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(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 ) {
// 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 );
} } );
}
}
}());