On 09/02/2016 02:07 PM, Laurent Pinchart wrote:
> 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 <[email protected]>
> Tested-by: Guennadi Liakhovetski <[email protected]>
Looks good. But include/trace/events/v4l2.h needs to be updated with the new
buf_type as well.
I would also like to see patches for v4l2-ctl and v4l2-compliance. Having some
support for it in vivid would be nice as well, but is a lower prio.
Regards,
Hans
> ---
> Changes since v2:
>
> - Dropped the reserved field from struct v4l2_meta_format
> - Removed redundant documentation sentence
> - Fixed typos
>
> Changes since v1:
>
> - Rebased on top of the DocBook to reST conversion
>
> Documentation/media/uapi/v4l/buffer.rst | 8 +++
> Documentation/media/uapi/v4l/dev-meta.rst | 63
> ++++++++++++++++++++++++
> Documentation/media/uapi/v4l/devices.rst | 1 +
> Documentation/media/uapi/v4l/vidioc-querycap.rst | 14 ++++--
> 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/uapi/linux/videodev2.h | 13 +++++
> 11 files changed, 181 insertions(+), 9 deletions(-)
> create mode 100644 Documentation/media/uapi/v4l/dev-meta.rst
>
> diff --git a/Documentation/media/uapi/v4l/buffer.rst
> b/Documentation/media/uapi/v4l/buffer.rst
> index 5deb4a46f992..b5177cc63b86 100644
> --- a/Documentation/media/uapi/v4l/buffer.rst
> +++ b/Documentation/media/uapi/v4l/buffer.rst
> @@ -499,6 +499,14 @@ enum v4l2_buf_type
> - Buffer for Software Defined Radio (SDR) output stream, see
> :ref:`sdr`.
>
> + - .. row 13
> +
> + - ``V4L2_BUF_TYPE_META_CAPTURE``
> +
> + - 13
> +
> + - Buffer for metadata capture, see :ref:`metadata`.
> +
>
>
> .. _buffer-flags:
> diff --git a/Documentation/media/uapi/v4l/dev-meta.rst
> b/Documentation/media/uapi/v4l/dev-meta.rst
> new file mode 100644
> index 000000000000..d3a33fea9cc9
> --- /dev/null
> +++ b/Documentation/media/uapi/v4l/dev-meta.rst
> @@ -0,0 +1,63 @@
> +.. -*- 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.
> +
> +.. note::
> +
> + This is an :ref:`experimental` interface and may
> + change in the future.
> +
> +Querying Capabilities
> +=====================
> +
> +Device nodes supporting the metadata interface set the
> ``V4L2_CAP_META_CAPTURE``
> +flag in the ``device_caps`` field of the
> +:ref:`v4l2_capability <v4l2-capability>` structure returned by the
> +:ref:`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 :ref:`VIDIOC_ENUM_FMT` ioctl must be
> +supported as well.
> +
> +To use the :ref:`format` ioctls applications set the ``type`` field of the
> +:ref:`v4l2_format <v4l2-format>` structure to ``V4L2_BUF_TYPE_META_CAPTURE``
> +and use the :ref:`v4l2_meta_format <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 :ref:`v4l2_format <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.
> diff --git a/Documentation/media/uapi/v4l/devices.rst
> b/Documentation/media/uapi/v4l/devices.rst
> index aed0ce11d1f8..961e7fb62063 100644
> --- a/Documentation/media/uapi/v4l/devices.rst
> +++ b/Documentation/media/uapi/v4l/devices.rst
> @@ -24,3 +24,4 @@ Interfaces
> dev-sdr
> dev-event
> dev-subdev
> + dev-meta
> diff --git a/Documentation/media/uapi/v4l/vidioc-querycap.rst
> b/Documentation/media/uapi/v4l/vidioc-querycap.rst
> index b10fed313f99..734fae6fc5e4 100644
> --- a/Documentation/media/uapi/v4l/vidioc-querycap.rst
> +++ b/Documentation/media/uapi/v4l/vidioc-querycap.rst
> @@ -387,6 +387,14 @@ specification the ioctl returns an ``EINVAL`` error code.
>
> - .. row 23
>
> + - ``V4L2_CAP_META_CAPTURE``
> +
> + - 0x00800000
> +
> + - The device supports the :ref:`metadata` capture interface.
> +
> + - .. row 24
> +
> - ``V4L2_CAP_READWRITE``
>
> - 0x01000000
> @@ -394,7 +402,7 @@ specification the ioctl returns an ``EINVAL`` error code.
> - The device supports the :ref:`read() <rw>` and/or
> :ref:`write() <rw>` I/O methods.
