1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
* Copyright (c) 2007 Bobby Bingham
*
* 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
* video vertical flip filter
*/
#include "libavutil/internal.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
typedef struct {
int vsub; ///< vertical chroma subsampling
} FlipContext;
static int config_input(AVFilterLink *link)
{
FlipContext *flip = link->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
flip->vsub = desc->log2_chroma_h;
return 0;
}
static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
{
FlipContext *flip = link->dst->priv;
AVFrame *frame;
int i;
frame = ff_get_video_buffer(link->dst->outputs[0], w, h);
if (!frame)
return NULL;
for (i = 0; i < 4; i ++) {
int vsub = i == 1 || i == 2 ? flip->vsub : 0;
if (frame->data[i]) {
frame->data[i] += ((h >> vsub) - 1) * frame->linesize[i];
frame->linesize[i] = -frame->linesize[i];
}
}
return frame;
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
FlipContext *flip = link->dst->priv;
int i;
for (i = 0; i < 4; i ++) {
int vsub = i == 1 || i == 2 ? flip->vsub : 0;
if (frame->data[i]) {
frame->data[i] += ((link->h >> vsub)-1) * frame->linesize[i];
frame->linesize[i] = -frame->linesize[i];
}
}
return ff_filter_frame(link->dst->outputs[0], frame);
}
static const AVFilterPad avfilter_vf_vflip_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.get_video_buffer = get_video_buffer,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_vflip_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter avfilter_vf_vflip = {
.name = "vflip",
.description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."),
.priv_size = sizeof(FlipContext),
.inputs = avfilter_vf_vflip_inputs,
.outputs = avfilter_vf_vflip_outputs,
};
|
