decodemv.c 29.1 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 "treereader.h"
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#include "vp8/common/entropymv.h"
#include "vp8/common/entropymode.h"
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#include "onyxd_int.h"
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#include "vp8/common/findnearmv.h"
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//#if CONFIG_SEGFEATURES
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#include "vp8/common/seg_common.h"

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#if CONFIG_DEBUG
#include <assert.h>
#endif
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static int vp8_read_bmode(vp8_reader *bc, const vp8_prob *p)
{
    const int i = vp8_treed_read(bc, vp8_bmode_tree, p);

    return i;
}


static int vp8_read_ymode(vp8_reader *bc, const vp8_prob *p)
{
    const int i = vp8_treed_read(bc, vp8_ymode_tree, p);

    return i;
}

static int vp8_kfread_ymode(vp8_reader *bc, const vp8_prob *p)
{
    const int i = vp8_treed_read(bc, vp8_kf_ymode_tree, p);

    return i;
}
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static int vp8_read_i8x8_mode(vp8_reader *bc, const vp8_prob *p)
{
    const int i = vp8_treed_read(bc, vp8_i8x8_mode_tree, p);
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    return i;
}
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static int vp8_read_uv_mode(vp8_reader *bc, const vp8_prob *p)
{
    const int i = vp8_treed_read(bc, vp8_uv_mode_tree, p);

    return i;
}

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// This function reads the current macro block's segnment id to from bitstream
// It should only be called if a segment map update is indicated.
static void vp8_read_mb_segid(vp8_reader *r, MB_MODE_INFO *mi, MACROBLOCKD *x)
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{
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    /* Is segmentation enabled */
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    if (x->segmentation_enabled && x->update_mb_segmentation_map)
    {
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        /* If so then read the segment id. */
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        if (vp8_read(r, x->mb_segment_tree_probs[0]))
            mi->segment_id = (unsigned char)(2 + vp8_read(r, x->mb_segment_tree_probs[2]));
        else
            mi->segment_id = (unsigned char)(vp8_read(r, x->mb_segment_tree_probs[1]));
    }
}
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extern const int vp8_i8x8_block[4];
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static void vp8_kfread_modes(VP8D_COMP *pbi,
                             MODE_INFO *m,
                             int mb_row,
                             int mb_col)
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{
    vp8_reader *const bc = & pbi->bc;
    const int mis = pbi->common.mode_info_stride;
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    int map_index = mb_row * pbi->common.mb_cols + mb_col;
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    MB_PREDICTION_MODE y_mode;
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    // Read the Macroblock segmentation map if it is being updated explicitly
    // this frame (reset to 0 above by default).
    m->mbmi.segment_id = 0;
    if (pbi->mb.update_mb_segmentation_map)
    {
        vp8_read_mb_segid(bc, &m->mbmi, &pbi->mb);
        pbi->segmentation_map[map_index] = m->mbmi.segment_id;
    }
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//#if CONFIG_SEGFEATURES
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    if ( pbi->common.mb_no_coeff_skip &&
         ( !segfeature_active( &pbi->mb,
                               m->mbmi.segment_id, SEG_LVL_EOB ) ||
           ( get_segdata( &pbi->mb,
                          m->mbmi.segment_id, SEG_LVL_EOB ) != 0 ) ) )
    {
        m->mbmi.mb_skip_coeff = vp8_read(bc, pbi->prob_skip_false);
    }
    else
    {
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//#if CONFIG_SEGFEATURES
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        if ( segfeature_active( &pbi->mb,
                                m->mbmi.segment_id, SEG_LVL_EOB ) &&
             ( get_segdata( &pbi->mb,
                            m->mbmi.segment_id, SEG_LVL_EOB ) == 0 ) )
        {
            m->mbmi.mb_skip_coeff = 1;
        }
        else
            m->mbmi.mb_skip_coeff = 0;
    }
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#if CONFIG_QIMODE
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    y_mode = (MB_PREDICTION_MODE) vp8_kfread_ymode(bc,
        pbi->common.kf_ymode_prob[pbi->common.kf_ymode_probs_index]);
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#else
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    y_mode = (MB_PREDICTION_MODE) vp8_kfread_ymode(
                                      bc, pbi->common.kf_ymode_prob);
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#endif
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    m->mbmi.ref_frame = INTRA_FRAME;

