Source: lib/polyfill/encryption_scheme.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  7. goog.provide('shaka.polyfill.EncryptionScheme');
  9. goog.require('shaka.polyfill');
  10. goog.require('shaka.util.Platform');
  12. /**
  13.  * @summary A polyfill to add support for EncryptionScheme queries in EME.
  14.  * @see https://wicg.github.io/encrypted-media-encryption-scheme/
  15.  * @see https://github.com/w3c/encrypted-media/pull/457
  16.  * @see https://github.com/shaka-project/eme-encryption-scheme-polyfill
  17.  * @export
  18.  */
  19. shaka.polyfill.EncryptionScheme = class {
  20.   /**
  21.    * Install the polyfill if needed.
  22.    *
  23.    * @suppress {missingRequire}
  24.    * @export
  25.    */
  26.   static install() {
  27.     // Skip polyfill for PlayStation 4 and SkyQ devices due to known crashes
  28.     // caused by unsupported encryptionScheme handling. These platforms do not
  29.     // require the polyfill, and forcing encryptionScheme processing can result
  30.     // in playback crashes.
  31.     if (shaka.util.Platform.isPS4() || shaka.util.Platform.isSkyQ()) {
  32.       return;
  33.     }
  35.     EncryptionSchemePolyfills.install();
  36.   }
  37. };
  39. // Install at a low priority so that other EME polyfills go first.
  40. shaka.polyfill.register(shaka.polyfill.EncryptionScheme.install, -2);