Fix OGG Vorbis decoding error for files with empty EOS pages (VLC-encoded)

src/ogg/ogg-demuxer.ts

@@ -499,6 +499,10 @@ class OggAudioTrackBacking implements InputAudioTrackBacking {
 			return null;
 		}
 
+		if (packet.data.byteLength === 0) {
+			return null;
+		}
+
 		const { durationInSamples, vorbisBlockSize } = extractSampleMetadata(
 			packet.data,
 			this.bitstream.codecInfo,

test/browser/ogg-vorbis-windowed.test.ts

@@ -0,0 +1,26 @@
+import { expect, test } from 'vitest';
+import { Input } from '../../src/input.js';
+import { UrlSource } from '../../src/source.js';
+import { ALL_FORMATS } from '../../src/input-format.js';
+import { AudioBufferSink } from '../../src/media-sink.js';
+import { assert } from '../../src/misc.js';
+
+// VLC creates OGG files with an empty EOS page, which previously caused decoding errors
+test('can decode OGG Vorbis file with empty EOS page', async () => {
+	using input = new Input({
+		source: new UrlSource('/vorbis-eos.ogg'),
+		formats: ALL_FORMATS,
+	});
+
+	const track = await input.getPrimaryAudioTrack();
+	assert(track);
+
+	const sink = new AudioBufferSink(track);
+	const buffers: AudioBuffer[] = [];
+
+	for await (const { buffer } of sink.buffers(4, 10)) {
+		buffers.push(buffer);
+	}
+
+	expect(buffers.length).toBeGreaterThan(0);
+});