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media: v4l: Add definition for the Sunxi tiled NV12 format

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This introduces support for the Sunxi tiled NV12 format, where each
component of the YUV frame is divided into macroblocks. Hence, the size
of each plane requires specific alignment. The pixels inside each
macroblock are coded in linear order (line after line from top to
bottom).

This tiled NV12 format is used by the video engine on Allwinner
platforms: it is the default format for decoded frames (and the only
one available in the oldest supported platforms).

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Paul Kocialkowski
2018-09-13 10:51:53 -04:00
committed by Mauro Carvalho Chehab
parent c27bb30e7b
commit 36cf35b786
3 changed files with 15 additions and 0 deletions
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13
Documentation/media/uapi/v4l/pixfmt-reserved.rst
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@@ -243,7 +243,20 @@ please make a proposal on the linux-media mailing list.
It is an opaque intermediate format and the MDP hardware must be
used to convert ``V4L2_PIX_FMT_MT21C`` to ``V4L2_PIX_FMT_NV12M``,
``V4L2_PIX_FMT_YUV420M`` or ``V4L2_PIX_FMT_YVU420``.
* .. _V4L2-PIX-FMT-SUNXI-TILED-NV12:
- ``V4L2_PIX_FMT_SUNXI_TILED_NV12``
- 'ST12'
- Two-planar NV12-based format used by the video engine found on Allwinner
(codenamed sunxi) platforms, with 32x32 tiles for the luminance plane
and 32x64 tiles for the chrominance plane. The data in each tile is
stored in linear order, within the tile bounds. Each tile follows the
previous one linearly in memory (from left to right, top to bottom).
The associated buffer dimensions are aligned to match an integer number
of tiles, resulting in 32-aligned resolutions for the luminance plane
and 16-aligned resolutions for the chrominance plane (with 2x2
subsampling).
.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|