/*!
 *************************************************************************************
 * \file mv-search.c
 *
 * \brief
 *    Motion Vector Search, unified for B and P Pictures
 *
 * \author
 *    Main contributors (see contributors.h for copyright, address and affiliation details)
 *      - Stephan Wenger                  <stewe@cs.tu-berlin.de>
 *      - Inge Lille-Lang鴜               <inge.lille-langoy@telenor.com>
 *      - Rickard Sjoberg                 <rickard.sjoberg@era.ericsson.se>
 *      - Stephan Wenger                  <stewe@cs.tu-berlin.de>
 *      - Jani Lainema                    <jani.lainema@nokia.com>
 *      - Detlev Marpe                    <marpe@hhi.de>
 *      - Thomas Wedi                     <wedi@tnt.uni-hannover.de>
 *      - Heiko Schwarz                   <hschwarz@hhi.de>
 *
 *************************************************************************************
*/

#include "contributors.h"

#include <math.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>

#include "global.h"
#include "image.h"
#include "mv-search.h"
#include "refbuf.h"
#include "memalloc.h"
#include "mb_access.h"
#include "fast_me.h"

#include <time.h>
#include <sys/timeb.h>

// These procedure pointers are used by motion_search() and one_eigthpel()
static pel_t  (*PelY_14)     (pel_t**, int, int, int, int);
static pel_t *(*PelYline_11) (pel_t *, int, int, int, int);

// Statistics, temporary
int     max_mvd;
int*    spiral_search_x;
int*    spiral_search_y;
int*    mvbits;
int*    refbits;
int*    byte_abs;
int**** motion_cost;


void SetMotionVectorPredictor (int  pmv[2],
                               int  ***refPic,
                               int  ****tmp_mv,
                               int  ref_frame,
                               int  list,
                               int  block_x,
                               int  block_y,
                               int  blockshape_x,
                               int  blockshape_y);

#ifdef _FAST_FULL_ME_

/*****
 *****  static variables for fast integer motion estimation
 *****
 */
static int  **search_setup_done;  //!< flag if all block SAD's have been calculated yet
static int  **search_center_x;    //!< absolute search center for fast full motion search
static int  **search_center_y;    //!< absolute search center for fast full motion search
static int  **pos_00;             //!< position of (0,0) vector
static int  *****BlockSAD;        //!< SAD for all blocksize, ref. frames and motion vectors
static int  **max_search_range;

extern ColocatedParams *Co_located;

/*!
 ***********************************************************************
 * \brief
 *    function creating arrays for fast integer motion estimation
 ***********************************************************************
 */
void
InitializeFastFullIntegerSearch ()
{
  int  i, j, k, list;
  int  search_range = input->search_range;
  int  max_pos      = (2*search_range+1) * (2*search_range+1);

  if ((BlockSAD = (int*****)malloc (2 * sizeof(int****))) == NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: BlockSAD");

  for (list=0; list<2;list++)
  {
    if ((BlockSAD[list] = (int****)malloc ((img->max_num_references+1) * sizeof(int***))) == NULL)
      no_mem_exit ("InitializeFastFullIntegerSearch: BlockSAD");
    for (i = 0; i <= img->max_num_references; i++)
    {
      if ((BlockSAD[list][i] = (int***)malloc (8 * sizeof(int**))) == NULL)
        no_mem_exit ("InitializeFastFullIntegerSearch: BlockSAD");
      for (j = 1; j < 8; j++)
      {
        if ((BlockSAD[list][i][j] = (int**)malloc (16 * sizeof(int*))) == NULL)
          no_mem_exit ("InitializeFastFullIntegerSearch: BlockSAD");
        for (k = 0; k < 16; k++)
        {
          if ((BlockSAD[list][i][j][k] = (int*)malloc (max_pos * sizeof(int))) == NULL)
            no_mem_exit ("InitializeFastFullIntegerSearch: BlockSAD");
        }
      }
    }
  }

  if ((search_setup_done = (int**)malloc (2*sizeof(int)))==NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: search_setup_done");
  if ((search_center_x = (int**)malloc (2*sizeof(int)))==NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: search_center_x");
  if ((search_center_y = (int**)malloc (2*sizeof(int)))==NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: search_center_y");
  if ((pos_00 = (int**)malloc (2*sizeof(int)))==NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: pos_00");
  if ((max_search_range = (int**)malloc (2*sizeof(int)))==NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: max_search_range");

