ouestlabs/audio-ui @audio-ui/core@0.3.0 on GitHub

85fd7b8: New @audio-ui/core/midi entry: MIDI with no framework in it. parseMidiMessage reads note on and off, control change and pitch bend with their channel and values from 0 to 1 (pitch bend from -1 to 1, both ends reached); parseMidiFile reads a Standard MIDI File into notes with their track, tempos and time signatures, and encodeMidiFile writes one; createMidiInput listens to the Web MIDI inputs of the page as one source. A file that is truncated, malformed or counts time in SMPTE frames raises a MidiFileError that says what is wrong. The folders of the package now tell the two kinds of module apart: primitives/ holds the logic of the interface primitives and audio/ the audio logic with no interface (pitch, midi).
43f455f: New @audio-ui/core/pitch entry: the maths of pitch with no framework or Web Audio in it. noteToFrequency and frequencyToNote convert between MIDI notes and hertz (equal temperament, A4 at 440 Hz or the reference you pass, fractional notes for cents), nearestNote names the note nearest a frequency with its offset in cents, and detectPitch finds the fundamental of an array of samples, such as an analyser's time-domain data, with the YIN algorithm. pitchName, isBlackKey and the new pitchClassName come with it. Input that is not a number a note or a frequency can be (zero, negative, NaN) gives NaN or null, never a wrong note.