blob: 019841fc662e664289eb42830cf987f00aef8bd1 [file] [log] [blame]
From dcb49656a8af3d454bb75c06cb30a2eb8651c081 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Date: Tue, 12 Apr 2016 19:40:46 -0300
Subject: [PATCH 207/286] [media] v4l: Add metadata buffer type and format
The metadata buffer type is used to transfer metadata between userspace
and kernelspace through a V4L2 buffers queue. It comes with a new
metadata capture capability and format description.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Guennadi Liakhovetski <guennadi.liakhovetski@intel.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
[hans.verkuil@cisco.com: removed left-over 'experimental' note]
[hans.verkuil@cisco.com: add newline after _v4l2-meta-format label]
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
(cherry picked from commit fb9ffa6a7f7ef39cc0f14f417b66411be5492512)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
Documentation/media/uapi/v4l/buffer.rst | 3 +
Documentation/media/uapi/v4l/dev-meta.rst | 58 +++++++++++++++++++++++
Documentation/media/uapi/v4l/devices.rst | 1
Documentation/media/uapi/v4l/vidioc-querycap.rst | 3 +
Documentation/media/videodev2.h.rst.exceptions | 2
drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 19 +++++++
drivers/media/v4l2-core/v4l2-dev.c | 16 +++---
drivers/media/v4l2-core/v4l2-ioctl.c | 34 +++++++++++++
drivers/media/v4l2-core/videobuf2-v4l2.c | 3 +
include/media/v4l2-ioctl.h | 17 ++++++
include/trace/events/v4l2.h | 1
include/uapi/linux/videodev2.h | 13 +++++
12 files changed, 164 insertions(+), 6 deletions(-)
create mode 100644 Documentation/media/uapi/v4l/dev-meta.rst
--- a/Documentation/media/uapi/v4l/buffer.rst
+++ b/Documentation/media/uapi/v4l/buffer.rst
@@ -330,6 +330,9 @@ enum v4l2_buf_type
- 12
- Buffer for Software Defined Radio (SDR) output stream, see
:ref:`sdr`.
+ * - ``V4L2_BUF_TYPE_META_CAPTURE``
+ - 13
+ - Buffer for metadata capture, see :ref:`metadata`.
--- /dev/null
+++ b/Documentation/media/uapi/v4l/dev-meta.rst
@@ -0,0 +1,58 @@
+.. -*- coding: utf-8; mode: rst -*-
+
+.. _metadata:
+
+******************
+Metadata Interface
+******************
+
+Metadata refers to any non-image data that supplements video frames with
+additional information. This may include statistics computed over the image
+or frame capture parameters supplied by the image source. This interface is
+intended for transfer of metadata to userspace and control of that operation.
+
+The metadata interface is implemented on video capture device nodes. The device
+can be dedicated to metadata or can implement both video and metadata capture
+as specified in its reported capabilities.
+
+Querying Capabilities
+=====================
+
+Device nodes supporting the metadata interface set the ``V4L2_CAP_META_CAPTURE``
+flag in the ``device_caps`` field of the
+:c:type:`v4l2_capability` structure returned by the :c:func:`VIDIOC_QUERYCAP`
+ioctl. That flag means the device can capture metadata to memory.
+
+At least one of the read/write or streaming I/O methods must be supported.
+
+
+Data Format Negotiation
+=======================
+
+The metadata device uses the :ref:`format` ioctls to select the capture format.
+The metadata buffer content format is bound to that selected format. In addition
+to the basic :ref:`format` ioctls, the :c:func:`VIDIOC_ENUM_FMT` ioctl must be
+supported as well.
+
+To use the :ref:`format` ioctls applications set the ``type`` field of the
+:c:type:`v4l2_format` structure to ``V4L2_BUF_TYPE_META_CAPTURE`` and use the
+:c:type:`v4l2_meta_format` ``meta`` member of the ``fmt`` union as needed per
+the desired operation. Both drivers and applications must set the remainder of
+the :c:type:`v4l2_format` structure to 0.
+
+.. _v4l2-meta-format:
+
+.. flat-table:: struct v4l2_meta_format
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u32
+ - ``dataformat``
+ - The data format, set by the application. This is a little endian
+ :ref:`four character code <v4l2-fourcc>`. V4L2 defines metadata formats
+ in :ref:`meta-formats`.
+ * - __u32
+ - ``buffersize``
+ - Maximum buffer size in bytes required for data. The value is set by the
+ driver.
