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d95ecd05
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d95ecd05
编写于
8月 13, 2001
作者:
F
Fabrice Bellard
浏览文件
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浏览文件
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电子邮件补丁
差异文件
better vol header parsing for mpeg4
Originally committed as revision 83 to
svn://svn.ffmpeg.org/ffmpeg/trunk
上级
3d03c0a2
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
88 addition
and
43 deletion
+88
-43
libavcodec/h263.c
libavcodec/h263.c
+88
-43
未找到文件。
libavcodec/h263.c
浏览文件 @
d95ecd05
...
...
@@ -18,9 +18,6 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "dsputil.h"
#include "avcodec.h"
...
...
@@ -28,9 +25,6 @@
#include "h263data.h"
#include "mpeg4data.h"
#define NDEBUG
#include <assert.h>
static
void
h263_encode_block
(
MpegEncContext
*
s
,
DCTELEM
*
block
,
int
n
);
static
void
h263_encode_motion
(
MpegEncContext
*
s
,
int
val
);
...
...
@@ -1166,43 +1160,66 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
}
if
(
startcode
==
0x120
)
{
int
time_increment_resolution
,
width
,
height
;
int
time_increment_resolution
,
width
,
height
,
vo_ver_id
;
/* vol header */
skip_bits
(
&
s
->
gb
,
1
);
/* random access */
skip_bits
(
&
s
->
gb
,
8
);
/* vo_type */
skip_bits
(
&
s
->
gb
,
1
);
/* is_ol_id */
skip_bits
(
&
s
->
gb
,
4
);
/* vo_ver_id */
skip_bits
(
&
s
->
gb
,
3
);
/* vo_priority */
if
(
get_bits1
(
&
s
->
gb
)
!=
0
)
{
/* is_ol_id */
vo_ver_id
=
get_bits
(
&
s
->
gb
,
4
);
/* vo_ver_id */
skip_bits
(
&
s
->
gb
,
3
);
/* vo_priority */
}
else
{
vo_ver_id
=
1
;
}
skip_bits
(
&
s
->
gb
,
4
);
/* aspect_ratio_info */
skip_bits
(
&
s
->
gb
,
1
);
/* vol control parameter */
s
kip
_bits
(
&
s
->
gb
,
2
);
/* vol shape */
skip_bits
1
(
&
s
->
gb
);
/* vol control parameter */
s
->
shape
=
get
_bits
(
&
s
->
gb
,
2
);
/* vol shape */
skip_bits1
(
&
s
->
gb
);
/* marker */
time_increment_resolution
=
get_bits
(
&
s
->
gb
,
16
);
s
->
time_increment_bits
=
log2
(
time_increment_resolution
-
1
)
+
1
;
if
(
s
->
time_increment_bits
<
1
)
s
->
time_increment_bits
=
1
;
skip_bits1
(
&
s
->
gb
);
/* marker */
skip_bits1
(
&
s
->
gb
);
/* vop rate */
skip_bits
(
&
s
->
gb
,
s
->
time_increment_bits
);
skip_bits1
(
&
s
->
gb
);
/* marker */
width
=
get_bits
(
&
s
->
gb
,
13
);
skip_bits1
(
&
s
->
gb
);
/* marker */
height
=
get_bits
(
&
s
->
gb
,
13
);
skip_bits1
(
&
s
->
gb
);
/* marker */
skip_bits1
(
&
s
->
gb
);
/* interfaced */
skip_bits1
(
&
s
->
gb
);
/* OBMC */
skip_bits
(
&
s
->
gb
,
2
);
/* vol_sprite_usage */
skip_bits1
(
&
s
->
gb
);
/* not_8_bit */
skip_bits1
(
&
s
->
gb
);
/* vol_quant_type */
skip_bits1
(
&
s
->
gb
);
/* vol_quarter_pixel */
skip_bits1
(
&
s
->
gb
);
/* complexity_estimation_disabled */
skip_bits1
(
&
s
->
gb
);
/* resync_marker_disabled */
skip_bits1
(
&
s
->
gb
);
/* data_partioning_enabled */
if
(
get_bits1
(
&
s
->
gb
)
!=
0
)
{
/* fixed_vop_rate */
skip_bits
(
&
s
->
gb
,
s
->
time_increment_bits
);
}
