📄 loopfilter.c
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/*!
*************************************************************************************
* \file loopFilter.c
*
* \brief
* Filter to reduce blocking artifacts on a macroblock level.
* The filter strengh is QP dependent.
*
* \author
* Contributors:
* - Peter List Peter.List@t-systems.de: Original code (13-Aug-2001)
* - Jani Lainema Jani.Lainema@nokia.com: Some bug fixing, removal of recusiveness (16-Aug-2001)
* - Peter List Peter.List@t-systems.de: inplace filtering and various simplifications (10-Jan-2002)
* - Anthony Joch anthony@ubvideo.com: Simplified switching between filters and
* non-recursive default filter. (08-Jul-2002)
* - Cristina Gomila cristina.gomila@thomson.net: Simplification of the chroma deblocking
* from JVT-E089 (21-Nov-2002)
*************************************************************************************
*/
#include <stdlib.h>
#include <string.h>
#include "global.h"
#include "image.h"
#include "mb_access.h"
extern const byte QP_SCALE_CR[52] ;
byte mixedModeEdgeFlag, fieldModeFilteringFlag;
/*********************************************************************************************************/
#define IClip( Min, Max, Val) (((Val)<(Min))? (Min):(((Val)>(Max))? (Max):(Val)))
// NOTE: to change the tables below for instance when the QP doubling is changed from 6 to 8 values
// send an e-mail to Peter.List@t-systems.com to get a little programm that calculates them automatically
byte ALPHA_TABLE[52] = {0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,4,4,5,6, 7,8,9,10,12,13,15,17, 20,22,25,28,32,36,40,45, 50,56,63,71,80,90,101,113, 127,144,162,182,203,226,255,255} ;
byte BETA_TABLE[52] = {0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,2,2,2,3, 3,3,3, 4, 4, 4, 6, 6, 7, 7, 8, 8, 9, 9,10,10, 11,11,12,12,13,13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18} ;
byte CLIP_TAB[52][5] =
{
{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},
{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},{ 0, 0, 0, 0, 0},
{ 0, 0, 0, 0, 0},{ 0, 0, 0, 1, 1},{ 0, 0, 0, 1, 1},{ 0, 0, 0, 1, 1},{ 0, 0, 0, 1, 1},{ 0, 0, 1, 1, 1},{ 0, 0, 1, 1, 1},{ 0, 1, 1, 1, 1},
{ 0, 1, 1, 1, 1},{ 0, 1, 1, 1, 1},{ 0, 1, 1, 1, 1},{ 0, 1, 1, 2, 2},{ 0, 1, 1, 2, 2},{ 0, 1, 1, 2, 2},{ 0, 1, 1, 2, 2},{ 0, 1, 2, 3, 3},
{ 0, 1, 2, 3, 3},{ 0, 2, 2, 3, 3},{ 0, 2, 2, 4, 4},{ 0, 2, 3, 4, 4},{ 0, 2, 3, 4, 4},{ 0, 3, 3, 5, 5},{ 0, 3, 4, 6, 6},{ 0, 3, 4, 6, 6},
{ 0, 4, 5, 7, 7},{ 0, 4, 5, 8, 8},{ 0, 4, 6, 9, 9},{ 0, 5, 7,10,10},{ 0, 6, 8,11,11},{ 0, 6, 8,13,13},{ 0, 7,10,14,14},{ 0, 8,11,16,16},
{ 0, 9,12,18,18},{ 0,10,13,20,20},{ 0,11,15,23,23},{ 0,13,17,25,25}
} ;
void GetStrength(byte Strength[16],ImageParameters *img,int MbQAddr,int dir,int edge, int mvlimit);
void EdgeLoop(byte** Img, byte Strength[16],ImageParameters *img, int MbQAddr, int AlphaC0Offset, int BetaOffset, int dir, int edge, int width, int yuv);
void DeblockMb(ImageParameters *img, byte **imgY, byte ***imgUV, int MbQAddr) ;
/*!
*****************************************************************************************
* \brief
* Filter all macroblocks in order of increasing macroblock address.
*****************************************************************************************
*/
void DeblockFrame(ImageParameters *img, byte **imgY, byte ***imgUV)
{
unsigned i;
for (i=0; i<img->PicSizeInMbs; i++)
{
DeblockMb( img, imgY, imgUV, i ) ;
}
}
/*!
*****************************************************************************************
* \brief
* Deblocking filter for one macroblock.
