text: /*
   *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #import <Foundation/Foundation.h>
  
  // RTCDisplayLinkTimer wraps a CADisplayLink and is set to fire every two screen
  // refreshes, which should be 30fps. We wrap the display link in order to avoid
  // a retain cycle since CADisplayLink takes a strong reference onto its target.
  // The timer is paused by default.
  @interface RTCDisplayLinkTimer : NSObject
  
  @property(nonatomic) BOOL isPaused;
  
  - (instancetype)initWithTimerHandler:(void (^)(void))timerHandler;
  - (void)invalidate;
  
  @end
  