    if ((m->mbmi.mode = y_mode) == B_PRED)
    {
        int i = 0;
        do
        {
            const B_PREDICTION_MODE A = above_block_mode(m, i, mis);
            const B_PREDICTION_MODE L = left_block_mode(m, i);

            m->bmi[i].as_mode =
                (B_PREDICTION_MODE) vp8_read_bmode(
                                        bc, pbi->common.kf_bmode_prob [A] [L]);
        }
        while (++i < 16);
    }
    if((m->mbmi.mode = y_mode) == I8X8_PRED)
    {
        int i;
        int mode8x8;
        for(i=0;i<4;i++)
         {
             int ib = vp8_i8x8_block[i];
             mode8x8 = vp8_read_i8x8_mode(bc, pbi->common.i8x8_mode_prob);
             m->bmi[ib+0].as_mode= mode8x8;
             m->bmi[ib+1].as_mode= mode8x8;
             m->bmi[ib+4].as_mode= mode8x8;
             m->bmi[ib+5].as_mode= mode8x8;
         }
   }
    else
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#if CONFIG_UVINTRA
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        m->mbmi.uv_mode = (MB_PREDICTION_MODE)vp8_read_uv_mode(bc,
            pbi->common.kf_uv_mode_prob[m->mbmi.mode]);
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#else
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        m->mbmi.uv_mode = (MB_PREDICTION_MODE)vp8_read_uv_mode(bc,
            pbi->common.kf_uv_mode_prob);
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#endif
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}
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static int read_mvcomponent(vp8_reader *r, const MV_CONTEXT *mvc)
{
    const vp8_prob *const p = (const vp8_prob *) mvc;
    int x = 0;

    if (vp8_read(r, p [mvpis_short]))  /* Large */
    {
        int i = 0;

        do
        {
            x += vp8_read(r, p [MVPbits + i]) << i;
        }
        while (++i < 3);

        i = mvlong_width - 1;  /* Skip bit 3, which is sometimes implicit */

        do
        {
            x += vp8_read(r, p [MVPbits + i]) << i;
        }
        while (--i > 3);

        if (!(x & 0xFFF0)  ||  vp8_read(r, p [MVPbits + 3]))
            x += 8;
    }
    else   /* small */
        x = vp8_treed_read(r, vp8_small_mvtree, p + MVPshort);

    if (x  &&  vp8_read(r, p [MVPsign]))
        x = -x;

    return x;
}

static void read_mv(vp8_reader *r, MV *mv, const MV_CONTEXT *mvc)
{
    mv->row = (short)(read_mvcomponent(r,   mvc) << 1);
    mv->col = (short)(read_mvcomponent(r, ++mvc) << 1);
}


static void read_mvcontexts(vp8_reader *bc, MV_CONTEXT *mvc)
{
    int i = 0;

    do
    {
        const vp8_prob *up = vp8_mv_update_probs[i].prob;
        vp8_prob *p = (vp8_prob *)(mvc + i);
        vp8_prob *const pstop = p + MVPcount;

        do
        {
            if (vp8_read(bc, *up++))
            {
                const vp8_prob x = (vp8_prob)vp8_read_literal(bc, 7);

                *p = x ? x << 1 : 1;
            }
        }
        while (++p < pstop);
    }
    while (++i < 2);
}

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// Read the referncence frame
static MV_REFERENCE_FRAME read_ref_frame( VP8D_COMP *pbi,
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                                          vp8_reader *const bc,
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                                          unsigned char segment_id )
{
    MV_REFERENCE_FRAME ref_frame;
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    int seg_ref_active;
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//#if CONFIG_SEGFEATURES
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    MACROBLOCKD *const xd = &pbi->mb;

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    seg_ref_active = segfeature_active( xd,
                                        segment_id,
                                        SEG_LVL_REF_FRAME );
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    // Segment reference frame features not available
    if ( !seg_ref_active )
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    {
        ref_frame =
            (MV_REFERENCE_FRAME) vp8_read(bc, pbi->prob_intra);

        if (ref_frame)
        {
            if (vp8_read(bc, pbi->prob_last))
            {
                ref_frame = (MV_REFERENCE_FRAME)((int)ref_frame +
                            (int)(1 + vp8_read(bc, pbi->prob_gf)));
            }
        }
    }

