README

These are built from source by scripts/build-ort-android.sh, not downloaded. Run that script to replace them; it pins the ONNX Runtime version, restricts the build to ../../moonshine-required-operators.config, and strips before vendoring.

Do not drop a stock ONNX Runtime AAR in here. Everything above the library assumes a minimal build: only ORT-format models load (docs/ort-only-models.md), and there is no NNAPI provider (docs/execution-providers.md).

What the operator-restricted build is worth, per ABI, against the stock 1.23.2 mobile libraries it replaced:

A device installs one ABI, so an arm64 phone sees 12.5 MB of that. Measure the result with scripts/measure-mobile-size.sh android, which reads the built AAR rather than these files, since Gradle repackages them.

An unstripped arm64 library is around 675 MB, of which 636 MB is .debug* sections Gradle discards at packaging. The build script strips with the NDK's own llvm-strip; check any replacement before committing it, because Git LFS will happily carry the debug info forever:

file <abi>/libonnxruntime.so   # expect "stripped"
strings -a <abi>/libonnxruntime.so | grep -o 'VERS_1\.[0-9.]*' | sort -u

Keep every ABI on the same ORT version, and on the same version as the other platforms; scripts/ort-build-common.sh holds the one that all three build scripts share.