b_frame.c

h.264/avc 视频编码程序,实现分数像素匹配功能,非原创.

/*
***********************************************************************
* COPYRIGHT AND WARRANTY INFORMATION
*
* Copyright 2001, International Telecommunications Union, Geneva
*
* DISCLAIMER OF WARRANTY
*
* These software programs are available to the user without any
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* use of these programs.
*
* This disclaimer of warranty extends to the user of these programs
* and user's customers, employees, agents, transferees, successors,
* and assigns.
*
* The ITU does not represent or warrant that the programs furnished
* hereunder are free of infringement of any third-party patents.
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/*!
 *************************************************************************************
 * \file b_frame.c
 *
 * \brief
 *    B picture decoding
 *
 * \author
 *    Main contributors (see contributors.h for copyright, address and affiliation details)
 *    - Byeong-Moon Jeon                <[e-mail]>
 *    - Yoon-Seong Soh                  <[e-mail]>
 *    - Thomas Wedi                     <[e-mail]>
 *************************************************************************************
 */

#include <stdlib.h>
#include <math.h>
#include <string.h>

#include "global.h"
#include "mbuffer.h"
#include "b_frame.h"

#define POS 0



/*!
 ************************************************************************
 * \brief
 *    Copy decoded P frame to temporary image array
 ************************************************************************
 */
void copy_Pframe(struct img_par *img, int postfilter)
{
  int i,j;

  /*
   * the mmin, mmax macros are taken out, because it makes no sense due to limited range of data type
   */

  if(postfilter)
  {
    for(i=0;i<img->height;i++)
      for(j=0;j<img->width;j++)
      {
        imgY_prev[i][j] = imgY_pf[i][j];
      }
    for(i=0;i<img->height_cr;i++)
      for(j=0;j<img->width_cr;j++)
      {
        imgUV_prev[0][i][j] = imgUV_pf[0][i][j];
      }
    for(i=0;i<img->height_cr;i++)
      for(j=0;j<img->width_cr;j++)
      {
        imgUV_prev[1][i][j] = imgUV_pf[1][i][j];
      }
  }
  else
  {
    for(i=0;i<img->height;i++)
      for(j=0;j<img->width;j++)
      {
        imgY_prev[i][j] = imgY[i][j];
      }
    for(i=0;i<img->height_cr;i++)
      for(j=0;j<img->width_cr;j++)
      {
        imgUV_prev[0][i][j] = imgUV[0][i][j];
      }
    for(i=0;i<img->height_cr;i++)
      for(j=0;j<img->width_cr;j++)
      {
        imgUV_prev[1][i][j] = imgUV[1][i][j];
      }
  }
}




/*!
 ************************************************************************
 * \brief
 *    init macroblock B frames
 ************************************************************************
 */
void init_macroblock_Bframe(struct img_par *img)
{
  int i,j,k;
  Macroblock *currMB = &img->mb_data[img->current_mb_nr];

  // reset vectors and pred. modes
  for (i=0;i<BLOCK_SIZE;i++)
  {
    for(j=0;j<BLOCK_SIZE;j++)
    {
      img->fw_mv[img->block_x+i+4][img->block_y+j][0]=img->fw_mv[img->block_x+i+4][img->block_y+j][1]=0;
      img->bw_mv[img->block_x+i+4][img->block_y+j][0]=img->bw_mv[img->block_x+i+4][img->block_y+j][1]=0;
      img->dfMV [img->block_x+i+4][img->block_y+j][0]=img->dfMV[img->block_x+i+4][img->block_y+j][1]=0;
      img->dbMV [img->block_x+i+4][img->block_y+j][0]=img->dbMV[img->block_x+i+4][img->block_y+j][1]=0;
      img->ipredmode[img->block_x+i+1][img->block_y+j+1] = 0;
    }
  }

  // Set the reference frame information for motion vector prediction
  if (IS_INTRA (currMB) || IS_DIRECT (currMB))
  {
    for(j=0;j<4;j++)
    for(i=0;i<4;i++)
    {
      img->fw_refFrArr[img->block_y+j][img->block_x+i] = -1;
      img->bw_refFrArr[img->block_y+j][img->block_x+i] = -1;
    }
  }
  else
  {
    for(j=0;j<4;j++)
    for(i=0;i<4;i++)
    {
      k=2*(j/2)+(i/2);
      img->fw_refFrArr[img->block_y+j][img->block_x+i] = ((currMB->b8pdir[k]==0||currMB->b8pdir[k]==2)&&currMB->b8mode[k]!=0?0:-1);
      img->bw_refFrArr[img->block_y+j][img->block_x+i] = ((currMB->b8pdir[k]==1||currMB->b8pdir[k]==2)&&currMB->b8mode[k]!=0?0:-1);
    }
  }
}