[FFmpeg-devel] [PATCH v4 2/2] avfilter: Add tonemap vaapi filter

[Carl Eugen Hoyos]

Am 23.10.2019 um 06:48 schrieb Xiang, Haihao <haihao.xiang at intel.com>:

>>> On 11/09/2019 06:39, Zachary Zhou wrote:
>>> It supports ICL platform.
>>> H2H (HDR to HDR): P010 -> A2R10G10B10
>>> H2S (HDR to SDR): P010 -> ARGB
>> 
>> The input format doesn't have any alpha so the output shouldn't either.  Not
>> sure what the first case wants, but the second should be AV_PIX_FMT_0RGB (or
>> some swizzle thereof).

> Usually the default alpha is taken as 1.0 when alpha is not specified, so how
> about setting alpha to 1.0 too when doing P010-> A2R10G10B10/ARGB in this
> filter? On the other hand, we need to send the output of tonemapping to HDR/SDR
> display and the HW supports A2R10G10B10/ARGB instead of 0R10G10B10/0RGB.

The HDR->SDR output should be 0RGB (or one of its friends), not ARGB.

Carl Eugen