#linux-rockchip on 2024-05-14 — irc logs at libera.irclog.whitequark.org

2023-07-10 07:36 mmind00 changed the topic of #linux-rockchip to: Rockchip development discussion | public log at https://libera.irclog.whitequark.org/linux-rockchip

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05:05 <valpackett> urja: yes. https://wiki.pine64.org/wiki/Mainline_Hardware_Decoding plumb into firefox… difficult? unfortunately there's the whole vaapi vs v4l2 mess and apparently no one wants to maintain the bridge? https://github.com/advancel/libva-v4l2-request-mainline seems to be an attempt to get it running again in modern times

05:06 <valpackett> oh actually firefox supports v4l2 since https://bugzilla.mozilla.org/show_bug.cgi?id=1833354

05:06 <valpackett> i hope it's the right kind of v4l2?

05:17 <CounterPillow> it's not

05:18 <CounterPillow> m2m is stateful, v4l2-requests is stateless

05:40 <valpackett> requests is *also m2m*, heh https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/dev-stateless-decoder.html but i guess the stateful one has 'm2m' naming in.. lots of places

05:42 <valpackett> anyway it's all handled in ffmpeg so i guess https://phabricator.services.mozilla.com/D178763 here the only hardcoded thing is the `h264_v4l2m2m` name

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05:43 <CounterPillow> Yes, and in ffmpeg terminology, v4l2m2m is the stateful interface, not the stateless one.

05:45 <valpackett> tbh it feels silly that ffmpeg does seem to have an abstraction over most of the differences between even wildly different acceleration backends and yet firefox has to support each particular one

05:46 <valpackett> outside of the codec name it only has different receive callbacks for v4l2m2m vs vaapi

05:46 <CounterPillow> they can't easily be abstracted over into one unified hardware decoding primitive because it bleeds into pixel formats and with that into what the output format of the client application will be

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