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5377d91f MH |
1 | .. -*- coding: utf-8; mode: rst -*- |
2 | ||
3 | .. _V4L2-PIX-FMT-Y12I: | |
4 | ||
5 | ************************** | |
6 | V4L2_PIX_FMT_Y12I ('Y12I') | |
7 | ************************** | |
8 | ||
9 | *man V4L2_PIX_FMT_Y12I(2)* | |
10 | ||
11 | Interleaved grey-scale image, e.g. from a stereo-pair | |
12 | ||
13 | ||
14 | Description | |
15 | =========== | |
16 | ||
17 | This is a grey-scale image with a depth of 12 bits per pixel, but with | |
18 | pixels from 2 sources interleaved and bit-packed. Each pixel is stored | |
19 | in a 24-bit word in the little-endian order. On a little-endian machine | |
20 | these pixels can be deinterlaced using | |
21 | ||
5377d91f MH |
22 | .. code-block:: c |
23 | ||
24 | __u8 *buf; | |
25 | left0 = 0xfff & *(__u16 *)buf; | |
26 | right0 = *(__u16 *)(buf + 1) >> 4; | |
27 | ||
28 | **Bit-packed representation.** | |
5377d91f MH |
29 | pixels cross the byte boundary and have a ratio of 3 bytes for each |
30 | interleaved pixel. | |
31 | ||
5377d91f MH |
32 | .. flat-table:: |
33 | :header-rows: 0 | |
34 | :stub-columns: 0 | |
35 | :widths: 2 1 1 | |
36 | ||
37 | ||
38 | - .. row 1 | |
39 | ||
40 | - Y'\ :sub:`0left[7:0]` | |
41 | ||
42 | - Y'\ :sub:`0right[3:0]`\ Y'\ :sub:`0left[11:8]` | |
43 | ||
44 | - Y'\ :sub:`0right[11:4]` |