rdopt.c 125 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 "vp8/common/quant_common.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 "ratectrl.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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#include "vp8/common/seg_common.h"
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#include "vp8/common/pred_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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#if CONFIG_HIGH_PRECISION_MV
#define XMVCOST (x->e_mbd.allow_high_precision_mv?x->mvcost_hp:x->mvcost)
#else
#define XMVCOST (x->mvcost)
#endif

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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,
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    I8X8_PRED,
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    /* compound prediction modes */
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    ZEROMV,
    NEARESTMV,
    NEARMV,

    ZEROMV,
    NEARESTMV,
    NEARMV,

    ZEROMV,
    NEARESTMV,
    NEARMV,

    NEWMV,
    NEWMV,
    NEWMV,
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};

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,
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    INTRA_FRAME,
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    /* compound prediction modes */
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    LAST_FRAME,
    LAST_FRAME,
    LAST_FRAME,

    ALTREF_FRAME,
    ALTREF_FRAME,
    ALTREF_FRAME,

    GOLDEN_FRAME,
    GOLDEN_FRAME,
    GOLDEN_FRAME,

    LAST_FRAME,
    ALTREF_FRAME,
    GOLDEN_FRAME,
};

const MV_REFERENCE_FRAME vp8_second_ref_frame_order[MAX_MODES] =
{
    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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    /* compound prediction modes */
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    GOLDEN_FRAME,
    GOLDEN_FRAME,
    GOLDEN_FRAME,

    LAST_FRAME,
    LAST_FRAME,
    LAST_FRAME,

    ALTREF_FRAME,
    ALTREF_FRAME,
    ALTREF_FRAME,

    GOLDEN_FRAME,
    LAST_FRAME,
    ALTREF_FRAME,
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};

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++)
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            {

                if(k == 0 && ((j > 0 && i > 0) || (j > 1 && i == 0)))
                    vp8_cost_tokens_skip((int *)(c [i][j][k]), p [i][j][k], vp8_coef_tree);
                else

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

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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];
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/* values are now correlated to quantizer */
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static int sad_per_bit16lut[QINDEX_RANGE];
static int sad_per_bit4lut[QINDEX_RANGE];

void vp8_init_me_luts()
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{
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    int i;

    // Initialize the sad lut tables using a formulaic calculation for now
    // This is to make it easier to resolve the impact of experimental changes
    // to the quantizer tables.
    for ( i = 0; i < QINDEX_RANGE; i++ )
    {
        sad_per_bit16lut[i] =
            (int)((0.0418*vp8_convert_qindex_to_q(i)) + 2.4107);
        sad_per_bit4lut[i] = (int)((0.063*vp8_convert_qindex_to_q(i)) + 2.742);
    }
}
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int compute_rd_mult( int qindex )
{
    int q;

    q = vp8_dc_quant(qindex,0);
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    return (11 * q * q) >> 6;
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}

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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>MAXQ)?MAXQ : QIndex);
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    cpi->RDMULT = compute_rd_mult(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 (cpi->RDMULT < 7)
        cpi->RDMULT = 7;
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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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    vp8_set_speed_features(cpi);

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    q = (int)pow(vp8_dc_quant(QIndex,0)>>2, 1.25);
    q = q << 2;
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    cpi->RDMULT = cpi->RDMULT << 4;
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    if (q < 8)
        q = 8;
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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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    fill_token_costs(
        cpi->mb.token_costs_8x8,
        (const vp8_prob( *)[8][3][11]) cpi->common.fc.coef_probs_8x8
    );
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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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#if CONFIG_SIXTEENTH_SUBPEL_UV
        VARIANCE_INVOKE(rtcd, subpixvar8x8)(uptr, pre_stride,
            (mv_col & 7)<<1, (mv_row & 7)<<1, upred_ptr, uv_stride, &sse2);
        VARIANCE_INVOKE(rtcd, subpixvar8x8)(vptr, pre_stride,
            (mv_col & 7)<<1, (mv_row & 7)<<1, vpred_ptr, uv_stride, &sse1);
#else
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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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#endif
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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,
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                             const VP8_ENCODER_RTCD *rtcd)
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{
    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->encodemb, 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
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    d = ENCODEMB_INVOKE(&rtcd->encodemb, mberr)(mb, 1);
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    d += ENCODEMB_INVOKE(&rtcd->encodemb, berr)(mb_y2->coeff, x_y2->dqcoeff);
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    *Distortion = (d >> 2);
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    // rate
    *Rate = vp8_rdcost_mby(mb);
}
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static int cost_coeffs_2x2(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);
    assert(eob<=4);

# define QC2X2( I)  ( qcoeff_ptr [vp8_default_zig_zag1d[I]] )

    for (; c < eob; c++)
    {
        int v = QC2X2(c);
        int t = vp8_dct_value_tokens_ptr[v].Token;
        cost += mb->token_costs_8x8[type] [vp8_coef_bands[c]] [pt] [t];
        cost += vp8_dct_value_cost_ptr[v];
        pt = vp8_prev_token_class[t];
    }

# undef QC2X2
    if (c < 4)
        cost += mb->token_costs_8x8 [type][vp8_coef_bands[c]]
                                    [pt] [DCT_EOB_TOKEN];

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


static int cost_coeffs_8x8(MACROBLOCK *mb,
                           BLOCKD *b, int type,
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                           ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l)
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{
    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;

