macroblock.c 56.5 KB
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/*****************************************************************************
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 * macroblock.c: macroblock encoding
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 *****************************************************************************
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 * Copyright (C) 2003-2016 x264 project
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 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
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 *          Loren Merritt <lorenm@u.washington.edu>
 *          Fiona Glaser <fiona@x264.com>
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 *          Henrik Gramner <henrik@gramner.com>
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 *
 * 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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
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 *
 * This program is also available under a commercial proprietary license.
 * For more information, contact us at licensing@x264.com.
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 *****************************************************************************/

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#include "common/common.h"
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#include "macroblock.h"

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/* These chroma DC functions don't have assembly versions and are only used here. */

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#define ZIG(i,y,x) level[i] = dct[x*2+y];
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static inline void zigzag_scan_2x2_dc( dctcoef level[4], dctcoef dct[4] )
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{
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    ZIG(0,0,0)
    ZIG(1,0,1)
    ZIG(2,1,0)
    ZIG(3,1,1)
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}
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#undef ZIG
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static inline void zigzag_scan_2x4_dc( dctcoef level[8], dctcoef dct[8] )
{
    level[0] = dct[0];
    level[1] = dct[2];
    level[2] = dct[1];
    level[3] = dct[4];
    level[4] = dct[6];
    level[5] = dct[3];
    level[6] = dct[5];
    level[7] = dct[7];
}

#define IDCT_DEQUANT_2X2_START \
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    int d0 = dct[0] + dct[1]; \
    int d1 = dct[2] + dct[3]; \
    int d2 = dct[0] - dct[1]; \
    int d3 = dct[2] - dct[3]; \
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    int dmf = dequant_mf[i_qp%6][0] << i_qp/6;
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static inline void idct_dequant_2x2_dc( dctcoef dct[4], dctcoef dct4x4[4][16], int dequant_mf[6][16], int i_qp )
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{
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    IDCT_DEQUANT_2X2_START
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    dct4x4[0][0] = (d0 + d1) * dmf >> 5;
    dct4x4[1][0] = (d0 - d1) * dmf >> 5;
    dct4x4[2][0] = (d2 + d3) * dmf >> 5;
    dct4x4[3][0] = (d2 - d3) * dmf >> 5;
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}

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static inline void idct_dequant_2x2_dconly( dctcoef dct[4], int dequant_mf[6][16], int i_qp )
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{
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    IDCT_DEQUANT_2X2_START
    dct[0] = (d0 + d1) * dmf >> 5;
    dct[1] = (d0 - d1) * dmf >> 5;
    dct[2] = (d2 + d3) * dmf >> 5;
    dct[3] = (d2 - d3) * dmf >> 5;
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}
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#undef IDCT_2X2_DEQUANT_START
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static inline void dct2x2dc( dctcoef d[4], dctcoef dct4x4[4][16] )
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{
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    int d0 = dct4x4[0][0] + dct4x4[1][0];
    int d1 = dct4x4[2][0] + dct4x4[3][0];
    int d2 = dct4x4[0][0] - dct4x4[1][0];
    int d3 = dct4x4[2][0] - dct4x4[3][0];
    d[0] = d0 + d1;
    d[2] = d2 + d3;
    d[1] = d0 - d1;
    d[3] = d2 - d3;
    dct4x4[0][0] = 0;
    dct4x4[1][0] = 0;
    dct4x4[2][0] = 0;
    dct4x4[3][0] = 0;
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}

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static ALWAYS_INLINE int array_non_zero( dctcoef *v, int i_count )
{
    if( WORD_SIZE == 8 )
    {
        for( int i = 0; i < i_count; i += 8/sizeof(dctcoef) )
            if( M64( &v[i] ) )
                return 1;
    }
    else
    {
        for( int i = 0; i < i_count; i += 4/sizeof(dctcoef) )
            if( M32( &v[i] ) )
                return 1;
    }
    return 0;
}

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/* All encoding functions must output the correct CBP and NNZ values.
 * The entropy coding functions will check CBP first, then NNZ, before
 * actually reading the DCT coefficients.  NNZ still must be correct even
 * if CBP is zero because of the use of NNZ values for context selection.
 * "NNZ" need only be 0 or 1 rather than the exact coefficient count because
 * that is only needed in CAVLC, and will be calculated by CAVLC's residual
 * coding and stored as necessary. */

/* This means that decimation can be done merely by adjusting the CBP and NNZ
 * rather than memsetting the coefficients. */

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static void x264_mb_encode_i16x16( x264_t *h, int p, int i_qp )
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{
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    pixel *p_src = h->mb.pic.p_fenc[p];
    pixel *p_dst = h->mb.pic.p_fdec[p];
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    ALIGNED_ARRAY_N( dctcoef, dct4x4,[16],[16] );
    ALIGNED_ARRAY_N( dctcoef, dct_dc4x4,[16] );
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    int nz, block_cbp = 0;
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    int decimate_score = h->mb.b_dct_decimate ? 0 : 9;
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    int i_quant_cat = p ? CQM_4IC : CQM_4IY;
    int i_mode = h->mb.i_intra16x16_pred_mode;

    if( h->mb.b_lossless )
        x264_predict_lossless_16x16( h, p, i_mode );
    else
        h->predict_16x16[i_mode]( h->mb.pic.p_fdec[p] );
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    if( h->mb.b_lossless )
    {
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        for( int i = 0; i < 16; i++ )
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        {
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            int oe = block_idx_xy_fenc[i];
            int od = block_idx_xy_fdec[i];
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            nz = h->zigzagf.sub_4x4ac( h->dct.luma4x4[16*p+i], p_src+oe, p_dst+od, &dct_dc4x4[block_idx_yx_1d[i]] );
            h->mb.cache.non_zero_count[x264_scan8[16*p+i]] = nz;
            block_cbp |= nz;
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        }
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        h->mb.i_cbp_luma |= block_cbp * 0xf;
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        h->mb.cache.non_zero_count[x264_scan8[LUMA_DC+p]] = array_non_zero( dct_dc4x4, 16 );
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        h->zigzagf.scan_4x4( h->dct.luma16x16_dc[p], dct_dc4x4 );
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        return;
    }

