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purescript-basic-pitch: FFI bindings to @spotify/basic-pitch (polyphonic chord transcription)
commit9d9d8c7a0057abcbe7dc2380d33c24ef6940698a authorMark <mark.eibes@gmail.com> dateSat 30 May 2026, 21:52 (4 months ago)
10 files changed+2302
compare with main
unifiedsplit
.gitignore+11 README.md+18 bun.lock+155 package.json+9 spago.lock+1770 spago.yaml+24 src/BasicPitch.js+59 src/BasicPitch.purs+178 test/Test/Main.js+23 test/Test/Main.purs+55
.gitignorenew file+11
@@ -0,0 +1,11 @@
1+bower_components/
2+node_modules/
3+output/
4+output-es/
5+generated-docs/
6+.psc-package/
7+.psc*
8+.purs*
9+.psa*
10+.spago
11+.spec-results
README.mdnew file+18
@@ -0,0 +1,18 @@
1+# purescript-basic-pitch
2+
3+PureScript FFI bindings to [`@spotify/basic-pitch`](https://github.com/spotify/basic-pitch-ts) — a small TensorFlow.js model that transcribes audio into polyphonic note events (a whole chord at once, unlike monophonic pitch detection).
4+
5+```purescript
6+model <- loadModel (ModelPath "/model/model.json") -- once
7+notes <- transcribe defaultOptions model samples -- per recorded burst
8+chord = pitches notes -- :: Array MidiPitch
9+```
10+
11+`samples` must be MONO `Float32Array` at `sampleRate` (22050 Hz). basic-pitch
12+processes a 2-second window, so feed it a recorded burst — resample mic audio to
13+`sampleRate` first.
14+
15+```bash
16+bun install
17+spago test
18+```
bun.locknew file+155
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package.jsonnew file+9
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1+{
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9+}
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1730+ "typelevel-prelude": {
1731+ "type": "registry",
1732+ "version": "7.0.0",
1733+ "integrity": "sha256-+pHi14/40mTj/+lmCWqL0T7iXIXD1+NSg/KItyyoB0A=",
1734+ "dependencies": [
1735+ "prelude",
1736+ "type-equality"
1737+ ]
1738+ },
1739+ "uint": {
1740+ "type": "registry",
1741+ "version": "7.0.0",
1742+ "integrity": "sha256-MCTYyDPFLoNLweSY1oEjKKo0xhqCGrAbiBQNdva1B3w=",
1743+ "dependencies": [
1744+ "enums",
1745+ "gen",
1746+ "maybe",
1747+ "numbers",
1748+ "prelude"
1749+ ]
1750+ },
1751+ "unfoldable": {
1752+ "type": "registry",
1753+ "version": "6.0.0",
1754+ "integrity": "sha256-BK/6By1sKp/ztk+9CF3q43SV0QDTLVdsGqFerKHSmbg=",
1755+ "dependencies": [
1756+ "foldable-traversable",
1757+ "maybe",
1758+ "partial",
1759+ "prelude",
1760+ "tuples"
1761+ ]
1762+ },
1763+ "unsafe-coerce": {
1764+ "type": "registry",
1765+ "version": "6.0.0",
1766+ "integrity": "sha256-0L1QsaY20OILjfU5TV72d3U/tSjhmL9hJ32WMp857Lk=",
1767+ "dependencies": []
1768+ }
1769+ }
1770+}
spago.yamlnew file+24
@@ -0,0 +1,24 @@
1+package:
2+ name: basic-pitch
3+ dependencies:
4+ - aff
5+ - arraybuffer-types
6+ - arrays
7+ - effect
8+ - functions
9+ - js-promise
10+ - js-promise-aff
11+ - newtype
12+ - prelude
13+ test:
14+ main: Test.Main
15+ dependencies:
16+ - arraybuffer
17+ - integers
18+ - numbers
19+ - spec
20+ - spec-node
21+workspace:
22+ packageSet:
23+ registry: 77.4.0
24+ extraPackages: {}
src/BasicPitch.jsnew file+59
@@ -0,0 +1,59 @@
1+import { BasicPitch, outputToNotesPoly, noteFramesToTime } from "@spotify/basic-pitch";
2+
3+export const loadModelImpl = (modelPath) => new BasicPitch(modelPath);
4+
5+export const fromGraphModelImpl = (graphModelPromise) =>
6+ new BasicPitch(graphModelPromise);
7+
8+// Run the model over one buffer of mono 22050 Hz samples, accumulating the
9+// frame/onset/contour activation matrices it streams out per 2-second window,
10+// then resolve with them collected. evaluateModel returns a Promise, so we
11+// hand back the resolved accumulator as the Aff's value.
