motion_est.c

ffmpeg的完整源代码和作者自己写的文档。不但有在Linux的工程哦

            c->scene_change_score+= ff_sqrt(p_score) - ff_sqrt(i_score);
        }
    }

    s->mb_type[mb_y*s->mb_stride + mb_x]= mb_type;
}

int ff_pre_estimate_p_frame_motion(MpegEncContext * s,
                                    int mb_x, int mb_y)
{
    MotionEstContext * const c= &s->me;
    int mx, my, dmin;
    int P[10][2];
    const int shift= 1+s->quarter_sample;
    const int xy= mb_x + mb_y*s->mb_stride;
    init_ref(c, s->new_picture.data, s->last_picture.data, NULL, 16*mb_x, 16*mb_y, 0);

    assert(s->quarter_sample==0 || s->quarter_sample==1);

    c->pre_penalty_factor    = get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_pre_cmp);
    c->current_mv_penalty= c->mv_penalty[s->f_code] + MAX_MV;

    get_limits(s, 16*mb_x, 16*mb_y);
    c->skip=0;

    P_LEFT[0]       = s->p_mv_table[xy + 1][0];
    P_LEFT[1]       = s->p_mv_table[xy + 1][1];

    if(P_LEFT[0]       < (c->xmin<<shift)) P_LEFT[0]       = (c->xmin<<shift);

    /* special case for first line */
    if (s->first_slice_line) {
        c->pred_x= P_LEFT[0];
        c->pred_y= P_LEFT[1];
        P_TOP[0]= P_TOPRIGHT[0]= P_MEDIAN[0]=
        P_TOP[1]= P_TOPRIGHT[1]= P_MEDIAN[1]= 0; //FIXME
    } else {
        P_TOP[0]      = s->p_mv_table[xy + s->mb_stride    ][0];
        P_TOP[1]      = s->p_mv_table[xy + s->mb_stride    ][1];
        P_TOPRIGHT[0] = s->p_mv_table[xy + s->mb_stride - 1][0];
        P_TOPRIGHT[1] = s->p_mv_table[xy + s->mb_stride - 1][1];
        if(P_TOP[1]      < (c->ymin<<shift)) P_TOP[1]     = (c->ymin<<shift);
        if(P_TOPRIGHT[0] > (c->xmax<<shift)) P_TOPRIGHT[0]= (c->xmax<<shift);
        if(P_TOPRIGHT[1] < (c->ymin<<shift)) P_TOPRIGHT[1]= (c->ymin<<shift);

        P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
        P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);

        c->pred_x = P_MEDIAN[0];
        c->pred_y = P_MEDIAN[1];
    }

    dmin = ff_epzs_motion_search(s, &mx, &my, P, 0, 0, s->p_mv_table, (1<<16)>>shift, 0, 16);

    s->p_mv_table[xy][0] = mx<<shift;
    s->p_mv_table[xy][1] = my<<shift;

    return dmin;
}

static int ff_estimate_motion_b(MpegEncContext * s,
                       int mb_x, int mb_y, int16_t (*mv_table)[2], int ref_index, int f_code)
{
    MotionEstContext * const c= &s->me;
    int mx, my, dmin;
    int P[10][2];
    const int shift= 1+s->quarter_sample;
    const int mot_stride = s->mb_stride;
    const int mot_xy = mb_y*mot_stride + mb_x;
    uint8_t * const mv_penalty= c->mv_penalty[f_code] + MAX_MV;
    int mv_scale;

    c->penalty_factor    = get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_cmp);
    c->sub_penalty_factor= get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_sub_cmp);
    c->mb_penalty_factor = get_penalty_factor(s->lambda, s->lambda2, c->avctx->mb_cmp);
    c->current_mv_penalty= mv_penalty;

    get_limits(s, 16*mb_x, 16*mb_y);

