Add @mediabunny/ac3 extension package

packages/ac3/src/shared.ts

@@ -0,0 +1,103 @@
+/*!
+ * Copyright (c) 2026-present, Vanilagy and contributors
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+export type WorkerCommand = {
+	type: 'init-decoder';
+	data: {
+		codec: string;
+	};
+} | {
+	type: 'decode';
+	data: {
+		ctx: number;
+		encodedData: ArrayBuffer;
+		timestamp: number;
+	};
+} | {
+	type: 'flush-decoder';
+	data: {
+		ctx: number;
+	};
+} | {
+	type: 'close-decoder';
+	data: {
+		ctx: number;
+	};
+} | {
+	type: 'init-encoder';
+	data: {
+		codec: string;
+		numberOfChannels: number;
+		sampleRate: number;
+		bitrate: number;
+	};
+} | {
+	type: 'encode';
+	data: {
+		ctx: number;
+		audioData: ArrayBuffer;
+		timestamp: number;
+	};
+} | {
+	type: 'flush-encoder';
+	data: {
+		ctx: number;
+	};
+} | {
+	type: 'close-encoder';
+	data: {
+		ctx: number;
+	};
+};
+
+export type WorkerResponseData = {
+	type: 'init-decoder';
+	ctx: number;
+	frameSize: number;
+} | {
+	type: 'decode';
+	pcmData: ArrayBuffer;
+	format: AudioSampleFormat;
+	channels: number;
+	sampleRate: number;
+	sampleCount: number;
+	pts: number;
+} | {
+	type: 'flush-decoder';
+} | {
+	type: 'close-decoder';
+} | {
+	type: 'init-encoder';
+	ctx: number;
+	frameSize: number;
+} | {
+	type: 'encode';
+	encodedData: ArrayBuffer;
+	pts: number;
+	duration: number;
+} | {
+	type: 'flush-encoder';
+} | {
+	type: 'close-encoder';
+};
+
+export type WorkerResponse = {
+	id: number;
+} & ({
+	success: true;
+	data: WorkerResponseData;
+} | {
+	success: false;
+	error: unknown;
+});
+
+export function assert(x: unknown): asserts x {
+	if (!x) {
+		throw new Error('Assertion failed.');
+	}
+}