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体验新版 GitCode,发现更多精彩内容 >>
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dc6ea00c
编写于
10月 28, 2013
作者:
V
Vittorio Giovara
提交者:
Diego Biurrun
11月 01, 2013
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
mpeg4video: K&R formatting cosmetics
Signed-off-by:
N
Diego Biurrun
<
diego@biurrun.de
>
上级
037fea38
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
156 addition
and
129 deletion
+156
-129
libavcodec/mpeg4video.c
libavcodec/mpeg4video.c
+102
-80
libavcodec/mpeg4video.h
libavcodec/mpeg4video.h
+54
-49
未找到文件。
libavcodec/mpeg4video.c
浏览文件 @
dc6ea00c
...
...
@@ -24,19 +24,20 @@
#include "mpeg4video.h"
#include "mpeg4data.h"
uint8_t
ff_mpeg4_static_rl_table_store
[
3
][
2
][
2
*
MAX_RUN
+
MAX_LEVEL
+
3
];
int
ff_mpeg4_get_video_packet_prefix_length
(
MpegEncContext
*
s
){
switch
(
s
->
pict_type
){
case
AV_PICTURE_TYPE_I
:
return
16
;
case
AV_PICTURE_TYPE_P
:
case
AV_PICTURE_TYPE_S
:
return
s
->
f_code
+
15
;
case
AV_PICTURE_TYPE_B
:
return
FFMAX3
(
s
->
f_code
,
s
->
b_code
,
2
)
+
15
;
default:
return
-
1
;
uint8_t
ff_mpeg4_static_rl_table_store
[
3
][
2
][
2
*
MAX_RUN
+
MAX_LEVEL
+
3
];
int
ff_mpeg4_get_video_packet_prefix_length
(
MpegEncContext
*
s
)
{
switch
(
s
->
pict_type
)
{
case
AV_PICTURE_TYPE_I
:
return
16
;
case
AV_PICTURE_TYPE_P
:
case
AV_PICTURE_TYPE_S
:
return
s
->
f_code
+
15
;
case
AV_PICTURE_TYPE_B
:
return
FFMAX3
(
s
->
f_code
,
s
->
b_code
,
2
)
+
15
;
default:
return
-
1
;
}
}
...
...
@@ -44,70 +45,75 @@ void ff_mpeg4_clean_buffers(MpegEncContext *s)
{
int
c_wrap
,
c_xy
,
l_wrap
,
l_xy
;
l_wrap
=
s
->
b8_stride
;
l_xy
=
(
2
*
s
->
mb_y
-
1
)
*
l_wrap
+
s
->
mb_x
*
2
-
1
;
c_wrap
=
s
->
mb_stride
;
c_xy
=
(
s
->
mb_y
-
1
)
*
c_wrap
+
s
->
mb_x
-
1
;
l_wrap
=
s
->
b8_stride
;
l_xy
=
(
2
*
s
->
mb_y
-
1
)
*
l_wrap
+
s
->
mb_x
*
2
-
1
;
c_wrap
=
s
->
mb_stride
;
c_xy
=
(
s
->
mb_y
-
1
)
*
c_wrap
+
s
->
mb_x
-
1
;
#if 0
/* clean DC */
memsetw(s->dc_val[0] + l_xy, 1024, l_wrap
*2+
1);
memsetw(s->dc_val[1] + c_xy, 1024, c_wrap
+
1);
memsetw(s->dc_val[2] + c_xy, 1024, c_wrap
+
1);
memsetw(s->dc_val[0] + l_xy, 1024, l_wrap
* 2 +
1);
memsetw(s->dc_val[1] + c_xy, 1024, c_wrap
+
1);
memsetw(s->dc_val[2] + c_xy, 1024, c_wrap
+
1);
#endif
/* clean AC */
memset
(
s
->
ac_val
[
0
]
+
l_xy
,
0
,
(
l_wrap
*
2
+
1
)
*
16
*
sizeof
(
int16_t
));
memset
(
s
->
ac_val
[
1
]
+
c_xy
,
0
,
(
c_wrap
+
1
)
*
16
*
sizeof
(
int16_t
));
memset
(
s
->
ac_val
[
2
]
+
c_xy
,
0
,
(
c_wrap
+
1
)
*
16
*
sizeof
(
int16_t
));
memset
(
s
->
ac_val
[
0
]
+
l_xy
,
0
,
(
