mediabunny/src/mpeg-ts/mpeg-ts-misc.ts

Pure TypeScript media toolkit for reading, writing, and converting media files, directly in the browser.

/*!
 * 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 const TIMESCALE = 90_000; // MPEG-TS timestamps run on a 90 kHz clock
export const TS_PACKET_SIZE = 188;

export const enum MpegTsStreamType {
	MP3_MPEG1 = 0x03,
	MP3_MPEG2 = 0x04,
	AAC = 0x0f,
	AC3_SYSTEM_A = 0x81,
	EAC3_SYSTEM_A = 0x87,
	PRIVATE_DATA = 0x06,
	AVC = 0x1b,
	HEVC = 0x24,
}

export const buildMpegTsMimeType = (codecStrings: (string | null)[]) => {
	let string = 'video/MP2T';

	const uniqueCodecStrings = [...new Set(codecStrings.filter(Boolean))];
	if (uniqueCodecStrings.length > 0) {
		string += `; codecs="${uniqueCodecStrings.join(', ')}"`;
	}

	return string;
};