/*****************************************************************************
 * macroblock.c: macroblock common functions
 *****************************************************************************
 * Copyright (C) 2003-2018 x264 project
 *
 * Authors: Fiona Glaser <fiona@x264.com>
 *          Laurent Aimar <fenrir@via.ecp.fr>
 *          Loren Merritt <lorenm@u.washington.edu>
 *          Henrik Gramner <henrik@gramner.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
 *
 * This program is also available under a commercial proprietary license.
 * For more information, contact us at licensing@x264.com.
 *****************************************************************************/

#include "common.h"

#define MC_LUMA(list,p) \
    h->mc.mc_luma( &h->mb.pic.p_fdec[p][4*y*FDEC_STRIDE+4*x], FDEC_STRIDE, \
                   &h->mb.pic.p_fref[list][i_ref][p*4], h->mb.pic.i_stride[p], \
                   mvx, mvy, 4*width, 4*height, \
                   list ? x264_weight_none : &h->sh.weight[i_ref][p] );

static NOINLINE void mb_mc_0xywh( x264_t *h, int x, int y, int width, int height )
{
    int i8    = x264_scan8[0]+x+8*y;
    int i_ref = h->mb.cache.ref[0][i8];
    int mvx   = x264_clip3( h->mb.cache.mv[0][i8][0], h->mb.mv_min[0], h->mb.mv_max[0] ) + 4*4*x;
    int mvy   = x264_clip3( h->mb.cache.mv[0][i8][1], h->mb.mv_min[1], h->mb.mv_max[1] ) + 4*4*y;

    MC_LUMA( 0, 0 );

    if( CHROMA444 )
    {
        MC_LUMA( 0, 1 );
        MC_LUMA( 0, 2 );
    }
    else
    {
        int v_shift = CHROMA_V_SHIFT;
        // Chroma in 4:2:0 is offset if MCing from a field of opposite parity
        if( v_shift & MB_INTERLACED & i_ref )
            mvy += (h->mb.i_mb_y & 1)*4 - 2;

        int offset = (4*FDEC_STRIDE>>v_shift)*y + 2*x;
        height = 4*height >> v_shift;

        h->mc.mc_chroma( &h->mb.pic.p_fdec[1][offset],
                         &h->mb.pic.p_fdec[2][offset], FDEC_STRIDE,
                         h->mb.pic.p_fref[0][i_ref][4], h->mb.pic.i_stride[1],
                         mvx, 2*mvy>>v_shift, 2*width, height );

        if( h->sh.weight[i_ref][1].weightfn )
            h->sh.weight[i_ref][1].weightfn[width>>1]( &h->mb.pic.p_fdec[1][offset], FDEC_STRIDE,
                                                       &h->mb.pic.p_fdec[1][offset], FDEC_STRIDE,
                                                       &h->sh.weight[i_ref][1], height );
        if( h->sh.weight[i_ref][2].weightfn )
            h->sh.weight[i_ref][2].weightfn[width>>1]( &h->mb.pic.p_fdec[2][offset], FDEC_STRIDE,
                                                       &h->mb.pic.p_fdec[2][offset], FDEC_STRIDE,
                                                       &h->sh.weight[i_ref][2], height );
    }
}
static NOINLINE void mb_mc_1xywh( x264_t *h, int x, int y, int width, int height )
{
    int i8    = x264_scan8[0]+x+8*y;
    int i_ref = h->mb.cache.ref[1][i8];
    int mvx   = x264_clip3( h->mb.cache.mv[1][i8][0], h->mb.mv_min[0], h->mb.mv_max[0] ) + 4*4*x;
    int mvy   = x264_clip3( h->mb.cache.mv[1][i8][1], h->mb.mv_min[1], h->mb.mv_max[1] ) + 4*4*y;

    MC_LUMA( 1, 0 );

    if( CHROMA444 )
    {
        MC_LUMA( 1, 1 );
        MC_LUMA( 1, 2 );
    }
    else
    {
        int v_shift = CHROMA_V_SHIFT;
        if( v_shift & MB_INTERLACED & i_ref )
            mvy += (h->mb.i_mb_y & 1)*4 - 2;

        int offset = (4*FDEC_STRIDE>>v_shift)*y + 2*x;
        h->mc.mc_chroma( &h->mb.pic.p_fdec[1][offset],
                         &h->mb.pic.p_fdec[2][offset], FDEC_STRIDE,
                         h->mb.pic.p_fref[1][i_ref][4], h->mb.pic.i_stride[1],
                         mvx, 2*mvy>>v_shift, 2*width, 4*height>>v_shift );
    }
}

#define MC_LUMA_BI(p) \
    src0 = h->mc.get_ref( tmp0, &i_stride0, &h->mb.pic.p_fref[0][i_ref0][p*4], h->mb.pic.i_stride[p], \
                          mvx0, mvy0, 4*width, 4*height, x264_weight_none ); \
    src1 = h->mc.get_ref( tmp1, &i_stride1, &h->mb.pic.p_fref[1][i_ref1][p*4], h->mb.pic.i_stride[p], \
                          mvx1, mvy1, 4*width, 4*height, x264_weight_none ); \
    h->mc.avg[i_mode]( &h->mb.pic.p_fdec[p][4*y*FDEC_STRIDE+4*x], FDEC_STRIDE, \
                       src0, i_stride0, src1, i_stride1, weight );

static NOINLINE void mb_mc_01xywh( x264_t *h, int x, int y, int width, int height )
{
    int i8 = x264_scan8[0]+x+8*y;
    int i_ref0 = h->mb.cache.ref[0][i8];
    int i_ref1 = h->mb.cache.ref[1][i8];
    int weight = h->mb.bipred_weight[i_ref0][i_ref1];
    int mvx0   = x264_clip3( h->mb.cache.mv[0][i8][0], h->mb.mv_min[0], h->mb.mv_max[0] ) + 4*4*x;
    int mvx1   = x264_clip3( h->mb.cache.mv[1][i8][0], h->mb.mv_min[0], h->mb.mv_max[0] ) + 4*4*x;
    int mvy0   = x264_clip3( h->mb.cache.mv[0][i8][1], h->mb.mv_min[1], h->mb.mv_max[1] ) + 4*4*y;
    int mvy1   = x264_clip3( h->mb.cache.mv[1][i8][1], h->mb.mv_min[1], h->mb.mv_max[1] ) + 4*4*y;
    int i_mode = x264_size2pixel[height][width];
    intptr_t i_stride0 = 16, i_stride1 = 16;
    ALIGNED_ARRAY_32( pixel, tmp0,[16*16] );
    ALIGNED_ARRAY_32( pixel, tmp1,[16*16] );
    pixel *src0, *src1;

    MC_LUMA_BI( 0 );

    if( CHROMA444 )
    {
        MC_LUMA_BI( 1 );
        MC_LUMA_BI( 2 );
    }
    else
    {
        int v_shift = CHROMA_V_SHIFT;
        if( v_shift & MB_INTERLACED & i_ref0 )
            mvy0 += (h->mb.i_mb_y & 1)*4 - 2;
        if( v_shift & MB_INTERLACED & i_ref1 )
            mvy1 += (h->mb.i_mb_y & 1)*4 - 2;

        h->mc.mc_chroma( tmp0, tmp0+8, 16, h->mb.pic.p_fref[0][i_ref0][4], h->mb.pic.i_stride[1],
                         mvx0, 2*mvy0>>v_shift, 2*width, 4*height>>v_shift );
        h->mc.mc_chroma( tmp1, tmp1+8, 16, h->mb.pic.p_fref[1][i_ref1][4], h->mb.pic.i_stride[1],
                         mvx1, 2*mvy1>>v_shift, 2*width, 4*height>>v_shift );

        int chromapix = h->luma2chroma_pixel[i_mode];
        int offset = (4*FDEC_STRIDE>>v_shift)*y + 2*x;
        h->mc.avg[chromapix]( &h->mb.pic.p_fdec[1][offset], FDEC_STRIDE, tmp0,   16, tmp1,   16, weight );
        h->mc.avg[chromapix]( &h->mb.pic.p_fdec[2][offset], FDEC_STRIDE, tmp0+8, 16, tmp1+8, 16, weight );
    }
}

#undef MC_LUMA
#undef MC_LUMA_BI

void x264_mb_mc_8x8( x264_t *h, int i8 )
{
    int x = 2*(i8&1);
    int y = 2*(i8>>1);

    if( h->sh.i_type == SLICE_TYPE_P )
    {
        switch( h->mb.i_sub_partition[i8] )
        {
            case D_L0_8x8:
                mb_mc_0xywh( h, x, y, 2, 2 );
                break;
            case D_L0_8x4:
                mb_mc_0xywh( h, x, y+0, 2, 1 );
                mb_mc_0xywh( h, x, y+1, 2, 1 );
                break;
            case D_L0_4x8:
                mb_mc_0xywh( h, x+0, y, 1, 2 );
                mb_mc_0xywh( h, x+1, y, 1, 2 );
                break;
            case D_L0_4x4:
                mb_mc_0xywh( h, x+0, y+0, 1, 1 );
                mb_mc_0xywh( h, x+1, y+0, 1, 1 );
                mb_mc_0xywh( h, x+0, y+1, 1, 1 );
                mb_mc_0xywh( h, x+1, y+1, 1, 1 );
                break;
        }
    }
    else
    {
        int scan8 = x264_scan8[0] + x + 8*y;

        if( h->mb.cache.ref[0][scan8] >= 0 )
            if( h->mb.cache.ref[1][scan8] >= 0 )
                mb_mc_01xywh( h, x, y, 2, 2 );
            else
                mb_mc_0xywh( h, x, y, 2, 2 );
        else
            mb_mc_1xywh( h, x, y, 2, 2 );
    }
}

void x264_mb_mc( x264_t *h )
{
    if( h->mb.i_partition == D_8x8 )
    {
        for( int i = 0; i < 4; i++ )
            x264_mb_mc_8x8( h, i );
    }
    else
    {
        int ref0a = h->mb.cache.ref[0][x264_scan8[ 0]];
        int ref0b = h->mb.cache.ref[0][x264_scan8[12]];
        int ref1a = h->mb.cache.ref[1][x264_scan8[ 0]];
        int ref1b = h->mb.cache.ref[1][x264_scan8[12]];

        if( h->mb.i_partition == D_16x16 )
        {
            if( ref0a >= 0 )
                if( ref1a >= 0 ) mb_mc_01xywh( h, 0, 0, 4, 4 );
                else             mb_mc_0xywh ( h, 0, 0, 4, 4 );
            else                 mb_mc_1xywh ( h, 0, 0, 4, 4 );
        }
        else if( h->mb.i_partition == D_16x8 )
        {
            if( ref0a >= 0 )
                if( ref1a >= 0 ) mb_mc_01xywh( h, 0, 0, 4, 2 );
                else             mb_mc_0xywh ( h, 0, 0, 4, 2 );
            else                 mb_mc_1xywh ( h, 0, 0, 4, 2 );

            if( ref0b >= 0 )
                if( ref1b >= 0 ) mb_mc_01xywh( h, 0, 2, 4, 2 );
                else             mb_mc_0xywh ( h, 0, 2, 4, 2 );
            else                 mb_mc_1xywh ( h, 0, 2, 4, 2 );
        }
        else if( h->mb.i_partition == D_8x16 )
        {
            if( ref0a >= 0 )
                if( ref1a >= 0 ) mb_mc_01xywh( h, 0, 0, 2, 4 );
                else             mb_mc_0xywh ( h, 0, 0, 2, 4 );
            else                 mb_mc_1xywh ( h, 0, 0, 2, 4 );

            if( ref0b >= 0 )
                if( ref1b >= 0 ) mb_mc_01xywh( h, 2, 0, 2, 4 );
                else             mb_mc_0xywh ( h, 2, 0, 2, 4 );
            else                 mb_mc_1xywh ( h, 2, 0, 2, 4 );
        }
    }
}

int x264_macroblock_cache_allocate( x264_t *h )
{
    int i_mb_count = h->mb.i_mb_count;

    h->mb.i_mb_stride = h->mb.i_mb_width;
    h->mb.i_b8_stride = h->mb.i_mb_width * 2;
    h->mb.i_b4_stride = h->mb.i_mb_width * 4;

    h->mb.b_interlaced = PARAM_INTERLACED;

    PREALLOC_INIT

    PREALLOC( h->mb.qp, i_mb_count * sizeof(int8_t) );
    PREALLOC( h->mb.cbp, i_mb_count * sizeof(int16_t) );
    PREALLOC( h->mb.mb_transform_size, i_mb_count * sizeof(int8_t) );
    PREALLOC( h->mb.slice_table, i_mb_count * sizeof(uint32_t) );

    /* 0 -> 3 top(4), 4 -> 6 : left(3) */
    PREALLOC( h->mb.intra4x4_pred_mode, i_mb_count * 8 * sizeof(int8_t) );