l_wrap
*
2
+
1
)
*
16
*
sizeof
(
int16_t
));
memset
(
s
->
ac_val
[
1
]
+
c_xy
,
0
,
(
c_wrap
+
1
)
*
16
*
sizeof
(
int16_t
));
memset
(
s
->
ac_val
[
2
]
+
c_xy
,
0
,
(
c_wrap
+
1
)
*
16
*
sizeof
(
int16_t
));
/* clean MV */
// we can't clear the MVs as they might be needed by a b frame
// memset(s->motion_val + l_xy, 0, (l_wrap*2+1)*2*sizeof(int16_t));
// memset(s->motion_val, 0, 2*sizeof(int16_t)*(2 + s->mb_width*2)*(2 + s->mb_height*2));
s
->
last_mv
[
0
][
0
][
0
]
=
s
->
last_mv
[
0
][
0
][
1
]
=
s
->
last_mv
[
1
][
0
][
0
]
=
s
->
last_mv
[
1
][
0
][
1
]
=
0
;
// memset(s->motion_val + l_xy, 0, (l_wrap * 2 + 1) * 2 * sizeof(int16_t));
// memset(s->motion_val, 0, 2 * sizeof(int16_t) * (2 + s->mb_width * 2) *
// (2 + s->mb_height * 2));
s
->
last_mv
[
0
][
0
][
0
]
=
s
->
last_mv
[
0
][
0
][
1
]
=
s
->
last_mv
[
1
][
0
][
0
]
=
s
->
last_mv
[
1
][
0
][
1
]
=
0
;
}
#define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
#define tab_bias (tab_size
/
2)
#define tab_bias (tab_size
/
2)
//used by mpeg4 and rv10 decoder
void
ff_mpeg4_init_direct_mv
(
MpegEncContext
*
s
){
// used by mpeg4 and rv10 decoder
void
ff_mpeg4_init_direct_mv
(
MpegEncContext
*
s
)
{
int
i
;
for
(
i
=
0
;
i
<
tab_size
;
i
++
){
s
->
direct_scale_mv
[
0
][
i
]
=
(
i
-
tab_bias
)
*
s
->
pb_time
/
s
->
pp_time
;
s
->
direct_scale_mv
[
1
][
i
]
=
(
i
-
tab_bias
)
*
(
s
->
pb_time
-
s
->
pp_time
)
/
s
->
pp_time
;
for
(
i
=
0
;
i
<
tab_size
;
i
++
)
{
s
->
direct_scale_mv
[
0
][
i
]
=
(
i
-
tab_bias
)
*
s
->
pb_time
/
s
->
pp_time
;
s
->
direct_scale_mv
[
1
][
i
]
=
(
i
-
tab_bias
)
*
(
s
->
pb_time
-
s
->
pp_time
)
/
s
->
pp_time
;
}
}
static
inline
void
ff_mpeg4_set_one_direct_mv
(
MpegEncContext
*
s
,
int
mx
,
int
my
,
int
i
){
int
xy
=
s
->
block_index
[
i
];
uint16_t
time_pp
=
s
->
pp_time
;
uint16_t
time_pb
=
s
->
pb_time
;
static
inline
void
ff_mpeg4_set_one_direct_mv
(
MpegEncContext
*
s
,
int
mx
,
int
my
,
int
i
)
{
int
xy
=
s
->
block_index
[
i
];
uint16_t
time_pp
=
s
->
pp_time
;
uint16_t
time_pb
=
s
->
pb_time
;
int
p_mx
,
p_my
;
p_mx
=
s
->
next_picture
.
motion_val
[
0
][
xy
][
0
];
if
((
unsigned
)(
p_mx
+
tab_bias
)
<
tab_size
)
{
if
((
unsigned
)(
p_mx
+
tab_bias
)
<
tab_size
)
{
s
->
mv
[
0
][
i
][
0
]
=
s
->
direct_scale_mv
[
0
][
p_mx
+
tab_bias
]
+
mx
;
s
->
mv
[
1
][
i
][
0
]
=
mx
?
s
->
mv
[
0
][
i
][
0
]
-
p_mx
:
s
->
direct_scale_mv
[
1
][
p_mx
+
tab_bias
];
}
else
{
s
->
mv
[
0
][
i
][
0
]
=
p_mx
*
time_pb
/
time_pp
+
mx
;
}
else
{
s
->
mv
[
0
][
i
][
0
]
=
p_mx
*
time_pb
/
time_pp
+
mx
;
s
->
mv
[
1
][
i
][
0
]
=
mx
?
