1 /* 2 * Copyright (c) 2018 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 MODULES_VIDEO_CODING_UTILITY_FRAMERATE_CONTROLLER_H_ 12 #define MODULES_VIDEO_CODING_UTILITY_FRAMERATE_CONTROLLER_H_ 13 14 #include <stdint.h> 15 16 #include "absl/types/optional.h" 17 #include "rtc_base/rate_statistics.h" 18 19 namespace webrtc { 20 21 class FramerateController { 22 public: 23 explicit FramerateController(float target_framerate_fps); 24 25 void SetTargetRate(float target_framerate_fps); 26 float GetTargetRate(); 27 28 // Advices user to drop next frame in order to reach target framerate. 29 bool DropFrame(uint32_t timestamp_ms) const; 30 31 void AddFrame(uint32_t timestamp_ms); 32 33 void Reset(); 34 35 private: 36 absl::optional<float> Rate(uint32_t timestamp_ms) const; 37 38 absl::optional<float> target_framerate_fps_; 39 absl::optional<uint32_t> last_timestamp_ms_; 40 uint32_t min_frame_interval_ms_; 41 RateStatistics framerate_estimator_; 42 }; 43 44 } // namespace webrtc 45 46 #endif // MODULES_VIDEO_CODING_UTILITY_FRAMERATE_CONTROLLER_H_ 47