[RPI] KMS related code maintenance

    Hello. KMS video acceleration and HDR passthrough is the heart of LibreElec. Is this code original and open source? Is it ever updated in features and maintained? I look at the nightly changelog but I don't find references. I see mesa driver updates.

    popcornmix says LE10/11/12 use the kms driver (kernel side). HiassofT says 4k60p uses direct-to-plane rendering.

    Is H264/H265 acceleration based on any existent library?

    For HDR10 passthrough, does it pass the content's mastering luminance along with maxcll and maxfall to a HDR10 layer for the HDMI display? Does LE check the display EDID luminance capability i.e. to ensure content is within it?

    Cannot answer all those questions but this may be of interest:

    Also, this post:

    Post

    RE: Explanation of the ffmpeg patches

    Great playback behaviour/performance with Kodi requires kernel, ffmpeg, and Kodi patches. The kernel patches are normally a mix of things that are already on upstream mailing lists and capabilities that are still work-in-progress. Over time LE accumulated several DRM maintainers and notable contributors as project staff, and we deliberately chat with folks from Collabora and Raspberry Pi who are involved with commercial work in the DRM/V4L2 ecosystem that overlaps with our needs: LE gains from…
    chewitt
    December 26, 2023 at 2:55 PM

    Edited 2 times, last by inspector71 (January 7, 2024 at 3:13 AM).