summaryrefslogtreecommitdiff
path: root/Documentation/media/uapi/v4l/pixfmt-m420.rst
blob: f4a21a8a6dccf01d6820328c2cc6a58fa4a4e525 (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
.. -*- coding: utf-8; mode: rst -*-

.. _V4L2-PIX-FMT-M420:

**************************
V4L2_PIX_FMT_M420 ('M420')
**************************

Format with ½ horizontal and vertical chroma resolution, also known as
YUV 4:2:0. Hybrid plane line-interleaved layout.


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

M420 is a YUV format with ½ horizontal and vertical chroma subsampling
(YUV 4:2:0). Pixels are organized as interleaved luma and chroma planes.
Two lines of luma data are followed by one line of chroma data.

The luma plane has one byte per pixel. The chroma plane contains
interleaved CbCr pixels subsampled by ½ in the horizontal and vertical
directions. Each CbCr pair belongs to four pixels. For example,
Cb\ :sub:`0`/Cr\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`,
Y'\ :sub:`10`, Y'\ :sub:`11`.

All line lengths are identical: if the Y lines include pad bytes so do
the CbCr lines.

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


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


    -  .. 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:

       -  Cb\ :sub:`00`

       -  Cr\ :sub:`00`

       -  Cb\ :sub:`01`

       -  Cr\ :sub:`01`

    -  .. row 4

       -  start + 16:

       -  Y'\ :sub:`20`

       -  Y'\ :sub:`21`

       -  Y'\ :sub:`22`

       -  Y'\ :sub:`23`

    -  .. row 5

       -  start + 20:

       -  Y'\ :sub:`30`

       -  Y'\ :sub:`31`

       -  Y'\ :sub:`32`

       -  Y'\ :sub:`33`

    -  .. row 6

       -  start + 24:

       -  Cb\ :sub:`10`

       -  Cr\ :sub:`10`

       -  Cb\ :sub:`11`

       -  Cr\ :sub:`11`


**Color Sample Location..**



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


    -  .. row 1

       -
       -  0

       -
       -  1

       -  2

       -
       -  3

    -  .. row 2

       -  0

       -  Y

       -
       -  Y

       -  Y

       -
       -  Y

    -  .. row 3

       -
       -
       -  C

       -
       -
       -  C

       -

    -  .. row 4

       -  1

       -  Y

       -
       -  Y

       -  Y

       -
       -  Y

    -  .. row 5

       -

    -  .. row 6

       -  2

       -  Y

       -
       -  Y

       -  Y

       -
       -  Y

    -  .. row 7

       -
       -
       -  C

       -
       -
       -  C

       -

    -  .. row 8

       -  3

       -  Y

       -
       -  Y

       -  Y

       -
       -  Y