mediabunny/test/node/hls-output.test.ts

import { expect, test, vi } from 'vitest';
import { Output, OutputTrackGroup } from '../../src/output.js';
import { HLS_OUTPUT_FORMATS_DEFAULT, HlsOutputFormat } from '../../src/output-format.js';
import { NullTarget } from '../../src/target.js';
import { EncodedAudioPacketSource, EncodedVideoPacketSource } from '../../src/media-source.js';
import { HlsMuxer } from '../../src/hls/hls-muxer.js';
import { AudioCodec, VideoCodec } from '../../src/codec.js';

const videoSource = (codec: VideoCodec = 'avc') => new EncodedVideoPacketSource(codec);
const audioSource = (codec: AudioCodec = 'aac') => new EncodedAudioPacketSource(codec);

test('Playlist assignment, single video', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addVideoTrack(videoSource());

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(1);
	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.groupId).toBeNull();
	expect(decl[0]!.references).toHaveLength(0);
});

test('Playlist assignment, single audio', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addAudioTrack(audioSource());

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(1);
	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.groupId).toBeNull();
	expect(decl[0]!.references).toHaveLength(0);
});

test('Playlist assignment, multiple video', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addVideoTrack(videoSource());
	output.addVideoTrack(videoSource());

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(2);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.groupId).toBeNull();
	expect(decl[0]!.references).toHaveLength(0);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.groupId).toBeNull();
	expect(decl[1]!.references).toHaveLength(0);
});

test('Playlist assignment, multiple audio', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addAudioTrack(audioSource());
	output.addAudioTrack(audioSource());

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(2);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.groupId).toBeNull();
	expect(decl[0]!.references).toHaveLength(0);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.groupId).toBeNull();
	expect(decl[1]!.references).toHaveLength(0);
});

test('Playlist assignment, multiple video with different metadata #1', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addVideoTrack(videoSource(), { languageCode: 'eng' });
	output.addVideoTrack(videoSource(), { languageCode: 'esp' });

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(3);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.groupId).toBe('video-1');
	expect(decl[0]!.references).toHaveLength(0);
	expect(decl[0]!.noUri).toBe(true);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.groupId).toBe('video-1');
	expect(decl[1]!.references).toHaveLength(0);
	expect(decl[1]!.noUri).toBe(false);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.groupId).toBeNull();
	expect(decl[2]!.references).toEqual(decl.slice(0, 2));

	expect(decl[2]!.playlist).toBe(decl[0]!.playlist);
});

test('Playlist assignment, multiple video with different metadata #2', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addVideoTrack(videoSource(), { disposition: { primary: true } });
	output.addVideoTrack(videoSource(), { disposition: { primary: false } });

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(3);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.groupId).toBe('video-1');
	expect(decl[0]!.references).toHaveLength(0);
	expect(decl[0]!.noUri).toBe(true);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.groupId).toBe('video-1');
	expect(decl[1]!.references).toHaveLength(0);
	expect(decl[1]!.noUri).toBe(false);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.groupId).toBeNull();
	expect(decl[2]!.references).toEqual(decl.slice(0, 2));

	expect(decl[2]!.playlist).toBe(decl[0]!.playlist);
});

test('Playlist assignment, multiple audio with different metadata', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addAudioTrack(audioSource(), { languageCode: 'eng' });
	output.addAudioTrack(audioSource(), { languageCode: 'esp' });

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(3);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[0]!.references).toHaveLength(0);
	expect(decl[0]!.noUri).toBe(true);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.groupId).toBe('audio-1');
	expect(decl[1]!.references).toHaveLength(0);
	expect(decl[1]!.noUri).toBe(false);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.groupId).toBeNull();
	expect(decl[2]!.references).toEqual(decl.slice(0, 2));

	expect(decl[2]!.playlist).toBe(decl[0]!.playlist);
});

test('Playlist assignment, video and audio', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addVideoTrack(videoSource());
	output.addAudioTrack(audioSource());

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(1);
	expect(decl[0]!.playlist.tracks).toHaveLength(2);
	expect(decl[0]!.groupId).toBeNull();
	expect(decl[0]!.references).toHaveLength(0);
});

test('Playlist assignment, one video and multiple audio', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addVideoTrack(videoSource());
	output.addAudioTrack(audioSource());
	output.addAudioTrack(audioSource());
	output.addAudioTrack(audioSource());