12+export const evaluateImpl = (model, samples) =>
13+ new Promise((resolve, reject) => {
14+ const frames = [];
15+ const onsets = [];
16+ const contours = [];
17+ model
18+ .evaluateModel(
19+ samples,
20+ (f, o, c) => {
21+ frames.push(...f);
22+ onsets.push(...o);
23+ contours.push(...c);
24+ },
25+ () => {},
26+ )
27+ .then(() => resolve({ frames, onsets, contours }))
28+ .catch(reject);
29+ });
30+
31+// Turn the raw activation matrices into discrete note events, then stamp each
32+// with wall-clock start/duration. Options carry the detection thresholds.
33+export const toNotesImpl = (activations, options) => {
34+ const notes = outputToNotesPoly(
35+ activations.frames,
36+ activations.onsets,
37+ options.onsetThreshold,
38+ options.frameThreshold,
39+ options.minNoteLength,
40+ options.inferOnsets,
41+ options.maxFrequency,
42+ options.minFrequency,
43+ options.melodiaTrick,
44+ options.energyTolerance,
45+ );
46+ return noteFramesToTime(notes).map((n) => ({
47+ pitchMidi: n.pitchMidi,
48+ amplitude: n.amplitude,
49+ startTimeSeconds: n.startTimeSeconds,
50+ durationSeconds: n.durationSeconds,
51+ }));
52+};
53+
54+export const sampleRate = 22050;
55+
56+export const withDefaultsImpl = (defaults, partial) => ({
57+ ...defaults,
58+ ...partial,
59+});
src/BasicPitch.pursnew file+178
@@ -0,0 +1,178 @@
1+module BasicPitch
2+ ( Model
3+ , GraphModel
4+ , ModelPath(..)
5+ , Activations
6+ , NoteEvent
7+ , MidiPitch(..)
8+ , Amplitude(..)
9+ , Seconds(..)
10+ , Options
11+ , defaultOptions
12+ , OnsetThreshold(..)
13+ , FrameThreshold(..)
14+ , MinNoteFrames(..)
15+ , loadModel
16+ , fromGraphModel
17+ , evaluate
18+ , toNotes
19+ , transcribe
20+ , pitches
21+ , sampleRate
22+ ) where
23+
24+import Prelude
25+
26+import Data.Array (nub, sort)
27+import Data.ArrayBuffer.Types (Float32Array)
28+import Data.Function.Uncurried (Fn2, runFn2)
29+import Data.Newtype (class Newtype)
30+import Effect (Effect)
31+import Effect.Aff (Aff)
32+import Effect.Class (liftEffect)
33+import Effect.Uncurried (EffectFn1, EffectFn2, runEffectFn1, runEffectFn2)
34+import Prim.Row (class Union)
35+import Promise (Promise)
36+import Promise.Aff (toAffE)
37+
38+-- | A loaded basic-pitch model (a TensorFlow.js graph model under the hood).
39+foreign import data Model :: Type
40+
41+-- | A raw TensorFlow.js `GraphModel`, for callers who load/cache the weights
42+-- | themselves (e.g. a custom IO handler) and wrap them with `fromGraphModel`.
43+foreign import data GraphModel :: Type
44+
45+-- | Where to load the model's `model.json` from — a URL the TF.js loader
46+-- | accepts (an http(s) URL in the browser, or a `file://` URL in Node/Bun).
47+newtype ModelPath = ModelPath String
48+
49+derive instance Newtype ModelPath _
50+derive newtype instance Eq ModelPath
51+derive newtype instance Show ModelPath
52+
53+-- | The raw per-frame activation matrices the model streams out: note
54+-- | presence (`frames`), note attacks (`onsets`) and pitch contours. Feed
55+-- | these to `toNotes` to get discrete events.
56+foreign import data Activations :: Type
57+
58+-- | A note the model heard: which pitch, how loud, and when.
59+type NoteEvent =
60+ { pitchMidi :: MidiPitch
61+ , amplitude :: Amplitude
62+ , startTimeSeconds :: Seconds
63+ , durationSeconds :: Seconds
64+ }
65+
66+-- | A MIDI note number (A4 = 69).
67+newtype MidiPitch = MidiPitch Int
68+
69+derive instance Newtype MidiPitch _
70+derive newtype instance Eq MidiPitch
71+derive newtype instance Ord MidiPitch
72+derive newtype instance Show MidiPitch
73+
74+-- | A note's loudness, 0.0–1.0.
