1 .. SPDX-License-Identifier: GFDL-1.1-no-invari
2
3 .. _querycap:
4
5 *********************
6 Querying Capabilities
7 *********************
8
9 Because V4L2 covers a wide variety of devices
10 are equally applicable to all types of devices
11 the same type have different capabilities and
12 the omission of a few complicated and less imp
13
14 The :ref:`VIDIOC_QUERYCAP` ioctl is available
15 check if the kernel device is compatible with
16 query the :ref:`functions <devices>` and :ref:
17 supported by the device.
18
19 Starting with kernel version 3.1, :ref:`VIDIOC
20 will return the V4L2 API version used by the d
21 matches the Kernel version. There's no need of
22 :ref:`VIDIOC_QUERYCAP` to check if a specific
23 is supported, the V4L2 core now returns ``ENOT
24 provide support for an ioctl.
25
26 Other features can be queried by calling the r
27 example :ref:`VIDIOC_ENUMINPUT` to learn about
28 number, types and names of video connectors on
29 abstraction is a major objective of this API,
30 :ref:`VIDIOC_QUERYCAP` ioctl also allows drive
31 specific applications to reliably identify the
32
33 All V4L2 drivers must support :ref:`VIDIOC_QUE
34 Applications should always call this ioctl aft
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