--- a/Documentation/media/uapi/v4l/devices.rst
+++ b/Documentation/media/uapi/v4l/devices.rst
@@ -25,3 +25,4 @@ Interfaces
dev-touch
dev-event
dev-subdev
+ dev-meta
--- a/Documentation/media/uapi/v4l/vidioc-querycap.rst
+++ b/Documentation/media/uapi/v4l/vidioc-querycap.rst
@@ -236,6 +236,9 @@ specification the ioctl returns an ``EIN
* - ``V4L2_CAP_SDR_OUTPUT``
- 0x00400000
- The device supports the :ref:`SDR Output <sdr>` interface.
+ * - ``V4L2_CAP_META_CAPTURE``
+ - 0x00800000
+ - The device supports the :ref:`metadata` capture interface.
* - ``V4L2_CAP_READWRITE``
- 0x01000000
- The device supports the :ref:`read() <rw>` and/or
--- a/Documentation/media/videodev2.h.rst.exceptions
+++ b/Documentation/media/videodev2.h.rst.exceptions
@@ -27,6 +27,7 @@ replace symbol V4L2_FIELD_SEQ_TB :c:type
replace symbol V4L2_FIELD_TOP :c:type:`v4l2_field`
# Documented enum v4l2_buf_type
+replace symbol V4L2_BUF_TYPE_META_CAPTURE :c:type:`v4l2_buf_type`
replace symbol V4L2_BUF_TYPE_SDR_CAPTURE :c:type:`v4l2_buf_type`
replace symbol V4L2_BUF_TYPE_SDR_OUTPUT :c:type:`v4l2_buf_type`
replace symbol V4L2_BUF_TYPE_SLICED_VBI_CAPTURE :c:type:`v4l2_buf_type`
@@ -148,6 +149,7 @@ replace define V4L2_CAP_MODULATOR device
replace define V4L2_CAP_SDR_CAPTURE device-capabilities
replace define V4L2_CAP_EXT_PIX_FORMAT device-capabilities
replace define V4L2_CAP_SDR_OUTPUT device-capabilities
+replace define V4L2_CAP_META_CAPTURE device-capabilities
replace define V4L2_CAP_READWRITE device-capabilities
replace define V4L2_CAP_ASYNCIO device-capabilities
replace define V4L2_CAP_STREAMING device-capabilities
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -161,6 +161,20 @@ static inline int put_v4l2_sdr_format(st
return 0;
}
+static inline int get_v4l2_meta_format(struct v4l2_meta_format *kp, struct v4l2_meta_format __user *up)
+{
+ if (copy_from_user(kp, up, sizeof(struct v4l2_meta_format)))
+ return -EFAULT;
+ return 0;
+}
+
+static inline int put_v4l2_meta_format(struct v4l2_meta_format *kp, struct v4l2_meta_format __user *up)
+{
+ if (copy_to_user(up, kp, sizeof(struct v4l2_meta_format)))
+ return -EFAULT;
+ return 0;
+}
+
struct v4l2_format32 {
__u32 type; /* enum v4l2_buf_type */
union {
@@ -170,6 +184,7 @@ struct v4l2_format32 {
struct v4l2_vbi_format vbi;
struct v4l2_sliced_vbi_format sliced;
struct v4l2_sdr_format sdr;
+ struct v4l2_meta_format meta;
__u8 raw_data[200]; /* user-defined */
} fmt;
};
@@ -216,6 +231,8 @@ static int __get_v4l2_format32(struct v4
case V4L2_BUF_TYPE_SDR_CAPTURE:
case V4L2_BUF_TYPE_SDR_OUTPUT:
return get_v4l2_sdr_format(&kp->fmt.sdr, &up->fmt.sdr);
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ return get_v4l2_meta_format(&kp->fmt.meta, &up->fmt.meta);
default:
pr_info("compat_ioctl32: unexpected VIDIOC_FMT type %d\n",
kp->type);
@@ -263,6 +280,8 @@ static int __put_v4l2_format32(struct v4
case V4L2_BUF_TYPE_SDR_CAPTURE:
case V4L2_BUF_TYPE_SDR_OUTPUT:
return put_v4l2_sdr_format(&kp->fmt.sdr, &up->fmt.sdr);
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ return put_v4l2_meta_format(&kp->fmt.meta, &up->fmt.meta);
default:
pr_info("compat_ioctl32: unexpected VIDIOC_FMT type %d\n",
kp->type);
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -575,30 +575,34 @@ static void determine_valid_ioctls(struc
set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls);
if (is_vid || is_tch) {
- /* video specific ioctls */
+ /* video and metadata specific ioctls */