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(4);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[0]!.noUri).toBe(false);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[1]!.noUri).toBe(false);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[2]!.noUri).toBe(false);

	expect(decl[3]!.playlist.tracks).toHaveLength(1);
	expect(decl[3]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[3]!.groupId).toBeNull();
	expect(decl[3]!.references).toEqual(decl.slice(0, 3));
});

test('Playlist assignment, multiple video and one audio', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addVideoTrack(videoSource());
	output.addVideoTrack(videoSource());
	output.addVideoTrack(videoSource());
	output.addAudioTrack(audioSource());

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(4);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[0]!.noUri).toBe(false);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[1]!.groupId).toBeNull();
	expect(decl[1]!.references).toEqual([decl[0]!]);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[2]!.groupId).toBeNull();
	expect(decl[2]!.references).toEqual([decl[0]!]);

	expect(decl[3]!.playlist.tracks).toHaveLength(1);
	expect(decl[3]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[3]!.groupId).toBeNull();
	expect(decl[3]!.references).toEqual([decl[0]!]);
});

test('Playlist assignment, multiple video and audio', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addVideoTrack(videoSource());
	output.addVideoTrack(videoSource());
	output.addVideoTrack(videoSource());
	output.addAudioTrack(audioSource());
	output.addAudioTrack(audioSource());
	output.addAudioTrack(audioSource());

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(6);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[0]!.noUri).toBe(false);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[1]!.groupId).toBe('audio-1');
	expect(decl[1]!.noUri).toBe(false);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[2]!.groupId).toBe('audio-1');
	expect(decl[2]!.noUri).toBe(false);

	expect(decl[3]!.playlist.tracks).toHaveLength(1);
	expect(decl[3]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[3]!.groupId).toBeNull();
	expect(decl[3]!.references).toEqual(decl.slice(0, 3));

	expect(decl[4]!.playlist.tracks).toHaveLength(1);
	expect(decl[4]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[4]!.groupId).toBeNull();
	expect(decl[4]!.references).toEqual(decl.slice(0, 3));

	expect(decl[5]!.playlist.tracks).toHaveLength(1);
	expect(decl[5]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[5]!.groupId).toBeNull();
	expect(decl[5]!.references).toEqual(decl.slice(0, 3));
});

test('Playlist assignment, video and audio in different groups', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	const a = new OutputTrackGroup();
	const b = new OutputTrackGroup();

	output.addVideoTrack(videoSource(), { group: a });
	output.addAudioTrack(audioSource(), { group: b });

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(2);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[0]!.groupId).toBeNull();
	expect(decl[0]!.references).toHaveLength(0);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[1]!.groupId).toBeNull();
	expect(decl[1]!.references).toHaveLength(0);
});

test('Playlist assignment, multiple video and audio in pairs', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	const a = new OutputTrackGroup();
	const b = new OutputTrackGroup();
	const c = new OutputTrackGroup();

	output.addVideoTrack(videoSource(), { group: a });
	output.addVideoTrack(videoSource(), { group: b });
	output.addVideoTrack(videoSource(), { group: c });
	output.addAudioTrack(audioSource(), { group: a });
	output.addAudioTrack(audioSource(), { group: b });
	output.addAudioTrack(audioSource(), { group: c });

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(3);

	expect(decl[0]!.playlist.tracks).toHaveLength(2);
	expect(decl[0]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[0]!.playlist.tracks[1]!.type).toBe('audio');
	expect(decl[0]!.groupId).toBeNull();
	expect(decl[0]!.references).toHaveLength(0);

	expect(decl[1]!.playlist.tracks).toHaveLength(2);
	expect(decl[1]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[1]!.playlist.tracks[1]!.type).toBe('audio');
	expect(decl[1]!.groupId).toBeNull();
	expect(decl[1]!.references).toHaveLength(0);

	expect(decl[2]!.playlist.tracks).toHaveLength(2);
	expect(decl[2]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[2]!.playlist.tracks[1]!.type).toBe('audio');
	expect(decl[2]!.groupId).toBeNull();
	expect(decl[2]!.references).toHaveLength(0);
});

test('Playlist assignment, multiple video and audio with some unpaired', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	const a = new OutputTrackGroup();
	const b = new OutputTrackGroup();
	const c = new OutputTrackGroup();

	output.addVideoTrack(videoSource(), { group: a });
	output.addVideoTrack(videoSource(), { group: a });
	output.addVideoTrack(videoSource(), { group: b });
	output.addAudioTrack(audioSource(), { group: a });
	output.addAudioTrack(audioSource(), { group: a });
	output.addAudioTrack(audioSource(), { group: c });