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    CLEAR_16x16_NNZ( p );
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    h->dctf.sub16x16_dct( dct4x4, p_src, p_dst );
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    if( h->mb.b_noise_reduction )
        for( int idx = 0; idx < 16; idx++ )
            h->quantf.denoise_dct( dct4x4[idx], h->nr_residual_sum[0], h->nr_offset[0], 16 );

    for( int idx = 0; idx < 16; idx++ )
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    {
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        dct_dc4x4[block_idx_xy_1d[idx]] = dct4x4[idx][0];
        dct4x4[idx][0] = 0;
    }
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    if( h->mb.b_trellis )
    {
        for( int idx = 0; idx < 16; idx++ )
            if( x264_quant_4x4_trellis( h, dct4x4[idx], i_quant_cat, i_qp, ctx_cat_plane[DCT_LUMA_AC][p], 1, !!p, idx ) )
            {
                block_cbp = 0xf;
                h->zigzagf.scan_4x4( h->dct.luma4x4[16*p+idx], dct4x4[idx] );
                h->quantf.dequant_4x4( dct4x4[idx], h->dequant4_mf[i_quant_cat], i_qp );
                if( decimate_score < 6 ) decimate_score += h->quantf.decimate_score15( h->dct.luma4x4[16*p+idx] );
                h->mb.cache.non_zero_count[x264_scan8[16*p+idx]] = 1;
            }
    }
    else
    {
        for( int i8x8 = 0; i8x8 < 4; i8x8++ )
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        {
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            nz = h->quantf.quant_4x4x4( &dct4x4[i8x8*4], h->quant4_mf[i_quant_cat][i_qp], h->quant4_bias[i_quant_cat][i_qp] );
            if( nz )
            {
                block_cbp = 0xf;
                FOREACH_BIT( idx, i8x8*4, nz )
                {
                    h->zigzagf.scan_4x4( h->dct.luma4x4[16*p+idx], dct4x4[idx] );
                    h->quantf.dequant_4x4( dct4x4[idx], h->dequant4_mf[i_quant_cat], i_qp );
                    if( decimate_score < 6 ) decimate_score += h->quantf.decimate_score15( h->dct.luma4x4[16*p+idx] );
                    h->mb.cache.non_zero_count[x264_scan8[16*p+idx]] = 1;
                }
            }
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        }
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    }

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    /* Writing the 16 CBFs in an i16x16 block is quite costly, so decimation can save many bits. */
    /* More useful with CAVLC, but still useful with CABAC. */
    if( decimate_score < 6 )
    {
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        CLEAR_16x16_NNZ( p );
        block_cbp = 0;
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    }
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    else
        h->mb.i_cbp_luma |= block_cbp;
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    h->dctf.dct4x4dc( dct_dc4x4 );
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    if( h->mb.b_trellis )
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        nz = x264_quant_luma_dc_trellis( h, dct_dc4x4, i_quant_cat, i_qp, ctx_cat_plane[DCT_LUMA_DC][p], 1, LUMA_DC+p );
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    else
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        nz = h->quantf.quant_4x4_dc( dct_dc4x4, h->quant4_mf[i_quant_cat][i_qp][0]>>1, h->quant4_bias[i_quant_cat][i_qp][0]<<1 );
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    h->mb.cache.non_zero_count[x264_scan8[LUMA_DC+p]] = nz;
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    if( nz )
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    {
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        h->zigzagf.scan_4x4( h->dct.luma16x16_dc[p], dct_dc4x4 );
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        /* output samples to fdec */
        h->dctf.idct4x4dc( dct_dc4x4 );
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        h->quantf.dequant_4x4_dc( dct_dc4x4, h->dequant4_mf[i_quant_cat], i_qp );  /* XXX not inversed */
        if( block_cbp )
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            for( int i = 0; i < 16; i++ )
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                dct4x4[i][0] = dct_dc4x4[block_idx_xy_1d[i]];
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    }
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    /* put pixels to fdec */
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    if( block_cbp )
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        h->dctf.add16x16_idct( p_dst, dct4x4 );
    else if( nz )
        h->dctf.add16x16_idct_dc( p_dst, dct_dc4x4 );
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}

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/* Round down coefficients losslessly in DC-only chroma blocks.
 * Unlike luma blocks, this can't be done with a lookup table or
 * other shortcut technique because of the interdependencies
 * between the coefficients due to the chroma DC transform. */
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static ALWAYS_INLINE int x264_mb_optimize_chroma_dc( x264_t *h, dctcoef *dct_dc, int dequant_mf[6][16], int i_qp, int chroma422 )
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{
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    int dmf = dequant_mf[i_qp%6][0] << i_qp/6;
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    /* If the QP is too high, there's no benefit to rounding optimization. */
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    if( dmf > 32*64 )
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        return 1;

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    if( chroma422 )
        return h->quantf.optimize_chroma_2x4_dc( dct_dc, dmf );
    else
        return h->quantf.optimize_chroma_2x2_dc( dct_dc, dmf );
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}

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static ALWAYS_INLINE void x264_mb_encode_chroma_internal( x264_t *h, int b_inter, int i_qp, int chroma422 )
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{
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    int nz, nz_dc;
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    int b_decimate = b_inter && h->mb.b_dct_decimate;
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    int (*dequant_mf)[16] = h->dequant4_mf[CQM_4IC + b_inter];
    ALIGNED_ARRAY_16( dctcoef, dct_dc,[8] );
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    h->mb.i_cbp_chroma = 0;
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    h->nr_count[2] += h->mb.b_noise_reduction * 4;
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    M16( &h->mb.cache.non_zero_count[x264_scan8[16]] ) = 0;
    M16( &h->mb.cache.non_zero_count[x264_scan8[18]] ) = 0;
    M16( &h->mb.cache.non_zero_count[x264_scan8[32]] ) = 0;
    M16( &h->mb.cache.non_zero_count[x264_scan8[34]] ) = 0;
    if( chroma422 )
    {
        M16( &h->mb.cache.non_zero_count[x264_scan8[24]] ) = 0;
        M16( &h->mb.cache.non_zero_count[x264_scan8[26]] ) = 0;
        M16( &h->mb.cache.non_zero_count[x264_scan8[40]] ) = 0;
        M16( &h->mb.cache.non_zero_count[x264_scan8[42]] ) = 0;
    }

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    /* Early termination: check variance of chroma residual before encoding.
     * Don't bother trying early termination at low QPs.
     * Values are experimentally derived. */
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    if( b_decimate && i_qp >= (h->mb.b_trellis ? 12 : 18) && !h->mb.b_noise_reduction )
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    {
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        int thresh = chroma422 ? (x264_lambda2_tab[i_qp] + 16) >> 5 : (x264_lambda2_tab[i_qp] + 32) >> 6;
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        int ssd[2];
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        int chromapix = chroma422 ? PIXEL_8x16 : PIXEL_8x8;

        int score  = h->pixf.var2[chromapix]( h->mb.pic.p_fenc[1], FENC_STRIDE, h->mb.pic.p_fdec[1], FDEC_STRIDE, &ssd[0] );
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        if( score < thresh*4 )
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            score += h->pixf.var2[chromapix]( h->mb.pic.p_fenc[2], FENC_STRIDE, h->mb.pic.p_fdec[2], FDEC_STRIDE, &ssd[1] );
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        if( score < thresh*4 )
        {
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            h->mb.cache.non_zero_count[x264_scan8[CHROMA_DC+0]] = 0;
            h->mb.cache.non_zero_count[x264_scan8[CHROMA_DC+1]] = 0;
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            for( int ch = 0; ch < 2; ch++ )
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            {
                if( ssd[ch] > thresh )
                {
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                    pixel *p_src = h->mb.pic.p_fenc[1+ch];
                    pixel *p_dst = h->mb.pic.p_fdec[1+ch];

                    if( chroma422 )
                        /* Cannot be replaced by two calls to sub8x8_dct_dc since the hadamard transform is different */
                        h->dctf.sub8x16_dct_dc( dct_dc, p_src, p_dst );
                    else
                        h->dctf.sub8x8_dct_dc( dct_dc, p_src, p_dst );

