{
      free_mem3Dint64 (p->ref_id, 6);
      p->ref_id = NULL;
    }
    if (p->mv)
    {
      free_mem4Dshort (p->mv, 2, p->size_y / BLOCK_SIZE);
      p->mv = NULL;
    }

    if (p->moving_block)
    {
      free_mem2D (p->moving_block);
      p->moving_block=NULL;
    }
    
    if (p->field_frame)
    {
      free_mem2D (p->field_frame);
      p->field_frame=NULL;
    }

    
    if (p->imgY)
    {
      free_mem2Dpel (p->imgY);
      p->imgY=NULL;
    }
    if (p->imgY_11)
    {
      free (p->imgY_11);
      p->imgY_11=NULL;
    }
    if (p->imgY_ups)
    {
      free_mem2Dpel (p->imgY_ups);
      p->imgY_ups=NULL;
    }
    if (p->imgUV)
    {
      free_mem3Dpel (p->imgUV, 2);
      p->imgUV=NULL;
    }

    if (input->WeightedPrediction || input->WeightedBiprediction || input->GenerateMultiplePPS)
    {
      if (p->imgY_11_w)
      {
        free (p->imgY_11_w);
        p->imgY_11_w=NULL;
      }
      if (p->imgY_ups_w)
      {
        free_mem2Dpel (p->imgY_ups_w);
        p->imgY_ups_w=NULL;
      }
    }

    if (p->mb_field)
    {
      free(p->mb_field);
      p->mb_field=NULL;
    }
    
    free(p);
    p = NULL;
  }
}

/*!
 ************************************************************************
 * \brief
 *    mark FrameStore unused for reference
 *
 ************************************************************************
 */
static void unmark_for_reference(FrameStore* fs)
{

  if (fs->is_used & 1)
  {
    if (fs->top_field)
    {
      fs->top_field->used_for_reference = 0;
    }
  }
  if (fs->is_used & 2)
  {
    if (fs->bottom_field)
    {
      fs->bottom_field->used_for_reference = 0;
    }
  }
  if (fs->is_used == 3)
  {
    if (fs->top_field && fs->bottom_field)
    {
      fs->top_field->used_for_reference = 0;
      fs->bottom_field->used_for_reference = 0;
    }
    fs->frame->used_for_reference = 0;
  }

  fs->is_reference = 0;

  if(fs->frame)
  {
    if (fs->frame->imgY_ups_w)
    {
      free_mem2Dpel (fs->frame->imgY_ups_w);
      fs->frame->imgY_ups_w=NULL;
    }
    if (fs->frame->imgY_ups)
    {
      free_mem2Dpel (fs->frame->imgY_ups);
      fs->frame->imgY_ups=NULL;
    }
    if (fs->frame->imgY_11_w)
    {
      free (fs->frame->imgY_11_w);
      fs->frame->imgY_11_w=NULL;
    }

    if (fs->frame->ref_pic_id)
    {
      free_mem3Dint64 (fs->frame->ref_pic_id, 6);
      fs->frame->ref_pic_id = NULL;
    }
    if (fs->frame->ref_id)
    {
      free_mem3Dint64 (fs->frame->ref_id, 6);
      fs->frame->ref_id = NULL;
    }
  }

  if (fs->top_field)
  {
    if (fs->top_field->imgY_ups_w)
    {
      free_mem2Dpel (fs->top_field->imgY_ups_w);
      fs->top_field->imgY_ups_w=NULL;
    }
    if (fs->top_field->imgY_ups)
    {
      free_mem2Dpel (fs->top_field->imgY_ups);
      fs->top_field->imgY_ups=NULL;
    }
    if (fs->top_field->imgY_11_w)
    {
      free (fs->top_field->imgY_11_w);
      fs->top_field->imgY_11_w=NULL;
    }
    
    if (fs->top_field->ref_pic_id)
    {
      free_mem3Dint64 (fs->top_field->ref_pic_id, 6);
      fs->top_field->ref_pic_id = NULL;
    }
    if (fs->top_field->ref_id)
    {
      free_mem3Dint64 (fs->top_field->ref_id, 6);
      fs->top_field->ref_id = NULL;
    }

