[v2,0/2] CameraSensorHelper measurement tool and guide
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Message ID 20260810174611.2472046-1-john.cronin@opcenter.com
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John Cronin Aug. 10, 2026, 5:46 p.m. UTC 
Hi,

Thanks Laurent for the review of the v1 series, and for looping in
Barnabas and Stefan.

Changes since v1:

- Do not install the measurement script (developer tool only; run from
  the libcamera source tree). Dropped the utils/meson.build install_data
  rule and the libcamera-measure-analogue-gain rename.
- Documentation notes that the helper is not packaged and should be run
  as ./utils/measure-analogue-gain.py from a checkout.

On longer-term direction:

- camshark: happy to leave that for later if Stefan sees a fit for a
  plugin; this series keeps a small standalone utils script for now, as
  you suggested is fine for a first merge.
- Setting analogue gain through libcamera rather than v4l2-ctl: agreed
  that is nicer. Happy to revisit once Barnabas AGC rework exposes raw
  AnalogueGain for sensors without a helper (or with one). The current
  tool documents the v4l2-ctl path that works today for soft-ISP helper
  bring-up.

Patches below (v2).

Thanks,
John Cronin


John Cronin (2):
  utils: Add measure-analogue-gain helper
  Documentation: Add Camera Sensor Helper guide

 Documentation/guides/camera-sensor-helper.rst | 148 ++++++
 Documentation/index.rst                       |   1 +
 Documentation/meson.build                     |   1 +
 utils/measure-analogue-gain.py                | 466 ++++++++++++++++++
 4 files changed, 616 insertions(+)
 create mode 100644 Documentation/guides/camera-sensor-helper.rst
 create mode 100755 utils/measure-analogue-gain.py