[FFmpeg-devel] [PATCH 1/2] lavu/pixfmt: add AYUV pixel format

[Paul B Mahol]

On 8/29/19, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
>
>
> Am 29.08.2019 um 03:34 schrieb Fu, Linjie <linjie.fu at intel.com>:
>
>>> -----Original Message-----
>>> From: ffmpeg-devel [mailto:ffmpeg-devel-bounces at ffmpeg.org] On Behalf
>>> Of Carl Eugen Hoyos
>>> Sent: Thursday, August 29, 2019 05:17
>>> To: FFmpeg development discussions and patches <ffmpeg-
>>> devel at ffmpeg.org>
>>> Subject: Re: [FFmpeg-devel] [PATCH 1/2] lavu/pixfmt: add AYUV pixel
>>> format
>>>
>>>>> Am Mi., 28. Aug. 2019 um 09:34 Uhr schrieb Fu, Linjie
>>>>> <linjie.fu at intel.com>:
>>>>>
>>>>> -----Original Message-----
>>>>> From: ffmpeg-devel [mailto:ffmpeg-devel-bounces at ffmpeg.org] On
>>> Behalf
>>>>> Of Carl Eugen Hoyos
>>>>> Sent: Wednesday, August 28, 2019 14:51
>>>>> To: FFmpeg development discussions and patches <ffmpeg-
>>>>> devel at ffmpeg.org>
>>>>> Subject: Re: [FFmpeg-devel] [PATCH 1/2] lavu/pixfmt: add AYUV pixel
>>> format
>>>>>
>>>>>
>>>>>
>>>>>> Am 28.08.2019 um 08:22 schrieb Linjie Fu <linjie.fu at intel.com>:
>>>>>>
>>>>>> Add support for packed 4:4:4 pixel format AYUV.
>>>>>>
>>>>>> It is the format that VAAPI/QSV uses when coping with 4:4:4
>>>>>> surfaces.
>>>>>
>>>>>> Alpha channel will be set to default value for HEVC REXT
>>>>>> hw decode.
>>>>>
>>>>> What is the „default value“?
>>>>
>>>> Default zero. (and it should be 255 for display)
>>>
>>> If this is not a bug in the driver, there is no alpha channel that can be
>>> used.
>>> Rename it to 0YUV and remove the alpha usage.
>>
>> From the pixel format level, adding AYUV format is for a more
>> fundamental/common usage.
>
> Yes, but the new pixel format will only be accepted if it is needed for
> hardware compatibility.
> If the hardware only supports 0YUV, it cannot be used to argue in favour of
> a new AYUV format.

Nope.
>
> Carl Eugen
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