  }
  if (fs->bottom_field)
  {
    if (fs->bottom_field->imgY_ups_w)
    {
      free_mem2Dpel (fs->bottom_field->imgY_ups_w);
      fs->bottom_field->imgY_ups_w=NULL;
    }
    if (fs->bottom_field->imgY_ups)
    {
      free_mem2Dpel (fs->bottom_field->imgY_ups);
      fs->bottom_field->imgY_ups=NULL;
    }
    if (fs->bottom_field->imgY_11_w)
    {
      free (fs->bottom_field->imgY_11_w);
      fs->bottom_field->imgY_11_w=NULL;
    }
    if (fs->bottom_field->ref_pic_id)
    {
      free_mem3Dint64 (fs->bottom_field->ref_pic_id, 6);
      fs->bottom_field->ref_pic_id = NULL;
    }
    if (fs->bottom_field->ref_id)
    {
      free_mem3Dint64 (fs->bottom_field->ref_id, 6);
      fs->bottom_field->ref_id = NULL;
    }
  }

}


/*!
 ************************************************************************
 * \brief
 *    mark FrameStore unused for reference and reset long term flags
 *
 ************************************************************************
 */
static void unmark_for_long_term_reference(FrameStore* fs)
{

  if (fs->is_used & 1)
  {
    if (fs->top_field)
    {
      fs->top_field->used_for_reference = 0;
      fs->top_field->is_long_term = 0;
    }
  }
  if (fs->is_used & 2)
  {
    if (fs->bottom_field)
    {
      fs->bottom_field->used_for_reference = 0;
      fs->bottom_field->is_long_term = 0;
    }
  }
  if (fs->is_used == 3)
  {
    if (fs->top_field && fs->bottom_field)
    {
      fs->top_field->used_for_reference = 0;
      fs->top_field->is_long_term = 0;
      fs->bottom_field->used_for_reference = 0;
      fs->bottom_field->is_long_term = 0;
    }
    fs->frame->used_for_reference = 0;
    fs->frame->is_long_term = 0;
  }

  fs->is_reference = 0;
  fs->is_long_term = 0;
}


/*!
 ************************************************************************
 * \brief
 *    compares two stored pictures by picture number for qsort in descending order
 *
 ************************************************************************
 */
static int compare_pic_by_pic_num_desc( const void *arg1, const void *arg2 )
{
  if ( (*(StorablePicture**)arg1)->pic_num < (*(StorablePicture**)arg2)->pic_num)
    return 1;
  if ( (*(StorablePicture**)arg1)->pic_num > (*(StorablePicture**)arg2)->pic_num)
    return -1;
  else
    return 0;
}

/*!
 ************************************************************************
 * \brief
 *    compares two stored pictures by picture number for qsort in descending order
 *
 ************************************************************************
 */
static int compare_pic_by_lt_pic_num_asc( const void *arg1, const void *arg2 )
{
  if ( (*(StorablePicture**)arg1)->long_term_pic_num < (*(StorablePicture**)arg2)->long_term_pic_num)
    return -1;
  if ( (*(StorablePicture**)arg1)->long_term_pic_num > (*(StorablePicture**)arg2)->long_term_pic_num)
    return 1;
  else
    return 0;
}

/*!
 ************************************************************************
 * \brief
 *    compares two frame stores by pic_num for qsort in descending order
 *
 ************************************************************************
 */
static int compare_fs_by_frame_num_desc( const void *arg1, const void *arg2 )
{
  if ( (*(FrameStore**)arg1)->frame_num_wrap < (*(FrameStore**)arg2)->frame_num_wrap)
    return 1;
  if ( (*(FrameStore**)arg1)->frame_num_wrap > (*(FrameStore**)arg2)->frame_num_wrap)
    return -1;
  else
    return 0;
}


/*!
 ************************************************************************
 * \brief
 *    compares two frame stores by lt_pic_num for qsort in descending order
 *
 ************************************************************************
 */
static int compare_fs_by_lt_pic_idx_asc( const void *arg1, const void *arg2 )
{
  if ( (*(FrameStore**)arg1)->long_term_frame_idx < (*(FrameStore**)arg2)->long_term_frame_idx)
    return -1;
  if ( (*(FrameStore**)arg1)->long_term_frame_idx > (*(FrameStore**)arg2)->long_term_frame_idx)
    return 1;
  else
    return 0;
}


