1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
2
3.. _common:
4
5###################
6Common API Elements
7###################
8Programming a V4L2 device consists of these steps:
9
10-  Opening the device
11
12-  Changing device properties, selecting a video and audio input, video
13   standard, picture brightness a. o.
14
15-  Negotiating a data format
16
17-  Negotiating an input/output method
18
19-  The actual input/output loop
20
21-  Closing the device
22
23In practice most steps are optional and can be executed out of order. It
24depends on the V4L2 device type, you can read about the details in
25:ref:`devices`. In this chapter we will discuss the basic concepts
26applicable to all devices.
27
28
29.. toctree::
30    :maxdepth: 1
31
32    open
33    querycap
34    app-pri
35    video
36    audio
37    tuner
38    standard
39    dv-timings
40    control
41    extended-controls
42    ext-ctrls-camera
43    ext-ctrls-flash
44    ext-ctrls-image-source
45    ext-ctrls-image-process
46    ext-ctrls-codec
47    ext-ctrls-jpeg
48    ext-ctrls-dv
49    ext-ctrls-rf-tuner
50    ext-ctrls-fm-tx
51    ext-ctrls-fm-rx
52    ext-ctrls-detect
53    fourcc
54    format
55    planar-apis
56    selection-api
57    crop
58    streaming-par
59