vc1: prettyprint some tables

[libav.git] / libavcodec / vc1dec.c

/*
 * VC-1 and WMV3 decoder
 * Copyright (c) 2011 Mashiat Sarker Shakkhar
 * Copyright (c) 2006-2007 Konstantin Shishkov
 * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * VC-1 and WMV3 decoder
 *
 */
#include "internal.h"
#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h263.h"
#include "vc1.h"
#include "vc1data.h"
#include "vc1acdata.h"
#include "msmpeg4data.h"
#include "unary.h"
#include "simple_idct.h"
#include "mathops.h"
#include "vdpau_internal.h"

#undef NDEBUG
#include <assert.h>

#define MB_INTRA_VLC_BITS 9
#define DC_VLC_BITS 9
#define AC_VLC_BITS 9


static const uint16_t vlc_offs[] = {
        0,   520,   552,   616,  1128,  1160,  1224,  1740,  1772,  1836,  1900,  2436,
     2986,  3050,  3610,  4154,  4218,  4746,  5326,  5390,  5902,  6554,  7658,  8342,
     9304,  9988, 10630, 11234, 12174, 13006, 13560, 14232, 14786, 15432, 16350, 17522,
    20372, 21818, 22330, 22394, 23166, 23678, 23742, 24820, 25332, 25396, 26460, 26980,
    27048, 27592, 27600, 27608, 27616, 27624, 28224, 28258, 28290, 28802, 28834, 28866,
    29378, 29412, 29444, 29960, 29994, 30026, 30538, 30572, 30604, 31120, 31154, 31186,
    31714, 31746, 31778, 32306, 32340, 32372
};

// 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};

/**
 * Init VC-1 specific tables and VC1Context members
 * @param v The VC1Context to initialize
 * @return Status
 */
static int vc1_init_common(VC1Context *v)
{
    static int done = 0;
    int i = 0;
    static VLC_TYPE vlc_table[32372][2];

    v->hrd_rate = v->hrd_buffer = NULL;

