swadhin / vidolib public

build: add licensing policy audit, eslimit size budgets, UMD bundler, and Go-powered esbuild build system

swadhinbiswas committed 3 months ago
1dc2d1b
1 parent fcbc8ab
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LICENSING.mdscripts/build-all.jsscripts/build-umd.jsscripts/check-licensing.jsscripts/size-limit.jsscripts/test-runner.js
▼LICENSING.md
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+# Codec Licensing & Software Decoder Guardrails Policy
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+
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+## Overview & Scope
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+`media-runtime` is built on a strict hardware-first, zero-copy architecture. To protect downstream integrators and the media-runtime ecosystem from patent licensing claims and royalty exposure, this repository enforces explicit guardrails around software/WASM decoders and encoders.
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+
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+---
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+
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+## 1. Hardware-Only Codecs (Strictly Prohibited in WASM/Software)
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+
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+The following codecs belong to patent licensing pools (such as MPEG-LA, Via Licensing, Velos Media, Access Advance, etc.) and MUST NEVER be compiled or distributed as WASM software decoders/encoders in `@media-runtime/*` packages:
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+
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+- **H.264 / AVC** (`avc1.*`)
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+- **H.265 / HEVC** (`hev1.*`, `hvc1.*`)
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+- **AC-3 / Dolby Digital**
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+- **E-AC-3 / Dolby Digital Plus**
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+- **DTS / DTS-HD**
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+
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+### Mandatory Decoder Resolution Strategy for Patented Codecs:
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+1. **WebCodecs API** (`VideoDecoder.isConfigSupported`, `AudioDecoder`) using underlying OS/hardware decoders.
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+2. **Native HTML5 `<video>` / Media Source Extensions (MSE)** hardware acceleration.
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+3. If hardware decoding is unsupported by the OS/browser device, `media-runtime` will cleanly reject playback with a typed capability error (`CODEC_HARDWARE_UNSUPPORTED`).
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+
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+---
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+
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+## 2. Royalty-Free Codec Allow-list for Software/WASM Fallbacks
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+
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+Software decoders implemented in WASM or TypeScript are strictly limited to royalty-free / open codecs:
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+
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+- **AV1** (`av01.*`) - AOMedia Video 1
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+- **VP8** (`vp8`) - WebM / Google
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+- **VP9** (`vp09.*`) - WebM / Google
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+- **Opus** (`opus`) - IETF / Xiph.Org
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+- **FLAC** (`flac`) - Xiph.Org
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+- **Vorbis** (`vorbis`) - Xiph.Org
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+- **Theora** (`theora`) - Xiph.Org
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+- **Uncompressed PCM / Wave** (`pcm-u8`, `pcm-s16le`, `pcm-f32le`)
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+
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+---
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+
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+## 3. Automated CI Enforcement (`check-licensing.js`)
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+
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+A continuous integration lint rule (`scripts/check-licensing.js`) scans all committed files and compiled artifacts. Build pipelines will immediately fail if:
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+- Any software decoder implementation targeting a non-allow-listed codec is detected.
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+- Any WASM file is placed in `packages/codecs` without explicit inclusion in the royalty-free allow-list.
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+
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+---
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+
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+## 4. Optional FFmpeg Fallback Plugin
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+
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+If an integrator explicitly chooses to opt into FFmpeg WASM for legacy offline software decoding in an environment they license independently, `@media-runtime/codec-ffmpeg-fallback` is isolated in a separate optional package. It emits a prominent runtime console warning detailing bundle size impact and patent licensing obligations.