>
> - - .. row 24
> + - .. row 25
>
> - ``V4L2_CAP_ASYNCIO``
>
> @@ -402,7 +410,7 @@ specification the ioctl returns an ``EINVAL`` error code.
>
> - The device supports the :ref:`asynchronous <async>` I/O methods.
>
> - - .. row 25
> + - .. row 26
>
> - ``V4L2_CAP_STREAMING``
>
> @@ -410,7 +418,7 @@ specification the ioctl returns an ``EINVAL`` error code.
>
> - The device supports the :ref:`streaming <mmap>` I/O method.
>
> - - .. row 26
> + - .. row 27
>
> - ``V4L2_CAP_DEVICE_CAPS``
>
> diff --git a/Documentation/media/videodev2.h.rst.exceptions
> b/Documentation/media/videodev2.h.rst.exceptions
> index 9bb9a6cc39d8..d1275725d367 100644
> --- a/Documentation/media/videodev2.h.rst.exceptions
> +++ b/Documentation/media/videodev2.h.rst.exceptions
> @@ -27,6 +27,7 @@ replace symbol V4L2_FIELD_SEQ_TB v4l2-field
> replace symbol V4L2_FIELD_TOP v4l2-field
>
> # Documented enum v4l2_buf_type
> +replace symbol V4L2_BUF_TYPE_META_CAPTURE v4l2-buf-type
> replace symbol V4L2_BUF_TYPE_SDR_CAPTURE v4l2-buf-type
> replace symbol V4L2_BUF_TYPE_SDR_OUTPUT v4l2-buf-type
> replace symbol V4L2_BUF_TYPE_SLICED_VBI_CAPTURE v4l2-buf-type
> @@ -148,6 +149,7 @@ replace define V4L2_CAP_MODULATOR device-capabilities
> 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
> diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> index bacecbd68a6d..da2d836e8887 100644
> --- 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(struct
> v4l2_sdr_format *kp, struct v4l2_sd
> 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 v4l2_format *kp,
> struct v4l2_format32 __us
> 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 v4l2_format *kp,
> struct v4l2_format32 __us
> 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);
> diff --git a/drivers/media/v4l2-core/v4l2-dev.c
> b/drivers/media/v4l2-core/v4l2-dev.c
> index e6da353b39bc..70af31210cd3 100644
> --- a/drivers/media/v4l2-core/v4l2-dev.c
> +++ b/drivers/media/v4l2-core/v4l2-dev.c
> @@ -574,30 +574,34 @@ static void determine_valid_ioctls(struct video_device
> *vdev)
> set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls);
>
> if (is_vid) {
> - /* 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)))
> @@ -663,7 +667,7 @@ static void determine_valid_ioctls(struct video_device
> *vdev)
> }
>
> if (is_vid || is_vbi || is_sdr) {
> - /* 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);
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c
> b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 51a0fa144392..1fce6b084b53 100644
> --- 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 *arg, bool
> write_only)
> 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 *arg, bool
> write_only)
> (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;
> }
> }
>
> @@ -981,6 +992,10 @@ static int check_fmt(struct file *file, enum
> v4l2_buf_type type)
> 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;
> }
> @@ -1349,6 +1364,11 @@ static int v4l_enum_fmt(const struct v4l2_ioctl_ops
> *ops,
> 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);
> @@ -1447,6 +1467,10 @@ static int v4l_g_fmt(const struct v4l2_ioctl_ops *ops,
> 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;
> }
> @@ -1534,6 +1558,11 @@ static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops,
> 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;
> }
> @@ -1618,6 +1647,11 @@ static int v4l_try_fmt(const struct v4l2_ioctl_ops
> *ops,
> 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;
> }
> diff --git a/drivers/media/v4l2-core/videobuf2-v4l2.c
> b/drivers/media/v4l2-core/videobuf2-v4l2.c
> index 9cfbb6e4bc28..7216668d1056 100644
> --- a/drivers/media/v4l2-core/videobuf2-v4l2.c
> +++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
> @@ -575,6 +575,9 @@ int vb2_create_bufs(struct vb2_queue *q, struct
> v4l2_create_buffers *create)
> 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;
> }
> diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
> index 8b1d19bc9b0e..a32dcf78d4a3 100644
> --- 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
> @@ -304,6 +313,8 @@ 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,
> @@ -330,6 +341,8 @@ 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,
> @@ -356,6 +369,8 @@ 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,
> @@ -382,6 +397,8 @@ 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, struct
> v4l2_requestbuffers *b);
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 724f43e69d03..e0afe68f24ee 100644
> --- 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,
> };
> @@ -435,6 +436,7 @@ 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 */
> @@ -2002,6 +2004,16 @@ 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
> @@ -2020,6 +2032,7 @@ 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;
> };
>
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