if ((is_rx && (ops->vidioc_enum_fmt_vid_cap ||
ops->vidioc_enum_fmt_vid_cap_mplane ||
- ops->vidioc_enum_fmt_vid_overlay)) ||
+ ops->vidioc_enum_fmt_vid_overlay ||
+ ops->vidioc_enum_fmt_meta_cap)) ||
(is_tx && (ops->vidioc_enum_fmt_vid_out ||
ops->vidioc_enum_fmt_vid_out_mplane)))
set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls);
if ((is_rx && (ops->vidioc_g_fmt_vid_cap ||
ops->vidioc_g_fmt_vid_cap_mplane ||
- ops->vidioc_g_fmt_vid_overlay)) ||
+ ops->vidioc_g_fmt_vid_overlay ||
+ ops->vidioc_g_fmt_meta_cap)) ||
(is_tx && (ops->vidioc_g_fmt_vid_out ||
ops->vidioc_g_fmt_vid_out_mplane ||
ops->vidioc_g_fmt_vid_out_overlay)))
set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
if ((is_rx && (ops->vidioc_s_fmt_vid_cap ||
ops->vidioc_s_fmt_vid_cap_mplane ||
- ops->vidioc_s_fmt_vid_overlay)) ||
+ ops->vidioc_s_fmt_vid_overlay ||
+ ops->vidioc_s_fmt_meta_cap)) ||
(is_tx && (ops->vidioc_s_fmt_vid_out ||
ops->vidioc_s_fmt_vid_out_mplane ||
ops->vidioc_s_fmt_vid_out_overlay)))
set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
if ((is_rx && (ops->vidioc_try_fmt_vid_cap ||
ops->vidioc_try_fmt_vid_cap_mplane ||
- ops->vidioc_try_fmt_vid_overlay)) ||
+ ops->vidioc_try_fmt_vid_overlay ||
+ ops->vidioc_try_fmt_meta_cap)) ||
(is_tx && (ops->vidioc_try_fmt_vid_out ||
ops->vidioc_try_fmt_vid_out_mplane ||
ops->vidioc_try_fmt_vid_out_overlay)))
@@ -664,7 +668,7 @@ static void determine_valid_ioctls(struc
}
if (is_vid || is_vbi || is_sdr || is_tch) {
- /* ioctls valid for video, vbi or sdr */
+ /* ioctls valid for video, metadata, vbi or sdr */
SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs);
SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf);
SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf);
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -155,6 +155,7 @@ const char *v4l2_type_names[] = {
[V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE] = "vid-out-mplane",
[V4L2_BUF_TYPE_SDR_CAPTURE] = "sdr-cap",
[V4L2_BUF_TYPE_SDR_OUTPUT] = "sdr-out",
+ [V4L2_BUF_TYPE_META_CAPTURE] = "meta-cap",
};
EXPORT_SYMBOL(v4l2_type_names);
@@ -249,6 +250,7 @@ static void v4l_print_format(const void
const struct v4l2_sliced_vbi_format *sliced;
const struct v4l2_window *win;
const struct v4l2_sdr_format *sdr;
+ const struct v4l2_meta_format *meta;
unsigned i;
pr_cont("type=%s", prt_names(p->type, v4l2_type_names));
@@ -336,6 +338,15 @@ static void v4l_print_format(const void
(sdr->pixelformat >> 16) & 0xff,
(sdr->pixelformat >> 24) & 0xff);
break;
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ meta = &p->fmt.meta;
+ pr_cont(", dataformat=%c%c%c%c, buffersize=%u\n",
+ (meta->dataformat >> 0) & 0xff,
+ (meta->dataformat >> 8) & 0xff,
+ (meta->dataformat >> 16) & 0xff,
+ (meta->dataformat >> 24) & 0xff,
+ meta->buffersize);
+ break;
}
}
@@ -982,6 +993,10 @@ static int check_fmt(struct file *file,
if (is_sdr && is_tx && ops->vidioc_g_fmt_sdr_out)
return 0;
break;
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ if (is_vid && is_rx && ops->vidioc_g_fmt_meta_cap)
+ return 0;
+ break;
default:
break;
}
@@ -1357,6 +1372,11 @@ static int v4l_enum_fmt(const struct v4l
break;
ret = ops->vidioc_enum_fmt_sdr_out(file, fh, arg);
break;
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ if (unlikely(!is_rx || !is_vid || !ops->vidioc_enum_fmt_meta_cap))
+ break;
+ ret = ops->vidioc_enum_fmt_meta_cap(file, fh, arg);
+ break;
}
if (ret == 0)
v4l_fill_fmtdesc(p);
