Hi Michael, On Fri, 2023-08-04 at 20:45 +0200, Michael Riesch wrote: > Hi Gergő, > > Interesting work! I would guess that there are a lot of cameras with an > accelerometer or gyroscope that could report the rotation. > I think only the Streamcam in the UVC world, but who knows. :) > On 8/3/23 23:28, Gergő Köteles wrote: > > Hi, > > > > Logitech Streamcam can be mounted in 'portrait mode' as well. > > It reports the current roll (-90, 0, 90, 180) with > > UVC_CT_ROLL_ABSOLUTE_CONTROL. > > > > This RFC defines V4L2_CID_ROLL_ABSOLUTE, and maps > > UVC_CT_ROLL_ABSOLUTE_CONTROL to make it available to > > userspace. > > Then, the userspace can rotate the stream based on the roll. > > Should we also discuss pitch and yaw while we are at it? > They are there with V4L2_CID_PAN_ABSOLUTE and V4L2_CID_TILT_ABSOLUTE. > As far as I know there are controls to set pan and tilt of a PTZ camera, > but there are no controls that report those angles. > Aren't real PTZ cameras using the CT_PANTILT_ABSOLUTE_CONTROL for panning and tilting? Or just to move the crop window? > > Is it better to use V4L2_CID_CAMERA_SENSOR_ROTATION for this? > > IMHO that would make sense. > > Best regards, > Michael > > > The value set matches that control. > > If yes, is it worth mapping UVC_CT_ROLL_ABSOLUTE_CONTROL to > > V4L2_CID_CAMERA_SENSOR_ROTATION for this camera only? > > > > Any feedback is greately appreciated. > > > > > > Gergő Köteles (2): > > media: v4l2: ctrls: Add ROLL_ABSOLUTE control > > media: v4l2: map UVC_CT_ROLL_ABSOLUTE_CONTROL > > > > .../userspace-api/media/v4l/ext-ctrls-camera.rst | 5 +++++ > > drivers/media/usb/uvc/uvc_ctrl.c | 9 +++++++++ > > drivers/media/v4l2-core/v4l2-ctrls-defs.c | 1 + > > include/uapi/linux/v4l2-controls.h | 2 ++ > > 4 files changed, 17 insertions(+) > > > > > > base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
