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Stefan Westerfeld
ffmpeg
Commits
6cfa1733
Commit
6cfa1733
authored
Feb 08, 2019
by
Mathieu Duponchelle
Committed by
Michael Niedermayer
Mar 15, 2019
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mpeg12enc: Use Closed Captions if available
Signed-off-by:
Michael Niedermayer
<
michael@niedermayer.cc
>
parent
def18ac4
Changes
3
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3 changed files
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37 additions
and
0 deletions
+37
-0
encoders.texi
doc/encoders.texi
+3
-0
mpeg12enc.c
libavcodec/mpeg12enc.c
+32
-0
mpegvideo.h
libavcodec/mpegvideo.h
+2
-0
No files found.
doc/encoders.texi
View file @
6cfa1733
...
...
@@ -2574,6 +2574,9 @@ Specifies the video_format written into the sequence display extension
indicating the source of the video pictures. The default is @samp{unspecified},
can be @samp{component}, @samp{pal}, @samp{ntsc}, @samp{secam} or @samp{mac}.
For maximum compatibility, use @samp{component}.
@item a53cc @var{boolean}
Import closed captions (which must be ATSC compatible format) into output.
Default is 1 (on).
@end table
@section png
...
...
libavcodec/mpeg12enc.c
View file @
6cfa1733
...
...
@@ -61,6 +61,8 @@ static uint32_t mpeg1_chr_dc_uni[512];
static
uint8_t
mpeg1_index_run
[
2
][
64
];
static
int8_t
mpeg1_max_level
[
2
][
64
];
#define A53_MAX_CC_COUNT 0x1f
static
av_cold
void
init_uni_ac_vlc
(
RLTable
*
rl
,
uint8_t
*
uni_ac_vlc_len
)
{
int
i
;
...
...
@@ -544,6 +546,36 @@ void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
}
}
if
(
s
->
codec_id
==
AV_CODEC_ID_MPEG2VIDEO
&&
s
->
a53_cc
)
{
side_data
=
av_frame_get_side_data
(
s
->
current_picture_ptr
->
f
,
AV_FRAME_DATA_A53_CC
);
if
(
side_data
)
{
if
(
side_data
->
size
<=
A53_MAX_CC_COUNT
*
3
&&
side_data
->
size
%
3
==
0
)
{
int
i
=
0
;
put_header
(
s
,
USER_START_CODE
);
put_bits
(
&
s
->
pb
,
8
,
'G'
);
// user_identifier
put_bits
(
&
s
->
pb
,
8
,
'A'
);
put_bits
(
&
s
->
pb
,
8
,
'9'
);
put_bits
(
&
s
->
pb
,
8
,
'4'
);
put_bits
(
&
s
->
pb
,
8
,
3
);
// user_data_type_code
put_bits
(
&
s
->
pb
,
8
,
(
side_data
->
size
/
3
&
A53_MAX_CC_COUNT
)
|
0x40
);
// flags, cc_count
put_bits
(
&
s
->
pb
,
8
,
0xff
);
// em_data
for
(
i
=
0
;
i
<
side_data
->
size
;
i
++
)
put_bits
(
&
s
->
pb
,
8
,
side_data
->
data
[
i
]);
put_bits
(
&
s
->
pb
,
8
,
0xff
);
// marker_bits
}
else
{
av_log
(
s
->
avctx
,
AV_LOG_WARNING
,
"Warning Closed Caption size (%d) can not exceed 93 bytes "
"and must be a multiple of 3
\n
"
,
side_data
->
size
);
}
}
}
s
->
mb_y
=
0
;
ff_mpeg1_encode_slice_header
(
s
);
}
...
...
libavcodec/mpegvideo.h
View file @
6cfa1733
...
...
@@ -455,6 +455,7 @@ typedef struct MpegEncContext {
/* MPEG-2-specific - I wished not to have to support this mess. */
int
progressive_sequence
;
int
mpeg_f_code
[
2
][
2
];
int
a53_cc
;
// picture structure defines are loaded from mpegutils.h
int
picture_structure
;
...
...
@@ -663,6 +664,7 @@ FF_MPV_OPT_CMP_FUNC, \
{"ps", "RTP payload size in bytes", FF_MPV_OFFSET(rtp_payload_size), AV_OPT_TYPE_INT, {.i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS }, \
{"mepc", "Motion estimation bitrate penalty compensation (1.0 = 256)", FF_MPV_OFFSET(me_penalty_compensation), AV_OPT_TYPE_INT, {.i64 = 256 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS }, \
{"mepre", "pre motion estimation", FF_MPV_OFFSET(me_pre), AV_OPT_TYPE_INT, {.i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS }, \
{"a53cc", "Use A53 Closed Captions (if available)", FF_MPV_OFFSET(a53_cc), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FF_MPV_OPT_FLAGS }, \
extern
const
AVOption
ff_mpv_generic_options
[];
...
...
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