@@ -1456,6 +1476,10 @@ static int v4l_g_fmt(const struct v4l2_i
if (unlikely(!is_tx || !is_sdr || !ops->vidioc_g_fmt_sdr_out))
break;
return ops->vidioc_g_fmt_sdr_out(file, fh, arg);
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ if (unlikely(!is_rx || !is_vid || !ops->vidioc_g_fmt_meta_cap))
+ break;
+ return ops->vidioc_g_fmt_meta_cap(file, fh, arg);
}
return -EINVAL;
}
@@ -1561,6 +1585,11 @@ static int v4l_s_fmt(const struct v4l2_i
break;
CLEAR_AFTER_FIELD(p, fmt.sdr);
return ops->vidioc_s_fmt_sdr_out(file, fh, arg);
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ if (unlikely(!is_rx || !is_vid || !ops->vidioc_s_fmt_meta_cap))
+ break;
+ CLEAR_AFTER_FIELD(p, fmt.meta);
+ return ops->vidioc_s_fmt_meta_cap(file, fh, arg);
}
return -EINVAL;
}
@@ -1646,6 +1675,11 @@ static int v4l_try_fmt(const struct v4l2
break;
CLEAR_AFTER_FIELD(p, fmt.sdr);
return ops->vidioc_try_fmt_sdr_out(file, fh, arg);
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ if (unlikely(!is_rx || !is_vid || !ops->vidioc_try_fmt_meta_cap))
+ break;
+ CLEAR_AFTER_FIELD(p, fmt.meta);
+ return ops->vidioc_try_fmt_meta_cap(file, fh, arg);
}
return -EINVAL;
}
--- a/drivers/media/v4l2-core/videobuf2-v4l2.c
+++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
@@ -546,6 +546,9 @@ int vb2_create_bufs(struct vb2_queue *q,
case V4L2_BUF_TYPE_SDR_OUTPUT:
requested_sizes[0] = f->fmt.sdr.buffersize;
break;
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ requested_sizes[0] = f->fmt.meta.buffersize;
+ break;
default:
return -EINVAL;
}
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -43,6 +43,9 @@ struct v4l2_fh;
* @vidioc_enum_fmt_sdr_out: pointer to the function that implements
* :ref:`VIDIOC_ENUM_FMT <vidioc_enum_fmt>` ioctl logic
* for Software Defined Radio output
+ * @vidioc_enum_fmt_meta_cap: pointer to the function that implements
+ * :ref:`VIDIOC_ENUM_FMT <vidioc_enum_fmt>` ioctl logic
+ * for metadata capture
* @vidioc_g_fmt_vid_cap: pointer to the function that implements
* :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for video capture
* in single plane mode
@@ -73,6 +76,8 @@ struct v4l2_fh;
* @vidioc_g_fmt_sdr_out: pointer to the function that implements
* :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for Software Defined
* Radio output
+ * @vidioc_g_fmt_meta_cap: pointer to the function that implements
+ * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for metadata capture
* @vidioc_s_fmt_vid_cap: pointer to the function that implements
* :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for video capture
* in single plane mode
@@ -103,6 +108,8 @@ struct v4l2_fh;
* @vidioc_s_fmt_sdr_out: pointer to the function that implements
* :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for Software Defined
* Radio output
+ * @vidioc_s_fmt_meta_cap: pointer to the function that implements
+ * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for metadata capture
* @vidioc_try_fmt_vid_cap: pointer to the function that implements
* :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for video capture
* in single plane mode
@@ -135,6 +142,8 @@ struct v4l2_fh;
* @vidioc_try_fmt_sdr_out: pointer to the function that implements
* :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for Software Defined
* Radio output
+ * @vidioc_try_fmt_meta_cap: pointer to the function that implements
+ * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for metadata capture
