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import API from "renderer/lib/api";
import trackerActions from "store/features/tracker/trackerActions";
import {
defaultMusicMidiState,
MusicMidiInputDevice,
MusicMidiState,
} from "shared/lib/music/midi";
const MIDI_ENABLED_SETTING_KEY = "midiInputEnabled";
const MIDI_DEVICE_ID_SETTING_KEY = "midiInputDeviceId";
const NOTE_ON_STATUS_MASK = 0xf0;
const NOTE_ON_STATUS = 0x90;
const NOTE_OFFSET = 48;
type MidiNoteListener = (note: number) => void;
type StoredMidiDevice = {
id: string | null;
name: string | null;
manufacturer: string | null;
};
interface MusicMidiControllerEnv {
supportsMidi: () => boolean;
requestAccess: () => Promise<MIDIAccess>;
getStoredEnabled: () => Promise<boolean>;
setStoredEnabled: (enabled: boolean) => Promise<void>;
getStoredDevice: () => Promise<StoredMidiDevice | null>;
setStoredDevice: (device: StoredMidiDevice | null) => Promise<void>;
}
type MusicMidiControllerStore = {
dispatch: (action: unknown) => unknown;
};
const defaultEnv: MusicMidiControllerEnv = {
supportsMidi: () => isMidiSupported(),
requestAccess: async () => {
const nav = navigator as Navigator & {
requestMIDIAccess?: () => Promise<MIDIAccess>;
};
Iif (typeof nav.requestMIDIAccess !== "function") {
throw new Error("Web MIDI API is not supported in this environment.");
}
return nav.requestMIDIAccess();
},
getStoredEnabled: async () =>
(await API.settings.get(MIDI_ENABLED_SETTING_KEY)) === true,
setStoredEnabled: async (enabled: boolean) => {
await API.settings.set(MIDI_ENABLED_SETTING_KEY, enabled);
},
getStoredDevice: async () => {
const value = await API.settings.get(MIDI_DEVICE_ID_SETTING_KEY);
Iif (typeof value === "string" && value.length > 0) {
try {
const parsed = JSON.parse(value) as Partial<StoredMidiDevice>;
Iif (parsed && typeof parsed === "object") {
const id =
typeof parsed.id === "string" && parsed.id.length > 0
? parsed.id
: null;
const name =
typeof parsed.name === "string" && parsed.name.length > 0
? parsed.name
: null;
const manufacturer =
typeof parsed.manufacturer === "string" &&
parsed.manufacturer.length > 0
? parsed.manufacturer
: null;
Iif (id || name || manufacturer) {
return {
id,
name,
manufacturer,
};
}
}
} catch {
// Legacy values were stored as raw device ids.
}
return {
id: value,
name: null,
manufacturer: null,
};
}
Iif (!value || typeof value !== "object") {
return null;
}
const device = value as Partial<StoredMidiDevice>;
const id =
typeof device.id === "string" && device.id.length > 0 ? device.id : null;
const name =
typeof device.name === "string" && device.name.length > 0
? device.name
: null;
const manufacturer =
typeof device.manufacturer === "string" && device.manufacturer.length > 0
? device.manufacturer
: null;
return id || name || manufacturer
? {
id,
name,
manufacturer,
}
: null;
},
setStoredDevice: async (device: StoredMidiDevice | null) => {
Iif (device && (device.id || device.name || device.manufacturer)) {
await API.settings.set(
MIDI_DEVICE_ID_SETTING_KEY,
JSON.stringify(device),
);
return;
}
await API.settings.delete(MIDI_DEVICE_ID_SETTING_KEY);
},
};
export const isMidiSupported = () => {
Iif (typeof navigator === "undefined") {
return false;
}
const nav = navigator as Navigator & {
requestMIDIAccess?: () => Promise<MIDIAccess>;
};
return typeof nav.requestMIDIAccess === "function";
};
const clampMidiNote = (note: number) =>
Math.max(0, Math.min(TOTAL_NOTES - 1, note));
const getMidiInputDevices = (midiAccess: MIDIAccess): MusicMidiInputDevice[] =>
Array.from(midiAccess.inputs.values()).map((input) => ({
id: input.id,
name: input.name?.trim() || input.id,
}));
