BasicPitch = import("https://cdn.skypack.dev/@spotify/basic-pitch@1.0.1?min")
BasicPitch
audioCtx = new AudioContext({
// This samplerate is required by basic-pitch
sampleRate: 22050
})
// Small workaround to make audioBuffer mutable in Observable
ab = {
return { audioBuffer: undefined };
}
// from here: https://github.com/spotify/basic-pitch-ts/tree/main/test_data
test_data_c_major = FileAttachment("test_data_C_major.mp3")
audioCtx.decodeAudioData(
// fs.readFileSync(/* Path to audio file */),
await test_data_c_major.arrayBuffer(),
async (_audioBuffer) => {
ab.audioBuffer = _audioBuffer;
},
() => {}
)
notes = {
while (ab === undefined || ab.audioBuffer === undefined) {
console.log("waiting for audio to load");
await new Promise((r) => setTimeout(r, 10));
}
const frames = [];
const onsets = [];
const contours = [];
let pct = 0;
const model = "https://unpkg.com/@spotify/basic-pitch@1.0.1/model/model.json";
const basicPitch = new BasicPitch.BasicPitch(model);
await basicPitch.evaluateModel(
ab.audioBuffer,
(f, o, c) => {
frames.push(...f);
onsets.push(...o);
contours.push(...c);
},
(p) => {
pct = p;
}
);
const notes = BasicPitch.noteFramesToTime(
BasicPitch.addPitchBendsToNoteEvents(
contours,
BasicPitch.outputToNotesPoly(frames, onsets, 0.25, 0.25, 5)
)
);
return notes;
}
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