Environment preflight
The four browser invariants the decoder depends on. All must pass on the device you intend to scan with.
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Secure context
getUserMedia() and WASM streaming both require HTTPS or localhost
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WASM MIME type
Streaming compilation requires Content-Type: application/wasm
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Zero-copy worker transfer
Frame buffers must move to the worker without being cloned
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Camera device
At least one videoinput device must be enumerable