    /* VLC tables */
    if(!done)
    {
        INIT_VLC_STATIC(&ff_vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,
                 ff_vc1_bfraction_bits, 1, 1,
                 ff_vc1_bfraction_codes, 1, 1, 1 << VC1_BFRACTION_VLC_BITS);
        INIT_VLC_STATIC(&ff_vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 4,
                 ff_vc1_norm2_bits, 1, 1,
                 ff_vc1_norm2_codes, 1, 1, 1 << VC1_NORM2_VLC_BITS);
        INIT_VLC_STATIC(&ff_vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 64,
                 ff_vc1_norm6_bits, 1, 1,
                 ff_vc1_norm6_codes, 2, 2, 556);
        INIT_VLC_STATIC(&ff_vc1_imode_vlc, VC1_IMODE_VLC_BITS, 7,
                 ff_vc1_imode_bits, 1, 1,
                 ff_vc1_imode_codes, 1, 1, 1 << VC1_IMODE_VLC_BITS);
        for (i=0; i<3; i++)
        {
            ff_vc1_ttmb_vlc[i].table = &vlc_table[vlc_offs[i*3+0]];
            ff_vc1_ttmb_vlc[i].table_allocated = vlc_offs[i*3+1] - vlc_offs[i*3+0];
            init_vlc(&ff_vc1_ttmb_vlc[i], VC1_TTMB_VLC_BITS, 16,
                     ff_vc1_ttmb_bits[i], 1, 1,
                     ff_vc1_ttmb_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
            ff_vc1_ttblk_vlc[i].table = &vlc_table[vlc_offs[i*3+1]];
            ff_vc1_ttblk_vlc[i].table_allocated = vlc_offs[i*3+2] - vlc_offs[i*3+1];
            init_vlc(&ff_vc1_ttblk_vlc[i], VC1_TTBLK_VLC_BITS, 8,
                     ff_vc1_ttblk_bits[i], 1, 1,
                     ff_vc1_ttblk_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
            ff_vc1_subblkpat_vlc[i].table = &vlc_table[vlc_offs[i*3+2]];
            ff_vc1_subblkpat_vlc[i].table_allocated = vlc_offs[i*3+3] - vlc_offs[i*3+2];
            init_vlc(&ff_vc1_subblkpat_vlc[i], VC1_SUBBLKPAT_VLC_BITS, 15,
                     ff_vc1_subblkpat_bits[i], 1, 1,
                     ff_vc1_subblkpat_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
        }
        for(i=0; i<4; i++)
        {
            ff_vc1_4mv_block_pattern_vlc[i].table = &vlc_table[vlc_offs[i*3+9]];
            ff_vc1_4mv_block_pattern_vlc[i].table_allocated = vlc_offs[i*3+10] - vlc_offs[i*3+9];
            init_vlc(&ff_vc1_4mv_block_pattern_vlc[i], VC1_4MV_BLOCK_PATTERN_VLC_BITS, 16,
                     ff_vc1_4mv_block_pattern_bits[i], 1, 1,
                     ff_vc1_4mv_block_pattern_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
            ff_vc1_cbpcy_p_vlc[i].table = &vlc_table[vlc_offs[i*3+10]];
            ff_vc1_cbpcy_p_vlc[i].table_allocated = vlc_offs[i*3+11] - vlc_offs[i*3+10];
            init_vlc(&ff_vc1_cbpcy_p_vlc[i], VC1_CBPCY_P_VLC_BITS, 64,
                     ff_vc1_cbpcy_p_bits[i], 1, 1,
                     ff_vc1_cbpcy_p_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
            ff_vc1_mv_diff_vlc[i].table = &vlc_table[vlc_offs[i*3+11]];
            ff_vc1_mv_diff_vlc[i].table_allocated = vlc_offs[i*3+12] - vlc_offs[i*3+11];
            init_vlc(&ff_vc1_mv_diff_vlc[i], VC1_MV_DIFF_VLC_BITS, 73,
                     ff_vc1_mv_diff_bits[i], 1, 1,
                     ff_vc1_mv_diff_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
        }
        for(i=0; i<8; i++){
            ff_vc1_ac_coeff_table[i].table = &vlc_table[vlc_offs[i*2+21]];
            ff_vc1_ac_coeff_table[i].table_allocated = vlc_offs[i*2+22] - vlc_offs[i*2+21];
            init_vlc(&ff_vc1_ac_coeff_table[i], AC_VLC_BITS, vc1_ac_sizes[i],
                     &vc1_ac_tables[i][0][1], 8, 4,
                     &vc1_ac_tables[i][0][0], 8, 4, INIT_VLC_USE_NEW_STATIC);
            /* initialize interlaced MVDATA tables (2-Ref) */
            ff_vc1_2ref_mvdata_vlc[i].table = &vlc_table[vlc_offs[i*2+22]];
            ff_vc1_2ref_mvdata_vlc[i].table_allocated = vlc_offs[i*2+23] - vlc_offs[i*2+22];
            init_vlc(&ff_vc1_2ref_mvdata_vlc[i], VC1_2REF_MVDATA_VLC_BITS, 126,
                     ff_vc1_2ref_mvdata_bits[i], 1, 1,
                     ff_vc1_2ref_mvdata_codes[i], 4, 4, INIT_VLC_USE_NEW_STATIC);
        }
        for (i=0; i<4; i++) {
            /* initialize 4MV MBMODE VLC tables for interlaced frame P picture */
            ff_vc1_intfr_4mv_mbmode_vlc[i].table = &vlc_table[vlc_offs[i*3+37]];
            ff_vc1_intfr_4mv_mbmode_vlc[i].table_allocated = vlc_offs[i*3+38] - vlc_offs[i*3+37];
            init_vlc(&ff_vc1_intfr_4mv_mbmode_vlc[i], VC1_INTFR_4MV_MBMODE_VLC_BITS, 15,
                     ff_vc1_intfr_4mv_mbmode_bits[i], 1, 1,
                     ff_vc1_intfr_4mv_mbmode_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
            /* initialize NON-4MV MBMODE VLC tables for the same */
            ff_vc1_intfr_non4mv_mbmode_vlc[i].table = &vlc_table[vlc_offs[i*3+38]];
            ff_vc1_intfr_non4mv_mbmode_vlc[i].table_allocated = vlc_offs[i*3+39] - vlc_offs[i*3+38];
            init_vlc(&ff_vc1_intfr_non4mv_mbmode_vlc[i], VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 9,
                     ff_vc1_intfr_non4mv_mbmode_bits[i], 1, 1,
                     ff_vc1_intfr_non4mv_mbmode_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
            /* initialize interlaced MVDATA tables (1-Ref) */
            ff_vc1_1ref_mvdata_vlc[i].table = &vlc_table[vlc_offs[i*3+39]];
            ff_vc1_1ref_mvdata_vlc[i].table_allocated = vlc_offs[i*3+40] - vlc_offs[i*3+39];
            init_vlc(&ff_vc1_1ref_mvdata_vlc[i], VC1_1REF_MVDATA_VLC_BITS, 72,
                     ff_vc1_1ref_mvdata_bits[i], 1, 1,
                     ff_vc1_1ref_mvdata_codes[i], 4, 4, INIT_VLC_USE_NEW_STATIC);
        }
        for (i=0; i<4; i++) {
            /* Initialize 2MV Block pattern VLC tables */
            ff_vc1_2mv_block_pattern_vlc[i].table = &vlc_table[vlc_offs[i+49]];
            ff_vc1_2mv_block_pattern_vlc[i].table_allocated = vlc_offs[i+50] - vlc_offs[i+49];
            init_vlc(&ff_vc1_2mv_block_pattern_vlc[i], VC1_2MV_BLOCK_PATTERN_VLC_BITS, 4,
                    ff_vc1_2mv_block_pattern_bits[i], 1, 1,
                    ff_vc1_2mv_block_pattern_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
        }
        for (i=0; i<8; i++) {
            /* Initialize interlaced CBPCY VLC tables (Table 124 - Table 131) */
            ff_vc1_icbpcy_vlc[i].table = &vlc_table[vlc_offs[i*3+53]];
            ff_vc1_icbpcy_vlc[i].table_allocated = vlc_offs[i*3+54] - vlc_offs[i*3+53];
            init_vlc(&ff_vc1_icbpcy_vlc[i], VC1_ICBPCY_VLC_BITS, 63,
                    ff_vc1_icbpcy_p_bits[i], 1, 1,
                    ff_vc1_icbpcy_p_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
            /* Initialize interlaced field picture MBMODE VLC tables */
            ff_vc1_if_mmv_mbmode_vlc[i].table = &vlc_table[vlc_offs[i*3+54]];
            ff_vc1_if_mmv_mbmode_vlc[i].table_allocated = vlc_offs[i*3+55] - vlc_offs[i*3+54];
            init_vlc(&ff_vc1_if_mmv_mbmode_vlc[i], VC1_IF_MMV_MBMODE_VLC_BITS, 8,
                    ff_vc1_if_mmv_mbmode_bits[i], 1, 1,
                    ff_vc1_if_mmv_mbmode_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
            ff_vc1_if_1mv_mbmode_vlc[i].table = &vlc_table[vlc_offs[i*3+55]];
            ff_vc1_if_1mv_mbmode_vlc[i].table_allocated = vlc_offs[i*3+56] - vlc_offs[i*3+55];
            init_vlc(&ff_vc1_if_1mv_mbmode_vlc[i], VC1_IF_1MV_MBMODE_VLC_BITS, 6,
                    ff_vc1_if_1mv_mbmode_bits[i], 1, 1,
                    ff_vc1_if_1mv_mbmode_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
        }
        done = 1;
    }