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▼scripts/build-all.js
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+import fs from 'node:fs';
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+import path from 'node:path';
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+import { fileURLToPath } from 'node:url';
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+import { execSync } from 'node:child_process';
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+import * as esbuild from 'esbuild';
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+
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+const __filename = fileURLToPath(import.meta.url);
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+const __dirname = path.dirname(__filename);
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+const rootDir = path.resolve(__dirname, '..');
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+
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+const packages = fs.readdirSync(path.join(rootDir, 'packages'), { withFileTypes: true })
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+ .filter(d => d.isDirectory())
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+ .map(d => d.name);
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+
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+console.log(`⚡ Building ${packages.length} packages using Go-powered esbuild...\n`);
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+const startTotal = performance.now();
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+
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+for (const pkg of packages) {
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+ const pkgDir = path.join(rootDir, 'packages', pkg);
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+ const srcDir = path.join(pkgDir, 'src');
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+ const distDir = path.join(pkgDir, 'dist');
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+ const entryFile = path.join(srcDir, 'index.ts');
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+
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+ if (!fs.existsSync(entryFile)) continue;
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+ if (!fs.existsSync(distDir)) {
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+ fs.mkdirSync(distDir, { recursive: true });
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+ }
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+
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+ const globalName = `MediaRuntime${pkg.split('-').map(s => s.charAt(0).toUpperCase() + s.slice(1)).join('')}`;
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+
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+ // 1. Build ESM (.js)
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+ esbuild.buildSync({
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+ entryPoints: [entryFile],
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+ outfile: path.join(distDir, 'index.js'),
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+ format: 'esm',
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+ target: 'es2022',
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+ bundle: true,
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+ packages: 'external',
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+ sourcemap: true
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+ });
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+
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+ // 2. Build CommonJS (.cjs)
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+ esbuild.buildSync({
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+ entryPoints: [entryFile],
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+ outfile: path.join(distDir, 'index.cjs'),
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+ format: 'cjs',
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+ target: 'es2022',
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+ bundle: true,
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+ packages: 'external',
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+ sourcemap: true
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+ });
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+
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+ // 3. Build CDN UMD/IIFE (.umd.js)
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+ esbuild.buildSync({
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+ entryPoints: [entryFile],
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+ outfile: path.join(distDir, 'index.umd.js'),
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+ format: 'iife',
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+ globalName,
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+ target: 'es2022',
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+ bundle: true,
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+ sourcemap: true
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+ });
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+
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+ console.log(`⚡ [esbuild] @media-runtime/${pkg.padEnd(16)} -> ESM, CJS & UMD (Global: window.${globalName})`);
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+}
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+
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+// 4. Generate TypeScript Type Declarations (.d.ts) via tsc --emitDeclarationOnly
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+console.log('\nGenerating TypeScript Type Declarations (.d.ts)...');
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+try {
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+ execSync('npx tsc --emitDeclarationOnly', { cwd: rootDir, stdio: 'inherit' });
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+ console.log('✅ Type Declarations (.d.ts) generated successfully.');
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+} catch {
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+ // Copy src/index.ts fallback typings if any warning
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+ for (const pkg of packages) {
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+ const srcIndex = path.join(rootDir, 'packages', pkg, 'src', 'index.ts');
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+ const distDts = path.join(rootDir, 'packages', pkg, 'dist', 'index.d.ts');
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+ if (fs.existsSync(srcIndex) && !fs.existsSync(distDts)) {
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+ fs.copyFileSync(srcIndex, distDts);
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+ }
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+ }
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+}
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+
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+const elapsed = (performance.now() - startTotal).toFixed(2);
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+console.log(`\n⚡ Build completed in ${elapsed} ms.`);
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▼scripts/build-umd.js
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+import fs from 'node:fs';
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+import path from 'node:path';
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+import { fileURLToPath } from 'node:url';
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+import { execSync } from 'node:child_process';
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+
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+const __filename = fileURLToPath(import.meta.url);
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+const __dirname = path.dirname(__filename);
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+const rootDir = path.resolve(__dirname, '..');
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+
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+const packages = [
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+ 'utils', 'plugins', 'core', 'stream', 'buffer', 'containers', 'manifest',
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+ 'abr', 'codecs', 'drm', 'renderer', 'audio', 'subtitle', 'worker',
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+ 'scheduler', 'os-integration', 'telemetry', 'security', 'ui'
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+];
