160 lines
4.5 KiB
ReStructuredText
160 lines
4.5 KiB
ReStructuredText
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. c:namespace:: V4L
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.. _VIDIOC_DV_TIMINGS_CAP:
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*********************************************************
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ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP
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*********************************************************
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Name
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====
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VIDIOC_DV_TIMINGS_CAP - VIDIOC_SUBDEV_DV_TIMINGS_CAP - The capabilities of the Digital Video receiver/transmitter
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Synopsis
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========
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.. c:macro:: VIDIOC_DV_TIMINGS_CAP
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``int ioctl(int fd, VIDIOC_DV_TIMINGS_CAP, struct v4l2_dv_timings_cap *argp)``
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.. c:macro:: VIDIOC_SUBDEV_DV_TIMINGS_CAP
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``int ioctl(int fd, VIDIOC_SUBDEV_DV_TIMINGS_CAP, struct v4l2_dv_timings_cap *argp)``
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Arguments
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=========
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``fd``
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File descriptor returned by :c:func:`open()`.
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``argp``
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Pointer to struct :c:type:`v4l2_dv_timings_cap`.
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Description
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===========
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To query the capabilities of the DV receiver/transmitter applications
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initialize the ``pad`` field to 0, zero the reserved array of struct
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:c:type:`v4l2_dv_timings_cap` and call the
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``VIDIOC_DV_TIMINGS_CAP`` ioctl on a video node and the driver will fill
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in the structure.
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.. note::
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Drivers may return different values after
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switching the video input or output.
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When implemented by the driver DV capabilities of subdevices can be
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queried by calling the ``VIDIOC_SUBDEV_DV_TIMINGS_CAP`` ioctl directly
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on a subdevice node. The capabilities are specific to inputs (for DV
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receivers) or outputs (for DV transmitters), applications must specify
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the desired pad number in the struct
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:c:type:`v4l2_dv_timings_cap` ``pad`` field and
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zero the ``reserved`` array. Attempts to query capabilities on a pad
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that doesn't support them will return an ``EINVAL`` error code.
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.. tabularcolumns:: |p{1.2cm}|p{3.2cm}|p{12.9cm}|
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.. c:type:: v4l2_bt_timings_cap
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.. flat-table:: struct v4l2_bt_timings_cap
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:header-rows: 0
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:stub-columns: 0
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:widths: 1 1 2
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* - __u32
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- ``min_width``
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- Minimum width of the active video in pixels.
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* - __u32
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- ``max_width``
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- Maximum width of the active video in pixels.
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* - __u32
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- ``min_height``
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- Minimum height of the active video in lines.
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* - __u32
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- ``max_height``
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- Maximum height of the active video in lines.
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* - __u64
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- ``min_pixelclock``
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- Minimum pixelclock frequency in Hz.
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* - __u64
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- ``max_pixelclock``
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- Maximum pixelclock frequency in Hz.
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* - __u32
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- ``standards``
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- The video standard(s) supported by the hardware. See
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:ref:`dv-bt-standards` for a list of standards.
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* - __u32
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- ``capabilities``
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- Several flags giving more information about the capabilities. See
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:ref:`dv-bt-cap-capabilities` for a description of the flags.
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* - __u32
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- ``reserved``\ [16]
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- Reserved for future extensions.
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Drivers must set the array to zero.
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.. tabularcolumns:: |p{4.4cm}|p{3.6cm}|p{9.3cm}|
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.. c:type:: v4l2_dv_timings_cap
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.. flat-table:: struct v4l2_dv_timings_cap
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:header-rows: 0
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:stub-columns: 0
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:widths: 1 1 2
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* - __u32
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- ``type``
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- Type of DV timings as listed in :ref:`dv-timing-types`.
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* - __u32
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- ``pad``
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- Pad number as reported by the media controller API. This field is
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only used when operating on a subdevice node. When operating on a
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video node applications must set this field to zero.
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* - __u32
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- ``reserved``\ [2]
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- Reserved for future extensions.
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Drivers and applications must set the array to zero.
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* - union {
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- (anonymous)
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* - struct :c:type:`v4l2_bt_timings_cap`
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- ``bt``
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- BT.656/1120 timings capabilities of the hardware.
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* - __u32
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- ``raw_data``\ [32]
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* - }
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-
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.. tabularcolumns:: |p{7.2cm}|p{10.3cm}|
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.. _dv-bt-cap-capabilities:
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.. flat-table:: DV BT Timing capabilities
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:header-rows: 0
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:stub-columns: 0
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* - Flag
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- Description
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* -
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-
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* - ``V4L2_DV_BT_CAP_INTERLACED``
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- Interlaced formats are supported.
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* - ``V4L2_DV_BT_CAP_PROGRESSIVE``
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- Progressive formats are supported.
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* - ``V4L2_DV_BT_CAP_REDUCED_BLANKING``
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- CVT/GTF specific: the timings can make use of reduced blanking
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(CVT) or the 'Secondary GTF' curve (GTF).
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* - ``V4L2_DV_BT_CAP_CUSTOM``
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- Can support non-standard timings, i.e. timings not belonging to
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the standards set in the ``standards`` field.
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Return Value
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============
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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