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Add bounded FLAC Wasm encoding and async streaming decoding - #2
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Adds
@misofm/codecwith incremental FLAC encoding and asynchronous streaming decoding, built with Bun and Effect v4 around pinned libFLAC 1.5.0 Wasm. The decoder emits metadata, bounded packed PCM, and a verified completion event, providing the codec boundary needed for a later engine-web-adapter migration.Encoding uses level 8 without exhaustive model search and a caller-owned random-access sink. Decoding suspends for asynchronous input within a frame, observes downstream backpressure, and uses fixed 2 MiB Wasm memory. Portable assets and Node/Bun loading Layers ship in the package.
Validation includes native libFLAC oracles, corruption/fragmentation/cancellation and allocator tests, byte-for-byte Wasm rebuilds, and fresh packed consumers on Bun, Node, Chromium, Firefox, and WebKit for both advertised Effect peers. The server benchmark covers all 137 chunks across 30 stems with three serial warm rounds and exact PCM verification; detailed receipts and review evidence are recorded in issue #1's spec.
The final server run produced 425,689,892 FLAC bytes versus native’s 425,690,361 bytes. Median encoding time was 60.580 seconds for Wasm versus 15.554 seconds native (3.895×); all PCM hashes matched. The receipt documents a brief packed-test overlap in warm round 1.
Adapter, CLI, and transcoder integration remain separate changes. This PR does not publish an npm release.
Closes #1