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                    if( h->mb.b_trellis )
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                        nz_dc = x264_quant_chroma_dc_trellis( h, dct_dc, i_qp+3*chroma422, !b_inter, CHROMA_DC+ch );
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                    else
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                    {
                        nz_dc = 0;
                        for( int i = 0; i <= chroma422; i++ )
                            nz_dc |= h->quantf.quant_2x2_dc( &dct_dc[4*i], h->quant4_mf[CQM_4IC+b_inter][i_qp+3*chroma422][0] >> 1,
                                                             h->quant4_bias[CQM_4IC+b_inter][i_qp+3*chroma422][0] << 1 );
                    }
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                    if( nz_dc )
                    {
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                        if( !x264_mb_optimize_chroma_dc( h, dct_dc, dequant_mf, i_qp+3*chroma422, chroma422 ) )
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                            continue;
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                        h->mb.cache.non_zero_count[x264_scan8[CHROMA_DC+ch]] = 1;
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                        if( chroma422 )
                        {
                            zigzag_scan_2x4_dc( h->dct.chroma_dc[ch], dct_dc );
                            h->quantf.idct_dequant_2x4_dconly( dct_dc, dequant_mf, i_qp+3 );
                        }
                        else
                        {
                            zigzag_scan_2x2_dc( h->dct.chroma_dc[ch], dct_dc );
                            idct_dequant_2x2_dconly( dct_dc, dequant_mf, i_qp );
                        }

                        for( int i = 0; i <= chroma422; i++ )
                            h->dctf.add8x8_idct_dc( p_dst + 8*i*FDEC_STRIDE, &dct_dc[4*i] );
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                        h->mb.i_cbp_chroma = 1;
                    }
                }
            }
            return;
        }
    }

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    for( int ch = 0; ch < 2; ch++ )
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    {
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        pixel *p_src = h->mb.pic.p_fenc[1+ch];
        pixel *p_dst = h->mb.pic.p_fdec[1+ch];
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        int i_decimate_score = b_decimate ? 0 : 7;
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        int nz_ac = 0;
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        ALIGNED_ARRAY_N( dctcoef, dct4x4,[8],[16] );
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        if( h->mb.b_lossless )
        {
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            static const uint8_t chroma422_scan[8] = { 0, 2, 1, 5, 3, 6, 4, 7 };

            for( int i = 0; i < (chroma422?8:4); i++ )
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            {
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                int oe = 4*(i&1) + 4*(i>>1)*FENC_STRIDE;
                int od = 4*(i&1) + 4*(i>>1)*FDEC_STRIDE;
                nz = h->zigzagf.sub_4x4ac( h->dct.luma4x4[16+i+(chroma422?i&4:0)+ch*16], p_src+oe, p_dst+od,
                                           &h->dct.chroma_dc[ch][chroma422?chroma422_scan[i]:i] );
                h->mb.cache.non_zero_count[x264_scan8[16+i+(chroma422?i&4:0)+ch*16]] = nz;
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                h->mb.i_cbp_chroma |= nz;
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            }
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            h->mb.cache.non_zero_count[x264_scan8[CHROMA_DC+ch]] = array_non_zero( h->dct.chroma_dc[ch], chroma422?8:4 );
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            continue;
        }
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        for( int i = 0; i <= chroma422; i++ )
            h->dctf.sub8x8_dct( &dct4x4[4*i], p_src + 8*i*FENC_STRIDE, p_dst + 8*i*FDEC_STRIDE );

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        if( h->mb.b_noise_reduction )
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            for( int i = 0; i < (chroma422?8:4); i++ )
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                h->quantf.denoise_dct( dct4x4[i], h->nr_residual_sum[2], h->nr_offset[2], 16 );
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        if( chroma422 )
            h->dctf.dct2x4dc( dct_dc, dct4x4 );
        else
            dct2x2dc( dct_dc, dct4x4 );

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        /* calculate dct coeffs */
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        for( int i8x8 = 0; i8x8 < (chroma422?2:1); i8x8++ )
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        {
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            if( h->mb.b_trellis )
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            {
                for( int i4x4 = 0; i4x4 < 4; i4x4++ )
                {
                    if( x264_quant_4x4_trellis( h, dct4x4[i8x8*4+i4x4], CQM_4IC+b_inter, i_qp, DCT_CHROMA_AC, !b_inter, 1, 0 ) )
                    {
                        int idx = 16+ch*16+i8x8*8+i4x4;
                        h->zigzagf.scan_4x4( h->dct.luma4x4[idx], dct4x4[i8x8*4+i4x4] );
                        h->quantf.dequant_4x4( dct4x4[i8x8*4+i4x4], dequant_mf, i_qp );
                        if( i_decimate_score < 7 )
                            i_decimate_score += h->quantf.decimate_score15( h->dct.luma4x4[idx] );
                        h->mb.cache.non_zero_count[x264_scan8[idx]] = 1;
                        nz_ac = 1;
                    }
                }
            }
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            else
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            {
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                nz = h->quantf.quant_4x4x4( &dct4x4[i8x8*4], h->quant4_mf[CQM_4IC+b_inter][i_qp],
                                            h->quant4_bias[CQM_4IC+b_inter][i_qp] );
                nz_ac |= nz;

                FOREACH_BIT( i4x4, 0, nz )
                {
                    int idx = 16+ch*16+i8x8*8+i4x4;

                    h->zigzagf.scan_4x4( h->dct.luma4x4[idx], dct4x4[i8x8*4+i4x4] );
                    h->quantf.dequant_4x4( dct4x4[i8x8*4+i4x4], dequant_mf, i_qp );
                    if( i_decimate_score < 7 )
                        i_decimate_score += h->quantf.decimate_score15( h->dct.luma4x4[idx] );
                    h->mb.cache.non_zero_count[x264_scan8[idx]] = 1;
                }
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            }
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        }

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        if( h->mb.b_trellis )
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            nz_dc = x264_quant_chroma_dc_trellis( h, dct_dc, i_qp+3*chroma422, !b_inter, CHROMA_DC+ch );
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        else
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        {
            nz_dc = 0;
            for( int i = 0; i <= chroma422; i++ )
                nz_dc |= h->quantf.quant_2x2_dc( &dct_dc[4*i], h->quant4_mf[CQM_4IC+b_inter][i_qp+3*chroma422][0] >> 1,
                                                 h->quant4_bias[CQM_4IC+b_inter][i_qp+3*chroma422][0] << 1 );
        }
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        h->mb.cache.non_zero_count[x264_scan8[CHROMA_DC+ch]] = nz_dc;
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        if( i_decimate_score < 7 || !nz_ac )
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        {
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            /* Decimate the block */
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            M16( &h->mb.cache.non_zero_count[x264_scan8[16+16*ch]] ) = 0;
            M16( &h->mb.cache.non_zero_count[x264_scan8[18+16*ch]] ) = 0;
            if( chroma422 )
            {
                M16( &h->mb.cache.non_zero_count[x264_scan8[24+16*ch]] ) = 0;
                M16( &h->mb.cache.non_zero_count[x264_scan8[26+16*ch]] ) = 0;
            }