    /* Other defaults */
    v->pq = -1;
    v->mvrange = 0; /* 7.1.1.18, p80 */

    return 0;
}

/***********************************************************************/
/**
 * @name VC-1 Bitplane decoding
 * @see 8.7, p56
 * @{
 */

/**
 * Imode types
 * @{
 */
enum Imode {
    IMODE_RAW,
    IMODE_NORM2,
    IMODE_DIFF2,
    IMODE_NORM6,
    IMODE_DIFF6,
    IMODE_ROWSKIP,
    IMODE_COLSKIP
};
/** @} */ //imode defines


/** @} */ //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;
    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;
            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;
            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;
    DSPContext *dsp = &v->s.dsp;
    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;
    if (!v->field_mode && !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) {
        s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0] = mx;
        s->current_picture.f.motion_val[1][s->block_index[0] + 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;
    }

    if(v->fastuvmc && (v->fcm != 1)) { // fastuvmc shall be ignored for interlaced frame picture
        uvmx = uvmx + ((uvmx<0)?(uvmx&1):-(uvmx&1));
        uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));
    }
    if (v->field_mode) { // interlaced field picture
        if (!dir) {
            if ((v->cur_field_type != v->ref_field_type[dir]) && v->cur_field_type) {
                srcY = s->current_picture.f.data[0];
                srcU = s->current_picture.f.data[1];
                srcV = s->current_picture.f.data[2];
            } else {
                srcY = s->last_picture.f.data[0];
                srcU = s->last_picture.f.data[1];
                srcV = s->last_picture.f.data[2];
            }
        } else {
            srcY = s->next_picture.f.data[0];
            srcU = s->next_picture.f.data[1];
            srcV = s->next_picture.f.data[2];
        }
    } else {
        if(!dir) {
            srcY = s->last_picture.f.data[0];
            srcU = s->last_picture.f.data[1];
            srcV = s->last_picture.f.data[2];
        } else {
            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[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 || (v->mv_mode == MV_PMODE_INTENSITY_COMP)
       || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 16 - s->mspel*3
       || (unsigned)(src_y - s->mspel) > v_edge_pos - (my&3) - 16 - s->mspel*3){
        uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

        srcY -= s->mspel * (1 + s->linesize);
        s->dsp.emulated_edge_mc(s->edge_emu_buffer, srcY, 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->dsp.emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,
                            uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);
        s->dsp.emulated_edge_mc(uvbuf + 16, srcV, 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(v->mv_mode == MV_PMODE_INTENSITY_COMP) {
            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] = v->luty[src[i]];
                src += s->linesize;
            }
            src = srcU; src2 = srcV;
            for(j = 0; j < 9; j++) {
                for(i = 0; i < 9; i++) {
                    src[i] = v->lutuv[src[i]];
                    src2[i] = v->lutuv[src2[i]];
                }
                src += s->uvlinesize;
                src2 += s->uvlinesize;
            }
        }
        srcY += s->mspel * (1 + s->linesize);
    }

    if (v->field_mode && v->cur_field_type) {
        off    = s->current_picture_ptr->f.linesize[0];
        off_uv = s->current_picture_ptr->f.linesize[1];
    } else {
        off    = 0;
        off_uv = 0;
    }
    if(s->mspel) {
        dxy = ((my & 3) << 2) | (mx & 3);
        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);
        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);
        srcY += s->linesize * 8;
        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);
        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 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)
            dsp->put_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);
        else
            dsp->put_no_rnd_pixels_tab[0][dxy](s->dest[0] + off, 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){
        dsp->put_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);
        dsp->put_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);
    }else{
        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);
        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, 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)
{
    MpegEncContext *s = &v->s;
    DSPContext *dsp = &v->s.dsp;
    uint8_t *srcY;
    int dxy, mx, my, src_x, src_y;
    int off;
    int fieldmv = (v->fcm == 1) ? v->blk_mv_type[s->block_index[n]] : 0;
    int v_edge_pos = s->v_edge_pos >> v->field_mode;
    if(!v->field_mode && !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) {
            if ((v->cur_field_type != v->ref_field_type[dir]) && v->cur_field_type)
                srcY = s->current_picture.f.data[0];
            else
                srcY = s->last_picture.f.data[0];
        } else
            srcY = s->last_picture.f.data[0];
    } else
        srcY = s->next_picture.f.data[0];

    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;
        }
        s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;
        s->current_picture.f.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 == 1) {  // 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;
        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 == 1) && fieldmv)
        off = ((n>1) ? s->linesize : 0) + (n&1) * 8;
    else
        off = s->linesize * 4 * (n&2) + (n&1) * 8;
    if (v->field_mode && v->cur_field_type)
        off += s->current_picture_ptr->f.linesize[0];

    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 == 1) {
            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 || (v->mv_mode == MV_PMODE_INTENSITY_COMP)
       || (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->dsp.emulated_edge_mc(s->edge_emu_buffer, srcY, 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(v->mv_mode == MV_PMODE_INTENSITY_COMP) {
            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] = v->luty[src[i]];
                src += s->linesize << fieldmv;
            }
        }
        srcY += s->mspel * (1 + (s->linesize << fieldmv));
    }

    if(s->mspel) {
        dxy = ((my & 3) << 2) | (mx & 3);
        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)
            dsp->put_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);
        else
            dsp->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;
    DSPContext *dsp = &v->s.dsp;
    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, off = 0;
    int v_edge_pos = s->v_edge_pos >> v->field_mode;