s
->
mv
[
0
][
i
][
0
]
-
p_mx
:
p_mx
*
(
time_pb
-
time_pp
)
/
time_pp
;
:
p_mx
*
(
time_pb
-
time_pp
)
/
time_pp
;
}
p_my
=
s
->
next_picture
.
motion_val
[
0
][
xy
][
1
];
if
((
unsigned
)(
p_my
+
tab_bias
)
<
tab_size
)
{
if
((
unsigned
)(
p_my
+
tab_bias
)
<
tab_size
)
{
s
->
mv
[
0
][
i
][
1
]
=
s
->
direct_scale_mv
[
0
][
p_my
+
tab_bias
]
+
my
;
s
->
mv
[
1
][
i
][
1
]
=
my
?
s
->
mv
[
0
][
i
][
1
]
-
p_my
:
s
->
direct_scale_mv
[
1
][
p_my
+
tab_bias
];
}
else
{
s
->
mv
[
0
][
i
][
1
]
=
p_my
*
time_pb
/
time_pp
+
my
;
}
else
{
s
->
mv
[
0
][
i
][
1
]
=
p_my
*
time_pb
/
time_pp
+
my
;
s
->
mv
[
1
][
i
][
1
]
=
my
?
s
->
mv
[
0
][
i
][
1
]
-
p_my
:
p_my
*
(
time_pb
-
time_pp
)
/
time_pp
;
:
p_my
*
(
time_pb
-
time_pp
)
/
time_pp
;
}
}
...
...
@@ -115,56 +121,72 @@ static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx, int my,
#undef tab_bias
/**
*
* @return the mb_type
*/
int
ff_mpeg4_set_direct_mv
(
MpegEncContext
*
s
,
int
mx
,
int
my
){
const
int
mb_index
=
s
->
mb_x
+
s
->
mb_y
*
s
->
mb_stride
;
int
ff_mpeg4_set_direct_mv
(
MpegEncContext
*
s
,
int
mx
,
int
my
)
{
const
int
mb_index
=
s
->
mb_x
+
s
->
mb_y
*
s
->
mb_stride
;
const
int
colocated_mb_type
=
s
->
next_picture
.
mb_type
[
mb_index
];
uint16_t
time_pp
;
uint16_t
time_pb
;
int
i
;
//FIXME avoid divides
//
FIXME avoid divides
// try special case with shifts for 1 and 3 B-frames?
if
(
IS_8X8
(
colocated_mb_type
))
{
if
(
IS_8X8
(
colocated_mb_type
))
{
s
->
mv_type
=
MV_TYPE_8X8
;
for
(
i
=
0
;
i
<
4
;
i
++
){
for
(
i
=
0
;
i
<
4
;
i
++
)
ff_mpeg4_set_one_direct_mv
(
s
,
mx
,
my
,
i
);
}
return
MB_TYPE_DIRECT2
|
MB_TYPE_8x8
|
MB_TYPE_L0L1
;
}
else
if
(
IS_INTERLACED
(
colocated_mb_type
))
{
}
else
if
(
IS_INTERLACED
(
colocated_mb_type
))
{
s
->
mv_type
=
MV_TYPE_FIELD
;
for
(
i
=
0
;
i
<
2
;
i
++
)
{
for
(
i
=
0
;
i
<
2
;
i
++
)
{
int
field_select
=
s
->
next_picture
.
ref_index
[
0
][
4
*
mb_index
+
2
*
i
];
s
->
field_select
[
0
][
i
]
=
field_select
;
s
->
field_select
[
1
][
i
]
=
i
;
if
(
s
->
top_field_first
)
{
time_pp
=
s
->
pp_field_time
-
field_select
+
i
;
time_pb
=
s
->
pb_field_time
-
field_select
+
i
;
}
else
{
time_pp
=
s
->
pp_field_time
+
field_select
-
i
;
time_pb
=
s
->
pb_field_time
+
field_select
-
i
;
s
->
field_select
[
0
][
i
]
=
field_select
;
s
->
field_select
[
1
][
i
]
=
i
;
if
(
s
->
top_field_first
)
{
time_pp
=
s
->
pp_field_time
-
field_select
+
i
;
time_pb
=
s
->
pb_field_time
-
field_select
+
i
;
}
else
{
time_pp
=
s
->
pp_field_time
+
field_select
-
i
;
time_pb
=
s
->
pb_field_time
+
field_select
-
i
;
}
s
->
mv
[
0
][
i
][
0
]
=
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
0
]
*
time_pb
/
time_pp
+
mx
;
s
->
mv
[
0
][
i
][
1
]
=
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
1
]
*
time_pb
/
time_pp
+
my
;
s
->
mv
[
1
][
i
][
0
]
=
mx
?