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            if( !nz_dc ) /* Whole block is empty */
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                continue;
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            if( !x264_mb_optimize_chroma_dc( h, dct_dc, dequant_mf, i_qp+3*chroma422, chroma422 ) )
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            {
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                h->mb.cache.non_zero_count[x264_scan8[CHROMA_DC+ch]] = 0;
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                continue;
            }
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            /* DC-only */
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            if( chroma422 )
            {
                zigzag_scan_2x4_dc( h->dct.chroma_dc[ch], dct_dc );
                h->quantf.idct_dequant_2x4_dconly( dct_dc, dequant_mf, i_qp+3 );
            }
            else
            {
                zigzag_scan_2x2_dc( h->dct.chroma_dc[ch], dct_dc );
                idct_dequant_2x2_dconly( dct_dc, dequant_mf, i_qp );
            }

            for( int i = 0; i <= chroma422; i++ )
                h->dctf.add8x8_idct_dc( p_dst + 8*i*FDEC_STRIDE, &dct_dc[4*i] );
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        }
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        else
        {
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            h->mb.i_cbp_chroma = 1;
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            if( nz_dc )
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            {
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                if( chroma422 )
                {
                    zigzag_scan_2x4_dc( h->dct.chroma_dc[ch], dct_dc );
                    h->quantf.idct_dequant_2x4_dc( dct_dc, dct4x4, dequant_mf, i_qp+3 );
                }
                else
                {
                    zigzag_scan_2x2_dc( h->dct.chroma_dc[ch], dct_dc );
                    idct_dequant_2x2_dc( dct_dc, dct4x4, dequant_mf, i_qp );
                }
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            }
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            for( int i = 0; i <= chroma422; i++ )
                h->dctf.add8x8_idct( p_dst + 8*i*FDEC_STRIDE, &dct4x4[4*i] );
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        }
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    }
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    /* 0 = none, 1 = DC only, 2 = DC+AC */
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    h->mb.i_cbp_chroma += (h->mb.cache.non_zero_count[x264_scan8[CHROMA_DC+0]] |
                           h->mb.cache.non_zero_count[x264_scan8[CHROMA_DC+1]] | h->mb.i_cbp_chroma);
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}

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void x264_mb_encode_chroma( x264_t *h, int b_inter, int i_qp )
{
    if( CHROMA_FORMAT == CHROMA_420 )
        x264_mb_encode_chroma_internal( h, b_inter, i_qp, 0 );
    else
        x264_mb_encode_chroma_internal( h, b_inter, i_qp, 1 );
}

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static void x264_macroblock_encode_skip( x264_t *h )
{
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    M32( &h->mb.cache.non_zero_count[x264_scan8[ 0]] ) = 0;
    M32( &h->mb.cache.non_zero_count[x264_scan8[ 2]] ) = 0;
    M32( &h->mb.cache.non_zero_count[x264_scan8[ 8]] ) = 0;
    M32( &h->mb.cache.non_zero_count[x264_scan8[10]] ) = 0;
    M32( &h->mb.cache.non_zero_count[x264_scan8[16+ 0]] ) = 0;
    M32( &h->mb.cache.non_zero_count[x264_scan8[16+ 2]] ) = 0;
    M32( &h->mb.cache.non_zero_count[x264_scan8[32+ 0]] ) = 0;
    M32( &h->mb.cache.non_zero_count[x264_scan8[32+ 2]] ) = 0;
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    if( CHROMA_FORMAT >= CHROMA_422 )
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    {
        M32( &h->mb.cache.non_zero_count[x264_scan8[16+ 8]] ) = 0;
        M32( &h->mb.cache.non_zero_count[x264_scan8[16+10]] ) = 0;
        M32( &h->mb.cache.non_zero_count[x264_scan8[32+ 8]] ) = 0;
        M32( &h->mb.cache.non_zero_count[x264_scan8[32+10]] ) = 0;
    }
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    h->mb.i_cbp_luma = 0;
    h->mb.i_cbp_chroma = 0;
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    h->mb.cbp[h->mb.i_mb_xy] = 0;
}

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/*****************************************************************************
 * Intra prediction for predictive lossless mode.
 *****************************************************************************/

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void x264_predict_lossless_chroma( x264_t *h, int i_mode )
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{
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    int height = 16 >> CHROMA_V_SHIFT;
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    if( i_mode == I_PRED_CHROMA_V )
    {
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        h->mc.copy[PIXEL_8x8]( h->mb.pic.p_fdec[1], FDEC_STRIDE, h->mb.pic.p_fenc[1]-FENC_STRIDE, FENC_STRIDE, height );
        h->mc.copy[PIXEL_8x8]( h->mb.pic.p_fdec[2], FDEC_STRIDE, h->mb.pic.p_fenc[2]-FENC_STRIDE, FENC_STRIDE, height );
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        memcpy( h->mb.pic.p_fdec[1], h->mb.pic.p_fdec[1]-FDEC_STRIDE, 8*sizeof(pixel) );
        memcpy( h->mb.pic.p_fdec[2], h->mb.pic.p_fdec[2]-FDEC_STRIDE, 8*sizeof(pixel) );
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    }
    else if( i_mode == I_PRED_CHROMA_H )
    {
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        h->mc.copy[PIXEL_8x8]( h->mb.pic.p_fdec[1], FDEC_STRIDE, h->mb.pic.p_fenc[1]-1, FENC_STRIDE, height );
        h->mc.copy[PIXEL_8x8]( h->mb.pic.p_fdec[2], FDEC_STRIDE, h->mb.pic.p_fenc[2]-1, FENC_STRIDE, height );
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        x264_copy_column8( h->mb.pic.p_fdec[1]+4*FDEC_STRIDE, h->mb.pic.p_fdec[1]+4*FDEC_STRIDE-1 );
        x264_copy_column8( h->mb.pic.p_fdec[2]+4*FDEC_STRIDE, h->mb.pic.p_fdec[2]+4*FDEC_STRIDE-1 );
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        if( CHROMA_FORMAT == CHROMA_422 )
        {
            x264_copy_column8( h->mb.pic.p_fdec[1]+12*FDEC_STRIDE, h->mb.pic.p_fdec[1]+12*FDEC_STRIDE-1 );
            x264_copy_column8( h->mb.pic.p_fdec[2]+12*FDEC_STRIDE, h->mb.pic.p_fdec[2]+12*FDEC_STRIDE-1 );
        }
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    }
    else
    {
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        h->predict_chroma[i_mode]( h->mb.pic.p_fdec[1] );
        h->predict_chroma[i_mode]( h->mb.pic.p_fdec[2] );
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    }
}