    switch(s->me_method) {
    case ME_ZERO:
    default:
        no_motion_search(s, &mx, &my);
        dmin = 0;
        mx-= mb_x*16;
        my-= mb_y*16;
        break;
#if 0
    case ME_FULL:
        dmin = full_motion_search(s, &mx, &my, range, ref_picture);
        mx-= mb_x*16;
        my-= mb_y*16;
        break;
    case ME_LOG:
        dmin = log_motion_search(s, &mx, &my, range / 2, ref_picture);
        mx-= mb_x*16;
        my-= mb_y*16;
        break;
    case ME_PHODS:
        dmin = phods_motion_search(s, &mx, &my, range / 2, ref_picture);
        mx-= mb_x*16;
        my-= mb_y*16;
        break;
#endif
    case ME_X1:
    case ME_EPZS:
       {
            P_LEFT[0]        = mv_table[mot_xy - 1][0];
            P_LEFT[1]        = mv_table[mot_xy - 1][1];

            if(P_LEFT[0]       > (c->xmax<<shift)) P_LEFT[0]       = (c->xmax<<shift);

            /* special case for first line */
            if (!s->first_slice_line) {
                P_TOP[0] = mv_table[mot_xy - mot_stride             ][0];
                P_TOP[1] = mv_table[mot_xy - mot_stride             ][1];
                P_TOPRIGHT[0] = mv_table[mot_xy - mot_stride + 1         ][0];
                P_TOPRIGHT[1] = mv_table[mot_xy - mot_stride + 1         ][1];
                if(P_TOP[1] > (c->ymax<<shift)) P_TOP[1]= (c->ymax<<shift);
                if(P_TOPRIGHT[0] < (c->xmin<<shift)) P_TOPRIGHT[0]= (c->xmin<<shift);
                if(P_TOPRIGHT[1] > (c->ymax<<shift)) P_TOPRIGHT[1]= (c->ymax<<shift);

                P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
                P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);
            }
            c->pred_x= P_LEFT[0];
            c->pred_y= P_LEFT[1];
        }

        if(mv_table == s->b_forw_mv_table){
            mv_scale= (s->pb_time<<16) / (s->pp_time<<shift);
        }else{
            mv_scale= ((s->pb_time - s->pp_time)<<16) / (s->pp_time<<shift);
        }

        dmin = ff_epzs_motion_search(s, &mx, &my, P, 0, ref_index, s->p_mv_table, mv_scale, 0, 16);

        break;
    }

    dmin= c->sub_motion_search(s, &mx, &my, dmin, 0, ref_index, 0, 16);

    if(c->avctx->me_sub_cmp != c->avctx->mb_cmp && !c->skip)
        dmin= ff_get_mb_score(s, mx, my, 0, ref_index, 0, 16, 1);

//printf("%d %d %d %d//", s->mb_x, s->mb_y, mx, my);
//    s->mb_type[mb_y*s->mb_width + mb_x]= mb_type;
    mv_table[mot_xy][0]= mx;
    mv_table[mot_xy][1]= my;

    return dmin;
}

static inline int check_bidir_mv(MpegEncContext * s,
                   int motion_fx, int motion_fy,
                   int motion_bx, int motion_by,
                   int pred_fx, int pred_fy,
                   int pred_bx, int pred_by,
                   int size, int h)
{
    //FIXME optimize?
    //FIXME better f_code prediction (max mv & distance)
    //FIXME pointers
    MotionEstContext * const c= &s->me;
    uint8_t * const mv_penalty_f= c->mv_penalty[s->f_code] + MAX_MV; // f_code of the prev frame
    uint8_t * const mv_penalty_b= c->mv_penalty[s->b_code] + MAX_MV; // f_code of the prev frame
    int stride= c->stride;
    uint8_t *dest_y = c->scratchpad;
    uint8_t *ptr;
    int dxy;
    int src_x, src_y;
    int fbmin;
    uint8_t **src_data= c->src[0];
    uint8_t **ref_data= c->ref[0];
    uint8_t **ref2_data= c->ref[2];

    if(s->quarter_sample){
        dxy = ((motion_fy & 3) << 2) | (motion_fx & 3);
        src_x = motion_fx >> 2;
        src_y = motion_fy >> 2;

        ptr = ref_data[0] + (src_y * stride) + src_x;
        s->dsp.put_qpel_pixels_tab[0][dxy](dest_y    , ptr    , stride);

        dxy = ((motion_by & 3) << 2) | (motion_bx & 3);
        src_x = motion_bx >> 2;
        src_y = motion_by >> 2;