    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);
        if (!valid_count) {
            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;
    }
    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) {
            if ((v->cur_field_type != chroma_ref_type) && v->cur_field_type) {
                srcU = s->current_picture.f.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;
                srcV = s->current_picture.f.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;
            } else {
                srcU = s->last_picture.f.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;
                srcV = s->last_picture.f.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;
            }
        } else {
            srcU = s->last_picture.f.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;
            srcV = s->last_picture.f.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;
        }
    } else {
        srcU = s->next_picture.f.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;
        srcV = s->next_picture.f.data[2] + 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];
        }
        off = v->cur_field_type ? s->current_picture_ptr->f.linesize[1] : 0;
    }

    if(v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)
       || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9
       || (unsigned)uvsrc_y > (v_edge_pos >> 1) - 9){
        s->dsp.emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize, 8+1, 8+1,
                            uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);
        s->dsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV, 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(v->mv_mode == MV_PMODE_INTENSITY_COMP) {
            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] = v->lutuv[src[i]];
                    src2[i] = v->lutuv[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){
        dsp->put_h264_chroma_pixels_tab[0](s->dest[1] + off, srcU, s->uvlinesize, 8, uvmx, uvmy);
        dsp->put_h264_chroma_pixels_tab[0](s->dest[2] + off, srcV, s->uvlinesize, 8, uvmx, uvmy);
    }else{
        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off, srcU, s->uvlinesize, 8, uvmx, uvmy);
        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off, srcV, s->uvlinesize, 8, uvmx, uvmy);
    }
}

/** Do motion compensation for 4-MV field chroma macroblock (both U and V)
 */
static void vc1_mc_4mv_chroma4(VC1Context *v)
{
    MpegEncContext *s = &v->s;
    DSPContext *dsp = &v->s.dsp;
    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;

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

    for (i = 0; i < 4; i++) {
        tx = s->mv[0][i][0];
        uvmx_field[i] = (tx + ((tx & 3) == 3)) >> 1;
        ty = s->mv[0][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);
        srcU = s->last_picture.f.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;
        srcV = s->last_picture.f.data[2] + 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--;
        if (fieldmv && (uvsrc_y & 1) && uvsrc_y < 2)
            uvsrc_y--;
        if((v->mv_mode == MV_PMODE_INTENSITY_COMP)
            || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 5
            || (unsigned)uvsrc_y > v_edge_pos - (5 << fieldmv)){
            s->dsp.emulated_edge_mc(s->edge_emu_buffer, srcU, s->uvlinesize, 5, (5 << fieldmv), uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos);
            s->dsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV, 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(v->mv_mode == MV_PMODE_INTENSITY_COMP) {
                int i, j;
                uint8_t *src, *src2;

                src = srcU; src2 = srcV;
                for(j = 0; j < 5; j++) {
                    for(i = 0; i < 5; i++) {
                        src[i] = v->lutuv[src[i]];
                        src2[i] = v->lutuv[src2[i]];
                    }
                    src += s->uvlinesize << 1;
                    src2 += s->uvlinesize << 1;
                }
            }
        }
        if (!v->rnd) {
            dsp->put_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
            dsp->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;                                     \
  }

/**
 * @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) {
            *pred_flag = *dmv_y & 1;
            *dmv_y = (*dmv_y + *pred_flag) >> 1;
        }
    }
    else {
        if (extend_x)
            offs_tab = offset_table2;
        else
            offs_tab = offset_table1;
        index1 = (index + 1) % 9;
        if (index1 != 0) {
            val = get_bits(gb, index1 + extend_x);
            sign = 0 -(val & 1);
            *dmv_x = (sign ^ ((val >> 1) + offs_tab[index1])) - sign;
        } else
            *dmv_x = 0;
        if (extend_y)
            offs_tab = offset_table2;
        else
            offs_tab = offset_table1;
        index1 = (index + 1) / 9;
        if (index1 > v->numref) {
            val = get_bits(gb, (index1 + (extend_y << v->numref)) >> v->numref);
            sign = 0 - (val & 1);
            *dmv_y = (sign ^ ((val >> 1) + offs_tab[index1 >> v->numref])) - sign;
        } else
            *dmv_y = 0;
        if (v->numref)
            *pred_flag = 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;

    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 = vc1_field_mvpred_scales[v->second_field][1][refdist];
    scalesame2 = vc1_field_mvpred_scales[v->second_field][2][refdist];
    scalezone1_x  = vc1_field_mvpred_scales[v->second_field][3][refdist];
    zone1offset_x = vc1_field_mvpred_scales[v->second_field][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;

    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 = vc1_field_mvpred_scales[v->second_field][1][refdist];
    scalesame2 = vc1_field_mvpred_scales[v->second_field][2][refdist];
    scalezone1_y  = vc1_field_mvpred_scales[v->second_field][4][refdist];
    zone1offset_y = vc1_field_mvpred_scales[v->second_field][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  = vc1_b_field_mvpred_scales[3][brfd];
    zone1offset_x = vc1_b_field_mvpred_scales[5][brfd];
    scaleopp1 = vc1_b_field_mvpred_scales[1][brfd];
    scaleopp2 = 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  = vc1_b_field_mvpred_scales[4][brfd];
    zone1offset_y = vc1_b_field_mvpred_scales[6][brfd];
    scaleopp1 = vc1_b_field_mvpred_scales[1][brfd];
    scaleopp2 = 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;
    if (v->s.pict_type != AV_PICTURE_TYPE_B || v->second_field || !dir) {
        if (dim)
            return scaleforsame_y(v, i, n, dir);
        else
            return scaleforsame_x(v, n, dir);
    }
    brfd = FFMIN(v->brfd, 3);
    scalesame = vc1_b_field_mvpred_scales[0][brfd];
    return(n * scalesame >> 8);
}

static av_always_inline int scaleforopp(VC1Context *v, int n /* MV */, int dim, int dir)
{
    int refdist, scaleopp;
    if (v->s.pict_type == AV_PICTURE_TYPE_B && !v->second_field && dir == 1) {
        if (dim)
            return scaleforopp_y(v, n, dir);
        else
            return scaleforopp_x(v, n);
    }
    if (v->s.pict_type != AV_PICTURE_TYPE_B)
        refdist = FFMIN(v->refdist, 3);
    else
        refdist = dir ? v->brfd : v->frfd;
    scaleopp = vc1_field_mvpred_scales[v->second_field][0][refdist];
    return(n * scaleopp >> 8);
}

