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Linshizhi
ffmpeg.wasm-core
Commits
0c019473
Commit
0c019473
authored
Jan 03, 2012
by
Clément Bœsch
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lavfi: add audio silencedetect filter.
parent
5ccdb907
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6 changed files
with
210 additions
and
2 deletions
+210
-2
Changelog
Changelog
+1
-0
filters.texi
doc/filters.texi
+30
-0
Makefile
libavfilter/Makefile
+1
-0
af_silencedetect.c
libavfilter/af_silencedetect.c
+175
-0
allfilters.c
libavfilter/allfilters.c
+1
-0
avfilter.h
libavfilter/avfilter.h
+2
-2
No files found.
Changelog
View file @
0c019473
...
@@ -20,6 +20,7 @@ version next:
...
@@ -20,6 +20,7 @@ version next:
- v308 Quicktime Uncompressed 4:4:4 encoder and decoder
- v308 Quicktime Uncompressed 4:4:4 encoder and decoder
- yuv4 libquicktime packed 4:2:0 encoder and decoder
- yuv4 libquicktime packed 4:2:0 encoder and decoder
- ffprobe -show_frames option
- ffprobe -show_frames option
- silencedetect audio filter
version 0.9:
version 0.9:
...
...
doc/filters.texi
View file @
0c019473
...
@@ -358,6 +358,36 @@ Note that @command{ffmpeg} integrates a default down-mix (and up-mix) system
...
@@ -358,6 +358,36 @@ Note that @command{ffmpeg} integrates a default down-mix (and up-mix) system
that should be preferred (see "-ac" option) unless you have very specific
that should be preferred (see "-ac" option) unless you have very specific
needs.
needs.
@section silencedetect
Detect silence in an audio stream.
This filter logs a message when it detects that the input audio volume is less
or equal to a noise tolerance value for a duration greater or equal to the
minimum detected noise duration.
The printed times and duration are expressed in seconds.
@table @option
@item duration, d
Set silence duration until notification (default is 2 seconds).
@item noise, n
Set noise tolerance. Can be specified in dB (in case "dB" is appended to the
specified value) or amplitude ratio. Default is -60dB, or 0.001.
@end table
Detect 5 seconds of silence with -50dB noise tolerance:
@example
silencedetect=n=-50dB:d=5
@end example
Complete example with @command{ffmpeg} to detect silence with 0.0001 noise
tolerance in @file{silence.mp3}:
@example
ffmpeg -f lavfi -i amovie=silence.mp3,silencedetect=noise=0.0001 -f null -
@end example
@section volume
@section volume
Adjust the input audio volume.
Adjust the input audio volume.
...
...
libavfilter/Makefile
View file @
0c019473
...
@@ -34,6 +34,7 @@ OBJS-$(CONFIG_ASPLIT_FILTER) += af_asplit.o
...
@@ -34,6 +34,7 @@ OBJS-$(CONFIG_ASPLIT_FILTER) += af_asplit.o
OBJS-$(CONFIG_ASTREAMSYNC_FILTER)
+=
af_astreamsync.o
OBJS-$(CONFIG_ASTREAMSYNC_FILTER)
+=
af_astreamsync.o
OBJS-$(CONFIG_EARWAX_FILTER)
+=
af_earwax.o
OBJS-$(CONFIG_EARWAX_FILTER)
+=
af_earwax.o
OBJS-$(CONFIG_PAN_FILTER)
+=
af_pan.o
OBJS-$(CONFIG_PAN_FILTER)
+=
af_pan.o
OBJS-$(CONFIG_SILENCEDETECT_FILTER)
+=
af_silencedetect.o
OBJS-$(CONFIG_VOLUME_FILTER)
+=
af_volume.o
OBJS-$(CONFIG_VOLUME_FILTER)
+=
af_volume.o
OBJS-$(CONFIG_ABUFFER_FILTER)
+=
asrc_abuffer.o
OBJS-$(CONFIG_ABUFFER_FILTER)
+=
asrc_abuffer.o
...
