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Linshizhi
ffmpeg.wasm-core
Commits
4d681269
Commit
4d681269
authored
Jun 28, 2017
by
Paul B Mahol
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avcodec/gdv: add decompression for 2 and 5 method
Signed-off-by:
Paul B Mahol
<
onemda@gmail.com
>
parent
45dbb40c
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Showing
2 changed files
with
148 additions
and
3 deletions
+148
-3
gdv.c
libavcodec/gdv.c
+107
-0
gdv.c
libavformat/gdv.c
+41
-3
No files found.
libavcodec/gdv.c
View file @
4d681269
...
...
@@ -38,6 +38,11 @@ typedef struct GDVContext {
unsigned
scale_h
,
scale_v
;
}
GDVContext
;
typedef
struct
Bits8
{
uint8_t
queue
;
uint8_t
fill
;
}
Bits8
;
typedef
struct
Bits32
{
uint32_t
queue
;
uint8_t
fill
;
...
...
@@ -124,6 +129,21 @@ static void rescale(GDVContext *gdv, uint8_t *dst, int w, int h, int scale_v, in
gdv
->
scale_h
=
scale_h
;
}
static
int
read_bits2
(
Bits8
*
bits
,
GetByteContext
*
gb
)
{
int
res
;
if
(
bits
->
fill
==
0
)
{
bits
->
queue
|=
bytestream2_get_byte
(
gb
);
bits
->
fill
=
8
;
}
res
=
bits
->
queue
>>
6
;
bits
->
queue
<<=
2
;
bits
->
fill
-=
2
;
return
res
;
}
static
void
fill_bits32
(
Bits32
*
bits
,
GetByteContext
*
gb
)
{
bits
->
queue
=
bytestream2_get_le32
(
gb
);
...
...
@@ -173,6 +193,87 @@ static void lz_copy(PutByteContext *pb, GetByteContext *g2, int offset, unsigned
}
}
static
int
decompress_2
(
AVCodecContext
*
avctx
)
{
GDVContext
*
gdv
=
avctx
->
priv_data
;
GetByteContext
*
gb
=
&
gdv
->
gb
;
GetByteContext
*
g2
=
&
gdv
->
g2
;
PutByteContext
*
pb
=
&
gdv
->
pb
;
Bits8
bits
=
{
0
};
int
c
,
i
;
bytestream2_init
(
g2
,
gdv
->
frame
,
gdv
->
frame_size
);
bytestream2_skip_p
(
pb
,
PREAMBLE_SIZE
);
for
(
c
=
0
;
c
<
256
;
c
++
)
{
for
(
i
=
0
;
i
<
16
;
i
++
)
{
gdv
->
frame
[
c
*
16
+
i
]
=
c
;
}
}
while
(
bytestream2_get_bytes_left_p
(
pb
)
>
0
&&
bytestream2_get_bytes_left
(
gb
)
>
0
)
{
int
tag
=
read_bits2
(
&
bits
,
gb
);
if
(
tag
==
0
)
{
bytestream2_put_byte
(
pb
,
bytestream2_get_byte
(
gb
));
}
else
if
(
tag
==
1
)
{
int
b
=
bytestream2_get_byte
(
gb
);
int
len
=
(
b
&
0xF
)
+
3
;
int
top
=
(
b
>>
4
)
&
0xF
;
int
off
=
(
bytestream2_get_byte
(
gb
)
<<
4
)
+
top
-
4096
;
lz_copy
(
pb
,
g2
,
off
,
len
);
}
else
if
(
tag
==
2
)
{
int
len
=
(
bytestream2_get_byte
(
gb
))
+
2
;
bytestream2_skip_p
(
pb
,
len
);
}
else
{
break
;
}
}
return
0
;
}
static
int
decompress_5
(
AVCodecContext
*
avctx
,
unsigned
skip
)
{
GDVContext
*
gdv
=
avctx
->
priv_data
;
GetByteContext
*
gb
=
&
gdv
->
gb
;
GetByteContext
*
g2
=
&
gdv
->
g2
;
PutByteContext
*
pb
=
&
gdv
->
pb
;
Bits8
bits
=
{
0
};
bytestream2_init
(
g2
,
gdv
->
frame
,
gdv
->
frame_size
);
bytestream2_skip_p
(
pb
,
skip
+
PREAMBLE_SIZE
);
while
(
bytestream2_get_bytes_left_p
(
pb
)
>
0
&&
bytestream2_get_bytes_left
(
gb
)
>
0
)
{
int
tag
=
read_bits2
(
&
bits
,
gb
);
if
(
tag
==
0
)
{
bytestream2_put_byte
(
pb
,
bytestream2_get_byte
(
gb
));
}
else
if
(
tag
==
1
)
{
int
b
=
bytestream2_get_byte
(
gb
);
int
len
=
(
b
&
0xF
)
+
3
;
int
top
=
b
>>
4
;
int
off
=
(
bytestream2_get_byte
(
gb
)
<<
4
)
+
top
-
4096
;
lz_copy
(
pb
,
g2
,
off
,
len
);
}
else
if
(
tag
==
2
)
{
int
len
;
int
b
=
bytestream2_get_byte
(
gb
);
if
(
b
==
0
)
{
break
;
}
if
(
b
!=
0xFF
)
{
len
=
b
;
}
else
{
len
=
bytestream2_get_le16
(
gb
);
}
bytestream2_skip_p
(
pb
,
len
+
1
);
}
else
{
int
b
=
bytestream2_get_byte
(
gb
);
int
len
=
(
b
&
0x3
)
+
2
;
int
off
=
-
(
b
>>
2
)
-
1
;
lz_copy
(
pb
,
g2
,
off
,
len
);
}
}
return
0
;
}
static
int
decompress_68
(
AVCodecContext
*
avctx
,
unsigned
skip
,
unsigned
use8
)
{
GDVContext
*
gdv
=
avctx
->
priv_data
;
...