if
(
s
->
shape
!=
2
)
{
if
(
s
->
shape
==
0
)
{
skip_bits1
(
&
s
->
gb
);
/* marker */
width
=
get_bits
(
&
s
->
gb
,
13
);
skip_bits1
(
&
s
->
gb
);
/* marker */
height
=
get_bits
(
&
s
->
gb
,
13
);
skip_bits1
(
&
s
->
gb
);
/* marker */
}
skip_bits1
(
&
s
->
gb
);
/* interlaced */
skip_bits1
(
&
s
->
gb
);
/* OBMC */
if
(
vo_ver_id
==
1
)
{
s
->
vol_sprite_usage
=
get_bits1
(
&
s
->
gb
);
/* vol_sprite_usage */
}
else
{
s
->
vol_sprite_usage
=
get_bits
(
&
s
->
gb
,
2
);
/* vol_sprite_usage */
}
if
(
get_bits1
(
&
s
->
gb
)
==
1
)
{
/* not_8_bit */
s
->
quant_precision
=
get_bits
(
&
s
->
gb
,
4
);
/* quant_precision */
skip_bits
(
&
s
->
gb
,
4
);
/* bits_per_pixel */
}
else
{
s
->
quant_precision
=
5
;
}
skip_bits1
(
&
s
->
gb
);
/* vol_quant_type */
skip_bits1
(
&
s
->
gb
);
/* vol_quarter_pixel */
skip_bits1
(
&
s
->
gb
);
/* complexity_estimation_disabled */
skip_bits1
(
&
s
->
gb
);
/* resync_marker_disabled */
skip_bits1
(
&
s
->
gb
);
/* data_partioning_enabled */
if
(
get_bits1
(
&
s
->
gb
)
!=
0
)
{
/* scalability */
printf
(
"bad scalability!!!
\n
"
);
return
-
1
;
}
}
goto
redo
;
}
else
if
(
startcode
!=
0x1b6
)
{
goto
redo
;
...
...
@@ -1223,22 +1240,50 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
skip_bits1
(
&
s
->
gb
);
/* marker */
/* vop coded */
if
(
get_bits1
(
&
s
->
gb
)
!=
1
)
return
-
1
;
goto
redo
;
if
(
s
->
pict_type
==
P_TYPE
)
{
if
(
s
->
shape
!=
2
&&
s
->
pict_type
==
P_TYPE
)
{
/* rounding type for motion estimation */
s
->
no_rounding
=
get_bits1
(
&
s
->
gb
);
}
else
{
s
->
no_rounding
=
0
;
}
if
(
get_bits
(
&
s
->
gb
,
3
)
!=
0
)
return
-
1
;
/* intra dc VLC threshold */
s
->
qscale
=
get_bits
(
&
s
->
gb
,
5
);
if
(
s
->
pict_type
!=
I_TYPE
)
{
s
->
f_code
=
get_bits
(
&
s
->
gb
,
3
);
/* fcode_for */
}
return
0
;
if
(
s
->
shape
!=
0
)
{
if
(
s
->
vol_sprite_usage
!=
1
||
s
->
pict_type
!=
I_TYPE
)
{
int
width
,
height
,
hor_spat_ref
,
ver_spat_ref
;
width
=
get_bits
(
&
s
->
gb
,
13
);
skip_bits1
(
&
s
->
gb
);
/* marker */
height
=
get_bits
(
&
s
->
gb
,
13
);
skip_bits1
(
&
s
->
gb
);
/* marker */
hor_spat_ref
=
get_bits
(
&
s
->
gb
,
13
);
/* hor_spat_ref */
skip_bits1
(
&
s
->
gb
);
/* marker */
ver_spat_ref
=
get_bits
(
&
s
->
gb
,
13
);
/* ver_spat_ref */
}
skip_bits1
(
&
s
->
gb
);
/* change_CR_disable */
if
(
get_bits1
(
&
s
->
gb
)
!=
0
)
{
skip_bits
(
&
s
->
gb
,
8
);
/* constant_alpha_value */
}
}
if
(
s
->
shape
!=
2
)
{
skip_bits
(
&
s
->
gb
,
3
);
/* intra dc VLC threshold */
/* note: we do not use quant_precision to avoid problem if no
MPEG4 vol header as it is found on some old opendivx
movies */
s
->
qscale
=
get_bits
(
&
s
->
gb
,
5
);
if
(
s
->
pict_type
!=
I_TYPE
)
{
s
->
f_code
=
get_bits
(
&
s
->
gb
,
3
);
/* fcode_for */
}
if
(
s
->
shape
&&
(
s
->
pict_type
!=
I_TYPE
))
{
skip_bits1
(
&
s
->
gb
);
// vop shape coding type
}
}
return
0
;
}
/* don't understand why they choose a different header ! */
...
...
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