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Stefan Westerfeld
ffmpeg
Commits
ac7d2128
Commit
ac7d2128
authored
Jan 08, 2023
by
Paul B Mahol
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avfilter: add fractional delay IR source filter
parent
1ab0f83b
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6
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6 changed files
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204 additions
and
1 deletion
+204
-1
Changelog
Changelog
+1
-0
filters.texi
doc/filters.texi
+27
-0
Makefile
libavfilter/Makefile
+1
-0
allfilters.c
libavfilter/allfilters.c
+1
-0
asrc_afdelaysrc.c
libavfilter/asrc_afdelaysrc.c
+173
-0
version.h
libavfilter/version.h
+1
-1
No files found.
Changelog
View file @
ac7d2128
...
...
@@ -28,6 +28,7 @@ version <next>:
- showcwt multimedia filter
- corr video filter
- adrc audio filter
- afdelaysrc audio filter
version 5.1:
...
...
doc/filters.texi
View file @
ac7d2128
...
...
@@ -7519,6 +7519,33 @@ aevalsrc="0.1*sin(2*PI*(360-2.5/2)*t) | 0.1*sin(2*PI*(360+2.5/2)*t)"
@end itemize
@section afdelaysrc
Generate a fractional delay FIR coefficients.
The resulting stream can be used with @ref{afir} filter for filtering the audio signal.
The filter accepts the following options:
@table @option
@item delay, d
Set the fractional delay. Default is 0.
@item sample_rate, r
Set the sample rate, default is 44100.
@item nb_samples, n
Set the number of samples per each frame. Default is 1024.
@item taps, t
Set the number of filter coefficents in output audio stream.
Default value is 0.
@item channel_layout, c
Specifies the channel layout, and can be a string representing a channel layout.
The default value of @var{channel_layout} is "stereo".
@end table
@section afirsrc
Generate a FIR coefficients using frequency sampling method.
...
...
libavfilter/Makefile
View file @
ac7d2128
...
...
@@ -171,6 +171,7 @@ OBJS-$(CONFIG_VOLUME_FILTER) += af_volume.o
OBJS-$(CONFIG_VOLUMEDETECT_FILTER)
+=
af_volumedetect.o
OBJS-$(CONFIG_AEVALSRC_FILTER)
+=
aeval.o
OBJS-$(CONFIG_AFDELAYSRC_FILTER)
+=
asrc_afdelaysrc.o
OBJS-$(CONFIG_AFIRSRC_FILTER)
+=
asrc_afirsrc.o
OBJS-$(CONFIG_ANOISESRC_FILTER)
+=
asrc_anoisesrc.o
OBJS-$(CONFIG_ANULLSRC_FILTER)
+=
asrc_anullsrc.o
...
...
libavfilter/allfilters.c
View file @
ac7d2128
...
...
@@ -159,6 +159,7 @@ extern const AVFilter ff_af_volume;
extern
const
AVFilter
ff_af_volumedetect
;
extern
const
AVFilter
ff_asrc_aevalsrc
;
extern
const
AVFilter
ff_asrc_afdelaysrc
;
extern
const
AVFilter
ff_asrc_afirsrc
;
extern
const
AVFilter
ff_asrc_anoisesrc
;
extern
const
AVFilter
ff_asrc_anullsrc
;
...
...
libavfilter/asrc_afdelaysrc.c
0 → 100644
View file @
ac7d2128
/*
* Copyright (c) 2023 Paul B Mahol
*
* 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/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "internal.h"
typedef
struct
AFDelaySrcContext
{
const
AVClass
*
class
;
double
delay
;
int
sample_rate
;
int
nb_samples
;
int
nb_taps
;
AVChannelLayout
chlayout
;
char
*
chlayout_str
;
int64_t
pts
;
}
AFDelaySrcContext
;
static
av_cold
int
init
(
AVFilterContext
*
ctx
)
{
AFDelaySrcContext
*
s
=
ctx
->
priv
;
int
ret
;
ret
=
ff_parse_channel_layout
(
&
s
->
chlayout
,
NULL
,
s
->
chlayout_str
,
ctx
);
if
(
ret
<
0
)
return
ret
;
return
0
;
}
static
float
sincf
(
float
x
)
{
if
(
x
==
0
.
f
)
return
1
.
f
;
return
sinf
(
M_PI
*
x
)
/
(
M_PI
*
x
);
}
static
int
activate
(
AVFilterContext
*
ctx
)
{
AVFilterLink
*
outlink
=
ctx
->
outputs
[
0
];
AFDelaySrcContext
*
s
=
ctx
->
priv
;
AVFrame
*
frame
=
NULL
;
int
nb_samples
;
float
*
dst
;
if
(
!
ff_outlink_frame_wanted
(
outlink
))
return
FFERROR_NOT_READY
;
nb_samples
=
FFMIN
(
s
->
nb_samples
,
s
->
nb_taps
-
s
->
pts
);
if
(
nb_samples
<=
0
)
{
ff_outlink_set_status
(
outlink
,
AVERROR_EOF
,
s
->
pts
);
return
0
;
}
if
(
!
