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Linshizhi
ffmpeg.wasm-core
Commits
a6a4793d
Commit
a6a4793d
authored
Dec 27, 2011
by
Luca Barbato
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v4l2: list available formats
Make use of the experimental framesize enumeration ioctl if available.
parent
cd2bbad3
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3 changed files
with
96 additions
and
8 deletions
+96
-8
configure
configure
+3
-0
indevs.texi
doc/indevs.texi
+1
-1
v4l2.c
libavdevice/v4l2.c
+92
-7
No files found.
configure
View file @
a6a4793d
...
...
@@ -1135,6 +1135,7 @@ HAVE_LIST="
struct_sockaddr_in6
struct_sockaddr_sa_len
struct_sockaddr_storage
struct_v4l2_frmivalenum_discrete
symver
symver_asm_label
symver_gnu_asm
...
...
@@ -2993,6 +2994,8 @@ texi2html -version > /dev/null 2>&1 && enable texi2html || disable texi2html
check_header linux/fb.h
check_header linux/videodev.h
check_header linux/videodev2.h
check_struct linux/videodev2.h
"struct v4l2_frmivalenum"
discrete
check_header sys/videoio.h
check_func_headers
"windows.h vfw.h"
capCreateCaptureWindow
"
$vfwcap_indev_extralibs
"
...
...
doc/indevs.texi
View file @
a6a4793d
...
...
@@ -267,7 +267,7 @@ the device.
Video4Linux and Video4Linux2 devices only support a limited set of
@var{width}x@var{height} sizes and framerates. You can check which are
supported for example with the command @file{dov4l} for Video4Linux
devices and
the command @file{v4l-info
} for Video4Linux2 devices.
devices and
using @command{-list_formats all
} for Video4Linux2 devices.
If the size for the device is set to 0x0, the input device will
try to autodetect the size to use.
...
...
libavdevice/v4l2.c
View file @
a6a4793d
...
...
@@ -51,6 +51,10 @@
static
const
int
desired_video_buffers
=
256
;
#define V4L_ALLFORMATS 3
#define V4L_RAWFORMATS 1
#define V4L_COMPFORMATS 2
struct
video_data
{
AVClass
*
class
;
int
fd
;
...
...
@@ -65,8 +69,10 @@ struct video_data {
unsigned
int
*
buf_len
;
char
*
standard
;
int
channel
;
char
*
video_size
;
/**< String describing video size, set by a private option. */
char
*
video_size
;
/**< String describing video size,
set by a private option. */
char
*
pixel_format
;
/**< Set by a private option. */
int
list_format
;
/**< Set by a private option. */
char
*
framerate
;
/**< Set by a private option. */
};
...
...
@@ -258,6 +264,69 @@ static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt)
return
CODEC_ID_NONE
;
}
#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
static
void
list_framesizes
(
AVFormatContext
*
ctx
,
int
fd
,
uint32_t
pixelformat
)
{
struct
v4l2_frmsizeenum
vfse
=
{
.
pixel_format
=
pixelformat
};
while
(
!
ioctl
(
fd
,
VIDIOC_ENUM_FRAMESIZES
,
&
vfse
))
{
switch
(
vfse
.
type
)
{
case
V4L2_FRMSIZE_TYPE_DISCRETE
:
av_log
(
ctx
,
AV_LOG_INFO
,
" %ux%u"
,
vfse
.
discrete
.
width
,
vfse
.
discrete
.
height
);
break
;
case
V4L2_FRMSIZE_TYPE_CONTINUOUS
:
case
V4L2_FRMSIZE_TYPE_STEPWISE
:
av_log
(
ctx
,
AV_LOG_INFO
,
" {%u-%u, %u}x{%u-%u, %u}"
,
vfse
.
stepwise
.
min_width
,
vfse
.
stepwise
.
max_width
,
vfse
.
stepwise
.
step_width
,
vfse
.
stepwise
.
min_height
,
vfse
.
stepwise
.
max_height
,
vfse
.
stepwise
.
step_height
);
}
vfse
.
index
++
;
}
}
#endif
static
void
list_formats
(
AVFormatContext
*
ctx
,
int
fd
,
int
type
)
{
struct
v4l2_fmtdesc
vfd
=
{
.
type
=
V4L2_BUF_TYPE_VIDEO_CAPTURE
};
while
(
!
ioctl
(
fd
,
VIDIOC_ENUM_FMT
,
&
vfd
))
{
enum
CodecID
codec_id
=
fmt_v4l2codec
(
vfd
.
pixelformat
);
enum
PixelFormat
pix_fmt
=
fmt_v4l2ff
(
vfd
.
pixelformat
,
codec_id
);
vfd
.
index
++
;
if
(
!
