rdopt.c 89.8 KB
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/*
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 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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 *
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 *  Use of this source code is governed by a BSD-style license
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 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
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 *  in the file PATENTS.  All contributing project authors may
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 *  be found in the AUTHORS file in the root of the source tree.
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 */


#include <stdio.h>
#include <math.h>
#include <limits.h>
#include <assert.h>
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#include "vp8/common/pragmas.h"
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#include "tokenize.h"
#include "treewriter.h"
#include "onyx_int.h"
#include "modecosts.h"
#include "encodeintra.h"
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#include "vp8/common/entropymode.h"
#include "vp8/common/reconinter.h"
#include "vp8/common/reconintra.h"
#include "vp8/common/reconintra4x4.h"
#include "vp8/common/findnearmv.h"
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#include "encodemb.h"
#include "quantize.h"
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#include "vp8/common/idct.h"
#include "vp8/common/g_common.h"
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#include "variance.h"
#include "mcomp.h"
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#include "rdopt.h"
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#include "vpx_mem/vpx_mem.h"
#include "dct.h"
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#include "vp8/common/systemdependent.h"
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//#if CONFIG_SEGFEATURES
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#include "vp8/common/seg_common.h"

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#if CONFIG_RUNTIME_CPU_DETECT
#define IF_RTCD(x)  (x)
#else
#define IF_RTCD(x)  NULL
#endif


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extern void vp8cx_mb_init_quantizer(VP8_COMP *cpi, MACROBLOCK *x);
extern void vp8_update_zbin_extra(VP8_COMP *cpi, MACROBLOCK *x);

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#define MAXF(a,b)            (((a) > (b)) ? (a) : (b))

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static const int auto_speed_thresh[17] =
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{
    1000,
    200,
    150,
    130,
    150,
    125,
    120,
    115,
    115,
    115,
    115,
    115,
    115,
    115,
    115,
    115,
    105
};

const MB_PREDICTION_MODE vp8_mode_order[MAX_MODES] =
{
    ZEROMV,
    DC_PRED,

    NEARESTMV,
    NEARMV,

    ZEROMV,
    NEARESTMV,

    ZEROMV,
    NEARESTMV,

    NEARMV,
    NEARMV,

    V_PRED,
    H_PRED,
    TM_PRED,

    NEWMV,
    NEWMV,
    NEWMV,

    SPLITMV,
    SPLITMV,
    SPLITMV,

    B_PRED,
};

const MV_REFERENCE_FRAME vp8_ref_frame_order[MAX_MODES] =
{
    LAST_FRAME,
    INTRA_FRAME,

    LAST_FRAME,
    LAST_FRAME,

    GOLDEN_FRAME,
    GOLDEN_FRAME,

    ALTREF_FRAME,
    ALTREF_FRAME,

    GOLDEN_FRAME,
    ALTREF_FRAME,

    INTRA_FRAME,
    INTRA_FRAME,
    INTRA_FRAME,

    LAST_FRAME,
    GOLDEN_FRAME,
    ALTREF_FRAME,

    LAST_FRAME,
    GOLDEN_FRAME,
    ALTREF_FRAME,

    INTRA_FRAME,
};

static void fill_token_costs(
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    unsigned int c      [BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] [MAX_ENTROPY_TOKENS],
    const vp8_prob p    [BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] [ENTROPY_NODES]
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)
{
    int i, j, k;


    for (i = 0; i < BLOCK_TYPES; i++)
        for (j = 0; j < COEF_BANDS; j++)
            for (k = 0; k < PREV_COEF_CONTEXTS; k++)

                vp8_cost_tokens((int *)(c [i][j][k]), p [i][j][k], vp8_coef_tree);

}

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static int rd_iifactor [ 32 ] =  {    4,   4,   3,   2,   1,   0,   0,   0,
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                                      0,   0,   0,   0,   0,   0,   0,   0,
                                      0,   0,   0,   0,   0,   0,   0,   0,
                                      0,   0,   0,   0,   0,   0,   0,   0,
                                 };

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// 3* dc_qlookup[Q]*dc_qlookup[Q];
#if !CONFIG_EXTEND_QRANGE
static int rdmult_lut[QINDEX_RANGE]=
{
    48,75,108,147,192,243,300,300,
    363,432,507,588,675,768,867,867,
    972,1083,1200,1200,1323,1323,1452,1452,
    1587,1587,1728,1875,1875,2028,2187,2352,
    2523,2700,2883,3072,3267,3468,3675,3888,
    4107,4107,4332,4563,4800,5043,5292,5547,
    5808,6075,6348,6348,6627,6912,7203,7500,
    7803,8112,8427,8748,9075,9408,9747,10092,
    10443,10800,11163,11532,11907,12288,12675,13068,
    13467,13872,14283,14700,15123,15552,15987,16428,
    16875,17328,17328,17787,18252,18723,19200,19683,
    20172,20667,21168,21675,22188,22707,23232,23763,
    24843,25947,27075,27648,28812,30000,30603,31212,
    32448,33708,34992,36300,37632,38988,40368,41772,
    44652,46128,47628,49152,50700,52272,53868,55488,
    57132,58800,61347,63075,65712,68403,71148,73947,
};
#else
static int rdmult_lut[QINDEX_RANGE]=
{
    3,5,7,9,12,15,19,23,
    27,32,37,42,48,54,61,68,
    75,83,91,99,108,117,127,137,
    147,169,192,217,243,271,300,331,
    363,397,450,507,567,631,698,768,
    842,919,999,1083,1170,1261,1355,1452,
    1587,1728,1875,2028,2187,2352,2523,2700,
    2883,3072,3267,3468,3675,3888,4107,4332,
    4563,4800,5043,5292,5547,5808,6075,6348,
    6627,6912,7203,7500,7880,8269,8667,9075,
    9492,9919,10355,10800,11255,11719,12192,12675,
    13167,13669,14180,14700,15230,15769,16317,16875,
    18019,19200,20419,21675,22969,24300,25669,27075,
    28519,30000,31519,33075,34669,36300,37969,39675,
    41772,43923,46128,48387,50700,53067,55488,57963,
    61347,64827,69312,73947,78732,83667,89787,97200,
};
#endif
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/* values are now correlated to quantizer */
static int sad_per_bit16lut[QINDEX_RANGE] =
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{
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    2,  2,  2,  2,  2,  2,  2,  2,
    2,  2,  2,  2,  2,  2,  2,  2,
    3,  3,  3,  3,  3,  3,  3,  3,
    3,  3,  3,  3,  3,  3,  4,  4,
    4,  4,  4,  4,  4,  4,  4,  4,
    4,  4,  5,  5,  5,  5,  5,  5,
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    5,  5,  5,  5,  5,  5,  6,  6,
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    6,  6,  6,  6,  6,  6,  6,  6,
    6,  6,  7,  7,  7,  7,  7,  7,
    7,  7,  7,  7,  7,  7,  8,  8,
    8,  8,  8,  8,  8,  8,  8,  8,
    8,  8,  9,  9,  9,  9,  9,  9,
    9,  9,  9,  9,  9,  9,  10, 10,
    10, 10, 10, 10, 10, 10, 11, 11,
    11, 11, 11, 11, 12, 12, 12, 12,
    12, 12, 13, 13, 13, 13, 14, 14
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};
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static int sad_per_bit4lut[QINDEX_RANGE] =
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{
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    2,  2,  2,  2,  2,  2,  3,  3,
    3,  3,  3,  3,  3,  3,  3,  3,
    3,  3,  3,  3,  4,  4,  4,  4,
    4,  4,  4,  4,  4,  4,  5,  5,
    5,  5,  5,  5,  6,  6,  6,  6,
    6,  6,  6,  6,  6,  6,  6,  6,
    7,  7,  7,  7,  7,  7,  7,  7,
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    7,  7,  7,  7,  7,  8,  8,  8,
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    8,  8,  9,  9,  9,  9,  9,  9,
    10, 10, 10, 10, 10, 10, 10, 10,
    11, 11, 11, 11, 11, 11, 11, 11,
    12, 12, 12, 12, 12, 12, 12, 12,
    13, 13, 13, 13, 13, 13, 13, 14,
    14, 14, 14, 14, 15, 15, 15, 15,
    16, 16, 16, 16, 17, 17, 17, 18,
    18, 18, 19, 19, 19, 20, 20, 20,
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};

