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体验新版 GitCode,发现更多精彩内容 >>
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62dcdb02
编写于
2月 25, 2013
作者:
A
Anton Khirnov
浏览文件
操作
浏览文件
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电子邮件补丁
差异文件
vf_blackframe: switch to an AVOptions-based system.
上级
2831b307
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
33 addition
and
34 deletion
+33
-34
doc/filters.texi
doc/filters.texi
+10
-8
libavfilter/vf_blackframe.c
libavfilter/vf_blackframe.c
+23
-26
未找到文件。
doc/filters.texi
浏览文件 @
62dcdb02
...
...
@@ -533,16 +533,18 @@ the position in the file if known or -1 and the timestamp in seconds.
In order to display the output lines, you need to set the loglevel at
least to the AV_LOG_INFO value.
The filter accepts the syntax:
@example
blackframe[=@var{amount}:[@var{threshold}]]
@end example
The filter accepts the following options:
@table @option
@item amount
The percentage of the pixels that have to be below the threshold, defaults to
98.
@
var{amount} is the percentage of the pixels that have to be below the
threshold, and defaults to 98
.
@
item threshold
Threshold below which a pixel value is considered black, defaults to 32
.
@var{threshold} is the threshold below which a pixel value is
considered black, and defaults to 32.
@end table
@section boxblur
...
...
libavfilter/vf_blackframe.c
浏览文件 @
62dcdb02
...
...
@@ -31,14 +31,17 @@
#include <inttypes.h>
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef
struct
{
unsigned
int
bamount
;
///< black amount
unsigned
int
bthresh
;
///< black threshold
const
AVClass
*
class
;
int
bamount
;
///< black amount
int
bthresh
;
///< black threshold
unsigned
int
frame
;
///< frame number
unsigned
int
nblack
;
///< number of black pixels counted so far
}
BlackFrameContext
;
...
...
@@ -55,29 +58,6 @@ static int query_formats(AVFilterContext *ctx)
return
0
;
}
static
av_cold
int
init
(
AVFilterContext
*
ctx
,
const
char
*
args
)
{
BlackFrameContext
*
blackframe
=
ctx
->
priv
;
blackframe
->
bamount
=
98
;
blackframe
->
bthresh
=
32
;
blackframe
->
nblack
=
0
;
blackframe
->
frame
=
0
;
if
(
args
)
sscanf
(
args
,
"%u:%u"
,
&
blackframe
->
bamount
,
&
blackframe
->
bthresh
);
av_log
(
ctx
,
AV_LOG_VERBOSE
,
"bamount:%u bthresh:%u
\n
"
,
blackframe
->
bamount
,
blackframe
->
bthresh
);
if
(
blackframe
->
bamount
>
100
||
blackframe
->
bthresh
>
255
)
{
av_log
(
ctx
,
AV_LOG_ERROR
,
"Too big value for bamount (max is 100) or bthresh (max is 255)
\n
"
);
return
AVERROR
(
EINVAL
);
}
return
0
;
}
static
int
filter_frame
(
AVFilterLink
*
inlink
,
AVFrame
*
frame
)
{
AVFilterContext
*
ctx
=
inlink
->
dst
;
...
...
@@ -103,6 +83,23 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
return
ff_filter_frame
(
inlink
->
dst
->
outputs
[
0
],
frame
);
}
#define OFFSET(x) offsetof(BlackFrameContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
static
const
AVOption
options
[]
=
{
{
"amount"
,
"Percentage of the pixels that have to be below the threshold "
"for the frame to be considered black."
,
OFFSET
(
bamount
),
AV_OPT_TYPE_INT
,
{
.
i64
=
98
},
0
,
100
,
FLAGS
},
{
"threshold"
,
"threshold below which a pixel value is considered black"
,
OFFSET
(
bthresh
),
AV_OPT_TYPE_INT
,
{
.
i64
=
32
},
0
,
INT_MAX
,
FLAGS
},
{
NULL
},
};
static
const
AVClass
blackframe_class
=
{
.
class_name
=
"blackframe"
,
.
item_name
=
av_default_item_name
,
.
option
=
options
,
.
version
=
LIBAVUTIL_VERSION_INT
,
};
static
const
AVFilterPad
avfilter_vf_blackframe_inputs
[]
=
{
{
.
name
=
"default"
,
...
...
@@ -126,7 +123,7 @@ AVFilter avfilter_vf_blackframe = {
.
description
=
NULL_IF_CONFIG_SMALL
(
"Detect frames that are (almost) black."
),
.
priv_size
=
sizeof
(
BlackFrameContext
),
.
init
=
init
,
.
priv_class
=
&
blackframe_class
,
.
query_formats
=
query_formats
,
...
...
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