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Linshizhi
ffmpeg.wasm-core
Commits
3a6ccf4f
Commit
3a6ccf4f
authored
Sep 29, 2006
by
Baptiste Coudurier
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rudimentary binary seek
Originally committed as revision 6382 to
svn://svn.ffmpeg.org/ffmpeg/trunk
parent
1159f634
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30 additions
and
1 deletion
+30
-1
mxf.c
libavformat/mxf.c
+30
-1
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libavformat/mxf.c
View file @
3a6ccf4f
...
...
@@ -976,6 +976,35 @@ static int mxf_probe(AVProbeData *p) {
return
0
;
}
/* rudimentary binary seek */
/* XXX: use MXF Index */
static
int
mxf_read_seek
(
AVFormatContext
*
s
,
int
stream_index
,
int64_t
sample_time
,
int
flags
)
{
AVStream
*
st
=
s
->
streams
[
stream_index
];
offset_t
pos
=
url_ftell
(
&
s
->
pb
);
int64_t
seconds
;
int
i
;
if
(
!
s
->
bit_rate
||
sample_time
<
0
)
return
-
1
;
seconds
=
av_rescale
(
sample_time
,
st
->
time_base
.
num
,
st
->
time_base
.
den
);
url_fseek
(
&
s
->
pb
,
(
s
->
bit_rate
*
seconds
)
>>
3
,
SEEK_SET
);
/* sync on KLV essence element */
for
(
i
=
0
;
i
<
12
&&
url_ftell
(
&
s
->
pb
)
<
s
->
file_size
;
i
++
)
{
int
b
=
get_byte
(
&
s
->
pb
);
if
(
b
==
mxf_essence_element_key
[
0
])
i
=
0
;
else
if
(
b
!=
mxf_essence_element_key
[
i
])
i
=
-
1
;
}
if
(
i
==
12
)
{
/* found KLV key */
url_fseek
(
&
s
->
pb
,
-
12
,
SEEK_CUR
);
av_update_cur_dts
(
s
,
st
,
sample_time
);
return
0
;
}
url_fseek
(
&
s
->
pb
,
pos
,
SEEK_SET
);
return
-
1
;
}
AVInputFormat
mxf_demuxer
=
{
"mxf"
,
...
...
@@ -985,5 +1014,5 @@ AVInputFormat mxf_demuxer = {
mxf_read_header
,
mxf_read_packet
,
mxf_read_close
,
NULL
,
mxf_read_seek
,
};
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