...
libavfilter/af_silencedetect.c
0 → 100644
View file @
0c019473
/*
* Copyright (c) 2012 Clément Bœsch <ubitux@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Audio silence detector
*/
#include "libavutil/opt.h"
#include "avfilter.h"
typedef
struct
{
const
AVClass
*
class
;
char
*
noise_str
;
///< noise option string
double
noise
;
///< noise amplitude ratio
int
duration
;
///< minimum duration of silence until notification
int64_t
nb_null_samples
;
///< current number of continuous zero samples
double
start
;
///< if silence is detected, this value contains the time of the first zero sample
int
last_sample_rate
;
///< last sample rate to check for sample rate changes
}
SilenceDetectContext
;
#define OFFSET(x) offsetof(SilenceDetectContext, x)
static
const
AVOption
silencedetect_options
[]
=
{
{
"n"
,
"set noise tolerance"
,
OFFSET
(
noise_str
),
AV_OPT_TYPE_STRING
,
{.
str
=
"-60dB"
},
CHAR_MIN
,
CHAR_MAX
},
{
"noise"
,
"set noise tolerance"
,
OFFSET
(
noise_str
),
AV_OPT_TYPE_STRING
,
{.
str
=
"-60dB"
},
CHAR_MIN
,
CHAR_MAX
},
{
"d"
,
"set minimum duration in seconds"
,
OFFSET
(
duration
),
AV_OPT_TYPE_INT
,
{.
dbl
=
2
},
0
,
INT_MAX
},
{
"duration"
,
"set minimum duration in seconds"
,
OFFSET
(
duration
),
AV_OPT_TYPE_INT
,
{.
dbl
=
2
},
0
,
INT_MAX
},
{
NULL
},
};
static
const
char
*
silencedetect_get_name
(
void
*
ctx
)
{
return
"silencedetect"
;
}
static
const
AVClass
silencedetect_class
=
{
.
class_name
=
"SilenceDetectContext"
,
.
item_name
=
silencedetect_get_name
,
.
option
=
silencedetect_options
,
};
static
av_cold
int
init
(
AVFilterContext
*
ctx
,
const
char
*
args
,
void
*
opaque
)
{
int
ret
;
char
*
tail
;
SilenceDetectContext
*
silence
=
ctx
->
priv
;
silence
->
class
=
&
silencedetect_class
;
av_opt_set_defaults
(
silence
);
if
((
ret
=
av_set_options_string
(
silence
,
args
,
"="
,
":"
))
<
0
)
{
av_log
(
ctx
,
AV_LOG_ERROR
,
"Error parsing options string: '%s'
\n
"
,
args
);
return
ret
;
}
silence
->
noise
=
strtod
(
silence
->
noise_str
,
&
tail
);
if
(
!
strcmp
(
tail
,
"dB"
))
{
silence
->
noise
=
pow
(
10
,
silence
->
noise
/
20
);
}
else
if
(
*
tail
)
{
av_log
(
ctx
,
AV_LOG_ERROR
,
"Invalid value '%s' for noise parameter.
\n
"
,
silence
->
noise_str
);
return
AVERROR
(
EINVAL
);
}
return
0
;
}
static
void
filter_samples
(
AVFilterLink
*
inlink
,
AVFilterBufferRef
*
insamples
)
{
int
i
;
SilenceDetectContext
*
silence
=
inlink
->
dst
->
priv
;
const
int
nb_channels
=
av_get_channel_layout_nb_channels
(
inlink
->
channel_layout
);
const
int
srate
=
inlink
->
sample_rate
;
const
int
nb_samples
=
insamples
->
audio
->
nb_samples
*
nb_channels
;
const
int64_t
nb_samples_notify
=
srate
*
silence
->
duration
*
nb_channels
;
// scale number of null samples to the new sample rate
if
(
silence
->
last_sample_rate
&&
silence
->
last_sample_rate
!=
srate
)
silence
->
nb_null_samples
=
srate
*
silence
->
nb_null_samples
/
silence
->
last_sample_rate
;
silence
->
last_sample_rate
=
srate
;
// TODO: support more sample formats
if
(
insamples
->
format
==
AV_SAMPLE_FMT_DBL
)
{
double
*
p
=
(
double
*
)
insamples
->
data
[
0
];
for
(
i
=
0
;
i
<
nb_samples
;
i
++
,
p
++
)
{
if
(
*
p
<
silence
->
noise
&&
*
p
>
-
silence
->
noise
)
{
if
(
!
