FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h261.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 9 31 29.0%
Branches: 1 12 8.3%

Line Branch Exec Source
1 /*
2 * H.261 common code
3 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
4 * Copyright (c) 2004 Maarten Daniels
5 *
6 * This file is part of FFmpeg.
7 *
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.
12 *
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.
17 *
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
21 */
22
23 /**
24 * @file
25 * H.261 codec
26 */
27
28 #include "h261.h"
29 #include "mpegvideo.h"
30
31 #define IS_FIL(a) ((a) & MB_TYPE_H261_FIL)
32
33 static void h261_loop_filter(uint8_t *src, int stride)
34 {
35 int x, y, xy, yz;
36 int temp[64];
37
38 for (x = 0; x < 8; x++) {
39 temp[x] = 4 * src[x];
40 temp[x + 7 * 8] = 4 * src[x + 7 * stride];
41 }
42 for (y = 1; y < 7; y++) {
43 for (x = 0; x < 8; x++) {
44 xy = y * stride + x;
45 yz = y * 8 + x;
46 temp[yz] = src[xy - stride] + 2 * src[xy] + src[xy + stride];
47 }
48 }
49
50 for (y = 0; y < 8; y++) {
51 src[y * stride] = (temp[y * 8] + 2) >> 2;
52 src[y * stride + 7] = (temp[y * 8 + 7] + 2) >> 2;
53 for (x = 1; x < 7; x++) {
54 xy = y * stride + x;
55 yz = y * 8 + x;
56 src[xy] = (temp[yz - 1] + 2 * temp[yz] + temp[yz + 1] + 8) >> 4;
57 }
58 }
59 }
60
61 205957 void ff_h261_loop_filter(MpegEncContext *s)
62 {
63 205957 H261Context *h = (H261Context *)s;
64 205957 const int linesize = s->linesize;
65 205957 const int uvlinesize = s->uvlinesize;
66 205957 uint8_t *dest_y = s->dest[0];
67 205957 uint8_t *dest_cb = s->dest[1];
68 205957 uint8_t *dest_cr = s->dest[2];
69
70
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205957 if (!(IS_FIL(h->mtype)))
71 205957 return;
72
73 h261_loop_filter(dest_y, linesize);
74 h261_loop_filter(dest_y + 8, linesize);
75 h261_loop_filter(dest_y + 8 * linesize, linesize);
76 h261_loop_filter(dest_y + 8 * linesize + 8, linesize);
77 h261_loop_filter(dest_cb, uvlinesize);
78 h261_loop_filter(dest_cr, uvlinesize);
79 }
80