*****************************************************************************************
*/
void DeblockMb(ImageParameters *img, byte **imgY, byte ***imgUV, int MbQAddr)
{
int EdgeCondition;
int dir,edge;
byte Strength[16];
int mb_x, mb_y;
int filterLeftMbEdgeFlag;
int filterTopMbEdgeFlag;
int fieldModeMbFlag;
int mvlimit=4;
int i, StrengthSum;
Macroblock *MbQ;
img->DeblockCall = 1;
get_mb_pos (MbQAddr, &mb_x, &mb_y);
filterLeftMbEdgeFlag = (mb_x != 0);
filterTopMbEdgeFlag = (mb_y != 0);
MbQ = &(img->mb_data[MbQAddr]) ; // current Mb
if (img->MbaffFrameFlag && mb_y==16 && MbQ->mb_field)
filterTopMbEdgeFlag = 0;
fieldModeMbFlag = (img->structure!=FRAME) || (img->MbaffFrameFlag && MbQ->mb_field);
if (fieldModeMbFlag)
mvlimit = 2;
// return, if filter is disabled
if (MbQ->LFDisableIdc==1) {
img->DeblockCall = 0;
return;
}
if (MbQ->LFDisableIdc==2)
{
// don't filter at slice boundaries
filterLeftMbEdgeFlag = MbQ->mbAvailA;
filterTopMbEdgeFlag = MbQ->mbAvailB;;
}
img->current_mb_nr = MbQAddr;
CheckAvailabilityOfNeighbors();
for( dir=0 ; dir<2 ; dir++ ) // vertical edges, than horicontal edges
{
EdgeCondition = (dir && filterTopMbEdgeFlag) || (!dir && filterLeftMbEdgeFlag); // can not filter beyond picture boundaries
for( edge=0 ; edge<4 ; edge++ ) // first 4 vertical strips of 16 pel
{ // then 4 horicontal
if( edge || EdgeCondition )
{
GetStrength(Strength,img,MbQAddr,dir,edge, mvlimit); // Strength for 4 blks in 1 stripe
StrengthSum = Strength[0];
for (i = 1; i < 16; i++) StrengthSum += Strength[i];
if( StrengthSum ) // only if one of the 16 Strength bytes is != 0
{
EdgeLoop( imgY, Strength, img, MbQAddr, MbQ->LFAlphaC0Offset, MbQ->LFBetaOffset, dir, edge, img->width, 0) ;
if( (imgUV != NULL) && !(edge & 1) )
{
EdgeLoop( imgUV[0], Strength, img, MbQAddr, MbQ->LFAlphaC0Offset, MbQ->LFBetaOffset, dir, edge/2, img->width_cr, 1 ) ;
EdgeLoop( imgUV[1], Strength, img, MbQAddr, MbQ->LFAlphaC0Offset, MbQ->LFBetaOffset, dir, edge/2, img->width_cr, 1 ) ;
}
}
if (dir && !edge && !MbQ->mb_field && mixedModeEdgeFlag) {
// this is the extra horizontal edge between a frame macroblock pair and a field above it
img->DeblockCall = 2;
GetStrength(Strength,img,MbQAddr,dir,4, mvlimit); // Strength for 4 blks in 1 stripe
if( *((int*)Strength) ) // only if one of the 4 Strength bytes is != 0
{
EdgeLoop( imgY, Strength, img, MbQAddr, MbQ->LFAlphaC0Offset, MbQ->LFBetaOffset, dir, 4, img->width, 0) ;
if( (imgUV != NULL) && !(edge & 1) )
{
EdgeLoop( imgUV[0], Strength, img, MbQAddr, MbQ->LFAlphaC0Offset, MbQ->LFBetaOffset, dir, 4, img->width_cr, 1 ) ;
EdgeLoop( imgUV[1], Strength, img, MbQAddr, MbQ->LFAlphaC0Offset, MbQ->LFBetaOffset, dir, 4, img->width_cr, 1 ) ;
}
}
img->DeblockCall = 1;
}
}
}//end edge
}//end loop dir
img->DeblockCall = 0;
}
/*!
*********************************************************************************************
* \brief
* returns a buffer of 16 Strength values for one stripe in a mb (for different Frame types)
*********************************************************************************************
*/
int ININT_STRENGTH[4] = {0x04040404, 0x03030303, 0x03030303, 0x03030303} ;
byte BLK_NUM[2][4][4] = {{{0,4,8,12},{1,5,9,13},{2,6,10,14},{3,7,11,15}},{{0,1,2,3},{4,5,6,7},{8,9,10,11},{12,13,14,15}}} ;
byte BLK_4_TO_8[16] = {0,0,1,1,0,0,1,1,2,2,3,3,2,2,3,3} ;
#define ANY_INTRA (MbP->mb_type==I4MB||MbP->mb_type==I16MB||MbP->mb_type==IPCM||MbQ->mb_type==I4MB||MbQ->mb_type==I16MB||MbQ->mb_type==IPCM)
void GetStrength(byte Strength[16],ImageParameters *img,int MbQAddr,int dir,int edge, int mvlimit)
{
int blkP, blkQ, idx;
int blk_x, blk_x2, blk_y, blk_y2 ;
int ***list0_mv = enc_picture->mv[LIST_0];
int ***list1_mv = enc_picture->mv[LIST_1];
int **list0_refIdxArr = enc_picture->ref_idx[LIST_0];
int **list1_refIdxArr = enc_picture->ref_idx[LIST_1];
int64 **list0_refPicIdArr = enc_picture->ref_pic_id[LIST_0];
int64 **list1_refPicIdArr = enc_picture->ref_pic_id[LIST_1];
int xQ, xP, yQ, yP;
int mb_x, mb_y;
Macroblock *MbQ;
Macroblock *MbP;
PixelPos pixP;
MbQ = &(img->mb_data[MbQAddr]);
for( idx=0 ; idx<16 ; idx++ )
{
xQ = dir ? idx : edge << 2;
yQ = dir ? (edge < 4 ? edge << 2 : 1) : idx;
getNeighbour(MbQAddr, xQ - (1 - dir), yQ - dir, 1, &pixP);
xP = pixP.x;
yP = pixP.y;
MbP = &(img->mb_data[pixP.mb_addr]);
mixedModeEdgeFlag = MbQ->mb_field != MbP->mb_field;
blkQ = ((yQ>>2)<<2) + (xQ>>2);
blkP = ((yP>>2)<<2) + (xP>>2);
if ((img->type==SP_SLICE)||(img->type==SI_SLICE) )
{
Strength[idx] = (edge == 0 && (((!img->MbaffFrameFlag && (img->structure==FRAME)) ||
(img->MbaffFrameFlag && !MbP->mb_field && !MbQ->mb_field)) ||
((img->MbaffFrameFlag || (img->structure!=FRAME)) && !dir))) ? 4 : 3;
}
else
{
// Start with Strength=3. or Strength=4 for Mb-edge
Strength[idx] = (edge == 0 && (((!img->MbaffFrameFlag && (img->structure==FRAME)) ||
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