void vp8cx_initialize_me_consts(VP8_COMP *cpi, int QIndex)
{
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    cpi->mb.sadperbit16 =  sad_per_bit16lut[QIndex];
    cpi->mb.sadperbit4  =  sad_per_bit4lut[QIndex];
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}

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void vp8_initialize_rd_consts(VP8_COMP *cpi, int QIndex)
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{
    int q;
    int i;

    vp8_clear_system_state();  //__asm emms;

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    // Further tests required to see if optimum is different
    // for key frames, golden frames and arf frames.
    // if (cpi->common.refresh_golden_frame ||
    //     cpi->common.refresh_alt_ref_frame)
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    QIndex=(QIndex<0)? 0 : ((QIndex>127)?127 : QIndex);
    cpi->RDMULT = rdmult_lut[QIndex];
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    // Extend rate multiplier along side quantizer zbin increases
    if (cpi->zbin_over_quant  > 0)
    {
        double oq_factor;

        // Experimental code using the same basic equation as used for Q above
        // The units of cpi->zbin_over_quant are 1/128 of Q bin size
        oq_factor = 1.0 + ((double)0.0015625 * cpi->zbin_over_quant);
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        cpi->RDMULT = (int)((double)cpi->RDMULT * oq_factor * oq_factor);
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    }
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    if (cpi->pass == 2 && (cpi->common.frame_type != KEY_FRAME))
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    {
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        if (cpi->twopass.next_iiratio > 31)
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            cpi->RDMULT += (cpi->RDMULT * rd_iifactor[31]) >> 4;
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        else
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            cpi->RDMULT +=
                (cpi->RDMULT * rd_iifactor[cpi->twopass.next_iiratio]) >> 4;
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    }

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#if !CONFIG_EXTEND_QRANGE
#else
    if (cpi->RDMULT < 7)
        cpi->RDMULT = 7;
#endif
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    cpi->mb.errorperbit = (cpi->RDMULT / 110);
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    cpi->mb.errorperbit += (cpi->mb.errorperbit==0);

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#if CONFIG_EXTEND_QRANGE
    if(cpi->mb.errorperbit<1)
        cpi->mb.errorperbit=1;
#endif
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    vp8_set_speed_features(cpi);

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    q = (int)pow(vp8_dc_quant(QIndex,0), 1.25);
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    if (q < 8)
        q = 8;

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#if CONFIG_EXTEND_QRANGE
    cpi->RDMULT *= 16;
#endif

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    if (cpi->RDMULT > 1000)
    {
        cpi->RDDIV = 1;
        cpi->RDMULT /= 100;

        for (i = 0; i < MAX_MODES; i++)
        {
            if (cpi->sf.thresh_mult[i] < INT_MAX)
            {
                cpi->rd_threshes[i] = cpi->sf.thresh_mult[i] * q / 100;
            }
            else
            {
                cpi->rd_threshes[i] = INT_MAX;
            }

            cpi->rd_baseline_thresh[i] = cpi->rd_threshes[i];
        }
    }
    else
    {
        cpi->RDDIV = 100;

        for (i = 0; i < MAX_MODES; i++)
        {
            if (cpi->sf.thresh_mult[i] < (INT_MAX / q))
            {
                cpi->rd_threshes[i] = cpi->sf.thresh_mult[i] * q;
            }
            else
            {
                cpi->rd_threshes[i] = INT_MAX;
            }

            cpi->rd_baseline_thresh[i] = cpi->rd_threshes[i];
        }
    }

    fill_token_costs(
        cpi->mb.token_costs,
        (const vp8_prob( *)[8][3][11]) cpi->common.fc.coef_probs
    );

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#if CONFIG_QIMODE
    //rough estimate for costing
    cpi->common.kf_ymode_probs_index = cpi->common.base_qindex>>4;
#endif
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    vp8_init_mode_costs(cpi);

}

void vp8_auto_select_speed(VP8_COMP *cpi)
{
    int milliseconds_for_compress = (int)(1000000 / cpi->oxcf.frame_rate);

    milliseconds_for_compress = milliseconds_for_compress * (16 - cpi->oxcf.cpu_used) / 16;

#if 0

    if (0)
    {
        FILE *f;

        f = fopen("speed.stt", "a");
        fprintf(f, " %8ld %10ld %10ld %10ld\n",
                cpi->common.current_video_frame, cpi->Speed, milliseconds_for_compress, cpi->avg_pick_mode_time);
        fclose(f);
    }

#endif

    /*
    // this is done during parameter valid check
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    if( cpi->oxcf.cpu_used > 16)
        cpi->oxcf.cpu_used = 16;
    if( cpi->oxcf.cpu_used < -16)
        cpi->oxcf.cpu_used = -16;
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    */

    if (cpi->avg_pick_mode_time < milliseconds_for_compress && (cpi->avg_encode_time - cpi->avg_pick_mode_time) < milliseconds_for_compress)
    {
        if (cpi->avg_pick_mode_time == 0)
        {
            cpi->Speed = 4;
        }
        else
        {
            if (milliseconds_for_compress * 100 < cpi->avg_encode_time * 95)
            {
                cpi->Speed          += 2;
                cpi->avg_pick_mode_time = 0;
                cpi->avg_encode_time = 0;

                if (cpi->Speed > 16)
                {
                    cpi->Speed = 16;
                }
            }

