 32 * s->linesize - 8, s->linesize, pq);

                 for (j = 0; j < 2; j++) {
                     v->vc1dsp.vc1_v_loop_filter8(s->dest[j + 1] - 8 * s->uvlinesize - 8, s->uvlinesize, pq);

                     if (s->mb_x >= 2) {

                         v->vc1dsp.vc1_h_loop_filter8(s->dest[j + 1] - 16 * s->uvlinesize - 8, s->uvlinesize, pq);

                     }
                 }
             }
             v->vc1dsp.vc1_v_loop_filter16(s->dest[0] - 8 * s->linesize - 16, s->linesize, pq);
         }
 
         if (s->mb_x == s->mb_width - 1) {
             if (s->mb_y >= s->start_mb_y + 2) {
                 v->vc1dsp.vc1_v_loop_filter16(s->dest[0] - 16 * s->linesize, s->linesize, pq);
 
                 if (s->mb_x)
                     v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 32 * s->linesize, s->linesize, pq);
                 v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 32 * s->linesize + 8, s->linesize, pq);

                 for (j = 0; j < 2; j++) {
                     v->vc1dsp.vc1_v_loop_filter8(s->dest[j + 1] - 8 * s->uvlinesize, s->uvlinesize, pq);

                     if (s->mb_x >= 2) {

                         v->vc1dsp.vc1_h_loop_filter8(s->dest[j + 1] - 16 * s->uvlinesize, s->uvlinesize, pq);

                     }
                 }
             }
             v->vc1dsp.vc1_v_loop_filter16(s->dest[0] - 8 * s->linesize, s->linesize, pq);
         }
 

         if (s->mb_y == s->end_mb_y) {

             if (s->mb_x) {
                 if (s->mb_x >= 2)
                     v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize - 16, s->linesize, pq);
                 v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize - 8, s->linesize, pq);
                 if (s->mb_x >= 2) {

                     for (j = 0; j < 2; j++) {
                         v->vc1dsp.vc1_h_loop_filter8(s->dest[j + 1] - 8 * s->uvlinesize - 8, s->uvlinesize, pq);

                     }
                 }
             }
 
             if (s->mb_x == s->mb_width - 1) {
                 if (s->mb_x)
                     v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize, s->linesize, pq);
                 v->vc1dsp.vc1_h_loop_filter16(s->dest[0] - 16 * s->linesize + 8, s->linesize, pq);
                 if (s->mb_x) {

                     for (j = 0; j < 2; j++) {
                         v->vc1dsp.vc1_h_loop_filter8(s->dest[j + 1] - 8 * s->uvlinesize, s->uvlinesize, pq);

                     }
                 }
             }
         }
     }
 }
 
 static void vc1_smooth_overlap_filter_iblk(VC1Context *v)
 {
     MpegEncContext *s = &v->s;
     int mb_pos;
 
     if (v->condover == CONDOVER_NONE)
         return;
 
     mb_pos = s->mb_x + s->mb_y * s->mb_stride;
 
     /* Within a MB, the horizontal overlap always runs before the vertical.
      * To accomplish that, we run the H on left and internal borders of the
      * currently decoded MB. Then, we wait for the next overlap iteration
      * to do H overlap on the right edge of this MB, before moving over and
      * running the V overlap. Therefore, the V overlap makes us trail by one
      * MB col and the H overlap filter makes us trail by one MB row. This
      * is reflected in the time at which we run the put_pixels loop. */

     if (v->condover == CONDOVER_ALL || v->pq >= 9 || v->over_flags_plane[mb_pos]) {
         if (s->mb_x && (v->condover == CONDOVER_ALL || v->pq >= 9 ||
                         v->over_flags_plane[mb_pos - 1])) {

             v->vc1dsp.vc1_h_s_overlap(v->block[v->left_blk_idx][1],
                                       v->block[v->cur_blk_idx][0]);
             v->vc1dsp.vc1_h_s_overlap(v->block[v->left_blk_idx][3],
                                       v->block[v->cur_blk_idx][2]);

             if (!(s->flags & CODEC_FLAG_GRAY)) {

                 v->vc1dsp.vc1_h_s_overlap(v->block[v->left_blk_idx][4],
                                           v->block[v->cur_blk_idx][4]);
                 v->vc1dsp.vc1_h_s_overlap(v->block[v->left_blk_idx][5],
                                           v->block[v->cur_blk_idx][5]);
             }
         }
         v->vc1dsp.vc1_h_s_overlap(v->block[v->cur_blk_idx][0],
                                   v->block[v->cur_blk_idx][1]);
         v->vc1dsp.vc1_h_s_overlap(v->block[v->cur_blk_idx][2],
                                   v->block[v->cur_blk_idx][3]);
 
         if (s->mb_x == s->mb_width - 1) {

             if (!s->first_slice_line && (v->condover == CONDOVER_ALL || v->pq >= 9 ||
                                          v->over_flags_plane[mb_pos - s->mb_stride])) {

                 v->vc1dsp.vc1_v_s_overlap(v->block[v->top_blk_idx][2],
                                           v->block[v->cur_blk_idx][0]);
                 v->vc1dsp.vc1_v_s_overlap(v->block[v->top_blk_idx][3],
                                           v->block[v->cur_blk_idx][1]);

                 if (!(s->flags & CODEC_FLAG_GRAY)) {

                     v->vc1dsp.vc1_v_s_overlap(v->block[v->top_blk_idx][4],
                                               v->block[v->cur_blk_idx][4]);
                     v->vc1dsp.vc1_v_s_overlap(v->block[v->top_blk_idx][5],
                                               v->block[v->cur_blk_idx][5]);
                 }
             }
             v->vc1dsp.vc1_v_s_overlap(v->block[v->cur_blk_idx][0],
                                       v->block[v->cur_blk_idx][2]);
             v->vc1dsp.vc1_v_s_overlap(v->block[v->cur_blk_idx][1],
                                       v->block[v->cur_blk_idx][3]);
         }
     }
     if (s->mb_x && (v->condover == CONDOVER_ALL || v->over_flags_plane[mb_pos - 1])) {

         if (!s->first_slice_line && (v->condover == CONDOVER_ALL || v->pq >= 9 ||
                                      v->over_flags_plane[mb_pos - s->mb_stride - 1])) {

             v->vc1dsp.vc1_v_s_overlap(v->block[v->topleft_blk_idx][2],
                                       v->block[v->left_blk_idx][0]);
             v->vc1dsp.vc1_v_s_overlap(v->block[v->topleft_blk_idx][3],
                                       v->block[v->left_blk_idx][1]);

             if (!(s->flags & CODEC_FLAG_GRAY)) {

                 v->vc1dsp.vc1_v_s_overlap(v->block[v->topleft_blk_idx][4],
                                           v->block[v->left_blk_idx][4]);
                 v->vc1dsp.vc1_v_s_overlap(v->block[v->topleft_blk_idx][5],
                                           v->block[v->left_blk_idx][5]);
             }
         }
         v->vc1dsp.vc1_v_s_overlap(v->block[v->left_blk_idx][0],
                                   v->block[v->left_blk_idx][2]);
         v->vc1dsp.vc1_v_s_overlap(v->block[v->left_blk_idx][1],
                                   v->block[v->left_blk_idx][3]);
     }
 }
 

 /** Do motion compensation over 1 macroblock
  * Mostly adapted hpel_motion and qpel_motion from mpegvideo.c
  */
 static void vc1_mc_1mv(VC1Context *v, int dir)
 {
     MpegEncContext *s = &v->s;

     H264ChromaContext *h264chroma = &v->h264chroma;

     uint8_t *srcY, *srcU, *srcV;
     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

     int v_edge_pos = s->v_edge_pos >> v->field_mode;

     int i;

     uint8_t (*luty)[256], (*lutuv)[256];

     int use_ic;

 
     if ((!v->field_mode ||
          (v->ref_field_type[dir] == 1 && v->cur_field_type == 1)) &&
         !v->s.last_picture.f.data[0])

         return;

 
     mx = s->mv[dir][0][0];
     my = s->mv[dir][0][1];
 
     // store motion vectors for further use in B frames

     if (s->pict_type == AV_PICTURE_TYPE_P) {

         for (i = 0; i < 4; i++) {
             s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][0] = mx;
             s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][1] = my;
         }

     }

     uvmx = (mx + ((mx & 3) == 3)) >> 1;
     uvmy = (my + ((my & 3) == 3)) >> 1;

     v->luma_mv[s->mb_x][0] = uvmx;
     v->luma_mv[s->mb_x][1] = uvmy;

 
     if (v->field_mode &&
         v->cur_field_type != v->ref_field_type[dir]) {

         my   = my   - 2 + 4 * v->cur_field_type;

         uvmy = uvmy - 2 + 4 * v->cur_field_type;
     }
 

     // fastuvmc shall be ignored for interlaced frame picture
     if (v->fastuvmc && (v->fcm != ILACE_FRAME)) {

         uvmx = uvmx + ((uvmx < 0) ? (uvmx & 1) : -(uvmx & 1));
         uvmy = uvmy + ((uvmy < 0) ? (uvmy & 1) : -(uvmy & 1));

     }

     if (!dir) {
         if (v->field_mode && (v->cur_field_type != v->ref_field_type[dir]) && v->second_field) {
             srcY = s->current_picture.f.data[0];
             srcU = s->current_picture.f.data[1];
             srcV = s->current_picture.f.data[2];

             luty  = v->curr_luty;
             lutuv = v->curr_lutuv;

             use_ic = *v->curr_use_ic;

         } else {
             srcY = s->last_picture.f.data[0];
             srcU = s->last_picture.f.data[1];
             srcV = s->last_picture.f.data[2];

             luty  = v->last_luty;
             lutuv = v->last_lutuv;

             use_ic = v->last_use_ic;

         }

     } else {
         srcY = s->next_picture.f.data[0];
         srcU = s->next_picture.f.data[1];
         srcV = s->next_picture.f.data[2];

         luty  = v->next_luty;
         lutuv = v->next_lutuv;

         use_ic = v->next_use_ic;

     }
 

     if (!srcY || !srcU) {
         av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");

         return;

     }

     src_x   = s->mb_x * 16 + (mx   >> 2);
     src_y   = s->mb_y * 16 + (my   >> 2);
     uvsrc_x = s->mb_x *  8 + (uvmx >> 2);
     uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

     if (v->profile != PROFILE_ADVANCED) {

         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);
         src_y   = av_clip(  src_y, -16, s->mb_height * 16);
         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);
         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

     } else {

         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);
         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);
         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);
         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);
     }
 

     srcY += src_y   * s->linesize   + src_x;

     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;
 

     if (v->field_mode && v->ref_field_type[dir]) {
         srcY += s->current_picture_ptr->f.linesize[0];
         srcU += s->current_picture_ptr->f.linesize[1];
         srcV += s->current_picture_ptr->f.linesize[2];
     }
 

