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前往新版Gitcode,体验更适合开发者的 AI 搜索 >>
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683a1599
编写于
6月 21, 2020
作者:
P
Paul B Mahol
浏览文件
操作
浏览文件
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电子邮件补丁
差异文件
avfilter/af_ladspa: add latency compensation
上级
842bc312
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
60 addition
and
3 deletion
+60
-3
doc/filters.texi
doc/filters.texi
+3
-0
libavfilter/af_ladspa.c
libavfilter/af_ladspa.c
+57
-3
未找到文件。
doc/filters.texi
浏览文件 @
683a1599
...
...
@@ -4197,6 +4197,9 @@ If not specified, or the expressed duration is negative, the audio is
supposed to be generated forever.
Only used if plugin have zero inputs.
@item latency, l
Enable latency compensation, by default is disabled.
Only used if plugin have inputs.
@end table
@subsection Examples
...
...
libavfilter/af_ladspa.c
浏览文件 @
683a1599
...
...
@@ -64,6 +64,9 @@ typedef struct LADSPAContext {
int
nb_samples
;
int64_t
pts
;
int64_t
duration
;
int
in_trim
;
int
out_pad
;
int
latency
;
}
LADSPAContext
;
#define OFFSET(x) offsetof(LADSPAContext, x)
...
...
@@ -81,11 +84,28 @@ static const AVOption ladspa_options[] = {
{
"n"
,
"set the number of samples per requested frame"
,
OFFSET
(
nb_samples
),
AV_OPT_TYPE_INT
,
{.
i64
=
1024
},
1
,
INT_MAX
,
FLAGS
},
{
"duration"
,
"set audio duration"
,
OFFSET
(
duration
),
AV_OPT_TYPE_DURATION
,
{.
i64
=-
1
},
-
1
,
INT64_MAX
,
FLAGS
},
{
"d"
,
"set audio duration"
,
OFFSET
(
duration
),
AV_OPT_TYPE_DURATION
,
{.
i64
=-
1
},
-
1
,
INT64_MAX
,
FLAGS
},
{
"latency"
,
"enable latency compensation"
,
OFFSET
(
latency
),
AV_OPT_TYPE_BOOL
,
{.
i64
=
0
},
0
,
1
,
FLAGS
},
{
"l"
,
"enable latency compensation"
,
OFFSET
(
latency
),
AV_OPT_TYPE_BOOL
,
{.
i64
=
0
},
0
,
1
,
FLAGS
},
{
NULL
}
};
AVFILTER_DEFINE_CLASS
(
ladspa
);
static
int
find_latency
(
AVFilterContext
*
ctx
,
LADSPAContext
*
s
)
{
int
latency
=
0
;
for
(
int
ctl
=
0
;
ctl
<
s
->
nb_outputcontrols
;
ctl
++
)
{
if
(
av_strcasecmp
(
"latency"
,
s
->
desc
->
PortNames
[
s
->
ocmap
[
ctl
]]))
continue
;
latency
=
lrintf
(
s
->
octlv
[
ctl
]);
break
;
}
return
latency
;
}
static
void
print_ctl_info
(
AVFilterContext
*
ctx
,
int
level
,
LADSPAContext
*
s
,
int
ctl
,
unsigned
long
*
map
,
LADSPA_Data
*
values
,
int
print
)
...
...
@@ -143,12 +163,13 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFilterContext
*
ctx
=
inlink
->
dst
;
LADSPAContext
*
s
=
ctx
->
priv
;
AVFrame
*
out
;
int
i
,
h
,
p
;
int
i
,
h
,
p
,
new_out_samples
;
av_assert0
(
in
->
channels
==
(
s
->
nb_inputs
*
s
->
nb_handles
));
if
(
!
s
->
nb_outputs
||
(
av_frame_is_writable
(
in
)
&&
s
->
nb_inputs
==
s
->
nb_outputs
&&
s
->
in_trim
==
0
&&
s
->
out_pad
==
0
&&
!
(
s
->
desc
->
Properties
&
LADSPA_PROPERTY_INPLACE_BROKEN
)))
{
out
=
in
;
}
else
{
...
...
@@ -176,6 +197,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
}
s
->
desc
->
run
(
s
->
handles
[
h
],
in
->
nb_samples
);
if
(
s
->
latency
)
s
->
in_trim
=
s
->
out_pad
=
find_latency
(
ctx
,
s
);
s
->
latency
=
0
;
}
for
(
i
=
0
;
i
<
s
->
nb_outputcontrols
;
i
++
)
...
...
@@ -184,6 +208,25 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
if
(
out
!=
in
)
av_frame_free
(
&
in
);
new_out_samples
=
out
->
nb_samples
;
if
(
s
->
in_trim
>
0
)
{
int
trim
=
FFMIN
(
new_out_samples
,
s
->
in_trim
);
new_out_samples
-=
trim
;
s
->
in_trim
-=
trim
;
}
if
(
new_out_samples
<=
0
)
{
av_frame_free
(
&
out
);
return
0
;
}
else
if
(
new_out_samples
<
out
->
nb_samples
)
{
int
offset
=
out
->
nb_samples
-
new_out_samples
;
for
(
int
ch
=
0
;
ch
<
out
->
channels
;
ch
++
)
memmove
(
out
->
extended_data
[
ch
],
out
->
extended_data
[
ch
]
+
sizeof
(
float
)
*
offset
,
sizeof
(
float
)
*
new_out_samples
);
out
->
nb_samples
=
new_out_samples
;
}
return
ff_filter_frame
(
ctx
->
outputs
[
0
],
out
);
}
...
...
@@ -195,8 +238,19 @@ static int request_frame(AVFilterLink *outlink)
int64_t
t
;
int
i
;
if
(
ctx
->
nb_inputs
)
return
ff_request_frame
(
ctx
->
inputs
[
0
]);
if
(
ctx
->
nb_inputs
)
{
int
ret
=
ff_request_frame
(
ctx
->
inputs
[
0
]);
if
(
ret
==
AVERROR_EOF
&&
s
->
out_pad
>
0
)
{
AVFrame
*
frame
=
ff_get_audio_buffer
(
outlink
,
FFMIN
(
2048
,
s
->
out_pad
));
if
(
!
frame
)
return
AVERROR
(
ENOMEM
);
s
->
out_pad
-=
frame
->
nb_samples
;
return
filter_frame
(
ctx
->
inputs
[
0
],
frame
);
}
return
ret
;
}
t
=
av_rescale
(
s
->
pts
,
AV_TIME_BASE
,
s
->
sample_rate
);
if
(
s
->
duration
>=
0
&&
t
>=
s
->
duration
)
...
...
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