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            if (milliseconds_for_compress * 100 > cpi->avg_encode_time * auto_speed_thresh[cpi->Speed])
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            {
                cpi->Speed          -= 1;
                cpi->avg_pick_mode_time = 0;
                cpi->avg_encode_time = 0;

                // In real-time mode, cpi->speed is in [4, 16].
                if (cpi->Speed < 4)        //if ( cpi->Speed < 0 )
                {
                    cpi->Speed = 4;        //cpi->Speed = 0;
                }
            }
        }
    }
    else
    {
        cpi->Speed += 4;

        if (cpi->Speed > 16)
            cpi->Speed = 16;


        cpi->avg_pick_mode_time = 0;
        cpi->avg_encode_time = 0;
    }
}

int vp8_block_error_c(short *coeff, short *dqcoeff)
{
    int i;
    int error = 0;

    for (i = 0; i < 16; i++)
    {
        int this_diff = coeff[i] - dqcoeff[i];
        error += this_diff * this_diff;
    }

    return error;
}

int vp8_mbblock_error_c(MACROBLOCK *mb, int dc)
{
    BLOCK  *be;
    BLOCKD *bd;
    int i, j;
    int berror, error = 0;

    for (i = 0; i < 16; i++)
    {
        be = &mb->block[i];
        bd = &mb->e_mbd.block[i];

        berror = 0;

        for (j = dc; j < 16; j++)
        {
            int this_diff = be->coeff[j] - bd->dqcoeff[j];
            berror += this_diff * this_diff;
        }

        error += berror;
    }

    return error;
}

int vp8_mbuverror_c(MACROBLOCK *mb)
{

    BLOCK  *be;
    BLOCKD *bd;


    int i;
    int error = 0;

    for (i = 16; i < 24; i++)
    {
        be = &mb->block[i];
        bd = &mb->e_mbd.block[i];

        error += vp8_block_error_c(be->coeff, bd->dqcoeff);
    }

    return error;
}

int VP8_UVSSE(MACROBLOCK *x, const vp8_variance_rtcd_vtable_t *rtcd)
{
    unsigned char *uptr, *vptr;
    unsigned char *upred_ptr = (*(x->block[16].base_src) + x->block[16].src);
    unsigned char *vpred_ptr = (*(x->block[20].base_src) + x->block[20].src);
    int uv_stride = x->block[16].src_stride;

    unsigned int sse1 = 0;
    unsigned int sse2 = 0;
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    int mv_row = x->e_mbd.mode_info_context->mbmi.mv.as_mv.row;
    int mv_col = x->e_mbd.mode_info_context->mbmi.mv.as_mv.col;
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    int offset;
    int pre_stride = x->e_mbd.block[16].pre_stride;

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    if (mv_row < 0)
        mv_row -= 1;
    else
        mv_row += 1;

    if (mv_col < 0)
        mv_col -= 1;
    else
        mv_col += 1;

    mv_row /= 2;
    mv_col /= 2;
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    offset = (mv_row >> 3) * pre_stride + (mv_col >> 3);
    uptr = x->e_mbd.pre.u_buffer + offset;
    vptr = x->e_mbd.pre.v_buffer + offset;

    if ((mv_row | mv_col) & 7)
    {
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        VARIANCE_INVOKE(rtcd, subpixvar8x8)(uptr, pre_stride,
            mv_col & 7, mv_row & 7, upred_ptr, uv_stride, &sse2);
        VARIANCE_INVOKE(rtcd, subpixvar8x8)(vptr, pre_stride,
            mv_col & 7, mv_row & 7, vpred_ptr, uv_stride, &sse1);
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        sse2 += sse1;
    }
    else
    {
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        VARIANCE_INVOKE(rtcd, var8x8)(uptr, pre_stride,
            upred_ptr, uv_stride, &sse2);
        VARIANCE_INVOKE(rtcd, var8x8)(vptr, pre_stride,
            vpred_ptr, uv_stride, &sse1);
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        sse2 += sse1;
    }
    return sse2;

}

static int cost_coeffs(MACROBLOCK *mb, BLOCKD *b, int type, ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l)
{
    int c = !type;              /* start at coef 0, unless Y with Y2 */
    int eob = b->eob;
    int pt ;    /* surrounding block/prev coef predictor */
    int cost = 0;
    short *qcoeff_ptr = b->qcoeff;

    VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);

# define QC( I)  ( qcoeff_ptr [vp8_default_zig_zag1d[I]] )

    for (; c < eob; c++)
    {
        int v = QC(c);
        int t = vp8_dct_value_tokens_ptr[v].Token;
        cost += mb->token_costs [type] [vp8_coef_bands[c]] [pt] [t];
        cost += vp8_dct_value_cost_ptr[v];
        pt = vp8_prev_token_class[t];
    }

# undef QC

    if (c < 16)
        cost += mb->token_costs [type] [vp8_coef_bands[c]] [pt] [DCT_EOB_TOKEN];

    pt = (c != !type); // is eob first coefficient;
    *a = *l = pt;

    return cost;
}

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static int vp8_rdcost_mby(MACROBLOCK *mb)
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{
    int cost = 0;
    int b;
    MACROBLOCKD *x = &mb->e_mbd;
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    ENTROPY_CONTEXT_PLANES t_above, t_left;
    ENTROPY_CONTEXT *ta;
    ENTROPY_CONTEXT *tl;

    vpx_memcpy(&t_above, mb->e_mbd.above_context, sizeof(ENTROPY_CONTEXT_PLANES));
    vpx_memcpy(&t_left, mb->e_mbd.left_context, sizeof(ENTROPY_CONTEXT_PLANES));
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    ta = (ENTROPY_CONTEXT *)&t_above;
    tl = (ENTROPY_CONTEXT *)&t_left;
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    for (b = 0; b < 16; b++)
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        cost += cost_coeffs(mb, x->block + b, PLANE_TYPE_Y_NO_DC,
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                    ta + vp8_block2above[b], tl + vp8_block2left[b]);
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    cost += cost_coeffs(mb, x->block + 24, PLANE_TYPE_Y2,
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                ta + vp8_block2above[24], tl + vp8_block2left[24]);
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    return cost;
}

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static void macro_block_yrd( MACROBLOCK *mb,
                             int *Rate,
                             int *Distortion,
                             const vp8_encodemb_rtcd_vtable_t *rtcd)
{
    int b;
    MACROBLOCKD *const x = &mb->e_mbd;
    BLOCK   *const mb_y2 = mb->block + 24;
    BLOCKD *const x_y2  = x->block + 24;
    short *Y2DCPtr = mb_y2->src_diff;
    BLOCK *beptr;
    int d;

