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7dca334d
编写于
9月 06, 2009
作者:
S
Sascha Sommer
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电子邮件补丁
差异文件
avoid extra memcpy during scale factor decoding
Originally committed as revision 19777 to
svn://svn.ffmpeg.org/ffmpeg/trunk
上级
d31dbec3
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
9 addition
and
10 deletion
+9
-10
libavcodec/wmaprodec.c
libavcodec/wmaprodec.c
+9
-10
未找到文件。
libavcodec/wmaprodec.c
浏览文件 @
7dca334d
...
...
@@ -137,8 +137,9 @@ typedef struct {
int8_t
reuse_sf
;
///< share scale factors between subframes
int8_t
scale_factor_step
;
///< scaling step for the current subframe
int
max_scale_factor
;
///< maximum scale factor for the current subframe
int
scale_factors
[
MAX_BANDS
];
///< scale factor values for the current subframe
int
saved_scale_factors
[
MAX_BANDS
];
///< scale factors from a previous subframe
int
saved_scale_factors
[
2
][
MAX_BANDS
];
///< resampled and (previously) transmitted scale factor values
int8_t
scale_factor_idx
;
///< index for the transmitted scale factor values (used for resampling)
int
*
scale_factors
;
///< pointer to the scale factor values used for decoding
uint8_t
table_idx
;
///< index in sf_offsets for the scale factor reference block
float
*
coeffs
;
///< pointer to the subframe decode buffer
DECLARE_ALIGNED_16
(
float
,
out
[
WMAPRO_BLOCK_MAX_SIZE
+
WMAPRO_BLOCK_MAX_SIZE
/
2
]);
///< output buffer
...
...
@@ -860,7 +861,9 @@ static int decode_scale_factors(WMAProDecodeCtx* s)
for
(
i
=
0
;
i
<
s
->
channels_for_cur_subframe
;
i
++
)
{
int
c
=
s
->
channel_indexes_for_cur_subframe
[
i
];
int
*
sf
;
int
*
sf_end
=
s
->
channel
[
c
].
scale_factors
+
s
->
num_bands
;
int
*
sf_end
;
s
->
channel
[
c
].
scale_factors
=
s
->
channel
[
c
].
saved_scale_factors
[
!
s
->
channel
[
c
].
scale_factor_idx
];
sf_end
=
s
->
channel
[
c
].
scale_factors
+
s
->
num_bands
;
/** resample scale factors for the new block size
* as the scale factors might need to be resampled several times
...
...
@@ -872,7 +875,7 @@ static int decode_scale_factors(WMAProDecodeCtx* s)
int
b
;
for
(
b
=
0
;
b
<
s
->
num_bands
;
b
++
)
s
->
channel
[
c
].
scale_factors
[
b
]
=
s
->
channel
[
c
].
saved_scale_factors
[
*
sf_offsets
++
];
s
->
channel
[
c
].
saved_scale_factors
[
s
->
channel
[
c
].
scale_factor_idx
]
[
*
sf_offsets
++
];
}
if
(
!
s
->
channel
[
c
].
cur_subframe
||
get_bits1
(
&
s
->
gb
))
{
...
...
@@ -919,12 +922,8 @@ static int decode_scale_factors(WMAProDecodeCtx* s)
s
->
channel
[
c
].
scale_factors
[
i
]
+=
(
val
^
sign
)
-
sign
;
}
}
/** save transmitted scale factors so that they can be reused for
the next subframe */
memcpy
(
s
->
channel
[
c
].
saved_scale_factors
,
s
->
channel
[
c
].
scale_factors
,
s
->
num_bands
*
sizeof
(
*
s
->
channel
[
c
].
saved_scale_factors
));
/** swap buffers */
s
->
channel
[
c
].
scale_factor_idx
=
!
s
->
channel
[
c
].
scale_factor_idx
;
s
->
channel
[
c
].
table_idx
=
s
->
table_idx
;
s
->
channel
[
c
].
reuse_sf
=
1
;
}
...
...
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