    /* all coeffs */
    PREALLOC( h->mb.non_zero_count, i_mb_count * 48 * sizeof(uint8_t) );

    if( h->param.b_cabac )
    {
        PREALLOC( h->mb.skipbp, i_mb_count * sizeof(int8_t) );
        PREALLOC( h->mb.chroma_pred_mode, i_mb_count * sizeof(int8_t) );
        PREALLOC( h->mb.mvd[0], i_mb_count * sizeof( **h->mb.mvd ) );
        if( h->param.i_bframe )
            PREALLOC( h->mb.mvd[1], i_mb_count * sizeof( **h->mb.mvd ) );
    }

    for( int i = 0; i < 2; i++ )
    {
        int i_refs = X264_MIN(X264_REF_MAX, (i ? 1 + !!h->param.i_bframe_pyramid : h->param.i_frame_reference) ) << PARAM_INTERLACED;
        if( h->param.analyse.i_weighted_pred == X264_WEIGHTP_SMART )
            i_refs = X264_MIN(X264_REF_MAX, i_refs + 1 + (BIT_DEPTH == 8)); //smart weights add two duplicate frames, one in >8-bit

        for( int j = !i; j < i_refs; j++ )
            PREALLOC( h->mb.mvr[i][j], 2 * (i_mb_count + 1) * sizeof(int16_t) );
    }

    if( h->param.analyse.i_weighted_pred )
    {
        int i_padv = PADV << PARAM_INTERLACED;
        int luma_plane_size = 0;
        int numweightbuf;

        if( h->param.analyse.i_weighted_pred == X264_WEIGHTP_FAKE )
        {
            // only need buffer for lookahead
            if( !h->param.i_sync_lookahead || h == h->thread[h->param.i_threads] )
            {
                // Fake analysis only works on lowres
                luma_plane_size = h->fdec->i_stride_lowres * (h->mb.i_mb_height*8+2*i_padv);
                // Only need 1 buffer for analysis
                numweightbuf = 1;
            }
            else
                numweightbuf = 0;
        }
        else
        {
            /* Both ref and fenc is stored for 4:2:0 and 4:2:2 which means that 4:2:0 and 4:4:4
             * needs the same amount of space and 4:2:2 needs twice that much */
            luma_plane_size = h->fdec->i_stride[0] * (h->mb.i_mb_height*(16<<(CHROMA_FORMAT==CHROMA_422))+2*i_padv);

            if( h->param.analyse.i_weighted_pred == X264_WEIGHTP_SMART )
                //smart can weight one ref and one offset -1 in 8-bit
                numweightbuf = 1 + (BIT_DEPTH == 8);
            else
                //simple only has one weighted ref
                numweightbuf = 1;
        }

        for( int i = 0; i < numweightbuf; i++ )
            PREALLOC( h->mb.p_weight_buf[i], luma_plane_size * sizeof(pixel) );
    }

    PREALLOC_END( h->mb.base );

    memset( h->mb.slice_table, -1, i_mb_count * sizeof(uint32_t) );

    for( int i = 0; i < 2; i++ )
    {
        int i_refs = X264_MIN(X264_REF_MAX, (i ? 1 + !!h->param.i_bframe_pyramid : h->param.i_frame_reference) ) << PARAM_INTERLACED;
        if( h->param.analyse.i_weighted_pred == X264_WEIGHTP_SMART )
            i_refs = X264_MIN(X264_REF_MAX, i_refs + 1 + (BIT_DEPTH == 8)); //smart weights add two duplicate frames, one in >8-bit

        for( int j = !i; j < i_refs; j++ )
        {
            M32( h->mb.mvr[i][j][0] ) = 0;
            h->mb.mvr[i][j]++;
        }
    }

    return 0;
fail:
    return -1;
}
void x264_macroblock_cache_free( x264_t *h )
{
    x264_free( h->mb.base );
}

int x264_macroblock_thread_allocate( x264_t *h, int b_lookahead )
{
    if( !b_lookahead )
    {
        for( int i = 0; i < (PARAM_INTERLACED ? 5 : 2); i++ )
            for( int j = 0; j < (CHROMA444 ? 3 : 2); j++ )
            {
                CHECKED_MALLOC( h->intra_border_backup[i][j], (h->sps->i_mb_width*16+32) * sizeof(pixel) );
                h->intra_border_backup[i][j] += 16;
            }
        for( int i = 0; i <= PARAM_INTERLACED; i++ )
        {
            if( h->param.b_sliced_threads )
            {
                /* Only allocate the first one, and allocate it for the whole frame, because we
                 * won't be deblocking until after the frame is fully encoded. */
                if( h == h->thread[0] && !i )
                    CHECKED_MALLOC( h->deblock_strength[0], sizeof(**h->deblock_strength) * h->mb.i_mb_count );
                else
                    h->deblock_strength[i] = h->thread[0]->deblock_strength[0];
            }
            else
                CHECKED_MALLOC( h->deblock_strength[i], sizeof(**h->deblock_strength) * h->mb.i_mb_width );
            h->deblock_strength[1] = h->deblock_strength[i];
        }
    }

    /* Allocate scratch buffer */
    int scratch_size = 0;
    if( !b_lookahead )
    {
        int buf_hpel = (h->thread[0]->fdec->i_width[0]+48+32) * sizeof(int16_t);
        int buf_ssim = h->param.analyse.b_ssim * 8 * (h->param.i_width/4+3) * sizeof(int);
        int me_range = X264_MIN(h->param.analyse.i_me_range, h->param.analyse.i_mv_range);
        int buf_tesa = (h->param.analyse.i_me_method >= X264_ME_ESA) *
            ((me_range*2+24) * sizeof(int16_t) + (me_range+4) * (me_range+1) * 4 * sizeof(mvsad_t));
        scratch_size = X264_MAX3( buf_hpel, buf_ssim, buf_tesa );
    }
    int buf_mbtree = h->param.rc.b_mb_tree * ((h->mb.i_mb_width+15)&~15) * sizeof(int16_t);
    scratch_size = X264_MAX( scratch_size, buf_mbtree );
    if( scratch_size )
        CHECKED_MALLOC( h->scratch_buffer, scratch_size );
    else
        h->scratch_buffer = NULL;

    int buf_lookahead_threads = (h->mb.i_mb_height + (4 + 32) * h->param.i_lookahead_threads) * sizeof(int) * 2;
    int buf_mbtree2 = buf_mbtree * 12; /* size of the internal propagate_list asm buffer */
    scratch_size = X264_MAX( buf_lookahead_threads, buf_mbtree2 );
    CHECKED_MALLOC( h->scratch_buffer2, scratch_size );

    return 0;
fail:
    return -1;
}

void x264_macroblock_thread_free( x264_t *h, int b_lookahead )
{
    if( !b_lookahead )
    {
        for( int i = 0; i <= PARAM_INTERLACED; i++ )
            if( !h->param.b_sliced_threads || (h == h->thread[0] && !i) )
                x264_free( h->deblock_strength[i] );
        for( int i = 0; i < (PARAM_INTERLACED ? 5 : 2); i++ )
            for( int j = 0; j < (CHROMA444 ? 3 : 2); j++ )
                x264_free( h->intra_border_backup[i][j] - 16 );
    }
    x264_free( h->scratch_buffer );
    x264_free( h->scratch_buffer2 );
}

void x264_macroblock_slice_init( x264_t *h )
{
    h->mb.mv[0] = h->fdec->mv[0];
    h->mb.mv[1] = h->fdec->mv[1];
    h->mb.mvr[0][0] = h->fdec->mv16x16;
    h->mb.ref[0] = h->fdec->ref[0];
    h->mb.ref[1] = h->fdec->ref[1];
    h->mb.type = h->fdec->mb_type;
    h->mb.partition = h->fdec->mb_partition;
    h->mb.field = h->fdec->field;

    h->fdec->i_ref[0] = h->i_ref[0];
    h->fdec->i_ref[1] = h->i_ref[1];
    for( int i = 0; i < h->i_ref[0]; i++ )
        h->fdec->ref_poc[0][i] = h->fref[0][i]->i_poc;
    if( h->sh.i_type == SLICE_TYPE_B )
    {
        for( int i = 0; i < h->i_ref[1]; i++ )
            h->fdec->ref_poc[1][i] = h->fref[1][i]->i_poc;

        map_col_to_list0(-1) = -1;
        map_col_to_list0(-2) = -2;
        for( int i = 0; i < h->fref[1][0]->i_ref[0]; i++ )
        {
            int poc = h->fref[1][0]->ref_poc[0][i];
            map_col_to_list0(i) = -2;
            for( int j = 0; j < h->i_ref[0]; j++ )
                if( h->fref[0][j]->i_poc == poc )
                {
                    map_col_to_list0(i) = j;
                    break;
                }
        }
    }
    else if( h->sh.i_type == SLICE_TYPE_P )
    {
        if( h->sh.i_disable_deblocking_filter_idc != 1 && h->param.analyse.i_weighted_pred == X264_WEIGHTP_SMART )
        {
            deblock_ref_table(-2) = -2;
            deblock_ref_table(-1) = -1;
            for( int i = 0; i < h->i_ref[0] << SLICE_MBAFF; i++ )
            {
                /* Mask off high bits to avoid frame num collisions with -1/-2.
                 * In current x264 frame num values don't cover a range of more
                 * than 32, so 6 bits is enough for uniqueness. */
                if( !MB_INTERLACED )
                    deblock_ref_table(i) = h->fref[0][i]->i_frame_num&63;
                else
                    deblock_ref_table(i) = ((h->fref[0][i>>1]->i_frame_num&63)<<1) + (i&1);
            }
        }
    }

    /* init with not available (for top right idx=7,15) */
    memset( h->mb.cache.ref, -2, sizeof( h->mb.cache.ref ) );

    if( h->i_ref[0] > 0 )
        for( int field = 0; field <= SLICE_MBAFF; field++ )
        {
            int curpoc = h->fdec->i_poc + h->fdec->i_delta_poc[field];
            int refpoc = h->fref[0][0]->i_poc + h->fref[0][0]->i_delta_poc[field];
            int delta = curpoc - refpoc;

            h->fdec->inv_ref_poc[field] = (256 + delta/2) / delta;
        }

    h->mb.i_neighbour4[6] =
    h->mb.i_neighbour4[9] =
    h->mb.i_neighbour4[12] =
    h->mb.i_neighbour4[14] = MB_LEFT|MB_TOP|MB_TOPLEFT|MB_TOPRIGHT;
    h->mb.i_neighbour4[3] =
    h->mb.i_neighbour4[7] =
    h->mb.i_neighbour4[11] =
    h->mb.i_neighbour4[13] =
    h->mb.i_neighbour4[15] =
    h->mb.i_neighbour8[3] = MB_LEFT|MB_TOP|MB_TOPLEFT;
}

void x264_macroblock_thread_init( x264_t *h )
{
    h->mb.i_me_method = h->param.analyse.i_me_method;
    h->mb.i_subpel_refine = h->param.analyse.i_subpel_refine;
    if( h->sh.i_type == SLICE_TYPE_B && (h->mb.i_subpel_refine == 6 || h->mb.i_subpel_refine == 8) )
        h->mb.i_subpel_refine--;
    h->mb.b_chroma_me = h->param.analyse.b_chroma_me &&
                        ((h->sh.i_type == SLICE_TYPE_P && h->mb.i_subpel_refine >= 5) ||
                         (h->sh.i_type == SLICE_TYPE_B && h->mb.i_subpel_refine >= 9));
    h->mb.b_dct_decimate = h->sh.i_type == SLICE_TYPE_B ||
                          (h->param.analyse.b_dct_decimate && h->sh.i_type != SLICE_TYPE_I);
    h->mb.i_mb_prev_xy = -1;

    /*          4:2:0                      4:2:2                      4:4:4
     * fdec            fenc       fdec            fenc       fdec            fenc
     * y y y y y y y   Y Y Y Y    y y y y y y y   Y Y Y Y    y y y y y y y   Y Y Y Y
     * y Y Y Y Y       Y Y Y Y    y Y Y Y Y       Y Y Y Y    y Y Y Y Y       Y Y Y Y
     * y Y Y Y Y       Y Y Y Y    y Y Y Y Y       Y Y Y Y    y Y Y Y Y       Y Y Y Y
     * y Y Y Y Y       Y Y Y Y    y Y Y Y Y       Y Y Y Y    y Y Y Y Y       Y Y Y Y
     * y Y Y Y Y       U U V V    y Y Y Y Y       U U V V    y Y Y Y Y       U U U U
     * u u u   v v v   U U V V    u u u   v v v   U U V V    u u u u u u u   U U U U
     * u U U   v V V              u U U   v V V   U U V V    u U U U U       U U U U
     * u U U   v V V              u U U   v V V   U U V V    u U U U U       U U U U
     *                            u U U   v V V              u U U U U       V V V V
     *                            u U U   v V V              u U U U U       V V V V
     *                                                       v v v v v v v   V V V V
     *                                                       v V V V V       V V V V
     *                                                       v V V V V
     *                                                       v V V V V
     *                                                       v V V V V
     */
    h->mb.pic.p_fenc[0] = h->mb.pic.fenc_buf;
    h->mb.pic.p_fdec[0] = h->mb.pic.fdec_buf + 2*FDEC_STRIDE;
    h->mb.pic.p_fenc[1] = h->mb.pic.fenc_buf + 16*FENC_STRIDE;
    h->mb.pic.p_fdec[1] = h->mb.pic.fdec_buf + 20*FDEC_STRIDE;
    if( CHROMA444 )
    {
        h->mb.pic.p_fenc[2] = h->mb.pic.fenc_buf + 32*FENC_STRIDE;
        h->mb.pic.p_fdec[2] = h->mb.pic.fdec_buf + 38*FDEC_STRIDE;
    }
    else
    {
        h->mb.pic.p_fenc[2] = h->mb.pic.fenc_buf + 16*FENC_STRIDE + 8;
        h->mb.pic.p_fdec[2] = h->mb.pic.fdec_buf + 20*FDEC_STRIDE + 16;
    }
}

void x264_prefetch_fenc( x264_t *h, x264_frame_t *fenc, int i_mb_x, int i_mb_y )
{
    int stride_y  = fenc->i_stride[0];
    int stride_uv = fenc->i_stride[1];
    int off_y  = 16 * i_mb_x + 16 * i_mb_y * stride_y;
    int off_uv = 16 * i_mb_x + (16 * i_mb_y * stride_uv >> CHROMA_V_SHIFT);
    h->mc.prefetch_fenc( fenc->plane[0]+off_y, stride_y,
                         fenc->plane[1]+off_uv, stride_uv, i_mb_x );
}

