chromaprint-wasm

WASM bindings for rusty-chromaprint. Uses preset test2 (AcoustID/fpcalc compatible).

Build

# Install wasm-pack if needed: cargo install wasm-pack
wasm-pack build --target web
# Or for Node: wasm-pack build --target nodejs

Output in pkg/: .wasm, .js glue, and (with wasm-pack) TypeScript definitions.

API (from JS)

• new Fingerprinter() – create a fingerprinter

• .start(sampleRate, channels) – e.g. 44100, 1 or 2

• .consume(samples) – samples is an Int16Array (interleaved if stereo)

• .finish() – call when all samples have been fed

• .getFingerprint() – returns Uint32Array (raw)

• .getCompressedFingerprint() – returns base64 string (AcoustID format)

• fingerprintFromSamples(sampleRate, channels, samples) – one-shot; returns { raw: Uint32Array, compressed: string }

• matchFingerprints(raw1, raw2) – both Uint32Array; returns array of { start1, end1, start2, end2, duration, score } (times in seconds)

Audio input

Decode in the browser (e.g. decodeAudioData), get channel data as Float32, convert to i16 (e.g. samples[i] = Math.max(-32768, Math.min(32767, channelData[i] * 32768))), then pass as Int16Array to consume() or fingerprintFromSamples.