feat: added MIDI keyboard support
This commit is contained in:
Xiaohan-Tian
+9
-4
@@ -93,18 +93,23 @@ export class KGCore {
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if (this.isPlaying) {
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await this.stopPlaying();
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}
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// Dispose audio interface
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const audioInterface = KGAudioInterface.instance();
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await audioInterface.dispose();
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// Dispose MIDI input (dynamic import to avoid circular dependency)
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const { KGMidiInput } = await import('./midi-input/KGMidiInput');
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const midiInput = KGMidiInput.instance();
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await midiInput.dispose();
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// Dispose config manager
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const configManager = ConfigManager.instance();
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await configManager.dispose();
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// Clear playback timer
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this.stopPlaybackUpdates();
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console.log("KGCore resources disposed successfully");
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} catch (error) {
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console.error("Error disposing KGCore resources:", error);
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@@ -0,0 +1,284 @@
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import { KGAudioInterface } from '../audio-interface/KGAudioInterface';
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import { useProjectStore } from '../../stores/projectStore';
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/**
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* KGMidiInput - MIDI input manager for the DAW
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* Implements the singleton pattern for global MIDI device management
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* Handles Web MIDI API integration for keyboard input
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*/
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export class KGMidiInput {
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// Private static instance for singleton pattern
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private static _instance: KGMidiInput | null = null;
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// MIDI state
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private midiAccess: MIDIAccess | null = null;
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private isInitialized: boolean = false;
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private connectedInputs: Map<string, MIDIInput> = new Map();
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// Private constructor to prevent direct instantiation
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private constructor() {
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console.log("KGMidiInput initialized");
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}
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/**
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* Get the singleton instance of KGMidiInput
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* Creates the instance if it doesn't exist yet
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*/
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public static instance(): KGMidiInput {
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if (!KGMidiInput._instance) {
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KGMidiInput._instance = new KGMidiInput();
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}
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return KGMidiInput._instance;
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}
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/**
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* Initialize the MIDI input manager
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*/
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public async initialize(): Promise<void> {
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if (this.isInitialized) {
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return;
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}
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try {
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console.log("KGMidiInput ready for MIDI access request");
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this.isInitialized = true;
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} catch (error) {
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console.error("Failed to initialize MIDI input manager:", error);
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throw error;
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}
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}
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/**
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* Request MIDI access from browser
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* This must be called after a user gesture (click, keydown, etc.)
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*/
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public async requestMIDIAccess(): Promise<void> {
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if (this.midiAccess) {
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console.log("MIDI access already granted");
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return;
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}
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try {
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// Check if Web MIDI API is available
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if (!navigator.requestMIDIAccess) {
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throw new Error("Web MIDI API is not supported in this browser");
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}
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// Request MIDI access
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this.midiAccess = await navigator.requestMIDIAccess();
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console.log("MIDI access granted");
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// Set up device listeners
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this.setupDeviceListeners();
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// Connect to all existing inputs
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this.connectToAllInputs();
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} catch (error) {
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console.error("Failed to request MIDI access:", error);
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throw error;
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}
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}
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/**
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* Set up listeners for MIDI device connection/disconnection
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*/
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private setupDeviceListeners(): void {
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if (!this.midiAccess) {
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return;
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}
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this.midiAccess.onstatechange = (event: MIDIConnectionEvent) => {
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const port = event.port;
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if (port && port.type === "input") {
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if (port.state === "connected") {
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console.log(`MIDI device connected: ${port.name}`);
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this.connectToInput(port as MIDIInput);
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} else if (port.state === "disconnected") {
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console.log(`MIDI device disconnected: ${port.name}`);
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this.disconnectFromInput(port.id);
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}
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}
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};
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}
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/**
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* Connect to all available MIDI inputs
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*/
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private connectToAllInputs(): void {
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if (!this.midiAccess) {
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return;
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}
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this.midiAccess.inputs.forEach((input) => {
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this.connectToInput(input);
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});
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console.log(`Connected to ${this.connectedInputs.size} MIDI input device(s)`);
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}
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/**
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* Connect to a specific MIDI input
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*/
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private connectToInput(input: MIDIInput): void {
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// Set up message handler
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input.onmidimessage = (event: MIDIMessageEvent) => {
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this.handleMIDIMessage(event);
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};
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// Store the input
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this.connectedInputs.set(input.id, input);
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console.log(`Listening to MIDI input: ${input.name} (${input.id})`);
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}
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/**
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* Disconnect from a specific MIDI input
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*/
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private disconnectFromInput(inputId: string): void {
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const input = this.connectedInputs.get(inputId);
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if (input) {
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input.onmidimessage = null;
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}
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this.connectedInputs.delete(inputId);
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}
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/**
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* Handle incoming MIDI messages
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*/
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private handleMIDIMessage(event: MIDIMessageEvent): void {
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if (!event.data) {
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return;
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}
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const [status, pitch, velocity] = event.data;
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// Extract command (high nibble) and channel (low nibble)
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const command = status & 0xf0;
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const channel = status & 0x0f;
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// Note On: command = 0x90 (144)
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if (command === 0x90 && velocity > 0) {
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console.log(`MIDI Note On: pitch=${pitch}, velocity=${velocity}, channel=${channel}`);
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this.triggerNoteOn(pitch, velocity);
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}
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// Note Off: command = 0x80 (128) or Note On with velocity 0
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else if (command === 0x80 || (command === 0x90 && velocity === 0)) {
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console.log(`MIDI Note Off: pitch=${pitch}, channel=${channel}`);
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this.triggerNoteOff(pitch);
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}
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// Control Change: command = 0xB0 (176)
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else if (command === 0xb0) {
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console.log(`MIDI Control Change: controller=${pitch}, value=${velocity}, channel=${channel}`);
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// TODO: Handle control changes (modulation, sustain pedal, etc.)