NOINLINE void x264_copy_column8( pixel *dst, pixel *src )
{
    // input pointers are offset by 4 rows because that's faster (smaller instruction size on x86)
    for( int i = -4; i < 4; i++ )
        dst[i*FDEC_STRIDE] = src[i*FDEC_STRIDE];
}

static void ALWAYS_INLINE macroblock_load_pic_pointers( x264_t *h, int mb_x, int mb_y, int i, int b_chroma, int b_mbaff )
{
    int mb_interlaced = b_mbaff && MB_INTERLACED;
    int height = b_chroma ? 16 >> CHROMA_V_SHIFT : 16;
    int i_stride = h->fdec->i_stride[i];
    int i_stride2 = i_stride << mb_interlaced;
    int i_pix_offset = mb_interlaced
                     ? 16 * mb_x + height * (mb_y&~1) * i_stride + (mb_y&1) * i_stride
                     : 16 * mb_x + height * mb_y * i_stride;
    pixel *plane_fdec = &h->fdec->plane[i][i_pix_offset];
    int fdec_idx = b_mbaff ? (mb_interlaced ? (3 + (mb_y&1)) : (mb_y&1) ? 2 : 4) : !(mb_y&1);
    pixel *intra_fdec = &h->intra_border_backup[fdec_idx][i][mb_x*16];
    int ref_pix_offset[2] = { i_pix_offset, i_pix_offset };
    /* ref_pix_offset[0] references the current field and [1] the opposite field. */
    if( mb_interlaced )
        ref_pix_offset[1] += (1-2*(mb_y&1)) * i_stride;
    h->mb.pic.i_stride[i] = i_stride2;
    h->mb.pic.p_fenc_plane[i] = &h->fenc->plane[i][i_pix_offset];
    if( b_chroma )
    {
        h->mc.load_deinterleave_chroma_fenc( h->mb.pic.p_fenc[1], h->mb.pic.p_fenc_plane[1], i_stride2, height );
        memcpy( h->mb.pic.p_fdec[1]-FDEC_STRIDE, intra_fdec, 8*sizeof(pixel) );
        memcpy( h->mb.pic.p_fdec[2]-FDEC_STRIDE, intra_fdec+8, 8*sizeof(pixel) );
        h->mb.pic.p_fdec[1][-FDEC_STRIDE-1] = intra_fdec[-1-8];
        h->mb.pic.p_fdec[2][-FDEC_STRIDE-1] = intra_fdec[-1];
    }
    else
    {
        h->mc.copy[PIXEL_16x16]( h->mb.pic.p_fenc[i], FENC_STRIDE, h->mb.pic.p_fenc_plane[i], i_stride2, 16 );
        memcpy( h->mb.pic.p_fdec[i]-FDEC_STRIDE, intra_fdec, 24*sizeof(pixel) );
        h->mb.pic.p_fdec[i][-FDEC_STRIDE-1] = intra_fdec[-1];
    }
    if( b_mbaff || h->mb.b_reencode_mb )
    {
        for( int j = 0; j < height; j++ )
            if( b_chroma )
            {
                h->mb.pic.p_fdec[1][-1+j*FDEC_STRIDE] = plane_fdec[-2+j*i_stride2];
                h->mb.pic.p_fdec[2][-1+j*FDEC_STRIDE] = plane_fdec[-1+j*i_stride2];
            }
            else
                h->mb.pic.p_fdec[i][-1+j*FDEC_STRIDE] = plane_fdec[-1+j*i_stride2];
    }
    pixel *plane_src, **filtered_src;
    for( int j = 0; j < h->mb.pic.i_fref[0]; j++ )
    {
        // Interpolate between pixels in same field.
        if( mb_interlaced )
        {
            plane_src = h->fref[0][j>>1]->plane_fld[i];
            filtered_src = h->fref[0][j>>1]->filtered_fld[i];
        }
        else
        {
            plane_src = h->fref[0][j]->plane[i];
            filtered_src = h->fref[0][j]->filtered[i];
        }
        h->mb.pic.p_fref[0][j][i*4] = plane_src + ref_pix_offset[j&1];

        if( !b_chroma )
        {
            for( int k = 1; k < 4; k++ )
                h->mb.pic.p_fref[0][j][i*4+k] = filtered_src[k] + ref_pix_offset[j&1];
            if( !i )
            {
                if( h->sh.weight[j][0].weightfn )
                    h->mb.pic.p_fref_w[j] = &h->fenc->weighted[j >> mb_interlaced][ref_pix_offset[j&1]];
                else
                    h->mb.pic.p_fref_w[j] = h->mb.pic.p_fref[0][j][0];
            }
        }
    }
    if( h->sh.i_type == SLICE_TYPE_B )
        for( int j = 0; j < h->mb.pic.i_fref[1]; j++ )
        {
            if( mb_interlaced )
            {
                plane_src = h->fref[1][j>>1]->plane_fld[i];
                filtered_src = h->fref[1][j>>1]->filtered_fld[i];
            }
            else
            {
                plane_src = h->fref[1][j]->plane[i];
                filtered_src = h->fref[1][j]->filtered[i];
            }
            h->mb.pic.p_fref[1][j][i*4] = plane_src + ref_pix_offset[j&1];

            if( !b_chroma )
                for( int k = 1; k < 4; k++ )
                    h->mb.pic.p_fref[1][j][i*4+k] = filtered_src[k] + ref_pix_offset[j&1];
        }
}

static const x264_left_table_t left_indices[4] =
{
    /* Current is progressive */
    {{ 4, 4, 5, 5}, { 3,  3,  7,  7}, {16+1, 16+1, 32+1, 32+1}, {0, 0, 1, 1}, {0, 0, 0, 0}},
    {{ 6, 6, 3, 3}, {11, 11, 15, 15}, {16+5, 16+5, 32+5, 32+5}, {2, 2, 3, 3}, {1, 1, 1, 1}},
    /* Current is interlaced */
    {{ 4, 6, 4, 6}, { 3, 11,  3, 11}, {16+1, 16+1, 32+1, 32+1}, {0, 2, 0, 2}, {0, 1, 0, 1}},
    /* Both same */
    {{ 4, 5, 6, 3}, { 3,  7, 11, 15}, {16+1, 16+5, 32+1, 32+5}, {0, 1, 2, 3}, {0, 0, 1, 1}}
};

static void ALWAYS_INLINE macroblock_cache_load_neighbours( x264_t *h, int mb_x, int mb_y, int b_interlaced )
{
    const int mb_interlaced = b_interlaced && MB_INTERLACED;
    int top_y = mb_y - (1 << mb_interlaced);
    int top = top_y * h->mb.i_mb_stride + mb_x;

    h->mb.i_mb_x = mb_x;
    h->mb.i_mb_y = mb_y;
    h->mb.i_mb_xy = mb_y * h->mb.i_mb_stride + mb_x;
    h->mb.i_b8_xy = 2*(mb_y * h->mb.i_b8_stride + mb_x);
    h->mb.i_b4_xy = 4*(mb_y * h->mb.i_b4_stride + mb_x);
    h->mb.left_b8[0] =
    h->mb.left_b8[1] = -1;
    h->mb.left_b4[0] =
    h->mb.left_b4[1] = -1;
    h->mb.i_neighbour = 0;
    h->mb.i_neighbour_intra = 0;
    h->mb.i_neighbour_frame = 0;
    h->mb.i_mb_top_xy = -1;
    h->mb.i_mb_top_y = -1;
    h->mb.i_mb_left_xy[0] = h->mb.i_mb_left_xy[1] = -1;
    h->mb.i_mb_topleft_xy = -1;
    h->mb.i_mb_topright_xy = -1;
    h->mb.i_mb_type_top = -1;
    h->mb.i_mb_type_left[0] = h->mb.i_mb_type_left[1] = -1;
    h->mb.i_mb_type_topleft = -1;
    h->mb.i_mb_type_topright = -1;
    h->mb.left_index_table = &left_indices[3];
    h->mb.topleft_partition = 0;

    int topleft_y = top_y;
    int topright_y = top_y;
    int left[2];

    left[0] = left[1] = h->mb.i_mb_xy - 1;
    h->mb.left_b8[0] = h->mb.left_b8[1] = h->mb.i_b8_xy - 2;
    h->mb.left_b4[0] = h->mb.left_b4[1] = h->mb.i_b4_xy - 4;

    if( b_interlaced )
    {
        h->mb.i_mb_top_mbpair_xy = h->mb.i_mb_xy - 2*h->mb.i_mb_stride;
        h->mb.i_mb_topleft_y = -1;
        h->mb.i_mb_topright_y = -1;

        if( mb_y&1 )
        {
            if( mb_x && mb_interlaced != h->mb.field[h->mb.i_mb_xy-1] )
            {
                left[0] = left[1] = h->mb.i_mb_xy - 1 - h->mb.i_mb_stride;
                h->mb.left_b8[0] = h->mb.left_b8[1] = h->mb.i_b8_xy - 2 - 2*h->mb.i_b8_stride;
                h->mb.left_b4[0] = h->mb.left_b4[1] = h->mb.i_b4_xy - 4 - 4*h->mb.i_b4_stride;

                if( mb_interlaced )
                {
                    h->mb.left_index_table = &left_indices[2];
                    left[1] += h->mb.i_mb_stride;
                    h->mb.left_b8[1] += 2*h->mb.i_b8_stride;
                    h->mb.left_b4[1] += 4*h->mb.i_b4_stride;
                }
                else
                {
                    h->mb.left_index_table = &left_indices[1];
                    topleft_y++;
                    h->mb.topleft_partition = 1;
                }
            }
            if( !mb_interlaced )
                topright_y = -1;
        }
        else
        {
            if( mb_interlaced && top >= 0 )
            {
                if( !h->mb.field[top] )
                {
                    top += h->mb.i_mb_stride;
                    top_y++;
                }
                if( mb_x )
                    topleft_y += !h->mb.field[h->mb.i_mb_stride*topleft_y + mb_x - 1];
                if( mb_x < h->mb.i_mb_width-1 )
                    topright_y += !h->mb.field[h->mb.i_mb_stride*topright_y + mb_x + 1];
            }
            if( mb_x && mb_interlaced != h->mb.field[h->mb.i_mb_xy-1] )
            {
                if( mb_interlaced )
                {
                    h->mb.left_index_table = &left_indices[2];
                    left[1] += h->mb.i_mb_stride;
                    h->mb.left_b8[1] += 2*h->mb.i_b8_stride;
                    h->mb.left_b4[1] += 4*h->mb.i_b4_stride;
                }
                else
                    h->mb.left_index_table = &left_indices[0];
            }
        }
    }

    if( mb_x > 0 )
    {
        h->mb.i_neighbour_frame |= MB_LEFT;
        h->mb.i_mb_left_xy[0] = left[0];
        h->mb.i_mb_left_xy[1] = left[1];
        h->mb.i_mb_type_left[0] = h->mb.type[h->mb.i_mb_left_xy[0]];
        h->mb.i_mb_type_left[1] = h->mb.type[h->mb.i_mb_left_xy[1]];
        if( h->mb.slice_table[left[0]] == h->sh.i_first_mb )
        {
            h->mb.i_neighbour |= MB_LEFT;

            // FIXME: We don't currently support constrained intra + mbaff.
            if( !h->param.b_constrained_intra || IS_INTRA( h->mb.i_mb_type_left[0] ) )
                h->mb.i_neighbour_intra |= MB_LEFT;
        }
    }

    /* We can't predict from the previous threadslice since it hasn't been encoded yet. */
    if( (h->i_threadslice_start >> mb_interlaced) != (mb_y >> mb_interlaced) )
    {
        if( top >= 0 )
        {
            h->mb.i_neighbour_frame |= MB_TOP;
            h->mb.i_mb_top_xy = top;
            h->mb.i_mb_top_y = top_y;
            h->mb.i_mb_type_top = h->mb.type[h->mb.i_mb_top_xy];
            if( h->mb.slice_table[top] == h->sh.i_first_mb )
            {
                h->mb.i_neighbour |= MB_TOP;

                if( !h->param.b_constrained_intra || IS_INTRA( h->mb.i_mb_type_top ) )
                    h->mb.i_neighbour_intra |= MB_TOP;