* @vidioc_reqbufs: pointer to the function that implements
* :ref:`VIDIOC_REQBUFS <vidioc_reqbufs>` ioctl
* @vidioc_querybuf: pointer to the function that implements
@@ -305,6 +314,8 @@ struct v4l2_ioctl_ops {
struct v4l2_fmtdesc *f);
int (*vidioc_enum_fmt_sdr_out)(struct file *file, void *fh,
struct v4l2_fmtdesc *f);
+ int (*vidioc_enum_fmt_meta_cap)(struct file *file, void *fh,
+ struct v4l2_fmtdesc *f);
/* VIDIOC_G_FMT handlers */
int (*vidioc_g_fmt_vid_cap)(struct file *file, void *fh,
@@ -331,6 +342,8 @@ struct v4l2_ioctl_ops {
struct v4l2_format *f);
int (*vidioc_g_fmt_sdr_out)(struct file *file, void *fh,
struct v4l2_format *f);
+ int (*vidioc_g_fmt_meta_cap)(struct file *file, void *fh,
+ struct v4l2_format *f);
/* VIDIOC_S_FMT handlers */
int (*vidioc_s_fmt_vid_cap)(struct file *file, void *fh,
@@ -357,6 +370,8 @@ struct v4l2_ioctl_ops {
struct v4l2_format *f);
int (*vidioc_s_fmt_sdr_out)(struct file *file, void *fh,
struct v4l2_format *f);
+ int (*vidioc_s_fmt_meta_cap)(struct file *file, void *fh,
+ struct v4l2_format *f);
/* VIDIOC_TRY_FMT handlers */
int (*vidioc_try_fmt_vid_cap)(struct file *file, void *fh,
@@ -383,6 +398,8 @@ struct v4l2_ioctl_ops {
struct v4l2_format *f);
int (*vidioc_try_fmt_sdr_out)(struct file *file, void *fh,
struct v4l2_format *f);
+ int (*vidioc_try_fmt_meta_cap)(struct file *file, void *fh,
+ struct v4l2_format *f);
/* Buffer handlers */
int (*vidioc_reqbufs)(struct file *file, void *fh,
--- a/include/trace/events/v4l2.h
+++ b/include/trace/events/v4l2.h
@@ -29,6 +29,7 @@
EM( V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE, "VIDEO_OUTPUT_MPLANE" ) \
EM( V4L2_BUF_TYPE_SDR_CAPTURE, "SDR_CAPTURE" ) \
EM( V4L2_BUF_TYPE_SDR_OUTPUT, "SDR_OUTPUT" ) \
+ EM( V4L2_BUF_TYPE_META_CAPTURE, "META_CAPTURE" ) \
EMe(V4L2_BUF_TYPE_PRIVATE, "PRIVATE" )
SHOW_TYPE
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -143,6 +143,7 @@ enum v4l2_buf_type {
V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE = 10,
V4L2_BUF_TYPE_SDR_CAPTURE = 11,
V4L2_BUF_TYPE_SDR_OUTPUT = 12,
+ V4L2_BUF_TYPE_META_CAPTURE = 13,
/* Deprecated, do not use */
V4L2_BUF_TYPE_PRIVATE = 0x80,
};
@@ -453,6 +454,7 @@ struct v4l2_capability {
#define V4L2_CAP_SDR_CAPTURE 0x00100000 /* Is a SDR capture device */
#define V4L2_CAP_EXT_PIX_FORMAT 0x00200000 /* Supports the extended pixel format */
#define V4L2_CAP_SDR_OUTPUT 0x00400000 /* Is a SDR output device */
+#define V4L2_CAP_META_CAPTURE 0x00800000 /* Is a metadata capture device */
#define V4L2_CAP_READWRITE 0x01000000 /* read/write systemcalls */
#define V4L2_CAP_ASYNCIO 0x02000000 /* async I/O */
@@ -2049,6 +2051,16 @@ struct v4l2_sdr_format {
} __attribute__ ((packed));
/**
+ * struct v4l2_meta_format - metadata format definition
+ * @dataformat: little endian four character code (fourcc)
+ * @buffersize: maximum size in bytes required for data
+ */
+struct v4l2_meta_format {
+ __u32 dataformat;
+ __u32 buffersize;
+} __attribute__ ((packed));
+
+/**
* struct v4l2_format - stream data format
* @type: enum v4l2_buf_type; type of the data stream
* @pix: definition of an image format
@@ -2067,6 +2079,7 @@ struct v4l2_format {
struct v4l2_vbi_format vbi; /* V4L2_BUF_TYPE_VBI_CAPTURE */
struct v4l2_sliced_vbi_format sliced; /* V4L2_BUF_TYPE_SLICED_VBI_CAPTURE */
struct v4l2_sdr_format sdr; /* V4L2_BUF_TYPE_SDR_CAPTURE */
+ struct v4l2_meta_format meta; /* V4L2_BUF_TYPE_META_CAPTURE */
__u8 raw_data[200]; /* user-defined */
} fmt;
};