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Linshizhi
ffmpeg.wasm-core
Commits
aa498fef
Commit
aa498fef
authored
Oct 09, 2011
by
Mans Rullgard
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mpeg124: use sign_extend() function
Signed-off-by:
Mans Rullgard
<
mans@mansr.com
>
parent
633ddb85
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Showing
3 changed files
with
6 additions
and
10 deletions
+6
-10
ituh263dec.c
libavcodec/ituh263dec.c
+2
-3
ituh263enc.c
libavcodec/ituh263enc.c
+2
-3
mpeg12.c
libavcodec/mpeg12.c
+2
-4
No files found.
libavcodec/ituh263dec.c
View file @
aa498fef
...
...
@@ -271,7 +271,7 @@ int ff_h263_resync(MpegEncContext *s){
int
h263_decode_motion
(
MpegEncContext
*
s
,
int
pred
,
int
f_code
)
{
int
code
,
val
,
sign
,
shift
,
l
;
int
code
,
val
,
sign
,
shift
;
code
=
get_vlc2
(
&
s
->
gb
,
mv_vlc
.
table
,
MV_VLC_BITS
,
2
);
if
(
code
==
0
)
...
...
@@ -293,8 +293,7 @@ int h263_decode_motion(MpegEncContext * s, int pred, int f_code)
/* modulo decoding */
if
(
!
s
->
h263_long_vectors
)
{
l
=
INT_BIT
-
5
-
f_code
;
val
=
(
val
<<
l
)
>>
l
;
val
=
sign_extend
(
val
,
5
+
f_code
);
}
else
{
/* horrible h263 long vector mode */
if
(
pred
<
-
31
&&
val
<
-
63
)
...
...
libavcodec/ituh263enc.c
View file @
aa498fef
...
...
@@ -657,7 +657,7 @@ void h263_encode_mb(MpegEncContext * s,
void
ff_h263_encode_motion
(
MpegEncContext
*
s
,
int
val
,
int
f_code
)
{
int
range
,
l
,
bit_size
,
sign
,
code
,
bits
;
int
range
,
bit_size
,
sign
,
code
,
bits
;
if
(
val
==
0
)
{
/* zero vector */
...
...
@@ -667,8 +667,7 @@ void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code)
bit_size
=
f_code
-
1
;
range
=
1
<<
bit_size
;
/* modulo encoding */
l
=
INT_BIT
-
6
-
bit_size
;
val
=
(
val
<<
l
)
>>
l
;
val
=
sign_extend
(
val
,
6
+
bit_size
);
sign
=
val
>>
31
;
val
=
(
val
^
sign
)
-
sign
;
sign
&=
1
;
...
...
libavcodec/mpeg12.c
View file @
aa498fef
...
...
@@ -54,7 +54,7 @@ static VLC mv_vlc;
/* as H.263, but only 17 codes */
static
int
mpeg_decode_motion
(
MpegEncContext
*
s
,
int
fcode
,
int
pred
)
{
int
code
,
sign
,
val
,
l
,
shift
;
int
code
,
sign
,
val
,
shift
;
code
=
get_vlc2
(
&
s
->
gb
,
mv_vlc
.
table
,
MV_VLC_BITS
,
2
);
if
(
code
==
0
)
{
...
...
@@ -77,9 +77,7 @@ static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
val
+=
pred
;
/* modulo decoding */
l
=
INT_BIT
-
5
-
shift
;
val
=
(
val
<<
l
)
>>
l
;
return
val
;
return
sign_extend
(
val
,
5
+
shift
);
}
static
inline
int
mpeg1_decode_block_intra
(
MpegEncContext
*
s
,
DCTELEM
*
block
,
int
n
)
...
...
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