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    ENCODEMB_INVOKE(rtcd, submby)( mb->src_diff, *(mb->block[0].base_src),
                                   mb->e_mbd.predictor, mb->block[0].src_stride );
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    // Fdct and building the 2nd order block
    for (beptr = mb->block; beptr < mb->block + 16; beptr += 2)
    {
        mb->vp8_short_fdct8x4(beptr->src_diff, beptr->coeff, 32);
        *Y2DCPtr++ = beptr->coeff[0];
        *Y2DCPtr++ = beptr->coeff[16];
    }

    // 2nd order fdct
    mb->short_walsh4x4(mb_y2->src_diff, mb_y2->coeff, 8);

    // Quantization
    for (b = 0; b < 16; b++)
    {
        mb->quantize_b(&mb->block[b], &mb->e_mbd.block[b]);
    }

    // DC predication and Quantization of 2nd Order block
    mb->quantize_b(mb_y2, x_y2);

    // Distortion
    d = ENCODEMB_INVOKE(rtcd, mberr)(mb, 1) << 2;
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#if CONFIG_EXTEND_QRANGE
    d += ENCODEMB_INVOKE(rtcd, berr)(mb_y2->coeff, x_y2->dqcoeff)<<2;
#else
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    d += ENCODEMB_INVOKE(rtcd, berr)(mb_y2->coeff, x_y2->dqcoeff);
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#endif
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    *Distortion = (d >> 4);

    // rate
    *Rate = vp8_rdcost_mby(mb);
}
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static void copy_predictor(unsigned char *dst, const unsigned char *predictor)
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{
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    const unsigned int *p = (const unsigned int *)predictor;
    unsigned int *d = (unsigned int *)dst;
    d[0] = p[0];
    d[4] = p[4];
    d[8] = p[8];
    d[12] = p[12];
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}
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static void copy_predictor_8x8(unsigned char *dst, const unsigned char *predictor)
{
    const unsigned int *p = (const unsigned int *)predictor;
    unsigned int *d = (unsigned int *)dst;
    d[0] = p[0];
    d[1] = p[1];
    d[4] = p[4];
    d[5] = p[5];
    d[8] = p[8];
    d[9] = p[9];
    d[12] = p[12];
    d[13] = p[13];
    d[16] = p[16];
    d[17] = p[17];
    d[20] = p[20];
    d[21] = p[21];
    d[24] = p[24];
    d[25] = p[25];
    d[28] = p[28];
    d[29] = p[29];
}

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static int rd_pick_intra4x4block(
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    VP8_COMP *cpi,
    MACROBLOCK *x,
    BLOCK *be,
    BLOCKD *b,
    B_PREDICTION_MODE *best_mode,
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    unsigned int *bmode_costs,
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    ENTROPY_CONTEXT *a,
    ENTROPY_CONTEXT *l,

    int *bestrate,
    int *bestratey,
    int *bestdistortion)
{
    B_PREDICTION_MODE mode;
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    int best_rd = INT_MAX;
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    int rate = 0;
    int distortion;

    ENTROPY_CONTEXT ta = *a, tempa = *a;
    ENTROPY_CONTEXT tl = *l, templ = *l;
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    /*
     * The predictor buffer is a 2d buffer with a stride of 16.  Create
     * a temp buffer that meets the stride requirements, but we are only
     * interested in the left 4x4 block
     * */
    DECLARE_ALIGNED_ARRAY(16, unsigned char,  best_predictor, 16*4);
    DECLARE_ALIGNED_ARRAY(16, short, best_dqcoeff, 16);
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    for (mode = B_DC_PRED; mode <= B_HU_PRED; mode++)
    {
        int this_rd;
        int ratey;

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        rate = bmode_costs[mode];

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        RECON_INVOKE(&cpi->rtcd.common->recon, intra4x4_predict)
                     (b, mode, b->predictor);
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        ENCODEMB_INVOKE(IF_RTCD(&cpi->rtcd.encodemb), subb)(be, b, 16);
        x->vp8_short_fdct4x4(be->src_diff, be->coeff, 32);
        x->quantize_b(be, b);
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        tempa = ta;
        templ = tl;

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        ratey = cost_coeffs(x, b, PLANE_TYPE_Y_WITH_DC, &tempa, &templ);
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        rate += ratey;
        distortion = ENCODEMB_INVOKE(IF_RTCD(&cpi->rtcd.encodemb), berr)(be->coeff, b->dqcoeff) >> 2;

        this_rd = RDCOST(x->rdmult, x->rddiv, rate, distortion);

        if (this_rd < best_rd)
        {
            *bestrate = rate;
            *bestratey = ratey;
            *bestdistortion = distortion;
            best_rd = this_rd;
            *best_mode = mode;
            *a = tempa;
            *l = templ;
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            copy_predictor(best_predictor, b->predictor);
            vpx_memcpy(best_dqcoeff, b->dqcoeff, 32);
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        }
    }
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    b->bmi.as_mode = (B_PREDICTION_MODE)(*best_mode);
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    IDCT_INVOKE(IF_RTCD(&cpi->rtcd.common->idct), idct16)(best_dqcoeff, b->diff, 32);
    RECON_INVOKE(IF_RTCD(&cpi->rtcd.common->recon), recon)(best_predictor, b->diff, *(b->base_dst) + b->dst, b->dst_stride);
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    return best_rd;
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}

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static int rd_pick_intra4x4mby_modes(VP8_COMP *cpi, MACROBLOCK *mb, int *Rate,
                                     int *rate_y, int *Distortion, int best_rd)
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{
    MACROBLOCKD *const xd = &mb->e_mbd;
    int i;
    int cost = mb->mbmode_cost [xd->frame_type] [B_PRED];
    int distortion = 0;
    int tot_rate_y = 0;
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    int64_t total_rd = 0;
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    ENTROPY_CONTEXT_PLANES t_above, t_left;
    ENTROPY_CONTEXT *ta;
    ENTROPY_CONTEXT *tl;
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    unsigned int *bmode_costs;
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    vpx_memcpy(&t_above, mb->e_mbd.above_context, sizeof(ENTROPY_CONTEXT_PLANES));
    vpx_memcpy(&t_left, mb->e_mbd.left_context, sizeof(ENTROPY_CONTEXT_PLANES));

    ta = (ENTROPY_CONTEXT *)&t_above;
    tl = (ENTROPY_CONTEXT *)&t_left;
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    vp8_intra_prediction_down_copy(xd);

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    bmode_costs = mb->inter_bmode_costs;