  for (list=0; list<2; list++)
  {
  if ((search_setup_done[list] = (int*)malloc ((img->max_num_references+1)*sizeof(int)))==NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: search_setup_done");
  if ((search_center_x[list] = (int*)malloc ((img->max_num_references+1)*sizeof(int)))==NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: search_center_x");
  if ((search_center_y[list] = (int*)malloc ((img->max_num_references+1)*sizeof(int)))==NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: search_center_y");
  if ((pos_00[list] = (int*)malloc ((img->max_num_references+1)*sizeof(int)))==NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: pos_00");
  if ((max_search_range[list] = (int*)malloc ((img->max_num_references+1)*sizeof(int)))==NULL)
    no_mem_exit ("InitializeFastFullIntegerSearch: max_search_range");
  }

  // assign max search ranges for reference frames
  if (input->full_search == 2)
  {
    for (list=0;list<2;list++)
      for (i=0; i<=img->max_num_references; i++)  
        max_search_range[list][i] = search_range;
  }
  else
  {
    for (list=0;list<2;list++)
    {
      max_search_range[list][0] = max_search_range[list][img->max_num_references] = search_range;
      for (i=1; i< img->max_num_references; i++)  max_search_range[list][i] = search_range / 2;
    }
  }

}



/*!
 ***********************************************************************
 * \brief
 *    function for deleting the arrays for fast integer motion estimation
 ***********************************************************************
 */
void
ClearFastFullIntegerSearch ()
{
  int  i, j, k, list;

  for (list=0; list<2; list++)
  {
    for (i = 0; i <= img->max_num_references; i++)
    {
      for (j = 1; j < 8; j++)
      {
        for (k = 0; k < 16; k++)
        {
          free (BlockSAD[list][i][j][k]);
        }
        free (BlockSAD[list][i][j]);
      }
      free (BlockSAD[list][i]);
    }
    free (BlockSAD[list]);
  }
  free (BlockSAD);

  for (list=0; list<2; list++)
  {
    free (search_setup_done[list]);
    free (search_center_x[list]);
    free (search_center_y[list]);
    free (pos_00[list]);
    free (max_search_range[list]);
  }
  free (search_setup_done);
  free (search_center_x);
  free (search_center_y);
  free (pos_00);
  free (max_search_range);

}


/*!
 ***********************************************************************
 * \brief
 *    function resetting flags for fast integer motion estimation
 *    (have to be called in start_macroblock())
 ***********************************************************************
 */
void
ResetFastFullIntegerSearch ()
{
  int i,list;

  for (list=0; list<2; list++)
    for (i = 0; i <= img->max_num_references; i++)
      search_setup_done [list][i] = 0;
}

/*!
 ***********************************************************************
 * \brief
 *    calculation of SAD for larger blocks on the basis of 4x4 blocks
 ***********************************************************************
 */
void
SetupLargerBlocks (int list, int refindex, int max_pos)
{
#define ADD_UP_BLOCKS()   _o=*_bo; _i=*_bi; _j=*_bj; for(pos=0;pos<max_pos;pos++) _o[pos] = _i[pos] + _j[pos];
#define INCREMENT(inc)    _bo+=inc; _bi+=inc; _bj+=inc;

  int    pos, **_bo, **_bi, **_bj;
  register int *_o,   *_i,   *_j;

  //--- blocktype 6 ---
  _bo = BlockSAD[list][refindex][6];
  _bi = BlockSAD[list][refindex][7];
  _bj = _bi + 4;
  ADD_UP_BLOCKS(); INCREMENT(1);
  ADD_UP_BLOCKS(); INCREMENT(1);
  ADD_UP_BLOCKS(); INCREMENT(1);
  ADD_UP_BLOCKS(); INCREMENT(5);
  ADD_UP_BLOCKS(); INCREMENT(1);
  ADD_UP_BLOCKS(); INCREMENT(1);
  ADD_UP_BLOCKS(); INCREMENT(1);
  ADD_UP_BLOCKS();