const normalizeMidiValue = (value: string | null | undefined) =>
typeof value === "string" && value.trim().length > 0 ? value.trim() : null;
const toStoredMidiDevice = (
input: MIDIInput | null,
): StoredMidiDevice | null => {
Iif (!input) {
return null;
}
return {
id: normalizeMidiValue(input.id),
name: normalizeMidiValue(input.name),
manufacturer: normalizeMidiValue(input.manufacturer),
};
};
const isSameStoredMidiDevice = (
a: StoredMidiDevice | null,
b: StoredMidiDevice | null,
) =>
a?.id === b?.id && a?.name === b?.name && a?.manufacturer === b?.manufacturer;
const findBestMatchingInput = (
midiAccess: MIDIAccess,
stored: StoredMidiDevice | null,
): MIDIInput | null => {
const inputs = Array.from(midiAccess.inputs.values());
if (!stored) {
return null;
}
return (
(stored.id ? inputs.find((input) => input.id === stored.id) : undefined) ||
inputs.find(
(input) =>
normalizeMidiValue(input.name) === stored.name &&
normalizeMidiValue(input.manufacturer) === stored.manufacturer,
) ||
(stored.name
? inputs.find((input) => normalizeMidiValue(input.name) === stored.name)
: undefined) ||
null
);
};
export const getMidiNoteFromMessage = (
data: Uint8Array | readonly number[],
): number | null => {
Iif (data.length < 3) {
return null;
}
const [status, note, velocity] = data;
if ((status & NOTE_ON_STATUS_MASK) !== NOTE_ON_STATUS || velocity === 0) {
return null;
}
return clampMidiNote(note - NOTE_OFFSET);
};
class MusicMidiController {
private readonly env: MusicMidiControllerEnv;
private state: MusicMidiState = {
...defaultMusicMidiState,
supported: defaultEnv.supportsMidi(),
};
private readonly noteListeners = new Set<MidiNoteListener>();
private midiAccess: MIDIAccess | null = null;
private activeInput: MIDIInput | null = null;
private preferredInput: StoredMidiDevice | null = null;
private initializePromise: Promise<void> | null = null;
private queuedOperation: Promise<void> = Promise.resolve();
private store: MusicMidiControllerStore | null = null;
constructor(env: MusicMidiControllerEnv = defaultEnv) {
this.env = env;
}
subscribeToNotes = (listener: MidiNoteListener) => {
this.noteListeners.add(listener);
return () => {
this.noteListeners.delete(listener);
};
};
bindStore = (store: MusicMidiControllerStore) => {
this.store = store;
this.store.dispatch(trackerActions.setMidiState(this.state));
};
private logError(error: unknown) {
// eslint-disable-next-line no-console
console.error(error);
}
initialize = async () => {
if (this.initializePromise) {
return this.initializePromise;
}
this.setState({
...this.state,
supported: this.env.supportsMidi(),
});
this.initializePromise = (async () => {
const [enabled, storedDevice] = await Promise.all([
this.env.getStoredEnabled(),
this.env.getStoredDevice(),
]);
this.preferredInput = storedDevice;
this.setState({
...this.state,
enabled,
selectedInputId: enabled ? (storedDevice?.id ?? null) : null,
});
if (enabled) {
await this.enableAccess();
}
})().catch((error) => {
this.logError(error);
this.setState({
...this.state,
enabled: false,
inputs: [],
selectedInputId: null,
});
});
return this.initializePromise;
};
toggleEnabled = async () => {
await this.setEnabled(!this.state.enabled);
};
setEnabled = async (enabled: boolean) => {
await this.runExclusive(async () => {
await this.initialize();
if (enabled) {
await this.enableAccess();
return;
}
await this.disableAccess();
});
};
toggleRecordingEnabled = () => {
this.setRecordingEnabled(!this.state.recordingEnabled);
};
setRecordingEnabled = (recordingEnabled: boolean) => {
Iif (this.state.recordingEnabled === recordingEnabled) {
return;
}
this.setState({
...this.state,
