Add metadata-based duration retrieval

test/node/duration-from-metadata.test.ts

@@ -0,0 +1,124 @@
+import { expect, test } from 'vitest';
+import path from 'node:path';
+import { ALL_FORMATS, Input, FilePathSource } from '../../src/index.js';
+import { assert } from '../../src/misc.js';
+
+const __dirname = new URL('.', import.meta.url).pathname;
+const publicPath = (file: string) => path.join(__dirname, '../public', file);
+
+test('MP4 ISOBMFF duration metadata', async () => {
+	using input = new Input({
+		source: new FilePathSource(publicPath('video.mp4')),
+		formats: ALL_FORMATS,
+	});
+
+	expect(await input.getDurationFromMetadata()).toBe(5.056);
+	expect(await input.computeDuration()).toBe(5.056);
+
+	const videoTrack = await input.getPrimaryVideoTrack();
+	assert(videoTrack);
+	expect(await videoTrack.getDurationFromMetadata()).toBe(5);
+
+	const audioTrack = await input.getPrimaryAudioTrack();
+	assert(audioTrack);
+	expect(await audioTrack.getDurationFromMetadata()).toBe(5.056);
+});
+
+test('Matroska MKV duration metadata', async () => {
+	using input = new Input({
+		source: new FilePathSource(publicPath('ac3.mkv')),
+		formats: ALL_FORMATS,
+	});
+
+	expect(await input.getDurationFromMetadata()).toBe(2);
+	expect(await input.computeDuration()).toBe(2);
+
+	const audioTrack = await input.getPrimaryAudioTrack();
+	assert(audioTrack);
+	expect(await audioTrack.getDurationFromMetadata()).toBe(2);
+});
+
+test('MPEG-TS duration metadata', async () => {
+	using input = new Input({
+		source: new FilePathSource(publicPath('0.ts')),
+		formats: ALL_FORMATS,
+	});
+
+	expect(await input.getDurationFromMetadata()).toBe(null);
+	expect(await input.computeDuration()).not.toBe(null);
+
+	const tracks = await input.getTracks();
+	for (const track of tracks) {
+		expect(await track.getDurationFromMetadata()).toBe(null);
+	}
+});
+
+test('FLAC duration metadata', async () => {
+	using input = new Input({
+		source: new FilePathSource(publicPath('sample.flac')),
+		formats: ALL_FORMATS,
+	});
+
+	expect(await input.getDurationFromMetadata()).toBe(19.714285714285715);
+	expect(await input.computeDuration()).toBe(19.714285714285715);
+
+	const audioTrack = await input.getPrimaryAudioTrack();
+	assert(audioTrack);
+	expect(await audioTrack.getDurationFromMetadata()).toBe(19.714285714285715);
+});
+
+test('WAV duration metadata', async () => {
+	using input = new Input({
+		source: new FilePathSource(publicPath('glitch-hop-is-dead.wav')),
+		formats: ALL_FORMATS,
+	});
+
+	expect(await input.getDurationFromMetadata()).toBe(9.63718820861678);
+	expect(await input.computeDuration()).toBe(9.63718820861678);
+
+	const audioTrack = await input.getPrimaryAudioTrack();
+	assert(audioTrack);
+	expect(await audioTrack.getDurationFromMetadata()).toBe(9.63718820861678);
+});
+
+test('OGG Vorbis duration metadata', async () => {
+	using input = new Input({
+		source: new FilePathSource(publicPath('vorbis-eos.ogg')),
+		formats: ALL_FORMATS,
+	});
+
+	expect(await input.getDurationFromMetadata()).toBe(null);
+
+	const tracks = await input.getTracks();
+	for (const track of tracks) {
+		expect(await track.getDurationFromMetadata()).toBe(null);
+	}
+});
+
+test('ADTS AAC duration metadata', async () => {
+	using input = new Input({
+		source: new FilePathSource(publicPath('sample3.aac')),
+		formats: ALL_FORMATS,
+	});
+
+	expect(await input.getDurationFromMetadata()).toBe(null);
+
+	const tracks = await input.getTracks();
+	for (const track of tracks) {
+		expect(await track.getDurationFromMetadata()).toBe(null);
+	}
+});
+
+test('MP3 duration metadata', async () => {
+	using input = new Input({
+		source: new FilePathSource(publicPath('Toothsome-Meme.VBRv2.mp3')),
+		formats: ALL_FORMATS,
+	});
+
+	expect(await input.getDurationFromMetadata()).toBe(38.568);
+	expect(await input.computeDuration()).toBe(38.568000000000005);
+
+	const audioTrack = await input.getPrimaryAudioTrack();
+	assert(audioTrack);
+	expect(await audioTrack.getDurationFromMetadata()).toBe(38.568);
+});