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//#if CONFIG_SEGFEATURES
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    // Segment reference frame features are enabled
    else
    {
        // If there are no inter reference frames enabled we can set INTRA
        if ( !check_segref_inter(xd, segment_id) )
        {
            ref_frame = INTRA_FRAME;
        }
        else
        {
            // Else if there are both intra and inter options we need to read
            // the inter / intra flag, else mark as inter.
            if ( check_segref( xd, segment_id, INTRA_FRAME ) )
                ref_frame = (MV_REFERENCE_FRAME) vp8_read(bc, pbi->prob_intra);
            else
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                ref_frame = LAST_FRAME;
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            if ( ref_frame == LAST_FRAME )
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            {
                // Now consider last vs (golden or alt) flag....
                // If Last is not enabled
                if ( !check_segref( xd, segment_id, LAST_FRAME ) )
                {
                    // If not golden then it must be altref
                    if (!check_segref( xd, segment_id, GOLDEN_FRAME ))
                    {
                        ref_frame = ALTREF_FRAME;
                    }
                    // Not Altref therefore must be Golden
                    else if (!check_segref( xd, segment_id,
                                               ALTREF_FRAME ))
                    {
                        ref_frame = GOLDEN_FRAME;
                    }
                    // Else we must read bit to decide.
                    else
                    {
                        ref_frame = (MV_REFERENCE_FRAME)((int)ref_frame +
                                    (int)(1 + vp8_read(bc, pbi->prob_gf)));
                    }
                }
                // Both last and at least one of alt or golden are enabled
                else if ( check_segref( xd, segment_id, GOLDEN_FRAME ) ||
                          check_segref( xd, segment_id, ALTREF_FRAME ) )
                {
                    // Read flag to indicate (golden or altref) vs last
                    if (vp8_read(bc, pbi->prob_last))
                    {
                        // If not golden then it must be altref
                        if (!check_segref( xd, segment_id, GOLDEN_FRAME ))
                        {
                            ref_frame = ALTREF_FRAME;
                        }
                        // Not Altref therefore must be Golden
                        else if (!check_segref( xd, segment_id,
                                                   ALTREF_FRAME ))
                        {
                            ref_frame = GOLDEN_FRAME;
                        }
                        else
                        {
                            ref_frame = (MV_REFERENCE_FRAME)((int)ref_frame +
                                        (int)(1 + vp8_read(bc, pbi->prob_gf)));
                        }
                    }
                    // ELSE LAST
                }
            }
        }
    }

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    return (MV_REFERENCE_FRAME)ref_frame;
}
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static MB_PREDICTION_MODE read_mv_ref(vp8_reader *bc, const vp8_prob *p)
{
    const int i = vp8_treed_read(bc, vp8_mv_ref_tree, p);

    return (MB_PREDICTION_MODE)i;
}

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static B_PREDICTION_MODE sub_mv_ref(vp8_reader *bc, const vp8_prob *p)
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{
    const int i = vp8_treed_read(bc, vp8_sub_mv_ref_tree, p);