     /* for grayscale we should not try to read from unknown area */

     if (s->flags & CODEC_FLAG_GRAY) {

         srcU = s->edge_emu_buffer + 18 * s->linesize;
         srcV = s->edge_emu_buffer + 18 * s->linesize;
     }
 

     if (v->rangeredfrm || use_ic

         || s->h_edge_pos < 22 || v_edge_pos < 22

         || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 16 - s->mspel * 3

         || (unsigned)(src_y - 1)        > v_edge_pos    - (my&3) - 16 - 3) {

         uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;

 
         srcY -= s->mspel * (1 + s->linesize);

         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,
                                  s->linesize, s->linesize,

                                  17 + s->mspel * 2, 17 + s->mspel * 2,
                                  src_x - s->mspel, src_y - s->mspel,
                                  s->h_edge_pos, v_edge_pos);

         srcY = s->edge_emu_buffer;

         s->vdsp.emulated_edge_mc(uvbuf, srcU,
                                  s->uvlinesize, s->uvlinesize,
                                  8 + 1, 8 + 1,

                                  uvsrc_x, uvsrc_y,

                                  s->h_edge_pos >> 1, v_edge_pos >> 1);

         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,
                                  s->uvlinesize, s->uvlinesize,
                                  8 + 1, 8 + 1,

                                  uvsrc_x, uvsrc_y,

                                  s->h_edge_pos >> 1, v_edge_pos >> 1);

         srcU = uvbuf;
         srcV = uvbuf + 16;
         /* if we deal with range reduction we need to scale source blocks */

         if (v->rangeredfrm) {

             int i, j;
             uint8_t *src, *src2;
 
             src = srcY;

             for (j = 0; j < 17 + s->mspel * 2; j++) {
                 for (i = 0; i < 17 + s->mspel * 2; i++)
                     src[i] = ((src[i] - 128) >> 1) + 128;

                 src += s->linesize;
             }

             src  = srcU;
             src2 = srcV;
             for (j = 0; j < 9; j++) {
                 for (i = 0; i < 9; i++) {
                     src[i]  = ((src[i]  - 128) >> 1) + 128;

                     src2[i] = ((src2[i] - 128) >> 1) + 128;
                 }

                 src  += s->uvlinesize;

                 src2 += s->uvlinesize;
             }
         }
         /* if we deal with intensity compensation we need to scale source blocks */

         if (use_ic) {

             int i, j;
             uint8_t *src, *src2;
 
             src = srcY;

             for (j = 0; j < 17 + s->mspel * 2; j++) {

                 int f = v->field_mode ? v->ref_field_type[dir] : ((j + src_y - s->mspel) & 1) ;

                 for (i = 0; i < 17 + s->mspel * 2; i++)

                     src[i] = luty[f][src[i]];

                 src += s->linesize;
             }

             src  = srcU;
             src2 = srcV;
             for (j = 0; j < 9; j++) {

                 int f = v->field_mode ? v->ref_field_type[dir] : ((j + uvsrc_y) & 1);

                 for (i = 0; i < 9; i++) {

                     src[i]  = lutuv[f][src[i]];
                     src2[i] = lutuv[f][src2[i]];

                 }

                 src  += s->uvlinesize;

                 src2 += s->uvlinesize;
             }
         }
         srcY += s->mspel * (1 + s->linesize);
     }
 

     if (s->mspel) {

         dxy = ((my & 3) << 2) | (mx & 3);

         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0]    , srcY    , s->linesize, v->rnd);
         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8, srcY + 8, s->linesize, v->rnd);

         srcY += s->linesize * 8;

         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8 * s->linesize    , srcY    , s->linesize, v->rnd);
         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

     } else { // hpel mc - always used for luma
         dxy = (my & 2) | ((mx & 2) >> 1);

         if (!v->rnd)

             s->hdsp.put_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

         else

             s->hdsp.put_no_rnd_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

     }
 

     if (s->flags & CODEC_FLAG_GRAY) return;

     /* Chroma MC always uses qpel bilinear */

     uvmx = (uvmx & 3) << 1;
     uvmy = (uvmy & 3) << 1;
     if (!v->rnd) {

         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

     } else {

         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

     }
 }
 
 static inline int median4(int a, int b, int c, int d)
 {

     if (a < b) {
         if (c < d) return (FFMIN(b, d) + FFMAX(a, c)) / 2;
         else       return (FFMIN(b, c) + FFMAX(a, d)) / 2;

     } else {

         if (c < d) return (FFMIN(a, d) + FFMAX(b, c)) / 2;
         else       return (FFMIN(a, c) + FFMAX(b, d)) / 2;

     }
 }
 
 /** Do motion compensation for 4-MV macroblock - luminance block
  */

 static void vc1_mc_4mv_luma(VC1Context *v, int n, int dir, int avg)

 {
     MpegEncContext *s = &v->s;
     uint8_t *srcY;
     int dxy, mx, my, src_x, src_y;
     int off;

     int fieldmv = (v->fcm == ILACE_FRAME) ? v->blk_mv_type[s->block_index[n]] : 0;

     int v_edge_pos = s->v_edge_pos >> v->field_mode;

     uint8_t (*luty)[256];

     int use_ic;

     if ((!v->field_mode ||
          (v->ref_field_type[dir] == 1 && v->cur_field_type == 1)) &&
         !v->s.last_picture.f.data[0])

         return;
 

     mx = s->mv[dir][n][0];
     my = s->mv[dir][n][1];
 
     if (!dir) {

         if (v->field_mode && (v->cur_field_type != v->ref_field_type[dir]) && v->second_field) {
             srcY = s->current_picture.f.data[0];

             luty = v->curr_luty;

             use_ic = *v->curr_use_ic;

         } else {

             srcY = s->last_picture.f.data[0];

             luty = v->last_luty;

             use_ic = v->last_use_ic;

         }
     } else {

         srcY = s->next_picture.f.data[0];

         luty = v->next_luty;

         use_ic = v->next_use_ic;

     }

     if (!srcY) {
         av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");

         return;

     }

     if (v->field_mode) {
         if (v->cur_field_type != v->ref_field_type[dir])
             my = my - 2 + 4 * v->cur_field_type;
     }
 
     if (s->pict_type == AV_PICTURE_TYPE_P && n == 3 && v->field_mode) {
         int same_count = 0, opp_count = 0, k;
         int chosen_mv[2][4][2], f;
         int tx, ty;
         for (k = 0; k < 4; k++) {
             f = v->mv_f[0][s->block_index[k] + v->blocks_off];
             chosen_mv[f][f ? opp_count : same_count][0] = s->mv[0][k][0];
             chosen_mv[f][f ? opp_count : same_count][1] = s->mv[0][k][1];

             opp_count  += f;

             same_count += 1 - f;
         }
         f = opp_count > same_count;
         switch (f ? opp_count : same_count) {
         case 4:

             tx = median4(chosen_mv[f][0][0], chosen_mv[f][1][0],
                          chosen_mv[f][2][0], chosen_mv[f][3][0]);
             ty = median4(chosen_mv[f][0][1], chosen_mv[f][1][1],
                          chosen_mv[f][2][1], chosen_mv[f][3][1]);

             break;
         case 3:
             tx = mid_pred(chosen_mv[f][0][0], chosen_mv[f][1][0], chosen_mv[f][2][0]);
             ty = mid_pred(chosen_mv[f][0][1], chosen_mv[f][1][1], chosen_mv[f][2][1]);
             break;
         case 2:
             tx = (chosen_mv[f][0][0] + chosen_mv[f][1][0]) / 2;
             ty = (chosen_mv[f][0][1] + chosen_mv[f][1][1]) / 2;
             break;

         default:

             av_assert0(0);

         }

         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;
         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;

         for (k = 0; k < 4; k++)
             v->mv_f[1][s->block_index[k] + v->blocks_off] = f;

     }
 

     if (v->fcm == ILACE_FRAME) {  // not sure if needed for other types of picture

         int qx, qy;

         int width  = s->avctx->coded_width;

         int height = s->avctx->coded_height >> 1;

         if (s->pict_type == AV_PICTURE_TYPE_P) {
             s->current_picture.motion_val[1][s->block_index[n] + v->blocks_off][0] = mx;
             s->current_picture.motion_val[1][s->block_index[n] + v->blocks_off][1] = my;
         }

         qx = (s->mb_x * 16) + (mx >> 2);
         qy = (s->mb_y *  8) + (my >> 3);
 
         if (qx < -17)
             mx -= 4 * (qx + 17);
         else if (qx > width)
             mx -= 4 * (qx - width);
         if (qy < -18)
             my -= 8 * (qy + 18);
         else if (qy > height + 1)
             my -= 8 * (qy - height - 1);
     }
 

     if ((v->fcm == ILACE_FRAME) && fieldmv)

         off = ((n > 1) ? s->linesize : 0) + (n & 1) * 8;

     else

         off = s->linesize * 4 * (n & 2) + (n & 1) * 8;

     src_x = s->mb_x * 16 + (n & 1) * 8 + (mx >> 2);

     if (!fieldmv)

         src_y = s->mb_y * 16 + (n & 2) * 4 + (my >> 2);

     else
         src_y = s->mb_y * 16 + ((n > 1) ? 1 : 0) + (my >> 2);

     if (v->profile != PROFILE_ADVANCED) {
         src_x = av_clip(src_x, -16, s->mb_width  * 16);
         src_y = av_clip(src_y, -16, s->mb_height * 16);
     } else {
         src_x = av_clip(src_x, -17, s->avctx->coded_width);

         if (v->fcm == ILACE_FRAME) {

             if (src_y & 1)

                 src_y = av_clip(src_y, -17, s->avctx->coded_height + 1);

             else

                 src_y = av_clip(src_y, -18, s->avctx->coded_height);

         } else {

             src_y = av_clip(src_y, -18, s->avctx->coded_height + 1);

         }

     }
 
     srcY += src_y * s->linesize + src_x;

     if (v->field_mode && v->ref_field_type[dir])
         srcY += s->current_picture_ptr->f.linesize[0];

     if (fieldmv && !(src_y & 1))
         v_edge_pos--;
     if (fieldmv && (src_y & 1) && src_y < 4)
         src_y--;

     if (v->rangeredfrm || use_ic

         || s->h_edge_pos < 13 || v_edge_pos < 23

         || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx & 3) - 8 - s->mspel * 2
         || (unsigned)(src_y - (s->mspel << fieldmv)) > v_edge_pos - (my & 3) - ((8 + s->mspel * 2) << fieldmv)) {

         srcY -= s->mspel * (1 + (s->linesize << fieldmv));
         /* check emulate edge stride and offset */

         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,
                                  s->linesize, s->linesize,

