1 /* 2 * Copyright 2021 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef COMMON_VIDEO_FRAMERATE_CONTROLLER_H_ 12 #define COMMON_VIDEO_FRAMERATE_CONTROLLER_H_ 13 14 #include <stdint.h> 15 16 #include "absl/types/optional.h" 17 18 namespace webrtc { 19 20 // Determines which frames that should be dropped based on input framerate and 21 // requested framerate. 22 class FramerateController { 23 public: 24 FramerateController(); 25 explicit FramerateController(double max_framerate); 26 ~FramerateController(); 27 28 // Sets max framerate (default is maxdouble). 29 void SetMaxFramerate(double max_framerate); 30 double GetMaxFramerate() const; 31 32 // Returns true if the frame should be dropped, false otherwise. 33 bool ShouldDropFrame(int64_t in_timestamp_ns); 34 35 void Reset(); 36 37 void KeepFrame(int64_t in_timestamp_ns); 38 39 private: 40 double max_framerate_; 41 absl::optional<int64_t> next_frame_timestamp_ns_; 42 }; 43 44 } // namespace webrtc 45 46 #endif // COMMON_VIDEO_FRAMERATE_CONTROLLER_H_ 47