3 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
4 * Copyright (c) 2004 Maarten Daniels
6 * This file is part of Libav.
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31 #define IS_FIL(a) ((a)&MB_TYPE_H261_FIL)
33 uint8_t ff_h261_rl_table_store[2][2*MAX_RUN + MAX_LEVEL + 3];
35 static void h261_loop_filter(uint8_t *src, int stride)
42 temp[x + 7*8] = 4*src[x + 7*stride];
48 temp[yz] = src[xy - stride] + 2*src[xy] + src[xy + stride];
53 src[ y*stride] = (temp[ y*8] + 2)>>2;
54 src[7+y*stride] = (temp[7+y*8] + 2)>>2;
58 src[xy] = (temp[yz-1] + 2*temp[yz] + temp[yz+1] + 8)>>4;
63 void ff_h261_loop_filter(MpegEncContext *s){
64 H261Context * h= (H261Context*)s;
65 const int linesize = s->linesize;
66 const int uvlinesize= s->uvlinesize;
67 uint8_t *dest_y = s->dest[0];
68 uint8_t *dest_cb= s->dest[1];
69 uint8_t *dest_cr= s->dest[2];
71 if(!(IS_FIL (h->mtype)))
74 h261_loop_filter(dest_y, linesize);
75 h261_loop_filter(dest_y + 8, linesize);
76 h261_loop_filter(dest_y + 8 * linesize, linesize);
77 h261_loop_filter(dest_y + 8 * linesize + 8, linesize);
78 h261_loop_filter(dest_cb, uvlinesize);
79 h261_loop_filter(dest_cr, uvlinesize);