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Linshizhi
ffmpeg.wasm-core
Commits
d744801f
Commit
d744801f
authored
Jan 08, 2013
by
Alexandra Khirnova
Committed by
Diego Biurrun
Jan 09, 2013
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Plain Diff
xan: Convert to bytestream2
Signed-off-by:
Diego Biurrun
<
diego@biurrun.de
>
parent
59220d55
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1 changed file
with
31 additions
and
27 deletions
+31
-27
xan.c
libavcodec/xan.c
+31
-27
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libavcodec/xan.c
View file @
d744801f
...
@@ -140,44 +140,47 @@ static void xan_unpack(unsigned char *dest, int dest_len,
...
@@ -140,44 +140,47 @@ static void xan_unpack(unsigned char *dest, int dest_len,
int
size
;
int
size
;
unsigned
char
*
dest_org
=
dest
;
unsigned
char
*
dest_org
=
dest
;
unsigned
char
*
dest_end
=
dest
+
dest_len
;
unsigned
char
*
dest_end
=
dest
+
dest_len
;
const
unsigned
char
*
src_end
=
src
+
src_len
;
GetByteContext
ctx
;
while
(
dest
<
dest_end
&&
src
<
src_end
)
{
bytestream2_init
(
&
ctx
,
src
,
src_len
);
opcode
=
*
src
++
;
while
(
dest
<
dest_end
&&
bytestream2_get_bytes_left
(
&
ctx
))
{
opcode
=
bytestream2_get_byte
(
&
ctx
);
if
(
opcode
<
0xe0
)
{
if
(
opcode
<
0xe0
)
{
int
size2
,
back
;
int
size2
,
back
;
if
((
opcode
&
0x80
)
==
0
)
{
if
((
opcode
&
0x80
)
==
0
)
{
size
=
opcode
&
3
;
size
=
opcode
&
3
;
back
=
((
opcode
&
0x60
)
<<
3
)
+
*
src
++
+
1
;
back
=
((
opcode
&
0x60
)
<<
3
)
+
bytestream2_get_byte
(
&
ctx
)
+
1
;
size2
=
((
opcode
&
0x1c
)
>>
2
)
+
3
;
size2
=
((
opcode
&
0x1c
)
>>
2
)
+
3
;
}
else
if
((
opcode
&
0x40
)
==
0
)
{
}
else
if
((
opcode
&
0x40
)
==
0
)
{
size
=
*
src
>>
6
;
size
=
bytestream2_peek_byte
(
&
ctx
)
>>
6
;
back
=
(
bytestream
_get_be16
(
&
src
)
&
0x3fff
)
+
1
;
back
=
(
bytestream
2_get_be16
(
&
ctx
)
&
0x3fff
)
+
1
;
size2
=
(
opcode
&
0x3f
)
+
4
;
size2
=
(
opcode
&
0x3f
)
+
4
;
}
else
{
}
else
{
size
=
opcode
&
3
;
size
=
opcode
&
3
;
back
=
((
opcode
&
0x10
)
<<
12
)
+
bytestream
_get_be16
(
&
src
)
+
1
;
back
=
((
opcode
&
0x10
)
<<
12
)
+
bytestream
2_get_be16
(
&
ctx
)
+
1
;
size2
=
((
opcode
&
0x0c
)
<<
6
)
+
*
src
++
+
5
;
size2
=
((
opcode
&
0x0c
)
<<
6
)
+
bytestream2_get_byte
(
&
ctx
)
+
5
;
}
}
if
(
dest_end
-
dest
<
size
+
size2
||
if
(
dest_end
-
dest
<
size
+
size2
||
dest
+
size
-
dest_org
<
back
||
dest
+
size
-
dest_org
<
back
||
src_end
-
src
<
size
)
bytestream2_get_bytes_left
(
&
ctx
)
<
size
)
return
;
return
;
memcpy
(
dest
,
src
,
size
);
dest
+=
size
;
src
+=
size
;
bytestream2_get_buffer
(
&
ctx
,
dest
,
size
);
dest
+=
size
;
av_memcpy_backptr
(
dest
,
back
,
size2
);
av_memcpy_backptr
(
dest
,
back
,
size2
);
dest
+=
size2
;
dest
+=
size2
;
}
else
{
}
else
{
int
finish
=
opcode
>=
0xfc
;
int
finish
=
opcode
>=
0xfc
;
size
=
finish
?
opcode
&
3
:
((
opcode
&
0x1f
)
<<
2
)
+
4
;
size
=
finish
?
opcode
&
3
:
((
opcode
&
0x1f
)
<<
2
)
+
4
;
if
(
dest_end
-
dest
<
size
||
src_end
-
src
<
size
)
if
(
dest_end
-
dest
<
size
||
bytestream2_get_bytes_left
(
&
ctx
)
<
size
)
return
;
return
;
memcpy
(
dest
,
src
,
size
);
dest
+=
size
;
src
+=
size
;
bytestream2_get_buffer
(
&
ctx
,
dest
,
size
);
dest
+=
size
;
if
(
finish
)
if
(
finish
)
return
;
return
;
}
}
...
@@ -499,17 +502,18 @@ static int xan_decode_frame(AVCodecContext *avctx,
...
