EME & MediaCapabilities Encryption Scheme Polyfill

A polyfill to add support for EncryptionScheme queries in EME and MediaCapabilities.

• https://wicg.github.io/encrypted-media-encryption-scheme/
• https://google.github.io/eme-encryption-scheme-polyfill/demo/
• WICG/encrypted-media-encryption-scheme#13
• w3c/media-capabilities#100

Because this polyfill can't know what schemes the UA or CDM actually support, it assumes support for the historically-supported schemes of each well-known key system.

In source form (index.js), this is compatible with the Closure Compiler and the CommonJS module format. It can also be directly included via a script tag.

The minified bundle (dist/eme-encryption-scheme-polyfill.js) is a standalone module compatible with the CommonJS and AMD module formats, and can also be directly included via a script tag. It is about 4.4kB uncompressed, and gzips to about 1.5kB.

To avoid the possibility of extra user prompts, this will shim EME & MC so long as they exist, without checking support for encryptionScheme upfront. The support check will happen on-demand the first time EME/MC are used.

Usage

npm install eme-encryption-scheme-polyfill

<script src="node_modules/eme-encryption-scheme-polyfill/dist/eme-encryption-scheme-polyfill.js"></script>

// Install both EME & MC polyfills at once:
EncryptionSchemePolyfills.install();

// Install each one separately (unminified source only):
EmeEncryptionSchemePolyfill.install();
McEncryptionSchemePolyfill.install();