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submodule
ffmpeg
Commits
ea0ac11f
Commit
ea0ac11f
authored
Dec 21, 2014
by
Lukasz Marek
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lavd/v4l2: implement list device callback
Signed-off-by:
Lukasz Marek
<
lukasz.m.luki2@gmail.com
>
parent
44e6eeb3
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v4l2.c
libavdevice/v4l2.c
+77
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libavdevice/v4l2.c
View file @
ea0ac11f
...
@@ -31,6 +31,7 @@
...
@@ -31,6 +31,7 @@
*/
*/
#include "v4l2-common.h"
#include "v4l2-common.h"
#include <dirent.h>
#if CONFIG_LIBV4L2
#if CONFIG_LIBV4L2
#include <libv4l2.h>
#include <libv4l2.h>
...
@@ -1006,6 +1007,81 @@ static int v4l2_read_close(AVFormatContext *ctx)
...
@@ -1006,6 +1007,81 @@ static int v4l2_read_close(AVFormatContext *ctx)
return
0
;
return
0
;
}
}
static
int
v4l2_is_v4l_dev
(
const
char
*
name
)
{
return
!
strncmp
(
name
,
"video"
,
5
)
||
!
strncmp
(
name
,
"radio"
,
5
)
||
!
strncmp
(
name
,
"vbi"
,
3
)
||
!
strncmp
(
name
,
"v4l-subdev"
,
10
);
}
static
int
v4l2_get_device_list
(
AVFormatContext
*
ctx
,
AVDeviceInfoList
*
device_list
)
{
struct
video_data
*
s
=
ctx
->
priv_data
;
DIR
*
dir
;
struct
dirent
*
entry
;
AVDeviceInfo
*
device
=
NULL
;
struct
v4l2_capability
cap
;
int
ret
=
0
;
if
(
!
device_list
)
return
AVERROR
(
EINVAL
);
dir
=
opendir
(
"/dev"
);
if
(
!
dir
)
{
ret
=
AVERROR
(
errno
);
av_log
(
ctx
,
AV_LOG_ERROR
,
"Couldn't open the directory: %s
\n
"
,
av_err2str
(
ret
));
return
ret
;
}
while
((
entry
=
readdir
(
dir
)))
{
if
(
!
v4l2_is_v4l_dev
(
entry
->
d_name
))
continue
;
snprintf
(
ctx
->
filename
,
sizeof
(
ctx
->
filename
),
"/dev/%s"
,
entry
->
d_name
);
if
((
s
->
fd
=
device_open
(
ctx
))
<
0
)
continue
;
if
(
v4l2_ioctl
(
s
->
fd
,
VIDIOC_QUERYCAP
,
&
cap
)
<
0
)
{
ret
=
AVERROR
(
errno
);
av_log
(
ctx
,
AV_LOG_ERROR
,
"ioctl(VIDIOC_QUERYCAP): %s
\n
"
,
av_err2str
(
ret
));
goto
fail
;
}
device
=
av_mallocz
(
sizeof
(
AVDeviceInfo
));
if
(
!
device
)
{
ret
=
AVERROR
(
ENOMEM
);
goto
fail
;
}
device
->
device_name
=
av_strdup
(
ctx
->
filename
);
device
->
device_description
=
av_strdup
(
cap
.
card
);
if
(
!
device
->
device_name
||
!
device
->
device_description
)
{
ret
=
AVERROR
(
ENOMEM
);
goto
fail
;
}
if
((
ret
=
av_dynarray_add_nofree
(
&
device_list
->
devices
,
&
device_list
->
nb_devices
,
device
))
<
0
)
goto
fail
;
v4l2_close
(
s
->
fd
);
s
->
fd
=
-
1
;
continue
;
fail:
if
(
device
)
{
av_freep
(
&
device
->
device_name
);
av_freep
(
&
device
->
device_description
);
av_freep
(
&
device
);
}
if
(
s
->
fd
>=
0
)
v4l2_close
(
s
->
fd
);
s
->
fd
=
-
1
;
break
;
}
closedir
(
dir
);
return
ret
;
}
#define OFFSET(x) offsetof(struct video_data, x)
#define OFFSET(x) offsetof(struct video_data, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
#define DEC AV_OPT_FLAG_DECODING_PARAM
...
@@ -1050,6 +1126,7 @@ AVInputFormat ff_v4l2_demuxer = {
...
@@ -1050,6 +1126,7 @@ AVInputFormat ff_v4l2_demuxer = {
.
read_header
=
v4l2_read_header
,
.
read_header
=
v4l2_read_header
,
.
read_packet
=
v4l2_read_packet
,
.
read_packet
=
v4l2_read_packet
,
.
read_close
=
v4l2_read_close
,
.
read_close
=
v4l2_read_close
,
.
get_device_list
=
v4l2_get_device_list
,
.
flags
=
AVFMT_NOFILE
,
.
flags
=
AVFMT_NOFILE
,
.
priv_class
=
&
v4l2_class
,
.
priv_class
=
&
v4l2_class
,
};
};
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