recordingEnabled,
});
};
selectInput = async (inputId: string) => {
await this.runExclusive(async () => {
await this.initialize();
const selectedInput = this.midiAccess?.inputs.get(inputId) ?? null;
this.preferredInput = toStoredMidiDevice(selectedInput) ?? {
id: inputId,
name: null,
manufacturer: null,
};
await this.env.setStoredDevice(this.preferredInput);
Iif (!this.midiAccess) {
this.setState({
...this.state,
selectedInputId: inputId,
});
return;
}
await this.refreshInputs();
});
};
private async runExclusive(operation: () => Promise<void>) {
const nextOperation = this.queuedOperation.then(operation, operation);
this.queuedOperation = nextOperation.catch(() => undefined);
await nextOperation;
}
private setState(nextState: MusicMidiState) {
this.state = nextState;
this.store?.dispatch(trackerActions.setMidiState(nextState));
}
private setAccessStateListener(midiAccess: MIDIAccess | null) {
Iif (this.midiAccess) {
this.midiAccess.onstatechange = null;
}
if (midiAccess) {
midiAccess.onstatechange = () => {
void this.refreshInputs();
};
}
}
private setActiveInput(input: MIDIInput | null) {
if (this.activeInput) {
this.activeInput.onmidimessage = null;
}
this.activeInput = input;
Iif (!input) {
return;
}
input.onmidimessage = (event) => {
Iif (!event.data) {
return;
}
const note = getMidiNoteFromMessage(event.data);
Iif (note === null) {
return;
}
for (const listener of this.noteListeners) {
listener(note);
}
};
}
private async enableAccess() {
Iif (!this.state.supported) {
this.logError(
new Error("Web MIDI API is not supported in this environment."),
);
await this.env.setStoredEnabled(false);
this.setState({
...this.state,
enabled: false,
inputs: [],
selectedInputId: null,
});
return;
}
try {
const midiAccess = await this.env.requestAccess();
this.setAccessStateListener(midiAccess);
this.midiAccess = midiAccess;
await this.env.setStoredEnabled(true);
await this.refreshInputs();
this.setState({
...this.state,
enabled: true,
});
} catch (error) {
this.logError(error);
this.setAccessStateListener(null);
this.midiAccess = null;
this.setActiveInput(null);
await this.env.setStoredEnabled(false);
this.setState({
...this.state,
enabled: false,
inputs: [],
selectedInputId: null,
});
}
}
private async disableAccess() {
this.setAccessStateListener(null);
this.midiAccess = null;
this.setActiveInput(null);
await this.env.setStoredEnabled(false);
this.setState({
...this.state,
enabled: false,
inputs: [],
selectedInputId: null,
});
}
private async refreshInputs() {
Iif (!this.midiAccess) {
return;
}
const inputs = getMidiInputDevices(this.midiAccess);
const matchedPreferredInput = findBestMatchingInput(
this.midiAccess,
this.preferredInput,
);
const selectedInput =
matchedPreferredInput ??
(inputs.length > 0
? (this.midiAccess.inputs.get(inputs[0].id) ?? null)
: null);
if (!this.preferredInput && selectedInput) {
this.preferredInput = toStoredMidiDevice(selectedInput);
await this.env.setStoredDevice(this.preferredInput);
} else if (matchedPreferredInput) {
const normalizedMatchedInput = toStoredMidiDevice(matchedPreferredInput);
if (
!isSameStoredMidiDevice(this.preferredInput, normalizedMatchedInput)
) {
this.preferredInput = normalizedMatchedInput;
await this.env.setStoredDevice(this.preferredInput);
}
}
const selectedInputId = selectedInput?.id ?? null;
this.setActiveInput(selectedInput);
this.setState({
...this.state,
inputs,
selectedInputId,
});
}
}
export const createMusicMidiController = (env?: MusicMidiControllerEnv) =>
new MusicMidiController(env);
export const musicMidiController = createMusicMidiController();
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