FFmpeg
Main Page
Related Pages
Modules
Namespaces
Data Structures
Files
Examples
File List
Globals
All
Data Structures
Namespaces
Files
Functions
Variables
Typedefs
Enumerations
Enumerator
Macros
Groups
Pages
libavfilter
vf_vflip.c
Go to the documentation of this file.
1
/*
2
* Copyright (c) 2007 Bobby Bingham
3
*
4
* This file is part of FFmpeg.
5
*
6
* FFmpeg is free software; you can redistribute it and/or
7
* modify it under the terms of the GNU Lesser General Public
8
* License as published by the Free Software Foundation; either
9
* version 2.1 of the License, or (at your option) any later version.
10
*
11
* FFmpeg is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14
* Lesser General Public License for more details.
15
*
16
* You should have received a copy of the GNU Lesser General Public
17
* License along with FFmpeg; if not, write to the Free Software
18
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
*/
20
21
/**
22
* @file
23
* video vertical flip filter
24
*/
25
26
#include "
libavutil/internal.h
"
27
#include "
libavutil/pixdesc.h
"
28
#include "
avfilter.h
"
29
#include "
internal.h
"
30
#include "
video.h
"
31
32
typedef
struct
{
33
int
vsub;
///< vertical chroma subsampling
34
}
FlipContext
;
35
36
static
int
config_input
(
AVFilterLink
*link)
37
{
38
FlipContext
*
flip
= link->
dst
->
priv
;
39
const
AVPixFmtDescriptor
*desc =
av_pix_fmt_desc_get
(link->
format
);
40
41
flip->
vsub
= desc->
log2_chroma_h
;
42
43
return
0;
44
}
45
46
static
AVFrame
*
get_video_buffer
(
AVFilterLink
*link,
int
w,
int
h)
47
{
48
FlipContext
*
flip
= link->
dst
->
priv
;
49
AVFrame
*
frame
;
50
int
i;
51
52
frame =
ff_get_video_buffer
(link->
dst
->
outputs
[0], w, h);
53
if
(!frame)
54
return
NULL;
55
56
for
(i = 0; i < 4; i ++) {
57
int
vsub = i == 1 || i == 2 ? flip->
vsub
: 0;
58
int
height
=
FF_CEIL_RSHIFT
(h, vsub);
59
60
if
(frame->
data
[i]) {
61
frame->
data
[i] += (height - 1) * frame->
linesize
[i];
62
frame->
linesize
[i] = -frame->
linesize
[i];
63
}
64
}
65
66
return
frame
;
67
}
68
69
static
int
filter_frame
(
AVFilterLink
*link,
AVFrame
*
frame
)
70
{
71
FlipContext
*
flip
= link->
dst
->
priv
;
72
int
i;
73
74
for
(i = 0; i < 4; i ++) {
75
int
vsub = i == 1 || i == 2 ? flip->
vsub
: 0;
76
int
height
=
FF_CEIL_RSHIFT
(link->
h
, vsub);
77
78
if
(frame->
data
[i]) {
79
frame->
data
[i] += (height - 1) * frame->
linesize
[i];
80
frame->
linesize
[i] = -frame->
linesize
[i];
81
}
82
}
83
84
return
ff_filter_frame
(link->
dst
->
outputs
[0], frame);
85
}
86
static
const
AVFilterPad
avfilter_vf_vflip_inputs
[] = {
87
{
88
.
name
=
"default"
,
89
.type =
AVMEDIA_TYPE_VIDEO
,
90
.get_video_buffer =
get_video_buffer
,
91
.filter_frame =
filter_frame
,
92
.config_props =
config_input
,
93
},
94
{ NULL }
95
};
96
97
static
const
AVFilterPad
avfilter_vf_vflip_outputs
[] = {
98
{
99
.
name
=
"default"
,
100
.type =
AVMEDIA_TYPE_VIDEO
,
101
},
102
{ NULL }
103
};
104
105
AVFilter
avfilter_vf_vflip
= {
106
.
name
=
"vflip"
,
107
.description =
NULL_IF_CONFIG_SMALL
(
"Flip the input video vertically."
),
108
109
.priv_size =
sizeof
(
FlipContext
),
110
111
.
inputs
= avfilter_vf_vflip_inputs,
112
.
outputs
= avfilter_vf_vflip_outputs,
113
};
Generated on Wed Jul 10 2013 23:48:11 for FFmpeg by
1.8.2