eme-encryption-scheme-polyfill

EME Encryption Scheme Polyfill

A polyfill to add support for EncryptionScheme queries in EME.

• https://wicg.github.io/encrypted-media-encryption-scheme/
• https://google.github.io/eme-encryption-scheme-polyfill/demo/
• https://github.com/WICG/encrypted-media-encryption-scheme/issues/13

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 3.1kB uncompressed, and gzips to about 1.2kB.

To avoid the possibility of extra user prompts, this will shim EME so long as it exists, without checking support for encryptionScheme upfront. The support check will happen on-demand the first time EME is used.

Usage

npm install eme-encryption-scheme-polyfill

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

EmeEncryptionSchemePolyfill.install();

Changelog

1.0.2 (2019-12-02)

Bugfixes:

• Fix infinite recursion when the polyfill is installed twice.