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(6);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[0]!.noUri).toBe(false);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[1]!.groupId).toBe('audio-1');
	expect(decl[1]!.noUri).toBe(false);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[2]!.groupId).toBeNull();
	expect(decl[2]!.references).toEqual(decl.slice(0, 2));

	expect(decl[3]!.playlist.tracks).toHaveLength(1);
	expect(decl[3]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[3]!.groupId).toBeNull();
	expect(decl[3]!.references).toEqual(decl.slice(0, 2));

	expect(decl[4]!.playlist.tracks).toHaveLength(1);
	expect(decl[4]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[4]!.groupId).toBeNull();
	expect(decl[4]!.references).toHaveLength(0);

	expect(decl[5]!.playlist.tracks).toHaveLength(1);
	expect(decl[5]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[5]!.groupId).toBeNull();
	expect(decl[5]!.references).toHaveLength(0);
});

test('Playlist assignment, multiple video and audio with multiple groups', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	const a = new OutputTrackGroup();
	const b = new OutputTrackGroup();

	output.addVideoTrack(videoSource(), { group: a });
	output.addVideoTrack(videoSource(), { group: a });
	output.addVideoTrack(videoSource(), { group: b });
	output.addVideoTrack(videoSource(), { group: b });
	output.addAudioTrack(audioSource(), { group: a });
	output.addAudioTrack(audioSource(), { group: a });
	output.addAudioTrack(audioSource(), { group: b });
	output.addAudioTrack(audioSource(), { group: b });

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(8);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[0]!.noUri).toBe(false);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[1]!.groupId).toBe('audio-1');
	expect(decl[1]!.noUri).toBe(false);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[2]!.groupId).toBe('audio-2');
	expect(decl[2]!.noUri).toBe(false);

	expect(decl[3]!.playlist.tracks).toHaveLength(1);
	expect(decl[3]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[3]!.groupId).toBe('audio-2');
	expect(decl[3]!.noUri).toBe(false);

	expect(decl[4]!.playlist.tracks).toHaveLength(1);
	expect(decl[4]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[4]!.groupId).toBeNull();
	expect(decl[4]!.references).toEqual(decl.slice(0, 2));

	expect(decl[5]!.playlist.tracks).toHaveLength(1);
	expect(decl[5]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[5]!.groupId).toBeNull();
	expect(decl[5]!.references).toEqual(decl.slice(0, 2));

	expect(decl[6]!.playlist.tracks).toHaveLength(1);
	expect(decl[6]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[6]!.groupId).toBeNull();
	expect(decl[6]!.references).toEqual(decl.slice(2, 4));

	expect(decl[7]!.playlist.tracks).toHaveLength(1);
	expect(decl[7]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[7]!.groupId).toBeNull();
	expect(decl[7]!.references).toEqual(decl.slice(2, 4));
});

test('Playlist assignment, video with multiple audio codecs', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addVideoTrack(videoSource());
	output.addAudioTrack(audioSource('aac'));
	output.addAudioTrack(audioSource('ac3'));

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(4);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[0]!.playlist.tracks[0]!.source._codec).toBe('aac');
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[0]!.noUri).toBe(false);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[1]!.playlist.tracks[0]!.source._codec).toBe('ac3');
	expect(decl[1]!.groupId).toBe('audio-2');
	expect(decl[1]!.noUri).toBe(false);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[2]!.groupId).toBeNull();
	expect(decl[2]!.references).toEqual([decl[0]!]);

	expect(decl[3]!.playlist.tracks).toHaveLength(1);
	expect(decl[3]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[3]!.groupId).toBeNull();
	expect(decl[3]!.references).toEqual([decl[1]!]);

	expect(decl[2]!.playlist).toBe(decl[3]!.playlist);
});

test('Playlist assignment, audio with multiple video codecs', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	output.addVideoTrack(videoSource('avc'));
	output.addVideoTrack(videoSource('hevc'));
	output.addAudioTrack(audioSource());