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void x264_predict_lossless_4x4( x264_t *h, pixel *p_dst, int p, int idx, int i_mode )
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{
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    int stride = h->fenc->i_stride[p] << MB_INTERLACED;
    pixel *p_src = h->mb.pic.p_fenc_plane[p] + block_idx_x[idx]*4 + block_idx_y[idx]*4 * stride;
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    if( i_mode == I_PRED_4x4_V )
        h->mc.copy[PIXEL_4x4]( p_dst, FDEC_STRIDE, p_src-stride, stride, 4 );
    else if( i_mode == I_PRED_4x4_H )
        h->mc.copy[PIXEL_4x4]( p_dst, FDEC_STRIDE, p_src-1, stride, 4 );
    else
        h->predict_4x4[i_mode]( p_dst );
}

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void x264_predict_lossless_8x8( x264_t *h, pixel *p_dst, int p, int idx, int i_mode, pixel edge[36] )
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{
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    int stride = h->fenc->i_stride[p] << MB_INTERLACED;
    pixel *p_src = h->mb.pic.p_fenc_plane[p] + (idx&1)*8 + (idx>>1)*8*stride;
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    if( i_mode == I_PRED_8x8_V )
        h->mc.copy[PIXEL_8x8]( p_dst, FDEC_STRIDE, p_src-stride, stride, 8 );
    else if( i_mode == I_PRED_8x8_H )
        h->mc.copy[PIXEL_8x8]( p_dst, FDEC_STRIDE, p_src-1, stride, 8 );
    else
        h->predict_8x8[i_mode]( p_dst, edge );
}

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void x264_predict_lossless_16x16( x264_t *h, int p, int i_mode )
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{
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    int stride = h->fenc->i_stride[p] << MB_INTERLACED;
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    if( i_mode == I_PRED_16x16_V )
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        h->mc.copy[PIXEL_16x16]( h->mb.pic.p_fdec[p], FDEC_STRIDE, h->mb.pic.p_fenc_plane[p]-stride, stride, 16 );
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    else if( i_mode == I_PRED_16x16_H )
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        h->mc.copy_16x16_unaligned( h->mb.pic.p_fdec[p], FDEC_STRIDE, h->mb.pic.p_fenc_plane[p]-1, stride, 16 );
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    else
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        h->predict_16x16[i_mode]( h->mb.pic.p_fdec[p] );
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}

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/*****************************************************************************
 * x264_macroblock_encode:
 *****************************************************************************/
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static ALWAYS_INLINE void x264_macroblock_encode_internal( x264_t *h, int plane_count, int chroma )
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{
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    int i_qp = h->mb.i_qp;
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    int b_decimate = h->mb.b_dct_decimate;
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    int b_force_no_skip = 0;
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    int nz;
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    h->mb.i_cbp_luma = 0;
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    for( int p = 0; p < plane_count; p++ )
        h->mb.cache.non_zero_count[x264_scan8[LUMA_DC+p]] = 0;
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    if( h->mb.i_type == I_PCM )
    {
        /* if PCM is chosen, we need to store reconstructed frame data */
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        for( int p = 0; p < plane_count; p++ )
            h->mc.copy[PIXEL_16x16]( h->mb.pic.p_fdec[p], FDEC_STRIDE, h->mb.pic.p_fenc[p], FENC_STRIDE, 16 );
        if( chroma )
        {
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            int height = 16 >> CHROMA_V_SHIFT;
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            h->mc.copy[PIXEL_8x8]  ( h->mb.pic.p_fdec[1], FDEC_STRIDE, h->mb.pic.p_fenc[1], FENC_STRIDE, height );
            h->mc.copy[PIXEL_8x8]  ( h->mb.pic.p_fdec[2], FDEC_STRIDE, h->mb.pic.p_fenc[2], FENC_STRIDE, height );
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        }
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        return;
    }

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    if( !h->mb.b_allow_skip )
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    {
        b_force_no_skip = 1;
        if( IS_SKIP(h->mb.i_type) )
        {
            if( h->mb.i_type == P_SKIP )
                h->mb.i_type = P_L0;
            else if( h->mb.i_type == B_SKIP )
                h->mb.i_type = B_DIRECT;
        }
    }

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    if( h->mb.i_type == P_SKIP )
    {
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        /* don't do pskip motion compensation if it was already done in macroblock_analyse */
        if( !h->mb.b_skip_mc )
        {
            int mvx = x264_clip3( h->mb.cache.mv[0][x264_scan8[0]][0],
                                  h->mb.mv_min[0], h->mb.mv_max[0] );
            int mvy = x264_clip3( h->mb.cache.mv[0][x264_scan8[0]][1],
                                  h->mb.mv_min[1], h->mb.mv_max[1] );

            for( int p = 0; p < plane_count; p++ )
                h->mc.mc_luma( h->mb.pic.p_fdec[p], FDEC_STRIDE,
                               &h->mb.pic.p_fref[0][0][p*4], h->mb.pic.i_stride[p],
                               mvx, mvy, 16, 16, &h->sh.weight[0][p] );

            if( chroma )
            {
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                int v_shift = CHROMA_V_SHIFT;
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                int height = 16 >> v_shift;

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                /* Special case for mv0, which is (of course) very common in P-skip mode. */
                if( mvx | mvy )
                    h->mc.mc_chroma( h->mb.pic.p_fdec[1], h->mb.pic.p_fdec[2], FDEC_STRIDE,
                                     h->mb.pic.p_fref[0][0][4], h->mb.pic.i_stride[1],
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                                     mvx, 2*mvy>>v_shift, 8, height );
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                else
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                    h->mc.load_deinterleave_chroma_fdec( h->mb.pic.p_fdec[1], h->mb.pic.p_fref[0][0][4],
                                                         h->mb.pic.i_stride[1], height );
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                if( h->sh.weight[0][1].weightfn )
                    h->sh.weight[0][1].weightfn[8>>2]( h->mb.pic.p_fdec[1], FDEC_STRIDE,
                                                       h->mb.pic.p_fdec[1], FDEC_STRIDE,
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                                                       &h->sh.weight[0][1], height );
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                if( h->sh.weight[0][2].weightfn )
                    h->sh.weight[0][2].weightfn[8>>2]( h->mb.pic.p_fdec[2], FDEC_STRIDE,
                                                       h->mb.pic.p_fdec[2], FDEC_STRIDE,
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                                                       &h->sh.weight[0][2], height );
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            }
        }