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    for (i = 0; i < 16; i++)
    {
        MODE_INFO *const mic = xd->mode_info_context;
        const int mis = xd->mode_info_stride;
        B_PREDICTION_MODE UNINITIALIZED_IS_SAFE(best_mode);
        int UNINITIALIZED_IS_SAFE(r), UNINITIALIZED_IS_SAFE(ry), UNINITIALIZED_IS_SAFE(d);

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        if (mb->e_mbd.frame_type == KEY_FRAME)
        {
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            const B_PREDICTION_MODE A = above_block_mode(mic, i, mis);
            const B_PREDICTION_MODE L = left_block_mode(mic, i);
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            bmode_costs  = mb->bmode_costs[A][L];
        }

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        total_rd += rd_pick_intra4x4block(
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            cpi, mb, mb->block + i, xd->block + i, &best_mode, bmode_costs,
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            ta + vp8_block2above[i],
            tl + vp8_block2left[i], &r, &ry, &d);
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        cost += r;
        distortion += d;
        tot_rate_y += ry;
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        mic->bmi[i].as_mode = best_mode;
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        if(total_rd >= (int64_t)best_rd)
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            break;
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    }

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    if(total_rd >= (int64_t)best_rd)
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        return INT_MAX;
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    *Rate = cost;
    *rate_y += tot_rate_y;
    *Distortion = distortion;

    return RDCOST(mb->rdmult, mb->rddiv, cost, distortion);
}
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static int rd_pick_intra16x16mby_mode(VP8_COMP *cpi,
                                      MACROBLOCK *x,
                                      int *Rate,
                                      int *rate_y,
                                      int *Distortion)
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{
    MB_PREDICTION_MODE mode;
    MB_PREDICTION_MODE UNINITIALIZED_IS_SAFE(mode_selected);
    int rate, ratey;
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    int distortion;
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    int best_rd = INT_MAX;
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    int this_rd;
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    //Y Search for 16x16 intra prediction mode
    for (mode = DC_PRED; mode <= TM_PRED; mode++)
    {
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        x->e_mbd.mode_info_context->mbmi.mode = mode;
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        RECON_INVOKE(&cpi->common.rtcd.recon, build_intra_predictors_mby)
            (&x->e_mbd);
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        macro_block_yrd(x, &ratey, &distortion, IF_RTCD(&cpi->rtcd.encodemb));
        rate = ratey + x->mbmode_cost[x->e_mbd.frame_type]
                                     [x->e_mbd.mode_info_context->mbmi.mode];
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        this_rd = RDCOST(x->rdmult, x->rddiv, rate, distortion);

        if (this_rd < best_rd)
        {
            mode_selected = mode;
            best_rd = this_rd;
            *Rate = rate;
            *rate_y = ratey;
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            *Distortion = distortion;
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        }
    }

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    x->e_mbd.mode_info_context->mbmi.mode = mode_selected;
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    return best_rd;
}
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#if CONFIG_I8X8
static int rd_pick_intra8x8block(
    VP8_COMP *cpi,
    MACROBLOCK *x,
    int ib,
    B_PREDICTION_MODE *best_mode,
    unsigned int *mode_costs,
    ENTROPY_CONTEXT *a,
    ENTROPY_CONTEXT *l,
    int *bestrate,
    int *bestratey,
    int *bestdistortion)
{
    MB_PREDICTION_MODE mode;
    MACROBLOCKD *xd = &x->e_mbd;
    int best_rd = INT_MAX;
    int rate = 0;
    int distortion;
    BLOCK  *be=x->block + ib;
    BLOCKD *b=x->e_mbd.block + ib;
    ENTROPY_CONTEXT ta0, ta1, besta0, besta1;
    ENTROPY_CONTEXT tl0, tl1, bestl0, bestl1;


    /*
     * The predictor buffer is a 2d buffer with a stride of 16.  Create
     * a temp buffer that meets the stride requirements, but we are only
     * interested in the left 8x8 block
     * */

    DECLARE_ALIGNED_ARRAY(16, unsigned char,  best_predictor, 16*8);
    DECLARE_ALIGNED_ARRAY(16, short, best_dqcoeff, 16*4);

    for (mode = DC_PRED; mode <= TM_PRED; mode++)
    {
        int this_rd;
        int rate_t;

        rate = mode_costs[mode];

        RECON_INVOKE(&cpi->rtcd.common->recon, intra8x8_predict)
                     (b, mode, b->predictor);

        vp8_subtract_4b_c(be, b, 16);

        x->vp8_short_fdct8x4(be->src_diff, be->coeff, 32);
        x->vp8_short_fdct8x4(be->src_diff + 64, be->coeff + 64, 32);

        x->quantize_b_pair(x->block+ib, x->block+ib+1,
                            xd->block+ib, xd->block+ib+1);
        x->quantize_b_pair(x->block+ib+4, x->block+ib+5,
                            xd->block+ib+4, xd->block+ib+5);

        distortion = ENCODEMB_INVOKE(IF_RTCD(&cpi->rtcd.encodemb), berr)
            ((x->block+ib)->coeff,(xd->block+ib)->dqcoeff)>>2;
        distortion += ENCODEMB_INVOKE(IF_RTCD(&cpi->rtcd.encodemb), berr)
            ((x->block+ib+1)->coeff,(xd->block+ib+1)->dqcoeff)>>2;
        distortion += ENCODEMB_INVOKE(IF_RTCD(&cpi->rtcd.encodemb), berr)
            ((x->block+ib+4)->coeff,(xd->block+ib+4)->dqcoeff)>>2;
        distortion += ENCODEMB_INVOKE(IF_RTCD(&cpi->rtcd.encodemb), berr)
            ((x->block+ib+5)->coeff,(xd->block+ib+5)->dqcoeff)>>2;

        ta0 = *(a + vp8_block2above[ib]);
        ta1 = *(a + vp8_block2above[ib+1]);
        tl0 = *(l + vp8_block2above[ib]);
        tl1 = *(l + vp8_block2above[ib+4]);
        rate_t = cost_coeffs(x, xd->block+ib, PLANE_TYPE_Y_WITH_DC,
            &ta0, &tl0);
        rate_t += cost_coeffs(x, xd->block+ib+1, PLANE_TYPE_Y_WITH_DC,
            &ta1, &tl0);
        rate_t += cost_coeffs(x, xd->block+ib+4, PLANE_TYPE_Y_WITH_DC,
            &ta0, &tl1);
        rate_t += cost_coeffs(x, xd->block+ib+5, PLANE_TYPE_Y_WITH_DC,
            &ta1, &tl1);
        rate += rate_t;
        this_rd = RDCOST(x->rdmult, x->rddiv, rate, distortion);
        if (this_rd < best_rd)
        {
            *bestrate = rate;
            *bestratey = rate_t;
            *bestdistortion = distortion;
            besta0 = ta0;
            besta1 = ta1;
            bestl0 = tl0;
            bestl1 = tl1;
            best_rd = this_rd;
            *best_mode = mode;
            copy_predictor_8x8(best_predictor, b->predictor);
            vpx_memcpy(best_dqcoeff, b->dqcoeff, 64);
            vpx_memcpy(best_dqcoeff+32, b->dqcoeff+64, 64);
        }
    }
    b->bmi.as_mode = (*best_mode);
    vp8_encode_intra8x8 (IF_RTCD(&cpi->rtcd), x, ib);
    *(a + vp8_block2above[ib])   = besta0;
    *(a + vp8_block2above[ib+1]) = besta1;
    *(l + vp8_block2above[ib])   = bestl0;
    *(l + vp8_block2above[ib+4]) = bestl1;
    return best_rd;
}