(
frame
=
ff_get_audio_buffer
(
outlink
,
nb_samples
)))
return
AVERROR
(
ENOMEM
);
dst
=
(
float
*
)
frame
->
extended_data
[
0
];
for
(
int
n
=
0
;
n
<
nb_samples
;
n
++
)
{
float
x
=
s
->
pts
+
n
;
dst
[
n
]
=
sincf
(
x
-
s
->
delay
)
*
cosf
(
M_PI
*
(
x
-
s
->
delay
)
/
s
->
nb_taps
)
/
sincf
((
x
-
s
->
delay
)
/
s
->
nb_taps
);
}
for
(
int
ch
=
1
;
ch
<
frame
->
ch_layout
.
nb_channels
;
ch
++
)
memcpy
(
frame
->
extended_data
[
ch
],
dst
,
sizeof
(
*
dst
)
*
nb_samples
);
frame
->
pts
=
s
->
pts
;
s
->
pts
+=
nb_samples
;
return
ff_filter_frame
(
outlink
,
frame
);
}
static
int
query_formats
(
AVFilterContext
*
ctx
)
{
AFDelaySrcContext
*
s
=
ctx
->
priv
;
AVChannelLayout
chlayouts
[]
=
{
s
->
chlayout
,
{
0
}
};
int
sample_rates
[]
=
{
s
->
sample_rate
,
-
1
};
static
const
enum
AVSampleFormat
sample_fmts
[]
=
{
AV_SAMPLE_FMT_FLTP
,
AV_SAMPLE_FMT_NONE
};
int
ret
=
ff_set_common_formats_from_list
(
ctx
,
sample_fmts
);
if
(
ret
<
0
)
return
ret
;
ret
=
ff_set_common_channel_layouts_from_list
(
ctx
,
chlayouts
);
if
(
ret
<
0
)
return
ret
;
return
ff_set_common_samplerates_from_list
(
ctx
,
sample_rates
);
}
static
int
config_output
(
AVFilterLink
*
outlink
)
{
AVFilterContext
*
ctx
=
outlink
->
src
;
AFDelaySrcContext
*
s
=
ctx
->
priv
;
outlink
->
sample_rate
=
s
->
sample_rate
;
s
->
pts
=
0
;
if
(
s
->
nb_taps
<=
0
)
s
->
nb_taps
=
s
->
delay
*
8
+
1
;
return
0
;
}
static
const
AVFilterPad
afdelaysrc_outputs
[]
=
{
{
.
name
=
"default"
,
.
type
=
AVMEDIA_TYPE_AUDIO
,
.
config_props
=
config_output
,
},
};
static
av_cold
void
uninit
(
AVFilterContext
*
ctx
)
{
AFDelaySrcContext
*
s
=
ctx
->
priv
;
av_channel_layout_uninit
(
&
s
->
chlayout
);
}
#define AF AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define OFFSET(x) offsetof(AFDelaySrcContext, x)
static
const
AVOption
afdelaysrc_options
[]
=
{
{
"delay"
,
"set fractional delay"
,
OFFSET
(
delay
),
AV_OPT_TYPE_DOUBLE
,{.
dbl
=
0
},
0
,
INT16_MAX
,
AF
},
{
"d"
,
"set fractional delay"
,
OFFSET
(
delay
),
AV_OPT_TYPE_DOUBLE
,{.
dbl
=
0
},
0
,
INT16_MAX
,
AF
},
{
"sample_rate"
,
"set sample rate"
,
OFFSET
(
sample_rate
),
AV_OPT_TYPE_INT
,
{.
i64
=
44100
},
1
,
INT_MAX
,
AF
},
{
"r"
,
"set sample rate"
,
OFFSET
(
sample_rate
),
AV_OPT_TYPE_INT
,
{.
i64
=
44100
},
1
,
INT_MAX
,
AF
},
{
"nb_samples"
,
"set the number of samples per requested frame"
,
OFFSET
(
nb_samples
),
AV_OPT_TYPE_INT
,
{.
i64
=
1024
},
1
,
INT_MAX
,
AF
},
{
"n"
,
"set the number of samples per requested frame"
,
OFFSET
(
nb_samples
),
AV_OPT_TYPE_INT
,
{.
i64
=
1024
},
1
,
INT_MAX
,
AF
},
{
"taps"
,
"set number of taps for delay filter"
,
OFFSET
(
nb_taps
),
AV_OPT_TYPE_INT
,
{.
i64
=
0
},
0
,
32768
,
AF
},
{
"t"
,
"set number of taps for delay filter"
,
OFFSET
(
nb_taps
),
AV_OPT_TYPE_INT
,
{.
i64
=
0
},
0
,
32768
,
AF
},
{
"channel_layout"
,
"set channel layout"
,
OFFSET
(
chlayout_str
),
AV_OPT_TYPE_STRING
,{.
str
=
"stereo"
},
0
,
0
,
AF
},
{
"c"
,
"set channel layout"
,
OFFSET
(
chlayout_str
),
AV_OPT_TYPE_STRING
,{.
str
=
"stereo"
},
0
,
0
,
AF
},
{
NULL
}
};
AVFILTER_DEFINE_CLASS
(
afdelaysrc
);
const
AVFilter
ff_asrc_afdelaysrc
=
{
.
name
=
"afdelaysrc"
,
.
description
=
NULL_IF_CONFIG_SMALL
(
"Generate a Fractional delay FIR coefficients."
),
.
priv_size
=
sizeof
(
AFDelaySrcContext
),
.
priv_class
=
&
afdelaysrc_class
,
.
init
=
init
,
.
activate
=
activate
,
.
uninit
=
uninit
,
.
inputs
=
NULL
,
FILTER_OUTPUTS
(
afdelaysrc_outputs
),
FILTER_QUERY_FUNC
(
query_formats
),
};
libavfilter/version.h
View file @
ac7d2128
...
...
@@ -31,7 +31,7 @@
#include "version_major.h"
#define LIBAVFILTER_VERSION_MINOR 5
3
#define LIBAVFILTER_VERSION_MINOR 5
4
#define LIBAVFILTER_VERSION_MICRO 100
...
...
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