1 files changed, 59 insertions, 0 deletions
diff --git a/third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCDisplayLinkTimer.m b/third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCDisplayLinkTimer.m
new file mode 100644
index 0000000000..906bb898d6
--- /dev/null
+++ b/third_party/libwebrtc/sdk/objc/components/renderer/opengl/RTCDisplayLinkTimer.m
@@ -0,0 +1,59 @@
+/*
+ *  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 "RTCDisplayLinkTimer.h"
+
+#import <UIKit/UIKit.h>
+
+@implementation RTCDisplayLinkTimer {
+  CADisplayLink *_displayLink;
+  void (^_timerHandler)(void);
+}
+
+- (instancetype)initWithTimerHandler:(void (^)(void))timerHandler {
+  NSParameterAssert(timerHandler);
+  if (self = [super init]) {
+    _timerHandler = timerHandler;
+    _displayLink =
+        [CADisplayLink displayLinkWithTarget:self
+                                    selector:@selector(displayLinkDidFire:)];
+    _displayLink.paused = YES;
+#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_10_0
+    _displayLink.preferredFramesPerSecond = 30;
+#else
+    [_displayLink setFrameInterval:2];
+#endif
+    [_displayLink addToRunLoop:[NSRunLoop currentRunLoop]
+                       forMode:NSRunLoopCommonModes];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [self invalidate];
+}
+
+- (BOOL)isPaused {
+  return _displayLink.paused;
+}
+
+- (void)setIsPaused:(BOOL)isPaused {
+  _displayLink.paused = isPaused;
+}
+
+- (void)invalidate {
+  [_displayLink invalidate];
+}
+
+- (void)displayLinkDidFire:(CADisplayLink *)displayLink {
+  _timerHandler();
+}
+
+@end