Is Apple TV 4K going to support HLG, and how does it currently handle HLG content?

App & System Services Hardware
oviano OP
Created Feb ’21
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[AVPlayer availableHDRModes] shows:

iPad Pro: HLG, HDR10, DV
Apple TV 4K: HDR10, DV

So at the moment I assume HLG content will not trigger HLG mode on the TV.

However when decoding HLG content on Apple TV, I can see that the CVPixelBuffer does contain image buffer attachments specifying the correct colour space and transfer characteristics for HLG.

So what does it currently do on Apple TV 4K with this content when using AVFoundation APIs such as AVSampleBufferDisplayLayer and AVPlayer etc? Does it tone map it to SDR? Convert to HDR10 somehow? Do nothing?
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Is Apple TV 4K going to support HLG, and how does it currently handle HLG content?
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