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Captures frames from a V4L2 camera and publishes them as std/media/v1/Image:
an Arrow struct of width, height, encoding and data, so a receiver needs
nothing from the message metadata. For a compressed encoding the recorded
dimensions are the image's, not the length of the payload.

Based on opencv-video-capture from dora-hub, with three changes. The output is
the typed image struct rather than a flat UInt8 buffer plus metadata. Camera
selection by id reads /dev/v4l/by-id/ only; the upstream macOS system_profiler
and Windows PowerShell enumeration is not carried. CAPTURE_FRAMES bounds a run
so a test ends on its own, in place of upstream's ten-second CI cutoff -- a
timeout would have made the CI step exit non-zero.

CI=true keeps a failed capture from raising, publishing a labelled black frame
instead, which is what lets dataflow.yml run on a machine with no camera.

Two dataflows, run one at a time, as dora has no cross-dataflow wiring:
dataflow.yml is the camera alone and the CI gate; dataflow_view.yml wires it
into dora-image-view and is not run by CI, since it fetches that node over the
network and needs a tag to exist there.

2026-09-15 06:04:25 -03:00

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AGENTS.md

Rules for AI coding assistants working in this repository.

dora >= 1.0. Verified against dora-cli 1.0.1, which CI pins in .gitea/workflows/validate.yml.
uv for everything: uv sync --group dev, uv run pytest, uv run ruff check ., uv run python .... Never pip into the ambient environment.
ruff is the linter and the formatter. uv run ruff check . must be clean.
Markdown is linted too. uv run pymarkdown scan *.md must be clean. Its line length is set in pyproject.toml.
numpy-style docstrings.
Dependencies must ship prebuilt wheels for linux-x86_64, linux-aarch64 and macos-arm64. uv sync is the whole install: no system packages, no compiler.
Run the workflow locally with act before asking for a commit. It lives in .gitea/workflows/, which is not where act looks by default:
```
act pull_request -W .gitea/workflows/validate.yml \
    -P ubuntu-latest=catthehacker/ubuntu:act-latest
```
Do not commit or push. Leave changes in the working tree and wait to be asked.
Do not mention AI tools in commit messages or documentation.

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AGENTS.md

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