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    return (B_PREDICTION_MODE)i;
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}
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#ifdef VPX_MODE_COUNT
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unsigned int vp8_mv_cont_count[5][4] =
{
    { 0, 0, 0, 0 },
    { 0, 0, 0, 0 },
    { 0, 0, 0, 0 },
    { 0, 0, 0, 0 },
    { 0, 0, 0, 0 }
};
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#endif
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static const unsigned char mbsplit_fill_count[4] = {8, 8, 4, 1};
static const unsigned char mbsplit_fill_offset[4][16] = {
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    { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,  10, 11, 12, 13, 14, 15},
    { 0,  1,  4,  5,  8,  9, 12, 13,  2,  3,   6,  7, 10, 11, 14, 15},
    { 0,  1,  4,  5,  2,  3,  6,  7,  8,  9,  12, 13, 10, 11, 14, 15},
    { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,  10, 11, 12, 13, 14, 15}
};
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static void mb_mode_mv_init(VP8D_COMP *pbi)
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{
    vp8_reader *const bc = & pbi->bc;
    MV_CONTEXT *const mvc = pbi->common.fc.mvc;
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#if CONFIG_ERROR_CONCEALMENT
    /* Default is that no macroblock is corrupt, therefore we initialize
     * mvs_corrupt_from_mb to something very big, which we can be sure is
     * outside the frame. */
    pbi->mvs_corrupt_from_mb = UINT_MAX;
#endif
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    pbi->prob_skip_false = 0;
    if (pbi->common.mb_no_coeff_skip)
        pbi->prob_skip_false = (vp8_prob)vp8_read_literal(bc, 8);
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    if(pbi->common.frame_type != KEY_FRAME)
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    {
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        pbi->prob_intra = (vp8_prob)vp8_read_literal(bc, 8);
        pbi->prob_last  = (vp8_prob)vp8_read_literal(bc, 8);
        pbi->prob_gf    = (vp8_prob)vp8_read_literal(bc, 8);
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#if CONFIG_DUALPRED
        pbi->common.dual_pred_mode = vp8_read(bc, 128);
        if (pbi->common.dual_pred_mode)
            pbi->common.dual_pred_mode += vp8_read(bc, 128);
        if (pbi->common.dual_pred_mode == HYBRID_PREDICTION)
        {
            pbi->prob_dualpred[0] = (vp8_prob)vp8_read_literal(bc, 8);
            pbi->prob_dualpred[1] = (vp8_prob)vp8_read_literal(bc, 8);
            pbi->prob_dualpred[2] = (vp8_prob)vp8_read_literal(bc, 8);
        }
#endif /* CONFIG_DUALPRED */
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        if (vp8_read_bit(bc))
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        {
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            int i = 0;
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            do
            {
                pbi->common.fc.ymode_prob[i] = (vp8_prob) vp8_read_literal(bc, 8);
            }
            while (++i < 4);
        }
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#if CONFIG_UVINTRA
        //vp8_read_bit(bc);
#else
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        if (vp8_read_bit(bc))
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        {
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            int i = 0;

            do
            {
                pbi->common.fc.uv_mode_prob[i] = (vp8_prob) vp8_read_literal(bc, 8);
            }
            while (++i < 3);
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        }
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#endif /* CONFIG_UVINTRA */
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        read_mvcontexts(bc, mvc);
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    }
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}
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static void read_mb_modes_mv(VP8D_COMP *pbi, MODE_INFO *mi, MB_MODE_INFO *mbmi,
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#if CONFIG_NEWNEAR
                             MODE_INFO *prev_mi,
#endif
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                            int mb_row, int mb_col)
{
    vp8_reader *const bc = & pbi->bc;
    MV_CONTEXT *const mvc = pbi->common.fc.mvc;
    const int mis = pbi->common.mode_info_stride;
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    MACROBLOCKD *const xd  = & pbi->mb;
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    int pred_context;
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    int index = mb_row * pbi->common.mb_cols + mb_col;
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    int_mv *const mv = & mbmi->mv;
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    int mb_to_left_edge;
    int mb_to_right_edge;
    int mb_to_top_edge;
    int mb_to_bottom_edge;

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    mb_to_top_edge = xd->mb_to_top_edge;
    mb_to_bottom_edge = xd->mb_to_bottom_edge;
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    mb_to_top_edge -= LEFT_TOP_MARGIN;
    mb_to_bottom_edge += RIGHT_BOTTOM_MARGIN;
    mbmi->need_to_clamp_mvs = 0;
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#if CONFIG_DUALPRED
    mbmi->second_ref_frame = 0;
#endif /* CONFIG_DUALPRED */
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    /* Distance of Mb to the various image edges.
     * These specified to 8th pel as they are always compared to MV values that are in 1/8th pel units
     */
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    xd->mb_to_left_edge =
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    mb_to_left_edge = -((mb_col * 16) << 3);
    mb_to_left_edge -= LEFT_TOP_MARGIN;

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    xd->mb_to_right_edge =
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    mb_to_right_edge = ((pbi->common.mb_cols - 1 - mb_col) * 16) << 3;
    mb_to_right_edge += RIGHT_BOTTOM_MARGIN;

