tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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-codec-stateless
48 ext-ctrls-jpeg
49 ext-ctrls-dv
50 ext-ctrls-rf-tuner
51 ext-ctrls-fm-tx
52 ext-ctrls-fm-rx
53 ext-ctrls-detect
54 ext-ctrls-colorimetry
55 fourcc
56 format
57 planar-apis
58 selection-api
59 crop
60 streaming-par