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| Who | What | When |
|---|---|---|
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| pinchartl | hverkuil: ping | [09:11] |
| hverkuil | pinchartl: pong | [09:12] |
| pinchartl | what would you think about a VIDIOC_SUBDEV_S_STREAM ioctl ?
I suppose you'll first think you need some context :-) I have a camera pipeline | [09:13] |
| hverkuil | some context would be nice, yes :-) | [09:13] |
| pinchartl | there are camera modules made of a sensor and a serializer (GMSL or fpd-link, doesn't matter)
4x cameras connected to a receiver each receiver has 2 CSI-2 outputs so 4 CSI-2 links, connected to an SoC inside the SoC, each CSI-2 receiver outputs two streams (one per camera) there are thus 8 parallel streams internally going through processing and video encoding and the output of the 8 video encoders go to a network interface that then streams all that over IP there's no memory buffer in there (at least none that are accessible by the CPU), it's a full hardware pipeline, from the cameras to the ethernet cable MC + V4L2 subdev can model all that nicely (I dread the time when I'll submit new V4L2 controls to set the src and dst IP addresses of the network interface though...) but as there's no DMA engine, there's no video node and thus no place to call VIDIOC_STREAMON and VIDIOC_STREAMOFF conceptually speaking, I think streaming should be controlled from the output of the pipeline (if we had DMA engines instead of a network interface, that's where the video nodes would be) and the simplest solution is to have a stream control ioctl there, on the last subdev in the pipeline did I scare you ? :-) | [09:14] |
| hverkuil | I have no problem with this. Frankly, I've seen similar situations where I had to hack around this for a bit in order to make it work. If memory serves that is with pipelines where an HDMI receiver is connected to a SoC, and then everything disappears into a proprietary ISP black hole. But the HDMI receiver is still a proper driver that you want to control with V4L2, but without a V4L2 video device you need to somehow command it to
start streaming. | [09:21] |
| pinchartl | that's a bit more of a hack as the ISP should be controlled using V4L2
in my case, the new ioctl would only be exposed by the last subdev in the chain | [09:22] |
| hverkuil | Your case is a better argument for this, since it isn't a proprietary black hole, but a valid corner case. | [09:22] |
| pinchartl | which would call the .s_stream() subdev operation of all subdevs in the chain internally, exactly like a video node implementation would do
thanks for your feedback. I'll write an RFC and start prototyping | [09:23] |
| hverkuil | As long as it is clearly documented how it should be used (and perhaps even add a check in v4l2-compliance to verify that you don't support both VIDIOC_STREAMON and VIDIOC_SUBDEV_STREAMON so implementers don't do silly things), I am fine with this.
(and yes, I watch the evening ELC sessions life, and watch the night time session recordings the next day :-) ) | [09:24] |
| pinchartl | it would be opt-in for drivers, certainly
I'm technically registered to the conference, but didn't agree with the terms & conditions of the meeting play platform, so I can only watch talks that have been posted to youtube :-( I'm very disappointed by the Linux Foundation with this | [09:25] |
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| hverkuil | pinchartl: that was an excellent libcamera presentation! | [10:29] |
| pinchartl | thank you
it was much harder than I thought to record a video. presenting live is easier | [10:30] |
| hverkuil | and congratulations with all that you have achieved, quite impressive.
Hopefully next year it will be in person again. | [10:30] |
| pinchartl | we have much more work to do :-) | [10:33] |
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