V4L2 Controls - From Perspective of Video Capture Devices
Talkat Embedded Linux Conference @ Open Source Summit North America 2022 · on Friday, 2022-06-24· at 14:00· Griffin Hall (Level 2), JW Marriott Austin, 110 E 2nd Street Austin, TX 78701·
summary
Implements MIPI CSI‑2 capture pipeline with two sensors, a serializer and deserializer and a host CSI‑2 RX, exposing V4L2 controls for sensor parameters and stream-level settings. Adds custom control v4l2_ctrl_new_custom for number of lanes (1–4, step 1, default 1), uses v4l2_ctrl_handler_setup to initialize hardware defaults, supports control flags like disabled, grabbed, volatile and uses v4l2_ctrl_notify so inherited subdevice changes propagate to the bridge. Uses v4l2-ctl for enumeration and get/set; integration works in the sample device.
AI-written summary · about
chapters (10)
- 0:00Start
- 1:00Agenda
- 2:29Structure of V4 L2 Framework
- 5:10Block Diagram for the Sample System
- 6:12Why Controls Are Needed
- 8:47Extended Controls for Camera
- 11:05Inheriting Controls
- 15:40Control Notification
- 25:11Sample Capture Device
- 31:49Steps for Adding the Control Handler to the Sample Capture Device
related talks
41mHow V4L2 Transformed To Support Embedded Cameras
36mCamera/ISP Drivers Using V4L2 Media Controller Framework
20mV4L2 Media Controller Request API
41mLearn How to Support Your SoC and ISP in Libcamera
25mLibcamera: Making Complex Cameras Easy
29mComposite Video Device Abstraction for Libcamera
39mSupporting the Camera Interface on the C.H.I.P
46mWhy Embedded Cameras are Difficult, and How to Make Them Easy