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体验新版 GitCode,发现更多精彩内容 >>
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a9509ad3
编写于
9月 21, 2015
作者:
K
Kyle Swanson
提交者:
Paul B Mahol
9月 22, 2015
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差异文件
avfilter: add tremolo filter
Signed-off-by:
N
Kyle Swanson
<
k@ylo.ph
>
上级
d9c72e0d
变更
6
显示空白变更内容
内联
并排
Showing
6 changed file
with
196 addition
and
1 deletion
+196
-1
Changelog
Changelog
+1
-0
doc/filters.texi
doc/filters.texi
+19
-0
libavfilter/Makefile
libavfilter/Makefile
+1
-0
libavfilter/af_tremolo.c
libavfilter/af_tremolo.c
+173
-0
libavfilter/allfilters.c
libavfilter/allfilters.c
+1
-0
libavfilter/version.h
libavfilter/version.h
+1
-1
未找到文件。
Changelog
浏览文件 @
a9509ad3
...
...
@@ -9,6 +9,7 @@ version <next>:
- stereowiden filter
- stereotools filter
- rubberband filter
- tremolo filter
version 2.8:
...
...
doc/filters.texi
浏览文件 @
a9509ad3
...
...
@@ -2568,6 +2568,25 @@ slope
Determine how steep is the filter's shelf transition.
@end table
@section tremolo
Sinusoidal amplitude modulation.
The filter accepts the following options:
@table @option
@item f
Modulation frequency in Hertz. Modulation frequencies in the subharmonic range
(20 Hz or lower) will result in a tremolo effect.
This filter may also be used as a ring modulator by specifying
a modulation frequency higher than 20 Hz.
Range is 0.1 - 20000.0. Default value is 5.0 Hz.
@item d
Depth of modulation as a percentage. Range is 0.0 - 1.0.
Default value is 0.5.
@end table
@section volume
Adjust the input audio volume.
...
...
libavfilter/Makefile
浏览文件 @
a9509ad3
...
...
@@ -84,6 +84,7 @@ OBJS-$(CONFIG_SILENCEREMOVE_FILTER) += af_silenceremove.o
OBJS-$(CONFIG_STEREOTOOLS_FILTER)
+=
af_stereotools.o
OBJS-$(CONFIG_STEREOWIDEN_FILTER)
+=
af_stereowiden.o
OBJS-$(CONFIG_TREBLE_FILTER)
+=
af_biquads.o
OBJS-$(CONFIG_TREMOLO_FILTER)
+=
af_tremolo.o generate_wave_table.o
OBJS-$(CONFIG_VOLUME_FILTER)
+=
af_volume.o
OBJS-$(CONFIG_VOLUMEDETECT_FILTER)
+=
af_volumedetect.o
...
...
libavfilter/af_tremolo.c
0 → 100644
浏览文件 @
a9509ad3
/*
* Copyright (c) 2015 Kyle Swanson <k@ylo.ph>.
*
* 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
*/
#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "audio.h"
#include "generate_wave_table.h"
typedef
struct
TremoloContext
{
const
AVClass
*
class
;
double
freq
;
double
depth
;
double
*
wave_table
;
int
wave_table_index
;
int
sample_rate
;
}
TremoloContext
;
#define OFFSET(x) offsetof(TremoloContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static
const
AVOption
tremolo_options
[]
=
{
{
"f"
,
"set frequency in hertz"
,
OFFSET
(
freq
),
AV_OPT_TYPE_DOUBLE
,
{.
dbl
=
5
.
0
},
0
.
1
,
20000
.
0
,
FLAGS
},
{
"d"
,
"set depth as percentage"
,
OFFSET
(
depth
),
AV_OPT_TYPE_DOUBLE
,
{.
dbl
=
0
.
5
},
0
.
0
,
1
.
0
,
FLAGS
},
{
NULL
}
};
AVFILTER_DEFINE_CLASS
(
tremolo
);
static
double
trem_env
(
AVFilterContext
*
ctx
)
{
TremoloContext
*
s
=
ctx
->
priv
;
double
env
=
s
->
wave_table
[
s
->
wave_table_index
];
s
->
wave_table_index
++
;
if
(
s
->
wave_table_index
>=
s
->
sample_rate
/
s
->
freq
)
s
->
wave_table_index
=
0
;
return
1
.