                /* We only need to prefetch the top blocks because the left was just written
                 * to as part of the previous cache_save.  Since most target CPUs use write-allocate
                 * caches, left blocks are near-guaranteed to be in L1 cache.  Top--not so much. */
                x264_prefetch( &h->mb.cbp[top] );
                x264_prefetch( h->mb.intra4x4_pred_mode[top] );
                x264_prefetch( &h->mb.non_zero_count[top][12] );
                /* These aren't always allocated, but prefetching an invalid address can't hurt. */
                x264_prefetch( &h->mb.mb_transform_size[top] );
                x264_prefetch( &h->mb.skipbp[top] );
            }
        }

        if( mb_x > 0 && topleft_y >= 0  )
        {
            h->mb.i_neighbour_frame |= MB_TOPLEFT;
            h->mb.i_mb_topleft_xy = h->mb.i_mb_stride*topleft_y + mb_x - 1;
            h->mb.i_mb_topleft_y = topleft_y;
            h->mb.i_mb_type_topleft = h->mb.type[h->mb.i_mb_topleft_xy];
            if( h->mb.slice_table[h->mb.i_mb_topleft_xy] == h->sh.i_first_mb )
            {
                h->mb.i_neighbour |= MB_TOPLEFT;

                if( !h->param.b_constrained_intra || IS_INTRA( h->mb.i_mb_type_topleft ) )
                    h->mb.i_neighbour_intra |= MB_TOPLEFT;
            }
        }

        if( mb_x < h->mb.i_mb_width - 1 && topright_y >= 0 )
        {
            h->mb.i_neighbour_frame |= MB_TOPRIGHT;
            h->mb.i_mb_topright_xy = h->mb.i_mb_stride*topright_y + mb_x + 1;
            h->mb.i_mb_topright_y = topright_y;
            h->mb.i_mb_type_topright = h->mb.type[h->mb.i_mb_topright_xy];
            if( h->mb.slice_table[h->mb.i_mb_topright_xy] == h->sh.i_first_mb )
            {
                h->mb.i_neighbour |= MB_TOPRIGHT;

                if( !h->param.b_constrained_intra || IS_INTRA( h->mb.i_mb_type_topright ) )
                    h->mb.i_neighbour_intra |= MB_TOPRIGHT;
            }
        }
    }
}

#define LTOP 0
#if HAVE_INTERLACED
#   define LBOT 1
#else
#   define LBOT 0
#endif

static void ALWAYS_INLINE macroblock_cache_load( x264_t *h, int mb_x, int mb_y, int b_mbaff )
{
    macroblock_cache_load_neighbours( h, mb_x, mb_y, b_mbaff );

    int *left = h->mb.i_mb_left_xy;
    int top  = h->mb.i_mb_top_xy;
    int top_y = h->mb.i_mb_top_y;
    int s8x8 = h->mb.i_b8_stride;
    int s4x4 = h->mb.i_b4_stride;
    int top_8x8 = (2*top_y+1) * s8x8 + 2*mb_x;
    int top_4x4 = (4*top_y+3) * s4x4 + 4*mb_x;
    int lists = (1 << h->sh.i_type) & 3;

    /* GCC pessimizes direct loads from heap-allocated arrays due to aliasing. */
    /* By only dereferencing them once, we avoid this issue. */
    int8_t (*i4x4)[8] = h->mb.intra4x4_pred_mode;
    uint8_t (*nnz)[48] = h->mb.non_zero_count;
    int16_t *cbp = h->mb.cbp;

    const x264_left_table_t *left_index_table = h->mb.left_index_table;

    h->mb.cache.deblock_strength = h->deblock_strength[mb_y&1][h->param.b_sliced_threads?h->mb.i_mb_xy:mb_x];

    /* load cache */
    if( h->mb.i_neighbour & MB_TOP )
    {
        h->mb.cache.i_cbp_top = cbp[top];
        /* load intra4x4 */
        CP32( &h->mb.cache.intra4x4_pred_mode[x264_scan8[0] - 8], &i4x4[top][0] );

        /* load non_zero_count */
        CP32( &h->mb.cache.non_zero_count[x264_scan8[ 0] - 8], &nnz[top][12] );
        CP32( &h->mb.cache.non_zero_count[x264_scan8[16] - 8], &nnz[top][16-4 + (16>>CHROMA_V_SHIFT)] );
        CP32( &h->mb.cache.non_zero_count[x264_scan8[32] - 8], &nnz[top][32-4 + (16>>CHROMA_V_SHIFT)] );

        /* Finish the prefetching */
        for( int l = 0; l < lists; l++ )
        {
            x264_prefetch( &h->mb.mv[l][top_4x4-1] );
            /* Top right being not in the same cacheline as top left will happen
             * once every 4 MBs, so one extra prefetch is worthwhile */
            x264_prefetch( &h->mb.mv[l][top_4x4+4] );
            x264_prefetch( &h->mb.ref[l][top_8x8-1] );
            x264_prefetch( &h->mb.mvd[l][top] );
        }
    }
    else
    {
        h->mb.cache.i_cbp_top = -1;

        /* load intra4x4 */
        M32( &h->mb.cache.intra4x4_pred_mode[x264_scan8[0] - 8] ) = 0xFFFFFFFFU;

        /* load non_zero_count */
        M32( &h->mb.cache.non_zero_count[x264_scan8[ 0] - 8] ) = 0x80808080U;
        M32( &h->mb.cache.non_zero_count[x264_scan8[16] - 8] ) = 0x80808080U;
        M32( &h->mb.cache.non_zero_count[x264_scan8[32] - 8] ) = 0x80808080U;
    }

    if( h->mb.i_neighbour & MB_LEFT )
    {
        int ltop = left[LTOP];
        int lbot = b_mbaff ? left[LBOT] : ltop;
        if( b_mbaff )
        {
            const int16_t top_luma = (cbp[ltop] >> (left_index_table->mv[0]&(~1))) & 2;
            const int16_t bot_luma = (cbp[lbot] >> (left_index_table->mv[2]&(~1))) & 2;
            h->mb.cache.i_cbp_left = (cbp[ltop] & 0xfff0) | (bot_luma<<2) | top_luma;
        }
        else
            h->mb.cache.i_cbp_left = cbp[ltop];

        /* load intra4x4 */
        h->mb.cache.intra4x4_pred_mode[x264_scan8[ 0] - 1] = i4x4[ltop][left_index_table->intra[0]];
        h->mb.cache.intra4x4_pred_mode[x264_scan8[ 2] - 1] = i4x4[ltop][left_index_table->intra[1]];
        h->mb.cache.intra4x4_pred_mode[x264_scan8[ 8] - 1] = i4x4[lbot][left_index_table->intra[2]];
        h->mb.cache.intra4x4_pred_mode[x264_scan8[10] - 1] = i4x4[lbot][left_index_table->intra[3]];

        /* load non_zero_count */
        h->mb.cache.non_zero_count[x264_scan8[ 0] - 1] = nnz[ltop][left_index_table->nnz[0]];
        h->mb.cache.non_zero_count[x264_scan8[ 2] - 1] = nnz[ltop][left_index_table->nnz[1]];
        h->mb.cache.non_zero_count[x264_scan8[ 8] - 1] = nnz[lbot][left_index_table->nnz[2]];
        h->mb.cache.non_zero_count[x264_scan8[10] - 1] = nnz[lbot][left_index_table->nnz[3]];

        if( CHROMA_FORMAT >= CHROMA_422 )
        {
            int offset = (4>>CHROMA_H_SHIFT) - 4;
            h->mb.cache.non_zero_count[x264_scan8[16+ 0] - 1] = nnz[ltop][left_index_table->nnz[0]+16+offset];
            h->mb.cache.non_zero_count[x264_scan8[16+ 2] - 1] = nnz[ltop][left_index_table->nnz[1]+16+offset];
            h->mb.cache.non_zero_count[x264_scan8[16+ 8] - 1] = nnz[lbot][left_index_table->nnz[2]+16+offset];
            h->mb.cache.non_zero_count[x264_scan8[16+10] - 1] = nnz[lbot][left_index_table->nnz[3]+16+offset];
            h->mb.cache.non_zero_count[x264_scan8[32+ 0] - 1] = nnz[ltop][left_index_table->nnz[0]+32+offset];
            h->mb.cache.non_zero_count[x264_scan8[32+ 2] - 1] = nnz[ltop][left_index_table->nnz[1]+32+offset];
            h->mb.cache.non_zero_count[x264_scan8[32+ 8] - 1] = nnz[lbot][left_index_table->nnz[2]+32+offset];
            h->mb.cache.non_zero_count[x264_scan8[32+10] - 1] = nnz[lbot][left_index_table->nnz[3]+32+offset];
        }
        else
        {
            h->mb.cache.non_zero_count[x264_scan8[16+ 0] - 1] = nnz[ltop][left_index_table->nnz_chroma[0]];
            h->mb.cache.non_zero_count[x264_scan8[16+ 2] - 1] = nnz[lbot][left_index_table->nnz_chroma[1]];
            h->mb.cache.non_zero_count[x264_scan8[32+ 0] - 1] = nnz[ltop][left_index_table->nnz_chroma[2]];
            h->mb.cache.non_zero_count[x264_scan8[32+ 2] - 1] = nnz[lbot][left_index_table->nnz_chroma[3]];
        }
    }
    else
    {
        h->mb.cache.i_cbp_left = -1;

        h->mb.cache.intra4x4_pred_mode[x264_scan8[ 0] - 1] =
        h->mb.cache.intra4x4_pred_mode[x264_scan8[ 2] - 1] =
        h->mb.cache.intra4x4_pred_mode[x264_scan8[ 8] - 1] =
        h->mb.cache.intra4x4_pred_mode[x264_scan8[10] - 1] = -1;

        /* load non_zero_count */
        h->mb.cache.non_zero_count[x264_scan8[ 0] - 1] =
        h->mb.cache.non_zero_count[x264_scan8[ 2] - 1] =
        h->mb.cache.non_zero_count[x264_scan8[ 8] - 1] =
        h->mb.cache.non_zero_count[x264_scan8[10] - 1] =
        h->mb.cache.non_zero_count[x264_scan8[16+ 0] - 1] =
        h->mb.cache.non_zero_count[x264_scan8[16+ 2] - 1] =
        h->mb.cache.non_zero_count[x264_scan8[32+ 0] - 1] =
        h->mb.cache.non_zero_count[x264_scan8[32+ 2] - 1] = 0x80;
        if( CHROMA_FORMAT >= CHROMA_422 )
        {
            h->mb.cache.non_zero_count[x264_scan8[16+ 8] - 1] =
            h->mb.cache.non_zero_count[x264_scan8[16+10] - 1] =
            h->mb.cache.non_zero_count[x264_scan8[32+ 8] - 1] =
            h->mb.cache.non_zero_count[x264_scan8[32+10] - 1] = 0x80;
        }
    }

    if( h->pps->b_transform_8x8_mode )
    {
        h->mb.cache.i_neighbour_transform_size =
            ( (h->mb.i_neighbour & MB_LEFT) && h->mb.mb_transform_size[left[0]] )
          + ( (h->mb.i_neighbour & MB_TOP) && h->mb.mb_transform_size[top]  );
    }

    if( b_mbaff )
    {
        h->mb.pic.i_fref[0] = h->i_ref[0] << MB_INTERLACED;
        h->mb.pic.i_fref[1] = h->i_ref[1] << MB_INTERLACED;
    }

    if( !b_mbaff )
    {
        x264_copy_column8( h->mb.pic.p_fdec[0]-1+ 4*FDEC_STRIDE, h->mb.pic.p_fdec[0]+15+ 4*FDEC_STRIDE );
        x264_copy_column8( h->mb.pic.p_fdec[0]-1+12*FDEC_STRIDE, h->mb.pic.p_fdec[0]+15+12*FDEC_STRIDE );
        macroblock_load_pic_pointers( h, mb_x, mb_y, 0, 0, 0 );
        if( CHROMA444 )
        {
            x264_copy_column8( h->mb.pic.p_fdec[1]-1+ 4*FDEC_STRIDE, h->mb.pic.p_fdec[1]+15+ 4*FDEC_STRIDE );
            x264_copy_column8( h->mb.pic.p_fdec[1]-1+12*FDEC_STRIDE, h->mb.pic.p_fdec[1]+15+12*FDEC_STRIDE );
            x264_copy_column8( h->mb.pic.p_fdec[2]-1+ 4*FDEC_STRIDE, h->mb.pic.p_fdec[2]+15+ 4*FDEC_STRIDE );
            x264_copy_column8( h->mb.pic.p_fdec[2]-1+12*FDEC_STRIDE, h->mb.pic.p_fdec[2]+15+12*FDEC_STRIDE );
            macroblock_load_pic_pointers( h, mb_x, mb_y, 1, 0, 0 );
            macroblock_load_pic_pointers( h, mb_x, mb_y, 2, 0, 0 );
        }
        else
        {
            x264_copy_column8( h->mb.pic.p_fdec[1]-1+ 4*FDEC_STRIDE, h->mb.pic.p_fdec[1]+ 7+ 4*FDEC_STRIDE );
            x264_copy_column8( h->mb.pic.p_fdec[2]-1+ 4*FDEC_STRIDE, h->mb.pic.p_fdec[2]+ 7+ 4*FDEC_STRIDE );
            if( CHROMA_FORMAT == CHROMA_422 )
            {
                x264_copy_column8( h->mb.pic.p_fdec[1]-1+12*FDEC_STRIDE, h->mb.pic.p_fdec[1]+ 7+12*FDEC_STRIDE );
                x264_copy_column8( h->mb.pic.p_fdec[2]-1+12*FDEC_STRIDE, h->mb.pic.p_fdec[2]+ 7+12*FDEC_STRIDE );
            }
            macroblock_load_pic_pointers( h, mb_x, mb_y, 1, 1, 0 );
        }
    }
    else
    {
        macroblock_load_pic_pointers( h, mb_x, mb_y, 0, 0, 1 );
        if( CHROMA444 )
        {
            macroblock_load_pic_pointers( h, mb_x, mb_y, 1, 0, 1 );
            macroblock_load_pic_pointers( h, mb_x, mb_y, 2, 0, 1 );
        }
        else
            macroblock_load_pic_pointers( h, mb_x, mb_y, 1, 1, 1 );
    }

    if( h->fdec->integral )
    {
        int offset = 16 * (mb_x + mb_y * h->fdec->i_stride[0]);
        for( int list = 0; list < 2; list++ )
            for( int i = 0; i < h->mb.pic.i_fref[list]; i++ )
                h->mb.pic.p_integral[list][i] = &h->fref[list][i]->integral[offset];
    }

    x264_prefetch_fenc( h, h->fenc, mb_x, mb_y );

