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BRINGUP: record the VPU JPEG offload path for the camera stream

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ScottW514
2026-08-03 13:18:19 -04:00
parent 82d5911a0e
commit 44137ae650
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@@ -172,7 +172,18 @@ core). Run by hand: `/usr/bin/forgectrl >> /data/forgectrl.log 2>&1 &`
**LightBurn consumes the stream directly — operator-verified
2026-08-03** ("without issue", via the mjpg-streamer-compatible
`/?action=stream` alias) while jogging the machine from the same
LightBurn session. Not yet done: lens calibration / bed alignment (the
LightBurn session.
Frame-rate ceiling and the offload path: 3.2 fps is CPU-bound in the
JPEG encode (single A9, libjpeg-turbo NEON). The hardware answer is the
**CODA960 VPU JPEG encoder — already probed with firmware on the image,
registered at /dev/video0** (V4L2 mem2mem, YUV input): demosaic the 2×2
superpixels straight to YUV420 on the CPU (cheap) and let the VPU
encode → est. 8–15 fps, likely CSI/memory-bound. The IPU cannot help
with demosaic (its IC is CSC/scale only, YUV/RGB in — that is the
`imx-csc-scaler` at /dev/video8, useful only for a future full-res
stream). Contained follow-up in forgectrl cam.c; keep the libjpeg path
as fallback. Not yet done: lens calibration / bed alignment (the
fisheye needs LightBurn's camera calibration pass), and the deferred
5.6 emulator homing-image smoke (the cloud emulator can now be pointed
at live snapshots).