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Linshizhi
ffmpeg.wasm-core
Commits
f66d0c57
Commit
f66d0c57
authored
Apr 26, 2014
by
Luca Barbato
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latm: Add a probe function
parent
de69aedf
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rawdec.c
libavformat/rawdec.c
+53
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libavformat/rawdec.c
View file @
f66d0c57
...
@@ -27,6 +27,7 @@
...
@@ -27,6 +27,7 @@
#include "libavutil/opt.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixdesc.h"
#include "libavutil/intreadwrite.h"
#define RAW_PACKET_SIZE 1024
#define RAW_PACKET_SIZE 1024
...
@@ -109,9 +110,61 @@ const AVOption ff_rawvideo_options[] = {
...
@@ -109,9 +110,61 @@ const AVOption ff_rawvideo_options[] = {
};
};
#if CONFIG_LATM_DEMUXER
#if CONFIG_LATM_DEMUXER
#define LOAS_SYNC_WORD 0x2b7
static
int
latm_read_probe
(
AVProbeData
*
p
)
{
int
max_frames
=
0
,
first_frames
=
0
;
int
fsize
,
frames
;
uint8_t
*
buf0
=
p
->
buf
;
uint8_t
*
buf2
;
uint8_t
*
buf
;
uint8_t
*
end
=
buf0
+
p
->
buf_size
-
3
;
buf
=
buf0
;
for
(;
buf
<
end
;
buf
=
buf2
+
1
)
{
buf2
=
buf
;
for
(
frames
=
0
;
buf2
<
end
;
frames
++
)
{
uint32_t
header
=
AV_RB24
(
buf2
);
if
((
header
>>
13
)
!=
LOAS_SYNC_WORD
)
{
if
(
buf
!=
buf0
)
{
// Found something that isn't a LOAS header, starting
// from a position other than the start of the buffer.
// Discard the count we've accumulated so far since it
// probably was a false positive.
frames
=
0
;
}
break
;
}
fsize
=
(
header
&
0x1FFF
)
+
3
;
if
(
fsize
<
7
)
break
;
buf2
+=
fsize
;
}
max_frames
=
FFMAX
(
max_frames
,
frames
);
if
(
buf
==
buf0
)
first_frames
=
frames
;
}
if
(
first_frames
>=
3
)
return
AVPROBE_SCORE_EXTENSION
+
1
;
else
if
(
max_frames
>
100
)
return
AVPROBE_SCORE_EXTENSION
;
else
if
(
max_frames
>=
3
)
return
AVPROBE_SCORE_EXTENSION
/
2
;
else
if
(
max_frames
>=
1
)
return
1
;
else
return
0
;
}
AVInputFormat
ff_latm_demuxer
=
{
AVInputFormat
ff_latm_demuxer
=
{
.
name
=
"latm"
,
.
name
=
"latm"
,
.
long_name
=
NULL_IF_CONFIG_SMALL
(
"raw LOAS/LATM"
),
.
long_name
=
NULL_IF_CONFIG_SMALL
(
"raw LOAS/LATM"
),
.
read_probe
=
latm_read_probe
,
.
read_header
=
ff_raw_audio_read_header
,
.
read_header
=
ff_raw_audio_read_header
,
.
read_packet
=
ff_raw_read_partial_packet
,
.
read_packet
=
ff_raw_read_partial_packet
,
.
flags
=
AVFMT_GENERIC_INDEX
,
.
flags
=
AVFMT_GENERIC_INDEX
,
...
...
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