    /* load ref/mv/mvd */
    for( int l = 0; l < lists; l++ )
    {
        int16_t (*mv)[2] = h->mb.mv[l];
        int8_t *ref = h->mb.ref[l];

        int i8 = x264_scan8[0] - 1 - 1*8;
        if( h->mb.i_neighbour & MB_TOPLEFT )
        {
            int ir = b_mbaff ? 2*(s8x8*h->mb.i_mb_topleft_y + mb_x-1)+1+s8x8 : top_8x8 - 1;
            int iv = b_mbaff ? 4*(s4x4*h->mb.i_mb_topleft_y + mb_x-1)+3+3*s4x4 : top_4x4 - 1;
            if( b_mbaff && h->mb.topleft_partition )
            {
                /* Take motion vector from the middle of macroblock instead of
                 * the bottom right as usual. */
                iv -= 2*s4x4;
                ir -= s8x8;
            }
            h->mb.cache.ref[l][i8] = ref[ir];
            CP32( h->mb.cache.mv[l][i8], mv[iv] );
        }
        else
        {
            h->mb.cache.ref[l][i8] = -2;
            M32( h->mb.cache.mv[l][i8] ) = 0;
        }

        i8 = x264_scan8[0] - 8;
        if( h->mb.i_neighbour & MB_TOP )
        {
            h->mb.cache.ref[l][i8+0] =
            h->mb.cache.ref[l][i8+1] = ref[top_8x8 + 0];
            h->mb.cache.ref[l][i8+2] =
            h->mb.cache.ref[l][i8+3] = ref[top_8x8 + 1];
            CP128( h->mb.cache.mv[l][i8], mv[top_4x4] );
        }
        else
        {
            M128( h->mb.cache.mv[l][i8] ) = M128_ZERO;
            M32( &h->mb.cache.ref[l][i8] ) = (uint8_t)(-2) * 0x01010101U;
        }

        i8 = x264_scan8[0] + 4 - 1*8;
        if( h->mb.i_neighbour & MB_TOPRIGHT )
        {
            int ir = b_mbaff ? 2*(s8x8*h->mb.i_mb_topright_y + (mb_x+1))+s8x8 : top_8x8 + 2;
            int iv = b_mbaff ? 4*(s4x4*h->mb.i_mb_topright_y + (mb_x+1))+3*s4x4 : top_4x4 + 4;
            h->mb.cache.ref[l][i8] = ref[ir];
            CP32( h->mb.cache.mv[l][i8], mv[iv] );
        }
        else
             h->mb.cache.ref[l][i8] = -2;

        i8 = x264_scan8[0] - 1;
        if( h->mb.i_neighbour & MB_LEFT )
        {
            if( b_mbaff )
            {
                h->mb.cache.ref[l][i8+0*8] = ref[h->mb.left_b8[LTOP] + 1 + s8x8*left_index_table->ref[0]];
                h->mb.cache.ref[l][i8+1*8] = ref[h->mb.left_b8[LTOP] + 1 + s8x8*left_index_table->ref[1]];
                h->mb.cache.ref[l][i8+2*8] = ref[h->mb.left_b8[LBOT] + 1 + s8x8*left_index_table->ref[2]];
                h->mb.cache.ref[l][i8+3*8] = ref[h->mb.left_b8[LBOT] + 1 + s8x8*left_index_table->ref[3]];

                CP32( h->mb.cache.mv[l][i8+0*8], mv[h->mb.left_b4[LTOP] + 3 + s4x4*left_index_table->mv[0]] );
                CP32( h->mb.cache.mv[l][i8+1*8], mv[h->mb.left_b4[LTOP] + 3 + s4x4*left_index_table->mv[1]] );
                CP32( h->mb.cache.mv[l][i8+2*8], mv[h->mb.left_b4[LBOT] + 3 + s4x4*left_index_table->mv[2]] );
                CP32( h->mb.cache.mv[l][i8+3*8], mv[h->mb.left_b4[LBOT] + 3 + s4x4*left_index_table->mv[3]] );
            }
            else
            {
                const int ir = h->mb.i_b8_xy - 1;
                const int iv = h->mb.i_b4_xy - 1;
                h->mb.cache.ref[l][i8+0*8] =
                h->mb.cache.ref[l][i8+1*8] = ref[ir + 0*s8x8];
                h->mb.cache.ref[l][i8+2*8] =
                h->mb.cache.ref[l][i8+3*8] = ref[ir + 1*s8x8];

                CP32( h->mb.cache.mv[l][i8+0*8], mv[iv + 0*s4x4] );
                CP32( h->mb.cache.mv[l][i8+1*8], mv[iv + 1*s4x4] );
                CP32( h->mb.cache.mv[l][i8+2*8], mv[iv + 2*s4x4] );
                CP32( h->mb.cache.mv[l][i8+3*8], mv[iv + 3*s4x4] );
            }
        }
        else
        {
            for( int i = 0; i < 4; i++ )
            {
                h->mb.cache.ref[l][i8+i*8] = -2;
                M32( h->mb.cache.mv[l][i8+i*8] ) = 0;
            }
        }

        /* Extra logic for top right mv in mbaff.
         * . . . d  . . a .
         * . . . e  . . . .
         * . . . f  b . c .
         * . . . .  . . . .
         *
         * If the top right of the 4x4 partitions labeled a, b and c in the
         * above diagram do not exist, but the entries d, e and f exist (in
         * the macroblock to the left) then use those instead.
         */
        if( b_mbaff && (h->mb.i_neighbour & MB_LEFT) )
        {
            if( MB_INTERLACED && !h->mb.field[h->mb.i_mb_xy-1] )
            {
                h->mb.cache.topright_ref[l][0] = ref[h->mb.left_b8[0] + 1 + s8x8*0];
                h->mb.cache.topright_ref[l][1] = ref[h->mb.left_b8[0] + 1 + s8x8*1];
                h->mb.cache.topright_ref[l][2] = ref[h->mb.left_b8[1] + 1 + s8x8*0];
                CP32( h->mb.cache.topright_mv[l][0], mv[h->mb.left_b4[0] + 3 + s4x4*(left_index_table->mv[0]+1)] );
                CP32( h->mb.cache.topright_mv[l][1], mv[h->mb.left_b4[0] + 3 + s4x4*(left_index_table->mv[1]+1)] );
                CP32( h->mb.cache.topright_mv[l][2], mv[h->mb.left_b4[1] + 3 + s4x4*(left_index_table->mv[2]+1)] );
            }
            else if( !MB_INTERLACED && h->mb.field[h->mb.i_mb_xy-1] )
            {
                // Looking at the bottom field so always take the bottom macroblock of the pair.
                h->mb.cache.topright_ref[l][0] = ref[h->mb.left_b8[0] + 1 + s8x8*2 + s8x8*left_index_table->ref[0]];
                h->mb.cache.topright_ref[l][1] = ref[h->mb.left_b8[0] + 1 + s8x8*2 + s8x8*left_index_table->ref[1]];
                h->mb.cache.topright_ref[l][2] = ref[h->mb.left_b8[0] + 1 + s8x8*2 + s8x8*left_index_table->ref[2]];
                CP32( h->mb.cache.topright_mv[l][0], mv[h->mb.left_b4[0] + 3 + s4x4*4 + s4x4*left_index_table->mv[0]] );
                CP32( h->mb.cache.topright_mv[l][1], mv[h->mb.left_b4[0] + 3 + s4x4*4 + s4x4*left_index_table->mv[1]] );
                CP32( h->mb.cache.topright_mv[l][2], mv[h->mb.left_b4[0] + 3 + s4x4*4 + s4x4*left_index_table->mv[2]] );
            }
        }

        if( h->param.b_cabac )
        {
            uint8_t (*mvd)[8][2] = h->mb.mvd[l];
            if( h->mb.i_neighbour & MB_TOP )
                CP64( h->mb.cache.mvd[l][x264_scan8[0] - 8], mvd[top][0] );
            else
                M64( h->mb.cache.mvd[l][x264_scan8[0] - 8] ) = 0;

            if( h->mb.i_neighbour & MB_LEFT && (!b_mbaff || h->mb.cache.ref[l][x264_scan8[0]-1] >= 0) )
            {
                CP16( h->mb.cache.mvd[l][x264_scan8[0 ] - 1], mvd[left[LTOP]][left_index_table->intra[0]] );
                CP16( h->mb.cache.mvd[l][x264_scan8[2 ] - 1], mvd[left[LTOP]][left_index_table->intra[1]] );
            }
            else
            {
                M16( h->mb.cache.mvd[l][x264_scan8[0]-1+0*8] ) = 0;
                M16( h->mb.cache.mvd[l][x264_scan8[0]-1+1*8] ) = 0;
            }
            if( h->mb.i_neighbour & MB_LEFT && (!b_mbaff || h->mb.cache.ref[l][x264_scan8[0]-1+2*8] >= 0) )
            {
                CP16( h->mb.cache.mvd[l][x264_scan8[8 ] - 1], mvd[left[LBOT]][left_index_table->intra[2]] );
                CP16( h->mb.cache.mvd[l][x264_scan8[10] - 1], mvd[left[LBOT]][left_index_table->intra[3]] );
            }
            else
            {
                M16( h->mb.cache.mvd[l][x264_scan8[0]-1+2*8] ) = 0;
                M16( h->mb.cache.mvd[l][x264_scan8[0]-1+3*8] ) = 0;
            }
        }

        /* If motion vectors are cached from frame macroblocks but this
         * macroblock is a field macroblock then the motion vector must be
         * halved. Similarly, motion vectors from field macroblocks are doubled. */
        if( b_mbaff )
        {
#define MAP_MVS\
                if( FIELD_DIFFERENT(h->mb.i_mb_topleft_xy) )\
                    MAP_F2F(mv, ref, x264_scan8[0] - 1 - 1*8)\
                if( FIELD_DIFFERENT(top) )\
                {\
                    MAP_F2F(mv, ref, x264_scan8[0] + 0 - 1*8)\
                    MAP_F2F(mv, ref, x264_scan8[0] + 1 - 1*8)\
                    MAP_F2F(mv, ref, x264_scan8[0] + 2 - 1*8)\
                    MAP_F2F(mv, ref, x264_scan8[0] + 3 - 1*8)\
                }\
                if( FIELD_DIFFERENT(h->mb.i_mb_topright_xy) )\
                    MAP_F2F(mv, ref, x264_scan8[0] + 4 - 1*8)\
                if( FIELD_DIFFERENT(left[0]) )\
                {\
                    MAP_F2F(mv, ref, x264_scan8[0] - 1 + 0*8)\
                    MAP_F2F(mv, ref, x264_scan8[0] - 1 + 1*8)\
                    MAP_F2F(mv, ref, x264_scan8[0] - 1 + 2*8)\
                    MAP_F2F(mv, ref, x264_scan8[0] - 1 + 3*8)\
                    MAP_F2F(topright_mv, topright_ref, 0)\
                    MAP_F2F(topright_mv, topright_ref, 1)\
                    MAP_F2F(topright_mv, topright_ref, 2)\
                }

            if( MB_INTERLACED )
            {
#define FIELD_DIFFERENT(macroblock) (macroblock >= 0 && !h->mb.field[macroblock])
#define MAP_F2F(varmv, varref, index)\
                if( h->mb.cache.varref[l][index] >= 0 )\
                {\
                    h->mb.cache.varref[l][index] <<= 1;\
                    h->mb.cache.varmv[l][index][1] /= 2;\
                    h->mb.cache.mvd[l][index][1] >>= 1;\
                }
                MAP_MVS
#undef MAP_F2F
#undef FIELD_DIFFERENT
            }
            else
            {
#define FIELD_DIFFERENT(macroblock) (macroblock >= 0 && h->mb.field[macroblock])
#define MAP_F2F(varmv, varref, index)\
                if( h->mb.cache.varref[l][index] >= 0 )\
                {\
                    h->mb.cache.varref[l][index] >>= 1;\
                    h->mb.cache.varmv[l][index][1] <<= 1;\
                    h->mb.cache.mvd[l][index][1] <<= 1;\
                }
                MAP_MVS
#undef MAP_F2F
#undef FIELD_DIFFERENT
            }
        }
    }

    if( b_mbaff && mb_x == 0 && !(mb_y&1) )
    {
        if( h->mb.i_mb_top_xy >= h->sh.i_first_mb )
            h->mb.field_decoding_flag = h->mb.field[h->mb.i_mb_top_xy];
        else
            h->mb.field_decoding_flag = 0;
    }

