www.pudn.com > jm50g.zip > b_frame.c
/*
***********************************************************************
* COPYRIGHT AND WARRANTY INFORMATION
*
* Copyright 2001, International Telecommunications Union, Geneva
*
* DISCLAIMER OF WARRANTY
*
* These software programs are available to the user without any
* license fee or royalty on an "as is" basis. The ITU disclaims
* any and all warranties, whether express, implied, or
* statutory, including any implied warranties of merchantability
* or of fitness for a particular purpose. In no event shall the
* contributor or the ITU be liable for any incidental, punitive, or
* consequential damages of any kind whatsoever arising from the
* 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.
* Commercial implementations of ITU-T Recommendations, including
* shareware, may be subject to royalty fees to patent holders.
* Information regarding the ITU-T patent policy is available from
* the ITU Web site at http://www.itu.int.
*
* THIS IS NOT A GRANT OF PATENT RIGHTS - SEE THE ITU-T PATENT POLICY.
************************************************************************
*/
/*!
*************************************************************************************
* \file b_frame.c
*
* \brief
* B picture decoding
*
* \author
* Main contributors (see contributors.h for copyright, address and affiliation details)
* - Byeong-Moon Jeon
* - Yoon-Seong Soh
* - Thomas Wedi
*************************************************************************************
*/
#include
#include
#include
#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;iheight;i++)
for(j=0;jwidth;j++)
{
imgY_prev[i][j] = imgY_pf[i][j];
}
for(i=0;iheight_cr;i++)
for(j=0;jwidth_cr;j++)
{
imgUV_prev[0][i][j] = imgUV_pf[0][i][j];
}
for(i=0;iheight_cr;i++)
for(j=0;jwidth_cr;j++)
{
imgUV_prev[1][i][j] = imgUV_pf[1][i][j];
}
}
else
{
for(i=0;iheight;i++)
for(j=0;jwidth;j++)
{
imgY_prev[i][j] = imgY[i][j];
}
for(i=0;iheight_cr;i++)
for(j=0;jwidth_cr;j++)
{
imgUV_prev[0][i][j] = imgUV[0][i][j];
}
for(i=0;iheight_cr;i++)
for(j=0;jwidth_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;
int img_block_y;
int j2 = img->block_y;
Macroblock *currMB = &img->mb_data[img->map_mb_nr];//GB current_mb_nr];
if (img->mb_frame_field_flag)
j2 = img->block_y/2 - 2*(img->current_mb_nr%2);
// reset vectors and pred. modes
for (i=0;ifw_mv_frm[img->block_x+i+4][img->block_y+j][0]=img->fw_mv_frm[img->block_x+i+4][img->block_y+j][1]=0;
img->bw_mv_frm[img->block_x+i+4][img->block_y+j][0]=img->bw_mv_frm[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] = DC_PRED;
if (img->mb_frame_field_flag)
{
img->dfMV_top[img->block_x+i+4][img->block_y+j][0]=img->dfMV_top[img->block_x+i+4][img->block_y+j][1]=0;
img->dbMV_top[img->block_x+i+4][img->block_y+j][0]=img->dbMV_top[img->block_x+i+4][img->block_y+j][1]=0;
img->dfMV_bot[img->block_x+i+4][img->block_y+j][0]=img->dfMV_bot[img->block_x+i+4][img->block_y+j][1]=0;
img->dbMV_bot[img->block_x+i+4][img->block_y+j][0]=img->dbMV_bot[img->block_x+i+4][img->block_y+j][1]=0;
}
if (img->current_mb_nr%2==0 && img->mb_frame_field_flag)
{
img->ipredmode_top[img->block_x+i+1][j2+j+1] = DC_PRED;
img->fw_mv_top[img->block_x+i+4][j2+j][0]=img->fw_mv_top[img->block_x+i+4][j2+j][1]=0;
img->bw_mv_top[img->block_x+i+4][j2+j][0]=img->bw_mv_top[img->block_x+i+4][j2+j][1]=0;
}
else if (img->mb_frame_field_flag)
{
img->ipredmode_bot[img->block_x+i+1][j2+j+1] = DC_PRED;
img->fw_mv_bot[img->block_x+i+4][j2+j][0]=img->fw_mv_bot[img->block_x+i+4][j2+j][1]=0;
img->bw_mv_bot[img->block_x+i+4][j2+j][0]=img->bw_mv_bot[img->block_x+i+4][j2+j][1]=0;
}
else
{
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;
}
}
}
// Set the reference frame information for motion vector prediction
if (IS_INTRA (currMB) || IS_DIRECT (currMB))
{
if (img->structure != FRAME || img->mb_frame_field_flag == 0)
{
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
{
if (img->current_mb_nr%2==0)
{
img_block_y = img->block_y/2;
for (j=0; j<4; j++)
for (i=0; i<4; i++)
{
img->fw_refFrArr_top[img_block_y+j][img->block_x+i] = -1;
img->fw_refFrArr_frm[img->block_y+j][img->block_x+i] = -1;
img->bw_refFrArr_top[img_block_y+j][img->block_x+i] = -1;
img->bw_refFrArr_frm[img->block_y+j][img->block_x+i] = -1;
}
}
else
{
img_block_y = (img->block_y-4)/2;
for (j=0; j<4; j++)
for (i=0; i<4; i++)
{
img->fw_refFrArr_bot[img_block_y+j][img->block_x+i] = -1;
img->fw_refFrArr_frm[img->block_y+j][img->block_x+i] = -1;
img->bw_refFrArr_bot[img_block_y+j][img->block_x+i] = -1;
img->bw_refFrArr_frm[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);
if(img->structure != FRAME)
{
img->fw_refFrArr[img->block_y+j][img->block_x+i] = ((currMB->b8pdir[k]==0||currMB->b8pdir[k]==2)&&currMB->b8mode[k]!=0?2:-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);
}
else if (img->mb_frame_field_flag)
{
if (img->current_mb_nr%2==0)
{
img_block_y = img->block_y/2;
img->fw_refFrArr_top[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_top[img_block_y+j][img->block_x+i] = ((currMB->b8pdir[k]==1||currMB->b8pdir[k]==2)&&currMB->b8mode[k]!=0?0:-1);
img->fw_refFrArr_frm[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_frm[img->block_y+j][img->block_x+i] = ((currMB->b8pdir[k]==1||currMB->b8pdir[k]==2)&&currMB->b8mode[k]!=0?0:-1);
}
else
{
img_block_y = (img->block_y-4)/2;
img->fw_refFrArr_bot[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_bot[img_block_y+j][img->block_x+i] = ((currMB->b8pdir[k]==1||currMB->b8pdir[k]==2)&&currMB->b8mode[k]!=0?0:-1);
img->fw_refFrArr_frm[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_frm[img->block_y+j][img->block_x+i] = ((currMB->b8pdir[k]==1||currMB->b8pdir[k]==2)&&currMB->b8mode[k]!=0?0:-1);
}
}
else
{
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);
}
}
}
}