silence
->
start
)
{
silence
->
nb_null_samples
++
;
if
(
silence
->
nb_null_samples
>=
nb_samples_notify
)
{
silence
->
start
=
insamples
->
pts
*
av_q2d
(
inlink
->
time_base
)
-
silence
->
duration
;
av_log
(
silence
,
AV_LOG_INFO
,
"silence_start: %f
\n
"
,
silence
->
start
);
}
}
}
else
{
if
(
silence
->
start
)
{
double
end
=
insamples
->
pts
*
av_q2d
(
inlink
->
time_base
);
av_log
(
silence
,
AV_LOG_INFO
,
"silence_end: %f | silence_duration: %f
\n
"
,
end
,
end
-
silence
->
start
);
}
silence
->
nb_null_samples
=
silence
->
start
=
0
;
}
}
}
avfilter_filter_samples
(
inlink
->
dst
->
outputs
[
0
],
insamples
);
}
static
int
query_formats
(
AVFilterContext
*
ctx
)
{
AVFilterFormats
*
formats
=
NULL
;
enum
AVSampleFormat
sample_fmts
[]
=
{
AV_SAMPLE_FMT_DBL
,
AV_SAMPLE_FMT_NONE
};
int
packing_fmts
[]
=
{
AVFILTER_PACKED
,
-
1
};
formats
=
avfilter_make_all_channel_layouts
();
if
(
!
formats
)
return
AVERROR
(
ENOMEM
);
avfilter_set_common_channel_layouts
(
ctx
,
formats
);
formats
=
avfilter_make_format_list
(
sample_fmts
);
if
(
!
formats
)
return
AVERROR
(
ENOMEM
);
avfilter_set_common_sample_formats
(
ctx
,
formats
);
formats
=
avfilter_make_format_list
(
packing_fmts
);
if
(
!
formats
)
return
AVERROR
(
ENOMEM
);
avfilter_set_common_packing_formats
(
ctx
,
formats
);
return
0
;
}
AVFilter
avfilter_af_silencedetect
=
{
.
name
=
"silencedetect"
,
.
description
=
NULL_IF_CONFIG_SMALL
(
"Detect silence."
),
.
priv_size
=
sizeof
(
SilenceDetectContext
),
.
init
=
init
,
.
query_formats
=
query_formats
,
.
inputs
=
(
const
AVFilterPad
[])
{
{
.
name
=
"default"
,
.
type
=
AVMEDIA_TYPE_AUDIO
,
.
get_audio_buffer
=
avfilter_null_get_audio_buffer
,
.
filter_samples
=
filter_samples
,
},
{
.
name
=
NULL
}
},
.
outputs
=
(
const
AVFilterPad
[])
{
{
.
name
=
"default"
,
.
type
=
AVMEDIA_TYPE_AUDIO
,
},
{
.
name
=
NULL
}
},
};
libavfilter/allfilters.c
View file @
0c019473
...
@@ -44,6 +44,7 @@ void avfilter_register_all(void)
...
@@ -44,6 +44,7 @@ void avfilter_register_all(void)
REGISTER_FILTER
(
ASTREAMSYNC
,
astreamsync
,
af
);
REGISTER_FILTER
(
ASTREAMSYNC
,
astreamsync
,
af
);
REGISTER_FILTER
(
EARWAX
,
earwax
,
af
);
REGISTER_FILTER
(
EARWAX
,
earwax
,
af
);
REGISTER_FILTER
(
PAN
,
pan
,
af
);
REGISTER_FILTER
(
PAN
,
pan
,
af
);
REGISTER_FILTER
(
SILENCEDETECT
,
silencedetect
,
af
);
REGISTER_FILTER
(
VOLUME
,
volume
,
af
);
REGISTER_FILTER
(
VOLUME
,
volume
,
af
);
REGISTER_FILTER
(
ABUFFER
,
abuffer
,
asrc
);
REGISTER_FILTER
(
ABUFFER
,
abuffer
,
asrc
);
...
...
libavfilter/avfilter.h
View file @
0c019473
...
@@ -30,8 +30,8 @@
...
@@ -30,8 +30,8 @@
#include "libavcodec/avcodec.h"
#include "libavcodec/avcodec.h"
#define LIBAVFILTER_VERSION_MAJOR 2
#define LIBAVFILTER_VERSION_MAJOR 2
#define LIBAVFILTER_VERSION_MINOR 5
7
#define LIBAVFILTER_VERSION_MINOR 5
8
#define LIBAVFILTER_VERSION_MICRO 10
1
#define LIBAVFILTER_VERSION_MICRO 10
0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \
LIBAVFILTER_VERSION_MINOR, \
...
...
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