        ptr = ref2_data[0] + (src_y * stride) + src_x;
        s->dsp.avg_qpel_pixels_tab[size][dxy](dest_y    , ptr    , stride);
    }else{
        dxy = ((motion_fy & 1) << 1) | (motion_fx & 1);
        src_x = motion_fx >> 1;
        src_y = motion_fy >> 1;

        ptr = ref_data[0] + (src_y * stride) + src_x;
        s->dsp.put_pixels_tab[size][dxy](dest_y    , ptr    , stride, h);

        dxy = ((motion_by & 1) << 1) | (motion_bx & 1);
        src_x = motion_bx >> 1;
        src_y = motion_by >> 1;

        ptr = ref2_data[0] + (src_y * stride) + src_x;
        s->dsp.avg_pixels_tab[size][dxy](dest_y    , ptr    , stride, h);
    }

    fbmin = (mv_penalty_f[motion_fx-pred_fx] + mv_penalty_f[motion_fy-pred_fy])*c->mb_penalty_factor
           +(mv_penalty_b[motion_bx-pred_bx] + mv_penalty_b[motion_by-pred_by])*c->mb_penalty_factor
           + s->dsp.mb_cmp[size](s, src_data[0], dest_y, stride, h); //FIXME new_pic

    if(c->avctx->mb_cmp&FF_CMP_CHROMA){
    }
    //FIXME CHROMA !!!

    return fbmin;
}

/* refine the bidir vectors in hq mode and return the score in both lq & hq mode*/
static inline int bidir_refine(MpegEncContext * s, int mb_x, int mb_y)
{
    MotionEstContext * const c= &s->me;
    const int mot_stride = s->mb_stride;
    const int xy = mb_y *mot_stride + mb_x;
    int fbmin;
    int pred_fx= s->b_bidir_forw_mv_table[xy-1][0];
    int pred_fy= s->b_bidir_forw_mv_table[xy-1][1];
    int pred_bx= s->b_bidir_back_mv_table[xy-1][0];
    int pred_by= s->b_bidir_back_mv_table[xy-1][1];
    int motion_fx= s->b_bidir_forw_mv_table[xy][0]= s->b_forw_mv_table[xy][0];
    int motion_fy= s->b_bidir_forw_mv_table[xy][1]= s->b_forw_mv_table[xy][1];
    int motion_bx= s->b_bidir_back_mv_table[xy][0]= s->b_back_mv_table[xy][0];
    int motion_by= s->b_bidir_back_mv_table[xy][1]= s->b_back_mv_table[xy][1];
    const int flags= c->sub_flags;
    const int qpel= flags&FLAG_QPEL;
    const int shift= 1+qpel;
    const int xmin= c->xmin<<shift;
    const int ymin= c->ymin<<shift;
    const int xmax= c->xmax<<shift;
    const int ymax= c->ymax<<shift;
    uint8_t map[8][8][8][8];

    memset(map,0,sizeof(map));
#define BIDIR_MAP(fx,fy,bx,by) \
    map[(motion_fx+fx)&7][(motion_fy+fy)&7][(motion_bx+bx)&7][(motion_by+by)&7]
    BIDIR_MAP(0,0,0,0) = 1;

    fbmin= check_bidir_mv(s, motion_fx, motion_fy,
                          motion_bx, motion_by,
                          pred_fx, pred_fy,
                          pred_bx, pred_by,
                          0, 16);

    if(s->avctx->bidir_refine){
        int score, end;
#define CHECK_BIDIR(fx,fy,bx,by)\
    if( !BIDIR_MAP(fx,fy,bx,by)\
       &&(fx<=0 || motion_fx+fx<=xmax) && (fy<=0 || motion_fy+fy<=ymax) && (bx<=0 || motion_bx+bx<=xmax) && (by<=0 || motion_by+by<=ymax)\
       &&(fx>=0 || motion_fx+fx>=xmin) && (fy>=0 || motion_fy+fy>=ymin) && (bx>=0 || motion_bx+bx>=xmin) && (by>=0 || motion_by+by>=ymin)){\
        BIDIR_MAP(fx,fy,bx,by) = 1;\
        score= check_bidir_mv(s, motion_fx+fx, motion_fy+fy, motion_bx+bx, motion_by+by, pred_fx, pred_fy, pred_bx, pred_by, 0, 16);\
        if(score < fbmin){\
            fbmin= score;\
            motion_fx+=fx;\
            motion_fy+=fy;\
            motion_bx+=bx;\
            motion_by+=by;\
            end=0;\
        }\
    }
#define CHECK_BIDIR2(a,b,c,d)\
CHECK_BIDIR(a,b,c,d)\
CHECK_BIDIR(-(a),-(b),-(c),-(d))

