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| wens | could someone merge the remaining media dt-binding patches in https://patchwork.linuxtv.org/project/linux-media/list/?series=13680 ? | [06:44] |
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| dcz_ | what does it mean for a video driver to be "video-node-centric"? I can't find a way to relate mbus formats to fourcc codes in that case, does it mean there will be no configurable link to the video device?
can I assume anything about the topology of such a media device or the existence of subdevices? are there any other such drivers apart from uvc? uvc seems to have a pretty rigid topology, is it the same as being video-node-centric? sorry for too many questions, I'm getting confused about the generality of the interace as I try to implement a userspace driver | [12:33] |
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| jmondi | dcz_: a "video-node centric" driver means that all the confgiguration and control of the camera pipeline is performed on a single video device node (/dev/videoX) and the driver internally propagate the settings to other entities in the system. video-node centric drivers are sometimes (maybe unfairly) called "legacy" as they offer a simplified view of the system where none of the
subdevices part of the pipeline are exposed to userspace. It is not a suitable design for modern camera systems where multiple entities concur in realizing the capture pipeline (generally at least an image sensor, a csi-2 reciver, some form of ISP and dma engines) while it is valid (afaict) for USB cameras as all the image processing is performed on the camera module rather than being realized by a pipeline of processing blocks on the SoC | [13:19] |
| dcz_ | thanks, that's what I was missing. On the first read, it looked like it was just a single property that was affected | [13:22] |
| jmondi | I presume modern uvc cameras do anyway expose a media topology to allow enumerating the entities in the system, but they're anyway controlled by /dev/video0 only | [13:23] |
| dcz_ | what's the point of that? | [13:23] |
| jmondi | topology enumeration you mean ? | [13:23] |
| dcz_ | I have 3 entities but I haven't found a way to reference them directly
yes | [13:23] |
| jmondi | I'm abolutely not a uvc expert, but I presume modern webcam have additional features exposed as additional video devices/subdevices
you can have additional data streams like a point cloud to represent depth maps in examples, and I presume in UVC they get represented as additional video devices | [13:24] |
| dcz_ | I have one device with just metadata here | [13:26] |
| jmondi | but again, I know nothing about UVC so take this as my own understanding only | [13:26] |
| dcz_ | thanks
I have found some UVC ioctls for controls, but there doesn't seem to be a connection to specific entities (but I don't understand how to use them anyway) different question: does all this mean that a MC-centric driver will have a subdevice node for every entity, or I cannot make that assumption? | [13:26] |
| jmondi | dcz_: it really depends on the platform. Components in the system which needs to be configured with specific settings to realize a function should be exposed to userspace
but there's no requirement to have one subdev for each component of the pipeline if the component is pass-through or has unmodifiable settings I think (or simply the driver does not support those functions) (however in this case, my suggestion would be to expose the full topology from the very beginning so that userspace doesn't need to be completely rewritten when a new function/block is added to the driver) dcz_: and for controls (if you're talking about v4l2-controls) for video-centric drivers the controls of the internal entities are collected and exposed through the control handler of the video device | [13:28] |
| dcz_ | jmondi: I meant the special UVC controls that can be mapped to v4l2 controls https://www.kernel.org/doc/html/next/userspace-api/media/drivers/uvcvideo.html#introduction
I tried to run someone's software to take a look at this but didn't get anywhere | [13:33] |
| jmondi | sorry no idea, seems like a uvc specific feature | [13:34] |
| dcz_ | thanks for the explanations | [13:34] |
| jmondi | yw | [13:35] |
| dcz_ | it's awkward for the model I'm using to not be able to query some pads on the path, so knowing that I can't make assumptions here is useful | [13:35] |
| pinchartl | dcz_: the UVC video node exposes an ioctl to get/set controls on XUs. the media graph is there to allow enumerating the XUs
and what do you mean by "implement a userspace driver" ? | [13:40] |
| dcz_ | by analogy to mesa, there's the kernel driver and the user driver to every complex device
in libcamera they are called pipelines IIRC pinchartl: oh, now I vaguely recall, getting from the entity to the XU involved going through the USB /sys hierarchy | [13:42] |
| jmondi | maybe there's something I don't know about uvc, but does it require "a driver" since most of the image transform happen "magically" inside the camera itself ?
* "a -userspace- driver" (yes, we have a pipeline for uvc in libcamera, but offers nothing more than what an application could do by poking at /dev/video0 directly) | [13:49] |
| dcz_ | I think of a driver as something that abstracts a complex interface rather than offers more possibilities | [13:55] |
| jmondi | that's my point.. what's complex about UVC ? :)
(from a userspace perspective I mean) | [13:56] |
| dcz_ | nothing. it's having a unified interface across different things of the same type (cameras) that warrants a driver
otherwise, you can bang MMIO registers and never need a driver for anything | [13:57] |
| jmondi | eheh true that
ah well, if you're aiming at complex devices, having uvc as a bonus is perfectly fine | [13:58] |
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| PedroAmarante_ | Hey, anyone still talks here? | [21:46] |
| djrscally | Plenty | [21:52] |
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