(
vfd
.
flags
&
V4L2_FMT_FLAG_COMPRESSED
)
&&
type
&
V4L_RAWFORMATS
)
{
const
char
*
fmt_name
=
av_get_pix_fmt_name
(
pix_fmt
);
av_log
(
ctx
,
AV_LOG_INFO
,
"R : %9s : %20s :"
,
fmt_name
?
fmt_name
:
"Unsupported"
,
vfd
.
description
);
}
else
if
(
vfd
.
flags
&
V4L2_FMT_FLAG_COMPRESSED
&&
type
&
V4L_COMPFORMATS
)
{
AVCodec
*
codec
=
avcodec_find_encoder
(
codec_id
);
av_log
(
ctx
,
AV_LOG_INFO
,
"C : %9s : %20s :"
,
codec
?
codec
->
name
:
"Unsupported"
,
vfd
.
description
);
}
else
{
continue
;
}
if
(
vfd
.
flags
&
V4L2_FMT_FLAG_EMULATED
)
{
av_log
(
ctx
,
AV_LOG_WARNING
,
"%s"
,
"Emulated"
);
continue
;
}
#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
list_framesizes
(
ctx
,
fd
,
vfd
.
pixelformat
);
#endif
av_log
(
ctx
,
AV_LOG_INFO
,
"
\n
"
);
}
}
static
int
mmap_init
(
AVFormatContext
*
ctx
)
{
struct
video_data
*
s
=
ctx
->
priv_data
;
...
...
@@ -621,6 +690,12 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
goto
out
;
}
if
(
s
->
list_format
)
{
list_formats
(
s1
,
s
->
fd
,
s
->
list_format
);
res
=
AVERROR_EXIT
;
goto
out
;
}
avpriv_set_pts_info
(
st
,
64
,
1
,
1000000
);
/* 64 bits pts in us */
if
(
s
->
video_size
&&
...
...
@@ -629,13 +704,19 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
s
->
video_size
);
goto
out
;
}
if
(
s
->
pixel_format
&&
(
pix_fmt
=
av_get_pix_fmt
(
s
->
pixel_format
))
==
PIX_FMT_NONE
)
{
if
(
s
->
pixel_format
)
{
pix_fmt
=
av_get_pix_fmt
(
s
->
pixel_format
);
if
(
pix_fmt
==
PIX_FMT_NONE
)
{
av_log
(
s1
,
AV_LOG_ERROR
,
"No such pixel format: %s.
\n
"
,
s
->
pixel_format
);
res
=
AVERROR
(
EINVAL
);
goto
out
;
}
}
if
(
!
s
->
width
&&
!
s
->
height
)
{
struct
v4l2_format
fmt
;
...
...
@@ -737,6 +818,10 @@ static const AVOption options[] = {
{
"video_size"
,
"A string describing frame size, such as 640x480 or hd720."
,
OFFSET
(
video_size
),
AV_OPT_TYPE_STRING
,
{.
str
=
NULL
},
0
,
0
,
DEC
},
{
"pixel_format"
,
""
,
OFFSET
(
pixel_format
),
AV_OPT_TYPE_STRING
,
{.
str
=
NULL
},
0
,
0
,
DEC
},
{
"framerate"
,
""
,
OFFSET
(
framerate
),
AV_OPT_TYPE_STRING
,
{.
str
=
NULL
},
0
,
0
,
DEC
},
{
"list_formats"
,
"List available formats and exit"
,
OFFSET
(
list_format
),
AV_OPT_TYPE_INT
,
{.
dbl
=
0
},
0
,
INT_MAX
,
DEC
,
"list_formats"
},
{
"all"
,
"Show all available formats"
,
OFFSET
(
list_format
),
AV_OPT_TYPE_CONST
,
{.
dbl
=
V4L_ALLFORMATS
},
0
,
INT_MAX
,
DEC
,
"list_formats"
},
{
"raw"
,
"Show only non-compressed formats"
,
OFFSET
(
list_format
),
AV_OPT_TYPE_CONST
,
{.
dbl
=
V4L_RAWFORMATS
},
0
,
INT_MAX
,
DEC
,
"list_formats"
},
{
"compressed"
,
"Show only compressed formats"
,
OFFSET
(
list_format
),
AV_OPT_TYPE_CONST
,
{.
dbl
=
V4L_COMPFORMATS
},
0
,
INT_MAX
,
DEC
,
"list_formats"
},
{
NULL
},
};
...
...
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