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MPEG-TS demuxer optimizations: faster Annex B segmentation, better NALU iteration

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Vanilagy
2026-01-16 13:26:58 +01:00
parent e3ee9d91a9
commit ae37973878
7 changed files with 267 additions and 238 deletions
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test/node/annex-b-conversion.test.ts
+5 -3
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@@ -8,7 +8,7 @@ import { Mp4OutputFormat } from '../../src/output-format.js';
import { BufferTarget } from '../../src/target.js';
import { Conversion } from '../../src/conversion.js';
import { EncodedPacketSink } from '../../src/media-sink.js';
import { extractAvcNalUnits } from '../../src/codec-data.js';
import { iterateAvcNalUnits } from '../../src/codec-data.js';
const __dirname = new URL('.', import.meta.url).pathname;
@@ -26,7 +26,8 @@ test('Annex B to length-prefixed conversion, MP4', async () => {
const originalFirstPacket = await originalSink.getFirstPacket();
expect([...originalFirstPacket!.data.slice(0, 4)]).toEqual([0, 0, 0, 1]);
const originalNalUnits = extractAvcNalUnits(originalFirstPacket!.data, originalDecoderConfig);
const originalNalUnits = [...iterateAvcNalUnits(originalFirstPacket!.data, originalDecoderConfig)]
.map(loc => originalFirstPacket!.data.subarray(loc.offset, loc.offset + loc.length));
const output = new Output({
format: new Mp4OutputFormat(),
@@ -49,6 +50,7 @@ test('Annex B to length-prefixed conversion, MP4', async () => {
const newFirstPacket = await newSink.getFirstPacket();
expect([...newFirstPacket!.data.slice(0, 4)]).not.toEqual([0, 0, 0, 1]); // Successfully converted
const newNalUnits = extractAvcNalUnits(newFirstPacket!.data, newDecoderConfig);
const newNalUnits = [...iterateAvcNalUnits(newFirstPacket!.data, newDecoderConfig)]
.map(loc => newFirstPacket!.data.subarray(loc.offset, loc.offset + loc.length));
expect(newNalUnits).toEqual(originalNalUnits); // Content is the same though
});