1 .. SPDX-License-Identifier: GFDL-1.1-no-invari 1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
2 2
3 .. _common: 3 .. _common:
4 4
5 ################### 5 ###################
6 Common API Elements 6 Common API Elements
7 ################### 7 ###################
8 Programming a V4L2 device consists of these st 8 Programming a V4L2 device consists of these steps:
9 9
10 - Opening the device 10 - Opening the device
11 11
12 - Changing device properties, selecting a vid 12 - Changing device properties, selecting a video and audio input, video
13 standard, picture brightness a. o. 13 standard, picture brightness a. o.
14 14
15 - Negotiating a data format 15 - Negotiating a data format
16 16
17 - Negotiating an input/output method 17 - Negotiating an input/output method
18 18
19 - The actual input/output loop 19 - The actual input/output loop
20 20
21 - Closing the device 21 - Closing the device
22 22
23 In practice most steps are optional and can be 23 In practice most steps are optional and can be executed out of order. It
24 depends on the V4L2 device type, you can read 24 depends on the V4L2 device type, you can read about the details in
25 :ref:`devices`. In this chapter we will discus 25 :ref:`devices`. In this chapter we will discuss the basic concepts
26 applicable to all devices. 26 applicable to all devices.
27 27
28 28
29 .. toctree:: 29 .. toctree::
30 :maxdepth: 1 30 :maxdepth: 1
31 31
32 open 32 open
33 querycap 33 querycap
34 app-pri 34 app-pri
35 video 35 video
36 audio 36 audio
37 tuner 37 tuner
38 standard 38 standard
39 dv-timings 39 dv-timings
40 control 40 control
41 extended-controls 41 extended-controls
42 ext-ctrls-camera 42 ext-ctrls-camera
43 ext-ctrls-flash 43 ext-ctrls-flash
44 ext-ctrls-image-source 44 ext-ctrls-image-source
45 ext-ctrls-image-process 45 ext-ctrls-image-process
46 ext-ctrls-codec 46 ext-ctrls-codec
47 ext-ctrls-codec-stateless 47 ext-ctrls-codec-stateless
48 ext-ctrls-jpeg 48 ext-ctrls-jpeg
49 ext-ctrls-dv 49 ext-ctrls-dv
50 ext-ctrls-rf-tuner 50 ext-ctrls-rf-tuner
51 ext-ctrls-fm-tx 51 ext-ctrls-fm-tx
52 ext-ctrls-fm-rx 52 ext-ctrls-fm-rx
53 ext-ctrls-detect 53 ext-ctrls-detect
54 ext-ctrls-colorimetry 54 ext-ctrls-colorimetry
55 fourcc 55 fourcc
56 format 56 format
57 planar-apis 57 planar-apis
58 selection-api 58 selection-api
59 crop 59 crop
60 streaming-par 60 streaming-par
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