1 .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.
2
3 ========
4 Glossary
5 ========
6
7 .. note::
8
9 The goal of this section is to standardize
10 userspace API documentation. This is Work I
11
12 .. Please keep the glossary entries in alphabe
13
14 .. glossary::
15
16 Bridge Driver
17 A :term:`Device Driver` that implement
18 media hardware.
19
20 CEC API
21 **Consumer Electronics Control API**
22
23 An API designed to receive and transmi
24 CEC interface.
25
26 See :ref:`cec`.
27
28 Data Unit
29
30 Unit of data transported by a bus. On
31 consists of one or more related sample
32 unit is logical. If the data unit is i
33 pixel.
34
35 Device Driver
36 Part of the Linux Kernel that implemen
37 component.
38
39 Device Node
40 A character device node in the file sy
41 transfer data in and out of a Kernel d
42
43 Digital TV API
44 **Previously known as DVB API**
45
46 An API designed to control a subset of
47 that implements digital TV (e. g. DVB,
48
49 See :ref:`dvbapi`.
50
51 DSP
52 **Digital Signal Processor**
53
54 A specialized :term:`Microprocessor`,
55 optimized for the operational needs of
56
57 FPGA
58 **Field-programmable Gate Array**
59
60 An :term:`IC` circuit designed to be c
61 a designer after manufacturing.
62
63 See https://en.wikipedia.org/wiki/Fiel
64
65 Hardware Component
66 A subset of the :term:`Media Hardware`
67 :term:`SPI` device, or an :term:`IP Bl
68 :term:`SoC` or :term:`FPGA`.
69
70 Hardware Peripheral
71 A group of :term:`hardware components
72 together make a larger user-facing fun
73 instance, the :term:`SoC` :term:`ISP`
74 and the external camera sensors togeth
75 peripheral.
76
77 Also known as :term:`Peripheral`.
78
79 I²C
80 **Inter-Integrated Circuit**
81
82 A multi-master, multi-slave, packet s
83 serial computer bus used to control so
84 like sub-device hardware components.
85
86 See http://www.nxp.com/docs/en/user-gu
87
88 IC
89 **Integrated circuit**
90
91 A set of electronic circuits on one sm
92 semiconductor material, normally silic
93
94 Also known as chip.
95
96 IP Block
97 **Intellectual property core**
98
99 In electronic design a semiconductor i
100 is a reusable unit of logic, cell, or
101 design that is the intellectual proper
102 IP Blocks may be licensed to another p
103 and used by a single party alone.
104
105 See https://en.wikipedia.org/wiki/Semi
106
107 ISP
108 **Image Signal Processor**
109
110 A specialized processor that implement
111 processing image data. ISPs may implem
112 shading correction, demosaicing, scali
113 as well as produce statistics for the
114 algorithms (e.g. automatic exposure, w
115
116 Media API
117 A set of userspace APIs used to contro
118 composed by:
119
120 - :term:`CEC API`;
121 - :term:`Digital TV API`;
122 - :term:`MC API`;
123 - :term:`RC API`; and
124 - :term:`V4L2 API`.
125
126 See Documentation/userspace-api/media/
127
128 MC API
129 **Media Controller API**
130
131 An API designed to expose and control
132 multimedia devices and sub-devices.
133
134 See :ref:`media_controller`.
135
136 MC-centric
137 :term:`V4L2 Hardware` device driver th
138
139 Such drivers have ``V4L2_CAP_IO_MC`` d
140 (see :ref:`VIDIOC_QUERYCAP`).
141
142 See :ref:`v4l2_hardware_control` for m
143
144 Media Hardware
145 Subset of the hardware that is support
146
147 This includes audio and video capture
148 digital and analog TV, camera sensors,
149 codecs, HDMI Consumer Electronics Cont
150
151 Microprocessor
152 Electronic circuitry that carries out
153 computer program by performing the bas
154 control and input/output (I/O) operati
155 instructions on a single integrated ci
156
157 Peripheral
158 The same as :term:`Hardware Peripheral
159
160 RC API
161 **Remote Controller API**
162
163 An API designed to receive and transmi
164 controllers.
165
166 See :ref:`remote_controllers`.
167
168 SMBus
169 A subset of I²C, which defines a stri
170
171 SPI
172 **Serial Peripheral Interface Bus**
173
174 Synchronous serial communication inter
175 short distance communication, primaril
176
177 SoC
178 **System on a Chip**
179
180 An integrated circuit that integrates
181 or other electronic systems.
182
183 Stream
184 A distinct flow of data (image data or
185 to a final sink. The initial source ma
186 final sink e.g. a memory buffer.
187
188 V4L2 API
189 **V4L2 userspace API**
190
191 The userspace API defined in :ref:`v4l
192 control a V4L2 hardware.
193
194 V4L2 Device Node
195 A :term:`Device Node` that is associat
196
197 The V4L2 device node naming is specifi
198
199 V4L2 Hardware
200 Part of the media hardware which is su
201
202 V4L2 Sub-device
203 V4L2 hardware components that aren't c
204 :term:`Bridge Driver`. See :ref:`subde
205
206 Video-node-centric
207 V4L2 device driver that doesn't requir
208
209 Such drivers have the ``V4L2_CAP_IO_MC
210 (see :ref:`VIDIOC_QUERYCAP`).
211
212 V4L2 Sub-device API
213 Part of the :term:`V4L2 API` which con
214 :term:`V4L2 sub-devices <V4L2 Sub-devi
215 HDMI receivers, scalers, deinterlacers
216
217 See :ref:`v4l2_hardware_control` for m
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