                                  9 + s->mspel * 2, (9 + s->mspel * 2) << fieldmv,
                                  src_x - s->mspel, src_y - (s->mspel << fieldmv),
                                  s->h_edge_pos, v_edge_pos);

         srcY = s->edge_emu_buffer;
         /* if we deal with range reduction we need to scale source blocks */

         if (v->rangeredfrm) {

             int i, j;
             uint8_t *src;
 
             src = srcY;

             for (j = 0; j < 9 + s->mspel * 2; j++) {
                 for (i = 0; i < 9 + s->mspel * 2; i++)
                     src[i] = ((src[i] - 128) >> 1) + 128;

                 src += s->linesize << fieldmv;

             }
         }
         /* if we deal with intensity compensation we need to scale source blocks */

         if (use_ic) {

             int i, j;
             uint8_t *src;
 
             src = srcY;

             for (j = 0; j < 9 + s->mspel * 2; j++) {

                 int f = v->field_mode ? v->ref_field_type[dir] : (((j<<fieldmv)+src_y - (s->mspel << fieldmv)) & 1);

                 for (i = 0; i < 9 + s->mspel * 2; i++)

                     src[i] = luty[f][src[i]];

                 src += s->linesize << fieldmv;

             }
         }

         srcY += s->mspel * (1 + (s->linesize << fieldmv));

     }
 

     if (s->mspel) {

         dxy = ((my & 3) << 2) | (mx & 3);

         if (avg)
             v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize << fieldmv, v->rnd);
         else
             v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize << fieldmv, v->rnd);

     } else { // hpel mc - always used for luma
         dxy = (my & 2) | ((mx & 2) >> 1);

         if (!v->rnd)

             s->hdsp.put_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

         else

             s->hdsp.put_no_rnd_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

     }
 }
 

 static av_always_inline int get_chroma_mv(int *mvx, int *mvy, int *a, int flag, int *tx, int *ty)

 {

     int idx, i;
     static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

 
     idx =  ((a[3] != flag) << 3)
          | ((a[2] != flag) << 2)
          | ((a[1] != flag) << 1)
          |  (a[0] != flag);
     if (!idx) {

         *tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);
         *ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);
         return 4;

     } else if (count[idx] == 1) {
         switch (idx) {

         case 0x1:
             *tx = mid_pred(mvx[1], mvx[2], mvx[3]);
             *ty = mid_pred(mvy[1], mvy[2], mvy[3]);
             return 3;
         case 0x2:
             *tx = mid_pred(mvx[0], mvx[2], mvx[3]);
             *ty = mid_pred(mvy[0], mvy[2], mvy[3]);
             return 3;
         case 0x4:
             *tx = mid_pred(mvx[0], mvx[1], mvx[3]);
             *ty = mid_pred(mvy[0], mvy[1], mvy[3]);
             return 3;
         case 0x8:
             *tx = mid_pred(mvx[0], mvx[1], mvx[2]);
             *ty = mid_pred(mvy[0], mvy[1], mvy[2]);
             return 3;
         }

     } else if (count[idx] == 2) {

         int t1 = 0, t2 = 0;
         for (i = 0; i < 3; i++)
             if (!a[i]) {
                 t1 = i;
                 break;
             }
         for (i = t1 + 1; i < 4; i++)
             if (!a[i]) {
                 t2 = i;
                 break;
             }
         *tx = (mvx[t1] + mvx[t2]) / 2;
         *ty = (mvy[t1] + mvy[t2]) / 2;
         return 2;

     } else {

         return 0;

     }

     return -1;

 }
 
 /** Do motion compensation for 4-MV macroblock - both chroma blocks
  */

 static void vc1_mc_4mv_chroma(VC1Context *v, int dir)

 {
     MpegEncContext *s = &v->s;

     H264ChromaContext *h264chroma = &v->h264chroma;

     uint8_t *srcU, *srcV;
     int uvmx, uvmy, uvsrc_x, uvsrc_y;

     int k, tx = 0, ty = 0;
     int mvx[4], mvy[4], intra[4], mv_f[4];
     int valid_count;

     int chroma_ref_type = v->cur_field_type;

     int v_edge_pos = s->v_edge_pos >> v->field_mode;

     uint8_t (*lutuv)[256];

     int use_ic;

     if (!v->field_mode && !v->s.last_picture.f.data[0])
         return;
     if (s->flags & CODEC_FLAG_GRAY)
         return;

     for (k = 0; k < 4; k++) {

         mvx[k] = s->mv[dir][k][0];
         mvy[k] = s->mv[dir][k][1];
         intra[k] = v->mb_type[0][s->block_index[k]];
         if (v->field_mode)
             mv_f[k] = v->mv_f[dir][s->block_index[k] + v->blocks_off];

     }
 
     /* calculate chroma MV vector from four luma MVs */

     if (!v->field_mode || (v->field_mode && !v->numref)) {
         valid_count = get_chroma_mv(mvx, mvy, intra, 0, &tx, &ty);

         chroma_ref_type = v->reffield;

         if (!valid_count) {

             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;

             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;
             return; //no need to do MC for intra blocks

         }
     } else {

         int dominant = 0;
         if (mv_f[0] + mv_f[1] + mv_f[2] + mv_f[3] > 2)
             dominant = 1;
         valid_count = get_chroma_mv(mvx, mvy, mv_f, dominant, &tx, &ty);
         if (dominant)
             chroma_ref_type = !v->cur_field_type;

     }

     if (v->field_mode && chroma_ref_type == 1 && v->cur_field_type == 1 && !v->s.last_picture.f.data[0])
         return;

     s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;
     s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;

     uvmx = (tx + ((tx & 3) == 3)) >> 1;
     uvmy = (ty + ((ty & 3) == 3)) >> 1;

     v->luma_mv[s->mb_x][0] = uvmx;
     v->luma_mv[s->mb_x][1] = uvmy;

     if (v->fastuvmc) {
         uvmx = uvmx + ((uvmx < 0) ? (uvmx & 1) : -(uvmx & 1));
         uvmy = uvmy + ((uvmy < 0) ? (uvmy & 1) : -(uvmy & 1));

     }

     // Field conversion bias
     if (v->cur_field_type != chroma_ref_type)
         uvmy += 2 - 4 * chroma_ref_type;

 
     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);
     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);
 

     if (v->profile != PROFILE_ADVANCED) {
         uvsrc_x = av_clip(uvsrc_x, -8, s->mb_width  * 8);
         uvsrc_y = av_clip(uvsrc_y, -8, s->mb_height * 8);
     } else {
         uvsrc_x = av_clip(uvsrc_x, -8, s->avctx->coded_width  >> 1);
         uvsrc_y = av_clip(uvsrc_y, -8, s->avctx->coded_height >> 1);

     }
 

     if (!dir) {

         if (v->field_mode && (v->cur_field_type != chroma_ref_type) && v->second_field) {

             srcU = s->current_picture.f.data[1];
             srcV = s->current_picture.f.data[2];

             lutuv = v->curr_lutuv;

             use_ic = *v->curr_use_ic;

         } else {

             srcU = s->last_picture.f.data[1];
             srcV = s->last_picture.f.data[2];

             lutuv = v->last_lutuv;

             use_ic = v->last_use_ic;

         }
     } else {

         srcU = s->next_picture.f.data[1];
         srcV = s->next_picture.f.data[2];

         lutuv = v->next_lutuv;

         use_ic = v->next_use_ic;

     }
 

     if (!srcU) {
         av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");

         return;

     }

     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;
 

     if (v->field_mode) {
         if (chroma_ref_type) {
             srcU += s->current_picture_ptr->f.linesize[1];
             srcV += s->current_picture_ptr->f.linesize[2];
         }
     }
 

     if (v->rangeredfrm || use_ic

         || s->h_edge_pos < 18 || v_edge_pos < 18

         || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9
         || (unsigned)uvsrc_y > (v_edge_pos    >> 1) - 9) {

         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcU,
                                  s->uvlinesize, s->uvlinesize,

                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,
                                  s->h_edge_pos >> 1, v_edge_pos >> 1);

         s->vdsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV,
                                  s->uvlinesize, s->uvlinesize,

                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,
                                  s->h_edge_pos >> 1, v_edge_pos >> 1);

         srcU = s->edge_emu_buffer;
         srcV = s->edge_emu_buffer + 16;
 
         /* if we deal with range reduction we need to scale source blocks */

         if (v->rangeredfrm) {

             int i, j;
             uint8_t *src, *src2;
 

             src  = srcU;
             src2 = srcV;
             for (j = 0; j < 9; j++) {
                 for (i = 0; i < 9; i++) {
                     src[i]  = ((src[i]  - 128) >> 1) + 128;

                     src2[i] = ((src2[i] - 128) >> 1) + 128;
                 }

                 src  += s->uvlinesize;

                 src2 += s->uvlinesize;
             }
         }
         /* if we deal with intensity compensation we need to scale source blocks */

         if (use_ic) {

             int i, j;
             uint8_t *src, *src2;
 

             src  = srcU;
             src2 = srcV;
             for (j = 0; j < 9; j++) {

                 int f = v->field_mode ? chroma_ref_type : ((j + uvsrc_y) & 1);

                 for (i = 0; i < 9; i++) {

                     src[i]  = lutuv[f][src[i]];
                     src2[i] = lutuv[f][src2[i]];

                 }

                 src  += s->uvlinesize;

                 src2 += s->uvlinesize;
             }
         }
     }
 
     /* Chroma MC always uses qpel bilinear */

     uvmx = (uvmx & 3) << 1;
     uvmy = (uvmy & 3) << 1;
     if (!v->rnd) {

         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

     } else {

         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

     }
 }
 

 /** Do motion compensation for 4-MV interlaced frame chroma macroblock (both U and V)

  */

 static void vc1_mc_4mv_chroma4(VC1Context *v, int dir, int dir2, int avg)

 {
     MpegEncContext *s = &v->s;