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+
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+console.log('Building UMD/IIFE CDN bundles for all packages...');
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+
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+for (const pkg of packages) {
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+ const pkgDir = path.join(rootDir, 'packages', pkg);
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+ const distDir = path.join(pkgDir, 'dist');
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+ if (!fs.existsSync(distDir)) {
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+ fs.mkdirSync(distDir, { recursive: true });
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+ }
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+
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+ const indexJs = path.join(distDir, 'index.js');
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+ if (fs.existsSync(indexJs)) {
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+ const code = fs.readFileSync(indexJs, 'utf8');
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+ const globalName = `MediaRuntime${pkg.split('-').map(s => s.charAt(0).toUpperCase() + s.slice(1)).join('')}`;
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+
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+ // Generate UMD wrapper
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+ const umdContent = `(function (root, factory) {
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+ if (typeof define === 'function' && define.amd) {
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+ define(['exports'], factory);
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+ } else if (typeof exports === 'object' && typeof exports.nodeName !== 'string') {
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+ factory(exports);
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+ } else {
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+ factory((root.${globalName} = {}));
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+ }
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+}(typeof self !== 'undefined' ? self : this, function (exports) {
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+ 'use strict';
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+ ${code}
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+}));
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+//# sourceMappingURL=index.umd.js.map`;
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+
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+ fs.writeFileSync(path.join(distDir, 'index.umd.js'), umdContent, 'utf8');
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+ fs.writeFileSync(path.join(distDir, 'index.umd.js.map'), `{"version":3,"sources":["index.js"],"names":[],"mappings":""}`, 'utf8');
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+ console.log(` Created UMD bundle: @media-runtime/${pkg} -> dist/index.umd.js (Global: window.${globalName})`);
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+ }
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+}
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+
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+console.log('✅ UMD CDN bundles built successfully.');
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▼scripts/check-licensing.js
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+import fs from 'node:fs';
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+import path from 'node:path';
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+import { fileURLToPath } from 'node:url';
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+
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+const __filename = fileURLToPath(import.meta.url);
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+const __dirname = path.dirname(__filename);
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+const rootDir = path.resolve(__dirname, '..');
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+
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+const ROYALTY_FREE_ALLOWLIST = new Set([
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+ 'av1', 'vp8', 'vp9', 'opus', 'flac', 'vorbis', 'theora', 'pcm', 'pcm-u8', 'pcm-s16le', 'pcm-f32le'
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+]);
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+
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+const PROHIBITED_WASM_CODECS = ['h264', 'avc', 'hevc', 'h265', 'ac3', 'eac3', 'dts'];
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+
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+function scanDirectory(dirPath) {
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+ let errors = [];
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+ const entries = fs.readdirSync(dirPath, { withFileTypes: true });
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+
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+ for (const entry of entries) {
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+ const fullPath = path.join(dirPath, entry.name);
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+
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+ if (entry.isDirectory()) {
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+ if (entry.name !== 'node_modules' && entry.name !== 'dist' && entry.name !== '.git') {
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+ errors = errors.concat(scanDirectory(fullPath));
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+ }
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+ } else if (entry.isFile()) {
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+ const lowerName = entry.name.toLowerCase();
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+
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+ // Check WASM files
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+ if (lowerName.endsWith('.wasm')) {
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+ let isAllowed = false;
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+ for (const allowed of ROYALTY_FREE_ALLOWLIST) {
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+ if (lowerName.includes(allowed)) {
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+ isAllowed = true;
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+ break;
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+ }
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+ }
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+ if (!isAllowed) {
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+ errors.push(`[LICENSING FAILURE] Disallowed WASM binary found: ${fullPath}. Only royalty-free decoders (${[...ROYALTY_FREE_ALLOWLIST].join(', ')}) are permitted as WASM.`);
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+ }
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+ }
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+
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+ // Check JS/TS files in packages/codecs/software for prohibited patent pool software implementations
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+ if ((lowerName.endsWith('.ts') || lowerName.endsWith('.js')) && fullPath.includes('packages/codecs/src/software')) {
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+ const content = fs.readFileSync(fullPath, 'utf8').toLowerCase();
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+ for (const prohibited of PROHIBITED_WASM_CODECS) {
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+ if (content.includes(`software_${prohibited}_decoder`) || content.includes(`wasm_${prohibited}`)) {
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+ errors.push(`[LICENSING FAILURE] Software/WASM decoder logic for patented codec '${prohibited}' detected in ${fullPath}. Software decoding of patented codecs is strictly forbidden by policy.`);
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+ }
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+ }
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+ }
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+ }
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+ }
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+
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+ return errors;
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+}
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+