        x264_macroblock_encode_skip( h );
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        return;
    }
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    if( h->mb.i_type == B_SKIP )
    {
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        /* don't do bskip motion compensation if it was already done in macroblock_analyse */
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        if( !h->mb.b_skip_mc )
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            x264_mb_mc( h );
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        x264_macroblock_encode_skip( h );
        return;
    }
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    if( h->mb.i_type == I_16x16 )
    {
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        h->mb.b_transform_8x8 = 0;
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        for( int p = 0; p < plane_count; p++, i_qp = h->mb.i_chroma_qp )
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            x264_mb_encode_i16x16( h, p, i_qp );
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    }
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    else if( h->mb.i_type == I_8x8 )
    {
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        h->mb.b_transform_8x8 = 1;
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        /* If we already encoded 3 of the 4 i8x8 blocks, we don't have to do them again. */
        if( h->mb.i_skip_intra )
        {
            h->mc.copy[PIXEL_16x16]( h->mb.pic.p_fdec[0], FDEC_STRIDE, h->mb.pic.i8x8_fdec_buf, 16, 16 );
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            M32( &h->mb.cache.non_zero_count[x264_scan8[ 0]] ) = h->mb.pic.i8x8_nnz_buf[0];
            M32( &h->mb.cache.non_zero_count[x264_scan8[ 2]] ) = h->mb.pic.i8x8_nnz_buf[1];
            M32( &h->mb.cache.non_zero_count[x264_scan8[ 8]] ) = h->mb.pic.i8x8_nnz_buf[2];
            M32( &h->mb.cache.non_zero_count[x264_scan8[10]] ) = h->mb.pic.i8x8_nnz_buf[3];
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            h->mb.i_cbp_luma = h->mb.pic.i8x8_cbp;
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            /* In RD mode, restore the now-overwritten DCT data. */
            if( h->mb.i_skip_intra == 2 )
                h->mc.memcpy_aligned( h->dct.luma8x8, h->mb.pic.i8x8_dct_buf, sizeof(h->mb.pic.i8x8_dct_buf) );
        }
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        for( int p = 0; p < plane_count; p++, i_qp = h->mb.i_chroma_qp )
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        {
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            for( int i = (p == 0 && h->mb.i_skip_intra) ? 3 : 0; i < 4; i++ )
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            {
                int i_mode = h->mb.cache.intra4x4_pred_mode[x264_scan8[4*i]];
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                x264_mb_encode_i8x8( h, p, i, i_qp, i_mode, NULL, 1 );
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            }
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        }
    }
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    else if( h->mb.i_type == I_4x4 )
    {
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        h->mb.b_transform_8x8 = 0;
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        /* If we already encoded 15 of the 16 i4x4 blocks, we don't have to do them again. */
        if( h->mb.i_skip_intra )
        {
            h->mc.copy[PIXEL_16x16]( h->mb.pic.p_fdec[0], FDEC_STRIDE, h->mb.pic.i4x4_fdec_buf, 16, 16 );
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            M32( &h->mb.cache.non_zero_count[x264_scan8[ 0]] ) = h->mb.pic.i4x4_nnz_buf[0];
            M32( &h->mb.cache.non_zero_count[x264_scan8[ 2]] ) = h->mb.pic.i4x4_nnz_buf[1];
            M32( &h->mb.cache.non_zero_count[x264_scan8[ 8]] ) = h->mb.pic.i4x4_nnz_buf[2];
            M32( &h->mb.cache.non_zero_count[x264_scan8[10]] ) = h->mb.pic.i4x4_nnz_buf[3];
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            h->mb.i_cbp_luma = h->mb.pic.i4x4_cbp;
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            /* In RD mode, restore the now-overwritten DCT data. */
            if( h->mb.i_skip_intra == 2 )
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                h->mc.memcpy_aligned( h->dct.luma4x4, h->mb.pic.i4x4_dct_buf, sizeof(h->mb.pic.i4x4_dct_buf) );
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        }
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        for( int p = 0; p < plane_count; p++, i_qp = h->mb.i_chroma_qp )
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        {
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            for( int i = (p == 0 && h->mb.i_skip_intra) ? 15 : 0; i < 16; i++ )
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            {
                pixel *p_dst = &h->mb.pic.p_fdec[p][block_idx_xy_fdec[i]];
                int i_mode = h->mb.cache.intra4x4_pred_mode[x264_scan8[i]];
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                if( (h->mb.i_neighbour4[i] & (MB_TOPRIGHT|MB_TOP)) == MB_TOP )
                    /* emulate missing topright samples */
                    MPIXEL_X4( &p_dst[4-FDEC_STRIDE] ) = PIXEL_SPLAT_X4( p_dst[3-FDEC_STRIDE] );
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                x264_mb_encode_i4x4( h, p, i, i_qp, i_mode, 1 );
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            }
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        }
    }
    else    /* Inter MB */
    {
        int i_decimate_mb = 0;

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        /* Don't repeat motion compensation if it was already done in non-RD transform analysis */
        if( !h->mb.b_skip_mc )
            x264_mb_mc( h );
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        if( h->mb.b_lossless )
        {
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            if( h->mb.b_transform_8x8 )
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                for( int p = 0; p < plane_count; p++ )
                    for( int i8x8 = 0; i8x8 < 4; i8x8++ )
                    {
                        int x = i8x8&1;
                        int y = i8x8>>1;
                        nz = h->zigzagf.sub_8x8( h->dct.luma8x8[p*4+i8x8], h->mb.pic.p_fenc[p] + 8*x + 8*y*FENC_STRIDE,
                                                                           h->mb.pic.p_fdec[p] + 8*x + 8*y*FDEC_STRIDE );
                        STORE_8x8_NNZ( p, i8x8, nz );
                        h->mb.i_cbp_luma |= nz << i8x8;
                    }
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            else
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                for( int p = 0; p < plane_count; p++ )
                    for( int i4x4 = 0; i4x4 < 16; i4x4++ )
                    {
                        nz = h->zigzagf.sub_4x4( h->dct.luma4x4[p*16+i4x4],
                                                 h->mb.pic.p_fenc[p]+block_idx_xy_fenc[i4x4],
                                                 h->mb.pic.p_fdec[p]+block_idx_xy_fdec[i4x4] );
                        h->mb.cache.non_zero_count[x264_scan8[p*16+i4x4]] = nz;
                        h->mb.i_cbp_luma |= nz << (i4x4>>2);
                    }
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        }
        else if( h->mb.b_transform_8x8 )
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        {
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            ALIGNED_ARRAY_N( dctcoef, dct8x8,[4],[64] );
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            b_decimate &= !h->mb.b_trellis || !h->param.b_cabac; // 8x8 trellis is inherently optimal decimation for CABAC
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            for( int p = 0; p < plane_count; p++, i_qp = h->mb.i_chroma_qp )
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            {
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                int quant_cat = p ? CQM_8PC : CQM_8PY;
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                CLEAR_16x16_NNZ( p );
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                h->dctf.sub16x16_dct8( dct8x8, h->mb.pic.p_fenc[p], h->mb.pic.p_fdec[p] );
                h->nr_count[1+!!p*2] += h->mb.b_noise_reduction * 4;
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                int plane_cbp = 0;
                for( int idx = 0; idx < 4; idx++ )
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                {
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                    nz = x264_quant_8x8( h, dct8x8[idx], i_qp, ctx_cat_plane[DCT_LUMA_8x8][p], 0, p, idx );