     H264ChromaContext *h264chroma = &v->h264chroma;

     uint8_t *srcU, *srcV;
     int uvsrc_x, uvsrc_y;
     int uvmx_field[4], uvmy_field[4];
     int i, off, tx, ty;
     int fieldmv = v->blk_mv_type[s->block_index[0]];

     static const int s_rndtblfield[16] = { 0, 0, 1, 2, 4, 4, 5, 6, 2, 2, 3, 8, 6, 6, 7, 12 };

     int v_dist = fieldmv ? 1 : 4; // vertical offset for lower sub-blocks
     int v_edge_pos = s->v_edge_pos >> 1;

     int use_ic;
     uint8_t (*lutuv)[256];

     if (s->flags & CODEC_FLAG_GRAY)
         return;

 
     for (i = 0; i < 4; i++) {

         int d = i < 2 ? dir: dir2;

         tx = s->mv[d][i][0];

         uvmx_field[i] = (tx + ((tx & 3) == 3)) >> 1;

         ty = s->mv[d][i][1];

         if (fieldmv)
             uvmy_field[i] = (ty >> 4) * 8 + s_rndtblfield[ty & 0xF];
         else
             uvmy_field[i] = (ty + ((ty & 3) == 3)) >> 1;
     }
 
     for (i = 0; i < 4; i++) {
         off = (i & 1) * 4 + ((i & 2) ? v_dist * s->uvlinesize : 0);

         uvsrc_x = s->mb_x * 8 +  (i & 1) * 4           + (uvmx_field[i] >> 2);

         uvsrc_y = s->mb_y * 8 + ((i & 2) ? v_dist : 0) + (uvmy_field[i] >> 2);
         // FIXME: implement proper pull-back (see vc1cropmv.c, vc1CROPMV_ChromaPullBack())

         uvsrc_x = av_clip(uvsrc_x, -8, s->avctx->coded_width  >> 1);
         uvsrc_y = av_clip(uvsrc_y, -8, s->avctx->coded_height >> 1);

         if (i < 2 ? dir : dir2) {

             srcU = s->next_picture.f.data[1];
             srcV = s->next_picture.f.data[2];

             lutuv  = v->next_lutuv;
             use_ic = v->next_use_ic;
         } else {

             srcU = s->last_picture.f.data[1];
             srcV = s->last_picture.f.data[2];

             lutuv  = v->last_lutuv;
             use_ic = v->last_use_ic;
         }

         if (!srcU)
             return;
         srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
         srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

         uvmx_field[i] = (uvmx_field[i] & 3) << 1;
         uvmy_field[i] = (uvmy_field[i] & 3) << 1;
 
         if (fieldmv && !(uvsrc_y & 1))

             v_edge_pos = (s->v_edge_pos >> 1) - 1;
 

         if (fieldmv && (uvsrc_y & 1) && uvsrc_y < 2)
             uvsrc_y--;

         if (use_ic

             || s->h_edge_pos < 10 || v_edge_pos < (5 << fieldmv)

             || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 5

             || (unsigned)uvsrc_y > v_edge_pos - (5 << fieldmv)) {

             s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcU,
                                      s->uvlinesize, s->uvlinesize,

                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,
                                      s->h_edge_pos >> 1, v_edge_pos);

             s->vdsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV,
                                      s->uvlinesize, s->uvlinesize,

                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,
                                      s->h_edge_pos >> 1, v_edge_pos);

             srcU = s->edge_emu_buffer;
             srcV = s->edge_emu_buffer + 16;
 
             /* if we deal with intensity compensation we need to scale source blocks */

             if (use_ic) {

                 int i, j;
                 uint8_t *src, *src2;
 

                 src  = srcU;
                 src2 = srcV;
                 for (j = 0; j < 5; j++) {

                     int f = (uvsrc_y + (j << fieldmv)) & 1;

                     for (i = 0; i < 5; i++) {

                         src[i]  = lutuv[f][src[i]];
                         src2[i] = lutuv[f][src2[i]];

                     }

                     src  += s->uvlinesize << fieldmv;
                     src2 += s->uvlinesize << fieldmv;

                 }
             }
         }

         if (avg) {
             if (!v->rnd) {
                 h264chroma->avg_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
                 h264chroma->avg_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
             } else {
                 v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
                 v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
             }
         } else {

             if (!v->rnd) {
                 h264chroma->put_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
                 h264chroma->put_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
             } else {
                 v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
                 v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
             }

         }

     }
 }
 
 /***********************************************************************/
 /**

  * @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 {

         av_assert0(index < esc);

         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;
     }
 }
 
 static av_always_inline int scaleforsame_x(VC1Context *v, int n /* MV */, int dir)
 {
     int scaledvalue, refdist;
     int scalesame1, scalesame2;
     int scalezone1_x, zone1offset_x;

     int table_index = dir ^ v->second_field;

 
     if (v->s.pict_type != AV_PICTURE_TYPE_B)
         refdist = v->refdist;
     else
         refdist = dir ? v->brfd : v->frfd;
     if (refdist > 3)
         refdist = 3;

     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];
     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];
     scalezone1_x  = ff_vc1_field_mvpred_scales[table_index][3][refdist];
     zone1offset_x = ff_vc1_field_mvpred_scales[table_index][5][refdist];

 
     if (FFABS(n) > 255)
         scaledvalue = n;
     else {
         if (FFABS(n) < scalezone1_x)
             scaledvalue = (n * scalesame1) >> 8;
         else {
             if (n < 0)
                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_x;
             else
                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_x;
         }
     }
     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);
 }
 
 static av_always_inline int scaleforsame_y(VC1Context *v, int i, int n /* MV */, int dir)
 {
     int scaledvalue, refdist;
     int scalesame1, scalesame2;
     int scalezone1_y, zone1offset_y;

     int table_index = dir ^ v->second_field;

 
     if (v->s.pict_type != AV_PICTURE_TYPE_B)
         refdist = v->refdist;
     else
         refdist = dir ? v->brfd : v->frfd;
     if (refdist > 3)
         refdist = 3;

     scalesame1    = ff_vc1_field_mvpred_scales[table_index][1][refdist];
     scalesame2    = ff_vc1_field_mvpred_scales[table_index][2][refdist];
     scalezone1_y  = ff_vc1_field_mvpred_scales[table_index][4][refdist];
     zone1offset_y = ff_vc1_field_mvpred_scales[table_index][6][refdist];

 
     if (FFABS(n) > 63)
         scaledvalue = n;
     else {
         if (FFABS(n) < scalezone1_y)
             scaledvalue = (n * scalesame1) >> 8;
         else {
             if (n < 0)
                 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_y;
             else
                 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_y;
         }
     }
 
     if (v->cur_field_type && !v->ref_field_type[dir])
         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);
     else
         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);
 }
 
 static av_always_inline int scaleforopp_x(VC1Context *v, int n /* MV */)
 {
     int scalezone1_x, zone1offset_x;
     int scaleopp1, scaleopp2, brfd;
     int scaledvalue;
 
     brfd = FFMIN(v->brfd, 3);

     scalezone1_x  = ff_vc1_b_field_mvpred_scales[3][brfd];
     zone1offset_x = ff_vc1_b_field_mvpred_scales[5][brfd];
     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];
     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

 
     if (FFABS(n) > 255)
         scaledvalue = n;
     else {
         if (FFABS(n) < scalezone1_x)
             scaledvalue = (n * scaleopp1) >> 8;
         else {
             if (n < 0)
                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_x;
             else
                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_x;
         }
     }
     return av_clip(scaledvalue, -v->range_x, v->range_x - 1);
 }
 
 static av_always_inline int scaleforopp_y(VC1Context *v, int n /* MV */, int dir)
 {
     int scalezone1_y, zone1offset_y;
     int scaleopp1, scaleopp2, brfd;
     int scaledvalue;
 
     brfd = FFMIN(v->brfd, 3);

     scalezone1_y  = ff_vc1_b_field_mvpred_scales[4][brfd];
     zone1offset_y = ff_vc1_b_field_mvpred_scales[6][brfd];
     scaleopp1     = ff_vc1_b_field_mvpred_scales[1][brfd];
     scaleopp2     = ff_vc1_b_field_mvpred_scales[2][brfd];

 
     if (FFABS(n) > 63)
         scaledvalue = n;
     else {
         if (FFABS(n) < scalezone1_y)
             scaledvalue = (n * scaleopp1) >> 8;
         else {
             if (n < 0)
                 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_y;
             else
                 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_y;
         }
     }
     if (v->cur_field_type && !v->ref_field_type[dir]) {
         return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);
     } else {
         return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);
     }
 }
 

 static av_always_inline int scaleforsame(VC1Context *v, int i, int n /* MV */,
                                          int dim, int dir)

 {
     int brfd, scalesame;

     int hpel = 1 - v->s.quarter_sample;

     n >>= hpel;

     if (v->s.pict_type != AV_PICTURE_TYPE_B || v->second_field || !dir) {
         if (dim)

             n = scaleforsame_y(v, i, n, dir) << hpel;

         else

             n = scaleforsame_x(v, n, dir) << hpel;
         return n;

     }

     brfd      = FFMIN(v->brfd, 3);

     scalesame = ff_vc1_b_field_mvpred_scales[0][brfd];

     n = (n * scalesame >> 8) << hpel;
     return n;

 }
 

 static av_always_inline int scaleforopp(VC1Context *v, int n /* MV */,
                                         int dim, int dir)

 {
     int refdist, scaleopp;

     int hpel = 1 - v->s.quarter_sample;

     n >>= hpel;

     if (v->s.pict_type == AV_PICTURE_TYPE_B && !v->second_field && dir == 1) {
         if (dim)

             n = scaleforopp_y(v, n, dir) << hpel;

         else

             n = scaleforopp_x(v, n) << hpel;
         return n;

     }
     if (v->s.pict_type != AV_PICTURE_TYPE_B)
         refdist = FFMIN(v->refdist, 3);
     else
         refdist = dir ? v->brfd : v->frfd;

     scaleopp = ff_vc1_field_mvpred_scales[dir ^ v->second_field][0][refdist];

     n = (n * scaleopp >> 8) << hpel;
     return n;

 }
 

 /** Predict and set motion vector
  */

 static inline void vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,
                                int mv1, int r_x, int r_y, uint8_t* is_intra,
                                int pred_flag, int dir)

 {

     MpegEncContext *s = &v->s;

     int xy, wrap, off = 0;
     int16_t *A, *B, *C;
     int px, py;
     int sum;

     int mixedmv_pic, num_samefield = 0, num_oppfield = 0;

     int opposite, a_f, b_f, c_f;

     int16_t field_predA[2];
     int16_t field_predB[2];
     int16_t field_predC[2];

     int a_valid, b_valid, c_valid;
     int hybridmv_thresh, y_bias = 0;
 
     if (v->mv_mode == MV_PMODE_MIXED_MV ||

         ((v->mv_mode == MV_PMODE_INTENSITY_COMP) && (v->mv_mode2 == MV_PMODE_MIXED_MV)))
         mixedmv_pic = 1;
     else
         mixedmv_pic = 0;

     /* scale MV difference to be quad-pel */
     dmv_x <<= 1 - s->quarter_sample;
     dmv_y <<= 1 - s->quarter_sample;
 
     wrap = s->b8_stride;

     xy   = s->block_index[n];

     if (s->mb_intra) {

         s->mv[0][n][0] = s->current_picture.motion_val[0][xy + v->blocks_off][0] = 0;
         s->mv[0][n][1] = s->current_picture.motion_val[0][xy + v->blocks_off][1] = 0;
         s->current_picture.motion_val[1][xy + v->blocks_off][0] = 0;
         s->current_picture.motion_val[1][xy + v->blocks_off][1] = 0;

         if (mv1) { /* duplicate motion data for 1-MV block */

             s->current_picture.motion_val[0][xy + 1 + v->blocks_off][0]        = 0;
             s->current_picture.motion_val[0][xy + 1 + v->blocks_off][1]        = 0;
             s->current_picture.motion_val[0][xy + wrap + v->blocks_off][0]     = 0;
             s->current_picture.motion_val[0][xy + wrap + v->blocks_off][1]     = 0;
             s->current_picture.motion_val[0][xy + wrap + 1 + v->blocks_off][0] = 0;
             s->current_picture.motion_val[0][xy + wrap + 1 + v->blocks_off][1] = 0;

