Hi Dave,
Thanks for the set.
On Fri, Dec 20, 2024 at 04:21:13PM +0000, Dave Stevenson wrote:
> The Raspberry Pi HEVC decoder uses a tiled format based on
> columns for 8 and 10 bit YUV images, so document them as
> NV12MT_COL128 and NV12MT_10_COL128.
>
> Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
> ---
> .../userspace-api/media/v4l/pixfmt-yuv-planar.rst | 42 ++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
>
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> index b788f6933855..90414491d7b5 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> @@ -827,6 +827,48 @@ Data in the 12 high bits, zeros in the 4 low bits, arranged in little endian ord
> - Cb\ :sub:`11`
> - Cr\ :sub:`11`
>
> +NV12MT_COL128 and NV12MT_10_COL128
Please use full macro names of the formats here.
> +----------------------------------
> +
> +``V4L2_PIX_FMT_NV12MT_COL128`` is a tiled version of
> +``V4L2_PIX_FMT_NV12M`` where the two planes are split into 128 byte wide columns
> +of Y or interleaved CbCr.
> +
> +NV12MT_10_COL128 expands that as a 10 bit format where 3 10 bit values are
Ditto.
> +packed into a 32bit word. A 128 byte wide column therefore holds 96 samples
> +(either Y or interleaved CrCb). That effectively makes it 6 values in a 64 bit
> +word for the CbCr plane, as the values always go in pairs.
> +
> +Bit-packed representation.
> +
> +.. tabularcolumns:: |p{1.2cm}||p{1.2cm}||p{1.2cm}||p{1.2cm}|p{3.2cm}|p{3.2cm}|
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> + :widths: 8 8 8 8
> +
> + * - Y'\ :sub:`00[7:0]`
> + - Y'\ :sub:`01[5:0] (bits 7--2)` Y'\ :sub:`00[9:8]`\ (bits 1--0)
> + - Y'\ :sub:`02[3:0] (bits 7--4)` Y'\ :sub:`01[9:6]`\ (bits 3--0)
> + - unused (bits 7--6)` Y'\ :sub:`02[9:4]`\ (bits 5--0)
> +
> +.. tabularcolumns:: |p{1.2cm}||p{1.2cm}||p{1.2cm}||p{1.2cm}|p{3.2cm}|p{3.2cm}|
> +
> +.. flat-table::
> + :header-rows: 0
> + :stub-columns: 0
> + :widths: 12 12 12 12 12 12 12 12
> +
> + * - Cb\ :sub:`00[7:0]`
> + - Cr\ :sub:`00[5:0]`\ (bits 7--2) Cb\ :sub:`00[9:8]`\ (bits 1--0)
> + - Cb\ :sub:`01[3:0]`\ (bits 7--4) Cr\ :sub:`00[9:6]`\ (bits 3--0)
> + - unused (bits 7--6) Cb\ :sub:`02[9:4]`\ (bits 5--0)
> + - Cr\ :sub:`01[7:0]`
> + - Cb\ :sub:`02[5:0]`\ (bits 7--2) Cr\ :sub:`01[9:8]`\ (bits 1--0)
> + - Cr\ :sub:`02[3:0]`\ (bits 7--4) Cb\ :sub:`02[9:6]`\ (bits 3--0)
> + - unused (bits 7--6) Cr\ :sub:`02[9:4]`\ (bits 5--0)
> +
>
> Fully Planar YUV Formats
> ========================
>
--
Kind regards,
Sakari Ailus
