GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/h261.c Lines: 9 31 29.0 %
Date: 2021-04-20 15:25:36 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 "avcodec.h"
29
#include "h261.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
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
}