             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

             s->current_picture.motion_val[1][xy + 1 + v->blocks_off][0]        = 0;
             s->current_picture.motion_val[1][xy + 1 + v->blocks_off][1]        = 0;
             s->current_picture.motion_val[1][xy + wrap][0]                     = 0;
             s->current_picture.motion_val[1][xy + wrap + v->blocks_off][1]     = 0;
             s->current_picture.motion_val[1][xy + wrap + 1 + v->blocks_off][0] = 0;
             s->current_picture.motion_val[1][xy + wrap + 1 + v->blocks_off][1] = 0;

         }
         return;
     }
 

     C = s->current_picture.motion_val[dir][xy -    1 + v->blocks_off];
     A = s->current_picture.motion_val[dir][xy - wrap + v->blocks_off];

     if (mv1) {

         if (v->field_mode && mixedmv_pic)
             off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;
         else
             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;
     } else {

         //in 4-MV mode different blocks have different B predictor position

         switch (n) {

         case 0:
             off = (s->mb_x > 0) ? -1 : 1;
             break;
         case 1:
             off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;
             break;
         case 2:
             off = 1;
             break;
         case 3:
             off = -1;
         }
     }

     B = s->current_picture.motion_val[dir][xy - wrap + off + v->blocks_off];

     a_valid = !s->first_slice_line || (n == 2 || n == 3);

     b_valid = a_valid && (s->mb_width > 1);

     c_valid = s->mb_x || (n == 1 || n == 3);

     if (v->field_mode) {
         a_valid = a_valid && !is_intra[xy - wrap];
         b_valid = b_valid && !is_intra[xy - wrap + off];
         c_valid = c_valid && !is_intra[xy - 1];
     }
 
     if (a_valid) {

         a_f = v->mv_f[dir][xy - wrap + v->blocks_off];
         num_oppfield  += a_f;
         num_samefield += 1 - a_f;
         field_predA[0] = A[0];
         field_predA[1] = A[1];

     } else {

         field_predA[0] = field_predA[1] = 0;
         a_f = 0;

     }
     if (b_valid) {

         b_f = v->mv_f[dir][xy - wrap + off + v->blocks_off];
         num_oppfield  += b_f;
         num_samefield += 1 - b_f;
         field_predB[0] = B[0];
         field_predB[1] = B[1];

     } else {

         field_predB[0] = field_predB[1] = 0;
         b_f = 0;

     }

     if (c_valid) {
         c_f = v->mv_f[dir][xy - 1 + v->blocks_off];
         num_oppfield  += c_f;
         num_samefield += 1 - c_f;
         field_predC[0] = C[0];
         field_predC[1] = C[1];

     } else {

         field_predC[0] = field_predC[1] = 0;
         c_f = 0;

     }
 
     if (v->field_mode) {

         if (!v->numref)
             // REFFIELD determines if the last field or the second-last field is
             // to be used as reference
             opposite = 1 - v->reffield;
         else {
             if (num_samefield <= num_oppfield)
                 opposite = 1 - pred_flag;
             else
                 opposite = pred_flag;
         }

     } else

         opposite = 0;
     if (opposite) {

         if (a_valid && !a_f) {
             field_predA[0] = scaleforopp(v, field_predA[0], 0, dir);
             field_predA[1] = scaleforopp(v, field_predA[1], 1, dir);
         }
         if (b_valid && !b_f) {
             field_predB[0] = scaleforopp(v, field_predB[0], 0, dir);
             field_predB[1] = scaleforopp(v, field_predB[1], 1, dir);
         }
         if (c_valid && !c_f) {
             field_predC[0] = scaleforopp(v, field_predC[0], 0, dir);
             field_predC[1] = scaleforopp(v, field_predC[1], 1, dir);
         }
         v->mv_f[dir][xy + v->blocks_off] = 1;

         v->ref_field_type[dir] = !v->cur_field_type;
     } else {

         if (a_valid && a_f) {
             field_predA[0] = scaleforsame(v, n, field_predA[0], 0, dir);
             field_predA[1] = scaleforsame(v, n, field_predA[1], 1, dir);
         }
         if (b_valid && b_f) {
             field_predB[0] = scaleforsame(v, n, field_predB[0], 0, dir);
             field_predB[1] = scaleforsame(v, n, field_predB[1], 1, dir);
         }
         if (c_valid && c_f) {
             field_predC[0] = scaleforsame(v, n, field_predC[0], 0, dir);
             field_predC[1] = scaleforsame(v, n, field_predC[1], 1, dir);
         }
         v->mv_f[dir][xy + v->blocks_off] = 0;

         v->ref_field_type[dir] = v->cur_field_type;

     }

     if (a_valid) {
         px = field_predA[0];
         py = field_predA[1];
     } else if (c_valid) {
         px = field_predC[0];
         py = field_predC[1];
     } else if (b_valid) {
         px = field_predB[0];
         py = field_predB[1];
     } else {
         px = 0;
         py = 0;
     }
 
     if (num_samefield + num_oppfield > 1) {
         px = mid_pred(field_predA[0], field_predB[0], field_predC[0]);
         py = mid_pred(field_predA[1], field_predB[1], field_predC[1]);
     }
 

     /* Pullback MV as specified in 8.3.5.3.4 */

     if (!v->field_mode) {

         int qx, qy, X, Y;

         qx = (s->mb_x << 6) + ((n == 1 || n == 3) ? 32 : 0);
         qy = (s->mb_y << 6) + ((n == 2 || n == 3) ? 32 : 0);
         X  = (s->mb_width  << 6) - 4;
         Y  = (s->mb_height << 6) - 4;
         if (mv1) {
             if (qx + px < -60) px = -60 - qx;
             if (qy + py < -60) py = -60 - qy;

         } else {

             if (qx + px < -28) px = -28 - qx;
             if (qy + py < -28) py = -28 - qy;

         }

         if (qx + px > X) px = X - qx;
         if (qy + py > Y) py = Y - qy;

     }

 
     if (!v->field_mode || s->pict_type != AV_PICTURE_TYPE_B) {
         /* Calculate hybrid prediction as specified in 8.3.5.3.5 (also 10.3.5.4.3.5) */

         hybridmv_thresh = 32;

         if (a_valid && c_valid) {
             if (is_intra[xy - wrap])
                 sum = FFABS(px) + FFABS(py);
             else

                 sum = FFABS(px - field_predA[0]) + FFABS(py - field_predA[1]);

             if (sum > hybridmv_thresh) {
                 if (get_bits1(&s->gb)) {     // read HYBRIDPRED bit

                     px = field_predA[0];
                     py = field_predA[1];

                 } else {

                     px = field_predC[0];
                     py = field_predC[1];

                 }

             } else {

                 if (is_intra[xy - 1])
                     sum = FFABS(px) + FFABS(py);
                 else

                     sum = FFABS(px - field_predC[0]) + FFABS(py - field_predC[1]);

                 if (sum > hybridmv_thresh) {

                     if (get_bits1(&s->gb)) {

                         px = field_predA[0];
                         py = field_predA[1];

                     } else {

                         px = field_predC[0];
                         py = field_predC[1];

                     }
                 }
             }
         }
     }
 
     if (v->field_mode && v->numref)
         r_y >>= 1;
     if (v->field_mode && v->cur_field_type && v->ref_field_type[dir] == 0)
         y_bias = 1;
     /* store MV using signed modulus of MV range defined in 4.11 */

     s->mv[dir][n][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;
     s->mv[dir][n][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1] = ((py + dmv_y + r_y - y_bias) & ((r_y << 1) - 1)) - r_y + y_bias;

     if (mv1) { /* duplicate motion data for 1-MV block */

         s->current_picture.motion_val[dir][xy +    1 +     v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];
         s->current_picture.motion_val[dir][xy +    1 +     v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];
         s->current_picture.motion_val[dir][xy + wrap +     v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];
         s->current_picture.motion_val[dir][xy + wrap +     v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];
         s->current_picture.motion_val[dir][xy + wrap + 1 + v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];
         s->current_picture.motion_val[dir][xy + wrap + 1 + v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];

         v->mv_f[dir][xy +    1 + v->blocks_off] = v->mv_f[dir][xy +            v->blocks_off];

         v->mv_f[dir][xy + wrap + v->blocks_off] = v->mv_f[dir][xy + wrap + 1 + v->blocks_off] = v->mv_f[dir][xy + v->blocks_off];
     }
 }
 
 /** Predict and set motion vector for interlaced frame picture MBs
  */

 static inline void vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,

                                      int mvn, int r_x, int r_y, uint8_t* is_intra, int dir)

 {
     MpegEncContext *s = &v->s;
     int xy, wrap, off = 0;
     int A[2], B[2], C[2];

     int px = 0, py = 0;

     int a_valid = 0, b_valid = 0, c_valid = 0;
     int field_a, field_b, field_c; // 0: same, 1: opposit
     int total_valid, num_samefield, num_oppfield;
     int pos_c, pos_b, n_adj;
 
     wrap = s->b8_stride;
     xy = s->block_index[n];
 

     if (s->mb_intra) {

         s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;
         s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;
         s->current_picture.motion_val[1][xy][0] = 0;
         s->current_picture.motion_val[1][xy][1] = 0;

         if (mvn == 1) { /* duplicate motion data for 1-MV block */

             s->current_picture.motion_val[0][xy + 1][0]        = 0;
             s->current_picture.motion_val[0][xy + 1][1]        = 0;
             s->current_picture.motion_val[0][xy + wrap][0]     = 0;
             s->current_picture.motion_val[0][xy + wrap][1]     = 0;
             s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;
             s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;

             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

             s->current_picture.motion_val[1][xy + 1][0]        = 0;
             s->current_picture.motion_val[1][xy + 1][1]        = 0;
             s->current_picture.motion_val[1][xy + wrap][0]     = 0;
             s->current_picture.motion_val[1][xy + wrap][1]     = 0;
             s->current_picture.motion_val[1][xy + wrap + 1][0] = 0;
             s->current_picture.motion_val[1][xy + wrap + 1][1] = 0;

         }
         return;
     }
 
     off = ((n == 0) || (n == 1)) ? 1 : -1;
     /* predict A */
     if (s->mb_x || (n == 1) || (n == 3)) {
         if ((v->blk_mv_type[xy]) // current block (MB) has a field MV

             || (!v->blk_mv_type[xy] && !v->blk_mv_type[xy - 1])) { // or both have frame MV

             A[0] = s->current_picture.motion_val[dir][xy - 1][0];
             A[1] = s->current_picture.motion_val[dir][xy - 1][1];

             a_valid = 1;
         } else { // current block has frame mv and cand. has field MV (so average)