75+newtype Amplitude = Amplitude Number
76+
77+derive instance Newtype Amplitude _
78+derive newtype instance Eq Amplitude
79+derive newtype instance Ord Amplitude
80+derive newtype instance Show Amplitude
81+
82+-- | A duration or offset in seconds.
83+newtype Seconds = Seconds Number
84+
85+derive instance Newtype Seconds _
86+derive newtype instance Eq Seconds
87+derive newtype instance Ord Seconds
88+derive newtype instance Show Seconds
89+
90+-- | Minimum onset-strength for a note to start (0.0–1.0, higher = stricter).
91+newtype OnsetThreshold = OnsetThreshold Number
92+
93+derive instance Newtype OnsetThreshold _
94+derive newtype instance Eq OnsetThreshold
95+derive newtype instance Show OnsetThreshold
96+
97+-- | Minimum frame-strength for a note to continue (0.0–1.0).
98+newtype FrameThreshold = FrameThreshold Number
99+
100+derive instance Newtype FrameThreshold _
101+derive newtype instance Eq FrameThreshold
102+derive newtype instance Show FrameThreshold
103+
104+-- | Shortest note to keep, in model frames (~11.6 ms each).
105+newtype MinNoteFrames = MinNoteFrames Int
106+
107+derive instance Newtype MinNoteFrames _
108+derive newtype instance Eq MinNoteFrames
109+derive newtype instance Show MinNoteFrames
110+
111+-- | The note-extraction knobs `toNotes` passes to `outputToNotesPoly`. All
112+-- | optional via `defaultOptions`; the defaults mirror basic-pitch's own.
113+type Options =
114+ ( onsetThreshold :: OnsetThreshold
115+ , frameThreshold :: FrameThreshold
116+ , minNoteLength :: MinNoteFrames
117+ )
118+
119+defaultOptions :: { | Options }
120+defaultOptions =
121+ { onsetThreshold: OnsetThreshold 0.5
122+ , frameThreshold: FrameThreshold 0.3
123+ , minNoteLength: MinNoteFrames 5
124+ }
125+
126+-- | Load a model once and reuse it for every `evaluate`.
127+loadModel :: ModelPath -> Effect Model
128+loadModel = runEffectFn1 loadModelImpl
129+
130+foreign import loadModelImpl :: EffectFn1 ModelPath Model
131+
132+-- | Wrap an already-loaded TF.js `GraphModel` (resolved from a Promise) as a
133+-- | basic-pitch `Model` — for preloaded/cached weights or a custom IO handler.
134+fromGraphModel :: Promise GraphModel -> Effect Model
135+fromGraphModel = runEffectFn1 fromGraphModelImpl
136+
137+foreign import fromGraphModelImpl :: EffectFn1 (Promise GraphModel) Model
138+
139+-- | Run the model over one buffer of MONO samples at `sampleRate` (22050 Hz).
140+-- | basic-pitch processes a 2-second window, so feed it a recorded burst —
141+-- | resample mic audio to `sampleRate` first. Resolves once the whole buffer
142+-- | has been transcribed.
143+evaluate :: Model -> Float32Array -> Aff Activations
144+evaluate model samples = toAffE (runEffectFn2 evaluateImpl model samples)
145+
146+foreign import evaluateImpl :: EffectFn2 Model Float32Array (Promise Activations)
147+
148+-- | Reduce raw activations to discrete note events using the given thresholds.
149+toNotes :: forall p r. Union p r Options => { | p } -> Activations -> Effect (Array NoteEvent)
150+toNotes options activations =
151+ runEffectFn2 toNotesImpl activations (withDefaults defaultOptions options)
152+
153+foreign import toNotesImpl :: EffectFn2 Activations FullOptions (Array NoteEvent)
154+
155+-- | Evaluate then extract notes in one step (the common case).
156+transcribe :: forall p r. Union p r Options => { | p } -> Model -> Float32Array -> Aff (Array NoteEvent)
157+transcribe options model samples = do
158+ activations <- evaluate model samples
159+ toNotes options activations # liftEffect
160+
161+-- | The distinct MIDI pitches in a set of note events, sorted — i.e. the chord.
162+pitches :: Array NoteEvent -> Array MidiPitch
163+pitches = nub <<< sort <<< map _.pitchMidi
164+
165+-- | The sample rate basic-pitch expects, in hertz. Resample your mic audio to
166+-- | this before calling `evaluate`.
167+foreign import sampleRate :: Int
168+
169+-- A fully-populated options record, after defaults fill the absent fields. The
170+-- JS spread in `withDefaults` produces exactly the row basic-pitch wants.
