/*!
 ***********************************************************************
 *  \file
 *      mbuffer.c
 *
 *  \brief
 *      Frame buffer functions
 *
 *  \author
 *      Main contributors (see contributors.h for copyright, address and affiliation details)
 *      - Karsten S黨ring          <suehring@hhi.de>
 *      - Alexis Tourapis                 <alexismt@ieee.org>
 ***********************************************************************
 */

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

#include "global.h"
#include "mbuffer.h"
#include "memalloc.h"
#include "output.h"
#include "image.h"
#include "header.h"

static void insert_picture_in_dpb(FrameStore* fs, StorablePicture* p);
static void output_one_frame_from_dpb();
static int  is_used_for_reference(FrameStore* fs);
static void get_smallest_poc(int *poc,int * pos);
static int  remove_unused_frame_from_dpb();
static int  is_short_term_reference(FrameStore* fs);
static int  is_long_term_reference(FrameStore* fs);
void gen_field_ref_ids(StorablePicture *p);

DecodedPictureBuffer dpb;

StorablePicture **listX[6];

ColocatedParams *Co_located = NULL;

extern StorablePicture *dec_picture;

int listXsize[6];

#define MAX_LIST_SIZE 33

/*!
 ************************************************************************
 * \brief
 *    Print out list of pictures in DPB. Used for debug purposes.
 ************************************************************************
 */
void dump_dpb()
{
  unsigned i;

  return;
  
  for (i=0; i<dpb.used_size;i++)
  {
    printf("(");
    printf("fn=%d  ", dpb.fs[i]->frame_num);
    if (dpb.fs[i]->is_used & 1)
      printf("T: poc=%d  ", dpb.fs[i]->top_field->poc);
    if (dpb.fs[i]->is_used & 2)
      printf("B: poc=%d  ", dpb.fs[i]->bottom_field->poc);
    if (dpb.fs[i]->is_used == 3)
      printf("F: poc=%d  ", dpb.fs[i]->frame->poc);
    printf("G: poc=%d)  ", dpb.fs[i]->poc);
    if (dpb.fs[i]->is_reference) printf ("ref (%d) ", dpb.fs[i]->is_reference);
    if (dpb.fs[i]->is_long_term) printf ("lt_ref (%d) ", dpb.fs[i]->is_reference);
    if (dpb.fs[i]->is_output) printf ("out  ");
    if (dpb.fs[i]->is_used == 3)
    {
      if (dpb.fs[i]->frame->non_existing) printf ("ne  ");
    }
    printf ("\n");
  }
}

/*!
 ************************************************************************
 * \brief
 *    Returns the size of the dpb depending on level and picture size
 *
 *
 ************************************************************************
 */
int getDpbSize()
{
  int pic_size = (active_sps->pic_width_in_mbs_minus1 + 1) * (active_sps->pic_height_in_map_units_minus1 + 1) * (active_sps->frame_mbs_only_flag?1:2) * 384;

  int size = 0;

  switch (active_sps->level_idc)
  {
  case 10:
    size = 152064;
    break;
  case 11:
    size = 345600;
    break;
  case 12:
    size = 912384;
    break;
  case 13:
    size = 912384;
    break;
  case 20:
    size = 912384;
    break;
  case 21:
    size = 1824768;
    break;
  case 22:
    size = 3110400;
    break;
  case 30:
    size = 3110400;
    break;
  case 31:
    size = 6912000;
    break;
  case 32:
    size = 7864320;
    break;
  case 40:
    size = 12582912;
    break;
  case 41:
    size = 12582912;
    break;
  case 42:
    size = 12582912;
    break;
  case 50:
    size = 42393600;
    break;
  case 51:
    size = 70778880;
    break;
  default:
    error ("undefined level", 500);
    break;
  }

  size /= pic_size;
  return min( size, 16);
}

/*!
 ************************************************************************
 * \brief
 *    Allocate memory for decoded picture buffer and initialize with sane values.
 *
 ************************************************************************
 */
void init_dpb()
{
  unsigned i,j;