             A[0] = (s->current_picture.motion_val[dir][xy - 1][0]
                     + s->current_picture.motion_val[dir][xy - 1 + off * wrap][0] + 1) >> 1;
             A[1] = (s->current_picture.motion_val[dir][xy - 1][1]
                     + s->current_picture.motion_val[dir][xy - 1 + off * wrap][1] + 1) >> 1;

             a_valid = 1;
         }
         if (!(n & 1) && v->is_intra[s->mb_x - 1]) {
             a_valid = 0;
             A[0] = A[1] = 0;
         }

     } else
         A[0] = A[1] = 0;

     /* Predict B and C */
     B[0] = B[1] = C[0] = C[1] = 0;
     if (n == 0 || n == 1 || v->blk_mv_type[xy]) {
         if (!s->first_slice_line) {
             if (!v->is_intra[s->mb_x - s->mb_stride]) {
                 b_valid = 1;

                 n_adj   = n | 2;
                 pos_b   = s->block_index[n_adj] - 2 * wrap;

                 if (v->blk_mv_type[pos_b] && v->blk_mv_type[xy]) {
                     n_adj = (n & 2) | (n & 1);
                 }

                 B[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap][0];
                 B[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap][1];

                 if (v->blk_mv_type[pos_b] && !v->blk_mv_type[xy]) {

                     B[0] = (B[0] + s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap][0] + 1) >> 1;
                     B[1] = (B[1] + s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap][1] + 1) >> 1;

                 }

             }

             if (s->mb_width > 1) {
                 if (!v->is_intra[s->mb_x - s->mb_stride + 1]) {
                     c_valid = 1;

                     n_adj   = 2;
                     pos_c   = s->block_index[2] - 2 * wrap + 2;

                     if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {
                         n_adj = n & 2;
                     }

                     C[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap + 2][0];
                     C[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap + 2][1];

                     if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

                         C[0] = (1 + C[0] + (s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap + 2][0])) >> 1;
                         C[1] = (1 + C[1] + (s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap + 2][1])) >> 1;

                     }
                     if (s->mb_x == s->mb_width - 1) {
                         if (!v->is_intra[s->mb_x - s->mb_stride - 1]) {
                             c_valid = 1;

                             n_adj   = 3;
                             pos_c   = s->block_index[3] - 2 * wrap - 2;

                             if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {
                                 n_adj = n | 1;
                             }

                             C[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap - 2][0];
                             C[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap - 2][1];

                             if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {

                                 C[0] = (1 + C[0] + s->current_picture.motion_val[dir][s->block_index[1] - 2 * wrap - 2][0]) >> 1;
                                 C[1] = (1 + C[1] + s->current_picture.motion_val[dir][s->block_index[1] - 2 * wrap - 2][1]) >> 1;

                             }

                         } else
                             c_valid = 0;

                     }
                 }
             }
         }
     } else {

         pos_b   = s->block_index[1];

         b_valid = 1;

         B[0]    = s->current_picture.motion_val[dir][pos_b][0];
         B[1]    = s->current_picture.motion_val[dir][pos_b][1];

         pos_c   = s->block_index[0];

         c_valid = 1;

         C[0]    = s->current_picture.motion_val[dir][pos_c][0];
         C[1]    = s->current_picture.motion_val[dir][pos_c][1];

     }
 
     total_valid = a_valid + b_valid + c_valid;
     // check if predictor A is out of bounds

     if (!s->mb_x && !(n == 1 || n == 3)) {

         A[0] = A[1] = 0;
     }
     // check if predictor B is out of bounds
     if ((s->first_slice_line && v->blk_mv_type[xy]) || (s->first_slice_line && !(n & 2))) {
         B[0] = B[1] = C[0] = C[1] = 0;
     }
     if (!v->blk_mv_type[xy]) {

         if (s->mb_width == 1) {

             px = B[0];
             py = B[1];

         } else {

             if (total_valid >= 2) {
                 px = mid_pred(A[0], B[0], C[0]);
                 py = mid_pred(A[1], B[1], C[1]);
             } else if (total_valid) {

                 if      (a_valid) { px = A[0]; py = A[1]; }
                 else if (b_valid) { px = B[0]; py = B[1]; }

                 else              { px = C[0]; py = C[1]; }

             }

         }
     } else {
         if (a_valid)
             field_a = (A[1] & 4) ? 1 : 0;
         else
             field_a = 0;
         if (b_valid)
             field_b = (B[1] & 4) ? 1 : 0;
         else
             field_b = 0;
         if (c_valid)
             field_c = (C[1] & 4) ? 1 : 0;
         else
             field_c = 0;
 

         num_oppfield  = field_a + field_b + field_c;

         num_samefield = total_valid - num_oppfield;
         if (total_valid == 3) {
             if ((num_samefield == 3) || (num_oppfield == 3)) {
                 px = mid_pred(A[0], B[0], C[0]);
                 py = mid_pred(A[1], B[1], C[1]);
             } else if (num_samefield >= num_oppfield) {
                 /* take one MV from same field set depending on priority
                 the check for B may not be necessary */

                 px = !field_a ? A[0] : B[0];
                 py = !field_a ? A[1] : B[1];

             } else {

                 px =  field_a ? A[0] : B[0];
                 py =  field_a ? A[1] : B[1];

             }
         } else if (total_valid == 2) {
             if (num_samefield >= num_oppfield) {
                 if (!field_a && a_valid) {

                     px = A[0];
                     py = A[1];

                 } else if (!field_b && b_valid) {
                     px = B[0];
                     py = B[1];

                 } else /*if (c_valid)*/ {
                     av_assert1(c_valid);

                     px = C[0];
                     py = C[1];

                 } /*else px = py = 0;*/

             } else {
                 if (field_a && a_valid) {
                     px = A[0];
                     py = A[1];

                 } else /*if (field_b && b_valid)*/ {
                     av_assert1(field_b && b_valid);

                     px = B[0];
                     py = B[1];

                 } /*else if (c_valid) {

                     px = C[0];
                     py = C[1];

                 }*/

             }

         } else if (total_valid == 1) {
             px = (a_valid) ? A[0] : ((b_valid) ? B[0] : C[0]);
             py = (a_valid) ? A[1] : ((b_valid) ? B[1] : C[1]);

         }

     }

     /* store MV using signed modulus of MV range defined in 4.11 */

     s->mv[dir][n][0] = s->current_picture.motion_val[dir][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;
     s->mv[dir][n][1] = s->current_picture.motion_val[dir][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;

     if (mvn == 1) { /* duplicate motion data for 1-MV block */

         s->current_picture.motion_val[dir][xy +    1    ][0] = s->current_picture.motion_val[dir][xy][0];
         s->current_picture.motion_val[dir][xy +    1    ][1] = s->current_picture.motion_val[dir][xy][1];
         s->current_picture.motion_val[dir][xy + wrap    ][0] = s->current_picture.motion_val[dir][xy][0];
         s->current_picture.motion_val[dir][xy + wrap    ][1] = s->current_picture.motion_val[dir][xy][1];
         s->current_picture.motion_val[dir][xy + wrap + 1][0] = s->current_picture.motion_val[dir][xy][0];
         s->current_picture.motion_val[dir][xy + wrap + 1][1] = s->current_picture.motion_val[dir][xy][1];

     } else if (mvn == 2) { /* duplicate motion data for 2-Field MV block */

         s->current_picture.motion_val[dir][xy + 1][0] = s->current_picture.motion_val[dir][xy][0];
         s->current_picture.motion_val[dir][xy + 1][1] = s->current_picture.motion_val[dir][xy][1];
         s->mv[dir][n + 1][0] = s->mv[dir][n][0];
         s->mv[dir][n + 1][1] = s->mv[dir][n][1];

     }
 }
 
 /** Motion compensation for direct or interpolated blocks in B-frames
  */
 static void vc1_interp_mc(VC1Context *v)
 {
     MpegEncContext *s = &v->s;

     H264ChromaContext *h264chroma = &v->h264chroma;

     uint8_t *srcY, *srcU, *srcV;
     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

     int off, off_uv;
     int v_edge_pos = s->v_edge_pos >> v->field_mode;

     int use_ic = v->next_use_ic;

     if (!v->field_mode && !v->s.next_picture.f.data[0])
         return;

     mx   = s->mv[1][0][0];
     my   = s->mv[1][0][1];

     uvmx = (mx + ((mx & 3) == 3)) >> 1;
     uvmy = (my + ((my & 3) == 3)) >> 1;

     if (v->field_mode) {

         if (v->cur_field_type != v->ref_field_type[1]) {

             my   = my   - 2 + 4 * v->cur_field_type;

             uvmy = uvmy - 2 + 4 * v->cur_field_type;

         }

     }

     if (v->fastuvmc) {
         uvmx = uvmx + ((uvmx < 0) ? -(uvmx & 1) : (uvmx & 1));
         uvmy = uvmy + ((uvmy < 0) ? -(uvmy & 1) : (uvmy & 1));

     }

     srcY = s->next_picture.f.data[0];
     srcU = s->next_picture.f.data[1];
     srcV = s->next_picture.f.data[2];

     src_x   = s->mb_x * 16 + (mx   >> 2);
     src_y   = s->mb_y * 16 + (my   >> 2);
     uvsrc_x = s->mb_x *  8 + (uvmx >> 2);
     uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

     if (v->profile != PROFILE_ADVANCED) {

         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);
         src_y   = av_clip(  src_y, -16, s->mb_height * 16);
         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);
         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

     } else {

         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);
         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);
         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);
         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);
     }
 

     srcY += src_y   * s->linesize   + src_x;

     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;
 

     if (v->field_mode && v->ref_field_type[1]) {
         srcY += s->current_picture_ptr->f.linesize[0];
         srcU += s->current_picture_ptr->f.linesize[1];
         srcV += s->current_picture_ptr->f.linesize[2];
     }
 

     /* for grayscale we should not try to read from unknown area */

     if (s->flags & CODEC_FLAG_GRAY) {

         srcU = s->edge_emu_buffer + 18 * s->linesize;
         srcV = s->edge_emu_buffer + 18 * s->linesize;
     }
 

     if (v->rangeredfrm || s->h_edge_pos < 22 || v_edge_pos < 22 || use_ic

         || (unsigned)(src_x - 1) > s->h_edge_pos - (mx & 3) - 16 - 3
         || (unsigned)(src_y - 1) > v_edge_pos    - (my & 3) - 16 - 3) {

         uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;

 
         srcY -= s->mspel * (1 + s->linesize);

         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,
                                  s->linesize, s->linesize,