    /* Check whether skip here would cause decoder to predict interlace mode incorrectly.
     * FIXME: It might be better to change the interlace type rather than forcing a skip to be non-skip. */
    h->mb.b_allow_skip = 1;
    if( b_mbaff )
    {
        if( MB_INTERLACED != h->mb.field_decoding_flag &&
            (mb_y&1) && IS_SKIP(h->mb.type[h->mb.i_mb_xy - h->mb.i_mb_stride]) )
            h->mb.b_allow_skip = 0;
    }

    if( h->param.b_cabac )
    {
        if( b_mbaff )
        {
            int left_xy, top_xy;
            /* Neighbours here are calculated based on field_decoding_flag */
            int mb_xy = mb_x + (mb_y&~1)*h->mb.i_mb_stride;
            left_xy = mb_xy - 1;
            if( (mb_y&1) && mb_x > 0 && h->mb.field_decoding_flag == h->mb.field[left_xy] )
                left_xy += h->mb.i_mb_stride;
            if( h->mb.field_decoding_flag )
            {
                top_xy = mb_xy - h->mb.i_mb_stride;
                if( !(mb_y&1) && top_xy >= 0 && h->mb.slice_table[top_xy] == h->sh.i_first_mb && h->mb.field[top_xy] )
                    top_xy -= h->mb.i_mb_stride;
            }
            else
                top_xy = mb_x + (mb_y-1)*h->mb.i_mb_stride;

            h->mb.cache.i_neighbour_skip =   (mb_x >  0 && h->mb.slice_table[left_xy] == h->sh.i_first_mb && !IS_SKIP( h->mb.type[left_xy] ))
                                         + (top_xy >= 0 && h->mb.slice_table[top_xy]  == h->sh.i_first_mb && !IS_SKIP( h->mb.type[top_xy] ));
        }
        else
        {
            h->mb.cache.i_neighbour_skip = ((h->mb.i_neighbour & MB_LEFT) && !IS_SKIP( h->mb.i_mb_type_left[0] ))
                                         + ((h->mb.i_neighbour & MB_TOP)  && !IS_SKIP( h->mb.i_mb_type_top ));
        }
    }

    /* load skip */
    if( h->sh.i_type == SLICE_TYPE_B )
    {
        h->mb.bipred_weight = h->mb.bipred_weight_buf[MB_INTERLACED][MB_INTERLACED&(mb_y&1)];
        h->mb.dist_scale_factor = h->mb.dist_scale_factor_buf[MB_INTERLACED][MB_INTERLACED&(mb_y&1)];
        if( h->param.b_cabac )
        {
            uint8_t skipbp;
            x264_macroblock_cache_skip( h, 0, 0, 4, 4, 0 );
            if( b_mbaff )
            {
                skipbp = (h->mb.i_neighbour & MB_LEFT) ? h->mb.skipbp[left[LTOP]] : 0;
                h->mb.cache.skip[x264_scan8[0] - 1] = (skipbp >> (1+(left_index_table->mv[0]&~1))) & 1;
                skipbp = (h->mb.i_neighbour & MB_LEFT) ? h->mb.skipbp[left[LBOT]] : 0;
                h->mb.cache.skip[x264_scan8[8] - 1] = (skipbp >> (1+(left_index_table->mv[2]&~1))) & 1;
            }
            else
            {
                skipbp = (h->mb.i_neighbour & MB_LEFT) ? h->mb.skipbp[left[0]] : 0;
                h->mb.cache.skip[x264_scan8[0] - 1] = skipbp & 0x2;
                h->mb.cache.skip[x264_scan8[8] - 1] = skipbp & 0x8;
            }
            skipbp = (h->mb.i_neighbour & MB_TOP) ? h->mb.skipbp[top] : 0;
            h->mb.cache.skip[x264_scan8[0] - 8] = skipbp & 0x4;
            h->mb.cache.skip[x264_scan8[4] - 8] = skipbp & 0x8;
        }
    }

    if( h->sh.i_type == SLICE_TYPE_P )
        x264_mb_predict_mv_pskip( h, h->mb.cache.pskip_mv );

    h->mb.i_neighbour4[0] =
    h->mb.i_neighbour8[0] = (h->mb.i_neighbour_intra & (MB_TOP|MB_LEFT|MB_TOPLEFT))
                            | ((h->mb.i_neighbour_intra & MB_TOP) ? MB_TOPRIGHT : 0);
    h->mb.i_neighbour4[4] =
    h->mb.i_neighbour4[1] = MB_LEFT | ((h->mb.i_neighbour_intra & MB_TOP) ? (MB_TOP|MB_TOPLEFT|MB_TOPRIGHT) : 0);
    h->mb.i_neighbour4[2] =
    h->mb.i_neighbour4[8] =
    h->mb.i_neighbour4[10] =
    h->mb.i_neighbour8[2] = MB_TOP|MB_TOPRIGHT | ((h->mb.i_neighbour_intra & MB_LEFT) ? (MB_LEFT|MB_TOPLEFT) : 0);
    h->mb.i_neighbour4[5] =
    h->mb.i_neighbour8[1] = MB_LEFT | (h->mb.i_neighbour_intra & MB_TOPRIGHT)
                            | ((h->mb.i_neighbour_intra & MB_TOP) ? MB_TOP|MB_TOPLEFT : 0);
}

void x264_macroblock_cache_load_progressive( x264_t *h, int mb_x, int mb_y )
{
    macroblock_cache_load( h, mb_x, mb_y, 0 );
}

void x264_macroblock_cache_load_interlaced( x264_t *h, int mb_x, int mb_y )
{
    macroblock_cache_load( h, mb_x, mb_y, 1 );
}

static void macroblock_deblock_strength_mbaff( x264_t *h, uint8_t (*bs)[8][4] )
{
    if( (h->mb.i_neighbour & MB_LEFT) && h->mb.field[h->mb.i_mb_left_xy[0]] != MB_INTERLACED )
    {
        static const uint8_t offset[2][2][8] =
        {   {   { 0, 0, 0, 0, 1, 1, 1, 1 },
                { 2, 2, 2, 2, 3, 3, 3, 3 }, },
            {   { 0, 1, 2, 3, 0, 1, 2, 3 },
                { 0, 1, 2, 3, 0, 1, 2, 3 }, }
        };
        ALIGNED_ARRAY_8( uint8_t, tmpbs, [8] );

        const uint8_t *off = offset[MB_INTERLACED][h->mb.i_mb_y&1];
        uint8_t (*nnz)[48] = h->mb.non_zero_count;

        for( int i = 0; i < 8; i++ )
        {
            int left = h->mb.i_mb_left_xy[MB_INTERLACED ? i>>2 : i&1];
            int nnz_this = h->mb.cache.non_zero_count[x264_scan8[0]+8*(i>>1)];
            int nnz_left = nnz[left][3 + 4*off[i]];
            if( !h->param.b_cabac && h->pps->b_transform_8x8_mode )
            {
                int j = off[i]&~1;
                if( h->mb.mb_transform_size[left] )
                    nnz_left = !!(M16( &nnz[left][2+4*j] ) | M16( &nnz[left][2+4*(1+j)] ));
            }
            tmpbs[i] = (nnz_left || nnz_this) ? 2 : 1;
        }

        if( MB_INTERLACED )
        {
            CP32( bs[0][0], &tmpbs[0] );
            CP32( bs[0][4], &tmpbs[4] );
        }
        else
        {
            for( int i = 0; i < 4; i++ ) bs[0][0][i] = tmpbs[2*i];
            for( int i = 0; i < 4; i++ ) bs[0][4][i] = tmpbs[1+2*i];
        }
    }

    if( (h->mb.i_neighbour & MB_TOP) && MB_INTERLACED != h->mb.field[h->mb.i_mb_top_xy] )
    {
        if( !(h->mb.i_mb_y&1) && !MB_INTERLACED )
        {
            /* Need to filter both fields (even for frame macroblocks).
             * Filter top two rows using the top macroblock of the above
             * pair and then the bottom one. */
            int mbn_xy = h->mb.i_mb_xy - 2 * h->mb.i_mb_stride;
            uint8_t *nnz_cur = &h->mb.cache.non_zero_count[x264_scan8[0]];

            for( int j = 0; j < 2; j++, mbn_xy += h->mb.i_mb_stride )
            {
                uint8_t (*nnz)[48] = h->mb.non_zero_count;

                ALIGNED_4( uint8_t nnz_top[4] );
                CP32( nnz_top, &nnz[mbn_xy][3*4] );

                if( !h->param.b_cabac && h->pps->b_transform_8x8_mode && h->mb.mb_transform_size[mbn_xy] )
                {
                    nnz_top[0] = nnz_top[1] = M16( &nnz[mbn_xy][ 8] ) || M16( &nnz[mbn_xy][12] );
                    nnz_top[2] = nnz_top[3] = M16( &nnz[mbn_xy][10] ) || M16( &nnz[mbn_xy][14] );
                }

                for( int i = 0; i < 4; i++ )
                    bs[1][4*j][i] = (nnz_cur[i] || nnz_top[i]) ? 2 : 1;
            }
        }
        else
            for( int i = 0; i < 4; i++ )
                bs[1][0][i] = X264_MAX( bs[1][0][i], 1 );
    }
}

void x264_macroblock_deblock_strength( x264_t *h )
{
    uint8_t (*bs)[8][4] = h->mb.cache.deblock_strength;
    if( IS_INTRA( h->mb.i_type ) )
    {
        M32( bs[0][1] ) = 0x03030303;
        M64( bs[0][2] ) = 0x0303030303030303ULL;
        M32( bs[1][1] ) = 0x03030303;
        M64( bs[1][2] ) = 0x0303030303030303ULL;
        return;
    }

    /* Early termination: in this case, nnz guarantees all edges use strength 2.*/
    if( h->mb.b_transform_8x8 && !CHROMA444 )
    {
        int cbp_mask = 0xf >> CHROMA_V_SHIFT;
        if( (h->mb.i_cbp_luma&cbp_mask) == cbp_mask )
        {
            M32( bs[0][0] ) = 0x02020202;
            M32( bs[0][2] ) = 0x02020202;
            M32( bs[0][4] ) = 0x02020202;
            M64( bs[1][0] ) = 0x0202020202020202ULL; /* [1][1] and [1][3] has to be set for 4:2:2 */
            M64( bs[1][2] ) = 0x0202020202020202ULL;
            M32( bs[1][4] ) = 0x02020202;
            return;
        }
    }

    int neighbour_changed = 0;
    if( h->sh.i_disable_deblocking_filter_idc != 2 )
    {
        neighbour_changed = h->mb.i_neighbour_frame&~h->mb.i_neighbour;
        h->mb.i_neighbour = h->mb.i_neighbour_frame;
    }

    /* MBAFF deblock uses different left neighbors from encoding */
    if( SLICE_MBAFF && (h->mb.i_neighbour & MB_LEFT) && (h->mb.field[h->mb.i_mb_xy - 1] != MB_INTERLACED) )
    {
        h->mb.i_mb_left_xy[1] =
        h->mb.i_mb_left_xy[0] = h->mb.i_mb_xy - 1;
        if( h->mb.i_mb_y&1 )
            h->mb.i_mb_left_xy[0] -= h->mb.i_mb_stride;
        else
            h->mb.i_mb_left_xy[1] += h->mb.i_mb_stride;
    }