const int vp8_i8x8_block[4]={0, 2, 8, 10};
int rd_pick_intra8x8mby_modes(VP8_COMP *cpi,
                                      MACROBLOCK *mb,
                                      int *Rate,
                                      int *rate_y,
                                      int *Distortion,
                                      int best_rd)
{
    MACROBLOCKD *const xd = &mb->e_mbd;
    int i,ib;
    int cost = mb->mbmode_cost [xd->frame_type] [I8X8_PRED];
    int distortion = 0;
    int tot_rate_y = 0;
    long long total_rd = 0;
    ENTROPY_CONTEXT_PLANES t_above, t_left;
    ENTROPY_CONTEXT *ta;
    ENTROPY_CONTEXT *tl;
    unsigned int *i8x8mode_costs;

    vpx_memcpy(&t_above, mb->e_mbd.above_context, sizeof(ENTROPY_CONTEXT_PLANES));
    vpx_memcpy(&t_left, mb->e_mbd.left_context, sizeof(ENTROPY_CONTEXT_PLANES));

    ta = (ENTROPY_CONTEXT *)&t_above;
    tl = (ENTROPY_CONTEXT *)&t_left;

    i8x8mode_costs  = mb->i8x8_mode_costs;

    for (i = 0; i < 4; i++)
    {
        MODE_INFO *const mic = xd->mode_info_context;
        const int mis = xd->mode_info_stride;
        B_PREDICTION_MODE UNINITIALIZED_IS_SAFE(best_mode);
        int UNINITIALIZED_IS_SAFE(r), UNINITIALIZED_IS_SAFE(ry), UNINITIALIZED_IS_SAFE(d);

        ib = vp8_i8x8_block[i];
        total_rd += rd_pick_intra8x8block(
            cpi, mb, ib, &best_mode, i8x8mode_costs,
            ta, tl, &r, &ry, &d);
        cost += r;
        distortion += d;
        tot_rate_y += ry;
        mic->bmi[ib].as_mode = best_mode;
    }
    *Rate = cost;
    *rate_y += tot_rate_y;
    *Distortion = distortion;
    return RDCOST(mb->rdmult, mb->rddiv, cost, distortion);
}
#endif
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static int rd_cost_mbuv(MACROBLOCK *mb)
{
    int b;
    int cost = 0;
    MACROBLOCKD *x = &mb->e_mbd;
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    ENTROPY_CONTEXT_PLANES t_above, t_left;
    ENTROPY_CONTEXT *ta;
    ENTROPY_CONTEXT *tl;

    vpx_memcpy(&t_above, mb->e_mbd.above_context, sizeof(ENTROPY_CONTEXT_PLANES));
    vpx_memcpy(&t_left, mb->e_mbd.left_context, sizeof(ENTROPY_CONTEXT_PLANES));
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    ta = (ENTROPY_CONTEXT *)&t_above;
    tl = (ENTROPY_CONTEXT *)&t_left;
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    for (b = 16; b < 24; b++)
        cost += cost_coeffs(mb, x->block + b, PLANE_TYPE_UV,
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                    ta + vp8_block2above[b], tl + vp8_block2left[b]);
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    return cost;
}


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static int rd_inter16x16_uv(VP8_COMP *cpi, MACROBLOCK *x, int *rate,
                            int *distortion, int fullpixel)
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{
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#if CONFIG_T8X8
    int tx_type = get_seg_tx_type(&x->e_mbd,
                                  x->e_mbd.mode_info_context->mbmi.segment_id);
#endif

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    vp8_build_inter16x16_predictors_mbuv(&x->e_mbd);
    ENCODEMB_INVOKE(IF_RTCD(&cpi->rtcd.encodemb), submbuv)(x->src_diff,
        x->src.u_buffer, x->src.v_buffer, x->e_mbd.predictor, x->src.uv_stride);
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#if CONFIG_T8X8
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    if( tx_type == TX_8X8 )
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       vp8_transform_mbuv_8x8(x);
    else
#endif
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    vp8_transform_mbuv(x);
    vp8_quantize_mbuv(x);

    *rate       = rd_cost_mbuv(x);
    *distortion = ENCODEMB_INVOKE(&cpi->rtcd.encodemb, mbuverr)(x) / 4;

    return RDCOST(x->rdmult, x->rddiv, *rate, *distortion);
}

static int rd_inter4x4_uv(VP8_COMP *cpi, MACROBLOCK *x, int *rate,
                          int *distortion, int fullpixel)
{
    vp8_build_inter4x4_predictors_mbuv(&x->e_mbd);
    ENCODEMB_INVOKE(IF_RTCD(&cpi->rtcd.encodemb), submbuv)(x->src_diff,
        x->src.u_buffer, x->src.v_buffer, x->e_mbd.predictor, x->src.uv_stride);

    vp8_transform_mbuv(x);
    vp8_quantize_mbuv(x);
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    *rate       = rd_cost_mbuv(x);
    *distortion = ENCODEMB_INVOKE(&cpi->rtcd.encodemb, mbuverr)(x) / 4;

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    return RDCOST(x->rdmult, x->rddiv, *rate, *distortion);
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}

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static void rd_pick_intra_mbuv_mode(VP8_COMP *cpi, MACROBLOCK *x, int *rate, int *rate_tokenonly, int *distortion)
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{
    MB_PREDICTION_MODE mode;
    MB_PREDICTION_MODE UNINITIALIZED_IS_SAFE(mode_selected);
    int best_rd = INT_MAX;
    int UNINITIALIZED_IS_SAFE(d), UNINITIALIZED_IS_SAFE(r);
    int rate_to;

    for (mode = DC_PRED; mode <= TM_PRED; mode++)
    {
        int rate;
        int distortion;
        int this_rd;