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    VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);
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# define QC8X8( I)  ( qcoeff_ptr [vp8_default_zig_zag1d_8x8[I]] )

    for (; c < eob; c++)
    {
        int v = QC8X8(c);
        int t = vp8_dct_value_tokens_ptr[v].Token;
        cost += mb->token_costs_8x8[type] [vp8_coef_bands_8x8[c]] [pt] [t];
        cost += vp8_dct_value_cost_ptr[v];
        pt = vp8_prev_token_class[t];
    }

# undef QC8X8
    if (c < 64)
        cost += mb->token_costs_8x8 [type][vp8_coef_bands_8x8[c]]
                                    [pt] [DCT_EOB_TOKEN];

    pt = (c != !type); // is eob first coefficient;
    *a = *l = pt;
    return cost;
}
static int vp8_rdcost_mby_8x8(MACROBLOCK *mb)
{
    int cost = 0;
    int b;
    MACROBLOCKD *x = &mb->e_mbd;
    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));

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

    for (b = 0; b < 16; b+=4)
        cost += cost_coeffs_8x8(mb, x->block + b, PLANE_TYPE_Y_NO_DC,
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                    ta + vp8_block2above_8x8[b], tl + vp8_block2left_8x8[b]);
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    cost += cost_coeffs_2x2(mb, x->block + 24, PLANE_TYPE_Y2,
                ta + vp8_block2above[24], tl + vp8_block2left[24]);
    return cost;
}

static void macro_block_yrd_8x8( MACROBLOCK *mb,
                             int *Rate,
                             int *Distortion,
                             const VP8_ENCODER_RTCD *rtcd)
{
    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;
    int d;

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    ENCODEMB_INVOKE(&rtcd->encodemb, submby)(
        mb->src_diff,
        *(mb->block[0].base_src),
        mb->e_mbd.predictor,
        mb->block[0].src_stride );
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    vp8_transform_mby_8x8(mb);
    vp8_quantize_mby_8x8(mb);

    /* remove 1st order dc to properly combine 1st/2nd order distortion */
    mb->coeff[0] = 0;
    mb->coeff[64] = 0;
    mb->coeff[128] = 0;
    mb->coeff[192] = 0;
    mb->e_mbd.dqcoeff[0] = 0;
    mb->e_mbd.dqcoeff[64] = 0;
    mb->e_mbd.dqcoeff[128] = 0;
    mb->e_mbd.dqcoeff[192] = 0;

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    d = ENCODEMB_INVOKE(&rtcd->encodemb, mberr)(mb, 0);
    d += ENCODEMB_INVOKE(&rtcd->encodemb, berr)(mb_y2->coeff, x_y2->dqcoeff);
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    *Distortion = (d >> 2);
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    // rate
    *Rate = vp8_rdcost_mby_8x8(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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#if CONFIG_COMP_INTRA_PRED
    B_PREDICTION_MODE *best_second_mode,
#endif
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    unsigned int *bmode_costs,
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    ENTROPY_CONTEXT *a,
    ENTROPY_CONTEXT *l,

    int *bestrate,
    int *bestratey,
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    int *bestdistortion,
    int allow_comp)
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{
    B_PREDICTION_MODE mode;
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#if CONFIG_COMP_INTRA_PRED
    B_PREDICTION_MODE mode2;
#endif
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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++)
    {
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#if CONFIG_COMP_INTRA_PRED
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        for (mode2 = (allow_comp ? 0 : (B_DC_PRED - 1)); mode2 != (allow_comp ? (mode + 1) : 0); mode2++)
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        {
#endif
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        int this_rd;
        int ratey;

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        // TODO Temporarily ignore modes that need the above-right data. SB
        // encoding means this data is not available for the bottom right MB
        // Do we need to do this for mode2 also?
        if (mode==B_LD_PRED || mode==B_VL_PRED)
            continue;

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        rate = bmode_costs[mode];

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#if CONFIG_COMP_INTRA_PRED
            if (mode2 == (B_PREDICTION_MODE) (B_DC_PRED - 1))
            {
#endif
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        RECON_INVOKE(&cpi->rtcd.common->recon, intra4x4_predict)
                     (b, mode, b->predictor);
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#if CONFIG_COMP_INTRA_PRED
            }
            else
            {
                RECON_INVOKE(&cpi->rtcd.common->recon, comp_intra4x4_predict)
                    (b, mode, mode2, b->predictor);
                rate += bmode_costs[mode2];
            }
#endif
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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;
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        distortion = ENCODEMB_INVOKE(IF_RTCD(&cpi->rtcd.encodemb), berr)(
            be->coeff, b->dqcoeff) >> 2;
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        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;
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#if CONFIG_COMP_INTRA_PRED
            *best_second_mode = mode2;
#endif
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            *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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#if CONFIG_COMP_INTRA_PRED
        }
#endif
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        }
    }
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    b->bmi.as_mode.first = (B_PREDICTION_MODE)(*best_mode);
#if CONFIG_COMP_INTRA_PRED
    b->bmi.as_mode.second = (B_PREDICTION_MODE)(*best_second_mode);
#endif
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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,
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                                     int *rate_y, int *Distortion, int best_rd,
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                                     int allow_comp, int update_contexts)
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{
    int i;
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    MACROBLOCKD *const xd = &mb->e_mbd;
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    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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    if (update_contexts)
    {
        ta = (ENTROPY_CONTEXT *)mb->e_mbd.above_context;
        tl = (ENTROPY_CONTEXT *)mb->e_mbd.left_context;
    }
    else
    {
        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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#if 0
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    vp8_intra_prediction_down_copy(xd);
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#endif
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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);
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#if CONFIG_COMP_INTRA_PRED
        B_PREDICTION_MODE UNINITIALIZED_IS_SAFE(best_second_mode);
#endif
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        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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