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.device.DeviceFactory');
  10. goog.require('shaka.polyfill');
  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.     const device = shaka.device.DeviceFactory.getDevice();
  32.     if (!device.supportsEncryptionSchemePolyfill()) {
  33.       return;
  34.     }
  36.     EncryptionSchemePolyfills.install();
  37.   }
  38. };
  40. // Install at a low priority so that other EME polyfills go first.
  41. shaka.polyfill.register(shaka.polyfill.EncryptionScheme.install, -2);