open-standards/wai/score-conformance

Score Conformance Corpus

Vectors for the score extension (wai.audio.score). The criterion is mixdown-equivalence: given the same score, a conforming sink MUST render the identical canonical i16 PCM via the deterministic reference synth, hence the identical BLAKE3 — on every machine, no tolerance parameter. The music counterpart of spatial audio's mixdown-equivalence, with the recorded sound objects replaced by note events.

The reference synth is trig-free: a phase accumulator drives a piecewise-linear oscillator (saw / square / triangle / pulse) shaped by a linear ADSR envelope, all in the wai.det.fixed64 floor. Pitch is carried as a per-sample phase increment authored off-line, so the floor never evaluates an exponential. A sink with a soundfont or neural instrument renders the same score richly — that is presentation, not conformance.

Layout

• vectors/<name>.wscr — the WSCR container (contract + note events).
• expected_hashes.json — per score: notes, duration, score_hash (identity), and mixdown_hash (the conformance quantity).

Vectors:

• scale — a C-major scale ascending (saw).
• chord — a C-major triad held together (triangle, polyphony).
• arp — a four-step arpeggio that changes timbre across the phrase.

Running

cd ../wai-rs
cargo run --features score --bin wai_score_vectors -- verify ../score-conformance
cargo run --features score --bin wai_score_vectors -- gen    ../score-conformance   # regenerate

Pass = mixdown-hash and score-hash equality.