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.. -*- coding: utf-8; mode: rst -*-
.. _VIDIOC_DV_TIMINGS_CAP:
*********************************************************
ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP
*********************************************************
Name
====
VIDIOC_DV_TIMINGS_CAP - VIDIOC_SUBDEV_DV_TIMINGS_CAP - The capabilities of the Digital Video receiver/transmitter
Synopsis
========
.. cpp:function:: int ioctl( int fd, int request, struct v4l2_dv_timings_cap *argp )
Arguments
=========
``fd``
File descriptor returned by :ref:`open() <func-open>`.
``request``
VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP
``argp``
Description
===========
To query the capabilities of the DV receiver/transmitter applications
initialize the ``pad`` field to 0, zero the reserved array of struct
:ref:`v4l2_dv_timings_cap <v4l2-dv-timings-cap>` and call the
``VIDIOC_DV_TIMINGS_CAP`` ioctl on a video node and the driver will fill
in the structure.
.. note:: Drivers may return different values after
switching the video input or output.
When implemented by the driver DV capabilities of subdevices can be
queried by calling the ``VIDIOC_SUBDEV_DV_TIMINGS_CAP`` ioctl directly
on a subdevice node. The capabilities are specific to inputs (for DV
receivers) or outputs (for DV transmitters), applications must specify
the desired pad number in the struct
:ref:`v4l2_dv_timings_cap <v4l2-dv-timings-cap>` ``pad`` field and
zero the ``reserved`` array. Attempts to query capabilities on a pad
that doesn't support them will return an ``EINVAL`` error code.
.. _v4l2-bt-timings-cap:
.. flat-table:: struct v4l2_bt_timings_cap
:header-rows: 0
:stub-columns: 0
:widths: 1 1 2
- .. row 1
- __u32
- ``min_width``
- Minimum width of the active video in pixels.
- .. row 2
- __u32
- ``max_width``
- Maximum width of the active video in pixels.
- .. row 3
- __u32
- ``min_height``
- Minimum height of the active video in lines.
- .. row 4
- __u32
- ``max_height``
- Maximum height of the active video in lines.
- .. row 5
- __u64
- ``min_pixelclock``
- Minimum pixelclock frequency in Hz.
- .. row 6
- __u64
- ``max_pixelclock``
- Maximum pixelclock frequency in Hz.
- .. row 7
- __u32
- ``standards``
- The video standard(s) supported by the hardware. See
:ref:`dv-bt-standards` for a list of standards.
- .. row 8
- __u32
- ``capabilities``
- Several flags giving more information about the capabilities. See
:ref:`dv-bt-cap-capabilities` for a description of the flags.
- .. row 9
- __u32
- ``reserved``\ \[16\]
- Reserved for future extensions. Drivers must set the array to
zero.
.. _v4l2-dv-timings-cap:
.. flat-table:: struct v4l2_dv_timings_cap
:header-rows: 0
:stub-columns: 0
:widths: 1 1 2 1
- .. row 1
- __u32
- ``type``
- Type of DV timings as listed in :ref:`dv-timing-types`.
- .. row 2
- __u32
- ``pad``
- Pad number as reported by the media controller API. This field is
only used when operating on a subdevice node. When operating on a
video node applications must set this field to zero.
- .. row 3
- __u32
- ``reserved``\ \[2\]
- Reserved for future extensions. Drivers and applications must set
the array to zero.
- .. row 4
- union
-
-
- .. row 5
-
- struct :ref:`v4l2_bt_timings_cap <v4l2-bt-timings-cap>`
- ``bt``
- BT.656/1120 timings capabilities of the hardware.
- .. row 6
-
- __u32
- ``raw_data``\ \[32\]
-
.. _dv-bt-cap-capabilities:
.. flat-table:: DV BT Timing capabilities
:header-rows: 0
:stub-columns: 0
- .. row 1
- Flag
- Description
- .. row 2
-
-
- .. row 3
- ``V4L2_DV_BT_CAP_INTERLACED``
- Interlaced formats are supported.
- .. row 4
- ``V4L2_DV_BT_CAP_PROGRESSIVE``
- Progressive formats are supported.
- .. row 5
- ``V4L2_DV_BT_CAP_REDUCED_BLANKING``
- CVT/GTF specific: the timings can make use of reduced blanking
(CVT) or the 'Secondary GTF' curve (GTF).
- .. row 6
- ``V4L2_DV_BT_CAP_CUSTOM``
- Can support non-standard timings, i.e. timings not belonging to
the standards set in the ``standards`` field.
Return Value
============
On success 0 is returned, on error -1 and the ``errno`` variable is set
appropriately. The generic error codes are described at the
:ref:`Generic Error Codes <gen-errors>` chapter.
|
