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/************************************************************************
*
* filter.c, filter routines of tmn (TMN encoder)
*
* Copyright (C) 1997 University of BC, Canada
*
* Contacts:
* Michael Gallant <mikeg@ee.ubc.ca>
* Guy Cote <guyc@ee.ubc.ca>
* Berna Erol <bernae@ee.ubc.ca>
*
* UBC Image Processing Laboratory http://www.ee.ubc.ca/image
* 2356 Main Mall tel.: +1 604 822 4051
* Vancouver BC Canada V6T1Z4 fax.: +1 604 822 5949
*
************************************************************************/
/* Disclaimer of Warranty
*
* These software programs are available to the user without any license fee
* or royalty on an "as is" basis. The University of British Columbia
* disclaims any and all warranties, whether express, implied, or
* statuary, including any implied warranties or merchantability or of
* fitness for a particular purpose. In no event shall the
* copyright-holder 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 University of British Columbia does not represent or warrant that the
* programs furnished hereunder are free of infringement of any
* third-party patents.
*
* Commercial implementations of H.263, including shareware, are subject to
* royalty fees to patent holders. Many of these patents are general
* enough such that they are unavoidable regardless of implementation
* design.
*
*/
#include"sim.h"
static int STRENGTH[] = {1,1,2,2,3,3,4,4,4,5,5,6,6,7,7,7,8,8,8,9,9,9,10,10,10,11,11,11,12,12,12};
static int MQ_chroma_QP_table[32] = {0,1,2,3,4,5,6,6,7,8,9,9,10,10,11,11,12,12,12,13,13,13,14,14,14,14,14,15,15,15,15,15};
/**********************************************************************
*
* Name: EdgeFilter
* Description: performs in the loop edge-filtering on
* reconstructed frames (Deblocking Filter)
*
* Input: pointers to reconstructed frame and difference
* image
* Returns:
* Side effects:
*
* Date: 970820 Author: guyc@ee.ubc.ca
* modified to implement annex J of H.263+
*
***********************************************************************/
void EdgeFilter (PictImage * recon, Pict * pic)
{
/* Luma */
HorizEdgeFilter (recon->lum, pels, lines, pic, 0);
VertEdgeFilter (recon->lum, pels, lines, pic, 0);
/* Chroma */
HorizEdgeFilter (recon->Cb, pels / 2, lines / 2, pic, 1);
VertEdgeFilter (recon->Cb, pels / 2, lines / 2, pic, 1);
HorizEdgeFilter (recon->Cr, pels / 2, lines / 2, pic, 1);
VertEdgeFilter (recon->Cr, pels / 2, lines / 2, pic, 1);
/* that's it */
return;
}
/***********************************************************************/
void HorizEdgeFilter (unsigned char *rec, int width, int height, Pict * pic, int chr)
{
int i, j;
int delta, d1, d2;
int mbc, mbr, do_filter;
int QP;
int bquant[] = {5, 6, 7, 8};
int mbr_above;
/* horizontal edges */
for (j = 8; j < height; j += 8)
{
for (i = 0; i < width; i++)
{
if (!chr)
{
mbr = j >> 4;
mbc = i >> 4;
mbr_above = (j - 8) >> 4;
} else
{
mbr = j >> 3;
mbc = i >> 3;
mbr_above = mbr - 1;
}
do_filter = coded_map[mbr + 1][mbc + 1] || coded_map[mbr_above + 1][mbc + 1];
if (do_filter)
{
if (pic->PB)
{
QP = coded_map[mbr + 1][mbc + 1] ?
mmin (31, bquant[pic->BQUANT] * quant_map[mbr + 1][mbc + 1] / 4) :
mmin (31, bquant[pic->BQUANT] * quant_map[mbr_above + 1][mbc + 1] / 4);
} else
QP = coded_map[mbr + 1][mbc + 1] ? quant_map[mbr + 1][mbc + 1] : quant_map[mbr_above + 1][mbc + 1];
if (modified_quantization && chr)
{
QP=MQ_chroma_QP_table[QP];
}
delta = (int) (((int) (*(rec + i + (j - 2) * width)) +
(int) (*(rec + i + (j - 1) * width) * (-4)) +
(int) (*(rec + i + (j) * width) * (4)) +
(int) (*(rec + i + (j + 1) * width) * (-1))) / 8.0);
d1 = sign (delta) * mmax (0, abs (delta) - mmax (0, 2 * (abs (delta) - STRENGTH[QP - 1])));
d2 = mmin (abs (d1 / 2), mmax (-abs (d1 / 2), (int) (((*(rec + i + (j - 2) * width) -
*(rec + i + (j + 1) * width))) / 4)));
*(rec + i + (j + 1) * width) = (int) (*(rec + i + (j + 1) * width)) + d2;
*(rec + i + (j) * width) =
mmin (255, mmax (0, (int) (*(rec + i + (j) * width)) - d1));
*(rec + i + (j - 1) * width) =
mmin (255, mmax (0, (int) (*(rec + i + (j - 1) * width)) + d1));
*(rec + i + (j - 2) * width) = (int) (*(rec + i + (j - 2) * width)) - d2;
}
}
}
return;
}
void VertEdgeFilter (unsigned char *rec, int width, int height, Pict * pic, int chr)
{
int i, j;
int delta, d1, d2;
int mbc, mbr;
int do_filter;
int bquant[] = {5, 6, 7, 8};
int QP;
int mbc_left;
/* vertical edges */
for (i = 8; i < width; i += 8)
{
for (j = 0; j < height; j++)
{
if (!chr)
{
mbr = j >> 4;
mbc = i >> 4;
mbc_left = (i - 8) >> 4;
} else
{
mbr = j >> 3;
mbc = i >> 3;
mbc_left = mbc - 1;
}
do_filter = coded_map[mbr + 1][mbc + 1] || coded_map[mbr + 1][mbc_left + 1];
if (do_filter)
{
if (pic->PB)
{
QP = coded_map[mbr + 1][mbc + 1] ?
mmin (31, bquant[pic->BQUANT] * quant_map[mbr + 1][mbc + 1] / 4) :
mmin (31, bquant[pic->BQUANT] * quant_map[mbr + 1][mbc_left + 1] / 4);
} else
QP = coded_map[mbr + 1][mbc + 1] ? quant_map[mbr + 1][mbc + 1] : quant_map[mbr + 1][mbc_left + 1];
if (modified_quantization && chr)
{
QP=MQ_chroma_QP_table[QP];
}
delta = (int) (((int) (*(rec + i - 2 + j * width)) +
(int) (*(rec + i - 1 + j * width) * (-4)) +
(int) (*(rec + i + j * width) * (4)) +
(int) (*(rec + i + 1 + j * width) * (-1))) / 8.0);
d1 = sign (delta) * mmax (0, abs (delta) - mmax (0, 2 * (abs (delta) - STRENGTH[QP - 1])));
d2 = mmin (abs (d1 / 2), mmax (-abs (d1 / 2), (int) ((*(rec + i - 2 + j * width) -
*(rec + i + 1 + j * width)) / 4)));
*(rec + i + 1 + j * width) = (int) (*(rec + i + 1 + j * width)) + d2;
*(rec + i + j * width) =
mmin (255, mmax (0, (int) (*(rec + i + j * width)) - d1));
*(rec + i - 1 + j * width) =
mmin (255, mmax (0, (int) (*(rec + i - 1 + j * width)) + d1));
*(rec + i - 2 + j * width) = (int) (*(rec + i - 2 + j * width)) - d2;
}
}
}
return;
}
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