[FFmpeg-devel] [PATCH 1/5] lavu/pixfmt: add Y210/AYUV/Y410 pixel formats

[James Darnley]

On 2019-06-28 03:03, Hendrik Leppkes wrote:
> On Fri, Jun 28, 2019 at 1:26 AM James Darnley <james.darnley at gmail.com> wrote:
>>
>> On 2019-06-28 04:26, Linjie Fu wrote:
>>> Previously, media driver provided planar format(like 420 8 bit), but
>>> for HEVC Range Extension (422/444 8/10 bit), the decoded image is
>>> produced in packed format.
>>>
>>> Y210/AYUV/Y410 are packed formats which are needed in HEVC Rext decoding
>>> for both VAAPI and QSV:
>>>     - Y210: 422 10 BIT
>>>     - AYUV: 444  8 BIT
>>>     - Y410: 444 10 BIT
>>>
>>
>>
>> Why am I suspicious that at least one of those is a re-ordered v210?  I
>> seem to recall that we rejected adding v210 to this list.  Either they
>> don't belong in this list or they don't belong because libavcodec has a
>> proper decoder (at least for v210).
>>
> 
> They are not quite as bad as v210 (and not related).
> 
> Microsoft documents them here as the recommended formats to be used on Windows:
> https://docs.microsoft.com/en-us/windows/desktop/medfound/recommended-8-bit-yuv-formats-for-video-rendering#444-formats-32-bits-per-pixel
> https://docs.microsoft.com/en-us/windows/desktop/medfound/10-bit-and-16-bit-yuv-video-formats
> 
> - Hendrik

Okay y410 and y210 use the highest 10 bits in each 16-bit word.  I
apologise for jumping to that conclusion.


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