/** 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 opposit, f;
    int16_t samefield_pred[2], oppfield_pred[2];
    int16_t samefield_predA[2], oppfield_predA[2];
    int16_t samefield_predB[2], oppfield_predB[2];
    int16_t samefield_predC[2], oppfield_predC[2];
    int16_t *predA, *predC;
    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.f.motion_val[0][xy + v->blocks_off][0] = 0;
        s->mv[0][n][1] = s->current_picture.f.motion_val[0][xy + v->blocks_off][1] = 0;
        s->current_picture.f.motion_val[1][xy + v->blocks_off][0] = 0;
        s->current_picture.f.motion_val[1][xy + v->blocks_off][1] = 0;
        if(mv1) { /* duplicate motion data for 1-MV block */
            s->current_picture.f.motion_val[0][xy + 1 + v->blocks_off][0] = 0;
            s->current_picture.f.motion_val[0][xy + 1 + v->blocks_off][1] = 0;
            s->current_picture.f.motion_val[0][xy + wrap + v->blocks_off][0] = 0;
            s->current_picture.f.motion_val[0][xy + wrap + v->blocks_off][1] = 0;
            s->current_picture.f.motion_val[0][xy + wrap + 1 + v->blocks_off][0] = 0;
            s->current_picture.f.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.f.motion_val[1][xy + 1 + v->blocks_off][0] = 0;
            s->current_picture.f.motion_val[1][xy + 1 + v->blocks_off][1] = 0;
            s->current_picture.f.motion_val[1][xy + wrap][0] = 0;
            s->current_picture.f.motion_val[1][xy + wrap + v->blocks_off][1] = 0;
            s->current_picture.f.motion_val[1][xy + wrap + 1 + v->blocks_off][0] = 0;
            s->current_picture.f.motion_val[1][xy + wrap + 1 + v->blocks_off][1] = 0;
        }
        return;
    }

    C = s->current_picture.f.motion_val[dir][xy - 1 + v->blocks_off];
    A = s->current_picture.f.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.f.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) {
        f = v->mv_f[dir][xy - wrap + v->blocks_off];
        num_oppfield += f;
        num_samefield += 1 - f;
        if (f) {
            oppfield_predA[0] = A[0];
            oppfield_predA[1] = A[1];
            samefield_predA[0] = scaleforsame(v, 0, A[0], 0, dir);
            samefield_predA[1] = scaleforsame(v, n, A[1], 1, dir);
        } else {
            samefield_predA[0] = A[0];
            samefield_predA[1] = A[1];
            if (v->numref)
                oppfield_predA[0] = scaleforopp(v, A[0], 0, dir);
            if (v->numref)
                oppfield_predA[1] = scaleforopp(v, A[1], 1, dir);
        }
    } else {
        samefield_predA[0] = samefield_predA[1] = 0;
        oppfield_predA[0] = oppfield_predA[1] = 0;
    }
    if (c_valid) {
        f = v->mv_f[dir][xy - 1 + v->blocks_off];
        num_oppfield += f;
        num_samefield += 1 - f;
        if (f) {
            oppfield_predC[0] = C[0];
            oppfield_predC[1] = C[1];
            samefield_predC[0] = scaleforsame(v, 0, C[0], 0, dir);
            samefield_predC[1] = scaleforsame(v, n, C[1], 1, dir);
        } else {
            samefield_predC[0] = C[0];
            samefield_predC[1] = C[1];
            if (v->numref)
                oppfield_predC[0] = scaleforopp(v, C[0], 0, dir);
            if (v->numref)
                oppfield_predC[1] = scaleforopp(v, C[1], 1, dir);
        }
    } else {
        samefield_predC[0] = samefield_predC[1] = 0;
        oppfield_predC[0] = oppfield_predC[1] = 0;
    }
    if (b_valid) {
        f = v->mv_f[dir][xy - wrap + off + v->blocks_off];
        num_oppfield += f;
        num_samefield += 1 - f;
        if (f) {
            oppfield_predB[0] = B[0];
            oppfield_predB[1] = B[1];
            samefield_predB[0] = scaleforsame(v, 0, B[0], 0, dir);
            samefield_predB[1] = scaleforsame(v, n, B[1], 1, dir);
        } else {
            samefield_predB[0] = B[0];
            samefield_predB[1] = B[1];
            if (v->numref)
                oppfield_predB[0] = scaleforopp(v, B[0], 0, dir);
            if (v->numref)
                oppfield_predB[1] = scaleforopp(v, B[1], 1, dir);
        }
    } else {
        samefield_predB[0] = samefield_predB[1] = 0;
        oppfield_predB[0] = oppfield_predB[1] = 0;
    }

    if (a_valid) {
        samefield_pred[0] = samefield_predA[0];
        samefield_pred[1] = samefield_predA[1];
        oppfield_pred[0] = oppfield_predA[0];
        oppfield_pred[1] = oppfield_predA[1];
    } else if (c_valid) {
        samefield_pred[0] = samefield_predC[0];
        samefield_pred[1] = samefield_predC[1];
        oppfield_pred[0] = oppfield_predC[0];
        oppfield_pred[1] = oppfield_predC[1];
    } else if (b_valid) {
        samefield_pred[0] = samefield_predB[0];
        samefield_pred[1] = samefield_predB[1];
        oppfield_pred[0] = oppfield_predB[0];
        oppfield_pred[1] = oppfield_predB[1];
    } else {
        samefield_pred[0] = samefield_pred[1] = 0;
        oppfield_pred[0] = oppfield_pred[1] = 0;
    }

