Composite Video Device Abstraction for Libcamera
summary
Libcamera gains a C++ composite v4l2 video device that presents an ISP plus memory‑to‑memory postprocessors (dewarp, JPEG) as one video node, driving selection via a use‑case enum: video only, video+dewarp, video+JPEG or both. The class overrides V4L2 methods, orchestrates stream on/off across ISP/dewarp/JPEG, and handles intermediate buffer allocation (application buffers at pipeline end, intermediate buffers from the video buffer pool or dewarp buffer pool) and control routing so pipeline handlers don’t manage per‑device wiring.
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chapters (8)
- 0:00Introduction
- 0:21Problem statement and ISP overview
- 8:32Libcamera’s ISP simplification
- 11:51Pipeline handling choices
- 14:17Composite video abstraction design
- 18:08Initialization and use cases
- 21:28Buffer allocation in pipelines
- 25:52Performance and Q&A
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