summaryrefslogtreecommitdiff
path: root/Documentation/media/uapi/v4l/pixfmt-yuv422p.rst
blob: 9f34762adf1801483b6b10a5387ecc50a87c9ccb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
.. -*- coding: utf-8; mode: rst -*-

.. _V4L2-PIX-FMT-YUV422P:

*****************************
V4L2_PIX_FMT_YUV422P ('422P')
*****************************

*man V4L2_PIX_FMT_YUV422P(2)*

Format with ½ horizontal chroma resolution, also known as YUV 4:2:2.
Planar layout as opposed to ``V4L2_PIX_FMT_YUYV``


Description
===========

This format is not commonly used. This is a planar version of the YUYV
format. The three components are separated into three sub-images or
planes. The Y plane is first. The Y plane has one byte per pixel. The Cb
plane immediately follows the Y plane in memory. The Cb plane is half
the width of the Y plane (and of the image). Each Cb belongs to two
pixels. For example, Cb\ :sub:`0` belongs to Y'\ :sub:`00`,
Y'\ :sub:`01`. Following the Cb plane is the Cr plane, just like the Cb
plane.

If the Y plane has pad bytes after each row, then the Cr and Cb planes
have half as many pad bytes after their rows. In other words, two Cx
rows (including padding) is exactly as long as one Y row (including
padding).

**Byte Order.**
Each cell is one byte.



.. flat-table::
    :header-rows:  0
    :stub-columns: 0
    :widths:       2 1 1 1 1


    -  .. row 1

       -  start + 0:

       -  Y'\ :sub:`00`

       -  Y'\ :sub:`01`

       -  Y'\ :sub:`02`

       -  Y'\ :sub:`03`

    -  .. row 2

       -  start + 4:

       -  Y'\ :sub:`10`

       -  Y'\ :sub:`11`

       -  Y'\ :sub:`12`

       -  Y'\ :sub:`13`

    -  .. row 3

       -  start + 8:

       -  Y'\ :sub:`20`

       -  Y'\ :sub:`21`

       -  Y'\ :sub:`22`

       -  Y'\ :sub:`23`

    -  .. row 4

       -  start + 12:

       -  Y'\ :sub:`30`

       -  Y'\ :sub:`31`

       -  Y'\ :sub:`32`

       -  Y'\ :sub:`33`

    -  .. row 5

       -  start + 16:

       -  Cb\ :sub:`00`

       -  Cb\ :sub:`01`

    -  .. row 6

       -  start + 18:

       -  Cb\ :sub:`10`

       -  Cb\ :sub:`11`

    -  .. row 7

       -  start + 20:

       -  Cb\ :sub:`20`

       -  Cb\ :sub:`21`

    -  .. row 8

       -  start + 22:

       -  Cb\ :sub:`30`

       -  Cb\ :sub:`31`

    -  .. row 9

       -  start + 24:

       -  Cr\ :sub:`00`

       -  Cr\ :sub:`01`

    -  .. row 10

       -  start + 26:

       -  Cr\ :sub:`10`

       -  Cr\ :sub:`11`

    -  .. row 11

       -  start + 28:

       -  Cr\ :sub:`20`

       -  Cr\ :sub:`21`

    -  .. row 12

       -  start + 30:

       -  Cr\ :sub:`30`

       -  Cr\ :sub:`31`


**Color Sample Location..**



.. flat-table::
    :header-rows:  0
    :stub-columns: 0


    -  .. row 1

       -
       -  0

       -
       -  1

       -  2

       -
       -  3

    -  .. row 2

       -  0

       -  Y

       -  C

       -  Y

       -  Y

       -  C

       -  Y

    -  .. row 3

       -  1

       -  Y

       -  C

       -  Y

       -  Y

       -  C

       -  Y

    -  .. row 4

       -  2

       -  Y

       -  C

       -  Y

       -  Y

       -  C

       -  Y

    -  .. row 5

       -  3

       -  Y

       -  C

       -  Y

       -  Y

       -  C

       -  Y