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+const packagesDir = path.join(rootDir, 'packages');
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+console.log('Running media-runtime Codec Licensing Audit...');
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+const errors = scanDirectory(packagesDir);
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+
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+if (errors.length > 0) {
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+ console.error('\n=== LICENSING CHECK FAILED ===');
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+ errors.forEach(err => console.error(err));
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+ process.exit(1);
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+} else {
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+ console.log('✅ Licensing Audit Passed: All decoders comply with LICENSING.md royalty-free & hardware-first policy.');
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+}
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▼scripts/size-limit.js
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+import fs from 'node:fs';
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+import path from 'node:path';
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+import zlib from 'node:zlib';
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+import { fileURLToPath } from 'node:url';
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+
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+const __filename = fileURLToPath(import.meta.url);
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+const __dirname = path.dirname(__filename);
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+const rootDir = path.resolve(__dirname, '..');
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+
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+const BUDGETS = [
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+ { package: 'core', maxSizeKb: 150 },
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+ { package: 'stream', maxSizeKb: 30 },
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+ { package: 'buffer', maxSizeKb: 20 },
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+ { package: 'containers', maxSizeKb: 50 },
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+ { package: 'manifest', maxSizeKb: 40 },
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+ { package: 'abr', maxSizeKb: 20 },
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+ { package: 'codecs', maxSizeKb: 30 },
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+ { package: 'drm', maxSizeKb: 15 },
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+ { package: 'renderer', maxSizeKb: 40 },
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+ { package: 'audio', maxSizeKb: 25 },
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+ { package: 'subtitle', maxSizeKb: 35 },
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+ { package: 'worker', maxSizeKb: 20 },
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+ { package: 'scheduler', maxSizeKb: 25 },
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+ { package: 'os-integration', maxSizeKb: 20 },
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+ { package: 'telemetry', maxSizeKb: 15 },
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+ { package: 'security', maxSizeKb: 20 },
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+ { package: 'plugins', maxSizeKb: 15 },
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+ { package: 'ui', maxSizeKb: 45 },
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+ { package: 'utils', maxSizeKb: 25 }
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+];
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+
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+console.log('Running Bundle Size Budget Audit...\n');
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+let failed = false;
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+
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+for (const item of BUDGETS) {
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+ const pkgDistPath = path.join(rootDir, 'packages', item.package, 'dist');
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+ let totalBytes = 0;
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+
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+ if (fs.existsSync(pkgDistPath)) {
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+ const files = fs.readdirSync(pkgDistPath).filter(f => f.endsWith('.js') || f.endsWith('.mjs'));
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+ for (const file of files) {
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+ const filePath = path.join(pkgDistPath, file);
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+ const content = fs.readFileSync(filePath);
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+ const gzipped = zlib.gzipSync(content);
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+ totalBytes += gzipped.length;
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+ }
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+ } else {
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+ // Estimate based on src if dist not yet built
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+ const srcPath = path.join(rootDir, 'packages', item.package, 'src');
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+ if (fs.existsSync(srcPath)) {
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+ const getFiles = (dir) => {
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+ let results = [];
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+ const list = fs.readdirSync(dir, { withFileTypes: true });
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+ for (const file of list) {
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+ const res = path.resolve(dir, file.name);
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+ if (file.isDirectory()) {
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+ results = results.concat(getFiles(res));
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+ } else if (file.name.endsWith('.ts')) {
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+ results.push(res);
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+ }
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+ }
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+ return results;
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+ };
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+ const files = getFiles(srcPath);
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+ for (const file of files) {
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+ const content = fs.readFileSync(file);
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+ const gzipped = zlib.gzipSync(content);
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+ totalBytes += Math.floor(gzipped.length * 0.4); // compressed JS estimate
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+ }
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+ }
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+ }
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+
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+ const sizeKb = (totalBytes / 1024).toFixed(2);
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+ const status = totalBytes <= item.maxSizeKb * 1024 ? '✅ PASS' : '❌ FAIL';
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+ if (totalBytes > item.maxSizeKb * 1024) failed = true;
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+
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+ console.log(`${status} @media-runtime/${item.package.padEnd(16)} Size: ${sizeKb.padStart(6)} KB (Max Budget: ${item.maxSizeKb} KB gzipped)`);
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+}
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+
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+if (failed) {
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+ console.error('\n❌ Bundle size budget exceeded!');
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+ process.exit(1);
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+} else {
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+ console.log('\n✅ All packages within gzipped size budgets.');
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+}
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▼scripts/test-runner.js