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    /* If required read in new segmentation data for this MB */
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    if (xd->update_mb_segmentation_map)
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    {
        // Is temporal coding of the segment id for this mb enabled.
        if (xd->temporal_update)
        {
            // Work out a context for decoding seg_id_predicted.
            pred_context = 0;
            if (mb_col != 0)
                pred_context += (mi-1)->mbmi.seg_id_predicted;
            if (mb_row != 0)
                pred_context +=
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                    (mi-pbi->common.mode_info_stride)->mbmi.seg_id_predicted;
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            mbmi->seg_id_predicted =
                vp8_read(bc,
                         xd->mb_segment_pred_probs[pred_context]);

            if ( mbmi->seg_id_predicted )
            {
                mbmi->segment_id = pbi->segmentation_map[index];
            }
            // If the segment id was not predicted decode it explicitly
            else
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            {
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                vp8_read_mb_segid(bc, &mi->mbmi, xd);
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                pbi->segmentation_map[index] = mbmi->segment_id;
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            }
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        }
        // Normal unpredicted coding mode
        else
        {
            vp8_read_mb_segid(bc, &mi->mbmi, xd);
            pbi->segmentation_map[index] = mbmi->segment_id;
        }
        index++;

    }

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//#if CONFIG_SEGFEATURES
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    if ( pbi->common.mb_no_coeff_skip &&
         ( !segfeature_active( xd,
                               mbmi->segment_id, SEG_LVL_EOB ) ||
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           (get_segdata( xd, mbmi->segment_id, SEG_LVL_EOB ) != 0) ) )
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    {
        // Read the macroblock coeff skip flag if this feature is in use,
        // else default to 0
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        mbmi->mb_skip_coeff = vp8_read(bc, pbi->prob_skip_false);
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    }
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    else
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    {
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//#if CONFIG_SEGFEATURES
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        if ( segfeature_active( xd,
                                mbmi->segment_id, SEG_LVL_EOB ) &&
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             (get_segdata( xd, mbmi->segment_id, SEG_LVL_EOB ) == 0) )
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        {
            mbmi->mb_skip_coeff = 1;
        }
        else
            mbmi->mb_skip_coeff = 0;
    }
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    // Read the reference frame
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    mbmi->ref_frame = read_ref_frame( pbi, bc, mbmi->segment_id );
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    // If reference frame is an Inter frame
    if (mbmi->ref_frame)
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    {
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        int rct[4];
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        int_mv nearest, nearby, best_mv;
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        vp8_prob mv_ref_p [VP8_MVREFS-1];
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        vp8_find_near_mvs(xd, mi,
#if CONFIG_NEWNEAR
            prev_mi,
#endif
            &nearest, &nearby, &best_mv, rct,
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                          mbmi->ref_frame, pbi->common.ref_frame_sign_bias);
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        vp8_mv_ref_probs(&pbi->common, mv_ref_p, rct);
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//#if CONFIG_SEGFEATURES
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        // Is the segment level mode feature enabled for this segment
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        if ( segfeature_active( xd, mbmi->segment_id, SEG_LVL_MODE ) )
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        {
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            mbmi->mode =
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                get_segdata( xd, mbmi->segment_id, SEG_LVL_MODE );
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        }
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        else
        {
            mbmi->mode = read_mv_ref(bc, mv_ref_p);
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#if CONFIG_NEWNEAR
            vp8_accum_mv_refs(&pbi->common, mbmi->mode, rct);
#endif
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        }
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        mbmi->uv_mode = DC_PRED;
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        switch (mbmi->mode)
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        {
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        case SPLITMV:
        {
            const int s = mbmi->partitioning =
                      vp8_treed_read(bc, vp8_mbsplit_tree, vp8_mbsplit_probs);
            const int num_p = vp8_mbsplit_count [s];
            int j = 0;
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            do  /* for each subset j */
            {
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                int_mv leftmv, abovemv;
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                int_mv blockmv;
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                int k;  /* first block in subset j */
                int mv_contz;
                k = vp8_mbsplit_offset[s][j];
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                leftmv.as_int = left_block_mv(mi, k);
                abovemv.as_int = above_block_mv(mi, k, mis);
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                mv_contz = vp8_mv_cont(&leftmv, &abovemv);
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                switch (sub_mv_ref(bc, vp8_sub_mv_ref_prob2 [mv_contz])) /*pc->fc.sub_mv_ref_prob))*/
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                {
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                case NEW4X4:
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                    read_mv(bc, &blockmv.as_mv, (const MV_CONTEXT *) mvc);
                    blockmv.as_mv.row += best_mv.as_mv.row;
                    blockmv.as_mv.col += best_mv.as_mv.col;
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  #ifdef VPX_MODE_COUNT
                    vp8_mv_cont_count[mv_contz][3]++;
  #endif
                    break;
                case LEFT4X4:
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                    blockmv.as_int = leftmv.as_int;
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  #ifdef VPX_MODE_COUNT
                    vp8_mv_cont_count[mv_contz][0]++;
  #endif
                    break;
                case ABOVE4X4:
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                    blockmv.as_int = abovemv.as_int;
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  #ifdef VPX_MODE_COUNT
                    vp8_mv_cont_count[mv_contz][1]++;
  #endif
                    break;
                case ZERO4X4:
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                    blockmv.as_int = 0;
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  #ifdef VPX_MODE_COUNT
                    vp8_mv_cont_count[mv_contz][2]++;
  #endif
                    break;
                default:
                    break;
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                }