  if (dpb.init_done)
  {
    free_dpb();
  }

  dpb.size      = getDpbSize();
  dpb.num_ref_frames = active_sps->num_ref_frames;

  if (0==dpb.size)
  {
    printf("warning: DPB size of zero frames at specified level / frame size. Decoding may fail.\n");
  }
//  dpb.size      = input->dpb_size;
  dpb.used_size = 0;
  dpb.last_picture = NULL;

  dpb.ref_frames_in_buffer = 0;
  dpb.ltref_frames_in_buffer = 0;
  
  dpb.fs = calloc(dpb.size, sizeof (FrameStore*));
  if (NULL==dpb.fs) 
    no_mem_exit("init_dpb: dpb->fs");

  dpb.fs_ref = calloc(dpb.size, sizeof (FrameStore*));
  if (NULL==dpb.fs_ref) 
    no_mem_exit("init_dpb: dpb->fs_ref");

  dpb.fs_ltref = calloc(dpb.size, sizeof (FrameStore*));
  if (NULL==dpb.fs_ltref) 
    no_mem_exit("init_dpb: dpb->fs_ltref");

  for (i=0; i<dpb.size; i++)
  {
    dpb.fs[i]       = alloc_frame_store();
    dpb.fs_ref[i]   = NULL;
    dpb.fs_ltref[i] = NULL;
  }
  
  for (i=0; i<6; i++)
  {
    listX[i] = calloc(MAX_LIST_SIZE, sizeof (StorablePicture*)); // +1 for reordering
    if (NULL==listX[i]) 
      no_mem_exit("init_dpb: listX[i]");
  }

  for (j=0;j<6;j++)
  {
    for (i=0; i<MAX_LIST_SIZE; i++)
    {
      listX[j][i] = NULL;
    }
    listXsize[j]=0;
  }

  dpb.last_output_poc = INT_MIN;

  img->last_has_mmco_5 = 0;

  dpb.init_done = 1;
}


/*!
 ************************************************************************
 * \brief
 *    Free memory for decoded picture buffer.
 ************************************************************************
 */
void free_dpb()
{
  unsigned i;
  if (dpb.fs)
  {
    for (i=0; i<dpb.size; i++)
    {
      free_frame_store(dpb.fs[i]);
    }
    free (dpb.fs);
    dpb.fs=NULL;
  }
  if (dpb.fs_ref)
  {
    free (dpb.fs_ref);
  }
  if (dpb.fs_ltref)
  {
    free (dpb.fs_ltref);
  }
  dpb.last_output_poc = INT_MIN;

  for (i=0; i<6; i++)
    if (listX[i])
    {
      free (listX[i]);
      listX[i] = NULL;
    }

  dpb.init_done = 0;
}


/*!
 ************************************************************************
 * \brief
 *    Allocate memory for decoded picture buffer frame stores an initialize with sane values.
 *
 * \return
 *    the allocated FrameStore structure
 ************************************************************************
 */
FrameStore* alloc_frame_store()
{
  FrameStore *f;

  f = calloc (1, sizeof(FrameStore));
  if (NULL==f) 
    no_mem_exit("alloc_frame_store: f");

  f->is_used      = 0;
  f->is_reference = 0;
  f->is_long_term = 0;
  f->is_orig_reference = 0;

  f->is_output = 0;

  f->frame        = NULL;;
  f->top_field    = NULL;
  f->bottom_field = NULL;

  return f;
}

/*!
 ************************************************************************
 * \brief
 *    Allocate memory for a stored picture. 
 *
 * \param structure
 *    picture structure
 * \param size_x
 *    horizontal luma size
 * \param size_y
 *    vertical luma size
 * \param size_x_cr
 *    horizontal chroma size
 * \param size_y_cr
 *    vertical chroma size
 *
 * \return
 *    the allocated StorablePicture structure
 ************************************************************************
 */
StorablePicture* alloc_storable_picture(PictureStructure structure, int size_x, int size_y, int size_x_cr, int size_y_cr)
{
  StorablePicture *s;