    if (num_samefield + num_oppfield > 1) {
        samefield_pred[0] = mid_pred(samefield_predA[0], samefield_predB[0], samefield_predC[0]);
        samefield_pred[1] = mid_pred(samefield_predA[1], samefield_predB[1], samefield_predC[1]);
        if (v->numref)
            oppfield_pred[0] = mid_pred(oppfield_predA[0], oppfield_predB[0], oppfield_predC[0]);
        if (v->numref)
            oppfield_pred[1] = mid_pred(oppfield_predA[1], oppfield_predB[1], oppfield_predC[1]);
    }

    if (v->field_mode) {
        if (num_samefield <= num_oppfield)
            opposit = 1 - pred_flag;
        else
            opposit = pred_flag;
    } else
        opposit = 0;
    if (opposit) {
        px = oppfield_pred[0];
        py = oppfield_pred[1];
        predA = oppfield_predA;
        predC = oppfield_predC;
        v->mv_f[dir][xy + v->blocks_off] = f = 1;
        v->ref_field_type[dir] = !v->cur_field_type;
    } else {
        px = samefield_pred[0];
        py = samefield_pred[1];
        predA = samefield_predA;
        predC = samefield_predC;
        v->mv_f[dir][xy + v->blocks_off] = f = 0;
        v->ref_field_type[dir] = v->cur_field_type;
    }

    /* 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) */
        if (v->field_mode && !s->quarter_sample)
            hybridmv_thresh = 16;
        else
            hybridmv_thresh = 32;
        if (a_valid && c_valid) {
            if (is_intra[xy - wrap])
                sum = FFABS(px) + FFABS(py);
            else
                sum = FFABS(px - predA[0]) + FFABS(py - predA[1]);
            if (sum > hybridmv_thresh) {
                if (get_bits1(&s->gb)) {     // read HYBRIDPRED bit
                    px = predA[0];
                    py = predA[1];
                } else {
                    px = predC[0];
                    py = predC[1];
                }
            } else {
                if (is_intra[xy - 1])
                    sum = FFABS(px) + FFABS(py);
                else
                    sum = FFABS(px - predC[0]) + FFABS(py - predC[1]);
                if (sum > hybridmv_thresh) {
                    if(get_bits1(&s->gb)) {
                        px = predA[0];
                        py = predA[1];
                    } else {
                        px = predC[0];
                        py = predC[1];
                    }
                }
            }
        }
    }

    if (v->field_mode && !s->quarter_sample) {
        r_x <<= 1;
        r_y <<= 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.f.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.f.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.f.motion_val[dir][xy + 1 + v->blocks_off][0] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][0];
        s->current_picture.f.motion_val[dir][xy + 1 + v->blocks_off][1] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][1];
        s->current_picture.f.motion_val[dir][xy + wrap + v->blocks_off][0] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][0];
        s->current_picture.f.motion_val[dir][xy + wrap + v->blocks_off][1] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][1];
        s->current_picture.f.motion_val[dir][xy + wrap + 1 + v->blocks_off][0] = s->current_picture.f.motion_val[dir][xy + v->blocks_off][0];
        s->current_picture.f.motion_val[dir][xy + wrap + 1 + v->blocks_off][1] = s->current_picture.f.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)
{
    MpegEncContext *s = &v->s;
    int xy, wrap, off = 0;
    int A[2], B[2], C[2];
    int px, py;
    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.f.motion_val[0][xy][0] = 0;
        s->mv[0][n][1] = s->current_picture.f.motion_val[0][xy][1] = 0;
        s->current_picture.f.motion_val[1][xy][0] = 0;
        s->current_picture.f.motion_val[1][xy][1] = 0;
        if(mvn == 1) { /* duplicate motion data for 1-MV block */
            s->current_picture.f.motion_val[0][xy + 1][0] = 0;
            s->current_picture.f.motion_val[0][xy + 1][1] = 0;
            s->current_picture.f.motion_val[0][xy + wrap][0] = 0;
            s->current_picture.f.motion_val[0][xy + wrap][1] = 0;
            s->current_picture.f.motion_val[0][xy + wrap + 1][0] = 0;
            s->current_picture.f.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.f.motion_val[1][xy + 1][0] = 0;
            s->current_picture.f.motion_val[1][xy + 1][1] = 0;
            s->current_picture.f.motion_val[1][xy + wrap][0] = 0;
            s->current_picture.f.motion_val[1][xy + wrap][1] = 0;
            s->current_picture.f.motion_val[1][xy + wrap + 1][0] = 0;
            s->current_picture.f.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.f.motion_val[0][xy - 1][0];
            A[1] = s->current_picture.f.motion_val[0][xy - 1][1];
            a_valid = 1;
        } else { // current block has frame mv and cand. has field MV (so average)
            A[0] = (s->current_picture.f.motion_val[0][xy - 1][0]
                        + s->current_picture.f.motion_val[0][xy - 1 + off*wrap][0] + 1) >> 1;
            A[1] = (s->current_picture.f.motion_val[0][xy - 1][1]
                        + s->current_picture.f.motion_val[0][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.f.motion_val[0][s->block_index[n_adj] - 2 * wrap][0];
                B[1] = s->current_picture.f.motion_val[0][s->block_index[n_adj] - 2 * wrap][1];
                if (v->blk_mv_type[pos_b] && !v->blk_mv_type[xy]) {
                    B[0] = (1 + B[0] + s->current_picture.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap][0]) >> 1;
                    B[1] = (1 + B[1] + s->current_picture.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap][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.f.motion_val[0][s->block_index[n_adj] - 2*wrap + 2][0];
                    C[1] = s->current_picture.f.motion_val[0][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.f.motion_val[0][s->block_index[n_adj ^ 2] - 2 * wrap + 2][0])) >> 1;
                        C[1] = (1 + C[1] + (s->current_picture.f.motion_val[0][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.f.motion_val[0][s->block_index[n_adj] - 2*wrap - 2][0];
                            C[1] = s->current_picture.f.motion_val[0][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.f.motion_val[0][s->block_index[1] - 2*wrap - 2][0]) >> 1;
                                C[1] = (1 + C[1] + s->current_picture.f.motion_val[0][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.f.motion_val[0][pos_b][0];
        B[1] = s->current_picture.f.motion_val[0][pos_b][1];
        pos_c = s->block_index[0];
        c_valid = 1;
        C[0] = s->current_picture.f.motion_val[0][pos_c][0];
        C[1] = s->current_picture.f.motion_val[0][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]; }
                if (b_valid) { px = B[0]; py = B[1]; }
                if (c_valid) { px = C[0]; py = C[1]; }
            } else px = py = 0;
        }
    } 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) {
                    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) {
                    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]);
        } else px = py = 0;
    }