    /* If we have multiple slices and we're deblocking on slice edges, we
     * have to reload neighbour data. */
    if( neighbour_changed )
    {
        int top_y = h->mb.i_mb_top_y;
        int top_8x8 = (2*top_y+1) * h->mb.i_b8_stride + 2*h->mb.i_mb_x;
        int top_4x4 = (4*top_y+3) * h->mb.i_b4_stride + 4*h->mb.i_mb_x;
        int s8x8 = h->mb.i_b8_stride;
        int s4x4 = h->mb.i_b4_stride;

        uint8_t (*nnz)[48] = h->mb.non_zero_count;
        const x264_left_table_t *left_index_table = SLICE_MBAFF ? h->mb.left_index_table : &left_indices[3];

        if( neighbour_changed & MB_TOP )
            CP32( &h->mb.cache.non_zero_count[x264_scan8[0] - 8], &nnz[h->mb.i_mb_top_xy][12] );

        if( neighbour_changed & MB_LEFT )
        {
            int *left = h->mb.i_mb_left_xy;
            h->mb.cache.non_zero_count[x264_scan8[0 ] - 1] = nnz[left[0]][left_index_table->nnz[0]];
            h->mb.cache.non_zero_count[x264_scan8[2 ] - 1] = nnz[left[0]][left_index_table->nnz[1]];
            h->mb.cache.non_zero_count[x264_scan8[8 ] - 1] = nnz[left[1]][left_index_table->nnz[2]];
            h->mb.cache.non_zero_count[x264_scan8[10] - 1] = nnz[left[1]][left_index_table->nnz[3]];
        }

        for( int l = 0; l <= (h->sh.i_type == SLICE_TYPE_B); l++ )
        {
            int16_t (*mv)[2] = h->mb.mv[l];
            int8_t *ref = h->mb.ref[l];

            int i8 = x264_scan8[0] - 8;
            if( neighbour_changed & MB_TOP )
            {
                h->mb.cache.ref[l][i8+0] =
                h->mb.cache.ref[l][i8+1] = ref[top_8x8 + 0];
                h->mb.cache.ref[l][i8+2] =
                h->mb.cache.ref[l][i8+3] = ref[top_8x8 + 1];
                CP128( h->mb.cache.mv[l][i8], mv[top_4x4] );
            }

            i8 = x264_scan8[0] - 1;
            if( neighbour_changed & MB_LEFT )
            {
                h->mb.cache.ref[l][i8+0*8] =
                h->mb.cache.ref[l][i8+1*8] = ref[h->mb.left_b8[0] + 1 + s8x8*left_index_table->ref[0]];
                h->mb.cache.ref[l][i8+2*8] =
                h->mb.cache.ref[l][i8+3*8] = ref[h->mb.left_b8[1] + 1 + s8x8*left_index_table->ref[2]];

                CP32( h->mb.cache.mv[l][i8+0*8], mv[h->mb.left_b4[0] + 3 + s4x4*left_index_table->mv[0]] );
                CP32( h->mb.cache.mv[l][i8+1*8], mv[h->mb.left_b4[0] + 3 + s4x4*left_index_table->mv[1]] );
                CP32( h->mb.cache.mv[l][i8+2*8], mv[h->mb.left_b4[1] + 3 + s4x4*left_index_table->mv[2]] );
                CP32( h->mb.cache.mv[l][i8+3*8], mv[h->mb.left_b4[1] + 3 + s4x4*left_index_table->mv[3]] );
            }
        }
    }

    if( h->param.analyse.i_weighted_pred == X264_WEIGHTP_SMART && h->sh.i_type == SLICE_TYPE_P )
    {
        /* Handle reference frame duplicates */
        int i8 = x264_scan8[0] - 8;
        h->mb.cache.ref[0][i8+0] =
        h->mb.cache.ref[0][i8+1] = deblock_ref_table(h->mb.cache.ref[0][i8+0]);
        h->mb.cache.ref[0][i8+2] =
        h->mb.cache.ref[0][i8+3] = deblock_ref_table(h->mb.cache.ref[0][i8+2]);

        i8 = x264_scan8[0] - 1;
        h->mb.cache.ref[0][i8+0*8] =
        h->mb.cache.ref[0][i8+1*8] = deblock_ref_table(h->mb.cache.ref[0][i8+0*8]);
        h->mb.cache.ref[0][i8+2*8] =
        h->mb.cache.ref[0][i8+3*8] = deblock_ref_table(h->mb.cache.ref[0][i8+2*8]);

        int ref0 = deblock_ref_table(h->mb.cache.ref[0][x264_scan8[ 0]]);
        int ref1 = deblock_ref_table(h->mb.cache.ref[0][x264_scan8[ 4]]);
        int ref2 = deblock_ref_table(h->mb.cache.ref[0][x264_scan8[ 8]]);
        int ref3 = deblock_ref_table(h->mb.cache.ref[0][x264_scan8[12]]);
        uint32_t reftop = pack16to32( (uint8_t)ref0, (uint8_t)ref1 ) * 0x0101;
        uint32_t refbot = pack16to32( (uint8_t)ref2, (uint8_t)ref3 ) * 0x0101;

        M32( &h->mb.cache.ref[0][x264_scan8[0]+8*0] ) = reftop;
        M32( &h->mb.cache.ref[0][x264_scan8[0]+8*1] ) = reftop;
        M32( &h->mb.cache.ref[0][x264_scan8[0]+8*2] ) = refbot;
        M32( &h->mb.cache.ref[0][x264_scan8[0]+8*3] ) = refbot;
    }

    /* Munge NNZ for cavlc + 8x8dct */
    if( !h->param.b_cabac && h->pps->b_transform_8x8_mode )
    {
        uint8_t (*nnz)[48] = h->mb.non_zero_count;
        int top = h->mb.i_mb_top_xy;
        int *left = h->mb.i_mb_left_xy;

        if( (h->mb.i_neighbour & MB_TOP) && h->mb.mb_transform_size[top] )
        {
            int i8 = x264_scan8[0] - 8;
            int nnz_top0 = M16( &nnz[top][8] ) | M16( &nnz[top][12] );
            int nnz_top1 = M16( &nnz[top][10] ) | M16( &nnz[top][14] );
            M16( &h->mb.cache.non_zero_count[i8+0] ) = nnz_top0 ? 0x0101 : 0;
            M16( &h->mb.cache.non_zero_count[i8+2] ) = nnz_top1 ? 0x0101 : 0;
        }

        if( h->mb.i_neighbour & MB_LEFT )
        {
            int i8 = x264_scan8[0] - 1;
            if( h->mb.mb_transform_size[left[0]] )
            {
                int nnz_left0 = M16( &nnz[left[0]][2] ) | M16( &nnz[left[0]][6] );
                h->mb.cache.non_zero_count[i8+8*0] = !!nnz_left0;
                h->mb.cache.non_zero_count[i8+8*1] = !!nnz_left0;
            }
            if( h->mb.mb_transform_size[left[1]] )
            {
                int nnz_left1 = M16( &nnz[left[1]][10] ) | M16( &nnz[left[1]][14] );
                h->mb.cache.non_zero_count[i8+8*2] = !!nnz_left1;
                h->mb.cache.non_zero_count[i8+8*3] = !!nnz_left1;
            }
        }

        if( h->mb.b_transform_8x8 )
        {
            int nnz0 = M16( &h->mb.cache.non_zero_count[x264_scan8[ 0]] ) | M16( &h->mb.cache.non_zero_count[x264_scan8[ 2]] );
            int nnz1 = M16( &h->mb.cache.non_zero_count[x264_scan8[ 4]] ) | M16( &h->mb.cache.non_zero_count[x264_scan8[ 6]] );
            int nnz2 = M16( &h->mb.cache.non_zero_count[x264_scan8[ 8]] ) | M16( &h->mb.cache.non_zero_count[x264_scan8[10]] );
            int nnz3 = M16( &h->mb.cache.non_zero_count[x264_scan8[12]] ) | M16( &h->mb.cache.non_zero_count[x264_scan8[14]] );
            uint32_t nnztop = pack16to32( !!nnz0, !!nnz1 ) * 0x0101;
            uint32_t nnzbot = pack16to32( !!nnz2, !!nnz3 ) * 0x0101;

            M32( &h->mb.cache.non_zero_count[x264_scan8[0]+8*0] ) = nnztop;
            M32( &h->mb.cache.non_zero_count[x264_scan8[0]+8*1] ) = nnztop;
            M32( &h->mb.cache.non_zero_count[x264_scan8[0]+8*2] ) = nnzbot;
            M32( &h->mb.cache.non_zero_count[x264_scan8[0]+8*3] ) = nnzbot;
        }
    }

    h->loopf.deblock_strength( h->mb.cache.non_zero_count, h->mb.cache.ref, h->mb.cache.mv,
                               bs, 4 >> MB_INTERLACED, h->sh.i_type == SLICE_TYPE_B );

    if( SLICE_MBAFF )
        macroblock_deblock_strength_mbaff( h, bs );
}

static void ALWAYS_INLINE macroblock_store_pic( x264_t *h, int mb_x, int mb_y, int i, int b_chroma, int b_mbaff )
{
    int height = b_chroma ? 16>>CHROMA_V_SHIFT : 16;
    int i_stride = h->fdec->i_stride[i];
    int i_stride2 = i_stride << (b_mbaff && MB_INTERLACED);
    int i_pix_offset = (b_mbaff && MB_INTERLACED)
                     ? 16 * mb_x + height * (mb_y&~1) * i_stride + (mb_y&1) * i_stride
                     : 16 * mb_x + height * mb_y * i_stride;
    if( b_chroma )
        h->mc.store_interleave_chroma( &h->fdec->plane[1][i_pix_offset], i_stride2, h->mb.pic.p_fdec[1], h->mb.pic.p_fdec[2], height );
    else
        h->mc.copy[PIXEL_16x16]( &h->fdec->plane[i][i_pix_offset], i_stride2, h->mb.pic.p_fdec[i], FDEC_STRIDE, 16 );
}

static void ALWAYS_INLINE macroblock_backup_intra( x264_t *h, int mb_x, int mb_y, int b_mbaff )
{
    /* In MBAFF we store the last two rows in intra_border_backup[0] and [1].
     * For progressive mbs this is the bottom two rows, and for interlaced the
     * bottom row of each field. We also store samples needed for the next
     * mbpair in intra_border_backup[2]. */
    int backup_dst = !b_mbaff ? (mb_y&1) : (mb_y&1) ? 1 : MB_INTERLACED ? 0 : 2;
    memcpy( &h->intra_border_backup[backup_dst][0][mb_x*16  ], h->mb.pic.p_fdec[0]+FDEC_STRIDE*15, 16*sizeof(pixel) );
    if( CHROMA444 )
    {
        memcpy( &h->intra_border_backup[backup_dst][1][mb_x*16  ], h->mb.pic.p_fdec[1]+FDEC_STRIDE*15, 16*sizeof(pixel) );
        memcpy( &h->intra_border_backup[backup_dst][2][mb_x*16  ], h->mb.pic.p_fdec[2]+FDEC_STRIDE*15, 16*sizeof(pixel) );
    }
    else
    {
        int backup_src = (15>>CHROMA_V_SHIFT) * FDEC_STRIDE;
        memcpy( &h->intra_border_backup[backup_dst][1][mb_x*16  ], h->mb.pic.p_fdec[1]+backup_src, 8*sizeof(pixel) );
        memcpy( &h->intra_border_backup[backup_dst][1][mb_x*16+8], h->mb.pic.p_fdec[2]+backup_src, 8*sizeof(pixel) );
    }
    if( b_mbaff )
    {
        if( mb_y&1 )
        {
            int backup_src = (MB_INTERLACED ? 7 : 14) * FDEC_STRIDE;
            backup_dst = MB_INTERLACED ? 2 : 0;
            memcpy( &h->intra_border_backup[backup_dst][0][mb_x*16  ], h->mb.pic.p_fdec[0]+backup_src, 16*sizeof(pixel) );
            if( CHROMA444 )
            {
                memcpy( &h->intra_border_backup[backup_dst][1][mb_x*16  ], h->mb.pic.p_fdec[1]+backup_src, 16*sizeof(pixel) );
                memcpy( &h->intra_border_backup[backup_dst][2][mb_x*16  ], h->mb.pic.p_fdec[2]+backup_src, 16*sizeof(pixel) );
            }
            else
            {
                if( CHROMA_FORMAT == CHROMA_420 )
                    backup_src = (MB_INTERLACED ? 3 : 6) * FDEC_STRIDE;
                memcpy( &h->intra_border_backup[backup_dst][1][mb_x*16  ], h->mb.pic.p_fdec[1]+backup_src,  8*sizeof(pixel) );
                memcpy( &h->intra_border_backup[backup_dst][1][mb_x*16+8], h->mb.pic.p_fdec[2]+backup_src,  8*sizeof(pixel) );
            }
        }
    }
}

void x264_macroblock_cache_save( x264_t *h )
{
    const int i_mb_xy = h->mb.i_mb_xy;
    const int i_mb_type = x264_mb_type_fix[h->mb.i_type];
    const int s8x8 = h->mb.i_b8_stride;
    const int s4x4 = h->mb.i_b4_stride;
    const int i_mb_4x4 = h->mb.i_b4_xy;
    const int i_mb_8x8 = h->mb.i_b8_xy;