171+type FullOptions = { | Options }
172+
173+-- | Fill the fields a caller omitted from their partial options with the
174+-- | defaults, via a JS object spread (the single-`Union` `Record.merge` can't).
175+withDefaults :: forall p r. Union p r Options => { | Options } -> { | p } -> FullOptions
176+withDefaults = runFn2 withDefaultsImpl
177+
178+foreign import withDefaultsImpl :: forall p. Fn2 FullOptions { | p } FullOptions
test/Test/Main.jsnew file+23
@@ -0,0 +1,23 @@
1+import * as tf from "@tensorflow/tfjs";
2+import { createRequire } from "module";
3+import fs from "fs";
4+import path from "path";
5+
6+// Load the model that ships inside @spotify/basic-pitch straight off disk into
7+// a TF.js GraphModel. Node's fetch can't read file:// URLs (the browser path
8+// the library normally takes), so the test hands the weights in via memory.
9+const require = createRequire(import.meta.url);
10+
11+export const loadGraphFromDisk = () => {
12+ const modelJsonPath = require.resolve("@spotify/basic-pitch/model/model.json");
13+ const dir = path.dirname(modelJsonPath);
14+ const spec = JSON.parse(fs.readFileSync(modelJsonPath, "utf8"));
15+ const manifest = spec.weightsManifest[0];
16+ const bin = fs.readFileSync(path.join(dir, manifest.paths[0]));
17+ const handler = tf.io.fromMemory({
18+ modelTopology: spec.modelTopology,
19+ weightSpecs: manifest.weights,
20+ weightData: bin.buffer.slice(bin.byteOffset, bin.byteOffset + bin.byteLength),
21+ });
22+ return tf.loadGraphModel(handler);
23+};
test/Test/Main.pursnew file+55
@@ -0,0 +1,55 @@
1+module Test.Main where
2+
3+import Prelude
4+
5+import BasicPitch (Amplitude(..), GraphModel, MidiPitch(..), NoteEvent, defaultOptions, fromGraphModel, pitches, sampleRate, transcribe)
6+import Data.Array (all, length, (..))
7+import Data.ArrayBuffer.Typed (fromArray)
8+import Data.ArrayBuffer.Types (Float32Array)
9+import Data.Float32 (fromNumber')
10+import Data.Int (toNumber)
11+import Data.Newtype (un)
12+import Data.Number (pi, sin)
13+import Effect (Effect)
14+import Effect.Aff (Aff)
15+import Effect.Class (liftEffect)
16+import Promise (Promise)
17+import Test.Spec (describe, it)
18+import Test.Spec.Assertions (shouldEqual, shouldSatisfy)
19+import Test.Spec.Reporter.Console (consoleReporter)
20+import Test.Spec.Runner.Node (runSpecAndExitProcess)
21+
22+main :: Effect Unit
23+main = runSpecAndExitProcess [ consoleReporter ] do
24+ describe "BasicPitch" do
25+ it "exposes the model's 22050 Hz sample rate" do
26+ sampleRate `shouldEqual` 22050
27+ it "transcribes a C major triad to the chord [C4, E4, G4]" do
28+ notes <- transcribeTriad
29+ pitches notes `shouldEqual` map MidiPitch [ 60, 64, 67 ]
30+ it "gives every note a positive amplitude" do
31+ notes <- transcribeTriad
32+ length notes `shouldSatisfy` (_ >= 3)
33+ all loud notes `shouldEqual` true
34+
35+loud :: NoteEvent -> Boolean
36+loud note = un Amplitude note.amplitude > 0.0
37+
38+transcribeTriad :: Aff (Array NoteEvent)
39+transcribeTriad = do
40+ model <- (loadGraphFromDisk >>= fromGraphModel) # liftEffect
41+ samples <- triadSamples # liftEffect
42+ transcribe defaultOptions model samples
43+
44+-- | Two seconds of a synthesised C major triad (C4 + E4 + G4) at the model's
45+-- | sample rate — the headless stand-in for someone playing the chord.
46+triadSamples :: Effect Float32Array
47+triadSamples = fromArray (map mix (0 .. (sampleCount - 1)))
48+ where
49+ mix i = fromNumber' ((tone 261.63 i + tone 329.63 i + tone 392.0 i) / 3.0 * 0.8)
50+ tone frequency i = sin (2.0 * pi * frequency * toNumber i / toNumber sampleRate)
51+
52+sampleCount :: Int
53+sampleCount = sampleRate * 2
54+
55+foreign import loadGraphFromDisk :: Effect (Promise GraphModel)