3 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
4 * Copyright (c) 2004 Maarten Daniels
6 * This file is part of FFmpeg.
8 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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
)
40 for (x
= 0; x
< 8; x
++) {
42 temp
[x
+ 7 * 8] = 4 * src
[x
+ 7 * stride
];
44 for (y
= 1; y
< 7; y
++) {
45 for (x
= 0; x
< 8; x
++) {
48 temp
[yz
] = src
[xy
- stride
] + 2 * src
[xy
] + src
[xy
+ stride
];
52 for (y
= 0; y
< 8; y
++) {
53 src
[y
* stride
] = (temp
[y
* 8] + 2) >> 2;
54 src
[y
* stride
+ 7] = (temp
[y
* 8 + 7] + 2) >> 2;
55 for (x
= 1; x
< 7; x
++) {
58 src
[xy
] = (temp
[yz
- 1] + 2 * temp
[yz
] + temp
[yz
+ 1] + 8) >> 4;
63 void ff_h261_loop_filter(MpegEncContext
*s
)
65 H261Context
*h
= (H261Context
*)s
;
66 const int linesize
= s
->linesize
;
67 const int uvlinesize
= s
->uvlinesize
;
68 uint8_t *dest_y
= s
->dest
[0];
69 uint8_t *dest_cb
= s
->dest
[1];
70 uint8_t *dest_cr
= s
->dest
[2];
72 if (!(IS_FIL(h
->mtype
)))
75 h261_loop_filter(dest_y
, linesize
);
76 h261_loop_filter(dest_y
+ 8, linesize
);
77 h261_loop_filter(dest_y
+ 8 * linesize
, linesize
);
78 h261_loop_filter(dest_y
+ 8 * linesize
+ 8, linesize
);
79 h261_loop_filter(dest_cb
, uvlinesize
);
80 h261_loop_filter(dest_cr
, uvlinesize
);
83 av_cold
void ff_h261_common_init(void)
90 ff_init_rl(&ff_h261_rl_tcoeff
, ff_h261_rl_table_store
);