[Bug 790115] New SMPTE 2086 meta API for partially supporting HDR

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790115

Arnaud Vrac <rawoul at gmail.com> changed:

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                 CC|                            |rawoul at gmail.com

--- Comment #7 from Arnaud Vrac <rawoul at gmail.com> ---
I think the proposed patches look good, thanks for this !

In the meta I would avoid the RGB prefix for primaries, and instead use a
generic array like ffmpeg does. This would avoid mistakes where the primaries
are not R, G, B. For example in HEVC, the  Mastering display colour volume SEI
spec mentions:

"For describing mastering displays that use red, green and blue colour
primaries,  it is suggested that index value c equal to 0 should correspond to
the green primary, c equal to 1 should correspond to the blue primary and c
equal to 2 should correspond to the red colour primary."

Also, do you have any plan to also handle the Content Light Level data
(AV_PKT_DATA_CONTENT_LIGHT_LEVEL side data) ? This is also very useful for HDR.

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