    /* GCC pessimizes direct stores to heap-allocated arrays due to aliasing. */
    /* By only dereferencing them once, we avoid this issue. */
    int8_t *i4x4 = h->mb.intra4x4_pred_mode[i_mb_xy];
    uint8_t *nnz = h->mb.non_zero_count[i_mb_xy];

    if( SLICE_MBAFF )
    {
        macroblock_backup_intra( h, h->mb.i_mb_x, h->mb.i_mb_y, 1 );
        macroblock_store_pic( h, h->mb.i_mb_x, h->mb.i_mb_y, 0, 0, 1 );
        if( CHROMA444 )
        {
            macroblock_store_pic( h, h->mb.i_mb_x, h->mb.i_mb_y, 1, 0, 1 );
            macroblock_store_pic( h, h->mb.i_mb_x, h->mb.i_mb_y, 2, 0, 1 );
        }
        else
            macroblock_store_pic( h, h->mb.i_mb_x, h->mb.i_mb_y, 1, 1, 1 );
    }
    else
    {
        macroblock_backup_intra( h, h->mb.i_mb_x, h->mb.i_mb_y, 0 );
        macroblock_store_pic( h, h->mb.i_mb_x, h->mb.i_mb_y, 0, 0, 0 );
        if( CHROMA444 )
        {
            macroblock_store_pic( h, h->mb.i_mb_x, h->mb.i_mb_y, 1, 0, 0 );
            macroblock_store_pic( h, h->mb.i_mb_x, h->mb.i_mb_y, 2, 0, 0 );
        }
        else
            macroblock_store_pic( h, h->mb.i_mb_x, h->mb.i_mb_y, 1, 1, 0 );
    }

    x264_prefetch_fenc( h, h->fdec, h->mb.i_mb_x, h->mb.i_mb_y );

    h->mb.type[i_mb_xy] = i_mb_type;
    h->mb.slice_table[i_mb_xy] = h->sh.i_first_mb;
    h->mb.partition[i_mb_xy] = IS_INTRA( i_mb_type ) ? D_16x16 : h->mb.i_partition;
    h->mb.i_mb_prev_xy = i_mb_xy;

    /* save intra4x4 */
    if( i_mb_type == I_4x4 )
    {
        CP32( &i4x4[0], &h->mb.cache.intra4x4_pred_mode[x264_scan8[10]] );
        M32( &i4x4[4] ) = pack8to32( h->mb.cache.intra4x4_pred_mode[x264_scan8[5] ],
                                     h->mb.cache.intra4x4_pred_mode[x264_scan8[7] ],
                                     h->mb.cache.intra4x4_pred_mode[x264_scan8[13] ], 0);
    }
    else if( !h->param.b_constrained_intra || IS_INTRA(i_mb_type) )
        M64( i4x4 ) = I_PRED_4x4_DC * 0x0101010101010101ULL;
    else
        M64( i4x4 ) = (uint8_t)(-1) * 0x0101010101010101ULL;


    if( i_mb_type == I_PCM )
    {
        h->mb.qp[i_mb_xy] = 0;
        h->mb.i_last_dqp = 0;
        h->mb.i_cbp_chroma = CHROMA444 ? 0 : 2;
        h->mb.i_cbp_luma = 0xf;
        h->mb.cbp[i_mb_xy] = (h->mb.i_cbp_chroma << 4) | h->mb.i_cbp_luma | 0x1700;
        h->mb.b_transform_8x8 = 0;
        for( int i = 0; i < 48; i++ )
            h->mb.cache.non_zero_count[x264_scan8[i]] = h->param.b_cabac ? 1 : 16;
    }
    else
    {
        if( h->mb.i_type != I_16x16 && h->mb.i_cbp_luma == 0 && h->mb.i_cbp_chroma == 0 )
            h->mb.i_qp = h->mb.i_last_qp;
        h->mb.qp[i_mb_xy] = h->mb.i_qp;
        h->mb.i_last_dqp = h->mb.i_qp - h->mb.i_last_qp;
        h->mb.i_last_qp = h->mb.i_qp;
    }

    /* save non zero count */
    CP32( &nnz[ 0+0*4], &h->mb.cache.non_zero_count[x264_scan8[ 0]] );
    CP32( &nnz[ 0+1*4], &h->mb.cache.non_zero_count[x264_scan8[ 2]] );
    CP32( &nnz[ 0+2*4], &h->mb.cache.non_zero_count[x264_scan8[ 8]] );
    CP32( &nnz[ 0+3*4], &h->mb.cache.non_zero_count[x264_scan8[10]] );
    CP32( &nnz[16+0*4], &h->mb.cache.non_zero_count[x264_scan8[16+0]] );
    CP32( &nnz[16+1*4], &h->mb.cache.non_zero_count[x264_scan8[16+2]] );
    CP32( &nnz[32+0*4], &h->mb.cache.non_zero_count[x264_scan8[32+0]] );
    CP32( &nnz[32+1*4], &h->mb.cache.non_zero_count[x264_scan8[32+2]] );
    if( CHROMA_FORMAT >= CHROMA_422 )
    {
        CP32( &nnz[16+2*4], &h->mb.cache.non_zero_count[x264_scan8[16+ 8]] );
        CP32( &nnz[16+3*4], &h->mb.cache.non_zero_count[x264_scan8[16+10]] );
        CP32( &nnz[32+2*4], &h->mb.cache.non_zero_count[x264_scan8[32+ 8]] );
        CP32( &nnz[32+3*4], &h->mb.cache.non_zero_count[x264_scan8[32+10]] );
    }

    if( h->mb.i_cbp_luma == 0 && h->mb.i_type != I_8x8 )
        h->mb.b_transform_8x8 = 0;
    h->mb.mb_transform_size[i_mb_xy] = h->mb.b_transform_8x8;

    if( h->sh.i_type != SLICE_TYPE_I )
    {
        int16_t (*mv0)[2] = &h->mb.mv[0][i_mb_4x4];
        int16_t (*mv1)[2] = &h->mb.mv[1][i_mb_4x4];
        int8_t *ref0 = &h->mb.ref[0][i_mb_8x8];
        int8_t *ref1 = &h->mb.ref[1][i_mb_8x8];
        if( !IS_INTRA( i_mb_type ) )
        {
            ref0[0+0*s8x8] = h->mb.cache.ref[0][x264_scan8[0]];
            ref0[1+0*s8x8] = h->mb.cache.ref[0][x264_scan8[4]];
            ref0[0+1*s8x8] = h->mb.cache.ref[0][x264_scan8[8]];
            ref0[1+1*s8x8] = h->mb.cache.ref[0][x264_scan8[12]];
            CP128( &mv0[0*s4x4], h->mb.cache.mv[0][x264_scan8[0]+8*0] );
            CP128( &mv0[1*s4x4], h->mb.cache.mv[0][x264_scan8[0]+8*1] );
            CP128( &mv0[2*s4x4], h->mb.cache.mv[0][x264_scan8[0]+8*2] );
            CP128( &mv0[3*s4x4], h->mb.cache.mv[0][x264_scan8[0]+8*3] );
            if( h->sh.i_type == SLICE_TYPE_B )
            {
                ref1[0+0*s8x8] = h->mb.cache.ref[1][x264_scan8[0]];
                ref1[1+0*s8x8] = h->mb.cache.ref[1][x264_scan8[4]];
                ref1[0+1*s8x8] = h->mb.cache.ref[1][x264_scan8[8]];
                ref1[1+1*s8x8] = h->mb.cache.ref[1][x264_scan8[12]];
                CP128( &mv1[0*s4x4], h->mb.cache.mv[1][x264_scan8[0]+8*0] );
                CP128( &mv1[1*s4x4], h->mb.cache.mv[1][x264_scan8[0]+8*1] );
                CP128( &mv1[2*s4x4], h->mb.cache.mv[1][x264_scan8[0]+8*2] );
                CP128( &mv1[3*s4x4], h->mb.cache.mv[1][x264_scan8[0]+8*3] );
            }
        }
        else
        {
            M16( &ref0[0*s8x8] ) = (uint8_t)(-1) * 0x0101;
            M16( &ref0[1*s8x8] ) = (uint8_t)(-1) * 0x0101;
            M128( &mv0[0*s4x4] ) = M128_ZERO;
            M128( &mv0[1*s4x4] ) = M128_ZERO;
            M128( &mv0[2*s4x4] ) = M128_ZERO;
            M128( &mv0[3*s4x4] ) = M128_ZERO;
            if( h->sh.i_type == SLICE_TYPE_B )
            {
                M16( &ref1[0*s8x8] ) = (uint8_t)(-1) * 0x0101;
                M16( &ref1[1*s8x8] ) = (uint8_t)(-1) * 0x0101;
                M128( &mv1[0*s4x4] ) = M128_ZERO;
                M128( &mv1[1*s4x4] ) = M128_ZERO;
                M128( &mv1[2*s4x4] ) = M128_ZERO;
                M128( &mv1[3*s4x4] ) = M128_ZERO;
            }
        }
    }

    if( h->param.b_cabac )
    {
        uint8_t (*mvd0)[2] = h->mb.mvd[0][i_mb_xy];
        uint8_t (*mvd1)[2] = h->mb.mvd[1][i_mb_xy];
        if( IS_INTRA(i_mb_type) && i_mb_type != I_PCM )
            h->mb.chroma_pred_mode[i_mb_xy] = x264_mb_chroma_pred_mode_fix[h->mb.i_chroma_pred_mode];
        else
            h->mb.chroma_pred_mode[i_mb_xy] = I_PRED_CHROMA_DC;

        if( (0x3FF30 >> i_mb_type) & 1 ) /* !INTRA && !SKIP && !DIRECT */
        {
            CP64( mvd0[0], h->mb.cache.mvd[0][x264_scan8[10]] );
            CP16( mvd0[4], h->mb.cache.mvd[0][x264_scan8[5 ]] );
            CP16( mvd0[5], h->mb.cache.mvd[0][x264_scan8[7 ]] );
            CP16( mvd0[6], h->mb.cache.mvd[0][x264_scan8[13]] );
            if( h->sh.i_type == SLICE_TYPE_B )
            {
                CP64( mvd1[0], h->mb.cache.mvd[1][x264_scan8[10]] );
                CP16( mvd1[4], h->mb.cache.mvd[1][x264_scan8[5 ]] );
                CP16( mvd1[5], h->mb.cache.mvd[1][x264_scan8[7 ]] );
                CP16( mvd1[6], h->mb.cache.mvd[1][x264_scan8[13]] );
            }
        }
        else
        {
            M128( mvd0[0] ) = M128_ZERO;
            if( h->sh.i_type == SLICE_TYPE_B )
                M128( mvd1[0] ) = M128_ZERO;
        }

        if( h->sh.i_type == SLICE_TYPE_B )
        {
            if( i_mb_type == B_SKIP || i_mb_type == B_DIRECT )
                h->mb.skipbp[i_mb_xy] = 0xf;
            else if( i_mb_type == B_8x8 )
            {
                int skipbp = ( h->mb.i_sub_partition[0] == D_DIRECT_8x8 ) << 0;
                skipbp    |= ( h->mb.i_sub_partition[1] == D_DIRECT_8x8 ) << 1;
                skipbp    |= ( h->mb.i_sub_partition[2] == D_DIRECT_8x8 ) << 2;
                skipbp    |= ( h->mb.i_sub_partition[3] == D_DIRECT_8x8 ) << 3;
                h->mb.skipbp[i_mb_xy] = skipbp;
            }
            else
                h->mb.skipbp[i_mb_xy] = 0;
        }
    }
}


void x264_macroblock_bipred_init( x264_t *h )
{
    for( int mbfield = 0; mbfield <= SLICE_MBAFF; mbfield++ )
        for( int field = 0; field <= SLICE_MBAFF; field++ )
            for( int i_ref0 = 0; i_ref0 < (h->i_ref[0]<<mbfield); i_ref0++ )
            {
                x264_frame_t *l0 = h->fref[0][i_ref0>>mbfield];
                int poc0 = l0->i_poc + mbfield*l0->i_delta_poc[field^(i_ref0&1)];
                for( int i_ref1 = 0; i_ref1 < (h->i_ref[1]<<mbfield); i_ref1++ )
                {
                    int dist_scale_factor;
                    x264_frame_t *l1 = h->fref[1][i_ref1>>mbfield];
                    int cur_poc = h->fdec->i_poc + mbfield*h->fdec->i_delta_poc[field];
                    int poc1 = l1->i_poc + mbfield*l1->i_delta_poc[field^(i_ref1&1)];
                    int td = x264_clip3( poc1 - poc0, -128, 127 );
                    if( td == 0 /* || pic0 is a long-term ref */ )
                        dist_scale_factor = 256;
                    else
                    {
                        int tb = x264_clip3( cur_poc - poc0, -128, 127 );
                        int tx = (16384 + (abs(td) >> 1)) / td;
                        dist_scale_factor = x264_clip3( (tb * tx + 32) >> 6, -1024, 1023 );
                    }

                    h->mb.dist_scale_factor_buf[mbfield][field][i_ref0][i_ref1] = dist_scale_factor;

                    dist_scale_factor >>= 2;
                    if( h->param.analyse.b_weighted_bipred
                          && dist_scale_factor >= -64
                          && dist_scale_factor <= 128 )
                    {
                        h->mb.bipred_weight_buf[mbfield][field][i_ref0][i_ref1] = 64 - dist_scale_factor;
                        // ssse3 implementation of biweight doesn't support the extrema.
                        // if we ever generate them, we'll have to drop that optimization.
                        assert( dist_scale_factor >= -63 && dist_scale_factor <= 127 );
                    }
                    else
                        h->mb.bipred_weight_buf[mbfield][field][i_ref0][i_ref1] = 32;
                }
            }
}