/*!
 ************************************************************************
 * \brief
 *    compares two stored pictures by poc for qsort in ascending order
 *
 ************************************************************************
 */
static int compare_pic_by_poc_asc( const void *arg1, const void *arg2 )
{
  if ( (*(StorablePicture**)arg1)->poc < (*(StorablePicture**)arg2)->poc)
    return -1;
  if ( (*(StorablePicture**)arg1)->poc > (*(StorablePicture**)arg2)->poc)
    return 1;
  else
    return 0;
}


/*!
 ************************************************************************
 * \brief
 *    compares two stored pictures by poc for qsort in descending order
 *
 ************************************************************************
 */
static int compare_pic_by_poc_desc( const void *arg1, const void *arg2 )
{
  if ( (*(StorablePicture**)arg1)->poc < (*(StorablePicture**)arg2)->poc)
    return 1;
  if ( (*(StorablePicture**)arg1)->poc > (*(StorablePicture**)arg2)->poc)
    return -1;
  else
    return 0;
}


/*!
 ************************************************************************
 * \brief
 *    compares two frame stores by poc for qsort in ascending order
 *
 ************************************************************************
 */
static int compare_fs_by_poc_asc( const void *arg1, const void *arg2 )
{
  if ( (*(FrameStore**)arg1)->poc < (*(FrameStore**)arg2)->poc)
    return -1;
  if ( (*(FrameStore**)arg1)->poc > (*(FrameStore**)arg2)->poc)
    return 1;
  else
    return 0;
}


/*!
 ************************************************************************
 * \brief
 *    compares two frame stores by poc for qsort in descending order
 *
 ************************************************************************
 */
static int compare_fs_by_poc_desc( const void *arg1, const void *arg2 )
{
  if ( (*(FrameStore**)arg1)->poc < (*(FrameStore**)arg2)->poc)
    return 1;
  if ( (*(FrameStore**)arg1)->poc > (*(FrameStore**)arg2)->poc)
    return -1;
  else
    return 0;
}


/*!
 ************************************************************************
 * \brief
 *    returns true, if picture is short term reference picture
 *
 ************************************************************************
 */
int is_short_ref(StorablePicture *s)
{
  return ((s->used_for_reference) && (!(s->is_long_term)));
}


/*!
 ************************************************************************
 * \brief
 *    returns true, if picture is long term reference picture
 *
 ************************************************************************
 */
int is_long_ref(StorablePicture *s)
{
  return ((s->used_for_reference) && (s->is_long_term));
}


/*!
 ************************************************************************
 * \brief
 *    Generates a alternating field list from a given FrameStore list
 *
 ************************************************************************
 */
static void gen_pic_list_from_frame_list(PictureStructure currStrcture, FrameStore **fs_list, int list_idx, StorablePicture **list, int *list_size, int long_term)
{
  int top_idx = 0;
  int bot_idx = 0;

  int (*is_ref)(StorablePicture *s);

  if (long_term)
    is_ref=is_long_ref;
  else
    is_ref=is_short_ref;

  if (currStrcture == TOP_FIELD)
  {
    while ((top_idx<list_idx)||(bot_idx<list_idx))
    {
      for ( ; top_idx<list_idx; top_idx++)
      {
        if(fs_list[top_idx]->is_used & 1)
        {
          if(is_ref(fs_list[top_idx]->top_field))
          {
            // short term ref pic
            list[*list_size] = fs_list[top_idx]->top_field;
            (*list_size)++;
            top_idx++;
            break;
          }
        }
      }
      for ( ; bot_idx<list_idx; bot_idx++)
      {
        if(fs_list[bot_idx]->is_used & 2)
        {
          if(is_ref(fs_list[bot_idx]->bottom_field))
          {
            // short term ref pic
            list[*list_size] = fs_list[bot_idx]->bottom_field;
            (*list_size)++;
            bot_idx++;
            break;
          }
        }
      }
    }
  }
  if (currStrcture == BOTTOM_FIELD)
  {
    while ((top_idx<list_idx)||(bot_idx<list_idx))