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体验新版 GitCode,发现更多精彩内容 >>
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f76e4787
编写于
8月 27, 2012
作者:
L
Luca Barbato
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
huffman: update to current coding style
上级
125c6c07
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
26 addition
and
21 deletion
+26
-21
libavcodec/huffman.c
libavcodec/huffman.c
+26
-21
未找到文件。
libavcodec/huffman.c
浏览文件 @
f76e4787
...
...
@@ -31,24 +31,26 @@
#define HNODE -1
static
void
get_tree_codes
(
uint32_t
*
bits
,
int16_t
*
lens
,
uint8_t
*
xlat
,
Node
*
nodes
,
int
node
,
uint32_t
pfx
,
int
pl
,
int
*
pos
,
int
no_zero_count
)
static
void
get_tree_codes
(
uint32_t
*
bits
,
int16_t
*
lens
,
uint8_t
*
xlat
,
Node
*
nodes
,
int
node
,
uint32_t
pfx
,
int
pl
,
int
*
pos
,
int
no_zero_count
)
{
int
s
;
s
=
nodes
[
node
].
sym
;
if
(
s
!=
HNODE
||
(
no_zero_count
&&
!
nodes
[
node
].
count
))
{
if
(
s
!=
HNODE
||
(
no_zero_count
&&
!
nodes
[
node
].
count
))
{
bits
[
*
pos
]
=
pfx
;
lens
[
*
pos
]
=
pl
;
xlat
[
*
pos
]
=
s
;
(
*
pos
)
++
;
}
else
{
}
else
{
pfx
<<=
1
;
pl
++
;
get_tree_codes
(
bits
,
lens
,
xlat
,
nodes
,
nodes
[
node
].
n0
,
pfx
,
pl
,
pos
,
no_zero_count
);
get_tree_codes
(
bits
,
lens
,
xlat
,
nodes
,
nodes
[
node
].
n0
,
pfx
,
pl
,
pos
,
no_zero_count
);
pfx
|=
1
;
get_tree_codes
(
bits
,
lens
,
xlat
,
nodes
,
nodes
[
node
].
n0
+
1
,
pfx
,
pl
,
pos
,
no_zero_count
);
get_tree_codes
(
bits
,
lens
,
xlat
,
nodes
,
nodes
[
node
].
n0
+
1
,
pfx
,
pl
,
pos
,
no_zero_count
);
}
}
...
...
@@ -60,7 +62,8 @@ static int build_huff_tree(VLC *vlc, Node *nodes, int head, int flags)
uint8_t
xlat
[
256
];
int
pos
=
0
;
get_tree_codes
(
bits
,
lens
,
xlat
,
nodes
,
head
,
0
,
0
,
&
pos
,
no_zero_count
);
get_tree_codes
(
bits
,
lens
,
xlat
,
nodes
,
head
,
0
,
0
,
&
pos
,
no_zero_count
);
return
ff_init_vlc_sparse
(
vlc
,
9
,
pos
,
lens
,
2
,
2
,
bits
,
4
,
4
,
xlat
,
1
,
1
,
0
);
}
...
...
@@ -76,35 +79,37 @@ int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes,
int
cur_node
;
int64_t
sum
=
0
;
for
(
i
=
0
;
i
<
nb_codes
;
i
++
)
{
for
(
i
=
0
;
i
<
nb_codes
;
i
++
)
{
nodes
[
i
].
sym
=
i
;
nodes
[
i
].
n0
=
-
2
;
sum
+=
nodes
[
i
].
count
;
}
if
(
sum
>>
31
)
{
av_log
(
avctx
,
AV_LOG_ERROR
,
"Too high symbol frequencies. Tree construction is not possible
\n
"
);
if
(
sum
>>
31
)
{
av_log
(
avctx
,
AV_LOG_ERROR
,
"Too high symbol frequencies. "
"Tree construction is not possible
\n
"
);
return
-
1
;
}
qsort
(
nodes
,
nb_codes
,
sizeof
(
Node
),
cmp
);
cur_node
=
nb_codes
;
nodes
[
nb_codes
*
2
-
1
].
count
=
0
;
for
(
i
=
0
;
i
<
nb_codes
*
2
-
1
;
i
+=
2
)
{
for
(
i
=
0
;
i
<
nb_codes
*
2
-
1
;
i
+=
2
)
{
nodes
[
cur_node
].
sym
=
HNODE
;
nodes
[
cur_node
].
count
=
nodes
[
i
].
count
+
nodes
[
i
+
1
].
count
;
nodes
[
cur_node
].
count
=
nodes
[
i
].
count
+
nodes
[
i
+
1
].
count
;
nodes
[
cur_node
].
n0
=
i
;
for
(
j
=
cur_node
;
j
>
0
;
j
--
)
{
if
(
nodes
[
j
].
count
>
nodes
[
j
-
1
].
count
||
(
nodes
[
j
].
count
==
nodes
[
j
-
1
].
count
&&
(
!
(
flags
&
FF_HUFFMAN_FLAG_HNODE_FIRST
)
||
nodes
[
j
].
n0
==
j
-
1
||
nodes
[
j
].
n0
==
j
-
2
||
(
nodes
[
j
].
sym
!=
HNODE
&&
nodes
[
j
-
1
].
sym
!=
HNODE
))))
for
(
j
=
cur_node
;
j
>
0
;
j
--
)
{
if
(
nodes
[
j
].
count
>
nodes
[
j
-
1
].
count
||
(
nodes
[
j
].
count
==
nodes
[
j
-
1
].
count
&&
(
!
(
flags
&
FF_HUFFMAN_FLAG_HNODE_FIRST
)
||
nodes
[
j
].
n0
==
j
-
1
||
nodes
[
j
].
n0
==
j
-
2
||
(
nodes
[
j
].
sym
!=
HNODE
&&
nodes
[
j
-
1
].
sym
!=
HNODE
))))
break
;
FFSWAP
(
Node
,
nodes
[
j
],
nodes
[
j
-
1
]);
FFSWAP
(
Node
,
nodes
[
j
],
nodes
[
j
-
1
]);
}
cur_node
++
;
}
if
(
build_huff_tree
(
vlc
,
nodes
,
nb_codes
*
2
-
2
,
flags
)
<
0
)
{
if
(
build_huff_tree
(
vlc
,
nodes
,
nb_codes
*
2
-
2
,
flags
)
<
0
)
{
av_log
(
avctx
,
AV_LOG_ERROR
,
"Error building tree
\n
"
);
return
-
1
;
}
...
...
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