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        x->e_mbd.mode_info_context->mbmi.uv_mode = mode;
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        RECON_INVOKE(&cpi->rtcd.common->recon, build_intra_predictors_mbuv)
                     (&x->e_mbd);
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        ENCODEMB_INVOKE(IF_RTCD(&cpi->rtcd.encodemb), submbuv)(x->src_diff,
                      x->src.u_buffer, x->src.v_buffer, x->e_mbd.predictor,
                      x->src.uv_stride);
        vp8_transform_mbuv(x);
        vp8_quantize_mbuv(x);
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        rate_to = rd_cost_mbuv(x);
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        rate = rate_to + x->intra_uv_mode_cost[x->e_mbd.frame_type][x->e_mbd.mode_info_context->mbmi.uv_mode];
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        distortion = ENCODEMB_INVOKE(&cpi->rtcd.encodemb, mbuverr)(x) / 4;
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        this_rd = RDCOST(x->rdmult, x->rddiv, rate, distortion);
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        if (this_rd < best_rd)
        {
            best_rd = this_rd;
            d = distortion;
            r = rate;
            *rate_tokenonly = rate_to;
            mode_selected = mode;
        }
    }

    *rate = r;
    *distortion = d;

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    x->e_mbd.mode_info_context->mbmi.uv_mode = mode_selected;
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}

int vp8_cost_mv_ref(MB_PREDICTION_MODE m, const int near_mv_ref_ct[4])
{
    vp8_prob p [VP8_MVREFS-1];
    assert(NEARESTMV <= m  &&  m <= SPLITMV);
    vp8_mv_ref_probs(p, near_mv_ref_ct);
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    return vp8_cost_token(vp8_mv_ref_tree, p,
                          vp8_mv_ref_encoding_array - NEARESTMV + m);
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}

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void vp8_set_mbmode_and_mvs(MACROBLOCK *x, MB_PREDICTION_MODE mb, int_mv *mv)
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{
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    x->e_mbd.mode_info_context->mbmi.mode = mb;
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    x->e_mbd.mode_info_context->mbmi.mv.as_int = mv->as_int;
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}

static int labels2mode(
    MACROBLOCK *x,
    int const *labelings, int which_label,
    B_PREDICTION_MODE this_mode,
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    int_mv *this_mv, int_mv *best_ref_mv,
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    int *mvcost[2]
)
{
    MACROBLOCKD *const xd = & x->e_mbd;
    MODE_INFO *const mic = xd->mode_info_context;
    const int mis = xd->mode_info_stride;

    int cost = 0;
    int thismvcost = 0;

    /* We have to be careful retrieving previously-encoded motion vectors.
       Ones from this macroblock have to be pulled from the BLOCKD array
       as they have not yet made it to the bmi array in our MB_MODE_INFO. */

    int i = 0;

    do
    {
        BLOCKD *const d = xd->block + i;
        const int row = i >> 2,  col = i & 3;

        B_PREDICTION_MODE m;

        if (labelings[i] != which_label)
            continue;

        if (col  &&  labelings[i] == labelings[i-1])
            m = LEFT4X4;
        else if (row  &&  labelings[i] == labelings[i-4])
            m = ABOVE4X4;
        else
        {
            // the only time we should do costing for new motion vector or mode
            // is when we are on a new label  (jbb May 08, 2007)
            switch (m = this_mode)
            {
            case NEW4X4 :
                thismvcost  = vp8_mv_bit_cost(this_mv, best_ref_mv, mvcost, 102);
                break;
            case LEFT4X4:
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                this_mv->as_int = col ? d[-1].bmi.mv.as_int : left_block_mv(mic, i);
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                break;
            case ABOVE4X4:
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                this_mv->as_int = row ? d[-4].bmi.mv.as_int : above_block_mv(mic, i, mis);
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                break;
            case ZERO4X4:
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                this_mv->as_int = 0;
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                break;
            default:
                break;
            }

            if (m == ABOVE4X4)  // replace above with left if same
            {
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                int_mv left_mv;
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                left_mv.as_int = col ? d[-1].bmi.mv.as_int :
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                                        left_block_mv(mic, i);
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                if (left_mv.as_int == this_mv->as_int)
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                    m = LEFT4X4;
            }

            cost = x->inter_bmode_costs[ m];
        }

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        d->bmi.mv.as_int = this_mv->as_int;
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        x->partition_info->bmi[i].mode = m;
        x->partition_info->bmi[i].mv.as_int = this_mv->as_int;

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    }
    while (++i < 16);

    cost += thismvcost ;
    return cost;
}

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static int rdcost_mbsegment_y(MACROBLOCK *mb, const int *labels,
                              int which_label, ENTROPY_CONTEXT *ta,
                              ENTROPY_CONTEXT *tl)
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{
    int cost = 0;
    int b;
    MACROBLOCKD *x = &mb->e_mbd;

    for (b = 0; b < 16; b++)
        if (labels[ b] == which_label)
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            cost += cost_coeffs(mb, x->block + b, PLANE_TYPE_Y_WITH_DC,
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                                ta + vp8_block2above[b],
                                tl + vp8_block2left[b]);
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    return cost;

}
static unsigned int vp8_encode_inter_mb_segment(MACROBLOCK *x, int const *labels, int which_label, const vp8_encodemb_rtcd_vtable_t *rtcd)
{
    int i;
    unsigned int distortion = 0;

    for (i = 0; i < 16; i++)
    {
        if (labels[i] == which_label)
        {
            BLOCKD *bd = &x->e_mbd.block[i];
            BLOCK *be = &x->block[i];


            vp8_build_inter_predictors_b(bd, 16, x->e_mbd.subpixel_predict);
            ENCODEMB_INVOKE(rtcd, subb)(be, bd, 16);
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            x->vp8_short_fdct4x4(be->src_diff, be->coeff, 32);
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            // set to 0 no way to account for 2nd order DC so discount
            //be->coeff[0] = 0;
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            x->quantize_b(be, bd);
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            distortion += ENCODEMB_INVOKE(rtcd, berr)(be->coeff, bd->dqcoeff);
        }
    }

    return distortion;
}

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static const unsigned int segmentation_to_sseshift[4] = {3, 3, 2, 0};


typedef struct
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{
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  int_mv *ref_mv;
  int_mv mvp;
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  int segment_rd;
  int segment_num;
  int r;
  int d;
  int segment_yrate;
  B_PREDICTION_MODE modes[16];
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  int_mv mvs[16];
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  unsigned char eobs[16];

  int mvthresh;
  int *mdcounts;

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  int_mv sv_mvp[4];     // save 4 mvp from 8x8
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  int sv_istep[2];  // save 2 initial step_param for 16x8/8x16

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} BEST_SEG_INFO;