s
->
mv
[
0
][
i
][
0
]
-
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
0
]
:
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
0
]
*
(
time_pb
-
time_pp
)
/
time_pp
;
s
->
mv
[
1
][
i
][
1
]
=
my
?
s
->
mv
[
0
][
i
][
1
]
-
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
1
]
:
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
1
]
*
(
time_pb
-
time_pp
)
/
time_pp
;
s
->
mv
[
0
][
i
][
0
]
=
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
0
]
*
time_pb
/
time_pp
+
mx
;
s
->
mv
[
0
][
i
][
1
]
=
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
1
]
*
time_pb
/
time_pp
+
my
;
s
->
mv
[
1
][
i
][
0
]
=
mx
?
s
->
mv
[
0
][
i
][
0
]
-
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
0
]
:
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
0
]
*
(
time_pb
-
time_pp
)
/
time_pp
;
s
->
mv
[
1
][
i
][
1
]
=
my
?
s
->
mv
[
0
][
i
][
1
]
-
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
1
]
:
s
->
p_field_mv_table
[
i
][
0
][
mb_index
][
1
]
*
(
time_pb
-
time_pp
)
/
time_pp
;
}
return
MB_TYPE_DIRECT2
|
MB_TYPE_16x8
|
MB_TYPE_L0L1
|
MB_TYPE_INTERLACED
;
}
else
{
return
MB_TYPE_DIRECT2
|
MB_TYPE_16x8
|
MB_TYPE_L0L1
|
MB_TYPE_INTERLACED
;
}
else
{
ff_mpeg4_set_one_direct_mv
(
s
,
mx
,
my
,
0
);
s
->
mv
[
0
][
1
][
0
]
=
s
->
mv
[
0
][
2
][
0
]
=
s
->
mv
[
0
][
3
][
0
]
=
s
->
mv
[
0
][
0
][
0
];
s
->
mv
[
0
][
1
][
1
]
=
s
->
mv
[
0
][
2
][
1
]
=
s
->
mv
[
0
][
3
][
1
]
=
s
->
mv
[
0
][
0
][
1
];
s
->
mv
[
1
][
1
][
0
]
=
s
->
mv
[
1
][
2
][
0
]
=
s
->
mv
[
1
][
3
][
0
]
=
s
->
mv
[
1
][
0
][
0
];
s
->
mv
[
1
][
1
][
1
]
=
s
->
mv
[
1
][
2
][
1
]
=
s
->
mv
[
1
][
3
][
1
]
=
s
->
mv
[
1
][
0
][
1
];
if
((
s
->
avctx
->
workaround_bugs
&
FF_BUG_DIRECT_BLOCKSIZE
)
||
!
s
->
quarter_sample
)
s
->
mv_type
=
MV_TYPE_16X16
;
s
->
mv
[
0
][
1
][
0
]
=
s
->
mv
[
0
][
2
][
0
]
=
s
->
mv
[
0
][
3
][
0
]
=
s
->
mv
[
0
][
0
][
0
];
s
->
mv
[
0
][
1
][
1
]
=
s
->
mv
[
0
][
2
][
1
]
=
s
->
mv
[
0
][
3
][
1
]
=
s
->
mv
[
0
][
0
][
1
];
s
->
mv
[
1
][
1
][
0
]
=
s
->
mv
[
1
][
2
][
0
]
=
s
->
mv
[
1
][
3
][
0
]
=
s
->
mv
[
1
][
0
][
0
];
s
->
mv
[
1
][
1
][
1
]
=
s
->
mv
[
1
][
2
][
1
]
=
s
->
mv
[
1
][
3
][
1
]
=
s
->
mv
[
1
][
0
][
1
];
if
((
s
->
avctx
->
workaround_bugs
&
FF_BUG_DIRECT_BLOCKSIZE
)
||
!
s
->
quarter_sample
)
s
->
mv_type
=
MV_TYPE_16X16
;
else
s
->
mv_type
=
MV_TYPE_8X8
;
return
MB_TYPE_DIRECT2
|
MB_TYPE_16x16
|
MB_TYPE_L0L1
;
//Note see prev line
s
->
mv_type
=
MV_TYPE_8X8
;
// Note see prev line
return
MB_TYPE_DIRECT2
|
MB_TYPE_16x16
|
MB_TYPE_L0L1
;
}
}
libavcodec/mpeg4video.h
浏览文件 @
dc6ea00c
...