@@ -499,17 +502,18 @@ static int xan_decode_frame(AVCodecContext *avctx,
const
uint8_t
*
buf
=
avpkt
->
data
;
const
uint8_t
*
buf
=
avpkt
->
data
;
int
ret
,
buf_size
=
avpkt
->
size
;
int
ret
,
buf_size
=
avpkt
->
size
;
XanContext
*
s
=
avctx
->
priv_data
;
XanContext
*
s
=
avctx
->
priv_data
;
const
uint8_t
*
buf_end
=
buf
+
buf_size
;
GetByteContext
ctx
;
int
tag
=
0
;
int
tag
=
0
;
while
(
buf_end
-
buf
>
8
&&
tag
!=
VGA__TAG
)
{
bytestream2_init
(
&
ctx
,
buf
,
buf_size
);
while
(
bytestream2_get_bytes_left
(
&
ctx
)
>
8
&&
tag
!=
VGA__TAG
)
{
unsigned
*
tmpptr
;
unsigned
*
tmpptr
;
uint32_t
new_pal
;
uint32_t
new_pal
;
int
size
;
int
size
;
int
i
;
int
i
;
tag
=
bytestream
_get_le32
(
&
buf
);
tag
=
bytestream
2_get_le32
(
&
ctx
);
size
=
bytestream
_get_be32
(
&
buf
);
size
=
bytestream
2_get_be32
(
&
ctx
);
size
=
FFMIN
(
size
,
b
uf_end
-
buf
);
size
=
FFMIN
(
size
,
b
ytestream2_get_bytes_left
(
&
ctx
)
);
switch
(
tag
)
{
switch
(
tag
)
{
case
PALT_TAG
:
case
PALT_TAG
:
if
(
size
<
PALETTE_SIZE
)
if
(
size
<
PALETTE_SIZE
)
...
@@ -524,13 +528,13 @@ static int xan_decode_frame(AVCodecContext *avctx,
...
@@ -524,13 +528,13 @@ static int xan_decode_frame(AVCodecContext *avctx,
tmpptr
+=
s
->
palettes_count
*
AVPALETTE_COUNT
;
tmpptr
+=
s
->
palettes_count
*
AVPALETTE_COUNT
;
for
(
i
=
0
;
i
<
PALETTE_COUNT
;
i
++
)
{
for
(
i
=
0
;
i
<
PALETTE_COUNT
;
i
++
)
{
#if RUNTIME_GAMMA
#if RUNTIME_GAMMA
int
r
=
gamma_corr
(
*
buf
++
);
int
r
=
gamma_corr
(
bytestream2_get_byteu
(
&
ctx
)
);
int
g
=
gamma_corr
(
*
buf
++
);
int
g
=
gamma_corr
(
bytestream2_get_byteu
(
&
ctx
)
);
int
b
=
gamma_corr
(
*
buf
++
);
int
b
=
gamma_corr
(
bytestream2_get_byteu
(
&
ctx
)
);
#else
#else
int
r
=
gamma_lookup
[
*
buf
++
];
int
r
=
gamma_lookup
[
bytestream2_get_byteu
(
&
ctx
)
];
int
g
=
gamma_lookup
[
*
buf
++
];
int
g
=
gamma_lookup
[
bytestream2_get_byteu
(
&
ctx
)
];
int
b
=
gamma_lookup
[
*
buf
++
];
int
b
=
gamma_lookup
[
bytestream2_get_byteu
(
&
ctx
)
];
#endif
#endif
*
tmpptr
++
=
(
r
<<
16
)
|
(
g
<<
8
)
|
b
;
*
tmpptr
++
=
(
r
<<
16
)
|
(
g
<<
8
)
|
b
;
}
}
...
@@ -539,7 +543,7 @@ static int xan_decode_frame(AVCodecContext *avctx,
...
@@ -539,7 +543,7 @@ static int xan_decode_frame(AVCodecContext *avctx,
case
SHOT_TAG
:
case
SHOT_TAG
:
if
(
size
<
4
)
if
(
size
<
4
)
return
AVERROR_INVALIDDATA
;
return
AVERROR_INVALIDDATA
;
new_pal
=
bytestream
_get_le32
(
&
buf
);
new_pal
=
bytestream
2_get_le32
(
&
ctx
);
if
(
new_pal
<
s
->
palettes_count
)
{
if
(
new_pal
<
s
->
palettes_count
)
{
s
->
cur_palette
=
new_pal
;
s
->
cur_palette
=
new_pal
;
}
else
}
else
...
@@ -548,11 +552,11 @@ static int xan_decode_frame(AVCodecContext *avctx,
...
@@ -548,11 +552,11 @@ static int xan_decode_frame(AVCodecContext *avctx,
case
VGA__TAG
:
case
VGA__TAG
:
break
;
break
;
default:
default:
b
uf
+=
size
;
b
ytestream2_skip
(
&
ctx
,
size
)
;
break
;
break
;
}
}
}
}
buf_size
=
b
uf_end
-
buf
;
buf_size
=
b
ytestream2_get_bytes_left
(
&
ctx
)
;
if
(
s
->
palettes_count
<=
0
)
{
if
(
s
->
palettes_count
<=
0
)
{
av_log
(
s
->
avctx
,
AV_LOG_ERROR
,
"No palette found
\n
"
);
av_log
(
s
->
avctx
,
AV_LOG_ERROR
,
"No palette found
\n
"
);
...
@@ -571,7 +575,7 @@ static int xan_decode_frame(AVCodecContext *avctx,
...
@@ -571,7 +575,7 @@ static int xan_decode_frame(AVCodecContext *avctx,
memcpy
(
s
->
current_frame
.
data
[
1
],
memcpy
(
s
->
current_frame
.
data
[
1
],
s
->
palettes
+
s
->
cur_palette
*
AVPALETTE_COUNT
,
AVPALETTE_SIZE
);
s
->
palettes
+
s
->
cur_palette
*
AVPALETTE_COUNT
,
AVPALETTE_SIZE
);
s
->
buf
=
buf
;
s
->
buf
=
ctx
.
buffer
;
s
->
size
=
buf_size
;
s
->
size
=
buf_size
;
if
(
xan_wc3_decode_frame
(
s
)
<
0
)
if
(
xan_wc3_decode_frame
(
s
)
<
0
)
...
...
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