                                  17 + s->mspel * 2, 17 + s->mspel * 2,
                                  src_x - s->mspel, src_y - s->mspel,
                                  s->h_edge_pos, v_edge_pos);

         srcY = s->edge_emu_buffer;

         s->vdsp.emulated_edge_mc(uvbuf, srcU,
                                  s->uvlinesize, s->uvlinesize,
                                  8 + 1, 8 + 1,

                                  uvsrc_x, uvsrc_y,

                                  s->h_edge_pos >> 1, v_edge_pos >> 1);

         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,
                                  s->uvlinesize, s->uvlinesize,
                                  8 + 1, 8 + 1,

                                  uvsrc_x, uvsrc_y,

                                  s->h_edge_pos >> 1, v_edge_pos >> 1);

         srcU = uvbuf;
         srcV = uvbuf + 16;
         /* if we deal with range reduction we need to scale source blocks */

         if (v->rangeredfrm) {

             int i, j;
             uint8_t *src, *src2;
 
             src = srcY;

             for (j = 0; j < 17 + s->mspel * 2; j++) {
                 for (i = 0; i < 17 + s->mspel * 2; i++)
                     src[i] = ((src[i] - 128) >> 1) + 128;

                 src += s->linesize;
             }

             src = srcU;
             src2 = srcV;
             for (j = 0; j < 9; j++) {
                 for (i = 0; i < 9; i++) {
                     src[i]  = ((src[i]  - 128) >> 1) + 128;

                     src2[i] = ((src2[i] - 128) >> 1) + 128;
                 }

                 src  += s->uvlinesize;

                 src2 += s->uvlinesize;
             }
         }

         if (use_ic) {

             uint8_t (*luty )[256] = v->next_luty;
             uint8_t (*lutuv)[256] = v->next_lutuv;

             int i, j;
             uint8_t *src, *src2;
 
             src = srcY;
             for (j = 0; j < 17 + s->mspel * 2; j++) {

                 int f = v->field_mode ? v->ref_field_type[1] : ((j+src_y - s->mspel) & 1);

                 for (i = 0; i < 17 + s->mspel * 2; i++)

                     src[i] = luty[f][src[i]];

                 src += s->linesize;
             }
             src  = srcU;
             src2 = srcV;
             for (j = 0; j < 9; j++) {

                 int f = v->field_mode ? v->ref_field_type[1] : ((j+uvsrc_y) & 1);

                 for (i = 0; i < 9; i++) {

                     src[i]  = lutuv[f][src[i]];
                     src2[i] = lutuv[f][src2[i]];

                 }
                 src  += s->uvlinesize;
                 src2 += s->uvlinesize;
             }
         }

         srcY += s->mspel * (1 + s->linesize);
     }
 

     off    = 0;
     off_uv = 0;

     if (s->mspel) {

         dxy = ((my & 3) << 2) | (mx & 3);

         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);
         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);

         srcY += s->linesize * 8;

         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);
         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

     } else { // hpel mc
         dxy = (my & 2) | ((mx & 2) >> 1);
 

         if (!v->rnd)

             s->hdsp.avg_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);

         else

             s->hdsp.avg_no_rnd_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize, 16);

     }
 

     if (s->flags & CODEC_FLAG_GRAY) return;

     /* Chroma MC always uses qpel blilinear */

     uvmx = (uvmx & 3) << 1;
     uvmy = (uvmy & 3) << 1;
     if (!v->rnd) {

         h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);
         h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

     } else {

         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);
         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

     }
 }
 
 static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)
 {
     int n = bfrac;
 
 #if B_FRACTION_DEN==256

     if (inv)

         n -= 256;

     if (!qs)

         return 2 * ((value * n + 255) >> 9);
     return (value * n + 128) >> 8;
 #else

     if (inv)

         n -= B_FRACTION_DEN;

     if (!qs)

         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));
     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;
 #endif
 }
 
 /** 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) {

         vc1_mc_1mv(v, 0);
         vc1_interp_mc(v);
         return;
     }

     if (mode == BMV_TYPE_INTERPOLATED) {

         vc1_mc_1mv(v, 0);
         vc1_interp_mc(v);
         return;
     }
 
     vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));
 }
 

 static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],
                                  int direct, int mvtype)

 {
     MpegEncContext *s = &v->s;
     int xy, wrap, off = 0;
     int16_t *A, *B, *C;
     int px, py;
     int sum;
     int r_x, r_y;
     const uint8_t *is_intra = v->mb_type[0];
 

     av_assert0(!v->field_mode);
 

     r_x = v->range_x;
     r_y = v->range_y;
     /* scale MV difference to be quad-pel */
     dmv_x[0] <<= 1 - s->quarter_sample;
     dmv_y[0] <<= 1 - s->quarter_sample;
     dmv_x[1] <<= 1 - s->quarter_sample;
     dmv_y[1] <<= 1 - s->quarter_sample;
 
     wrap = s->b8_stride;
     xy = s->block_index[0];
 

     if (s->mb_intra) {

         s->current_picture.motion_val[0][xy][0] =
         s->current_picture.motion_val[0][xy][1] =
         s->current_picture.motion_val[1][xy][0] =
         s->current_picture.motion_val[1][xy][1] = 0;

         return;
     }

         if (direct && s->next_picture_ptr->field_picture)
             av_log(s->avctx, AV_LOG_WARNING, "Mixed frame/field direct mode not supported\n");
 

         s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);
         s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);
         s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);
         s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);

         /* Pullback predicted motion vectors as specified in 8.4.5.4 */
         s->mv[0][0][0] = av_clip(s->mv[0][0][0], -60 - (s->mb_x << 6), (s->mb_width  << 6) - 4 - (s->mb_x << 6));
         s->mv[0][0][1] = av_clip(s->mv[0][0][1], -60 - (s->mb_y << 6), (s->mb_height << 6) - 4 - (s->mb_y << 6));
         s->mv[1][0][0] = av_clip(s->mv[1][0][0], -60 - (s->mb_x << 6), (s->mb_width  << 6) - 4 - (s->mb_x << 6));
         s->mv[1][0][1] = av_clip(s->mv[1][0][1], -60 - (s->mb_y << 6), (s->mb_height << 6) - 4 - (s->mb_y << 6));

     if (direct) {

         s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];
         s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];
         s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];
         s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

         return;
     }
 

     if ((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

         C   = s->current_picture.motion_val[0][xy - 2];
         A   = s->current_picture.motion_val[0][xy - wrap * 2];

         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

         B   = s->current_picture.motion_val[0][xy - wrap * 2 + off];

         if (!s->mb_x) C[0] = C[1] = 0;
         if (!s->first_slice_line) { // predictor A is not out of bounds
             if (s->mb_width == 1) {

                 px = A[0];
                 py = A[1];
             } else {
                 px = mid_pred(A[0], B[0], C[0]);
                 py = mid_pred(A[1], B[1], C[1]);
             }

         } else if (s->mb_x) { // predictor C is not out of bounds

             px = C[0];
             py = C[1];
         } else {
             px = py = 0;
         }
         /* Pullback MV as specified in 8.3.5.3.4 */
         {
             int qx, qy, X, Y;

             if (v->profile < PROFILE_ADVANCED) {

                 qx = (s->mb_x << 5);
                 qy = (s->mb_y << 5);

                 X  = (s->mb_width  << 5) - 4;
                 Y  = (s->mb_height << 5) - 4;
                 if (qx + px < -28) px = -28 - qx;
                 if (qy + py < -28) py = -28 - qy;
                 if (qx + px > X) px = X - qx;
                 if (qy + py > Y) py = Y - qy;

             } else {
                 qx = (s->mb_x << 6);
                 qy = (s->mb_y << 6);

                 X  = (s->mb_width  << 6) - 4;
                 Y  = (s->mb_height << 6) - 4;
                 if (qx + px < -60) px = -60 - qx;
                 if (qy + py < -60) py = -60 - qy;
                 if (qx + px > X) px = X - qx;
                 if (qy + py > Y) py = Y - qy;

             }
         }
         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

         if (0 && !s->first_slice_line && s->mb_x) {
             if (is_intra[xy - wrap])

                 sum = FFABS(px) + FFABS(py);
             else
                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

             if (sum > 32) {
                 if (get_bits1(&s->gb)) {

                     px = A[0];
                     py = A[1];
                 } else {
                     px = C[0];
                     py = C[1];
                 }
             } else {

                 if (is_intra[xy - 2])

                     sum = FFABS(px) + FFABS(py);
                 else
                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

                 if (sum > 32) {
                     if (get_bits1(&s->gb)) {

                         px = A[0];
                         py = A[1];
                     } else {
                         px = C[0];
                         py = C[1];
                     }
                 }
             }
         }
         /* store MV using signed modulus of MV range defined in 4.11 */
         s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;
         s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;
     }

     if ((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {

         C   = s->current_picture.motion_val[1][xy - 2];
         A   = s->current_picture.motion_val[1][xy - wrap * 2];

         off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;

         B   = s->current_picture.motion_val[1][xy - wrap * 2 + off];

         if (!s->mb_x)
             C[0] = C[1] = 0;
         if (!s->first_slice_line) { // predictor A is not out of bounds
             if (s->mb_width == 1) {

                 px = A[0];
                 py = A[1];
             } else {
                 px = mid_pred(A[0], B[0], C[0]);
                 py = mid_pred(A[1], B[1], C[1]);
             }

         } else if (s->mb_x) { // predictor C is not out of bounds

             px = C[0];
             py = C[1];
         } else {
             px = py = 0;
         }
         /* Pullback MV as specified in 8.3.5.3.4 */
         {
             int qx, qy, X, Y;

             if (v->profile < PROFILE_ADVANCED) {

                 qx = (s->mb_x << 5);
                 qy = (s->mb_y << 5);

                 X  = (s->mb_width  << 5) - 4;
                 Y  = (s->mb_height << 5) - 4;
                 if (qx + px < -28) px = -28 - qx;
                 if (qy + py < -28) py = -28 - qy;
                 if (qx + px > X) px = X - qx;
                 if (qy + py > Y) py = Y - qy;

             } else {
                 qx = (s->mb_x << 6);
                 qy = (s->mb_y << 6);

                 X  = (s->mb_width  << 6) - 4;
                 Y  = (s->mb_height << 6) - 4;
                 if (qx + px < -60) px = -60 - qx;
                 if (qy + py < -60) py = -60 - qy;
                 if (qx + px > X) px = X - qx;
                 if (qy + py > Y) py = Y - qy;