...
@@ -24,6 +24,7 @@
#define AVCODEC_MPEG4VIDEO_H
#include <stdint.h>
#include "get_bits.h"
#include "mpegvideo.h"
#include "rl.h"
...
...
@@ -34,13 +35,13 @@
#define BIN_ONLY_SHAPE 2
#define GRAY_SHAPE 3
#define SIMPLE_VO_TYPE
1
#define CORE_VO_TYPE
3
#define MAIN_VO_TYPE
4
#define NBIT_VO_TYPE
5
#define ARTS_VO_TYPE
10
#define ACE_VO_TYPE
12
#define ADV_SIMPLE_VO_TYPE
17
#define SIMPLE_VO_TYPE 1
#define CORE_VO_TYPE 3
#define MAIN_VO_TYPE 4
#define NBIT_VO_TYPE 5
#define ARTS_VO_TYPE 10
#define ACE_VO_TYPE 12
#define ADV_SIMPLE_VO_TYPE 17
// aspect_ratio_info
#define EXTENDED_PAR 15
...
...
@@ -88,15 +89,15 @@ extern const uint8_t ff_mpeg4_dc_threshold[8];
void
ff_mpeg4_encode_mb
(
MpegEncContext
*
s
,
int16_t
block
[
6
][
64
],
int
motion_x
,
int
motion_y
);
void
ff_mpeg4_pred_ac
(
MpegEncContext
*
s
,
int16_t
*
block
,
int
n
,
void
ff_mpeg4_pred_ac
(
MpegEncContext
*
s
,
int16_t
*
block
,
int
n
,
int
dir
);
void
ff_set_mpeg4_time
(
MpegEncContext
*
s
);
void
ff_set_mpeg4_time
(
MpegEncContext
*
s
);
void
ff_mpeg4_encode_picture_header
(
MpegEncContext
*
s
,
int
picture_number
);
int
ff_mpeg4_decode_picture_header
(
MpegEncContext
*
s
,
GetBitContext
*
gb
);
int
ff_mpeg4_decode_picture_header
(
MpegEncContext
*
s
,
GetBitContext
*
gb
);
void
ff_mpeg4_encode_video_packet_header
(
MpegEncContext
*
s
);
void
ff_mpeg4_clean_buffers
(
MpegEncContext
*
s
);
void
ff_mpeg4_stuffing
(
PutBitContext
*
pbc
);
void
ff_mpeg4_stuffing
(
PutBitContext
*
pbc
);
void
ff_mpeg4_init_partitions
(
MpegEncContext
*
s
);
void
ff_mpeg4_merge_partitions
(
MpegEncContext
*
s
);
void
ff_clean_mpeg4_qscales
(
MpegEncContext
*
s
);
...
...
@@ -111,8 +112,7 @@ void ff_mpeg4_init_direct_mv(MpegEncContext *s);
*/
int
ff_mpeg4_set_direct_mv
(
MpegEncContext
*
s
,
int
mx
,
int
my
);
extern
uint8_t
ff_mpeg4_static_rl_table_store
[
3
][
2
][
2
*
MAX_RUN
+
MAX_LEVEL
+
3
];
extern
uint8_t
ff_mpeg4_static_rl_table_store
[
3
][
2
][
2
*
MAX_RUN
+
MAX_LEVEL
+
3
];
#if 0 //3IV1 is quite rare and it slows things down a tiny bit
#define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
...
...
@@ -120,7 +120,6 @@ extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
#define IS_3IV1 0
#endif
/**
* Predict the dc.
* encoding quantized level -> quantized diff
...
...
