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Linshizhi
ffmpeg.wasm-core
Commits
0c3a3b75
Commit
0c3a3b75
authored
Aug 25, 2012
by
Michael Niedermayer
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ac3_probe: fix probing of non standard AC3
Signed-off-by:
Michael Niedermayer
<
michaelni@gmx.at
>
parent
4b9e4486
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1 changed file
with
22 additions
and
4 deletions
+22
-4
ac3dec.c
libavformat/ac3dec.c
+22
-4
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libavformat/ac3dec.c
View file @
0c3a3b75
...
...
@@ -37,18 +37,36 @@ static int ac3_eac3_probe(AVProbeData *p, enum AVCodecID expected_codec_id)
end
=
buf
+
p
->
buf_size
;
for
(;
buf
<
end
;
buf
++
)
{
if
(
buf
>
p
->
buf
&&
(
buf
[
0
]
!=
0x0B
||
buf
[
1
]
!=
0x77
)
)
if
(
buf
>
p
->
buf
&&
!
(
buf
[
0
]
==
0x0B
&&
buf
[
1
]
==
0x77
)
&&
!
(
buf
[
0
]
==
0x77
&&
buf
[
1
]
==
0x0B
)
)
continue
;
buf2
=
buf
;
for
(
frames
=
0
;
buf2
<
end
;
frames
++
)
{
uint8_t
buf3
[
4096
];
int
i
;
if
(
!
memcmp
(
buf2
,
"\x1
\x10\0\0\0\0\0\0
"
,
8
))
buf2
+=
16
;
init_get_bits
(
&
gbc
,
buf2
,
54
);
if
(
buf
[
0
]
==
0x77
&&
buf
[
1
]
==
0x0B
)
{
for
(
i
=
0
;
i
<
8
;
i
+=
2
)
{
buf3
[
i
]
=
buf
[
i
+
1
];
buf3
[
i
+
1
]
=
buf
[
i
];
}
init_get_bits
(
&
gbc
,
buf3
,
54
);
}
else
init_get_bits
(
&
gbc
,
buf2
,
54
);
if
(
avpriv_ac3_parse_header
(
&
gbc
,
&
hdr
)
<
0
)
break
;
if
(
buf2
+
hdr
.
frame_size
>
end
||
av_crc
(
av_crc_get_table
(
AV_CRC_16_ANSI
),
0
,
buf2
+
2
,
hdr
.
frame_size
-
2
))
if
(
buf2
+
hdr
.
frame_size
>
end
)
break
;
if
(
buf
[
0
]
==
0x77
&&
buf
[
1
]
==
0x0B
)
{
av_assert0
(
hdr
.
frame_size
<=
sizeof
(
buf3
));
for
(;
i
<
hdr
.
frame_size
;
i
+=
2
)
{
buf3
[
i
]
=
buf
[
i
+
1
];
buf3
[
i
+
1
]
=
buf
[
i
];
}
}
if
(
av_crc
(
av_crc_get_table
(
AV_CRC_16_ANSI
),
0
,
gbc
.
buffer
+
2
,
hdr
.
frame_size
-
2
))
break
;
if
(
hdr
.
bitstream_id
>
10
)
codec_id
=
AV_CODEC_ID_EAC3
;
...
...
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