  //printf ("Allocating (%s) picture (x=%d, y=%d, x_cr=%d, y_cr=%d)\n", (type == FRAME)?"FRAME":(type == TOP_FIELD)?"TOP_FIELD":"BOTTOM_FIELD", size_x, size_y, size_x_cr, size_y_cr);

  s = calloc (1, sizeof(StorablePicture));
  if (NULL==s) 
    no_mem_exit("alloc_storable_picture: s");

  if (structure!=FRAME)
  {
    size_y    /= 2;
    size_y_cr /= 2; 
  }

  s->PicSizeInMbs                  = (size_x*size_y)/256;

  get_mem2Dpel (&(s->imgY), size_y, size_x);
  get_mem3Dpel (&(s->imgUV), 2, size_y_cr, size_x_cr);

  s->mb_field = calloc (s->PicSizeInMbs, sizeof(int));

  get_mem2Dint (&(s->slice_id), size_x / MB_BLOCK_SIZE, size_y / MB_BLOCK_SIZE);

  get_mem3Dint (&(s->ref_idx), 2, size_x / BLOCK_SIZE, size_y / BLOCK_SIZE);
  get_mem3Dint64 (&(s->ref_pic_id), 6, size_x / BLOCK_SIZE, size_y / BLOCK_SIZE);
  get_mem3Dint64 (&(s->ref_id), 6, size_x / BLOCK_SIZE, size_y / BLOCK_SIZE);
  get_mem4Dint (&(s->mv), 2, size_x / BLOCK_SIZE, size_y / BLOCK_SIZE,2 );

  get_mem2D (&(s->moving_block), size_x / BLOCK_SIZE, size_y / BLOCK_SIZE);
  get_mem2D (&(s->field_frame), size_x / BLOCK_SIZE, size_y / BLOCK_SIZE);

  s->pic_num=0;
  s->frame_num=0;
  s->long_term_frame_idx=0;
  s->long_term_pic_num=0;
  s->used_for_reference=0;
  s->is_long_term=0;
  s->non_existing=0;
  s->is_output = 0;
  s->max_slice_id = 0;

  s->structure=structure;

  s->size_x = size_x;
  s->size_y = size_y;
  s->size_x_cr = size_x_cr;
  s->size_y_cr = size_y_cr;
  
  s->top_field    = NULL;
  s->bottom_field = NULL;
  s->frame        = NULL;

  s->dec_ref_pic_marking_buffer = NULL;

  s->coded_frame                   = 0;
  s->MbaffFrameFlag                = 0;

  return s;
}

/*!
 ************************************************************************
 * \brief
 *    Free frame store memory.
 *
 * \param f
 *    FrameStore to be freed
 *
 ************************************************************************
 */
void free_frame_store(FrameStore* f)
{
  if (f)
  {
    if (f->frame)
    {
      free_storable_picture(f->frame);
      f->frame=NULL;
    }
    if (f->top_field)
    {
      free_storable_picture(f->top_field);
      f->top_field=NULL;
    }
    if (f->bottom_field)
    {
      free_storable_picture(f->bottom_field);
      f->bottom_field=NULL;
    }
    free(f);
  }
}

/*!
 ************************************************************************
 * \brief
 *    Free picture memory.
 *
 * \param p
 *    Picture to be freed
 *
 ************************************************************************
 */
void free_storable_picture(StorablePicture* p)
{
  if (p)
  {
    free_mem2Dint   (p->slice_id);
    free_mem3Dint   (p->ref_idx, 2);
    free_mem3Dint64 (p->ref_pic_id, 6);
    free_mem3Dint64 (p->ref_id, 6);
    free_mem4Dint   (p->mv, 2, p->size_x / BLOCK_SIZE);

    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->imgUV)
    {
      free_mem3Dpel (p->imgUV, 2);
      p->imgUV=NULL;
    }
    
    free(p->mb_field);

    free(p);
  }
}