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static void rd_check_segment(VP8_COMP *cpi, MACROBLOCK *x,
                             BEST_SEG_INFO *bsi, unsigned int segmentation)
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{
    int i;
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    int const *labels;
    int br = 0;
    int bd = 0;
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    B_PREDICTION_MODE this_mode;
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    int label_count;
    int this_segment_rd = 0;
    int label_mv_thresh;
    int rate = 0;
    int sbr = 0;
    int sbd = 0;
    int segmentyrate = 0;

    vp8_variance_fn_ptr_t *v_fn_ptr;

    ENTROPY_CONTEXT_PLANES t_above, t_left;
    ENTROPY_CONTEXT *ta;
    ENTROPY_CONTEXT *tl;
    ENTROPY_CONTEXT_PLANES t_above_b, t_left_b;
    ENTROPY_CONTEXT *ta_b;
    ENTROPY_CONTEXT *tl_b;
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    vpx_memcpy(&t_above, x->e_mbd.above_context, sizeof(ENTROPY_CONTEXT_PLANES));
    vpx_memcpy(&t_left, x->e_mbd.left_context, sizeof(ENTROPY_CONTEXT_PLANES));
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    ta = (ENTROPY_CONTEXT *)&t_above;
    tl = (ENTROPY_CONTEXT *)&t_left;
    ta_b = (ENTROPY_CONTEXT *)&t_above_b;
    tl_b = (ENTROPY_CONTEXT *)&t_left_b;

    br = 0;
    bd = 0;
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    v_fn_ptr = &cpi->fn_ptr[segmentation];
    labels = vp8_mbsplits[segmentation];
    label_count = vp8_mbsplit_count[segmentation];
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    // 64 makes this threshold really big effectively
    // making it so that we very rarely check mvs on
    // segments.   setting this to 1 would make mv thresh
    // roughly equal to what it is for macroblocks
    label_mv_thresh = 1 * bsi->mvthresh / label_count ;

    // Segmentation method overheads
    rate = vp8_cost_token(vp8_mbsplit_tree, vp8_mbsplit_probs, vp8_mbsplit_encodings + segmentation);
    rate += vp8_cost_mv_ref(SPLITMV, bsi->mdcounts);
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    this_segment_rd += RDCOST(x->rdmult, x->rddiv, rate, 0);
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    br += rate;

    for (i = 0; i < label_count; i++)
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    {
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        int_mv mode_mv[B_MODE_COUNT];
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        int best_label_rd = INT_MAX;
        B_PREDICTION_MODE mode_selected = ZERO4X4;
        int bestlabelyrate = 0;
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        // search for the best motion vector on this segment
        for (this_mode = LEFT4X4; this_mode <= NEW4X4 ; this_mode ++)
        {
            int this_rd;
            int distortion;
            int labelyrate;
            ENTROPY_CONTEXT_PLANES t_above_s, t_left_s;
            ENTROPY_CONTEXT *ta_s;
            ENTROPY_CONTEXT *tl_s;
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            vpx_memcpy(&t_above_s, &t_above, sizeof(ENTROPY_CONTEXT_PLANES));
            vpx_memcpy(&t_left_s, &t_left, sizeof(ENTROPY_CONTEXT_PLANES));
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            ta_s = (ENTROPY_CONTEXT *)&t_above_s;
            tl_s = (ENTROPY_CONTEXT *)&t_left_s;
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            if (this_mode == NEW4X4)
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            {
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                int sseshift;
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                int num00;
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                int step_param = 0;
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                int further_steps;
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                int n;
                int thissme;
                int bestsme = INT_MAX;
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                int_mv  temp_mv;
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                BLOCK *c;
                BLOCKD *e;
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                // Is the best so far sufficiently good that we cant justify doing and new motion search.
                if (best_label_rd < label_mv_thresh)
                    break;
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                if(cpi->compressor_speed)
                {
                    if (segmentation == BLOCK_8X16 || segmentation == BLOCK_16X8)
                    {
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                        bsi->mvp.as_int = bsi->sv_mvp[i].as_int;
                        if (i==1 && segmentation == BLOCK_16X8)
                          bsi->mvp.as_int = bsi->sv_mvp[2].as_int;
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                        step_param = bsi->sv_istep[i];
                    }

                    // use previous block's result as next block's MV predictor.
                    if (segmentation == BLOCK_4X4 && i>0)
                    {
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                        bsi->mvp.as_int = x->e_mbd.block[i-1].bmi.mv.as_int;
                        if (i==4 || i==8 || i==12)
                            bsi->mvp.as_int = x->e_mbd.block[i-4].bmi.mv.as_int;
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                        step_param = 2;
                    }
                }

                further_steps = (MAX_MVSEARCH_STEPS - 1) - step_param;

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                {
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                    int sadpb = x->sadperbit4;
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                    int_mv mvp_full;

                    mvp_full.as_mv.row = bsi->mvp.as_mv.row >>3;
                    mvp_full.as_mv.col = bsi->mvp.as_mv.col >>3;
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                    // find first label
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                    n = vp8_mbsplit_offset[segmentation][i];
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                    c = &x->block[n];
                    e = &x->e_mbd.block[n];
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                    {
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                        bestsme = cpi->diamond_search_sad(x, c, e, &mvp_full,
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                                                &mode_mv[NEW4X4], step_param,
                                                sadpb, &num00, v_fn_ptr,
                                                x->mvcost, bsi->ref_mv);
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                        n = num00;
                        num00 = 0;
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                        while (n < further_steps)
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                        {
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                            n++;
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                            if (num00)
                                num00--;
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                            else
                            {
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                                thissme = cpi->diamond_search_sad(x, c, e,
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                                                    &mvp_full, &temp_mv,
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                                                    step_param + n, sadpb,
                                                    &num00, v_fn_ptr,
                                                    x->mvcost, bsi->ref_mv);
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                                if (thissme < bestsme)
                                {
                                    bestsme = thissme;
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                                    mode_mv[NEW4X4].as_int = temp_mv.as_int;
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                                }
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                            }
                        }
                    }

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                    sseshift = segmentation_to_sseshift[segmentation];

                    // Should we do a full search (best quality only)
                    if ((cpi->compressor_speed == 0) && (bestsme >> sseshift) > 4000)
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                    {
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                        /* Check if mvp_full is within the range. */
                        vp8_clamp_mv(&mvp_full, x->mv_col_min, x->mv_col_max, x->mv_row_min, x->mv_row_max);

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                        thissme = cpi->full_search_sad(x, c, e, &mvp_full,
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                                                       sadpb, 16, v_fn_ptr,
                                                       x->mvcost, bsi->ref_mv);
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                        if (thissme < bestsme)
                        {
                            bestsme = thissme;
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                            mode_mv[NEW4X4].as_int = e->bmi.mv.as_int;
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                        }
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                        else
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                        {
                            // The full search result is actually worse so re-instate the previous best vector
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                            e->bmi.mv.as_int = mode_mv[NEW4X4].as_int;
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                        }
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                    }
                }

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