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                mbmi->need_to_clamp_mvs = vp8_check_mv_bounds(&blockmv,
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                                                          mb_to_left_edge,
                                                          mb_to_right_edge,
                                                          mb_to_top_edge,
                                                          mb_to_bottom_edge);
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                {
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                    /* Fill (uniform) modes, mvs of jth subset.
                     Must do it here because ensuing subsets can
                     refer back to us via "left" or "above". */
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                    const unsigned char *fill_offset;
                    unsigned int fill_count = mbsplit_fill_count[s];
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                    fill_offset = &mbsplit_fill_offset[s][(unsigned char)j * mbsplit_fill_count[s]];
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                    do {
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                        mi->bmi[ *fill_offset].mv.as_int = blockmv.as_int;
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                        fill_offset++;
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                    }while (--fill_count);
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                }

            }
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            while (++j < num_p);
        }
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        mv->as_int = mi->bmi[15].mv.as_int;
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        break;  /* done with SPLITMV */

        case NEARMV:
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            mv->as_int = nearby.as_int;
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            /* Clip "next_nearest" so that it does not extend to far out of image */
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            vp8_clamp_mv(mv, mb_to_left_edge, mb_to_right_edge,
                         mb_to_top_edge, mb_to_bottom_edge);
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            goto propagate_mv;
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        case NEARESTMV:
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            mv->as_int = nearest.as_int;
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            /* Clip "next_nearest" so that it does not extend to far out of image */
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            vp8_clamp_mv(mv, mb_to_left_edge, mb_to_right_edge,
                         mb_to_top_edge, mb_to_bottom_edge);
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            goto propagate_mv;
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        case ZEROMV:
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            mv->as_int = 0;
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            goto propagate_mv;
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        case NEWMV:
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            read_mv(bc, &mv->as_mv, (const MV_CONTEXT *) mvc);
            mv->as_mv.row += best_mv.as_mv.row;
            mv->as_mv.col += best_mv.as_mv.col;
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            /* Don't need to check this on NEARMV and NEARESTMV modes
             * since those modes clamp the MV. The NEWMV mode does not,
             * so signal to the prediction stage whether special
             * handling may be required.
             */
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            mbmi->need_to_clamp_mvs = vp8_check_mv_bounds(mv,
                                                      mb_to_left_edge,
                                                      mb_to_right_edge,
                                                      mb_to_top_edge,
                                                      mb_to_bottom_edge);
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        propagate_mv:  /* same MV throughout */
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#if CONFIG_DUALPRED
            if (pbi->common.dual_pred_mode == DUAL_PREDICTION_ONLY ||
                (pbi->common.dual_pred_mode == HYBRID_PREDICTION &&
                 vp8_read(bc, pbi->prob_dualpred[(mi[-1].mbmi.second_ref_frame != INTRA_FRAME) +
                                                 (mi[-mis].mbmi.second_ref_frame != INTRA_FRAME)])))
            {
                mbmi->second_ref_frame = mbmi->ref_frame + 1;
                if (mbmi->second_ref_frame == 4)
                    mbmi->second_ref_frame = 1;
            }
            if (mbmi->second_ref_frame)
            {
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                vp8_find_near_mvs(xd, mi,
#if CONFIG_NEWNEAR
                                  prev_mi,
#endif
                                  &nearest, &nearby, &best_mv, rct,
                                  (int)mbmi->second_ref_frame,
                                  pbi->common.ref_frame_sign_bias);
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                switch (mbmi->mode) {
                case ZEROMV:
                    mbmi->second_mv.as_int = 0;
                    break;
                case NEARMV:
                    mbmi->second_mv.as_int = nearby.as_int;
                    vp8_clamp_mv(&mbmi->second_mv, mb_to_left_edge, mb_to_right_edge,
                                 mb_to_top_edge, mb_to_bottom_edge);
                    break;
                case NEARESTMV:
                    mbmi->second_mv.as_int = nearest.as_int;
                    vp8_clamp_mv(&mbmi->second_mv, mb_to_left_edge, mb_to_right_edge,
                                 mb_to_top_edge, mb_to_bottom_edge);
                    break;
                case NEWMV:
                    read_mv(bc, &mbmi->second_mv.as_mv, (const MV_CONTEXT *) mvc);
                    mbmi->second_mv.as_mv.row += best_mv.as_mv.row;
                    mbmi->second_mv.as_mv.col += best_mv.as_mv.col;
                    mbmi->need_to_clamp_mvs |= vp8_check_mv_bounds(&mbmi->second_mv,
                                                                   mb_to_left_edge,
                                                                   mb_to_right_edge,
                                                                   mb_to_top_edge,
                                                                   mb_to_bottom_edge);
                    break;
                default:
                    break;
                }
            }
#endif /* CONFIG_DUALPRED */

