chore: monorepo setup (#7175)

packages/voice/src/receive/SpeakingMap.ts

@@ -0,0 +1,62 @@
+import { TypedEmitter } from 'tiny-typed-emitter';
+import type { Awaited } from '../util/util';
+
+/**
+ * The events that a SpeakingMap can emit.
+ */
+export interface SpeakingMapEvents {
+	/**
+	 * Emitted when a user starts speaking.
+	 */
+	start: (userId: string) => Awaited<void>;
+
+	/**
+	 * Emitted when a user stops speaking.
+	 */
+	end: (userId: string) => Awaited<void>;
+}
+
+/**
+ * Tracks the speaking states of users in a voice channel.
+ */
+export class SpeakingMap extends TypedEmitter<SpeakingMapEvents> {
+	/**
+	 * The delay after a packet is received from a user until they're marked as not speaking anymore.
+	 */
+	public static readonly DELAY = 100;
+
+	/**
+	 * The currently speaking users, mapped to the milliseconds since UNIX epoch at which they started speaking.
+	 */
+	public readonly users: Map<string, number>;
+
+	private readonly speakingTimeouts: Map<string, NodeJS.Timeout>;
+
+	public constructor() {
+		super();
+		this.users = new Map();
+		this.speakingTimeouts = new Map();
+	}
+
+	public onPacket(userId: string) {
+		const timeout = this.speakingTimeouts.get(userId);
+		if (timeout) {
+			clearTimeout(timeout);
+		} else {
+			this.users.set(userId, Date.now());
+			this.emit('start', userId);
+		}
+		this.startTimeout(userId);
+	}
+
+	private startTimeout(userId: string) {
+		this.speakingTimeouts.set(
+			userId,
+			setTimeout(() => {
+				this.emit('end', userId);
+				this.speakingTimeouts.delete(userId);
+				this.users.delete(userId);
+			}, SpeakingMap.DELAY),
+		);
+	}
+}