On 1/23/21 6:56 AM, Laurent Pinchart wrote:
> Hi Helen,
>
> Thank you for the patch.
>
> On Fri, Jan 22, 2021 at 03:27:23PM -0300, Helen Koike wrote:
>> YUV 4:4:4 is not subsampled, fix this in the docs.
>>
>> Fixes: da785536e007 ("media: doc: pixfmt-yuv: Move all semi-planar YUV
>> formats to common file")
>> Signed-off-by: Helen Koike <helen.ko...@collabora.com>
>> ---
>> Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
>> b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
>> index 7d4d39201a3f..bcb4ef24c334 100644
>> --- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
>> +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
>> @@ -396,8 +396,8 @@ number of lines as the luma plane.
>> NV24 and NV42
>> -------------
>>
>> -Semi-planar YUV 4:4:4 formats. The chroma plane is subsampled by 2 in the
>> -horizontal direction. Chroma lines contain half the number of pixels and the
>> +Semi-planar YUV 4:4:4 formats. No sub-sampling.
>
> "The chroma plane is not subsampled." ?
Ack.
>
>> +Chroma lines contain the same number of pixels and the
>> same number of bytes as luma lines, and the chroma plane contains the same
>> number of lines as the luma plane.
>
> That's not quite right, the chroma lines contain twice the number of
> pixels and bytes, as there's one Cb and one Cr value in the chroma line
> for each Y value in the luma line.
>
>
> Maybe the text could be reflowed ?
>
Ack.
I'll submit v2 updating the text.
Thanks,
Helen