...
@@ -333,8 +434,14 @@ static int gdv_decode_frame(AVCodecContext *avctx, void *data,
gdv
->
pal
[
i
]
=
0xFFU
<<
24
|
r
<<
18
|
g
<<
10
|
b
<<
2
;
}
break
;
case
2
:
ret
=
decompress_2
(
avctx
);
break
;
case
3
:
break
;
case
5
:
ret
=
decompress_5
(
avctx
,
flags
>>
8
);
break
;
case
6
:
ret
=
decompress_68
(
avctx
,
flags
>>
8
,
0
);
break
;
...
...
libavformat/gdv.c
View file @
4d681269
...
...
@@ -42,14 +42,40 @@ static int gdv_read_probe(AVProbeData *p)
return
0
;
}
struct
{
uint16_t
id
;
uint16_t
width
;
uint16_t
height
;
}
FixedSize
[]
=
{
{
0
,
320
,
200
},
{
1
,
640
,
200
},
{
2
,
320
,
167
},
{
3
,
320
,
180
},
{
4
,
320
,
400
},
{
5
,
320
,
170
},
{
6
,
160
,
85
},
{
7
,
160
,
83
},
{
8
,
160
,
90
},
{
9
,
280
,
128
},
{
10
,
320
,
240
},
{
11
,
320
,
201
},
{
16
,
640
,
400
},
{
17
,
640
,
200
},
{
18
,
640
,
180
},
{
19
,
640
,
167
},
{
20
,
640
,
170
},
{
21
,
320
,
240
}
};
static
int
gdv_read_header
(
AVFormatContext
*
ctx
)
{
GDVContext
*
gdv
=
ctx
->
priv_data
;
AVIOContext
*
pb
=
ctx
->
pb
;
AVStream
*
vst
,
*
ast
;
unsigned
fps
,
snd_flags
,
vid_depth
;
unsigned
fps
,
snd_flags
,
vid_depth
,
size_id
;
avio_skip
(
pb
,
6
);
avio_skip
(
pb
,
4
);
size_id
=
avio_rl16
(
pb
);
vst
=
avformat_new_stream
(
ctx
,
0
);
if
(
!
vst
)
...
...
@@ -91,6 +117,18 @@ static int gdv_read_header(AVFormatContext *ctx)
vst
->
codecpar
->
width
=
avio_rl16
(
pb
);
vst
->
codecpar
->
height
=
avio_rl16
(
pb
);
if
(
vst
->
codecpar
->
width
==
0
||
vst
->
codecpar
->
height
==
0
)
{
int
i
;
for
(
i
=
0
;
i
<
FF_ARRAY_ELEMS
(
FixedSize
)
-
1
;
i
++
)
{
if
(
FixedSize
[
i
].
id
==
size_id
)
break
;
}
vst
->
codecpar
->
width
=
FixedSize
[
i
].
width
;
vst
->
codecpar
->
height
=
FixedSize
[
i
].
height
;
}
avpriv_set_pts_info
(
vst
,
64
,
1
,
fps
);
if
(
vid_depth
&
1
)
{
...
...
@@ -100,7 +138,7 @@ static int gdv_read_header(AVFormatContext *ctx)
unsigned
r
=
avio_r8
(
pb
);
unsigned
g
=
avio_r8
(
pb
);
unsigned
b
=
avio_r8
(
pb
);
gdv
->
pal
[
i
]
=
0xFF
<<
24
|
r
<<
18
|
g
<<
10
|
b
<<
2
;
gdv
->
pal
[
i
]
=
0xFF
U
<<
24
|
r
<<
18
|
g
<<
10
|
b
<<
2
;
}
}
...
...
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