| (function(){ |
| if( navigator.userAgent.toLowerCase().indexOf('edge') === -1 |
| && navigator.userAgent.toLowerCase().indexOf('chrome') > -1){ |
| |
| if ( ( /chrome\/([0-9]*)\./.exec( navigator.userAgent.toLowerCase() )[1] | 0 ) < 54 ) { |
| |
| // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=622956 |
| // Chrome does not fire the empty keystatuschange event when a session is closed |
| var _mediaKeySessionClose = MediaKeySession.prototype.close; |
| var _mediaKeySessionKeyStatusesGetter = Object.getOwnPropertyDescriptor( MediaKeySession.prototype, 'keyStatuses' ).get; |
| var _emptyMediaKeyStatusMap = { size: 0, |
| has: function() { return false; }, |
| get: function() { return undefined; }, |
| entries:function() { return []; }, // this may not be correct, I think it should be some iterator thing |
| keys: function() { return []; }, |
| values: function() { return []; }, |
| forEach:function() { return; } }; |
| |
| MediaKeySession.prototype.close = function close() |
| { |
| this.__closed = true; |
| |
| setTimeout( function() { |
| this.dispatchEvent( new Event( 'keystatuseschange' ) ); |
| }.bind( this ), 0 ); |
| |
| return _mediaKeySessionClose.call( this ); |
| }; |
| |
| Object.defineProperty( MediaKeySession.prototype, 'keyStatuses', { get: function() { |
| |
| return this.__closed ? _emptyMediaKeyStatusMap : _mediaKeySessionKeyStatusesGetter.call( this ); |
| |
| } } ); |
| } |
| } |
| }()); |