    /* store MV using signed modulus of MV range defined in 4.11 */
    s->mv[0][n][0] = s->current_picture.f.motion_val[0][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;
    s->mv[0][n][1] = s->current_picture.f.motion_val[0][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.f.motion_val[0][xy + 1][0] = s->current_picture.f.motion_val[0][xy][0];
        s->current_picture.f.motion_val[0][xy + 1][1] = s->current_picture.f.motion_val[0][xy][1];
        s->current_picture.f.motion_val[0][xy + wrap][0] = s->current_picture.f.motion_val[0][xy][0];
        s->current_picture.f.motion_val[0][xy + wrap][1] = s->current_picture.f.motion_val[0][xy][1];
        s->current_picture.f.motion_val[0][xy + wrap + 1][0] = s->current_picture.f.motion_val[0][xy][0];
        s->current_picture.f.motion_val[0][xy + wrap + 1][1] = s->current_picture.f.motion_val[0][xy][1];
    } else if (mvn == 2) { /* duplicate motion data for 2-Field MV block */
        s->current_picture.f.motion_val[0][xy + 1][0] = s->current_picture.f.motion_val[0][xy][0];
        s->current_picture.f.motion_val[0][xy + 1][1] = s->current_picture.f.motion_val[0][xy][1];
        s->mv[0][n + 1][0] = s->mv[0][n][0];
        s->mv[0][n + 1][1] = s->mv[0][n][1];
    }
}

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

    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
       || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 16 - s->mspel*3
       || (unsigned)(src_y - s->mspel) > v_edge_pos - (my&3) - 16 - s->mspel*3){
        uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;

        srcY -= s->mspel * (1 + s->linesize);
        s->dsp.emulated_edge_mc(s->edge_emu_buffer, srcY, 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->dsp.emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, 8+1, 8+1,
                            uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);
        s->dsp.emulated_edge_mc(uvbuf + 16, srcV, 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;
            }
        }
        srcY += s->mspel * (1 + s->linesize);
    }

    if (v->field_mode && v->cur_field_type) {
        off = s->current_picture_ptr->f.linesize[0];
        off_uv = s->current_picture_ptr->f.linesize[1];
    } else {
        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)
            dsp->avg_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);
        else
            dsp->avg_no_rnd_pixels_tab[0][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){
        dsp->avg_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);
        dsp->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
}

static av_always_inline int scale_mv_intfi(int value, int bfrac, int inv, int qs, int qs_last)
{
    int n = bfrac;

    if (inv)
        n -= 256;
    n <<= !qs_last;
    if (!qs)
        return (value * n + 255) >> 9;
    else
        return (value * n + 128) >> 8;
}

/** 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(v->use_ic) {
        v->mv_mode2 = v->mv_mode;
        v->mv_mode = MV_PMODE_INTENSITY_COMP;
    }
    if(direct) {
        vc1_mc_1mv(v, 0);
        vc1_interp_mc(v);
        if(v->use_ic) v->mv_mode = v->mv_mode2;
        return;
    }
    if(mode == BMV_TYPE_INTERPOLATED) {
        vc1_mc_1mv(v, 0);
        vc1_interp_mc(v);
        if(v->use_ic) v->mv_mode = v->mv_mode2;
        return;
    }

    if(v->use_ic && (mode == BMV_TYPE_BACKWARD)) v->mv_mode = v->mv_mode2;
    vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));
    if(v->use_ic) v->mv_mode = v->mv_mode2;
}

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];

    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.f.motion_val[0][xy + v->blocks_off][0] =
        s->current_picture.f.motion_val[0][xy + v->blocks_off][1] =
        s->current_picture.f.motion_val[1][xy + v->blocks_off][0] =
        s->current_picture.f.motion_val[1][xy + v->blocks_off][1] = 0;
        return;
    }
    if (!v->field_mode) {
        s->mv[0][0][0] = scale_mv(s->next_picture.f.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);
        s->mv[0][0][1] = scale_mv(s->next_picture.f.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);
        s->mv[1][0][0] = scale_mv(s->next_picture.f.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);
        s->mv[1][0][1] = scale_mv(s->next_picture.f.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.f.motion_val[0][xy + v->blocks_off][0] = s->mv[0][0][0];
        s->current_picture.f.motion_val[0][xy + v->blocks_off][1] = s->mv[0][0][1];
        s->current_picture.f.motion_val[1][xy + v->blocks_off][0] = s->mv[1][0][0];
        s->current_picture.f.motion_val[1][xy + v->blocks_off][1] = s->mv[1][0][1];
        return;
    }