@@ -128,75 +127,81 @@ extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir_ptr pointer to an integer where the prediction direction will be stored
*/
static
inline
int
ff_mpeg4_pred_dc
(
MpegEncContext
*
s
,
int
n
,
int
level
,
int
*
dir_ptr
,
int
encoding
)
static
inline
int
ff_mpeg4_pred_dc
(
MpegEncContext
*
s
,
int
n
,
int
level
,
int
*
dir_ptr
,
int
encoding
)
{
int
a
,
b
,
c
,
wrap
,
pred
,
scale
,
ret
;
int16_t
*
dc_val
;
/* find prediction */
if
(
n
<
4
)
{
if
(
n
<
4
)
scale
=
s
->
y_dc_scale
;
}
else
{
else
scale
=
s
->
c_dc_scale
;
}
if
(
IS_3IV1
)
scale
=
8
;
if
(
IS_3IV1
)
scale
=
8
;
wrap
=
s
->
block_wrap
[
n
];
wrap
=
s
->
block_wrap
[
n
];
dc_val
=
s
->
dc_val
[
0
]
+
s
->
block_index
[
n
];
/* B C
* A X
*/
a
=
dc_val
[
-
1
];
b
=
dc_val
[
-
1
-
wrap
];
c
=
dc_val
[
-
wrap
];
/* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
if
(
s
->
first_slice_line
&&
n
!=
3
){
if
(
n
!=
2
)
b
=
c
=
1024
;
if
(
n
!=
1
&&
s
->
mb_x
==
s
->
resync_mb_x
)
b
=
a
=
1024
;
a
=
dc_val
[
-
1
];
b
=
dc_val
[
-
1
-
wrap
];
c
=
dc_val
[
-
wrap
];
/* outside slice handling (we can't do that by memset as we need the
* dc for error resilience) */
if
(
s
->
first_slice_line
&&
n
!=
3
)
{
if
(
n
!=
2
)
b
=
c
=
1024
;
if
(
n
!=
1
&&
s
->
mb_x
==
s
->
resync_mb_x
)
b
=
a
=
1024
;
}
if
(
s
->
mb_x
==
s
->
resync_mb_x
&&
s
->
mb_y
==
s
->
resync_mb_y
+
1
)
{
if
(
n
==
0
||
n
==
4
||
n
==
5
)
b
=
1024
;
if
(
s
->
mb_x
==
s
->
resync_mb_x
&&
s
->
mb_y
==
s
->
resync_mb_y
+
1
)
{
if
(
n
==
0
||
n
==
4
||
n
==
5
)
b
=
1024
;
}
if
(
abs
(
a
-
b
)
<
abs
(
b
-
c
))
{
pred
=
c
;
pred
=
c
;
*
dir_ptr
=
1
;
/* top */
}
else
{
pred
=
a
;
pred
=
a
;
*
dir_ptr
=
0
;
/* left */
}
/* we assume pred is positive */
pred
=
FASTDIV
((
pred
+
(
scale
>>
1
)),
scale
);
if
(
encoding
)
{
if
(
encoding
)
{
ret
=
level
-
pred
;
}
else
{
}
else
{
level
+=
pred
;
ret
=
level
;
if
(
s
->
err_recognition
&
AV_EF_BITSTREAM
){
if
(
level
<
0
){
av_log
(
s
->
avctx
,
AV_LOG_ERROR
,
"dc<0 at %dx%d
\n
"
,
s
->
mb_x
,
s
->
mb_y
);
ret
=
level
;
if
(
s
->
err_recognition
&
AV_EF_BITSTREAM
)
{
if
(
level
<
0
)
{
av_log
(
s
->
avctx
,
AV_LOG_ERROR
,
"dc<0 at %dx%d
\n
"
,
s
->
mb_x
,
s
->
mb_y
);
return
-
1
;
}
if
(
level
*
scale
>
2048
+
scale
){
av_log
(
s
->
avctx
,
AV_LOG_ERROR
,
"dc overflow at %dx%d
\n
"
,
s
->
mb_x
,
s
->
mb_y
);
if
(
level
*
scale
>
2048
+
scale
)
{
av_log
(
s
->
avctx
,
AV_LOG_ERROR
,
"dc overflow at %dx%d
\n
"
,
s
->
mb_x
,
s
->
mb_y
);
return
-
1
;
}
}
}
level
*=
scale
;
if
(
level
&
(
~
2047
))
{
if
(
level
<
0
)
level
=
0
;
else
if
(
!
(
s
->
workaround_bugs
&
FF_BUG_DC_CLIP
))
level
=
2047
;
level
*=
scale
;
if
(
level
&
(
~
2047
))
{
if
(
level
<
0
)
level
=
0
;
else
if
(
!
(
s
->
workaround_bugs
&
FF_BUG_DC_CLIP
))
level
=
2047
;
}
dc_val
[
0
]
=
level
;
dc_val
[
0
]
=
level
;
return
ret
;
}
#endif
/* AVCODEC_MPEG4VIDEO_H */
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