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/*
* H261 common code
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2004 Maarten Daniels
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* h261codec.
*/
#include "avcodec.h"
#include "h261.h"
#define IS_FIL(a) ((a)&MB_TYPE_H261_FIL)
uint8_t ff_h261_rl_table_store[2][2*MAX_RUN + MAX_LEVEL + 3];
static void h261_loop_filter(uint8_t *src, int stride)
{
int x,y,xy,yz;
int temp[64];
for(x=0; x<8; x++){
temp[x ] = 4*src[x ];
temp[x + 7*8] = 4*src[x + 7*stride];
}
for(y=1; y<7; y++){
for(x=0; x<8; x++){
xy = y * stride + x;
yz = y * 8 + x;
temp[yz] = src[xy - stride] + 2*src[xy] + src[xy + stride];
}
}
for(y=0; y<8; y++){
src[ y*stride] = (temp[ y*8] + 2)>>2;
src[7+y*stride] = (temp[7+y*8] + 2)>>2;
for(x=1; x<7; x++){
xy = y * stride + x;
yz = y * 8 + x;
src[xy] = (temp[yz-1] + 2*temp[yz] + temp[yz+1] + 8)>>4;
}
}
}
void ff_h261_loop_filter(MpegEncContext *s){
H261Context * h= (H261Context*)s;
const int linesize = s->linesize;
const int uvlinesize= s->uvlinesize;
uint8_t *dest_y = s->dest[0];
uint8_t *dest_cb= s->dest[1];
uint8_t *dest_cr= s->dest[2];
if(!(IS_FIL (h->mtype)))
return;
h261_loop_filter(dest_y, linesize);
h261_loop_filter(dest_y + 8, linesize);
h261_loop_filter(dest_y + 8 * linesize, linesize);
h261_loop_filter(dest_y + 8 * linesize + 8, linesize);
h261_loop_filter(dest_cb, uvlinesize);
h261_loop_filter(dest_cr, uvlinesize);
}
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