                    if( nz )
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                    {
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                        h->zigzagf.scan_8x8( h->dct.luma8x8[p*4+idx], dct8x8[idx] );
                        if( b_decimate )
                        {
                            int i_decimate_8x8 = h->quantf.decimate_score64( h->dct.luma8x8[p*4+idx] );
                            i_decimate_mb += i_decimate_8x8;
                            if( i_decimate_8x8 >= 4 )
                                plane_cbp |= 1<<idx;
                        }
                        else
                            plane_cbp |= 1<<idx;
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                    }
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                }
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                if( i_decimate_mb >= 6 || !b_decimate )
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                {
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                    h->mb.i_cbp_luma |= plane_cbp;
                    FOREACH_BIT( idx, 0, plane_cbp )
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                    {
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                        h->quantf.dequant_8x8( dct8x8[idx], h->dequant8_mf[quant_cat], i_qp );
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                        h->dctf.add8x8_idct8( &h->mb.pic.p_fdec[p][8*(idx&1) + 8*(idx>>1)*FDEC_STRIDE], dct8x8[idx] );
                        STORE_8x8_NNZ( p, idx, 1 );
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                    }
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                }
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            }
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        }
        else
        {
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            ALIGNED_ARRAY_N( dctcoef, dct4x4,[16],[16] );
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            for( int p = 0; p < plane_count; p++, i_qp = h->mb.i_chroma_qp )
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            {
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                int quant_cat = p ? CQM_4PC : CQM_4PY;
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                CLEAR_16x16_NNZ( p );
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                h->dctf.sub16x16_dct( dct4x4, h->mb.pic.p_fenc[p], h->mb.pic.p_fdec[p] );
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                if( h->mb.b_noise_reduction )
                {
                    h->nr_count[0+!!p*2] += 16;
                    for( int idx = 0; idx < 16; idx++ )
                        h->quantf.denoise_dct( dct4x4[idx], h->nr_residual_sum[0+!!p*2], h->nr_offset[0+!!p*2], 16 );
                }
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                int plane_cbp = 0;
                for( int i8x8 = 0; i8x8 < 4; i8x8++ )
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                {
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                    int i_decimate_8x8 = b_decimate ? 0 : 6;
                    int nnz8x8 = 0;
                    if( h->mb.b_trellis )
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                    {
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                        for( int i4x4 = 0; i4x4 < 4; i4x4++ )
                        {
                            int idx = i8x8*4+i4x4;
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                            if( x264_quant_4x4_trellis( h, dct4x4[idx], quant_cat, i_qp, ctx_cat_plane[DCT_LUMA_4x4][p], 0, !!p, p*16+idx ) )
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                            {
                                h->zigzagf.scan_4x4( h->dct.luma4x4[p*16+idx], dct4x4[idx] );
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                                h->quantf.dequant_4x4( dct4x4[idx], h->dequant4_mf[quant_cat], i_qp );
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                                if( i_decimate_8x8 < 6 )
                                    i_decimate_8x8 += h->quantf.decimate_score16( h->dct.luma4x4[p*16+idx] );
                                h->mb.cache.non_zero_count[x264_scan8[p*16+idx]] = 1;
                                nnz8x8 = 1;
                            }
                        }
                    }
                    else
                    {
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                        nnz8x8 = nz = h->quantf.quant_4x4x4( &dct4x4[i8x8*4], h->quant4_mf[quant_cat][i_qp], h->quant4_bias[quant_cat][i_qp] );
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                        if( nz )
                        {
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                            FOREACH_BIT( idx, i8x8*4, nz )
                            {
                                h->zigzagf.scan_4x4( h->dct.luma4x4[p*16+idx], dct4x4[idx] );
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                                h->quantf.dequant_4x4( dct4x4[idx], h->dequant4_mf[quant_cat], i_qp );
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                                if( i_decimate_8x8 < 6 )
                                    i_decimate_8x8 += h->quantf.decimate_score16( h->dct.luma4x4[p*16+idx] );
                                h->mb.cache.non_zero_count[x264_scan8[p*16+idx]] = 1;
                            }
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                        }
                    }
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                    if( nnz8x8 )
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                    {
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                        i_decimate_mb += i_decimate_8x8;
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                        if( i_decimate_8x8 < 4 )
                            STORE_8x8_NNZ( p, i8x8, 0 );
                        else
                            plane_cbp |= 1<<i8x8;
                    }
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                }

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                if( i_decimate_mb < 6 )
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                {
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                    plane_cbp = 0;
                    CLEAR_16x16_NNZ( p );
                }
                else
                {
                    h->mb.i_cbp_luma |= plane_cbp;
                    FOREACH_BIT( i8x8, 0, plane_cbp )
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                    {
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                        h->dctf.add8x8_idct( &h->mb.pic.p_fdec[p][(i8x8&1)*8 + (i8x8>>1)*8*FDEC_STRIDE], &dct4x4[i8x8*4] );
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                    }
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                }
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            }
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        }
    }

    /* encode chroma */
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    if( chroma )
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    {
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        if( IS_INTRA( h->mb.i_type ) )
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        {
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            int i_mode = h->mb.i_chroma_pred_mode;
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            if( h->mb.b_lossless )
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                x264_predict_lossless_chroma( h, i_mode );
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            else
            {
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                h->predict_chroma[i_mode]( h->mb.pic.p_fdec[1] );
                h->predict_chroma[i_mode]( h->mb.pic.p_fdec[2] );
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            }
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        }
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        /* encode the 8x8 blocks */
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        x264_mb_encode_chroma( h, !IS_INTRA( h->mb.i_type ), h->mb.i_chroma_qp );
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    }
    else
        h->mb.i_cbp_chroma = 0;
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    /* store cbp */
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    int cbp = h->mb.i_cbp_chroma << 4 | h->mb.i_cbp_luma;
    if( h->param.b_cabac )
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        cbp |= h->mb.cache.non_zero_count[x264_scan8[LUMA_DC    ]] << 8
            |  h->mb.cache.non_zero_count[x264_scan8[CHROMA_DC+0]] << 9
            |  h->mb.cache.non_zero_count[x264_scan8[CHROMA_DC+1]] << 10;
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    h->mb.cbp[h->mb.i_mb_xy] = cbp;
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    /* Check for P_SKIP
     * XXX: in the me perhaps we should take x264_mb_predict_mv_pskip into account
     *      (if multiple mv give same result)*/
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    if( !b_force_no_skip )
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    {
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        if( h->mb.i_type == P_L0 && h->mb.i_partition == D_16x16 &&
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            !(h->mb.i_cbp_luma | h->mb.i_cbp_chroma) &&
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            M32( h->mb.cache.mv[0][x264_scan8[0]] ) == M32( h->mb.cache.pskip_mv )
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            && h->mb.cache.ref[0][x264_scan8[0]] == 0 )
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        {
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            h->mb.i_type = P_SKIP;
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        }
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        /* Check for B_SKIP */
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        if( h->mb.i_type == B_DIRECT && !(h->mb.i_cbp_luma | h->mb.i_cbp_chroma) )
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        {
            h->mb.i_type = B_SKIP;
        }
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    }
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}

