Documentation/userspace-api/media/v4l/common.rst

Source file repositories/reference/linux-study-clean/Documentation/userspace-api/media/v4l/common.rst

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Linux kernel
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Documentation/userspace-api/media/v4l/common.rst
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.rst
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1234 bytes
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62
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Support Tooling And Documentation
Bucket
Documentation
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Support Tooling And Documentation: documentation
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atlas-only

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Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: V4L

.. _common:

###################
Common API Elements
###################
Programming a V4L2 device consists of these steps:

-  Opening the device

-  Changing device properties, selecting a video and audio input, video
   standard, picture brightness a. o.

-  Negotiating a data format

-  Negotiating an input/output method

-  The actual input/output loop

-  Closing the device

In practice most steps are optional and can be executed out of order. It
depends on the V4L2 device type, you can read about the details in
:ref:`devices`. In this chapter we will discuss the basic concepts
applicable to all devices.


.. toctree::
    :maxdepth: 1

    open
    querycap
    app-pri
    video
    audio
    tuner
    standard
    dv-timings
    control
    extended-controls
    ext-ctrls-camera
    ext-ctrls-flash
    ext-ctrls-image-source
    ext-ctrls-image-process
    ext-ctrls-codec
    ext-ctrls-codec-stateless
    ext-ctrls-jpeg
    ext-ctrls-dv
    ext-ctrls-rf-tuner
    ext-ctrls-fm-tx
    ext-ctrls-fm-rx
    ext-ctrls-detect
    ext-ctrls-colorimetry
    fourcc
    format
    planar-apis
    selection-api
    crop
    streaming-par

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