#define CHECK_BIDIRR(a,b,c,d)\
CHECK_BIDIR2(a,b,c,d)\
CHECK_BIDIR2(b,c,d,a)\
CHECK_BIDIR2(c,d,a,b)\
CHECK_BIDIR2(d,a,b,c)

        do{
            end=1;

            CHECK_BIDIRR( 0, 0, 0, 1)
            if(s->avctx->bidir_refine > 1){
                CHECK_BIDIRR( 0, 0, 1, 1)
                CHECK_BIDIR2( 0, 1, 0, 1)
                CHECK_BIDIR2( 1, 0, 1, 0)
                CHECK_BIDIRR( 0, 0,-1, 1)
                CHECK_BIDIR2( 0,-1, 0, 1)
                CHECK_BIDIR2(-1, 0, 1, 0)
                if(s->avctx->bidir_refine > 2){
                    CHECK_BIDIRR( 0, 1, 1, 1)
                    CHECK_BIDIRR( 0,-1, 1, 1)
                    CHECK_BIDIRR( 0, 1,-1, 1)
                    CHECK_BIDIRR( 0, 1, 1,-1)
                    if(s->avctx->bidir_refine > 3){
                        CHECK_BIDIR2( 1, 1, 1, 1)
                        CHECK_BIDIRR( 1, 1, 1,-1)
                        CHECK_BIDIR2( 1, 1,-1,-1)
                        CHECK_BIDIR2( 1,-1,-1, 1)
                        CHECK_BIDIR2( 1,-1, 1,-1)
                    }
                }
            }
        }while(!end);
    }

    s->b_bidir_forw_mv_table[xy][0]= motion_fx;
    s->b_bidir_forw_mv_table[xy][1]= motion_fy;
    s->b_bidir_back_mv_table[xy][0]= motion_bx;
    s->b_bidir_back_mv_table[xy][1]= motion_by;

    return fbmin;
}

static inline int direct_search(MpegEncContext * s, int mb_x, int mb_y)
{
    MotionEstContext * const c= &s->me;
    int P[10][2];
    const int mot_stride = s->mb_stride;
    const int mot_xy = mb_y*mot_stride + mb_x;
    const int shift= 1+s->quarter_sample;
    int dmin, i;
    const int time_pp= s->pp_time;
    const int time_pb= s->pb_time;
    int mx, my, xmin, xmax, ymin, ymax;
    int16_t (*mv_table)[2]= s->b_direct_mv_table;

    c->current_mv_penalty= c->mv_penalty[1] + MAX_MV;
    ymin= xmin=(-32)>>shift;
    ymax= xmax=   31>>shift;

    if(IS_8X8(s->next_picture.mb_type[mot_xy])){
        s->mv_type= MV_TYPE_8X8;
    }else{
        s->mv_type= MV_TYPE_16X16;
    }

    for(i=0; i<4; i++){
        int index= s->block_index[i];
        int min, max;

        c->co_located_mv[i][0]= s->next_picture.motion_val[0][index][0];
        c->co_located_mv[i][1]= s->next_picture.motion_val[0][index][1];
        c->direct_basis_mv[i][0]= c->co_located_mv[i][0]*time_pb/time_pp + ((i& 1)<<(shift+3));
        c->direct_basis_mv[i][1]= c->co_located_mv[i][1]*time_pb/time_pp + ((i>>1)<<(shift+3));
//        c->direct_basis_mv[1][i][0]= c->co_located_mv[i][0]*(time_pb - time_pp)/time_pp + ((i &1)<<(shift+3);
//        c->direct_basis_mv[1][i][1]= c->co_located_mv[i][1]*(time_pb - time_pp)/time_pp + ((i>>1)<<(shift+3);

        max= FFMAX(c->direct_basis_mv[i][0], c->direct_basis_mv[i][0] - c->co_located_mv[i][0])>>shift;
        min= FFMIN(c->