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ribalda: <u>hverkuil</u>: Hello Hans! can I take care of pinchartl feedback for uvc compliance patches. At least the non vb2 helper ones
hverkuil: <u>ribalda</u>: sure, no problem.
ribalda: ok, uvcvideo: uvc_ctrl_is_accessible: check for INACTIVE and uvcvideo: improve error handling in uvc_query_ctrl()
hverkuil: To be honest, I haven't read his feedback, but just ping me if you need some input from me.
ribalda: okidoki.
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ismaell: anyone working on H264 support in UVC?
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paulk: isn't that working already?
<br> I'm pretty sure I've used h.264 from an uvc camera before
ismaell: hmm, maybe I have another problem then, it isn't even reporting the format on my camera and I'm pretty sure it supports h264
<br> <u>ioctl</u>: VIDIOC_ENUM_FMT Type: Video Capture
<br> [0]: 'YUYV' (YUYV 4:2:2) [1]: 'MJPG' (Motion-JPEG, compressed) [2]: 'NV12' (Y/CbCr 4:2:0)
<br> :/
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ribalda: <u>hverkuil</u>: just fyi I have uploaded https://patchwork.linuxtv.org/project/linux-media/list/?series=6289 I have modified a couple of patches but kept your name,please make sure I did not screwed it up. It is tested in my computer
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ndufresne: <u>ismael</u>: old C920 (before they dropped H264 support) was muxing the H264 data into a jpeg
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-: ndufresne hoping this was the same ismael despite the missing l
ismael: <u>ndufresne</u>: huh, so I need to add some hack to make it work?
<br> It's a Logitech BRIO 4K
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ismael: there's a whitepaper somewhere, I need to read it... but I didn't though there was any hacks involved :/
ndufresne: <u>ismael</u>: I never actually tried with a brio, in gst we have uvch264src, a bin that plugs uvch264mjpgdemux and do some UVC specific ioctl to get things right, but this is very old, I don't know if logitech have kept this way
ismael: ok, I need to dig deeper
<br> shouldn't this be handled by v4l2 though?
pinchartl: <u>ismael</u>: we scolded Logitech when they came up with the idea of embedding H.264 inside MJPEG
<br> it had no effect though
<br> I'm not thrilled on the idea of a MJPEG parser in kernelspace
<br> sounds like a candidate for libcamera, but I'm not sure I'd be thrilled either by the idea of adding support for H.264 in libcamera :-S
ismael: heh, it's probably because they want it to work on an unmodified proprietary driver on some other platform maybe
<br> but does it need to parse the stream?
pinchartl: that's exactly why, yes, it was a big hack to support windows
<br> the MS developers made it clear they wouldn't change anything in their driver
<br> and the spec had to work around that
<br> I would hardly call that a standard
<br> MS is (or at least was at that time) well known for such bullying behaviours
ismael: not surprising... I've had a similar experience with Blackberry, they won't modify their drivers even in presence of changes to a spec they don't control
<br> I can only imagine MS with it's size can do even worse damage
<br> it's sad that the hw vendors don't fight back
pinchartl: it was dirty
<br> I briefly participated in the USBIF working group in charge of the video specification
<br> through the Linux Foundation, which was a USB-IF member
<br> took only a few weeks for MS to lobby and get the Linux Foundation membership revoked
djrscally: Really? On what grounds was that?
ismael: wow
<br> that's an interesting story
pinchartl: on the grounds that the LF had no way to enforce the USB-IF membership requirements on its own members
<br> that's the excuse they found
djrscally: Well, that's just annoying
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ndufresne: <u>hverkuil</u>: ezequielg: looks like NXP new flags was read earing for issues in their driver, notably they are implementing stuff like the old Samsung MFC was doing back in 2011, perhaps they reused the OMX implementation
<br> they then hit the case of LAST flag not working (e.g. you failed to decode the last frame), and missed the we added EPIPE on DQBUF for that
<br> anyway, it's the result of a series of attempt from them to try and fix real issues, but didn't notice that some of these issues were covered
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ezequielg: <u>ndufresne</u>: I fully agree with your reply of dropping all that.
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