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Linshizhi
ffmpeg.wasm-core
Commits
f7e26cca
Commit
f7e26cca
authored
Jul 11, 2012
by
Paul B Mahol
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exr: rle decompression
Signed-off-by:
Paul B Mahol
<
onemda@gmail.com
>
parent
26d72327
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1 changed file
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46 additions
and
1 deletion
+46
-1
exr.c
libavcodec/exr.c
+46
-1
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libavcodec/exr.c
View file @
f7e26cca
...
...
@@ -34,6 +34,7 @@
#include "avcodec.h"
#include "bytestream.h"
#include "mathops.h"
#include "libavutil/imgutils.h"
enum
ExrCompr
{
...
...
@@ -183,6 +184,42 @@ static void reorder_pixels(uint8_t *src, uint8_t *dst, int size)
}
}
static
int
rle_uncompress
(
const
uint8_t
*
src
,
int
ssize
,
uint8_t
*
dst
,
int
dsize
)
{
int8_t
*
d
=
(
int8_t
*
)
dst
;
int8_t
*
s
=
(
int8_t
*
)
src
;
int8_t
*
dend
=
d
+
dsize
;
int
count
;
while
(
ssize
>
0
)
{
count
=
*
s
++
;
if
(
count
<
0
)
{
count
=
-
count
;
if
((
dsize
-=
count
)
<
0
||
(
ssize
-=
count
+
1
)
<
0
)
return
-
1
;
while
(
count
--
)
*
d
++
=
*
s
++
;
}
else
{
count
++
;
if
((
dsize
-=
count
)
<
0
||
(
ssize
-=
2
)
<
0
)
return
-
1
;
while
(
count
--
)
*
d
++
=
*
s
;
s
++
;
}
}
return
dend
!=
d
;
}
static
int
decode_frame
(
AVCodecContext
*
avctx
,
void
*
data
,
int
*
data_size
,
...
...
@@ -366,10 +403,10 @@ static int decode_frame(AVCodecContext *avctx,
s
->
compr
=
*
buf
;
switch
(
s
->
compr
)
{
case
EXR_RAW
:
case
EXR_RLE
:
case
EXR_ZIP1
:
case
EXR_ZIP16
:
break
;
case
EXR_RLE
:
case
EXR_PIZ
:
case
EXR_B44
:
default:
...
...
@@ -431,6 +468,7 @@ static int decode_frame(AVCodecContext *avctx,
switch
(
s
->
compr
)
{
case
EXR_RAW
:
case
EXR_RLE
:
case
EXR_ZIP1
:
scan_lines_per_block
=
1
;
break
;
...
...
@@ -508,7 +546,14 @@ static int decode_frame(AVCodecContext *avctx,
av_log
(
avctx
,
AV_LOG_ERROR
,
"error during zlib decompression
\n
"
);
return
AVERROR
(
EINVAL
);
}
}
else
if
(
s
->
compr
==
EXR_RLE
&&
data_size
<
uncompressed_size
)
{
if
(
rle_uncompress
(
avpkt
->
data
+
line_offset
,
data_size
,
s
->
tmp
,
uncompressed_size
))
{
av_log
(
avctx
,
AV_LOG_ERROR
,
"error during rle decompression
\n
"
);
return
AVERROR
(
EINVAL
);
}
}
if
(
s
->
compr
!=
EXR_RAW
&&
data_size
<
uncompressed_size
)
{
predictor
(
s
->
tmp
,
uncompressed_size
);
reorder_pixels
(
s
->
tmp
,
s
->
uncompressed_data
,
uncompressed_size
);
...
...
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