0
-
(
s
->
depth
*
env
);
}
static
int
filter_frame
(
AVFilterLink
*
inlink
,
AVFrame
*
in
)
{
AVFilterContext
*
ctx
=
inlink
->
dst
;
AVFilterLink
*
outlink
=
ctx
->
outputs
[
0
];
const
double
*
src
=
(
const
double
*
)
in
->
data
[
0
];
const
int
channels
=
inlink
->
channels
;
const
int
nb_samples
=
in
->
nb_samples
;
AVFrame
*
out
;
double
*
dst
;
int
n
,
c
;
if
(
av_frame_is_writable
(
in
))
{
out
=
in
;
}
else
{
out
=
ff_get_audio_buffer
(
inlink
,
in
->
nb_samples
);
if
(
!
out
)
{
av_frame_free
(
&
in
);
return
AVERROR
(
ENOMEM
);
}
av_frame_copy_props
(
out
,
in
);
}
dst
=
(
double
*
)
out
->
data
[
0
];
for
(
n
=
0
;
n
<
nb_samples
;
n
++
)
{
const
double
env
=
trem_env
(
ctx
);
for
(
c
=
0
;
c
<
channels
;
c
++
)
dst
[
c
]
=
src
[
c
]
*
env
;
dst
+=
channels
;
src
+=
channels
;
}
if
(
in
!=
out
)
av_frame_free
(
&
in
);
return
ff_filter_frame
(
outlink
,
out
);
}
static
int
query_formats
(
AVFilterContext
*
ctx
)
{
AVFilterFormats
*
formats
;
AVFilterChannelLayouts
*
layouts
;
static
const
enum
AVSampleFormat
sample_fmts
[]
=
{
AV_SAMPLE_FMT_DBL
,
AV_SAMPLE_FMT_NONE
};
int
ret
;
layouts
=
ff_all_channel_counts
();
if
(
!
layouts
)
return
AVERROR
(
ENOMEM
);
ret
=
ff_set_common_channel_layouts
(
ctx
,
layouts
);
if
(
ret
<
0
)
return
ret
;
formats
=
ff_make_format_list
(
sample_fmts
);
if
(
!
formats
)
return
AVERROR
(
ENOMEM
);
ret
=
ff_set_common_formats
(
ctx
,
formats
);
if
(
ret
<
0
)
return
ret
;
formats
=
ff_all_samplerates
();
if
(
!
formats
)
return
AVERROR
(
ENOMEM
);
return
ff_set_common_samplerates
(
ctx
,
formats
);
}
static
av_cold
void
uninit
(
AVFilterContext
*
ctx
)
{
TremoloContext
*
s
=
ctx
->
priv
;
av_freep
(
&
s
->
wave_table
);
}
static
int
config_input
(
AVFilterLink
*
inlink
)
{
AVFilterContext
*
ctx
=
inlink
->
dst
;
TremoloContext
*
s
=
ctx
->
priv
;
s
->
sample_rate
=
inlink
->
sample_rate
;
s
->
wave_table
=
av_malloc_array
(
s
->
sample_rate
/
s
->
freq
,
sizeof
(
*
s
->
wave_table
));
if
(
!
s
->
wave_table
)
return
AVERROR
(
ENOMEM
);
ff_generate_wave_table
(
WAVE_SIN
,
AV_SAMPLE_FMT_DBL
,
s
->
wave_table
,
s
->
sample_rate
/
s
->
freq
,
0
.
0
,
1
.
0
,
0
.
0
);
s
->
wave_table_index
=
0
;
return
0
;
}
static
const
AVFilterPad
avfilter_af_tremolo_inputs
[]
=
{
{
.
name
=
"default"
,
.
type
=
AVMEDIA_TYPE_AUDIO
,
.
config_props
=
config_input
,
.
filter_frame
=
filter_frame
,
},
{
NULL
}
};
static
const
AVFilterPad
avfilter_af_tremolo_outputs
[]
=
{
{
.
name
=
"default"
,
.
type
=
AVMEDIA_TYPE_AUDIO
,
},
{
NULL
}
};
AVFilter
ff_af_tremolo
=
{
.
name
=
"tremolo"
,
.
description
=
NULL_IF_CONFIG_SMALL
(
"Apply tremolo effect."
),
.
priv_size
=
sizeof
(
TremoloContext
),
.
priv_class
=
&
tremolo_class
,
.
uninit
=
uninit
,
.
query_formats
=
query_formats
,
.
inputs
=
avfilter_af_tremolo_inputs
,
.
outputs
=
avfilter_af_tremolo_outputs
,
};
libavfilter/allfilters.c
浏览文件 @
a9509ad3
...
...
@@ -106,6 +106,7 @@ void avfilter_register_all(void)
REGISTER_FILTER
(
STEREOTOOLS
,
stereotools
,
af
);
REGISTER_FILTER
(
STEREOWIDEN
,
stereowiden
,
af
);
REGISTER_FILTER
(
TREBLE
,
treble
,
af
);
REGISTER_FILTER
(
TREMOLO
,
tremolo
,
af
);
REGISTER_FILTER
(
VOLUME
,
volume
,
af
);
REGISTER_FILTER
(
VOLUMEDETECT
,
volumedetect
,
af
);
...
...
libavfilter/version.h
浏览文件 @
a9509ad3
...
...
@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 6
#define LIBAVFILTER_VERSION_MINOR
6
#define LIBAVFILTER_VERSION_MINOR
7
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
...
...
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