************************************************************************
*/
void free_storable_picture(StorablePicture* p)
{
  if (p)
  {
    if (p->ref_idx)
    {
      free_mem3D ((byte***)p->ref_idx, 2);
      p->ref_idx = NULL;
    }

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

#ifdef ADAPTIVE_FILTER
    if(p->imgY_ups_aif)
    {
      free_mem2Dpel(p->imgY_ups_aif);
    }
    p->p_imgY_ups_aif=NULL;
    //separable aif (BEGIN)
    if(p->imgY_ups_aif_hor)
    {
      free_mem2Ddouble(p->imgY_ups_aif_hor);
    }
    p->imgY_ups_aif_hor=NULL;
    //separable aif (END)

#ifdef E_DAIF
    if (p->imgY_11_aif)
    {
      free (p->imgY_11_aif);
      p->imgY_11_aif=NULL;
    }
#endif  // E_DAIF

#endif  // ADAPTIVE_FILTER     

#ifdef SWITCHED_FILTERS
    if(p->imgY_filt)
    {
      free_mem2Dpel (p->imgY_filt);
      p->imgY_filt = NULL;
    }
    if(p->imgY_11_filt)
    {
      free (p->imgY_11_filt);
      p->imgY_11_filt = NULL;
    }
    p->p_imgY_filt = NULL;  
    p->p_imgY_11_filt = NULL;  
#endif  // SWITCHED_FILTERS

    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;
    }
#ifdef ADAPTIVE_FILTER
    if (fs->frame->imgY_ups_aif)
    {
      free_mem2Dpel (fs->frame->imgY_ups_aif);
      fs->frame->imgY_ups_aif=NULL;
    }
    //separable aif (BEGIN)
    if (fs->frame->imgY_ups_aif_hor)
    {
      free_mem2Ddouble (fs->frame->imgY_ups_aif_hor); 
      fs->frame->imgY_ups_aif_hor=NULL;
    }
    //separable aif (END)
#ifdef E_DAIF
    if (fs->frame->imgY_11_aif)
    {
      free (fs->frame->imgY_11_aif);
      fs->frame->imgY_11_aif=NULL;
    }
#endif  // E_DAIF 
#endif  // ADAPTIVE_FILTER

    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;
    }
#ifdef ADAPTIVE_FILTER
    if (fs->top_field->imgY_ups_aif)
    {
      free_mem2Dpel (fs->top_field->imgY_ups_aif);
      fs->top_field->imgY_ups_aif=NULL;
    }
#ifdef E_DAIF
    if (fs->top_field->imgY_11_aif)
    {
      free (fs->top_field->imgY_11_aif);
      fs->top_field->imgY_11_aif=NULL;
    }
#endif  // E_DAIF 
#endif  // ADAPTIVE_FILTER

    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;