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+import test from 'node:test';
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+import assert from 'node:assert/strict';
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+
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+import { BitStreamReader, RingBuffer } from '../packages/utils/dist/index.js';
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+import { Player } from '../packages/core/dist/index.js';
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+import { PluginRegistry } from '../packages/plugins/dist/index.js';
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+import { HTTPRangeSource } from '../packages/stream/dist/index.js';
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+import { BufferController } from '../packages/buffer/dist/index.js';
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+import { HLSParser, DASHParser } from '../packages/manifest/dist/index.js';
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+import { ABRController } from '../packages/abr/dist/index.js';
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+import { MP4Demuxer, FLVDemuxer, TSDemuxer, ContainerRegistry } from '../packages/containers/dist/index.js';
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+import { CodecNegotiator } from '../packages/codecs/dist/index.js';
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+import { SRTParser, ASSParser } from '../packages/subtitle/dist/index.js';
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+import { FuzzTarget } from '../packages/security/dist/index.js';
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+
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+test('Utils: BitStreamReader & RingBuffer', () => {
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+ const data = new Uint8Array([0x12, 0x34, 0x56, 0x78]);
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+ const reader = new BitStreamReader(data);
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+ assert.equal(reader.readUint16BE(), 0x1234);
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+ assert.equal(reader.readUint16BE(), 0x5678);
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+
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+ const ring = new RingBuffer(16);
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+ assert.equal(ring.write(new Uint8Array([1, 2, 3, 4])), 4);
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+ const out = new Uint8Array(4);
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+ assert.equal(ring.read(out), 4);
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+ assert.deepEqual(Array.from(out), [1, 2, 3, 4]);
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+});
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+
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+test('Core: Player state lifecycle and clock', () => {
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+ const player = new Player();
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+ assert.equal(player.getState(), 'idle');
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+ player.play();
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+ assert.equal(player.getState(), 'playing');
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+ player.pause();
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+ assert.equal(player.getState(), 'paused');
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+ player.seek(15.5);
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+ assert.equal(player.getCurrentTime(), 15.5);
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+});
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+
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+test('Plugins: Plugin registration and event dispatching', async () => {
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+ const registry = new PluginRegistry();
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+ let eventReceived = false;
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+ await registry.register({
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+ name: 'test-plugin',
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+ category: 'telemetry',
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+ version: '1.0.0',
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+ init() {},
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+ onEvent(evt) {
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+ if (evt === 'test-evt') eventReceived = true;
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+ }
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+ });
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+
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+ registry.dispatchEvent('test-evt');
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+ assert.equal(eventReceived, true);
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+});
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+
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+test('Containers: Demuxer probing & demuxing', () => {
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+ const registry = new ContainerRegistry();
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+ const mp4Data = new Uint8Array([0x00, 0x00, 0x00, 0x14, 0x66, 0x74, 0x79, 0x70]);
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+ const res = registry.autoDemux(mp4Data);
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+ assert.ok(res.tracks.length > 0);
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+
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+ const flv = new FLVDemuxer();
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+ assert.equal(flv.probe(new Uint8Array([0x46, 0x4C, 0x56])), true);
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+});
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+
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+test('Manifest: HLS & DASH parsing', () => {
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+ const hls = `#EXTM3U
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+#EXT-X-STREAM-INF:BANDWIDTH=2000000,RESOLUTION=1280x720,CODECS="avc1.4d401f"
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+http://example.com/stream.m3u8`;
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+ const playlist = HLSParser.parse(hls, 'http://example.com/master.m3u8');
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+ assert.equal(playlist.renditions.length, 1);
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+ assert.equal(playlist.renditions[0].bandwidth, 2000000);
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+});
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+
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+test('Codecs: Capability negotiation', async () => {
77
+ const cap = await CodecNegotiator.negotiateVideo('avc1.4d401f');
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+ assert.equal(cap.supported, true);
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+});
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+
81
+test('Subtitle: SRT and ASS subtitle parsers', () => {
82
+ const srt = `1\n00:00:01,000 --> 00:00:04,000\nHello World`;
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+ const packets = SRTParser.parse(srt);
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+ assert.equal(packets.length, 1);
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+ assert.equal(packets[0].text, 'Hello World');
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+ assert.equal(packets[0].startTime, 1);
87
+});
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+
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+test('Security: Container parser fuzz target', () => {
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+ const demuxer = new MP4Demuxer();
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+ const sample = new Uint8Array([0x00, 0x00, 0x00, 0x14, 0x66, 0x74, 0x79, 0x70]);
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+ const res = FuzzTarget.run(demuxer, sample, 20);
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+ assert.equal(res.iterations, 20);
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+ assert.equal(res.crashes, 0);
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+});
0
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