  //--- blocktype 5 ---
  _bo = BlockSAD[list][refindex][5];
  _bi = BlockSAD[list][refindex][7];
  _bj = _bi + 1;
  ADD_UP_BLOCKS(); INCREMENT(2);
  ADD_UP_BLOCKS(); INCREMENT(2);
  ADD_UP_BLOCKS(); INCREMENT(2);
  ADD_UP_BLOCKS(); INCREMENT(2);
  ADD_UP_BLOCKS(); INCREMENT(2);
  ADD_UP_BLOCKS(); INCREMENT(2);
  ADD_UP_BLOCKS(); INCREMENT(2);
  ADD_UP_BLOCKS();

  //--- blocktype 4 ---
  _bo = BlockSAD[list][refindex][4];
  _bi = BlockSAD[list][refindex][6];
  _bj = _bi + 1;
  ADD_UP_BLOCKS(); INCREMENT(2);
  ADD_UP_BLOCKS(); INCREMENT(6);
  ADD_UP_BLOCKS(); INCREMENT(2);
  ADD_UP_BLOCKS();

  //--- blocktype 3 ---
  _bo = BlockSAD[list][refindex][3];
  _bi = BlockSAD[list][refindex][4];
  _bj = _bi + 8;
  ADD_UP_BLOCKS(); INCREMENT(2);
  ADD_UP_BLOCKS();

  //--- blocktype 2 ---
  _bo = BlockSAD[list][refindex][2];
  _bi = BlockSAD[list][refindex][4];
  _bj = _bi + 2;
  ADD_UP_BLOCKS(); INCREMENT(8);
  ADD_UP_BLOCKS();

  //--- blocktype 1 ---
  _bo = BlockSAD[list][refindex][1];
  _bi = BlockSAD[list][refindex][3];
  _bj = _bi + 2;
  ADD_UP_BLOCKS();
}


/*!
 ***********************************************************************
 * \brief
 *    Setup the fast search for an macroblock
 ***********************************************************************
 */
void SetupFastFullPelSearch (int ref, int list)  // <--  reference frame parameter, list0 or 1
{
  int     pmv[2];
  pel_t   orig_blocks[256], *orgptr=orig_blocks, *refptr;
  int     offset_x, offset_y, x, y, range_partly_outside, ref_x, ref_y, pos, abs_x, abs_y, bindex, blky;
  int     LineSadBlk0, LineSadBlk1, LineSadBlk2, LineSadBlk3;
  int     max_width, max_height;
  int     img_width, img_height;

  StorablePicture *ref_picture;
  pel_t   *ref_pic;

  int**   block_sad     = BlockSAD[list][ref][7];
  int     search_range  = max_search_range[list][ref];
  int     max_pos       = (2*search_range+1) * (2*search_range+1);

  int     list_offset   = ((img->MbaffFrameFlag)&&(img->mb_data[img->current_mb_nr].mb_field))? img->current_mb_nr%2 ? 4 : 2 : 0;

  int     apply_weights = ( (active_pps->weighted_pred_flag && (img->type == P_SLICE || img->type == SP_SLICE)) ||
                            (active_pps->weighted_bipred_idc && (img->type == B_SLICE)));

  
  ref_picture     = listX[list+list_offset][ref];

  if (apply_weights)
    ref_pic       = ref_picture->imgY_11_w;
  else
    ref_pic       = ref_picture->imgY_11;

  max_width     = ref_picture->size_x - 17;
  max_height    = ref_picture->size_y - 17;
  
  img_width     = ref_picture->size_x;
  img_height    = ref_picture->size_y;

  //===== get search center: predictor of 16x16 block =====
  SetMotionVectorPredictor (pmv, enc_picture->ref_idx, enc_picture->mv, ref, list, 0, 0, 16, 16);
  search_center_x[list][ref] = pmv[0] / 4;
  search_center_y[list][ref] = pmv[1] / 4;

  if (!input->rdopt)
  {
    //--- correct center so that (0,0) vector is inside ---
    search_center_x[list][ref] = max(-search_range, min(search_range, search_center_x[list][ref]));
    search_center_y[list][ref] = max(-search_range, min(search_range, search_center_y[list][ref]));
  }

  search_center_x[list][ref] += img->opix_x;
  search_center_y[list][ref] += img->opix_y;