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Linshizhi
ffmpeg.wasm-core
Commits
80a16ccf
Commit
80a16ccf
authored
Sep 04, 2007
by
Mike Melanson
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simplify PTS handling
Originally committed as revision 10291 to
svn://svn.ffmpeg.org/ffmpeg/trunk
parent
f55f27ba
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1 changed file
with
10 additions
and
33 deletions
+10
-33
flic.c
libavformat/flic.c
+10
-33
No files found.
libavformat/flic.c
View file @
80a16ccf
...
...
@@ -39,16 +39,15 @@
originated in Dave's Targa Animator (DTA) */
#define FLIC_CHUNK_MAGIC_1 0xF1FA
#define FLIC_CHUNK_MAGIC_2 0xF5FA
#define FLIC_MC_
PTS_INC 6000
/* pts increment
for Magic Carpet game FLIs */
#define FLIC_DEFAULT_
PTS_INC 6000
/* for FLIs that have 0 speed */
#define FLIC_MC_
SPEED 5
/* speed
for Magic Carpet game FLIs */
#define FLIC_DEFAULT_
SPEED 5
/* for FLIs that have 0 speed */
#define FLIC_HEADER_SIZE 128
#define FLIC_PREAMBLE_SIZE 6
typedef
struct
FlicDemuxContext
{
int
frame_pts_inc
;
int64_t
pts
;
int
video_stream_index
;
int
frame_number
;
}
FlicDemuxContext
;
static
int
flic_probe
(
AVProbeData
*
p
)
...
...
@@ -74,7 +73,7 @@ static int flic_read_header(AVFormatContext *s,
int
speed
;
int
magic_number
;
flic
->
pts
=
0
;
flic
->
frame_number
=
0
;
/* load the whole header and pull out the width and height */
if
(
get_buffer
(
pb
,
header
,
FLIC_HEADER_SIZE
)
!=
FLIC_HEADER_SIZE
)
...
...
@@ -82,6 +81,8 @@ static int flic_read_header(AVFormatContext *s,
magic_number
=
AV_RL16
(
&
header
[
4
]);
speed
=
AV_RL32
(
&
header
[
0x10
]);
if
(
speed
==
0
)
speed
=
FLIC_DEFAULT_SPEED
;
/* initialize the decoder streams */
st
=
av_new_stream
(
s
,
0
);
...
...
@@ -108,14 +109,12 @@ static int flic_read_header(AVFormatContext *s,
st
->
codec
->
extradata
=
av_malloc
(
FLIC_HEADER_SIZE
);
memcpy
(
st
->
codec
->
extradata
,
header
,
FLIC_HEADER_SIZE
);
av_set_pts_info
(
st
,
33
,
1
,
90000
);
/* Time to figure out the framerate: If there is a FLIC chunk magic
* number at offset 0x10, assume this is from the Bullfrog game,
* Magic Carpet. */
if
(
AV_RL16
(
&
header
[
0x10
])
==
FLIC_CHUNK_MAGIC_1
)
{
flic
->
frame_pts_inc
=
FLIC_MC_PTS_INC
;
av_set_pts_info
(
st
,
64
,
FLIC_MC_SPEED
,
70
)
;
/* rewind the stream since the first chunk is at offset 12 */
url_fseek
(
pb
,
12
,
SEEK_SET
);
...
...
@@ -127,36 +126,15 @@ static int flic_read_header(AVFormatContext *s,
memcpy
(
st
->
codec
->
extradata
,
header
,
12
);
}
else
if
(
magic_number
==
FLIC_FILE_MAGIC_1
)
{
/*
* in this case, the speed (n) is number of 1/70s ticks between frames:
*
* pts n * frame #
* -------- = ----------- => pts = n * (90000/70) * frame #
* 90000 70
*
* therefore, the frame pts increment = n * 1285.7
*/
flic
->
frame_pts_inc
=
speed
*
1285
.
7
;
av_set_pts_info
(
st
,
64
,
speed
,
70
);
}
else
if
((
magic_number
==
FLIC_FILE_MAGIC_2
)
||
(
magic_number
==
FLIC_FILE_MAGIC_3
))
{
/*
* in this case, the speed (n) is number of milliseconds between frames:
*
* pts n * frame #
* -------- = ----------- => pts = n * 90 * frame #
* 90000 1000
*
* therefore, the frame pts increment = n * 90
*/
flic
->
frame_pts_inc
=
speed
*
90
;
av_set_pts_info
(
st
,
64
,
speed
,
1000
);
}
else
{
av_log
(
s
,
AV_LOG_INFO
,
"Invalid or unsupported magic chunk in file
\n
"
);
return
AVERROR_INVALIDDATA
;
}
if
(
flic
->
frame_pts_inc
==
0
)
flic
->
frame_pts_inc
=
FLIC_DEFAULT_PTS_INC
;
return
0
;
}
...
...
@@ -188,7 +166,7 @@ static int flic_read_packet(AVFormatContext *s,
break
;
}
pkt
->
stream_index
=
flic
->
video_stream_index
;
pkt
->
pts
=
flic
->
pts
;
pkt
->
pts
=
flic
->
frame_number
++
;
pkt
->
pos
=
url_ftell
(
pb
);
memcpy
(
pkt
->
data
,
preamble
,
FLIC_PREAMBLE_SIZE
);
ret
=
get_buffer
(
pb
,
pkt
->
data
+
FLIC_PREAMBLE_SIZE
,
...
...
@@ -197,7 +175,6 @@ static int flic_read_packet(AVFormatContext *s,
av_free_packet
(
pkt
);
ret
=
AVERROR
(
EIO
);
}
flic
->
pts
+=
flic
->
frame_pts_inc
;
packet_read
=
1
;
}
else
{
/* not interested in this chunk */
...
...
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