libcamerasrc / gstreamer plugin expose sensor-mode configuration

[Jacopo Mondi]

Hi Jeffrey

On Tue, Mar 04, 2025 at 12:08:46PM +0100, Jeffrey Katz wrote:
> Hi Jacopo & co,
>
> > True that's what rpicam-apps do, and you will probably be able to do the same
> > by enumerating the RAW modes. However you won't be able to test the frame
> > durations without configuring the camera, which I'm not sure it's something
> > that we want to be done in the "enumeration"
> > phase...
>
> I honestly see this as two separate functionalities:
>
> 1) Be able to specify, through some means, how the sensor should be accessed
> 2) Discovery of what exactly is possible with a given sensor
>
> As I understand the discussion so far, 2) is difficult because the kernel interfaces are not yet there, creating a chicken-and-egg problem. However, I still don't understand what is preventing 1) to be independently added. Especially in our case, we know in advance what exactly we want, we're just unable to specify it. If this means an intermediate period where the rpicam-apps have to be used to discover what to set, that's okay in my book. Especially as it doesn't change anything for existing users.

Nothing blocks 1) in my opinion if not implementing it.

But you should check with Nicolas if in gstreamer is fine to be able
to set properties that are not enumerated.

>
> -JK
>