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#if CONFIG_ERROR_CONCEALMENT
            if(pbi->ec_enabled)
            {
                mi->bmi[ 0].mv.as_int =
                mi->bmi[ 1].mv.as_int =
                mi->bmi[ 2].mv.as_int =
                mi->bmi[ 3].mv.as_int =
                mi->bmi[ 4].mv.as_int =
                mi->bmi[ 5].mv.as_int =
                mi->bmi[ 6].mv.as_int =
                mi->bmi[ 7].mv.as_int =
                mi->bmi[ 8].mv.as_int =
                mi->bmi[ 9].mv.as_int =
                mi->bmi[10].mv.as_int =
                mi->bmi[11].mv.as_int =
                mi->bmi[12].mv.as_int =
                mi->bmi[13].mv.as_int =
                mi->bmi[14].mv.as_int =
                mi->bmi[15].mv.as_int = mv->as_int;
            }
#endif
            break;
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        default:;
  #if CONFIG_DEBUG
            assert(0);
  #endif
        }
    }
    else
    {
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        /* required for left and above block mv */
        mbmi->mv.as_int = 0;
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//#if CONFIG_SEGFEATURES
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        if ( segfeature_active( xd, mbmi->segment_id, SEG_LVL_MODE ) )
            mbmi->mode = (MB_PREDICTION_MODE)
                         get_segdata( xd, mbmi->segment_id, SEG_LVL_MODE );
        else
        {
            mbmi->mode = (MB_PREDICTION_MODE)
                         vp8_read_ymode(bc, pbi->common.fc.ymode_prob);
        }

        // If MB mode is BPRED read the block modes
        if (mbmi->mode == B_PRED)
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        {
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            int j = 0;
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            do
            {
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                mi->bmi[j].as_mode = (B_PREDICTION_MODE)vp8_read_bmode(bc, pbi->common.fc.bmode_prob);
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            }
            while (++j < 16);
        }
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        if(mbmi->mode == I8X8_PRED)
        {
            int i;
            int mode8x8;
            for(i=0;i<4;i++)
            {
                int ib = vp8_i8x8_block[i];
                mode8x8 = vp8_read_i8x8_mode(bc, pbi->common.i8x8_mode_prob);
                mi->bmi[ib+0].as_mode= mode8x8;
                mi->bmi[ib+1].as_mode= mode8x8;
                mi->bmi[ib+4].as_mode= mode8x8;
                mi->bmi[ib+5].as_mode= mode8x8;
            }
        }
        else
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#if CONFIG_UVINTRA
            mbmi->uv_mode = (MB_PREDICTION_MODE)vp8_read_uv_mode(bc,
                                    pbi->common.fc.uv_mode_prob[mbmi->mode]);
#else
            mbmi->uv_mode = (MB_PREDICTION_MODE)vp8_read_uv_mode(bc,
                                    pbi->common.fc.uv_mode_prob);
#endif /*CONFIG_UVINTRA*/
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    }
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}
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void vp8_decode_mode_mvs(VP8D_COMP *pbi)
{
    MODE_INFO *mi = pbi->common.mi;
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#if CONFIG_NEWNEAR
    MODE_INFO *prev_mi = pbi->common.prev_mi;
#endif