    if((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {
        C = s->current_picture.f.motion_val[0][xy - 2];
        A = s->current_picture.f.motion_val[0][xy - wrap*2];
        off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;
        B = s->current_picture.f.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.f.motion_val[1][xy - 2];
        A = s->current_picture.f.motion_val[1][xy - wrap*2];
        off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;
        B = s->current_picture.f.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.f.motion_val[0][xy][0] = s->mv[0][0][0];
    s->current_picture.f.motion_val[0][xy][1] = s->mv[0][0][1];
    s->current_picture.f.motion_val[1][xy][0] = s->mv[1][0][0];
    s->current_picture.f.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.f.mb_type[mb_pos + v->mb_off] != MB_TYPE_INTRA) {
            s->mv[0][0][0] = scale_mv_intfi(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0], v->bfraction, 0, s->quarter_sample, v->qs_last);
            s->mv[0][0][1] = scale_mv_intfi(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1], v->bfraction, 0, s->quarter_sample, v->qs_last);
            s->mv[1][0][0] = scale_mv_intfi(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0], v->bfraction, 1, s->quarter_sample, v->qs_last);
            s->mv[1][0][1] = scale_mv_intfi(s->next_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1], v->bfraction, 1, s->quarter_sample, v->qs_last);

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

    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.f.qscale_table[mb_pos];
    if(c_avail && (n!= 1 && n!=3)) {
        q2 = s->current_picture.f.qscale_table[mb_pos - 1];
        if(q2 && q2 != q1)
            c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 0x20000) >> 18;
    }
    if(a_avail && (n!= 2 && n!=3)) {
        q2 = s->current_picture.f.qscale_table[mb_pos - s->mb_stride];
        if(q2 && q2 != q1)
            a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 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.f.qscale_table[off];
        if(q2 && q2 != q1)
            b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[s->y_dc_scale_table[q1] - 1] + 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 != 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, DCTELEM 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, DCTELEM block[64], int n, int coded, int codingset, int mquant)
{
    GetBitContext *gb = &v->s.gb;
    MpegEncContext *s = &v->s;
    int dc_pred_dir = 0; /* Direction of the DC prediction used */
    int i;
    int16_t *dc_val;
    int16_t *ac_val, *ac_val2;
    int dcdiff;
    int a_avail = v->a_avail, c_avail = v->c_avail;
    int use_pred = s->ac_pred;
    int scale;
    int q1, q2 = 0;
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

    /* Get DC differential */
    if (n < 4) {
        dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
    } else {
        dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
    }
    if (dcdiff < 0){
        av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
        return -1;
    }
    if (dcdiff)
    {
        if (dcdiff == 119 /* ESC index value */)
        {
            /* TODO: Optimize */
            if (mquant == 1) dcdiff = get_bits(gb, 10);
            else if (mquant == 2) dcdiff = get_bits(gb, 9);
            else dcdiff = get_bits(gb, 8);
        }
        else
        {
            if (mquant == 1)
                dcdiff = (dcdiff<<2) + get_bits(gb, 2) - 3;
            else if (mquant == 2)
                dcdiff = (dcdiff<<1) + get_bits1(gb)   - 1;
        }
        if (get_bits1(gb))
            dcdiff = -dcdiff;
    }

    /* Prediction */
    dcdiff += 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.f.qscale_table[mb_pos];
    if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.f.qscale_table[mb_pos - 1];
    if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.f.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 == 1) {
                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 != 1)
                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(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;
                    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;
                    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, DCTELEM block[64], int n, int coded, int mquant, int codingset)
{
    GetBitContext *gb = &v->s.gb;
    MpegEncContext *s = &v->s;
    int dc_pred_dir = 0; /* Direction of the DC prediction used */
    int i;
    int16_t *dc_val;
    int16_t *ac_val, *ac_val2;
    int dcdiff;
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
    int a_avail = v->a_avail, c_avail = v->c_avail;
    int use_pred = s->ac_pred;
    int scale;
    int q1, q2 = 0;

    s->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.f.qscale_table[mb_pos];
    if(dc_pred_dir && c_avail && mb_pos) q2 = s->current_picture.f.qscale_table[mb_pos - 1];
    if(!dc_pred_dir && a_avail && mb_pos >= s->mb_stride) q2 = s->current_picture.f.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 == 0)
                block[v->zz_8x8[0][i++]] = value;
            else {
                if(use_pred && (v->fcm == 1)) {
                    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(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;
                    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;
                    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, DCTELEM 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->interlace)
                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->interlace)
                    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->interlace)
                    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->interlace)
                    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.f.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.f.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 preceedes 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; /* Loosy initialization */

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

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

            if (s->mb_intra) {
                s->current_picture.f.motion_val[1][s->block_index[0]][0] = 0;
                s->current_picture.f.motion_val[1][s->block_index[0]][1] = 0;
            }
            s->current_picture.f.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.f.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.f.mb_type[mb_pos] = MB_TYPE_SKIP;
            s->current_picture.f.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);
        }
    } //1MV mode
    else //4MV mode
    {
        if (!skipped /* unskipped MB */)
        {
            int intra_count = 0, coded_inter = 0;
            int is_intra[6], is_coded[6];
            /* Get CBPCY */
            cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
            for (i=0; i<6; i++)
            {
                val = ((cbp >> (5 - i)) & 1);
                s->dc_val[0][s->block_index[i]] = 0;
                s->mb_intra = 0;
                if(i < 4) {
                    dmv_x = dmv_y = 0;
                    s->mb_intra = 0;
                    mb_has_coeffs = 0;
                    if(val) {
                        GET_MVDATA(dmv_x, dmv_y);
                    }
                    vc1_pred_mv(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);
                    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.f.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.f.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);
            }
            vc1_mc_4mv_chroma(v, 0);