Add @mediabunny/aac-encoder extension package

src/adts/adts-demuxer.ts

@@ -6,7 +6,8 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
-import { aacChannelMap, aacFrequencyTable, AudioCodec } from '../codec';
+import { aacChannelMap, aacFrequencyTable } from '../../shared/aac-misc';
+import { AudioCodec } from '../codec';
 import { Demuxer } from '../demuxer';
 import {
 	ID3_V2_HEADER_SIZE,

src/adts/adts-misc.ts

@@ -1,47 +0,0 @@
-/*!
- * 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/.
- */
-
-import { AacAudioSpecificConfig } from '../codec';
-import { Bitstream } from '../misc';
-
-export type AdtsHeaderTemplate = {
-	header: Uint8Array;
-	bitstream: Bitstream;
-};
-
-export const buildAdtsHeaderTemplate = (config: AacAudioSpecificConfig): AdtsHeaderTemplate => {
-	const header = new Uint8Array(7);
-	const bitstream = new Bitstream(header);
-
-	const { objectType, frequencyIndex, channelConfiguration } = config;
-	const profile = objectType - 1;
-
-	bitstream.writeBits(12, 0b1111_11111111); // Syncword
-	bitstream.writeBits(1, 0); // MPEG Version
-	bitstream.writeBits(2, 0); // Layer
-	bitstream.writeBits(1, 1); // Protection absence
-	bitstream.writeBits(2, profile); // Profile
-	bitstream.writeBits(4, frequencyIndex); // MPEG-4 Sampling Frequency Index
-	bitstream.writeBits(1, 0); // Private bit
-	bitstream.writeBits(3, channelConfiguration); // MPEG-4 Channel Configuration
-	bitstream.writeBits(1, 0); // Originality
-	bitstream.writeBits(1, 0); // Home
-	bitstream.writeBits(1, 0); // Copyright ID bit
-	bitstream.writeBits(1, 0); // Copyright ID start
-	bitstream.skipBits(13); // Frame length (to be filled per packet)
-	bitstream.writeBits(11, 0x7ff); // Buffer fullness
-	bitstream.writeBits(2, 0); // Number of AAC frames minus 1
-	// Omit CRC check
-
-	return { header, bitstream };
-};
-
-export const writeAdtsFrameLength = (bitstream: Bitstream, frameLength: number) => {
-	bitstream.pos = 30;
-	bitstream.writeBits(13, frameLength);
-};

src/adts/adts-muxer.ts

@@ -6,16 +6,17 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
-import { parseAacAudioSpecificConfig, validateAudioChunkMetadata } from '../codec';
+import { buildAdtsHeaderTemplate, parseAacAudioSpecificConfig, writeAdtsFrameLength } from '../../shared/aac-misc';
+import { Bitstream } from '../../shared/bitstream';
+import { validateAudioChunkMetadata } from '../codec';
 import { Id3V2Writer } from '../id3';
 import { metadataTagsAreEmpty } from '../metadata';
-import { assert, Bitstream, toUint8Array } from '../misc';
+import { assert, toUint8Array } from '../misc';
 import { Muxer } from '../muxer';
 import { Output, OutputAudioTrack } from '../output';
 import { AdtsOutputFormat } from '../output-format';
 import { EncodedPacket } from '../packet';
 import { Writer } from '../writer';
-import { buildAdtsHeaderTemplate, writeAdtsFrameLength } from './adts-misc';
 
 export class AdtsMuxer extends Muxer {
 	private format: AdtsOutputFormat;

src/adts/adts-reader.ts

@@ -6,7 +6,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
-import { Bitstream } from '../misc';
+import { Bitstream } from '../../shared/bitstream';
 import { FileSlice, readBytes } from '../reader';
 
 export const MIN_ADTS_FRAME_HEADER_SIZE = 7;