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void x264_macroblock_encode( x264_t *h )
{
    if( CHROMA444 )
        x264_macroblock_encode_internal( h, 3, 0 );
    else
        x264_macroblock_encode_internal( h, 1, 1 );
}

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/*****************************************************************************
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 * x264_macroblock_probe_skip:
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 *  Check if the current MB could be encoded as a [PB]_SKIP
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 *****************************************************************************/
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static ALWAYS_INLINE int x264_macroblock_probe_skip_internal( x264_t *h, int b_bidir, int plane_count, int chroma )
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{
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    ALIGNED_ARRAY_N( dctcoef, dct4x4,[8],[16] );
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    ALIGNED_ARRAY_16( dctcoef, dctscan,[16] );
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    ALIGNED_4( int16_t mvp[2] );
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    int i_qp = h->mb.i_qp;
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    for( int p = 0; p < plane_count; p++, i_qp = h->mb.i_chroma_qp )
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    {
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        int quant_cat = p ? CQM_4PC : CQM_4PY;
        if( !b_bidir )
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        {
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            /* Get the MV */
            mvp[0] = x264_clip3( h->mb.cache.pskip_mv[0], h->mb.mv_min[0], h->mb.mv_max[0] );
            mvp[1] = x264_clip3( h->mb.cache.pskip_mv[1], h->mb.mv_min[1], h->mb.mv_max[1] );

            /* Motion compensation */
            h->mc.mc_luma( h->mb.pic.p_fdec[p],    FDEC_STRIDE,
                           &h->mb.pic.p_fref[0][0][p*4], h->mb.pic.i_stride[p],
                           mvp[0], mvp[1], 16, 16, &h->sh.weight[0][p] );
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        }

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        for( int i8x8 = 0, i_decimate_mb = 0; i8x8 < 4; i8x8++ )
        {
            int fenc_offset = (i8x8&1) * 8 + (i8x8>>1) * FENC_STRIDE * 8;
            int fdec_offset = (i8x8&1) * 8 + (i8x8>>1) * FDEC_STRIDE * 8;
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            h->dctf.sub8x8_dct( dct4x4, h->mb.pic.p_fenc[p] + fenc_offset,
                                        h->mb.pic.p_fdec[p] + fdec_offset );
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            if( h->mb.b_noise_reduction )
                for( int i4x4 = 0; i4x4 < 4; i4x4++ )
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                    h->quantf.denoise_dct( dct4x4[i4x4], h->nr_residual_sum[0+!!p*2], h->nr_offset[0+!!p*2], 16 );
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            int nz = h->quantf.quant_4x4x4( dct4x4, h->quant4_mf[quant_cat][i_qp], h->quant4_bias[quant_cat][i_qp] );
            FOREACH_BIT( idx, 0, nz )
            {
                h->zigzagf.scan_4x4( dctscan, dct4x4[idx] );
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                i_decimate_mb += h->quantf.decimate_score16( dctscan );
                if( i_decimate_mb >= 6 )
                    return 0;
            }
        }
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    }

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    if( chroma == CHROMA_420 || chroma == CHROMA_422 )
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    {
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        i_qp = h->mb.i_chroma_qp;
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        int chroma422 = chroma == CHROMA_422;
        int thresh = chroma422 ? (x264_lambda2_tab[i_qp] + 16) >> 5 : (x264_lambda2_tab[i_qp] + 32) >> 6;
        int ssd;
        ALIGNED_ARRAY_16( dctcoef, dct_dc,[8] );
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        if( !b_bidir )
        {
            /* Special case for mv0, which is (of course) very common in P-skip mode. */
            if( M32( mvp ) )
                h->mc.mc_chroma( h->mb.pic.p_fdec[1], h->mb.pic.p_fdec[2], FDEC_STRIDE,
                                 h->mb.pic.p_fref[0][0][4], h->mb.pic.i_stride[1],
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                                 mvp[0], mvp[1]<<chroma422, 8, chroma422?16:8 );
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            else
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                h->mc.load_deinterleave_chroma_fdec( h->mb.pic.p_fdec[1], h->mb.pic.p_fref[0][0][4],
                                                     h->mb.pic.i_stride[1], chroma422?16:8 );
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        }
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        for( int ch = 0; ch < 2; ch++ )
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        {
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            pixel *p_src = h->mb.pic.p_fenc[1+ch];
            pixel *p_dst = h->mb.pic.p_fdec[1+ch];

            if( !b_bidir && h->sh.weight[0][1+ch].weightfn )
                h->sh.weight[0][1+ch].weightfn[8>>2]( h->mb.pic.p_fdec[1+ch], FDEC_STRIDE,
                                                      h->mb.pic.p_fdec[1+ch], FDEC_STRIDE,
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                                                      &h->sh.weight[0][1+ch], chroma422?16:8 );
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            /* there is almost never a termination during chroma, but we can't avoid the check entirely */
            /* so instead we check SSD and skip the actual check if the score is low enough. */
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            ssd = h->pixf.ssd[chroma422?PIXEL_8x16:PIXEL_8x8]( p_dst, FDEC_STRIDE, p_src, FENC_STRIDE );
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            if( ssd < thresh )
                continue;

            /* The vast majority of chroma checks will terminate during the DC check or the higher
             * threshold check, so we can save time by doing a DC-only DCT. */
            if( h->mb.b_noise_reduction )
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            {
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                for( int i = 0; i <= chroma422; i++ )
                    h->dctf.sub8x8_dct( &dct4x4[4*i], p_src + 8*i*FENC_STRIDE, p_dst + 8*i*FDEC_STRIDE );

                for( int i4x4 = 0; i4x4 < (chroma422?8:4); i4x4++ )
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                {
                    h->quantf.denoise_dct( dct4x4[i4x4], h->nr_residual_sum[2], h->nr_offset[2], 16 );
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                    dct_dc[i4x4] = dct4x4[i4x4][0];
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                    dct4x4[i4x4][0] = 0;
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                }
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            }
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            else
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            {
                if( chroma422 )
                    h->dctf.sub8x16_dct_dc( dct_dc, p_src, p_dst );
                else
                    h->dctf.sub8x8_dct_dc( dct_dc, p_src, p_dst );
            }
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            for( int i = 0; i <= chroma422; i++ )
                if( h->quantf.quant_2x2_dc( &dct_dc[4*i], h->quant4_mf[CQM_4PC][i_qp+3*chroma422][0] >> 1,
                                            h->quant4_bias[CQM_4PC][i_qp+3*chroma422][0] << 1 ) )
                    return 0;
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            /* If there wasn't a termination in DC, we can check against a much higher threshold. */
            if( ssd < thresh*4 )
                continue;
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            if( !h->mb.b_noise_reduction )
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                for( int i = 0; i <= chroma422; i++ )
                {
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                    h->dctf.sub8x8_dct( &dct4x4[4*i], p_src + 8*i*FENC_STRIDE, p_dst + 8*i*FDEC_STRIDE );
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                    dct4x4[i*4+0][0] = 0