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submodule
ffmpeg
Commits
3f3c3318
Commit
3f3c3318
authored
May 03, 2014
by
Clément Bœsch
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avfilter/edgedetect: make processing functions context free.
parent
3c3e02b8
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Showing
1 changed file
with
18 additions
and
15 deletions
+18
-15
vf_edgedetect.c
libavfilter/vf_edgedetect.c
+18
-15
No files found.
libavfilter/vf_edgedetect.c
View file @
3f3c3318
...
...
@@ -154,15 +154,16 @@ static int get_rounded_direction(int gx, int gy)
return
DIRECTION_VERTICAL
;
}
static
void
sobel
(
AVFilterContext
*
ctx
,
int
w
,
int
h
,
uint16_t
*
dst
,
int
dst_linesize
,
const
uint8_t
*
src
,
int
src_linesize
)
static
void
sobel
(
int
w
,
int
h
,
uint16_t
*
dst
,
int
dst_linesize
,
int8_t
*
dir
,
int
dir_linesize
,
const
uint8_t
*
src
,
int
src_linesize
)
{
int
i
,
j
;
EdgeDetectContext
*
edgedetect
=
ctx
->
priv
;
for
(
j
=
1
;
j
<
h
-
1
;
j
++
)
{
dst
+=
dst_linesize
;
dir
+=
dir_linesize
;
src
+=
src_linesize
;
for
(
i
=
1
;
i
<
w
-
1
;
i
++
)
{
const
int
gx
=
...
...
@@ -175,17 +176,17 @@ static void sobel(AVFilterContext *ctx, int w, int h,
-
1
*
src
[
-
src_linesize
+
i
+
1
]
+
1
*
src
[
src_linesize
+
i
+
1
];
dst
[
i
]
=
FFABS
(
gx
)
+
FFABS
(
gy
);
edgedetect
->
directions
[
j
*
w
+
i
]
=
get_rounded_direction
(
gx
,
gy
);
dir
[
i
]
=
get_rounded_direction
(
gx
,
gy
);
}
}
}
static
void
non_maximum_suppression
(
AVFilterContext
*
ctx
,
int
w
,
int
h
,
static
void
non_maximum_suppression
(
int
w
,
int
h
,
uint8_t
*
dst
,
int
dst_linesize
,
const
int8_t
*
dir
,
int
dir_linesize
,
const
uint16_t
*
src
,
int
src_linesize
)
{
int
i
,
j
;
EdgeDetectContext
*
edgedetect
=
ctx
->
priv
;
#define COPY_MAXIMA(ay, ax, by, bx) do { \
if (src[i] > src[(ay)*src_linesize + i+(ax)] && \
...
...
@@ -195,9 +196,10 @@ static void non_maximum_suppression(AVFilterContext *ctx, int w, int h,
for
(
j
=
1
;
j
<
h
-
1
;
j
++
)
{
dst
+=
dst_linesize
;
dir
+=
dir_linesize
;
src
+=
src_linesize
;
for
(
i
=
1
;
i
<
w
-
1
;
i
++
)
{
switch
(
edgedetect
->
directions
[
j
*
w
+
i
])
{
switch
(
dir
[
i
])
{
case
DIRECTION_45UP
:
COPY_MAXIMA
(
1
,
-
1
,
-
1
,
1
);
break
;
case
DIRECTION_45DOWN
:
COPY_MAXIMA
(
-
1
,
-
1
,
1
,
1
);
break
;
case
DIRECTION_HORIZONTAL
:
COPY_MAXIMA
(
0
,
-
1
,
0
,
1
);
break
;
...
...
@@ -207,14 +209,11 @@ static void non_maximum_suppression(AVFilterContext *ctx, int w, int h,
}
}
static
void
double_threshold
(
AVFilterContext
*
ctx
,
int
w
,
int
h
,
static
void
double_threshold
(
int
low
,
int
high
,
int
w
,
int
h
,
uint8_t
*
dst
,
int
dst_linesize
,
const
uint8_t
*
src
,
int
src_linesize
)
{
int
i
,
j
;
EdgeDetectContext
*
edgedetect
=
ctx
->
priv
;
const
int
low
=
edgedetect
->
low_u8
;
const
int
high
=
edgedetect
->
high_u8
;
for
(
j
=
0
;
j
<
h
;
j
++
)
{
for
(
i
=
0
;
i
<
w
;
i
++
)
{
...
...
@@ -249,6 +248,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFilterLink
*
outlink
=
inlink
->
dst
->
outputs
[
0
];
uint8_t
*
tmpbuf
=
edgedetect
->
tmpbuf
;
uint16_t
*
gradients
=
edgedetect
->
gradients
;
int8_t
*
directions
=
edgedetect
->
directions
;
int
direct
=
0
;
AVFrame
*
out
;
...
...
@@ -270,19 +270,22 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
in
->
data
[
0
],
in
->
linesize
[
0
]);
/* compute the 16-bits gradients and directions for the next step */
sobel
(
ctx
,
inlink
->
w
,
inlink
->
h
,
sobel
(
inlink
->
w
,
inlink
->
h
,
gradients
,
inlink
->
w
,
directions
,
inlink
->
w
,
tmpbuf
,
inlink
->
w
);
/* non_maximum_suppression() will actually keep & clip what's necessary and
* ignore the rest, so we need a clean output buffer */
memset
(
tmpbuf
,
0
,
inlink
->
w
*
inlink
->
h
);
non_maximum_suppression
(
ctx
,
inlink
->
w
,
inlink
->
h
,
non_maximum_suppression
(
inlink
->
w
,
inlink
->
h
,
tmpbuf
,
inlink
->
w
,
directions
,
inlink
->
w
,
gradients
,
inlink
->
w
);
/* keep high values, or low values surrounded by high values */
double_threshold
(
ctx
,
inlink
->
w
,
inlink
->
h
,
double_threshold
(
edgedetect
->
low_u8
,
edgedetect
->
high_u8
,
inlink
->
w
,
inlink
->
h
,
out
->
data
[
0
],
out
->
linesize
[
0
],
tmpbuf
,
inlink
->
w
);
...
...
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