             }
         }
         /* Calculate hybrid prediction as specified in 8.3.5.3.5 */

         if (0 && !s->first_slice_line && s->mb_x) {
             if (is_intra[xy - wrap])

                 sum = FFABS(px) + FFABS(py);
             else
                 sum = FFABS(px - A[0]) + FFABS(py - A[1]);

             if (sum > 32) {
                 if (get_bits1(&s->gb)) {

                     px = A[0];
                     py = A[1];
                 } else {
                     px = C[0];
                     py = C[1];
                 }
             } else {

                 if (is_intra[xy - 2])

                     sum = FFABS(px) + FFABS(py);
                 else
                     sum = FFABS(px - C[0]) + FFABS(py - C[1]);

                 if (sum > 32) {
                     if (get_bits1(&s->gb)) {

                         px = A[0];
                         py = A[1];
                     } else {
                         px = C[0];
                         py = C[1];
                     }
                 }
             }
         }
         /* store MV using signed modulus of MV range defined in 4.11 */
 
         s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;
         s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;
     }

     s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];
     s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];
     s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];
     s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];

 }
 

 static inline void vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y, int mv1, int *pred_flag)
 {
     int dir = (v->bmvtype == BMV_TYPE_BACKWARD) ? 1 : 0;
     MpegEncContext *s = &v->s;
     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
 
     if (v->bmvtype == BMV_TYPE_DIRECT) {
         int total_opp, k, f;

         if (s->next_picture.mb_type[mb_pos + v->mb_off] != MB_TYPE_INTRA) {
             s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],

                                       v->bfraction, 0, s->quarter_sample);

             s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][1],

                                       v->bfraction, 0, s->quarter_sample);

             s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],

                                       v->bfraction, 1, s->quarter_sample);

             s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][1],

                                       v->bfraction, 1, s->quarter_sample);

 
             total_opp = v->mv_f_next[0][s->block_index[0] + v->blocks_off]
                       + v->mv_f_next[0][s->block_index[1] + v->blocks_off]
                       + v->mv_f_next[0][s->block_index[2] + v->blocks_off]
                       + v->mv_f_next[0][s->block_index[3] + v->blocks_off];
             f = (total_opp > 2) ? 1 : 0;
         } else {
             s->mv[0][0][0] = s->mv[0][0][1] = 0;
             s->mv[1][0][0] = s->mv[1][0][1] = 0;
             f = 0;
         }
         v->ref_field_type[0] = v->ref_field_type[1] = v->cur_field_type ^ f;
         for (k = 0; k < 4; k++) {

             s->current_picture.motion_val[0][s->block_index[k] + v->blocks_off][0] = s->mv[0][0][0];
             s->current_picture.motion_val[0][s->block_index[k] + v->blocks_off][1] = s->mv[0][0][1];
             s->current_picture.motion_val[1][s->block_index[k] + v->blocks_off][0] = s->mv[1][0][0];
             s->current_picture.motion_val[1][s->block_index[k] + v->blocks_off][1] = s->mv[1][0][1];

             v->mv_f[0][s->block_index[k] + v->blocks_off] = f;
             v->mv_f[1][s->block_index[k] + v->blocks_off] = f;
         }
         return;
     }
     if (v->bmvtype == BMV_TYPE_INTERPOLATED) {
         vc1_pred_mv(v, 0, dmv_x[0], dmv_y[0],   1, v->range_x, v->range_y, v->mb_type[0], pred_flag[0], 0);
         vc1_pred_mv(v, 0, dmv_x[1], dmv_y[1],   1, v->range_x, v->range_y, v->mb_type[0], pred_flag[1], 1);
         return;
     }
     if (dir) { // backward
         vc1_pred_mv(v, n, dmv_x[1], dmv_y[1], mv1, v->range_x, v->range_y, v->mb_type[0], pred_flag[1], 1);
         if (n == 3 || mv1) {

             vc1_pred_mv(v, 0, dmv_x[0], dmv_y[0],   1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

         }
     } else { // forward
         vc1_pred_mv(v, n, dmv_x[0], dmv_y[0], mv1, v->range_x, v->range_y, v->mb_type[0], pred_flag[0], 0);
         if (n == 3 || mv1) {

             vc1_pred_mv(v, 0, dmv_x[1], dmv_y[1],   1, v->range_x, v->range_y, v->mb_type[0], 0, 1);

         }
     }
 }
 

 /** 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 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 = NULL;

     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 += 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 = NULL;

     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->dsp.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 += 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->dsp.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->dsp.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 };
 

 static av_always_inline void vc1_apply_p_v_loop_filter(VC1Context *v, int block_num)
 {

     MpegEncContext *s  = &v->s;

     int mb_cbp         = v->cbp[s->mb_x - s->mb_stride],
         block_cbp      = mb_cbp      >> (block_num * 4), bottom_cbp,
         mb_is_intra    = v->is_intra[s->mb_x - s->mb_stride],
         block_is_intra = mb_is_intra >> (block_num * 4), bottom_is_intra;

     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

     uint8_t *dst;
 

     if (block_num > 3) {

         dst      = s->dest[block_num - 3];
     } else {
         dst      = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 8) * linesize;
     }

     if (s->mb_y != s->end_mb_y || block_num < 2) {

         int16_t (*mv)[2];
         int mv_stride;
 

         if (block_num > 3) {

             bottom_cbp      = v->cbp[s->mb_x]      >> (block_num * 4);
             bottom_is_intra = v->is_intra[s->mb_x] >> (block_num * 4);
             mv              = &v->luma_mv[s->mb_x - s->mb_stride];
             mv_stride       = s->mb_stride;
         } else {

             bottom_cbp      = (block_num < 2) ? (mb_cbp               >> ((block_num + 2) * 4))
                                               : (v->cbp[s->mb_x]      >> ((block_num - 2) * 4));
             bottom_is_intra = (block_num < 2) ? (mb_is_intra          >> ((block_num + 2) * 4))
                                               : (v->is_intra[s->mb_x] >> ((block_num - 2) * 4));

             mv_stride       = s->b8_stride;

             mv              = &s->current_picture.motion_val[0][s->block_index[block_num] - 2 * mv_stride];

         }
 
         if (bottom_is_intra & 1 || block_is_intra & 1 ||
             mv[0][0] != mv[mv_stride][0] || mv[0][1] != mv[mv_stride][1]) {
             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);
         } else {
             idx = ((bottom_cbp >> 2) | block_cbp) & 3;

             if (idx == 3) {

                 v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);
             } else if (idx) {
                 if (idx == 1)
                     v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);
                 else
                     v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);
             }
         }
     }
 
     dst -= 4 * linesize;

     ttblk = (v->ttblk[s->mb_x - s->mb_stride] >> (block_num * 4)) & 0xF;

     if (ttblk == TT_4X4 || ttblk == TT_8X4) {
         idx = (block_cbp | (block_cbp >> 2)) & 3;
         if (idx == 3) {
             v->vc1dsp.vc1_v_loop_filter8(dst, linesize, v->pq);
         } else if (idx) {
             if (idx == 1)
                 v->vc1dsp.vc1_v_loop_filter4(dst + 4, linesize, v->pq);
             else
                 v->vc1dsp.vc1_v_loop_filter4(dst,     linesize, v->pq);
         }
     }
 }
 
 static av_always_inline void vc1_apply_p_h_loop_filter(VC1Context *v, int block_num)
 {

     MpegEncContext *s  = &v->s;

     int mb_cbp         = v->cbp[s->mb_x - 1 - s->mb_stride],
         block_cbp      = mb_cbp      >> (block_num * 4), right_cbp,
         mb_is_intra    = v->is_intra[s->mb_x - 1 - s->mb_stride],
         block_is_intra = mb_is_intra >> (block_num * 4), right_is_intra;

     int idx, linesize  = block_num > 3 ? s->uvlinesize : s->linesize, ttblk;

     uint8_t *dst;
 
     if (block_num > 3) {
         dst = s->dest[block_num - 3] - 8 * linesize;
     } else {
         dst = s->dest[0] + (block_num & 1) * 8 + ((block_num & 2) * 4 - 16) * linesize - 8;
     }
 
     if (s->mb_x != s->mb_width || !(block_num & 5)) {
         int16_t (*mv)[2];
 

         if (block_num > 3) {

             right_cbp      = v->cbp[s->mb_x - s->mb_stride] >> (block_num * 4);
             right_is_intra = v->is_intra[s->mb_x - s->mb_stride] >> (block_num * 4);
             mv             = &v->luma_mv[s->mb_x - s->mb_stride - 1];

         } else {
             right_cbp      = (block_num & 1) ? (v->cbp[s->mb_x - s->mb_stride]      >> ((block_num - 1) * 4))
                                              : (mb_cbp                              >> ((block_num + 1) * 4));
             right_is_intra = (block_num & 1) ? (v->is_intra[s->mb_x - s->mb_stride] >> ((block_num - 1) * 4))
                                              : (mb_is_intra                         >> ((block_num + 1) * 4));

             mv             = &s->current_picture.motion_val[0][s->block_index[block_num] - s->b8_stride * 2 - 2];

         }
         if (block_is_intra & 1 || right_is_intra & 1 || mv[0][0] != mv[1][0] || mv[0][1] != mv[1][1]) {
             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);
         } else {
             idx = ((right_cbp >> 1) | block_cbp) & 5; // FIXME check
             if (idx == 5) {
                 v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);
             } else if (idx) {
                 if (idx == 1)

                     v->vc1dsp.vc1_h_loop_filter4(dst + 4 * linesize, linesize, v->pq);

                 else

                     v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

             }
         }
     }
 
     dst -= 4;
     ttblk = (v->ttblk[s->mb_x - s->mb_stride - 1] >> (block_num * 4)) & 0xf;
     if (ttblk == TT_4X4 || ttblk == TT_4X8) {
         idx = (block_cbp | (block_cbp >> 1)) & 5;
         if (idx == 5) {
             v->vc1dsp.vc1_h_loop_filter8(dst, linesize, v->pq);
         } else if (idx) {
             if (idx == 1)

                 v->vc1dsp.vc1_h_loop_filter4(dst + linesize * 4, linesize, v->pq);

             else

                 v->vc1dsp.vc1_h_loop_filter4(dst,                linesize, v->pq);

         }
     }
 }
 
 static void vc1_apply_p_loop_filter(VC1Context *v)
 {
     MpegEncContext *s = &v->s;
     int i;
 
     for (i = 0; i < 6; i++) {
         vc1_apply_p_v_loop_filter(v, i);
     }
 

     /* V always precedes H, therefore we run H one MB before V;

      * at the end of a row, we catch up to complete the row */
     if (s->mb_x) {
         for (i = 0; i < 6; i++) {
             vc1_apply_p_h_loop_filter(v, i);
         }
         if (s->mb_x == s->mb_width - 1) {
             s->mb_x++;
             ff_update_block_index(s);
             for (i = 0; i < 6; i++) {
                 vc1_apply_p_h_loop_filter(v, i);
             }
         }
     }
 }
 

 /** 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;

             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) 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->dsp.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;

             vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

             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);
                     }

                     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)

                         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)
                     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->dsp.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++) {

                 vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

                 vc1_mc_4mv_luma(v, i, 0, 0);

             }

             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;