mediabunny/test/browser/conversion.test.ts

import { ALL_FORMATS } from '../../src/input-format.js';
import { Input } from '../../src/input.js';
import { AdtsOutputFormat, Mp4OutputFormat } from '../../src/output-format.js';
import { Output } from '../../src/output.js';
import { BufferSource, UrlSource } from '../../src/source.js';
import { expect, test } from 'vitest';
import { BufferTarget } from '../../src/target.js';
import { Conversion } from '../../src/conversion.js';
import { assert } from '../../src/misc.js';
import { InputVideoTrack } from '../../src/input-track.js';

test('Rotation is baked-in when rerendering', async () => {
	using input = new Input({
		source: new UrlSource('/rotate-buck-bunny.mp4'),
		formats: ALL_FORMATS,
	});

	const ogTrack = await input.getPrimaryVideoTrack();
	assert(ogTrack);

	expect(await ogTrack.getRotation()).toBe(90);
	expect(await ogTrack.getCodedWidth()).toBe(1920);
	expect(await ogTrack.getCodedHeight()).toBe(1080);
	expect(await ogTrack.getDisplayWidth()).toBe(1080);
	expect(await ogTrack.getDisplayHeight()).toBe(1920);

	const output = new Output({
		format: new Mp4OutputFormat(),
		target: new BufferTarget(),
	});

	const conversion = await Conversion.init({ input, output, video: {
		width: 320,
	} });
	await conversion.execute();

	using newInput = new Input({
		source: new BufferSource(output.target.buffer!),
		formats: ALL_FORMATS,
	});

	const track = await newInput.getPrimaryVideoTrack();
	assert(track);

	expect(await track.getCodedWidth()).toBe(320);
	expect(await track.getCodedHeight()).toBe(570);
	expect(await track.getDisplayWidth()).toBe(320);
	expect(await track.getDisplayHeight()).toBe(570);
	expect(await track.getRotation()).toBe(0);
});

test('Exceeding max allowed track count', async () => {
	using input = new Input({
		source: new UrlSource('/multiple-aac-tracks.mp4'),
		formats: ALL_FORMATS,
	});

	const output = new Output({
		format: new AdtsOutputFormat(),
		target: new BufferTarget(),
	});

	const conversion = await Conversion.init({ input, output });
	expect(conversion.utilizedTracks).toHaveLength(1);
	expect(conversion.discardedTracks).toHaveLength(1);
	expect(conversion.discardedTracks[0]!.reason).toBe('max_track_count_reached');
});

test('Fan-out', async () => {
	using input = new Input({
		source: new UrlSource('/video.mp4'),
		formats: ALL_FORMATS,
	});

	const output = new Output({
		format: new Mp4OutputFormat(),
		target: new BufferTarget(),
	});

	const conversion = await Conversion.init({
		input,
		output,
		video: [{ height: 480 }, { height: 360 }],
		audio: [], // Identical to discarding it
	});
	expect(conversion.utilizedTracks).toHaveLength(2);
	expect(conversion.discardedTracks).toHaveLength(1);
	expect(conversion.discardedTracks[0]!.reason).toBe('discarded_by_user');

	await conversion.execute();

	using otherInput = new Input({
		source: new BufferSource(output.target.buffer!),
		formats: ALL_FORMATS,
	});

	const tracks = await otherInput.getTracks() as InputVideoTrack[];
	expect(tracks.map(x => x.type)).toEqual(['video', 'video']);

	expect(await tracks[0]!.getDisplayHeight()).toBe(480);
	expect(await tracks[1]!.getDisplayHeight()).toBe(360);
});