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}
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// Pitch Bend: command = 0xE0 (224)
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else if (command === 0xe0) {
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const pitchBendValue = (velocity << 7) | pitch;
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console.log(`MIDI Pitch Bend: value=${pitchBendValue}, channel=${channel}`);
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// TODO: Handle pitch bend
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}
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}
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/**
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* Trigger note on - play sound for MIDI note
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*/
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private triggerNoteOn(pitch: number, velocity: number): void {
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try {
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// Get the selected track ID from the store
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const selectedTrackId = useProjectStore.getState().selectedTrackId;
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// Don't play if no track is selected
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if (!selectedTrackId) {
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console.log('No track selected - MIDI input ignored');
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return;
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}
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// Get audio interface and start playing the note
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const audioInterface = KGAudioInterface.instance();
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if (audioInterface.getIsInitialized()) {
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// Try to start audio context if not started yet
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if (!audioInterface.getIsAudioContextStarted()) {
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audioInterface.startAudioContext().catch(() => {
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// Silently fail if still not allowed - browser policy
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});
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}
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// Trigger note attack if audio context is ready
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if (audioInterface.getIsAudioContextStarted()) {
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audioInterface.triggerNoteAttack(selectedTrackId, pitch, velocity);
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console.log(`MIDI triggered note attack: pitch=${pitch}, velocity=${velocity}, track=${selectedTrackId}`);
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}
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}
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} catch (error) {
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console.error(`Error triggering MIDI note on (pitch ${pitch}):`, error);
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}
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}
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/**
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* Trigger note off - stop sound for MIDI note
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*/
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private triggerNoteOff(pitch: number): void {
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try {
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// Get the selected track ID from the store
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const selectedTrackId = useProjectStore.getState().selectedTrackId;
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// Don't try to release if no track is selected
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if (!selectedTrackId) {
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return;
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}
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// Get audio interface and stop playing the note
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const audioInterface = KGAudioInterface.instance();
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if (audioInterface.getIsInitialized() && audioInterface.getIsAudioContextStarted()) {
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audioInterface.releaseNote(selectedTrackId, pitch);
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console.log(`MIDI released note: pitch=${pitch}, track=${selectedTrackId}`);
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}
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} catch (error) {
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console.error(`Error triggering MIDI note off (pitch ${pitch}):`, error);
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}
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}
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/**
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* Clean up MIDI resources
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*/
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public async dispose(): Promise<void> {
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try {
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// Disconnect from all inputs
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this.connectedInputs.forEach((input, inputId) => {
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this.disconnectFromInput(inputId);
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});
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this.connectedInputs.clear();
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// Clear MIDI access
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if (this.midiAccess) {
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this.midiAccess.onstatechange = null;
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this.midiAccess = null;
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}
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this.isInitialized = false;
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console.log("MIDI resources disposed successfully");
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} catch (error) {
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console.error("Error disposing MIDI resources:", error);
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}
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}
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// ===== GETTERS =====
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public getIsInitialized(): boolean {
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return this.isInitialized;
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}
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public getMIDIAccess(): MIDIAccess | null {
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return this.midiAccess;
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}
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public getConnectedInputs(): MIDIInput[] {
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return Array.from(this.connectedInputs.values());
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}
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public getConnectedInputCount(): number {
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return this.connectedInputs.size;
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}
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}
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