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Linshizhi
ffmpeg.wasm-core
Commits
84b6451d
Commit
84b6451d
authored
Sep 03, 2013
by
Michael Niedermayer
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avcodec/vcr1: simplify code, drop buf_size
Signed-off-by:
Michael Niedermayer
<
michaelni@gmx.at
>
parent
a4e70918
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1 changed file
with
4 additions
and
8 deletions
+4
-8
vcr1.c
libavcodec/vcr1.c
+4
-8
No files found.
libavcodec/vcr1.c
View file @
84b6451d
...
...
@@ -50,13 +50,13 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
int
*
got_frame
,
AVPacket
*
avpkt
)
{
const
uint8_t
*
buf
=
avpkt
->
data
;
int
buf_size
=
avpkt
->
size
;
VCR1Context
*
const
a
=
avctx
->
priv_data
;
AVFrame
*
const
p
=
data
;
const
uint8_t
*
bytestream
=
buf
;
const
uint8_t
*
bytestream_end
=
bytestream
+
avpkt
->
size
;
int
i
,
x
,
y
,
ret
;
if
(
buf_
size
<
16
+
avctx
->
height
+
avctx
->
width
*
avctx
->
height
*
5
/
8
){
if
(
avpkt
->
size
<
16
+
avctx
->
height
+
avctx
->
width
*
avctx
->
height
*
5
/
8
){
av_log
(
avctx
,
AV_LOG_ERROR
,
"Insufficient input data.
\n
"
);
return
AVERROR
(
EINVAL
);
}
...
...
@@ -69,7 +69,6 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
for
(
i
=
0
;
i
<
16
;
i
++
)
{
a
->
delta
[
i
]
=
*
bytestream
++
;
bytestream
++
;
buf_size
--
;
}
for
(
y
=
0
;
y
<
avctx
->
height
;
y
++
)
{
...
...
@@ -80,11 +79,10 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
uint8_t
*
cb
=
&
p
->
data
[
1
][(
y
>>
2
)
*
p
->
linesize
[
1
]];
uint8_t
*
cr
=
&
p
->
data
[
2
][(
y
>>
2
)
*
p
->
linesize
[
2
]];
av_assert0
(
b
uf_size
>=
4
+
avctx
->
width
);
av_assert0
(
b
ytestream_end
-
bytestream
>=
4
+
avctx
->
width
);
for
(
i
=
0
;
i
<
4
;
i
++
)
a
->
offset
[
i
]
=
*
bytestream
++
;
buf_size
-=
4
;
offset
=
a
->
offset
[
0
]
-
a
->
delta
[
bytestream
[
2
]
&
0xF
];
for
(
x
=
0
;
x
<
avctx
->
width
;
x
+=
4
)
{
...
...
@@ -98,10 +96,9 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
*
cr
++
=
bytestream
[
1
];
bytestream
+=
4
;
buf_size
-=
4
;
}
}
else
{
av_assert0
(
b
uf_size
>=
avctx
->
width
/
2
);
av_assert0
(
b
ytestream_end
-
bytestream
>=
avctx
->
width
/
2
);
offset
=
a
->
offset
[
y
&
3
]
-
a
->
delta
[
bytestream
[
2
]
&
0xF
];
...
...
@@ -116,7 +113,6 @@ static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
luma
[
7
]
=
offset
+=
a
->
delta
[
bytestream
[
1
]
>>
4
];
luma
+=
8
;
bytestream
+=
4
;
buf_size
-=
4
;
}
}
}
...
...
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