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(3);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[0]!.noUri).toBe(false);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[1]!.playlist.tracks[0]!.source._codec).toBe('avc');
	expect(decl[1]!.groupId).toBeNull();
	expect(decl[1]!.references).toEqual([decl[0]!]);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[2]!.playlist.tracks[0]!.source._codec).toBe('hevc');
	expect(decl[2]!.groupId).toBeNull();
	expect(decl[2]!.references).toEqual([decl[0]!]);
});

test('Playlist assignment, multiple video with conflicting audio interests', async () => {
	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	const a = new OutputTrackGroup();
	const b = new OutputTrackGroup();

	output.addVideoTrack(videoSource(), { group: a });
	output.addVideoTrack(videoSource(), { group: b });
	output.addAudioTrack(audioSource(), { group: [a, b] });
	output.addAudioTrack(audioSource(), { group: a });

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(5);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[0]!.groupId).toBe('audio-1');
	expect(decl[0]!.noUri).toBe(false);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[1]!.groupId).toBe('audio-1');
	expect(decl[1]!.noUri).toBe(false);

	expect(decl[2]!.playlist.tracks).toHaveLength(1);
	expect(decl[2]!.playlist.tracks[0]!.type).toBe('audio');
	expect(decl[2]!.playlist).toBe(decl[0]!.playlist);
	expect(decl[2]!.groupId).toBe('audio-2');
	expect(decl[2]!.noUri).toBe(false);

	expect(decl[3]!.playlist.tracks).toHaveLength(1);
	expect(decl[3]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[3]!.groupId).toBeNull();
	expect(decl[3]!.references).toEqual([decl[0]!, decl[1]!]);

	expect(decl[4]!.playlist.tracks).toHaveLength(1);
	expect(decl[4]!.playlist.tracks[0]!.type).toBe('video');
	expect(decl[4]!.groupId).toBeNull();
	expect(decl[4]!.references).toEqual([decl[2]!]);
});

test('Playlist assignment, video paired with video', async () => {
	const consoleSpy = vi.spyOn(console, 'warn');

	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	const a = new OutputTrackGroup();
	const b = new OutputTrackGroup();
	a.pairWith(b);

	output.addVideoTrack(videoSource(), { group: a });
	output.addVideoTrack(videoSource(), { group: b });

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(2);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.groupId).toBeNull();
	expect(decl[0]!.references).toHaveLength(0);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.groupId).toBeNull();
	expect(decl[1]!.references).toHaveLength(0);

	expect(consoleSpy.mock.calls).toHaveLength(1);
	expect(consoleSpy.mock.calls[0]![0]).toContain('Illegal pairing');
});

test('Playlist assignment, audio paired with audio', async () => {
	const consoleSpy = vi.spyOn(console, 'warn');

	const output = new Output({
		format: new HlsOutputFormat({
			segmentFormats: HLS_OUTPUT_FORMATS_DEFAULT,
		}),
		target: () => new NullTarget(),
		rootPath: '',
	});

	const a = new OutputTrackGroup();
	const b = new OutputTrackGroup();
	a.pairWith(b);

	output.addAudioTrack(audioSource(), { group: a });
	output.addAudioTrack(audioSource(), { group: b });

	await output.start();

	const muxer = output._muxer as HlsMuxer;
	const decl = muxer.playlistDeclarations;

	expect(decl).toHaveLength(2);

	expect(decl[0]!.playlist.tracks).toHaveLength(1);
	expect(decl[0]!.groupId).toBeNull();
	expect(decl[0]!.references).toHaveLength(0);

	expect(decl[1]!.playlist.tracks).toHaveLength(1);
	expect(decl[1]!.groupId).toBeNull();
	expect(decl[1]!.references).toHaveLength(0);

	expect(consoleSpy.mock.calls).toHaveLength(1);
	expect(consoleSpy.mock.calls[0]![0]).toContain('Illegal pairing');
});