@resequence/web-au-utils

Shared utilities for pitch conversion, MIDI parsing, slide scheduling, and WAV encoding. Used across unit implementations and the rendering pipeline.

npm install @resequence/web-au-utils

Pitch

import { pitchToMidi } from "@resequence/web-au-utils";

const { note, cents } = pitchToMidi(pitch);

Converts a Pitch object to a MIDI note number with cents offset.

MIDI Import

Parse Standard MIDI Files into NoteEvent arrays.

import { parseMidiFile, CC } from "@resequence/web-au-utils";

const events = parseMidiFile(midiBytes);

Converts tempo maps, CC values (volume, pan, sustain, cutoff, resonance, chorus, reverb), and pitch bends into NoteEvent properties. The CC object provides named constants for standard MIDI controller numbers.

Slide Scheduling

import { scheduleSlideRamps } from "@resequence/web-au-utils";

scheduleSlideRamps(oscNode.frequency, baseFrequency, noteEvent.slides, startTime, transformer);

Schedules pitch bend ramps on an AudioParam from a note's slide data.

WAV Encoding

import { encodeWav } from "@resequence/web-au-utils";

const wavBytes = encodeWav(audioBuffer, { bitDepth: "24" });

Encodes an AudioBuffer to WAV. Supports 16, 24, 32, 32f, and 64-bit depths.