| .. -*- coding: utf-8; mode: rst -*- |
| |
| .. _V4L2-PIX-FMT-M420: |
| |
| ************************** |
| V4L2_PIX_FMT_M420 ('M420') |
| ************************** |
| |
| *man V4L2_PIX_FMT_M420(2)* |
| |
| 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. |
| |
| |
| |
| .. tabularcolumns:: |p{5.8cm}|p{2.9cm}|p{2.9cm}|p{2.9cm}|p{3.0cm}| |
| |
| .. 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: |
| |
| - 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 |