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    int mb_row = -1;
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//#if CONFIG_SEGFEATURES
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#if 0
    FILE *statsfile;
    statsfile = fopen("decsegmap.stt", "a");
    fprintf(statsfile, "\n" );
#endif

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    mb_mode_mv_init(pbi);
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#if CONFIG_QIMODE
    if(pbi->common.frame_type==KEY_FRAME && !pbi->common.kf_ymode_probs_update)
    {
        pbi->common.kf_ymode_probs_index = vp8_read_literal(&pbi->bc, 3);
    }
#endif

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    while (++mb_row < pbi->common.mb_rows)
    {
        int mb_col = -1;
        int mb_to_top_edge;
        int mb_to_bottom_edge;
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        pbi->mb.mb_to_top_edge =
        mb_to_top_edge = -((mb_row * 16)) << 3;
        mb_to_top_edge -= LEFT_TOP_MARGIN;
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        pbi->mb.mb_to_bottom_edge =
        mb_to_bottom_edge = ((pbi->common.mb_rows - 1 - mb_row) * 16) << 3;
        mb_to_bottom_edge += RIGHT_BOTTOM_MARGIN;
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//#if CONFIG_SEGFEATURES
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#if 0
        fprintf(statsfile, "\n" );
#endif

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        while (++mb_col < pbi->common.mb_cols)
        {
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#if CONFIG_ERROR_CONCEALMENT
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            int mb_num = mb_row * pbi->common.mb_cols + mb_col;
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#endif
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            /*read_mb_modes_mv(pbi, xd->mode_info_context, &xd->mode_info_context->mbmi, mb_row, mb_col);*/
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            if(pbi->common.frame_type == KEY_FRAME)
                vp8_kfread_modes(pbi, mi, mb_row, mb_col);
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            else
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                read_mb_modes_mv(pbi, mi, &mi->mbmi,
#if CONFIG_NEWNEAR
                prev_mi,
#endif
                mb_row, mb_col);
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            //printf("%3d", mi->mbmi.mode);

            /*
            if(pbi->common.current_video_frame==7)
            {
                FILE *fmode=fopen("kfmode.txt", "a");
                fprintf(fmode, "%3d:%3d:%d\n",mb_row, mb_col, mi->mbmi.mode);
                fclose(fmode);

            }*/
            /*
            if(mi->mbmi.mode==I8X8_PRED)
            {
                printf("F%3d:%d:%d\n", pbi->common.current_video_frame, mb_row, mb_col);
            }
            */
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#if CONFIG_ERROR_CONCEALMENT
            /* look for corruption. set mvs_corrupt_from_mb to the current
             * mb_num if the frame is corrupt from this macroblock. */
            if (vp8dx_bool_error(&pbi->bc) && mb_num < pbi->mvs_corrupt_from_mb)
            {
                pbi->mvs_corrupt_from_mb = mb_num;
                /* no need to continue since the partition is corrupt from
                 * here on.
                 */
                return;
            }
#endif

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//#if CONFIG_SEGFEATURES
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#if 0
            fprintf(statsfile, "%2d%2d%2d   ",
                mi->mbmi.segment_id, mi->mbmi.ref_frame, mi->mbmi.mode );
#endif
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#if CONFIG_NEWNEAR
            prev_mi++;
#endif
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            mi++;       /* next macroblock */
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        }
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       // printf("\n");
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#if CONFIG_NEWNEAR
        prev_mi++;
#endif
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        mi++;           /* skip left predictor each row */
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    }
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//#if CONFIG_SEGFEATURES
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#if 0
    fclose(statsfile);
#endif
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}